tablet press Die Processing Section

1. first talk about processing, cutting (before heat treatment), grinding plane, pressing, rough car size, quenching, tempering, cleaning, external grinding, no center grinding, flat grinding, external grinding, polishing, inspection, packaging, the general process is like this.

2. or first to say the most common mold and the cheapest, that is, ZP series, the use of bearing steel processing mold, they are what kind of process, the first few processes are not processed, direct rough car size (sheet cup surface is also directly out of the car), quenching, external grinding, centerless grinding, flat grinding, polishing, inspection, packaging. Such a process can not be consistent (because it is out of the car) without tempering directly processing the next process, the internal stress of the material can not be eliminated. The back process is also very rough.

The mold process of 3. high speed sheet press is basically the same as above. Some manufacturers do not tempering after quenching, the internal stress of the material can not be eliminated, the finish of polishing the cup surface is inconsistent, and many details are not well controlled. Such as chamfer, R angle, polishing, non-main size and so on. Don't look at these small details, if you want to really do these details is difficult. The most critical quality problem is material and heat treatment (quenching).

4. foreign imported mold looks comfortable, like you see figure, appearance, very temperament of the beauty, ha. The details are very good and the consistency control of all dimensions is very good. The most important thing is that materials and heat treatment technology are excellent.

On the Problem of Viscosity and Die-drawing of Pressing Bubble

pressing effervescent sheet sticky impact, basically can not be avoided, physical, process, humidity control is good, may delay the sticky impact time, if not effectively controlled, basically 3-5 minutes to start sticky impact, simply can not continue production.

At present, most of them solve the problem of adhesion by insert gasket (Teflon). In general, such gasket can relieve the time of adhesion, which can be pressed for 1-2 hours, and the time may be pressed for a long time according to physics and formula.

Because of the hardness problem of Teflon, the pressure of pressing effervescent tablets is large, the life of gaskets will be reduced, and the inlaid gaskets can be replaced and low cost, which is only suitable for flat oblique effervescent tablets or tablets.

The reason of drawing die is that the diameter of effervescent sheet is too large, the contact surface between punching rod and middle die is too much. If the high speed pressing sheet produces heat and the powder is worn in the middle die, the main reason of drawing die or astringent punching can be solved by adding wool felt up and down under the down-punching rod.

On the issue of acerbity;

1. the main reason is that the dust is very fine. In the process of pressing, the material penetrates into the middle hole of the middle die, and the upper and lower friction leads to acerbity.

The matching gap between the 2. rod and the middle die is too large, which leads to a large number of materials being wasted in the middle die, and the gap between the punching rod and the middle die needs to be matched according to the H5 tolerance.

3. it is difficult to avoid the penetration of the medium mold with very fine materials, the lower punching gap can be processed at right angles (very sharp knife edges, materials remaining on the surface of the medium mold can be scraped). And processing difficulty is also on the one hand, check knife edge is very sharp, can use thumb nail to slide is very sharp.

4. processing into the angle of the die, can not scratch the residual in the mold, is the cause of astringency.

Mold cleaning

It is recommended to use isopropanol to clean, if there are conditions to buy an ultrasonic cleaning machine (Taobao is very cheap) automatic cleaning, clean dry, coated with antirust oil, stored in the box, such a box is very suitable for storage mold, Easy to help, clean, maintain.

It is suggested that it be cleaned automatically in the alkaline cleaning solution prepared by 70 degrees deionized water, followed by hot water washing and removal of cleaning liquid, which can perfectly realize the automatic cleaning of the mould. A little need to remind, the existing foreign mold manufacturers have special for mold ultrasonic cleaning stainless steel shelf, matching use is very convenient.

Life of punching die

The life of punching die is generally referred to by the number of tablets pressed by single punch. The material is different, the coating is different, and the difference is great. The life of punching die is only a reference, because the composition of each powder is inconsistent, for a specific powder, the material is different, the life must be very different, but the price is not the same.

Maximum pressure the die can withstand

There is a direct relationship between the pressure on the 1. die and the material, of course, the use of hard, wear-resistant materials can significantly increase the maximum pressure on the die, the current pharmaceutical industry (global) is more common S-7, of course, the cost is also relatively high, in addition to raw materials expensive, processing costs are also high; as mentioned above several other materials, domestic suppliers are more, this is for the domestic die can be sold at a lower price;

2. the pressure the die can bear is proportional to the area of the cross section of the punch, which is easy to understand;

3. so the maximum pressure on the die is not experienced, it needs to be measured and calculated; this result is usually included in the factory test certificate or specification; In addition, I would like to explain that, do not equal the pressure that the die can withstand and the average pressure displayed by your tablet press, these two values aside from the majority of domestic tablet press pressure test results of the actual value of the actual value, the measurement principle is different, said a little complex, you want to know that you can go to self-study, a simple example: the maximum force is at a specific pressure and a certain period of time when the die does not deform, and you press the process, obviously each die to bear the "maximum pressure" time is relatively short, so, there are many careless comrades may find, Even if you press more than the recommended maximum pressure, the die is not found damaged, but it is not recommended. If the actual value of the pressure is consistent with the display value of the equipment, our company has one, which is HBM by Germany. On the other hand, whether the tablet press can bear the pressure, in fact, the pressure that the tablet press itself can bear is very large, the key is whether the punch can bear, The punch may be different because of material or specifications (such as 7 mm and 10 mm,.

Foreign molds use pressure gauges, domestic molds use pressure gauges.

From the point of view of technology and technology and materials, there are still some differences between domestic mould and foreign mould.

1. appearance; if you take a group of foreign molds and domestic mold appearance can be seen, foreign mold appearance finish is very high. Why can't domestic reach such finish? Mainly because the domestic processing process of the last to the process with a centerless grinder to polish the body, not the whole drag automatic polishing. Because such polishing time will be long, domestic mold prices are low, can not afford to hurt. Using a British mold manufacturer IHolland company's mold, it is undeniable IHolland the company is good, but his price is more than 10 times the domestic mold.

2. steel and heat treatment; now most of the steel used in high speed sheet press die is 6 CrW2Si, low speed die is GrCr15, steel. There are still great technical problems in the heat treatment of steel. I am not engaged in heat treatment. But now most domestic mold manufacturers use salt bath furnaces and net belt furnaces, and very few vacuum furnaces. I hope you can control the temperature and hardness well.

3. processing technology; the process involves technical issues, I would like to say a few words, now many manufacturers still stay in the previous process, there is not much improvement.