JP4876804B2 - Shaving method - Google Patents

Description

  The present invention relates to a shaving method.

  In order to obtain high-precision contours such as holes, irregular holes, outer shapes, or gears, it is known to perform shaving processing, which is cutting press processing after punching processing. In order to obtain a more accurate shape, it may be performed a plurality of times. In a conventional shaving process, when a shaving punch 3 and a die, for example, a hole formed in a workpiece is shaved using a shaving punch 3 as shown in FIG. The tip penetrates the workpiece 1 and enters the die 2. The hole is shaped by this process, and the burr 1a generated during the shaving process and the shaving process is removed, but when the burr 1b is generated by the shaving process and the shaving punch 3 is raised and returned, The burr 1b may be bitten between the punch 3 and the side surface of the shaved hole. Such biting causes a problem that a shaved surface is damaged and accuracy and surface properties are deteriorated. In addition, it is desirable that the shavings generated by the shaving process are removed and then accumulated in a predetermined area below the die 2. Could be damaged.

  A processing method for preventing damage to a shaving surface or the like is described in Patent Document 1, for example. However, although the method described in Patent Document 1 is expected to prevent the scattering of shavings, it is considered that the problem of damage to the shaving surface due to biting cannot be solved. Further, in the method of Patent Document 1, since the shaving punch is pressed against the scrap, there is a concern that the wear of the tip of the shaving punch is accelerated.

JP-A-11-156537

  The present invention has been made in view of the above-described problems of the prior art, and provides a shaving processing method in which the shaving processing surface is not damaged when the shaving punch returns and the shavings generated by the shaving processing are not easily scattered. The purpose is to do.

  In order to achieve the above object, the present invention employs the following technical means.

  The invention according to claim 1 is a shaving process of shaving the workpiece (10) using the shaving punch (31), so that the shavings shaved by the shaving punch (31) remain on the workpiece (10). A clearance (between the shaving process in which the position of the tip (31a) at the bottom dead center of the shaving punch (31) is set inside the work (10) and the shaving surface of the work (10) processed by the shaving process ( c) separation step of removing the shavings using a shaving separation punch (33) having a smaller cross-sectional dimension than the shaving punch (31) so that c) occurs. In this way, since the shaving punch does not penetrate the workpiece, there is no occurrence of burrs, and therefore the shaving surface is not damaged when it rises. Furthermore, there is an effect that there is almost no possibility of chipping of the shaving punch. Further, when the shaving separation punch is raised in the shaving separation process, a clearance is generated, so that the shaving surface is not damaged.

  The invention according to claim 2 is a shaving process of shaving the workpiece (10) using the plurality of shaving punches (31, 32) in sequence, and each of the shaving punches (31, 32) shaved by the plurality of shaving punches (31, 32). Shaving in which the positions of the tips (31a, 32a) at the bottom dead center of the plurality of shaving punches (31, 32) are set inside the work (10) so that the shavings are stacked and remain on the work (10) A separating punch (33) having a smaller cross-sectional dimension than the last used shaving punch (32) so that a clearance (c) occurs between the process and the shaved surface of the workpiece (10). And a shavings separation process for removing shavings by using the shavings. Thereby, even when shaving is applied a plurality of times, the same effect as in the invention of claim 1 can be obtained, and the shavings by shaving processing are stacked together so that a plurality of processed parts are gathered so that the mass becomes larger and falls easily. That is, the effect that it becomes difficult to scatter is obtained.

  The invention according to claim 3 is a shaving processing method for shaving the work (10) using two or more shaving punches (31, 32, 34) in sequence, except for the last shaving punch (34). The tip (31a, 32a) at the bottom dead center of the one or more shaving punches (31, 32) so that the shavings shaved by the one or more shaving punches (31, 32) remain on the work (10). Are set inside the work (10), and the position of the tip (34a) at the bottom dead center of the last shaving punch (34) is set outside the work (10), and each shaving punch (31 , 32, 34) The position of the tip (31a, 32a, 34a) at the bottom dead center is positioned downward in the processing direction as the order is later. It is characterized in that. As a result, the shavings by shaving process are combined into a plurality of processing parts, so that the mass becomes larger and it is easy to fall, that is, the effect of being difficult to scatter.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means as described in the Example mentioned later.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a workpiece 10, a die 20, and a punch 30 for punching in a punching process before performing a shaving process method according to the present invention. The workpiece 10 has a round hole 11 formed by punching, and a burr 12 by punching is formed at the end of the hole 11 on the die side and protrudes into the die hole 21.

  2 to 4 are diagrams schematically showing an embodiment of the shaving processing method according to the present invention in the order of steps, showing the state when the punches 31, 32 and 33 in each step are at the bottom dead center. Yes.

  In the method of the present invention, first, the first shaving process shown in FIG. 2 is performed. In the first shaving process, when the first shaving punch 31 enters from the surface side of the workpiece 10 and moves to the bottom dead center, the tip 31a of the punch 31 is located on the inside of the workpiece by a distance b1 from the lower surface of the workpiece 10. is doing. For this reason, the shavings scraped off by the first shaving punch 31 do not remain on the burrs that have been previously formed and fall out of the holes 11. Note that reference numeral 13 in FIG. 2 schematically shows burrs when shaved. Further, since the tip 31a of the punch does not penetrate the workpiece 10, there is no burring due to shaving, and therefore no burring occurs when the punch is raised. The distance b1 is set as small as possible on condition that the shavings do not fall out.

  Next, as shown in FIG. 3, the second shaving process is performed on the same hole 11 of the workpiece 10 by replacing the punch with the second shaving punch 32. The punch tip 32a at the bottom dead center of the punch 32 in this process is located on the inner side of the workpiece by a distance b2 from the lower surface of the workpiece 10. The distance b2 is set to be smaller than b1, but the shavings generated by the second shaving process may be stacked on the shavings generated by the first shaving process and fall out of the hole 11. Absent. Note that reference numeral 14 in FIG. 3 schematically shows the burr for punching and the shavings for the first and second shaving processes.

  Next, as shown in FIG. 4, the separation step of cutting and replacing the punch with the separation punch 33 is performed. The shaving separation punch 33 has a diameter smaller than that of the second shaving punch 32, and thus a clearance c is formed between the inner wall of the hole 11. When the tip 33a enters the die hole 21 toward the bottom dead center, the shavings separation punch 33 is generated in the first and second shaving processes together with the burrs generated in the punching process in cooperation with the die hole 21. The shavings 14 are removed from the workpiece 10.

  The burrs and the shavings 14 that have been removed by the shavings separation punch 33 have a larger mass than the shavings generated by a single shaving process, and are therefore less likely to adhere to other objects. It is easy to fall into the accumulation area (not shown). Further, since the clearance c is present, the shaving surface of the inner wall of the hole 11 is not damaged when the shaving separation punch 33 is raised.

  In the above-described embodiment, the shaving process is performed twice. However, in the present invention, the number of shaving processes is not limited to two, and the above-described embodiment may be performed once or three times or more. It should be understood that it can be implemented in the same way as without requiring a detailed description.

  Next, a second embodiment will be described with reference to FIG. This embodiment is processed in the same manner as in the above-described embodiment from FIG. 1 to FIG. 3, but the last step is replaced with the shaving separation process by the shaving separation punch 33 as shown in FIG. Shaving with the shaving punch 34 is performed. The diameter of the third shaving punch 34 is larger than the diameter of the second shaving punch 32, and the position of the tip 34 a at the bottom dead center enters the die hole 21. In this case, the effect that it becomes easy to fall by collecting shavings is obtained. In the second embodiment, three shaving punches are used. However, the processing may be performed with two shaving punches except for the second shaving punch 32. Also in this case, the shavings are gathered and fall easily.

It is sectional drawing which shows typically the workpiece | work punched by the punch and die | dye. It is sectional drawing which shows typically the 1st shaving process in the shaving process method of the Example by this invention. It is sectional drawing which shows typically the 2nd shaving process in the said shaving process method. It is sectional drawing which shows typically the shavings separation process in the said shaving processing method. It is sectional drawing which shows typically the 3rd shaving process in the shaving process method of another Example by this invention. It is sectional drawing which shows the shaving process by a prior art typically.

Explanation of symbols

10 Work 14 Burr and shaving 20 Die 21 Die hole 32 Second shaving punch b2 Distance

Claims (2)

A shaving step of shaving the workpiece (10) using the shaving punch (31), wherein the shavings scraped by the shaving punch (31) remain on the workpiece (10). A shaving step in which the tip (31a) position at the bottom dead center is set inside the workpiece (10);
Using a shaving separation punch (33) having a smaller cross-sectional dimension than the shaving punch (31) so that a clearance (c) is generated between the workpiece (10) processed by the shaving step and the shaving surface. A shaving process for separating the shavings, and a shaving process for separating the shavings. A shaving step of sequentially shaving the work (10) using a plurality of shaving punches (31, 32), wherein each of the shavings shaved by the plurality of shaving punches (31, 32) is laminated to form the work ( 10) a shaving step in which the positions of the tips (31a, 32a) at the bottom dead center of the plurality of shaving punches (31, 32) are set inside the workpiece (10) so as to remain in 10),
By using a shaving separation punch (33) having a smaller cross-sectional dimension than the shaving punch (32) used last so that a clearance (c) occurs between the work (10) and the shaved surface. A shaving process for separating the shavings, and a shaving process for separating the shavings.

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