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

With the continuous development of the market economy, the continuous improvement of product quality is one of the key factors in the success or failure of market competition. The same is true for the bearing industry. The joining of the WTO and the development of international trade have brought increasing pressure on us. The production of bearing rollers is a relatively complex process, which requires multiple processes and multiple stages of processing to form finished rollers. In the forming process of the roller, there are many factors that affect its quality. For example, a roller blank punched out on a cold heading machine often has inferior products and waste products. For a series of problems, processors are constantly exploring new ways to produce the highest quality rollers with the most economical means. For example, when we formed a bearing roller on a Z31-25 cold heading machine, in addition to under pressurization, stack damage, pitting, and deformation, the roller was qualified at the time of stamping, but after some time, the roller returned to a curve and elastic recovery occurred. . Analyze the cause of the discovery: The raw materials may not all meet the ideal standards when they are processed. For this reason, a set of equipment is required to perform more rigorous alignment in order to obtain the best raw material straightness to ensure the quality of the roller forming.

1. Process analysis

In the production of bearing rollers, there are many quality problems. In the process of stamping and forming a roller, there is often a situation where the squeezing and deformation of the roller after the squeezing are generated.

(1) Under-pressure As shown in Fig. 1, the thickness and length of the roller are significantly different. The difference in shape will also affect the quality of the roller after forming. The bending of the raw material has seriously hindered the pushing effect of the belt wheel, resulting in the difference in feeding effect, resulting in the emergence of pressure owed.

(2) Deformation of the Roller after Compression When the shape after the roller stamping is good, there is a bending phenomenon as shown in Fig. 2 after a period of time. We have initially adopted a one-way straightening device to solve the problem. However, after a period of use, the above problems still occur. After repeated studies, it was found that the unidirectionally curved material shown in Fig. 3 can be reformed, and the bi-directionally curved blank shown in Fig. 4 can hardly be reformed. The bending affects the stamping quality of the roller. Therefore, we use a bidirectional straightening device to straighten bi-directionally curved billets, that is, make appropriate adjustments on the basis of one-way straightening devices to make them suitable devices for large-scale equipment, ie, trial-made two-way straightening devices.

2. One-way straightening device principle

This device is placed in front of a roller cold heading machine belt for stable blanks and alignment before the cold heading machine belts are aligned. Since the alignment of the belt pulley may not be able to achieve the desired effect, the device can effectively change the deficiency, and has a significant pre-straightening effect on the unidirectional bending phenomenon shown in FIG.

Its principle: According to the specific conditions of the material and the degree of flexing, the handwheel is adjusted so that the moving plate drives the D4 and D5 wheels shown in FIG. 5 to move back and forth. Of course, in the case where the objective can be achieved, it is not necessary to adjust the rotation closely, so as to avoid counteraction, resulting in that the billet cannot be moved and the feed length is not enough to cause the pressure to ow, so long as it is appropriate. The device is best used on the Z31-13 roller automatic cold heading machine because the smaller diameter of the small equipment processing roller can suppress the bending of the material bending and bending after bending, and it is still in service.

3. Bidirectional straightening device and its principle

As we all know, the roller processed by the Z31-25 automatic cold heading machine is much thicker than that of the Z31-13 automatic cold heading machine, and the one-way straightening device is unidirectionally curved as shown in FIG. 3 . The effect of raw materials is acceptable, but the multi-directional bending of raw materials is difficult to straighten. In order to effectively achieve the goal 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 shown in Figure 6, the principle is added on the basis of one-way straightening device. A set of one-way straightening devices are aligned to each other at an angle of 90°, and the adjustments are averaged. However, the ideal effect is different from the actual one. The change of the straightening effect and the improvement in the straightening effect will result in difficulty in feeding, and the length is insufficient to cause the pressure to owed. certain. In order to overcome the insufficiency, we will add 204 bearings to each straightening wheel to facilitate the rotation of the straightening wheel. The length of the supporting length will also cause the bending of the reference axis. Therefore, the reinforcing ribs are used to improve the overall structure of the structure. Flexural strength while reducing overall weight. After the design and production were re-tested, the effect was very obvious.

4. Two-way straightening device use effect

We chose to test on the Z31-25 roller cold heading machine. The following table shows the compression conditions of the two-way straightening device before and after use.

From this table, it can be clearly seen that there is a clear difference between the two-way straightening device before and after its use, and it is recommended to promote the use of the device to obtain the best economic benefits. After investigation and analysis, adding a set of two-way straightening devices in front of the feeding wheel in the same industry can effectively improve the bending state of the roller raw materials, and similar devices are used for the same equipment at home and abroad.

5. Conclusion

The one-way straightening device we originally used cannot achieve the effect of bidirectional straightening. For this reason, we have actively taken measures to design and manufacture a set of two-way straightening devices. In summary, the two-way straightening device is of great help to the cold forming of many processes in the roller processing, reducing wastes, reducing the bending phenomenon of the blanks, and having great significance in production.

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