JPS60137527A - Method for coining work - Google Patents

Abstract

PURPOSE:To form the end face of a work to a good flat face free from generation of burrs by pressing the end face of the work after pressing the corner of end face of the semicylindrical work and forming a flat face by coining. CONSTITUTION:The semicylindrical work W set on a lifter 23 mounted on a die 21 is fixed by a pad 15 attached to a punch 7 by lowering an upper holder 3. Lowering of the upper holder is continued, and the slanted part 29 of a cam driver 31 attached there to is engaged with the slanted part 39 of a cam slide 33 to slide the cam slide 33 to the work W side. The corner part 35 of end face 1 of the work W is pressed and squeezed by the pressing part 37. Then, the upper holder 3 is further lowered, and coining of the end face 1 is performed by bringing the tip 20 of the punch 7 into contact with the end face 1 and pressing it while holding the work W between bent parts 45 of the lifter 23 and die 21 and a pad 5.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a coining method for flattening the end face of a workpiece, particularly a semi-cylindrical workpiece.

"Prior Art" The conventional coining processing method is explained based on FIG.

A bonder 103 and a pad 105 are vertically provided on a -1-boulder 101 which can be raised and lowered. On the other hand, the lower holder 107
A die 109 is installed in the die 109 . Then, by avoiding lowering the upper holter 101, the work W is fixed between the pad 105 and the tie 109, and the tip 111 of the punch 103 presses the end surface 113 of the work W, thereby coining the end surface 113.

When performing such coining processing, the punch TO3 is usually lowered so that the tip 111 touches the end surface 113 of the workpiece W.
When the bonder 103 contacts and presses -C, a gap 1- is formed between the tip 111 of the bonder 103 and the tie 109, as shown in FIG. 2, which is an enlarged view of the main part of FIG. Therefore, when the end surface 113 of the workpiece W is pressed during coining, the workpiece W enters this gap t, causing the burr 11
5 occurs. Therefore, in such a conventional coining processing method, it is impossible to form the end surface 113 of the workpiece W with a good flat surface, and when these semi-cylindrical workpieces are welded together, the end surface There is a problem that the two do not fit together without any gaps.

[Objective of the Invention] This invention has been made by focusing on such conventional problems, and its purpose is to provide a method for making the end face of a semi-cylindrical workpiece a good flat surface. The purpose of the present invention is to provide a coining processing method.

[Summary of the Invention] In order to achieve this object, the present invention provides a method for pressing the corner of the end face of the work before pressing the end face of the work to form a flat surface. It is something.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be explained in detail based on FIGS. 13 to 10.

FIG. 3 shows a coining machine 1 for coining a semi-cylindrical workpiece W (shown in FIG. 8) to make the end surface 1 flat 11.
3 and 4 are cross-sectional views of a mold for 10. A bonder 7 is hung vertically on the hole 3 so as to include one pad 5. The pad 5 can be raised and lowered on this punch 7. A spring chamber 9 provided in the upper part of the pad 5 is loaded with a gun 13 like a spring that urges the pad 5 downward. Further, the pad 5 is locked to the punch 7 by the ``norange'' portion 15 formed on the upper part of the pad 5 coming into contact with the bent portion 17 of the punch 7 . That is, the flange portion 15 is brought into contact with the bent portion 17 by the biasing force j of the ammunition 13.

On the other hand, the lower holter 19 is provided with a tie 21.
A lifter 23 that supports the workpiece W is attached to the tie 21 so as to be movable up and down. This lifter 23 is attached to the lower end of the lifter 23.
A cushion bin 25 for lowering the seat is attached. The lifter 23 can rise until the flange portion 24 formed at the lower part of the lifter 23 comes into contact with the bent portion 26 formed on the die 21.

The upper holder 3 on the side of the bond 7 has a sloped part 2 at the lower part.
7, 29 OJ: Cam driver 31 equipped with action section 30
is installed vertically. Further, a workpiece W is placed on the die 21.
A cam slide 33 is installed that moves toward and away from C. On the workpiece W side of this cam slide 33, there is a workpiece W.
By pressing the corner 35 of the end surface 1, the pressing part 3 is crushed.
7 is formed, and the cam 1': force 11 on the wiper 31 side. The slide 33 is formed with three sloped parts that slide in contact with the sloped part 29 and an slope Δ1141 that slides in contact with the sloped part 27. Furthermore, the cam slide 33 has three sloped parts and a sloped part 4.
1 is formed between the actuated portion 42 and 1.

Between the bending part 43 of the nom slide 33 and the bending part 45 of the die 21. A spring-loaded pitcher 47 is loaded to push the cam slide 33 toward the cam driver 31 side.

Next (Explain the S action.

4-3 in Figure 4, the workpiece W is placed on the lick 23 at the cellar 1.
In the state C, where the flange portion 24 of the lifter 23 is held up until it comes into contact with the bent portion 26 of the finish 21, the boulder 3 is lowered and the rose l-” 5 is placed on the soil surface of the workpiece W. Then, when the upper 4\ruder 33 is further lowered, the bullet +i11'3 is compressed and the workpiece W is fixed between the pad 5 and the lifter 23 by the action of the bullet 13.

By further lowering the upper holder 3 from this state, the inclined portion 29 of the cam driver 31 that had been lowered together with the upper boulder 3 comes into contact with the inclined portion 39 of the cam slide 33.
While the inclined portion 29 is in sliding contact with the inclined portion 39, the cam slide 3
3 approaches and covers one workpiece W against the ammunition 47. Then, the pressing part 37 of the cam slide 33 presses the corner part 3 of the workpiece W.
5, the cam slide 33 approaches the work W until the corner 35 is crushed.

This approach of the cam slide 33 is caused by the cam driver 3
10 until the acting part 30 comes into contact with the acted part 42 of the J bus slide 33. In this way, the corner 35 of the C workpiece W is pressed and crushed by the pressing part 37 of the cam slide (~33) as shown in FIG. 9. (The above movement is shown in FIGS. In this way, after the corner portion 35 of the workpiece W has been crushed in advance, by further lowering the upper holder 3, the cam driver 31 is also lowered, and the action portion 30 of the cam driver 31 and the cam slide 33 are The contact with the actuated part 42 is increased, and the cam slide 33 is in sliding contact with the inclined part 27 of the cam driver 31 and the inclined part 41 of the slide 33.
The cam slide 33 separates from the workpiece W and the actuated portion 42 contacts the side of the cam driver 31, causing the cam slide 33 to stop. figure).

Then, by further avoiding lowering the ten holder 3-C,
When the tip 20 of the bonder 7 contacts and presses the end surface 1 of the workpiece W, the end surface 1 is coined as shown in FIG. 10 (FIG. 7). As a result, the width of the end surface 1 in FIG. 10 is wider than the width of the end surface 1 in FIG. 9. At this time,
Even if there is a gap between the tip 20 and the tie 21 as shown in FIG. 2, the corner 35 of the workpiece W is crushed.
The workpiece W does not get stuck between the tip 20 and the tie 21, and the workpiece W does not become stiff.

In addition, although the shape of the workpiece W is semi-cylindrical in the embodiment described above, it is not limited to this.

[Effects of the Invention] As described above, according to the present invention, before pressing the end face of a substantially cylindrical workpiece to form a flat surface, the corners of the end face of the workpiece are crushed by being pressed. It is possible to obtain a good 9Y flat surface without any burrs caused by the work getting in between the punch and the die.

Note that this invention is not limited to the above-mentioned embodiments,
It is possible to implement the present invention in a manner other than the embodiments described above.

[Brief explanation of drawings]

1 is a cross section M of a conventional coining mold, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view of a coining mold according to an embodiment of the present invention. 4 to 7 are partially omitted sectional views showing the operation of the coining mold shown in FIG. 3, FIG. 8 is a perspective view of a workpiece used in an embodiment of the present invention, and FIG. FIG. 10 is a perspective view of the end surface of the workpiece shown in FIG. 9, with the corners crushed, and FIG. 10 is a perspective view of the end surface of the workpiece shown in FIG. 9, which has been coined. (Representing the main parts of the drawing and explaining the symbols) 1... End face 35... Corner W... Workpiece. Figure 1 Figure 2 Figure 3 Figure 4 (i PJ Figure 8 Figure 10

Claims (1)

[Claims] cF3 is a coining processing method in which a flat surface is formed by pressing the end surface of a workpiece, and the corner portion of the end surface of the workpiece is crushed by pressing in advance before forming the lu surface. Cover] Inning processing power 21
.