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Key points of quality management system operation of professional die enterprise

The technological process of casting production is mainly divided into four basic parts: casting metal preparation, mold preparation and casting, and casting treatment.
1, metal preparation, mainly metal smelting: metal as the main component (such as iron, aluminum or copper), adding other metal or non-metallic elements (chromium, manganese, vanadium, zinc, phosphorus, silicon, etc.) by heating melting into the specified composition of the molten metal (cast iron, cast steel and cast nonferrous metal).
Metal smelting – making metal molten liquid in temperature, chemical composition, and cleanliness conforms to the expected requirements. In the process of melting, various inspection tests for the purpose of controlling the quality, such as temperature testing, pre furnace chemical analysis, pre furnace treatment (desulfurization, vacuum degassing, refining, inoculation and modification), are required.
Common equipment are cupola, electric arc furnace, resistance furnace, induction furnace, etc.
2, mold preparation: different products, different casting methods have different mold preparation methods; sand mold, metal mold and so on. Commonly used sand casting, mold preparation content includes molding material preparation, core making, sand mixing (to control the composition and humidity of molding sand), and so on. (besides, there are casting designs for casting, riser design, casting system design, technology and model making). The accuracy of casting and the economic effect of the whole production process are mainly determined by this process. In modern production, the molding core has been mechanized or automated. The common equipment is: high and low pressure molding machine, sand throwing machine, core ejection machine, cold and hot core box machine.
In addition, there are also molten mold casting (dewaxing casting), etc.
3, metal casting is usually divided into two kinds of manual and mechanical casting. The production of cast iron is mainly made by hand casting, and the casting is made by lifting the iron water package from the crane to the lifting facility (whether the slag is sufficient before casting, the pouring temperature is suitable), and the non-ferrous metal casting is generally realized by the pressure casting machine. At this time, die casting process parameters, temperature, pressure and time, should be well controlled. All kinds of die casting machines are available in main facilities.
4, casting processing: mainly sand, sand cleaning, pouring riser cleaning, some of the castings have special requirements through heat treatment (such as castings annealing, nodular iron normalizing treatment, etc.), and antirust treatment. The equipment disposed includes sand knocking machine, shot blasting machine, various heat treatment furnace, etc.
In the process of production, the main factors to be concerned are: the temperature of melting, the composition of the molten liquid, and the casting temperature, and the control of the heat treatment process of the castings (heating temperature, heat preservation time, cooling rate).
The process of melting, casting and heat treatment should be controlled as a special process.
Cast iron castings should pay attention to the quality of the burden (coke, pig iron, scrap and nodular agent), especially in the scrap steel.
In addition, the production safety environment requirements: Casting environmental waterproofing, safety inspection of running iron ladle.
Relevant main technical standards:
GB/T 9439-1988 gray iron castings
GB/T 718-2005 cast iron for casting
GB/T 8729-1988 coke for casting
GB/T 11352-2009 cast carbon steel for general engineering
GB/T 1348-2009 spheroidal graphite cast iron
Evaluation method of surface roughness of GB/T 15056-1994 castings
Weight tolerance of GB/T 11351-1989 castings
Casting quality
In general, there are three aspects:
(1) internal quality: it includes casting material quality (chemical composition, metallographic structure, metallurgical defects, physical and mechanical properties).
Internal casting defects such as energy and some special properties).
(2) external quality: generally including casting surface quality (surface roughness, surface hard layer depth and hardness, etc.) and dimensions.
And weight accuracy (dimensional tolerances, geometric tolerances, weight tolerances) and casting defects.
(3) use quality: it includes cutting performance, welding performance and working life.
The cost of casting is an important part of product cost. To reduce the cost of products, we must reduce the cost of casting as far as possible. For a long time, not enough attention has been paid to the quality of castings. In particular, the internal quality and production cost of the castings, many manufacturers are used to the evaluation index of the quality of the castings. In fact, the rate of waste products can not represent the quality of the castings. It can only reflect the technical level and management level of the enterprise, so it can only reflect the technical level and management level of the enterprise. The neglect of internal quality and production cost makes castings less competitive in domestic and foreign markets.
Foundry production process is a complex process with various processes and related factors coming from many aspects. At present, there are some problems, such as low casting quality (especially internal quality), high production cost (low efficiency, high energy consumption) and serious environmental pollution. The reasons for these problems can be summarized as follows:
(“) the casting quality standard is not perfect and not clear. In China’s existing national standards, Ministry standards and technical guidance documents, the quality standards of casting are low and the quality requirements are low. Some of them are made in 60s and 70s. It is urgent to revise and draw close to international standards. Only by improving and strictly implementing the casting quality standards can the quality problems of foundry production in China be solved step by step.
The quality of various raw materials used in casting is low. Without high quality raw materials, it is difficult to produce high quality castings. For example, low sulfur and low phosphorus pig iron, high quality foundry coke is difficult to guarantee supply, casting sand has no unified production management organization, quality can not be guaranteed, other raw materials and auxiliary materials have similar conditions.
(!) the level of management is backward. In a long period of time

Product features of drum type cleaning machine

The product is mainly composed of input, pre washing, main cleaning, rinsing and output parts.
The standard combined cleaning system is very flexible and can be combined according to the special requirements of users.
The reasonable waterway design achieves water saving and high efficiency, and the water consumption is only 500L/ hours.
The pre washing water tank and the main cleaning tank are equipped with steam heating and temperature control devices to adjust the water temperature to achieve the best cleaning effect.
The conveying device adopts frequency conversion speed regulation, and the conveying chain speed is 0.7-7 M / min, which can be adjusted to meet the cleaning requirements under different conditions.
The main cleaning part is equipped with a swing nozzle cleaning system, and the best cleaning effect can be obtained.
The transmission guide rod can be adjusted, and can be used for cleaning various different sizes of appliances.
There is a large detachable panel on both sides of the tunnel for easy maintenance and cleaning.
The whole machine is made of stainless steel.
The nozzle can be dismantled without any tools, and the direction is easy to adjust.
The pre washing and main cleaning parts are equipped with filtration system, which is easy to remove and easy to clean.

Problems of injection mold test

After we finish the mold, we will try the mold, because some defects in the design will cause defects in injection molding. The main defects are several. I will explain them one by one.
Test mold

1, inadequate plastic parts: mainly due to inadequate injection molding machine material position, improper filling flow, or injection machine parameters are not correct, inflatable and exhaust causes are not filled with plastic cavity, plastic parts incomplete or multi cavity cavity filled with several types of cavity filling discontent.

2, the size is unstable: This is mainly due to the poor precision of the mold, the instability of the injection machine and the unstable forming conditions, so that the change of the size of the plastic parts is unstable. It is necessary to modify the mold or adjust the parameters of the injection molding machine.

3. Bubble: due to excessive gas or bad exhaust in the melt, the residual gas in the plastic part is found to be smaller or cluster holes. The surface of the product is not beautiful.

4, Microcosm: due to poor pressure preservation, poor plastic parts cooling, uneven wall thickness and plastic shrinkage, need to adjust the product structure.

5, too large flex: due to poor mold clearance, too large clearance, or plastic flow too good, too much material to make plastic parts edge extrusion extra thin.

6, the weld mark is obvious or too much: because the plastic temperature of the front end is relatively low, the resin phase is difficult to solve, and so on.

What problems should be paid attention to in CNC punching process design

Stamping is a processing method for forming the required shape and size of stamping parts by exerting external force on plate, strip, pipe and profile by press and die to produce plastic deformation or separation. A large number of stamping parts such as automobiles, instruments and meters, household appliances, bicycles, office machines, living utensils and so on. Below is a brief introduction to the design of CNC punching machine.

First, the design principle of numerical control program
The design method of numerical control program has two kinds of manual programming and automatic programming. No matter manual programming or automatic programming, the numerical control program produced should have clear program structure, standard statement, good readability and strong modifiable. Especially for single piece small batch numerical control production, it may be necessary to modify and adjust the program at any time in the machine tool control cabinet. The readability and modifiable of the program are particularly important.

Two. Select the appropriate programming base
In most cases, the base point of the CNC punch press is based on the original point of the machine tool, but sometimes the programming base point outside the original point can greatly reduce the numerical calculation in the program design, reduce the program section and the programming workload, increase the readability and modifiable program, and reduce the errors in the program design. The programming base points can be selected at any part of the part or machine tool, but must be related to the positioning datum of the parts.

Three. Choose the proper order of changing the mold and the path of the knife
When designing CNC punching machine, we should choose a reasonable order of replacement, usually with a circular hole, a rear hole, a big hole after the hole, and a shape after the center. In order to shorten the processing time, at the same time, a set of molds should be selected after all the holes needed to be processed on this part. In order to reasonably select the die changing sequence, we should also select the tool path and ensure the safe and reliable operation of the machine.

Four. The reasonable position of the clamp and the way of displacement
CNC punch press every clamp positioning has a certain range of processing, when exceeding this range, we must clamp the shift to complete the rest of the processing. When the gripper is shifted, the sheet material is pressed by the pressing block first, and the clamp is moved to the base position, and then clamped and continued to process.

Five, reasonable way of discharging
For CNC punching of small and medium-sized parts, typesetting process is usually used to improve the utilization ratio of materials. The process of typesetting can achieve a reasonable route and a reasonable replacement order. At the same time, the auxiliary processing time is shortened and the processing time is saved.

Six. Centralized design of stamping process
In the machining programming of CNC punching machine, the principle of centralized design should be followed, that is, to complete the machining of all types of holes and shape of the CNC machine tool in one time, so as to prevent the occurrence of repeated positioning error. This can give full play to the advantages of CNC machine tools, improve production efficiency and ensure machining quality. For some parts that must be relocated, the method of repeated positioning should be considered fully, and in the case of repeated positioning, the holes with related dimensions should be done as far as possible in a machining location.
Chongyachejianb

The above is the attention to the process design of CNC punch press, good programming habits and clear design ideas, the selection of reliable raw materials and good performance equipment is the key to improve the technological level

The technical difficulties in producing aluminum alloy radiator profiles

Aluminum alloys are widely used in heat dissipating equipment due to their light and beautiful appearance, good thermal conductivity and easy processing to form complex shapes. The design, manufacture and production of aluminum alloy radiator profiles are very difficult.

1. ingot quality requirements
The alloy composition of the ingot must be strictly controlled to ensure the purity of the alloy. The ingot must be homogenized to make the ingot’s microstructure and properties uniform. The surface of the ingots should be smooth, and there is no segregation or slime. The end face of the ingot must be smooth, not cut into a step shape or the cutting slope is too large (the slope should be less than 3mm).
Because the step shape or cutting slope is too large, when the plane die is used to squeeze the heat dissipated profile, if there is no design diversion, the ingot is directly touched by the mold. Because the ingot end face is not flat, the mold is first touched in some places, and the stress concentration is produced. It is easy to squeeze the tooth shape of the mould, or cause the different succor of the material. The phenomenon of extrusion molding is not good.
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2. requirements for the mold
The heat treatment of the mould is very important. It is necessary to use vacuum heating to quenching. It is best to use high pressure pure nitrogen quenching to ensure that all parts of the die after quenching are homogeneous in performance. After quenching, three tempering is required, so that the hardness of the mould is guaranteed to have enough toughness under the premise of HRC48-52. This is an important condition to prevent the die from breaking.
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3. pressure requirements
In order to prevent the die breaking from the extrusion pressure, the extrusion pressure is related to the length of the ingot, the size of the alloy deformation resistance, the state of the ingot, the size of the deformation degree, and so on. Therefore, the extrusion of the cast rod of the aluminum profile should not be too long, which is about (0.6-0.85 times) of the length of the normal casting bar.
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4. Requirements for extrusion process
The key to the production of the profile of the radiator is the first test die of the extrusion die. If there are conditions, the simulation test can be done on the computer to see whether the working belt of the mold design is reasonable, and then the die is tested on the extruder. The first test model is very important, the manipulator should let the main plunger forward and press down under the low pressure of lower than 8MPa. It is best to use the light beam to look after the die outlet. When the die is successfully pressed, the extrusion speed should be controlled so as to achieve smooth operation. When producing radiator profiles, attention should be paid to the heating temperature of the mould, and the mold temperature should be similar to the temperature of the ingot. If the temperature difference is too large, the temperature of the metal will be reduced due to the slow extrusion speed when the upper pressure is pressed.
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In addition to the above factors, the extrusion technology of the profile of the radiator is related to the ability and level of the extruder, the automation of the rear equipment, and the working skills of the workers. The different section of the heat dissipating section should take corresponding measures according to its characteristics, and it can not be generalized. Dongguan Chicco Industrial Co., Ltd., specializing in the processing of aluminum automotive power amplifier radiator, aluminum profile home sound radiator and aluminum LED radiator mainly, also camp CNC processing, all kinds of aluminum and hardware accessories manufacturing.

Milling cutters + features + application

The SEHW series square shoulder milling cutter in ISO can be machined in various forms, such as plane, right angle face and slot. Comb, dense tooth and super dense tooth have its own length. The safe blade groove and brand are used and optimized for a long time. It can realize high efficiency cutting with different conditions and use 4 blade blade with good economy.

The knife is designed with a big positive angle, and the cutting edge is light. The blade’s main cutting edge is a space curve with A edge compensation. The S blade can get an ideal 90 degree on the knife body. When the main angle is on the main corner, there is enough side angle to ensure that the cutting is steady, the maximum depth can reach 10.8MM and the maximum feed can reach 0.3MM/Z.
The blade adopts a simple screw pressing method, the blade is conveniently transposition, the blade has a large space, the cuttings are smooth, the unique blade and tool structure design and manufacture, so that the cutting tool has a high precision. This greatly improves the machining precision and the surface quality of the processed workpiece.
The cutter body is protected by the cemented carbide tool pad with precision plane machining, and the cutter body is durable.

How much do you know about the gain performance of the antenna

Gain means that when the input power is equal, the letter generated by the actual antenna and the ideal radiation unit at the same point in space.
The ratio of the power density to the number. It quantitatively describes the degree of concentration of an input power by an antenna. The gain is obviously related to the antenna pattern. The narrower the main lobe, the smaller the sidelobe and the higher the gain. It is possible to understand the physical meaning of gain by generating signals of a certain size at certain points at a certain distance.
Antenna gain is used to measure the ability of antennas to transmit and receive signals in a specific direction. It is one of the most important parameters for selecting base station antennas.
Generally speaking, gain enhancement mainly depends on reducing the width of the vertical radiating lobe, and maintaining the omnidirectional radiation performance on the horizontal plane. Antenna gain is very important for the operation quality of mobile communication system, because it determines the signal level of the cellular edge. Increasing the gain can increase the coverage of the network in a definite direction, or increase the gain margin within a certain range. Any cellular system is a two-way process, increasing the gain of the antenna and reducing the gain Budget Margin of the bidirectional system. In addition, the parameters for antenna gain are dBd and dBi. The DBi is relative to the gain of the point source antenna, and the radiation in all directions is uniform; the gain of dBd relative to the symmetrical phase antenna is dBi=dBd+2.15. Under the same conditions, the higher the gain, the farther the distance is. Generally, the antenna gain of GSM directional base station is 18dBi and omnidirectional 11dBi.
If an ideal non directional point source is used as the transmitting antenna, the input power of 100W is required, and when a directional antenna with a gain of G = 13 dB = 20 is a transmitting antenna, the input power is only 100 / 20 = 5W. In other words, the gain of an antenna, with the radiating effect on its maximum radiation direction, and the direction free theory. Compare the input power magnification with the point source.
The gain of the half wave symmetric oscillator is G = 2.15 dBi; the 4.5 wave symmetric oscillator is arranged along the vertical line, forming a vertical.
The gain of the four element array is about G = 8.15 dBi (dBi this unit represents the ideal source of the homogeneous radiation.
If the half wave symmetric oscillator is used as a comparison object, the unit of gain is dBd.

Which industries can be applied to the PU conveyor belt

White material PU conveyor belt is a food grade conveyor belt, green material conveyer belt processing and white material is a bit different, the surface is soft, the hardness is relatively large, can be made of anti oil anti fat conveyor belt, the white polyurethane (PU) conveyer belt not only has high tensile strength, good winding, light, thin, toughening of the ordinary conveyor belt. And other characteristics, and oil resistant, non-toxic, hygienic, easy to clean. This kind of conveyor belt accords with hygienic standard, wearable and resistant to physical aging. It is a durable transportation product.

It is suitable for transportation of packaging machinery and fresh surface food, transportation of surface food oven, transportation of surface food processing equipment, chocolate food delivery, biscuit food delivery, Pu food conveyor belt, and White PU conveyor belt, with good anti stickiness, the conveying goods and conveyor belts are separated quickly and effectively. No trace, especially for conveying bread and dough.

PU conveyer belt has the characteristics of oil resistant and wear-resistant, especially for puffed food delivery, fried food PU conveyor belt and black PU conveyor belt, ink green Pu conveyor belt with good anti oil, anti chemical oil properties, cutting resistance, piercing resistance, abrasion resistance, good soft toughness, and used in mineral oil and hydrocarbon products. It is mainly used in production and processing of steel, aluminum, iron and steel machinery, wood sheet Pu conveyor belt, steel transportation, aluminum plate transportation.

Teach you how to wear good saws

aw blade is a general term for thin circular cutting tools used for cutting solid materials. The saw blade can be divided into: diamond saw blade for cutting stone; high speed steel saw blade for cutting metal materials (not embedded hard alloy cutter head); used for solid wood, furniture, wood-based panel, aluminum alloy, aluminum profile, radiator, plastic, plastic steel and other carbide saw blades.
So how do you get a good saw? Today, the sharp sharp saw blade will give you great publicity!!! dance

1, the sawing blade first measure the outer diameter of the saw blade and the center hole, select the centering washer, then put the saw blade on the saw blade seat, and then lock the roll cap of the saw seat, then relax the lock screw and move the saw seat, so that the size of the saw blade is aligned with the blade seat, and then the screw is locked. If the saw blade has broken or made new teeth, guide plates must be used. Generally speaking, it is easier to use guide millstones, so guide plates should be used as far as possible.
2, circular saw blade rotating tighten adjustment if the rotation of the saw blade does not properly tighten, then the blade forward displacement will not be allowed, so when the blade is installed, the circular saw blade is rotated in the direction of the left hand against clockwise. If the loosening is unsuitable, the M17 open wrench is used to adjust the anti loose nut to make the rotation of the saw blade loose and tight. When. The principle of tightness can eliminate the inertia of the saw blade and the impact of the grinding wheel, so it should not be too tight.
3. The thickness of the saw blade is adjusted to make the saw tooth grinding energy average. The center of the grinding wheel and the thickness center of the saw blade should be in a straight line.

4, because the cutting angle adjustment is often changed due to the material to be machined by the saw blade, the suitable cutting angle should be chosen according to the material of the cutting material. The adjustment method of cutting angle is to relax the clamping screw first, then rotate the base of the saw blade to the cutting angle, and then lock the clamping seat screw.
5, tooth type transformation usually has two types of teeth, one is triangular teeth, two is curved teeth, and the teeth should be decided before grinding. When changing the gear type, when the machine is running, change the gear type button with the L plate hand, and choose the type of gear to be rubbed.
6, high and low gear difference before grinding should decide whether to sharpen the high and low teeth. If you want to sharpen the high and low gear, adjust the high and low gear adjustment rod to the required scale.

The function of the universal pen

The powerful function of “universal telemetry pen” comes from the smart chip + hand control technology. It is not only a universal measuring pen, but also a high sensitivity test device. It can not contact electrical equipment, can remotely detect the electric equipment of various voltage levels, and can quickly find a variety of electrical equipment, such as wires, cables, electric blankets and so on. No broken line and broken line position; can find the position of shallow wall catgut embedding; can quickly measure electrical equipment, wire and cable circuit break; can help you solve many electrical maintenance technical problems, and have self inspection, induction control, AC and DC identification, digital and sound, light display and other characteristics. The specific functions are as follows:
Self checking function ensures that the product is safe and reliable.
1. Contact digital display;
2, ultra long distance telemetry high and low voltage electricity (automatic alarm);
3, close distance telemetry high and low voltage electricity (automatic alarm);
4, divide the power zero and fire line out of the wire layer;
5. Quickly locate the broken line in the insulation layer of cables, wires, electric blankets, etc.
6, find the location of shallow wall catgut embedding.
7, distinguish the DC power +, – pole;
8. Estimate the capacity of the battery;
9, daily electrical circuit inspection (such as plugs, wires, electrical appliances, fuse, etc.);
10. Electronic device testing (e.g. resistors, capacitors, diodes, transistors);
11, static electricity check (can detect cloth category);
12, electrical equipment leakage inspection;
13. Estimate the insulation resistance of electrical equipment;
14. AC and DC sound recognition;