Iphone Mobile Phone Card Tray MIM Parts

Introduction of metal injection molding iphone mobile phone Cato MIM parts

Factors Affecting the Quality of Iphone Phone Card Tray

Detection factors

Why is the detection factor put forward as the eight elements? Because some problems are indeed related to detection. For example: whether the calipers are regularly calibrated, there are measurement errors. When the caliper clamps some thin-walled annular products, the product is deformed due to excessive force. Quality engineers do not communicate directly with customers about product quality standards, and cannot fully understand the appearance and functions of products. They can only use the samples produced last time as the standard for this production. Some products do not have dimensional tolerances and so on. I won't say much here.

Design Factors

Product structure design and mold design have a great impact on product production, which determines the breadth of mold technology and the quality of mold and product quality. I won't say more. This part can be understood in a few lessons alone.

Human factor

For example, have you ever found that some products are unstable, the output is low, and the molds are easy to press, but there are no such problems when you change them. This is related to factors such as each person's technique, rhythm frequency, degree of understanding of the product and mold precautions, and the work mentality of the day. Not much to say about this.

Environmental variables

E.g:

1. The temperature difference between day and night in the four seasons of the year will have an impact on the temperature of the mold, the temperature of the circulating water, and even the size of the product.

2. The high relative humidity of the atmosphere reduces the molding density, which is likely to be a change in the surface energy of the powder.

Improper molding parameters

The setting of all molding parameters is only based on the number of samples produced, and extreme molding parameters are prone to occur. Extreme molding parameters themselves are an unstable factor. The use of extreme processes is likely to cause slight changes in the eight factors and other factors. change.

There is a special lesson on how to set stable process parameters from a process point of view for producing unstable products, which will not be repeated here.

The eight elements emphasize "stability overriding everything". Among the eight elements, there are hundreds of single factors that affect stability, and they are intertwined and intertwined. I am just here to give some suggestions and list some cases. I hope everyone will think hard and use their brains to actively exert their subjective initiative.

How standardization is achieved

Talking about so many factors of change, but how to achieve standardization?

Simply put, it is to gradually eliminate various factors of change. This sentence sounds very simple, but it involves a very wide range, and the gap between us is very large now. It is not within the capabilities of one's own efforts, but requires the understanding, cooperation and cooperation of many relevant personnel to achieve this.

This is a systematic project, not a one-off project. From a macro perspective, we need to collect all the systemic problems that exist in daily life, and try to solve the changing factors from the system step by step; from a micro perspective, we need to record the problems and precautions of each set of molds in detail. , form experience, accumulate and share with all formulators.

For example, in the previous production of the R8 tool, two holes were required for one hole, and only one gate was blocked in each hole. The process parameters were set based on such a gate blocking condition. When re-production, the gate blocking was not recorded in the previous production. In this case, the team leader may block one hole for production. At this time, the filling volume will change due to the hole blocking, and the actual filling speed and material volume will also change. If the product is not good, the parameters will be adjusted, which is equivalent to re-trying the mold, which is a waste of startup. Timing and sometimes it just doesn't adjust well at all.

When the mold starts up again, input the machine according to the original standard molding conditions of the original machine (standard molding conditions with detailed remarks and careful and complete recording of process parameters), and start molding after the mold temperature and the barrel temperature are stable. If the product is qualified, continue Production and pay attention to observe whether there are fluctuations in the production process. If the product is not up to standard, don’t just blindly adjust the parameters. First, think about what factors have changed in the eight elements of this production and the last production. If all the factors remain unchanged, the product status should be exactly the same as last time.

E.g:

1. Whether the screw is abnormal, taking the bipolar fixed-moving pliers as an example, the product has wax marks, the fine-tuning parameters do not work, and the large-tuning parameters do not work. Finally, it is found that the screw is abnormal, resulting in excessive shearing. After removing the screw, restore the original parameters and fine-tune, and the wax pattern is qualified.

2. Whether the tension of the plug is unbalanced. Taking the pipe clamp as an example, the product is cracked, and the fine-tuning parameters are invalid. The problem of product cracking is solved after the mold temperature is raised at the same time by adjusting the plug.

3. If the raw materials are recycled too many times, use the round cutting board to block the material handle, and do not block the material handle after replacing the new material.

4. Check whether the nozzle heating is disconnected and whether the cold start is applied. Taking product A as an example, the product is dissatisfied, and the heating coil is checked and found that the heating coil is disconnected. After wiring, the product is still dissatisfied. Although the temperature of the nozzle has just risen to the set value, because the old machine has no cold start protection, the inside of the nozzle is still high. There is some cold material remaining, and the screw feeding is abnormal at this time. At this time, it is meaningless to remove the nozzle and adjust the parameters. After ten minutes, the nozzle is heated through and the product will automatically return to normal.

5. Whether there is a difference in machine temperature, product B was originally produced in No. 4 machine without any problem, but after changing to No. 1 machine, the total length of the product is small. After inspection, it is found that the actual temperature of the material pipe of No. 4 machine is lower than that of No. 1 machine, so reduce the temperature of the material pipe After 10 degrees, the product size is qualified.

6. Whether the nozzle is blocked, and whether the operator of the machine operates according to the precautions. Taking product C as an example, the product is cracked, shrunk, and unstable. The inspection found that the nozzle hole was blocked by iron slag, resulting in excessive injection pressure loss. The product is unstable. The crack is the position of the weld line, and the weld line will not crack after the speed of the weld line position is slowed down. The front mold shrinks, lowers the temperature of the front mold, and the shrinkage is temporarily qualified after adding pressure, but the material head sticks to the front mold due to reducing the temperature of the front mold and increasing the holding pressure, and the material head does not stick to the mold after repairing the runner. During the continuous production process, the material head appeared to stick to the mold again. The inspection found that sometimes the cold material was left on the edge of the sprue sleeve. The activator did not remove the cold material in time, and the cold material was driven into the pulling hook, resulting in low strength of the pulling hook and mold opening. When the pulling hook breaks, the material head is not pulled to the rear mold, and the product is qualified after simple training for the live workers. The problem is more complex, involving four major elements: machine problem, mold problem, process problem, and personnel problem.

7. Whether the mold core pin is deformed, for example, the D product is cracked, the adjustment parameters are invalid, and the deformation of the head of the mold core pin is found, causing the product to be unsmooth and cracked, and the product will not crack after the core pin is repaired. The core needle may be caused by the deformation of the stamper due to the fact that the employee did not take the product out of the mold during production.

8. Check for changes in ambient temperature. For example, there is a wax pattern on the opposite side of the gate of the E product. Check that the nozzle is blocked. After the nozzle is disassembled, the green body inspection is qualified. After two days of continuous production, the gate shrinks and the inspection is due to the recent rise in ambient temperature, which causes the mold temperature to be high. After the mold temperature is lowered by 5 degrees, the product is qualified.

9. If you can't find any changes, try to fine-tune the parameters. For example, the thin wall of the F product is not satisfied, and the middle shift is not adjusted well. On the second day, the original conditions were restored, and the thin wall was full, but the small column far from the gate was not full. After fine-tuning the holding pressure and the holding pressure switching position, the product was qualified. Note 1. The adjustment parameters should be kept unchanged, and the parameters should not be adjusted blindly. 2. Be good at summarizing, and write special precautions on the standard molding condition table after each startup is adjusted. In order to avoid product problems caused by not paying attention to these matters when starting the machine next time, and then blindly adjust the parameters.

10. Check whether the raw materials are used correctly, such as cracking of G products and welding lines. After raising the mold temperature, the product does not crack, and the weld line is not very good. Then, it is found that the material is not used correctly. After the material is changed, the weld line disappears, and the product is qualified.

11. Since the machine cannot be arranged, when the mold is switched from a small machine to a large machine for the first time, the mold temperature and material temperature remain unchanged, and the material storage position, injection and pressure keeping are reset.

12. Check whether the injection origin of the machine is zero. For example, the material head of H product sticks to the mold, cracks, and is small in size, so it is impossible to take a short shot. The inspection machine found that the injection origin is -12, and the short shot can be shot after returning the injection origin to zero.

13. Is there any problem with the detection method, for example, the size of the product is small and the detection method is faulty, the product is a thin-walled ring, like a ring, the measurement data is small due to the deformation of the product with a caliper, and the measurement result of the product size after improving the detection method qualified.

14. Check whether there is a crowding phenomenon on the contact surface of the mold. For example, the product J has a cavity for sticking to the mold, and the size of the four-cavity product is large. When checking the mold, it is found that the one-cavity needle of the sticking front mold is a contact-penetrating needle, and the head touch-through position has a Slightly squeezed and does not stick to the front mold after polishing.

15. Check whether the thimble is too deep. For example, the product of K product is deformed. Check the mold and find that the thimble is too deep and the product is too thin, causing the product to be stretched and deformed when it is taken out. After the thimble is shortened, the product is qualified.

16. Check whether the non-return ring cannot seal the glue. For example, the L product cannot seal the glue in the No. 13 machine, and the injection margin of the product is zero, causing the product to shrink. Change to normal machine production.

17. Check whether the mold temperature machine has tripped. For example, if there is cracking in the production of M product, check the mold temperature machine and find that it has tripped. Restart the mold temperature machine. After the mold temperature is normal, the product will not crack.

18. Check whether the raw materials have entered the water. For example, the N product has no problem on the first day of production. The next day, the product sticks to the front mold, the screw creaks and the material storage speed is slow. The inspection finds that the raw material has entered the water, and the product is normal after replacing the new material.

19. Check whether the end position of the mold opening is fixed. For example, the product O has a general alarm on the automatic monitor. Check and find that the setting value of the end position of the mold opening is 215, the actual value is 242.6 for a while, and 238 for a while. Reduce the pressure of the last stage of mold opening, so that each The mold opening position stops near 342.6, and the monitor does not alarm.

20. Check whether there is cold material on the material head, for example, there are flow marks on the P product (in fact, cold material marks), check that there is cold material on the material head near the gate, and it is OK after raising the nozzle temperature.

21. Check whether the mold installation is rotated, and the Q product is not full. Check the mold and find that the mold is installed at 90 degrees, and the flow changes due to the influence of gravity. After the mold is restored to the test mode, fine-tuning is OK.

22. Check the exhaust condition of the mold, for example, the bonding line is trapped, and it is found that the sticker does not allow the venting groove, and the bonding line is OK after the sticker leaves the venting groove.

23. Whether the raw material absorbs moisture, for example, the bubbles of the R product are not well adjusted, check the moisture absorption of the raw material, and the sprayed material still has a lot of water vapor, and it is OK after replacing the new material.

24. Check whether the template is parallel. For example, if the template of S product is not parallel, it will cause cracks at the small ears.

25. Check whether the gap between the mold core and the mold frame is too large. For example, the gap between the mold core and the mold frame of the T product is too large, resulting in a break in the parting surface of the product.

26. Check whether the middle plate of the mold is deformed. For example, the material head of the U product becomes larger, the feed is serious, and the product is unstable. The inspection finds that the middle plate of the mold is too thin and the strength is not enough, which is caused by deformation.

27. Check whether the mold with neutron cylinder has a neutron signal. Once the neutron is not back in place, the ejector pin will directly knock the slider out. For example, the V product, the mold was crashed when the machine was adjusted.

28. Check whether the slider of the mold with the interference between the ejector pin and the slider is fool-proof. Once the slider is not retracted in place, the ejector pin will directly crash the slider. For example, the V mold, the mold was crashed twice during the mold test. Or the ejector pin does not have a retraction confirmation signal, or the ejector retraction distance is not adjusted properly. Once the ejector pin is not retracted to the bottom, the slider directly hits the ejector pin when the mold is closed. For example, when the W mold is tested, the mold is damaged.

29. The original mold, original machine, and original parameters of the X product are light in weight. The inspection found that the fluidity of this batch of raw materials has deteriorated, and the weight of the product is qualified after the material temperature is raised to 190 degrees.

30. The temperature of the mold is low and the product sticks to the front mold when the product Y and product Z are just started. The mold temperature gradually rises after a few continuous molds, and the product no longer sticks to the front mold.

In conclusion, only by realizing the standardization of molding can we fundamentally solve the problem of our current difficulty in starting up. When all these systemic and microscopic problems are resolved and the formation is standardized, it is believed that the company's MIM formation will definitely reach the top level.