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Improvement of Feeding Bidirectional Straightening Device of Horizontal Roller Cold Heading Machine

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Time of issue:2020-12-26 11:51
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(Summary description)

Improvement of Feeding Bidirectional Straightening Device of Horizontal Roller Cold Heading Machine

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Improvement of Feeding Bidirectional Straightening Device of Horizontal Roller Cold Heading Machine

(Summary description)

Categories:Technical Support
Author:
Origin:
Time of issue:2020-12-26 11:51
Views:

Information

With the continuous development of market economy today, the continuous improvement of product quality is one of the key factors for the success or failure of market competition. The same is true for the bearing industry. The entry of WTO and the development of international trade have brought us more and more pressure. The production of bearing rollers is a relatively complicated process, which requires multiple processes and multiple links to be processed into finished rollers. During the forming process of the roller, there are many factors that affect its quality. For example, the roller blanks stamped out on the cold heading machine often appear inferior products and waste products. In response to a series of problems, the processors are constantly exploring new ways to produce the highest quality rollers with the most economical means. For example, when we formed the bearing rollers on the Z31-25 cold heading machine, in addition to under-pressure, overlap damage, pitting and deformation, the rollers were qualified at the time of the stamping forming, but the rollers returned to the curve after a period of time. . Analysis of the reasons found that: the raw materials may not all meet the ideal standard during processing. For this reason, a set of equipment is required to perform stricter straightening to obtain the best raw material straightness to ensure the quality of roller forming.

1. Process analysis

In the production of bearing rollers, there are many quality problems. In the process of stamping and forming rollers, under-pressing and deformation of the rollers after forming are often caused.

(1) Underpressure As shown in Figure 1, the thickness and length of the rollers differ greatly, and the difference in shape will also affect the quality of the roller after forming. The bending of the raw material seriously hinders the pushing effect of the belt wheel, resulting in a difference in the feeding effect, resulting in underpressure.

(2) Deformation of the roller after pressing. When the roller has a better shape after stamping, the bending phenomenon shown in Figure 2 appears after a period of time. We initially used a one-way straightening device to solve it. However, after a period of use, the above problems still appeared. After repeated research, it was found that: the unidirectional bending material shown in Figure 3 can be modified, while the bidirectional bending blank shown in Figure 4 is difficult to be modified. Bending seriously affects the stamping quality of the roller. Therefore, we use a two-way straightening device to straighten the bidirectionally bent blank, that is, make some appropriate adjustments on the basis of the one-way straightening device to make it a device suitable for use in large equipment, that is, a trial-produced two-way straightening device.

2. Principle of one-way straightening device

The device is placed in front of the roller cold heading machine belt wheel to stabilize and straighten the blank before the cold heading machine belt wheel straightening. Because the straightening of the belt wheel may not be able to achieve the desired effect, the device can effectively change the deficiency, and has an obvious pre-alignment effect on the unidirectional bending phenomenon shown in Figure 3.

The principle: adjust the hand wheel according to the specific conditions of the material and the degree of curvature, so that the movable plate drives the D4 and D5 wheels shown in Figure 5 to move back and forth. Of course, if the purpose can be achieved, it is not necessary to set the wheels close to each other, so as not to have a negative effect, causing the blank to be unable to move and the length of the feed to be insufficient, resulting in insufficient pressure, as long as it is moderate. This device has the best effect when used on the Z31-13 roller automatic cold heading machine, because the small diameter of the rollers processed by the small equipment is small, which can prevent the material bending and the rebound of the bending after pressing. It is still in production.

3. The production and principle of two-way straightening device

As everyone knows, the rollers processed by the Z31-25 automatic cold heading machine have a much thicker material diameter than the rollers processed by the Z31-13 automatic cold heading machine. The one-way straightening device is more suitable for the one-way bending shown in Figure 3. The effect of the raw material is acceptable, but it is difficult to straighten the multi-directional bending of the raw material. In order to effectively achieve the purpose of straightening, we tried to adopt a two-way straightening device to change the status quo, so we designed a set of two-way straightening device as shown in Figure 6, the principle is to add a one-way straightening device on the basis of A set of one-way straightening device, make it into a 90° straightening state with each other, and adjust the average, but the ideal effect is quite different from the actual. The change and improvement of the straightening effect will lead to difficult feeding, and insufficient length will cause underpressure. certain. In order to overcome the shortcomings, we add 204 bearings to each straightening wheel to facilitate the rotation of the straightening wheel. The extension of the supporting length will also cause the reference axis to bend, so we use stiffeners to improve the overall structure. Flexural strength, while reducing overall weight. After the design is made, it is tested and used again, and the effect is very obvious.

4. Use effect of two-way straightening device

We choose to test on the Z31-25 roller cold heading machine, and compare the compression conditions before and after the use of the two-way straightening device

From this table, it can be clearly seen that the effects of the two-way straightening device before and after use are obviously different. It is recommended to promote the use to obtain the best economic benefits. After investigation and analysis, in the same industry, adding a set of two-way straightening device before the belt wheel can effectively improve the bending state of the roller raw materials. Similar devices are also used in similar equipment at home and abroad.

5. Conclusion

The one-way straightening device we used before could not achieve the effect of two-way straightening. For this reason, we actively took measures to design and produce a set of two-way straightening device by ourselves, and the effect was better after being put into production. In summary, the two-way straightening device is of great help to the cold forming of many processes in the roller processing, reducing waste and reducing the bending of the blank, which is of great significance in production.

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