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: Raw materials may not all meet the ideal standards when they are processed. For this purpose, 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) Underpressure 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) The deformation of the roller after the press-rolling occurs when the roller stamping shape is better. After a certain period of time, the bending phenomenon shown in Fig. 2 occurs again. We used the one-way straightening device to solve this problem. However, after a period of use, the above problems still arise. 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 a one-way straightening device, so that it becomes a device suitable for large-scale equipment, ie, a trial-made two-way straightening device.
2. Principle of one-way straightening device The device is placed in front of a roller cold heading machine belt for stable blanks and straightening before the cold heading machine belts are aligned. Because the alignment of the belt pulley may not achieve the desired effect, the device can effectively change the deficiency.
Its principle: according to the specific conditions of the material and the degree of flexing, the handwheel is adjusted so that the movable plate drives the D4 and D5 wheels to move forward and backward. 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. The production and principle of bidirectional straightening device We all know that the roller processed by Z31-25 automatic cold heading machine is much thicker than that of Z31-13 automatic cold heading machine. One-way straightening device The effect of the unidirectionally curved raw material shown in FIG. 3 is acceptable, but it is difficult to straighten the multidirectional bending of the raw material. 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, so we use stiffeners 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.