Yearly Archive June 5, 2020

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Precautions for wire cutting

1. Before starting the machine, check whether the electrical parts are loose. If there are broken wires and parts falling off, inform the professional personnel in time for maintenance.

2. Check the tension of molybdenum wire.

3. Check whether the guide wheel is damaged and change the position of the working face in time to prevent the molybdenum wire from being broken.

4. Check if there is a communication slot in the wire stopper, adjust the position of the working face in time to prevent the molybdenum wire from being broken.

5. Check that the lubricating part of the machine tool has enough lubricating oil.

6. Daily maintenance:

6.1. Add No.30 engine oil once per shift for transverse feed gearbox and longitudinal feed gearbox.

6.2. Each drive shaft, screw rod nut and guide plate of the screw storage barrel shall be added with 30 engine oil once for each plate.

Routine maintenance of CNC lathe

1. Clean and lubricate each guide rail surface every day. For machine tools with automatic lubrication system, regularly check and clean the automatic lubrication system, check the oil volume, add lubricating oil in time, and check whether the oil pump starts and stops regularly.

2. Check whether the automatic lubrication system of the spindle box works normally every day, and change the lubricating oil of the spindle box regularly.

3. Check whether the cooling fan in the electrical cabinet works normally, whether the air duct filter screen is blocked, and clean the dust.

4. Pay attention to check the cooling system, check the liquid level, add oil or water in time, and replace and clean the dirty oil or water.

5. Pay attention to check the main shaft drive belt and adjust the tightness.

6. Pay attention to check the tightness of guide rail insert strip and adjust the clearance.

7. Pay attention to check whether the oil pump in the oil tank of the hydraulic system of the machine tool has abnormal noise, whether the height of the working oil level is appropriate, whether the indication of the pressure gauge is normal, and whether the pipeline and all joints have > leakage.

8. Pay attention to check whether the guide rail and machine tool protective cover are complete and effective.

9. Pay attention to check the mechanical accuracy of all moving parts to reduce the deviation of shape and position.

10. Clean the machine tool, clean the iron scraps and wipe the cooling liquid at the guide rail every day after work to prevent the guide rail from rusting

Processing customized two-color plastic mold for daily necessities

Two color mold: two kinds of plastic materials are injected on the same injection molding machine, which are divided into two parts, but the product is only molded once. Generally, this kind of molding process is also called double material injection molding, which is usually completed by a set of molds and requires a special two-color injection molding machine. At present, the two-color mold is becoming more and more popular in the market. This process can make the appearance of the product more beautiful and easy to change colors without spraying, but the cost is expensive and the technical requirements are high.

1. The two shapes of the master mold are different, forming one product respectively, while the two shapes of the male mold are exactly the same.

2. After the front and back dies of the die rotate 180 o in the center, they must match. This inspection must be done in the design, which requires high positioning processing of the mold base.

3. The total thickness of front formwork panel plus a plate shall not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as maximum mold thickness, minimum mold thickness, Ko hole distance, etc.

4. The nozzle of the three plate mold should be designed to automatically demould. Pay special attention to the demoulding action of the soft rubber nozzle.

5. When designing the master mold for the second injection molding, in order to avoid the second master mold inserting (or wiping) to damage the rubber position of the first molded product, part of the master mold can be designed to avoid air. However, the strength of each sealing position must be carefully considered, i.e. in injection molding, is there any possibility of plastic deformation under large injection pressure, leading to the possibility of batch front in the second injection molding?

6. During injection molding, the product size of the first injection molding can be slightly larger, so that it can be pressed more tightly with another male mold during the second molding, so as to achieve the sealing effect.

7. Pay attention to whether the flow of plastic will impulse the products that have been molded for the first time during the second injection molding, so as to deform the glue position? If this is possible, we must find ways to improve.

8. Before closing the A and B plates, pay attention to whether the front mold slider or inclined roof will reset first and crush the product? In this way, we must find a way to make the A and B plates close the mold first, and then the slider or inclined roof of the front mold can be reset.

9. The water transport layout of the two female and male formworks shall be as sufficient as possible, and shall be balanced and the same.

10.99% of the cases are that the hard part of the product is injected first, and then the soft part of the product is injected. Because soft rubber is easy to deform.

Introduction of two color mold

Two color mold: two kinds of plastic materials are injected on the same injection molding machine, which are divided into two parts, but the product is only molded once. Generally, this kind of molding process is also called double material injection molding, which is usually completed by a set of molds and requires a special two-color injection molding machine. At present, the two-color mold is becoming more and more popular in the market. This process can make the appearance of the product more beautiful and easy to change colors without spraying, but the cost is expensive and the technical requirements are high.

1. The two shapes of the master mold are different, forming one product respectively, while the two shapes of the male mold are exactly the same.

2. After the front and back dies of the die rotate 180 o in the center, they must match. This inspection must be done in the design, which requires high positioning processing of the mold base.

3. The total thickness of front formwork panel plus a plate shall not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as maximum mold thickness, minimum mold thickness, Ko hole distance, etc.

4. The nozzle of the three plate mold should be designed to automatically demould. Pay special attention to the demoulding action of the soft rubber nozzle.

5. When designing the master mold for the second injection molding, in order to avoid the second master mold inserting (or wiping) to damage the rubber position of the first molded product, part of the master mold can be designed to avoid air. However, the strength of each sealing position must be carefully considered, i.e. in injection molding, is there any possibility of plastic deformation under large injection pressure, leading to the possibility of batch front in the second injection molding?

6. During injection molding, the product size of the first injection molding can be slightly larger, so that it can be pressed more tightly with another male mold during the second molding, so as to achieve the sealing effect.

7. Pay attention to whether the flow of plastic will impulse the products that have been molded for the first time during the second injection molding, so as to deform the glue position? If this is possible, we must find ways to improve.

8. Before closing the A and B plates, pay attention to whether the front mold slider or inclined roof will reset first and crush the product? In this way, we must find a way to make the A and B plates close the mold first, and then the slider or inclined roof of the front mold can be reset.

9. The water transport layout of the two female and male formworks shall be as sufficient as possible, and shall be balanced and the same.

10.99% of the cases are that the hard part of the product is injected first, and then the soft part of the product is injected. Because soft rubber is easy to deform.

Test standard before CNC machining

Inspection standard before processing:

1. After the completion of each middle division, first copy the work coordinates, and then check whether the distance from the center to both sides is the same again after clearing, so as to ensure that the middle division and the reading are correct.

2. Select, install, set and read the coordinates of Z axis. Select the appropriate tool according to the programming list, clean the tool head and the nozzle thoroughly before installing the tool, and check whether the tool is skewed with the calibration table after installing the tool. Check again after reading

Check once to avoid wrong knife and wrong number, which will cause great loss to the company.

3. Transfer program, start machining: use single section to execute before cutting, adjust the transfer speed and feed speed to the slowest speed, lower the cutter slowly, watch the machine tool display Z axis allowance, check if there is any abnormality, press the pause key immediately if there is any abnormality, and find out the original

To solve the problem, confirm that everything is normal and adjust to the right speed to start processing.

4. In the process of machining, pay attention to observe whether the machining is abnormal, whether the cutter is worn or not. If the cutter is seriously worn, pause the grinding to ensure the normal machining.

Select the tool type according to the shape of the machined profile

For concave surface, in semi finishing and finishing, the ball head cutter should be selected to obtain good surface quality, but in rough machining, the flat end end end milling cutter or round end milling cutter should be selected, because the cutting conditions of the ball head cutter are poor; for convex surface, the flat end milling cutter or round end milling cutter is generally selected in rough machining, but the round end milling cutter should be selected in finish machining, because of the circle The geometric condition of angle milling cutter is better than that of flat end milling cutter; for the side with demoulding inclination, taper milling cutter should be selected. Although the bevel can be processed by interpolation with flat end milling cutter, the machining path will be longer and the machining efficiency will be affected, and the tool wear will be increased and the machining accuracy will be affected.

Precautions for CNC machining

1. The rotating speed of white steel knife shall not be too fast.

2. The copper cutter uses less white steel knife and more throwing knife or alloy knife.

3. When the workpiece is too high, it should be cut thick with different lengths of knives in layers.

4. Smooth the knife only when the margin is consistent. After the big knife is used for roughening, use the small knife to remove the surplus material.

5. The plane shall be processed with flat bottom knife and less spherical knife to reduce the processing time.

6. When the copper worker cleans the corner, first check the size of R on the corner, and then determine the size of the ball knife.

7. The four corners of the surface shall be level.

8. Where the slope is integer, it shall be processed with slope cutter, such as pipe position.

9. Before each working procedure, think about the surplus left after the previous working procedure, so as to avoid empty cutter or excessive machining.

10. Try to take a simple cutting path, such as contour, trenching, single side, less surround height.

11. When walking wcut, if you can walk finish, don’t walk rough.

12. When the shape of a smooth knife is smooth, it should be rough first, then fine. When the workpiece is too high, it should be smooth first, then the bottom.

13. Set tolerance reasonably to balance machining accuracy and computer calculation time. The tolerance is set to 1 / 5 of the allowance when opening rough, and to 0.01 when smoothing.

14. Do more processes to reduce the time of empty cutting. Think more and reduce the chance of mistakes. Do a little more auxiliary line auxiliary surface to improve the processing condition.

15. Establish a sense of responsibility and carefully check each parameter to avoid rework.

16. Be diligent in learning, good at thinking and continuous improvement.

Milling non plane, more ball knife, less end knife, do not be afraid to receive knife.

The small knife cleans the corner, the big knife is refined;

Don’t be afraid to mend the surface. Proper mending can improve the processing speed and beautify the processing effect.

High hardness of blank material: better reverse milling

Low hardness of blank material: good milling

Good accuracy, rigidity and finish machining of machine tool: it is more suitable for down milling and vice versa

It is strongly recommended to use down milling for the finishing of internal corners of parts.

Rough machining: better reverse milling, finish machining: better forward milling

Good toughness and low hardness of tool material: suitable for rough machining (machining with large amount of cutting)

Poor toughness and high hardness of tool material: suitable for finishing (machining with small cutting amount)

Analysis of the market development prospect of stationery dichroism

The survey report shows that the prospect of China’s stationery market is broad, which is obvious to all, but only brand stationery with high product quality and innovative design can obtain higher added value. According to the survey report, 72.5% of consumers are not only interested in the main functions of the product, but also in other auxiliary functions.

For example, the best-selling heteromorphic pens are the representatives. The head of Shanghai golden crown golden pen marketing department said: “at present, there are many kinds of heteromorphic pens in the market, and their functions are more and more diversified, and their creativity is more and more amazing. Crayons, modeling pens, feather pens, fruit pens, gear pens Just listening to these names is new. Nowadays, pens are not only simple pens, but also toys and even works of art. Besides students, adults also like these new things very much. Another important sales channel of these irregular pens is gifts and gifts from enterprises and institutions. ”

In today’s Internet era, the traditional four treasures of study are being replaced by keyboard and mouse, but pen is still an important working tool in the hearts of many business people, and it has become an essential personal item for people who are really familiar with life art. Some top-level commemorative pens are designed by famous teachers with the latest technology, exquisite craftsmanship, precious raw materials, and relying on the commemorative social themes, which are of great collection value and ornamental value.

The performance advantages of Chinese mould

1. Small density: the density of plastic is small, which is of great significance for reducing the weight of mechanical equipment and energy saving, especially for vehicles, ships, aircraft and spacecraft.

2. High specific strength and specific rigidity: the absolute strength of plastic is not as high as that of metal, but the density of plastic is small, so the specific strength (σ B / ρ) and specific rigidity (E / ρ) are quite high. In particular, reinforced plastics made of various high-strength fibrous, flaky and powdery metals or nonmetals as fillers have higher specific strength and stiffness than metals.

3. Good chemical stability: most plastics have good acid, alkali, salt, water and gas resistance. Under normal conditions, they do not react with these substances.

4. Good electrical insulation, thermal insulation and acoustic insulation.

5. Good wear resistance and self lubrication: plastic has small friction coefficient, good wear resistance, good self lubrication, high specific strength and low transmission noise. It can work effectively in liquid medium, semi dry or even dry friction conditions. It can be made into bearings, gears, cams, pulleys and other machine parts, very suitable for low speed, small load occasions.

6. Strong adhesion.

7. Good molding and coloring performance.

Operation process and precautions of CNC milling machine

1、 Purpose

In order to improve the company’s efficiency and ensure the delivery time of parts processing, this document is hereby formulated in a unified and standardized way of operation.

2、 Scope of application

It is suitable for company computer gong operator.

3、 Responsibilities and authorities

1. Daily cleaning and maintenance work, training for users, correct operation of computer gongs and machine tools.

Job content:

2. Clamping method and tool use standard before processing:

1) Press strip, vise, magnetic table, fixture, select the best clamping method according to the applicability of the workpiece.

2) Bead: pay attention to the cleaning of the burr and iron chips on the plane of the machine and the adjustment of the height of the bead, so as to avoid the collision between the knife arm and the bead.

3) Vise: pay attention to the cleaning and clamping force of the fixed and movable surfaces of the vise.

4) Magnetic table: when using the magnetic table, it is necessary to consider whether the bottom of the workpiece is flat, whether the adsorption surface is large enough, and whether the workpiece edge processing pad is blocked. In order to ensure that the process will not be loose.

2. Inspection standard before processing:

1) After the completion of each division, first copy the work coordinates, and then recheck whether the distance from the center to both sides is the same after clearing, to ensure that the division and reading are correct.

2) Select, install, set and read the coordinates of Z axis. Select the appropriate tool according to the programming list, clean the tool head and the nozzle thoroughly before installing the tool, and check whether the tool is skewed with the calibration table after installing the tool. Check again after reading the knife to avoid the wrong knife, which will cause great loss to the company.

3) transmit program and start processing: use single section execution before cutting tool, transfer speed and feed speed to slowest, slow down knife, watch machine tool display Z axis margin, check abnormal, if abnormal, press the pause button immediately, find out cause, solve abnormal, confirm all normal, adjust to suitable speed to start processing.

4) In the process of machining, always pay attention to observe whether there is abnormal machining, whether the cutter is worn or not. If the cutter is seriously worn, pause the grinding to ensure the normal machining.

3. Processing standard of core

1) After getting the drawing and workpiece, first check whether the drawing and workpiece mold number are consistent.

2) Measure the actual size of the workpiece with a measuring tool.

3) Check whether the direction of water transportation and reference angle on the 2D drawing is consistent with that on the programming list.

4) Use 400 × oilstone to clean the burr at the bottom and around of the workpiece, and use cloth chips to clean the workpiece.

5) Place the workpiece on the clamping tool of the machine platform, level the plane and perpendicularity of the workpiece with the parallelism, and the perpendicularity tolerance is within ± 0.015. Then fix the workpiece firmly and start the centring. According to the position indicated on the programming list, divide the centring and z-axis collision number. (pay attention to whether the edge finder collides with the workpiece during the split) input the data of the mechanical coordinates x, y and Z into the corresponding coordinates.

6) Transfer all the programs into the computer according to the programming list, use the tool path simulation software to simulate, check the processing area and the maximum and minimum depth of processing, and determine the clamping direction, clamping reservation position and tool length of the workpiece.

7) Install the corresponding tool according to the programming list, and input the tool parameters automatically with the method of automatic tool setting.

8) Transfer the program to the machine for processing.

4. Copper processing standard

1) After getting the program sheet, find the appropriate copper material by comparing the mold number on the program sheet with the size and quantity of copper material.

2) According to the requirements of the programming list, process the rough and the young. (to avoid common mistakes of coarse and young materials, the copper material is marked with a code, “a” for young male, “B” for coarse male.

4) Check if the tool on the program sheet matches the tool on the machine magazine. The program is simulated with the tool path simulation software, and the machining area, the maximum and minimum machining depth are observed to determine the clamping direction, reserved position and the length of the tool.

5) Transfer the program to the machine for processing. In the process of workpiece processing, the next workpiece to be machined must be prepared to reduce the above preparation time.

5. Formwork processing standard

1) After the workpiece is processed, check whether the shape of the workpiece is consistent with the shape of the 3D drawing before dismounting, and then check whether the workpiece has the position of missing processing, over cutting and smooth connection at the junction.

2) According to the data marked on the programming list, use the calibration table or depth gauge to measure the accurate number, and use the needle gauge or plug gauge to measure some matching positions and positioning positions.

3) Measuring parting surface: according to the data provided by the drawing or programming personnel, check the coordinates of several points (x, y, z) on the parting surface, and check whether the parting surface has been machined to the number.

4) Measure whether the depth of all horizontal positions reaches the number. For some positions that need to be connected, first improve the processing, and then paint the color on the connected positions and then slowly connect them.

5） Check the position data of all other requirements for CNC machining accuracy, and confirm that it is OK before getting off the machine.

6. Precautions:

1) Take extra care when removing the tool from the tool holder to avoid scratching your fingers.

2) When using the numerical control program that has not been tried out, the machine cannot be operated fully automatically.

3) When the shaft is still rotating, use extreme care to adjust the coolant flow direction.

4) In case of emergency, press the red emergency switch on the controller.

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