JPS6047015B2 - Bending and cutting method for plate materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The method of the present invention involves bending one or both sides of a board in the width direction;
In the method of cutting the plate material to a certain length, the bending process and cutting process is performed with almost no cutting layer, thereby preventing material loss. In the method of bending in a direction that intersects with the line and cutting and separating it into pieces of a certain length, the processing process involves sequentially instructing the bending part of the planned cutting line in the width direction and inserting a pressure-bearing cut line, and The present invention is characterized by combining a processing step of feeding the section to a bending tool, separating the score line and performing the bending process, and at the same time causing the tool to act as a cutter to shear the remaining cutting line. It is something to do.

For example, in order to manufacture square-shaped, L-shaped, etc. silver contacts from a predetermined silver plate material or silver-coated plate material, the bending process cannot be performed unless the bent portion is first cut out.

For this reason, conventionally, as shown in Fig. 1, the planned cutting line of the bending part is punched out using a press punching tool ', the edge with the cutting burr is slightly removed, and a constant width W- is cut in the feeding direction of the plate material a. A cutting groove is formed with a width W-, which is then sent to a bending tool c' to perform bending IC, and the remaining part of the planned cutting line following the cutting groove b is cut to the same width W- as above by a press cutter d'.
It is punched and cut into an O shape and has a certain width W-
,, W-2 becomes cutting waste, so the above-mentioned constant width W-,, W-2 is 20% in the length between the cutting pitches P, like a silver contact.
For small products, which account for ~30%, the ratio of material loss is large, and when the plate material a is an expensive item such as a precious metal, the loss becomes large. The purpose of the method of the present invention is to almost prevent the formation of a cut layer as in the conventional method, thereby causing no material loss, and one embodiment thereof will be described as follows.

In the plate material 1, V-shaped symmetrical pilot cuts 3, 3 are sequentially formed by cutting on both sides of the planned cutting line 2 in the width direction as shown in FIG. 2, and then the planned cutting lines are cut as shown in FIG. 2
Press the bottom and top surfaces of the part required for bending to create a 0.
．． 02T! Cut lines 4, 4 having a ■-shaped cross section are made to create a seam 5 with a thickness of approximately Rln, and a shallow cut line 6 having a v-shaped cross section is similarly made between the cut lines 4, 4. Of course, the joint 5 may be made to have a thickness of 0.0 TmfrL and may be virtually eliminated. Further, the shallow cut line 6 may not be formed at all. Next, the tip of the cut lines 4, 4 is bent at right angles in the width direction as shown in Figure 4, 1, ■, and at the same time, the remaining part between the cut lines 4, 4 on the planned cutting line 2 is sheared. Product 7 in FIG. 5 1 is used. 6 to 14 show a press device adapted to perform the above-mentioned processing, and is composed of a lower mold 11 and an upper mold 12.

A die plate 13 is fixed to the upper surface of the lower mold 11, and a rectangular hole 14 is provided in the plate.
A pair of upper and lower guide plates 15 and 16 are fixed to the upper surface of 3. The guide plates 15 and 16 extend toward the front as shown in FIGS. 8), the upper guide plate 16 is provided with a plate passage groove 18 that passes over the center of the rectangular through hole 17, and guide protrusions contacting the upper edge of the side surface of the plate 1 are formed on the lower edges of both sides of the passage groove. 19, 19 are provided. Plate material 1 supplied to the starting end of the guide plate 15 on the front side in FIG. 6
is held down by the guide protrusions 19, 19 and sent in the direction of the rectangular through hole 17 at a constant pitch. (Fig. 9) The guide plate 16 has a rectangular through hole 17 and a material passage groove 18.
Presser tool insertion cut cut into both edges of. A slot 20, a pilot forming tool insertion notch 21, a cutting line pressure forming tool insertion notch 22, and a bending female tool mounting notch 23 are provided symmetrically, and a square hole 14 and a square through hole 17 are provided. In addition, a die 24 whose upper surface matches the upper surface of the guide plate 15, and a wedge da. A 25, the cutter plate 2, and the female bending tool 27 are tightly fitted and fixed. A portion of the die 24 also exists on the lower surface of the holding tool insertion notch 20 to form the bottom surface of the material passage groove 18, and is aligned with the pilot forming tool insertion notch 21 to form the material passage groove 18 on both sides. horizontal V-shaped edge 29
, 30 are formed in the tool insertion hole 28 in two stages, front and rear.
The wedge die 25 is connected to the material passage groove 18 as shown in FIG.
a die element 31 having a low ■-shaped protrusion protruding from the center;
Die element 32, 3 with slightly higher V-shaped protrusions on both sides thereof
It is a combination of 2 and 2. The bending female tool 27 has a bending groove 33 in the center, and bending guide edges 34 on both sides thereof.
34, a punch holder plate 36 with a convex cross section supported by a spring 37 is provided in a slightly wide sliding groove 35 below the bending groove 33, and a convex portion 36a is provided. Bending groove 3
Projects within 3. (FIG. 12) The upper mold 12 has sliding holes 41 fitted into a plurality of ganoid pillars 38 protruding from the lower mold 11, and presses a punch plate 42 corresponding to the die plate 13. Spring 44 and upper mold 12
The guide pillar 38 is supported by a protrusion limiting pillar 45 fitted into the guide pillar 38, and is loosely fitted to the guide pillar 38.

The upper mold 12 has a material passage groove 18 of the guide plate 16.
and the presser tool insertion notches 20, 20.
As shown in the figure, the holding tool 46 is in almost contact with the upper surface of the die 24, and the pilot forming tool insertion notch 2 is as shown in FIG.
1, a punching tool 47 that enters the tool insertion hole 28 of the die 24 and almost touches the horizontal V-shaped edge 29 when entering, and a slightly longer positioning tool 48 that enters the horizontal V-shaped groove 30 almost in contact with it. ), the die elements 31 and 32 described above,
32, a score line compression molding tool (punch) 49 consisting of punch elements 50, 51, 51 (Fig. 11) having symmetrical low ■-shaped protrusions and slightly high V-shaped protrusions, and a cutter plate 26.
A male bending tool (punch) 52 that passes through the bending groove 33 in almost contact with the rear side edge is protruded and fixed, and these are passed through a rectangular through hole 43 provided in the punch plate 42 and the through hole 4 is inserted.
3, a guide padding 54 for preventing the tools from moving is stuffed and fixed. As shown in FIG. 13, the holding tool 46 is provided with protrusions 46a, 46a for pressing both side edges of the plate material 1 and crushing burrs caused by cutting the plate material 1, as shown in FIG. The male bending tool 52 is provided with knockout pins 53, 53 whose tips are slightly protruded by springs. Figures 6 to 8 show that in the press device, a plate material 1 cut into a band shape to match the width of the material passage groove 18 is fed into the lower surface of the guide protrusions 19, 19 and inserted into the material passage groove 18 as shown in Figure 9. The plate material 1 is fed intermittently at a pitch that matches the length of the cut, and the upper mold 12 is moved up and down each time the feeding operation is carried out to perform press processing. When the presser tool 46 comes into contact with the downward contact shown in FIG. As the tool 47 is lowered, as described with reference to FIG. The plate material 1 is accurately positioned by fitting, and the die elements 30, 31, 31 and the punch elements 50, 51, 51 of the cutting line pressing tool 49 are pressed against each other on the wedge die 25 as shown in FIG. As described in FIG. 3 1, ■, the cutting lines 4, 4 have joints 5 in the parts necessary for bending the planned cutting line 2, shallow cutting lines 6 are made, and the bending female tool 27 At the top, the bending male tool 52 descending toward the bending groove 33 performs shearing at a shallow cutting line 6 using the edge 26a of the cutter plate 26 and the edge 52a of the male tool 52, and the bending guide edge 34, 34 and bending male tool 52
By cutting out the joint 5 of the score lines 4, 4, a product 7 having a mouth-shaped cross section as shown in FIG. 5 is formed.

The punch pedestal plate 36 receives the product 7 and sinks against the spring 37 due to the pressure of the male bending tool 52, and floats up as the male bending tool 52 rises, but the product 7 is punched by the knockout pin 53. remaining on the pedestal plate 36 and bending guide edge 34
, 34, it sticks to the bending male tool 52 and does not rise, and pressurized air (not shown) is applied to the product 7 before and after the protrusion 36a of the punch pedestal plate 36 matches the bottom of the material passage groove 18. ) and blow it backwards. The product 7 can be bent into an L shape as shown in FIG.

According to the above explanation, the method of the present invention is as follows for the plate material 1:
As is clear from the comparison with the conventional method shown in Figure 1,
Even if a pilot cut is made as shown in Fig. 2 without any cutting by press punching, the amount of cutting is extremely small, and the product 7 can be manufactured without any or almost no material loss.
In particular, in products such as silver contacts that use expensive plate materials such as precious metal plates, material loss can be kept to 2% or less, which is 20% less than conventional methods. It is possible to significantly improve yield defects such as material loss of about 1.5% or more.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the conventional bending cutting method, Figs. 2 to 4 show the method of the present invention, Fig. 2 is a plan view of machining of pilot cut 3, Fig. 3 1, ■ is a plan view and cut front view of processing of the cut line 4 and shallow cut line 6 with joint 5, Fig. 4 1, ■ is a plan view and front view of processing of bending and shearing, Figure 1, ■ is a front view of product 7, Nos. 6 to 14
The figures show a press apparatus suitable for carrying out the method of the present invention, in which FIG. 6 is a plan view of the lower die 11, FIG. 7 is a bottom view of the upper die 12,
FIG. 8 is a vertically sectional side view of the required portions of the lower die 11 and the upper die 12, FIG. 9 is a cross-sectional view of the material passage groove 18, and FIG. 10 is the wedge die 25 and the cutting line pressure forming tool 49. Perspective view of 1st
Figure 1 is a cross-sectional view of the same, Figure 12 is a cross-sectional view taken along line A-A in Figure 6,
FIG. 13 is a front view of the holding tool 46, and FIG. 14 is a plan view of the punching tool 47 and positioning tool 48. 71...Plate material, 2...Planned cutting line, 4
... Cut line, 5 ... Joint, 6 ...
...Shallow cut line, 7...Product.

Claims (1)

[Claims] 1 In a method of bending a plate material in a direction that intersects the feed direction and cutting it into pieces of a certain length, there is a processing process in which the cutting lines are made by sequentially cutting the planned cutting line in the width direction and cutting lines are made. The plate 26, the bending groove 33, and the bending groove 3
A bending female tool 27 is provided with bending guide edges 34, 34 on both sides of the cutter plate 26, and an edge 52a is provided corresponding to the edge 26a of the cutter plate 26 to cause shearing by the edge 26a. The tip of the plate material is fed from the planned cutting line to a bending press device consisting of a bending female tool 52 that descends toward the bending groove 33 to bend the edge 34,
34 and a bending female tool 52 to separate and bend the cutting edge of the plate material, and at the same time, the processing step is combined with a processing step of shearing the planned cutting line using the edge 26a and the edge 52a. Bending cutting direction of plate material.