chengcg – Page 195 – CNC Machining & Turning, Milling, Metal parts

Process method of drawing pulley for aluminum workpiece

Wire drawing process for grinding wire drawing wheel refers to machining straight lines on the surface of parts by means of machine friction. Aesthetics has no standard and is very subjective. The utility model has the dual functions of removing the scratch on the surface of the parts and decorating the surface of the parts. Straight wire drawing process has two kinds: continuous filament and interrupted yarn. The continuous thread can be obtained by a continuous horizontal linear friction on the surface of the part (such as hand grind under the condition of the present device or the brush of a steel wire with a planer in the condition of a present device). Changing the diameter of the stainless steel brush can get different grain sizes. Interrupted silk pattern is usually made on brushing machine or rubbing machine. Production principle: two groups of rotating differential wheels are used, the upper group is a fast rotating grinding roller, the lower group is a slow rotating roll, and the aluminum or aluminum alloy plate passes through the two groups of roller wheels and is brushed out with fine and intermittent straight lines.
Undefined

Before bending and so on, the drawing wheel is generally a flat drawing process which has a high requirement for the front treatment of the base material, otherwise it will amplify the defect of the base material after the appearance is disposed. At present, there is no evaluation method and standard for drawing aesthetics in the industry, and some customers use roughness measurement to judge.

Now, the appearance of aluminum alloy products is not electroplating, some customers use the microscope to enlarge the observation of drawing process effect. The drawing wheel can only be used as an auxiliary means. After all, the drawing process is a macroscopic overall effect, not the micro effect. It’s a variety of colors that are oxidized. Anodizing has heard that Han Tong lapping against aluminum materials is mainly to strengthen its surface hardness (a layer of ceramic) to enhance its friction resistance. Hot stamping is also a kind of heat transfer. Die casting aluminum parts can be treated by wire drawing process, and then a layer of protective film is sprayed to prevent oxidation. The die casting, of course, can also be treated with surface oxidation. The appearance of a dumb light can be done, but the effect of the grinding is a prophase process of oxidation disposal through the sand blasting process.

What are the uses and technological characteristics of six angle plug plugs?

Application scope and application: engineering machinery, metallurgical machinery, petroleum, chemical, pharmaceutical, ship port equipment, water conservancy project and other mechanical equipment hydraulic system.
The technological characteristics and practical value of the plugging product:
1. the product is processed by numerical control to ensure that the product difference is within 0.05mm, which ensures the depth of the inner groove and the difference between the thread and the bottom plane.
2. the special process such as quenching and tempering products can meet the requirements of hardness, eliminate screw damage and tighten fastening strength.
3. inner six corner extrusion production, ensure six corners do not damage hair and smooth without rust.

Attitude is a brand

Now, when processing compensators, many manufacturers are proud of the small quantity of customers’ demand. In fact, they do not understand that they are all small. In fact, they do not understand that the attitude is a brand, no matter how large or small we are, and we have always taken this as a brand forever.

The use of each wax

Use: This product is used in the rough grinding process, suitable for aluminum alloy, stainless steel, copper, aluminum and other polishing, such as tableware, fishing gear accessories, all kinds of hardware, the main function is to remove the trachoma, burr and so on to smooth the rough surface leveling to achieve smooth effect.
Features: medium and coarse abrasive, strong cutting force, rich oil and versatility.
Usage: 1. Polishing rough surface (such as tableware stamping surface, machined surface after machine machining, etc.), can be used with grinding wheel and flax wheel to lubricate cutting function, manual semi-automatic or mechanical polishing can be used. 2, low roughness surface, can be polished with the cloth wheel.
Purple polished wax No. 1 (90P, medium fine grinding) (06105)
Usage: This product is suitable for 200, 300 series decorative tube, stainless steel pot, kitchen utensils, etc.
Features: general cutting force, good light performance and suitable oil.
Usage: 1. The middle way (linen and cloth wheel) used for cooking utensils and kitchen utensils is cut and polished, and used for polishing and polishing of decorative tubes. 2. According to the surface condition and requirements of the material, it can be polished with flax wheel, hard cloth wheel, soft cloth wheel, such as 1~3 polishing wheels, hard cloth wheel in the middle, and the last two soft cloth wheel for polishing wheel. 3. Wax on the pulley and the hard cloth wheel.
Purple polished wax No. 2 (90P, medium fine grinding) (06106)
Usage: This product is aimed at polishing 200 and 300 series decorative square tubes and round pipes, and the product performance is inferior to purple polishing wax (06105).
Characteristics: more targeted, cutting force in general, good light performance, grease suitable.
Usage: according to the surface condition and requirements of the material, it can be polished with linen wheel, hard cloth wheel, soft cloth wheel, such as 1~3 polishing wheels, hard cloth wheel in the middle, and the last two soft cloth wheel for polishing wheel. Wax on a pulley and a hard cloth wheel
White polished wax No. 1 (90w1, medium mill) (06103)
Use: This product is used in the middle stage polishing process. It is especially suitable for polishing 316, 321, 304 and other stainless steel hard metal materials. It is suitable for shallower surface polishing, such as sand eyes, sand lines, tensile marks, etc., such as chemical equipment, hardware and all kinds of accessories made by 2B steel. Features: cutting force and luster performance are excellent, cutting force is lower than white polishing wax (06104), gloss is clear and bright, grease is rich, versatility.
Usage: 1. For the surface with trachoma or oxide layer, it can be polished with 100 rounds of wheels and matched with cloth or felt wheel to polish the product. For lower rough surface, such as 2B thick plate can be polished with this product directly with this product, and the speed of polishing wheel is recommended for 2600/ minute white polishing wax 2 (90w2, 06104).
Use: This product is used in the middle stage polishing process, especially for 316, 321, 420, 430 and other series of stainless steel, stainless steel hard metal material polishing, such as tableware, car wheel, chemical equipment and so on.
Features: excellent cutting force, high polishing efficiency, large cutting volume, high oil content and clear luster.
Usage: the surface of the workpiece with large roughness is coarsely polished by red polishing wax, and this product can be polished with cloth wheel or manually or mechanically polished. If the surface of the workpiece is smoother, it can be polished directly without polishing with red polishing wax. It is suggested that the rotation speed of the polishing wheel is 2400 to 2600/ minutes
Wax / iron wax: use: This product is used in the rough grinding process. It is suitable for polishing stainless steel, tableware and casting. The main function is to remove the rough surface and get smooth effect by removing the trachoma, burr and so on.
Characteristics: medium coarse abrasive, cutting force is better than yellow polishing wax, rich in fat and versatility.
Usage: 1. Polishing rough surface (such as tableware stamping surface, machined surface after machine machining, etc.), can be used with grinding wheel and flax wheel to lubricate cutting function, manual semi-automatic or mechanical polishing can be used. Low roughness surface, can be polished with a cloth wheel.
Green polishing wax No. 1 (80G1, fine polishing) (06107)
Usage: This product is used for polishing and polishing after the sequence. It is suitable for fine polishing of all kinds of stainless steel, copper, aluminum, precious metals and precision instruments.
Features: deep specular luster, glossy blue color, deep fat, suitable oil, less residual after polishing, polishing without grind.
Usage: This product belongs to the finish polishing product, it must be polished through white polishing wax, and the workpiece surface reaches a certain low rough value and uses this product. It is a bright polishing product. With the use of cotton wheel, felt wheel and other soft polishing wheels, the speed of the polishing wheel is recommended 2800 R / min or higher.
Green polished wax No. 2 (80G2, fine polished) (06108)
Use: This product is used for polishing of light finishing in post order. It is suitable for fine polishing of all kinds of stainless steel, copper, aluminum, precious metal and precision instrument. The effect is second to green polishing wax (06107).
Features: Mirror green, glossy, good cutting force, clear and bright gloss, suitable oil and good price.
Usage: This product belongs to the finish polishing product, it must be polished through white polishing wax, and the workpiece surface reaches a certain low rough value and uses this product. It is a bright polishing product. The use of soft polishing wheels, such as cotton cloth wheel and felt wheel, etc.

Purple wax: special products of stainless steel, made of rosin, Vaseline, paraffin, Zong Gangyu powder or grinding power, aluminum oxide powder and iron oxide red. The main components are brown corundum powder or aluminum oxide powder. It is suitable for intermediate grinding of any metal or non-metal parts.
Black wax: special for iron products
Yellow wax: aluminum products are specially made from hardened oil, Vaseline, rosin, quartz powder and iron oxide yellow. The main ingredient is feldspar. Apply to gold

What should we do and how can we achieve network marketing?

The most fundamental problems in operation should be: flow, dynamic sales (transformation), cost and profit.
The most fundamental is: market industry, customers, competitors.
First flow: where is the customer? How can we let customers know that we have good quality and inexpensive products? The initial flow is very important.
Second move pin: will customers buy when customers come? How much will they buy and how much is the unit price? Can the high conversion rate be formed?
Third cost: how much cost will we pay from the purchase of goods to the end of the consumer? There is no way we can try to reduce the cost as much as possible.
Since you are going to go to the operation in the future, I need to remind you here that you must not be smart enough to reduce costs, that is to say, low cost does not mean the low quality of the goods.
Fourth profit: This is the ultimate goal of the business, hard for a while, how many of our profits, it is Lei Feng or Ma Yun to work, the heart must have a bottom. It is necessary to point out that, in the current state, there are too many electric businesses to learn Lei Feng. After you go to work, especially in practice, we must pay attention to the cost control and maximize the profit.
The practice of practice
The above talks about some basic points of operation, and we all know something about it. In the end, how can we improve our operational skills by doing business?
1. Insist on learning.
Ma Yun knows everything about Taobao. It seems that Ma Yun is a God. But you see, God loves learning. However, what people learn is different from ours. They visited Li and Wang Lin, a qigong master. The realm is different. After all, the level is there. But we are different. We are too far away, so we can only learn to improve our vocational skills through learning from the people around us and learning from the Internet.
There is a saying: because the long ones are not high enough, they can only tread the past under their feet. In other words, we should continue to learn and accumulate.
Two, more practice and more summary.
As long as you do e-commerce, you will have a lot of things to do every day. The title should be optimized and the poster is made. It is a discount and a suitable discount tool. By the way, look at what performance of your products are in the search, and see what is worth learning by the competitors, especially the competition. Therefore, you are sure to be very busy, busy, have experience, know how to choose the selection, know what the main product should use, and know what should be paid attention to when the title is optimized. All you need is practice, but light practice is not enough. You want to think that operation is not a person to do, but a team is doing, even if you open a small shop, do you also need to sum up, see which do well, which is not enough, especially when the team, there is a summary, there is a summary. It will let the team take a lot less curve.
The fastest way for a person to grow is to sum up and think, and to think in practice.

Mold forming steps needed to be known to the mold

The mold is mainly composed of three parts: gating system, forming parts and structural parts. The specifications and uses of the mold are different, and there are many methods for molding the mold, including injection molding, compression molding, extrusion molding, press injection molding and hollow molding. Now let’s learn about the ten steps of mold forming.
1. when the molding tool is used, the CNC punch press is strictly prohibited from sheet stamping and can not be made empty. At the same time, it is necessary to check the tightness of the locking screw, otherwise it will cause the damage of the CNC punch press and the molding die easily.
2. the forming direction of the forming die should be chosen to form upwards so as to avoid the collision between the shape after forming and the steel ball on the worktable resulting in the deformation of the product.
3. the closed height and stamping stroke of each CNC punch press are different, so each mold must be adjusted to the shortest when used for the first time. At the same time, it should not be used directly on another punch. It needs to be reused after a high degree of fine tuning to avoid damage to the machine tool and mould.
The lower die of the 4. up mold is usually higher than the standard mold, so the punching die next to the mold is not used as much as possible to avoid the indentation of the plate. When the molding die is not used, please remove the oil from the machine tool and store the mould cabinet, so as to prevent the rust and dust from the die damage.
5. the full molding of mold needs to be adjusted by micro distance. The operator must be patient and careful in this process. The way of fine tuning is:
The punch stroke of A. CNC punching machine can not be adjusted, and it can only adjust the height of the mold blow head assembly.
The punching stroke of B. CNC punching machine can be adjusted. Only when programming, can the machine parameters be modified to meet the requirements.
C. adjust the height of the mold blow head assembly when the distance is adjusted.
6. for high forming or unconventional moulds, please do a good job of double side lubrication of the plate to strengthen the flow of the plate in the molding and reduce the chance of the plate breaking.
7. in the process of molding, the programming must be used by the molding process program, the sufficient discharging time is reserved when programming, and the speed of the punching machine is put to the slowest, low speed impact, so that the material after the molding is separated from the mold enough to avoid the deviation of the sheet deformation and the forming position.
8. the position of sheet metal forming is far away from the clamp and punching parts. The forming of sheet metal is finished as far as possible in the stamping process.
9. the use of other molds around the high molding dies, or the continuous processing of standard punching dies will cause deformation of the sheet metal.
10. the high molding die has the phenomenon that the plate has scratches and collisions, and the auxiliary transition of the lower die on the two sides of the mold can avoid this problem.
Hubei Sheng has been concentrating on the technical innovation and product development of all kinds of precision mold parts, automation equipment parts and parts. The experience of the industry has been accumulated, and the core technology of the research and development, design and manufacturing of the parts and parts of the precision mold and automation equipment has been successfully mastered. In the field of mold parts and parts with rich research and development experience and strong scientific and technological innovation ability, professional production of hot stream, top needle, tube, insert, guide column, guide sleeve, convex and concave mold, spring, fixture, auto parts and other die parts and other mold parts.

Hardware accessories

Mould accessories: hardware accessories
Hardware accessories refer to machine parts or components made of hardware, and some hardware products. Most of the hardware products are not the final consumer goods, but as the supporting products of industrial manufacturing (mould, machinery, mechanical and electrical), semi-finished products and tools used in the production process and so on. Another small part of daily hardware products (accessories) is a tool consumer product that people must live in.
Hardware accessories: handle, door and window, home decoration, plumbing, building, decoration, tools, bathroom, kitchen, household appliances.

Furniture hardware accessories: wooden screws, hinge, handle, slipway, partition pin, hanger, nail, head machine, tooth grinding machine, multi station machine.
Cupboard hardware accessories: hinges, drawers, guideway, steel drawing, basket, pylon, sink, basket, lamp, kicking board, knife and fork plate, hanger hanger, multi-function column, cabinet body combiner
Mold parts hardware accessories: punching needle, punch, guide column, guide sleeve, head pin, head pin, tube, ball sleeve, ball sleeve, cage, external guide column, independent guide column, self lubricating plate, self lubricating guide sleeve, no oil guide sleeve, no oil slide plate, external guide column module.

Marine hardware accessories: shackles, flower orchids, card heads, swivel rings, rings, pulleys, cable bolts, pipe seats, cable guides and ship strings.
Clothing hardware accessories: buttons, thread buckle, hook, claw nail, rope buckle, pin buckle, army buckle, zipper head, five claw knob, fashion button, bundle ring, diurnal buckle, drop glue buckle, inlaid buckle, latch head, belt buckle, hollow nail, alloy pair buckle, alloy pull card.
Bags and hardware accessories: rivets, aluminum strips, chains, steel rings, buttons, square rings, four buckles, mushroom studs, hollow nails, wire rings, backpack shelves, triangular rings, five corners, three rivets and bags and handbags.
Door and window hardware accessories: handle, hand, hinge, pin, pull hand, hinge, wind brace, pulley, door flower, throat hoop, lock box, bead, crescent lock, multi point lock, actuators, pullers, door closer, glass glue, three star lock
Frame hardware accessories: hooks, shrapnel, blades, drawing, bracing feet, support, press, sheet, corner, straight nail, corner flower, corner machine, nail, nailed, flannelette

Hardware stamping accessories: flat, round, spring, flake, cover, shell, sign, nameplate, marking, iron wire, fork, terminal, stamping part, arm, T plate
Curtain wall hardware accessories: hanging clips, rigging, AB adhesive, barge claw, curtain wall claw, glass claw, barge joint, glass clip, glass glue, mica glue, foam strip, rebar glue, rebar glue, transfer parts, dry hanger, railing handrail, chemical bolt, glass curtain wall, non standard product
General hardware accessories: valves, bearings, springs, pulleys, casters, joints, pipe clips, rollers, unloading buckles, nozzles, hooks, hooks, hooks, balls, balls, hoops, hoops, hoops, rigging, rollers, universal wheels, and oil seals.

30 principles of standardized production of injection moulds

1. less than 2020 of the mold embryo, between a and B boards need to be a pry pit; more than 2020 of the mold embryo, all templates including the thimble boards should be prized.
2 the mold guide sleeve should process the exhaust slot to prevent the guide pin from pulling.
3 die must not have sharp angle, need chamfering treatment. Excepted places are excepted
4 internal mold and mold parts shall not be welded without consent.
5 the periphery of the mold must be opened in the proper position. The specifications of the exhaust manifold refer to the die design manual.
6 as far as possible, avoid using the grinding machine to polish the mold. If you must use the grinding machine, you must use the oil stone (especially the parting surface).
7 the surface treatment of the inner surface of the die must be carried out according to the technical requirements of the BOM form or other official notification. Processing lines on non adhesive surfaces (wire cutting, milling machines, CNC Gong beds, spark machines) also need to be brightly lit.
8 all internal mold materials, mold grading requirements must be purchased according to the order, or the technical requirements formally identified in the design process. Material proof must be provided. If it is a hard mold, heat treatment report must be provided. All relevant certificates.
9 the front and back mould, insert, row position, oblique top, straight top (push block), shovel chicken, etc. need to process a waist round pit at the bottom or side, and engraved the name and hardness of the material.
10 row bits, pushing blocks, shoveling chickens and mouths and other important wear parts must be nitrided and hardened.
The 11 line must have a position. The positioning methods include catapult, wave beads, HASCO (DME) standard position clamp and so on. The row needs to have a pressure strip and a wear-resistant plate. Layering, wear resistant plate must be wear resistant hard material, need to add oil groove.
The 12 row inclined pillar must be tightly pressed, unable to rotate and loose. The tail part of the inclined guide must be processed into hemispherical or conical shape, which is beneficial to ensure normal movement of the row. The length, size and inclination of the slanting guide column must be the same for two or two more inclined columns on the same row.
13 cable-stayed seats must be hardened and hardened. The slanted roof must be processed with an oil tank, and the top seat is usually hardened to hrc40-45 by 2510 or Cr12, because the slanted roof is subjected to the impact load, so it can’t be too hard or it will break, and angle c angle at all right angles. There needs to be a skew guide plate (bronze). No welding.
The 14 channel and the injection position need to save the light #400-600.
15 the thimble, the barrel, the thimble, the oblique top and the thimble plate should be engraved with the corresponding identification code, which is convenient for installation. If the thimble position is not horizontal, the pin seat should be made into a “D” type or an anti pin key.
16 the thimble should adopt HASCO or DME standard, which kind of mould technology requirement determined by BOM table or other formal notice should be chosen.
17 processing water rubber ring (“O” ring) slot, the need for single side reserved 0.25mm clearance, the general rubber ring to prepress the 0.5-0.8mm. if not attached to this point, the apron is easy to be damaged by pressure, causing leakage.
18 nozzles to nitride, need to do stop pin. The radius of the pump must be in accordance with the requirements of the drawing. The nozzle is not nitrided, and it may have been damaged before the mold is moved.
19 conventional structure die must be equipped with supporting head, both ends need to be smoothed, small die prepressing 0.1mm, large die prepressing 0.1mm-0.15mm.
20 the diameter of the locating ring must conform to the drawing, and the form and position of the top bar must conform to the drawing.
21 according to the BOM gauge or the confirmed die diagram, the nozzle must be processed and installed according to the mold drawing. The drilling must not be drilled, and the sharp angle needs to be chamfered.
22 water must be in1, out1, in2, out2… ..
23 all the marks on the mould must be neat, straight and not crooked.
24 mold needs to be installed in the four sides of the side lock (straight lock). If you can not install the side lock, you need to install taper lock or conical lock. The taper lock should be installed horizontally.
25 all screws and mold fittings are required to have standard parts, and screw heads can not be sawn off. The length of effective locking of screws must be sufficient, normally 1.5 or 2.
26 the heat sink must have fillet to avoid scratching wires.
27 the hot mouth ID card is mounted on the side of the mold panel.
28 mold transfer inspection: need to cooperate with the mold engineer according to the “mold check list” acceptance before passing the packaging mold.
29 before moving the mold, it is necessary to carry out the test of water pressure (100Pa or above).
30 the outer surface of mould must be maintained in the manufacturing process to prevent rusting and scratching. Before the mold packing, white or / or colourless rust inhibitor is needed for the internal mold, all the surface of the mold must be cleaned, and then butter.

How to avoid failure of SKF roller bearing when used

The SKF aligning roller bearing has two rows of rollers, a common raceway with spherical outer ring and inner race raceway at an angle at the bearing axis. The center point of the sphere in the raceway of the outer ring is on the bearing axis. Therefore, bearings, self aligning and insensitive shaft relative to the shell, it can, for example, cause the shaft to be misaligned. This will cause the bearing to fail in the process of use. We should avoid such a thing and how to avoid it. Let me tell you all about it.
1. Selection and control of shaft and bearing tolerances: bearing should be flexible and no blockage after pressing. If the rotation is not obvious, it indicates that the shaft size is too large and the tolerance should be reduced. If the shaft is loaded into the shaft, it has a significant sense of “rustle” when rotating with the hand. It may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. So when controlling the tolerance of shaft and bearing, the roundness must also be controlled.
2, the prevention of the assembly of foreign objects: when the bearing is loaded on the rotor, it is very easy to enter the inside of the roller bearing with the iron chips which are produced by the dynamic balance, so it is better to balance the bearings before loading the bearings. The metallurgical quality of the roller bearing material was the main factor affecting the early failure of the rolling bearing. With the progress of Metallurgical Technology (such as vacuum degassing of bearing steel), the quality of raw materials has been improved. The proportion of raw material quality in bearing failure analysis has obviously decreased, but it is still one of the main factors affecting bearing failure. Proper selection is still a factor to be considered in bearing failure analysis.
3, paint rust prevention: the characteristics of lacquer rust is multiple in the sealing type of motor, the motor in the assembly sound is very good, but after some time in the warehouse, the electric motor varies greatly, the dismantled bearing has serious rust phenomenon. Bearing life and manufacturing, assembly, use are closely related, must be done in every link, only in the use of adjustable roller bearings to pay attention to these points of attention, in order to make the bearings in the best running state, thus prolonging the life of the bearing. In order to ensure that the bearing has been running in good condition, regular maintenance and maintenance is necessary, so as to prevent accidents and unexpected, improve production efficiency and save cost. To be engaged in the professional maintenance of bearing, it is necessary to have a standard system operating process, including running state, lubricants, periodic disassembly, noise, temperature, and so on.
Above is the way I tell you to prevent SKF roller bearing from being used, and I hope you can remember it well and prevent it in time.

The bearing is good, you do not assemble it, and it is white

Bearing is used to support the components, is also used to support the axis of rotation parts, bearing types according to friction properties: sliding bearings and rolling bearings; according to the load bearing direction: centripetal bearing, propelled bearing, centripetal thrust bearing, and so on.

1, the assembly of sliding bearing
Sliding bearing is a kind of sliding friction bearing, which is characterized by stable work, low reliability, heavy load and large impact load. According to the different structure forms, it can be divided into integral, split and tile type.
(1) assembly of integral sliding bearing
The integral sliding bearing, commonly known as the shaft sleeve, is also the simplest form of the sliding bearing. It is mainly assembled with the method of pressing and hammering. The special occasion is made of hot loading. Most of the bushes are made of copper or cast iron. The assembly should be carefully assembled with wood hammer or hammer pad. The press is pressed into the press at a large time. No matter how to enter or press in, it is necessary to avoid tilting. After assembling, the oil groove and oil hole should be in the required position.
After the deformation of the bearing, the inner hole should be trimmed. The smaller size can be trimmed by reamers, and the larger ones will be scraped. At the same time, we should pay attention to control the clearance between the shaft and the shaft in the tolerance range. In order to prevent the shaft sleeve working, the positioning pin or riding screw is installed on the contact surface of the shaft sleeve and the box box. As the hardness of the box and sleeve material is different, it is easy to make the drill bit to the side of the soft material. The solution is that the sample is punched with the hard material before drilling, and the two is to use a short drill to increase the steel character of the drill bit.
(2) assembly of split bearing
The split bearing is also called the open bearing. It has the characteristics of simple structure and easy to adjust and disassemble. Two axle bushes are inlaid on the axle bush, and the reasonable gap is adjusted with the gasket at the joint.
Assembly of bearing and bearing
The contact between the upper and lower two bushes and the bore of the bearing must be good. If it is not in accordance with the requirement of the bearing body hole of the thick wall bearing, the back of the axle bush should be scraped and studied, and the two ends of the bearing should be close to the ends of the bearing body. As long as the thin wall tile makes the middle surface of the bearing bush higher than 0.1mm of the middle part of the bearing body, it is not necessary to scrape it.
2. The bearing bush is installed in the bearing body, no displacement is allowed in radial or axial direction. The step on the two ends of the bearing bush is usually used to stop the positioning or positioning pin positioning.
The shaving of the bearing bush
In general, the axle bush is usually used to match the shaft bearing with the shaft bearing. In general, the axle bush is scraped first and then the axle bush is scraped. In order to improve the efficiency, the bearing tile and cover can not be installed when the axle bush is scraped down. At present, when the contact point of the Bush is basically conformed to the requirement, the upper bush and the upper cover are pressed tight, and further correction is made when the Bush is scraped and studied. The contact point of the lower axle bush. The degree of tightness of the shaft can be adjusted with the increase of scraping times by changing the thickness of the gaskets. When the bearing cap is fastened, the shaft can be easily rotated without obvious clearances, and the contact points meet the requirement that the scraper is completed.
Measurement of bearing clearance
The size of the bearing clearance can be adjusted by the shim of the middle face, or by direct shaving and shaving. The bearing clearance is usually measured by the method of pressure lead, taking a few sections of lead wire larger than the bearing gap, placing it on the shaft neck and the middle section, then tightening the nut to compress the middle surface, then screwing down the nut, taking the bearing cover and taking out the compressed lead wire carefully, and taking a section to measure the thickness of the micrometer, according to the average thickness of the lead wire. Know the bearing clearance. The general bearing clearance should be 1.5 -2.5 (mm) of the shaft diameter and smaller gap value when larger diameter. If the shaft diameter is 60mm, the bearing clearance should be between 0.09-0.15mm.
2. The assembly of rolling bearing
Rolling bearing has the advantages of small friction, small axial size, convenient replacement and simple maintenance.
(1) technical requirements for assembly
(1) the end face of the rolling bearing marked code should be installed in the visible direction so that it can be checked in replacement.
2. The radius of the arc at the steps of the axle neck or shell should be smaller than the arc radius corresponding to the bearing.
3. Bearing should not be skewed after assembling on axle and shell hole.
(4) in coaxial two bearings, there must be a shaft movement when the shaft expands with heat.
When assembling rolling bearings, we must strictly prevent dirt from entering the bearings.
After assembling, the bearing must be flexible in operation, low in noise, and the working temperature should not exceed 65 degrees.
(2) assembly method
When assembling the bearing, the basic requirement is to make the axial force added directly on the end face of the bearing ring. (when installed on the shaft, the axial force of the added is directly on the inner ring, and the added force should be directly acted on the outer ring when the hole is installed on the hole). Try not to affect the rolling body. The methods of assembly include hammering, press assembling, hot charging and freezing assembling.
(1) hammering
With the hammer on the purple copper rod and some soft material after the hammer, we should pay attention to not make the copper and other foreign objects fall into the bearing raceway, do not directly use the hammer or the punching cylinder to strike the inner and outer ring of the bearing directly, so as to avoid the bearing coordination precision or cause the bearing damage.
The assembly method of screw press or hydraulic press
For larger bearings with larger interference tolerance, screw presses or hydraulic presses can be used. In front of the press, the shaft and the bearing should be leveled, and a little oil is applied to the bearing. The pressure should not be too fast. The pressure should be removed quickly after the bearing is in place to prevent the bearing or shaft from being damaged.
Thermal loading method
The hot charging method is to heat the bearing in oil to 80 -100 C.