JPH0133226Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a press mold that simultaneously performs trim forming to cut out unnecessary parts of a workpiece formed into a predetermined shape and flange forming to bend the edges of the workpiece. Regarding.

(Prior art) The workpiece is formed into a predetermined shape by drawing or piercing in the previous process using a press mold, or the workpiece is sequentially conveyed using a transfer press and formed into a predetermined shape. After that, unnecessary parts of the workpiece may be cut and the edges of the workpiece may be bent. In such cases, conventionally, unnecessary portions of the workpiece are cut off using a press die for trimming, and then the workpiece is transferred to a press die for flanging, and flanging is performed by the press die. Conventionally, these processes have been carried out using two press dies in two processes, so in order to improve work efficiency, we attempted to perform trim processing and flange processing at the same time using one press die. This has led to this.
FIG. 3 is a plan view showing an example of the workpiece W in a state before it has been pressed into a predetermined shape and trimmed and flanged, as described above. It is molded into a predetermined shape during the process. For this workpiece W, unnecessary parts of the workpiece W are cut along the outer peripheral contour line B shown by the dashed line in FIG.
The part outside this contour line B is divided into parts shown by dashed-dotted lines E, and eight parts shown by S1 to S8 are scrapped.
Fold the part indicated by the two-dot chain line G in the figure,
Flanges F1 to F4 are formed there.

The workpiece W having a shape as shown in FIG. 3 is trimmed by cutting off unnecessary parts S1 to S8 as described above, and is bent at the two-dot chain line G to form a flange part F.
FIG. 4 shows a press die for performing the flange processing for forming parts 1 to F4. As shown in the figure, the press mold 1 has a lower mold 2 and an upper mold 3. The lower mold 2 has a lower holder 4 fixedly installed on a base (not shown), and a straight line portion corresponding to the outer peripheral contour line B of the workpiece W shown in FIG. A punch P1 having a bending part consisting of a curved part and fixed to the lower holder 4, and an auxiliary punch having a shape corresponding to the outer peripheral contour line B and the dividing line E of the workpiece W and fixed to the lower holder 4 It consists of a punch P2.

The upper die 3 is provided with an upper holder 5 which is vertically movable above the lower holder 4 and is movable relative to the upper holder 5, and clamps the workpiece W between it and the punch P1 during molding. A pad 6, a die D1 which is fixed to the upper holder 5, and which is not shown in FIG. Holder 5
It works together with the auxiliary punch P2 to cut the scraps S2, S4, S6, and S8, and also works together with the punch P1 to bend the edge of the workpiece E from the curve G to form the flanges F1 to F1.
It consists of a sectional die D2 forming F4. An elastic body 7 such as a coil spring or rubber is provided between the pad 6 and the upper holder 5.
An elastic force is applied to the workpiece W, and the vertical movement stroke of the pad 6 relative to the upper holder 5 is regulated by a stopper 8 attached to the upper holder 5.

A punch P1 and an auxiliary punch P2 that have been prototyped so far for cutting the scrap S2 portion shown in FIG. 3 and processing the flange portion F1, and
The main parts of the die D1 and the sectional die D2 are shown in FIGS. 5 and 6. Dai D1 and Punch P
1 includes scrap that is an unnecessary part of the workpiece W corresponding to the straight line part of the outer peripheral contour line B of the workpiece W.
Cutting blade C1, which works together with S1 to cut from the work W;
A scrap S1 is formed on the die D1 and the auxiliary punch P2 in correspondence with the parting line E.
Cutting edges C2 and C2 are respectively formed to cut the and S2 in cooperation with each other. Further, the auxiliary punch P2 and the sectional die D2 are respectively formed with cutting blades C3 and C3 which cooperate to cut the scrap S2 from the workpiece W in correspondence with the outer peripheral contour line B of the flange portion. Note that the cutting edge C3 of the sectional die D2 protrudes further downward than the cutting edge C2 of the die D1. Therefore, the lowering of the upper die 3 first causes the cutting edge C3 of the sectional die D2 and the auxiliary punch P2 to
After cutting the outside part of the flange part F of the workpiece W by the cooperation with the cutting blade 3 of the die D1 and the cutting blade C2 of the auxiliary punch P2, the part of the parting line E is is disconnected. The horizontal clearances between these cutting blades C1 and C2, between cutting blades C2 and C2, and between cutting blades C3 and C3 are predetermined dimensions necessary for cutting, that is, shearing, the workpiece W. ing. Then, a bending portion A1 is formed on the punch P1 corresponding to the bending curve G of the workpiece W shown in FIG. 3, and this bending portion A1
A bending portion A1 that bends a portion corresponding to the flange portion F1 of the workpiece W in cooperation with the sectional die D2 is formed in the sectional die D2. The mutual horizontal clearance between these bent portions A1 and A1 is set to a dimension corresponding to the thickness of the workpiece W.

(Problems to be solved by the invention) Figures 5 and 6 show that among the work W shown in Figure 3,
It is a diagram showing the main parts of the lower mold 2 and the upper mold 3 for cutting a portion corresponding to the scrap S2 and bending the portion corresponding to the flange portion F1, and shows the main parts of the lower mold 2 and the upper mold 3 for cutting the portion corresponding to the scrap S2 and bending the portion corresponding to the flange portion F1. The portions for processing S6, S8 and the flange portions F2 to F4 have a similar configuration. When the workpiece W is machined using the press die 1 that has been tried so far as shown in Figures 5 and 6, the desired shape of the workpiece W after trimming and flange processing is shown in Figure 7A. Figure 7B
As shown in FIG. 7, so-called tonger portions Q were formed at both ends of the flange portion F1, or as shown in FIG. 7C, there were cases in which the scrap portion S2 was not separated from the workpiece W. When we investigated the cause of this, we found that in Fig. 6, the bending part A of punch P1
1 and the bending part A1 of the sectional die D2, it was necessary to provide a clearance equivalent to the plate thickness, and as a result, a clearance equivalent to the plate thickness was also generated between the die D1 and the sectional die D2. It was hot. When the workpiece W was processed using the press die 1 shown in FIG. 4 using this material, defective products as shown in FIGS. 7B and C were formed.

Therefore, in view of the above-mentioned problems of the prior art, the present invention is designed to reliably cut unnecessary parts from a workpiece and reliably bend the ends of the workpiece, thereby performing trimming and flange processing of the workpiece in one process. The aim is to make it possible to do both at the same time.

(Means for Solving the Problems) The present invention to achieve the above object has a lower die and an upper die that is vertically movable relative to the lower die, and has a cutting blade for cutting unnecessary parts of the workpiece. and a bending part for bending the workpiece, and an auxiliary punch having a cutting edge for cutting an outer peripheral edge of a flange part formed on the workpiece, the lower die being provided with an auxiliary punch that works in cooperation with the punch. a die having a cutting edge for cutting an unnecessary portion of the workpiece; a bending section for bending the workpiece in cooperation with the punch; and a bending section for bending the workpiece in cooperation with the auxiliary punch; The upper die is provided with a sectional die having a cutting edge for cutting the die, and the cutting edges formed on the die and the sectional die are connected to each other, and the cutting edge of the die and the sectional die are connected to each other. This press mold is characterized in that an unnecessary portion of the workpiece is cut by a cutting edge of a sectional die and a cutting edge formed on the auxiliary punch.

(Function) When a workpiece machined into a predetermined shape is processed using such a press die, as the upper die descends toward the lower die, the cutting edge of the punch and the cutting edge of the die first The unnecessary parts are cut off from the work by the cooperation of the cutting blade of the auxiliary punch and the cutting blade of the sectional die, and then, by the subsequent lowering of the upper mold, the unnecessary parts are reliably separated from the work. Under this condition, the flange portion at the edge of the workpiece is bent. As a result, trimming of the workpiece and bending of the flange portion can be simultaneously performed with high accuracy in a single processing step.

(Example) Next, an example of the present invention will be described based on the drawings. FIG. 1 shows a punch P according to an embodiment of the present invention.
1, an auxiliary punch P2, a die D1, and a sectional die D2, and FIG. 5 is a perspective view corresponding to FIG. 5, and FIG. These punch P1 and auxiliary punch P
2, and the state in which the die D1 and the sectional die D2 are attached is the same as that shown in FIG. That is, the punch P1 and the auxiliary punch P2 are fixed to the lower holder 4 to constitute the lower mold 2, and the punch P1
1 has a cutting edge C1 and a bent part A1 on the outer periphery of its upper end.
is formed throughout. A die D1 and a sectional die D2 are fixed to the upper holder 5.

The die D1 and the sectional die D2 are formed with cutting edges C1 and C2 corresponding to the outer peripheral contour line B of the workpiece W shown in FIG. and the auxiliary punch P2 has a scrap S corresponding to the dividing line E.
Cutting blades C2 and C2 for dividing and cutting 1 and S2
is formed. Further, the auxiliary punch P2 and the sectional die D2 have cutting edges C3 and C corresponding to the outer peripheral contour line B of the portion corresponding to the flange portion F1.
3 are formed respectively, and the punch P1 and the sectional die D2 have a bending part A corresponding to the curve G.
1 and A1 are formed, respectively. As shown in FIG. 4, the bending portion A1 formed on the sectional die D2 is formed at a position above the cutting edge C3, and as the upper mold 3 descends, the cutting edge C3 of the sectional die D2 moves into the auxiliary punch. P2 cutting edge C3
After the scrap S2 is cut from the work W by the cooperation of the sectional die D2 and the punch P1, the flange portion F1 is bent by the cooperation of the sectional die D2 and the punch P1.

The horizontal clearance between the punch P1 and the sectional die D2 is set to a gap corresponding to the thickness T of the workpiece W, and the cutting edges C1 and C3 of the die D1 and the sectional die D2 are connected to each other. These are connected at the contact point H. As shown in FIG. 2, the state in which these are connected may be such that the die D1 and the sectional die D2 are manufactured separately and brought into contact with each other, or the two may be manufactured integrally. . Note that the vertical positional relationship between the cutting edge C2 of the die D1 and the cutting edge C3 of the sectional die D2 is similar to that shown in FIG. As the die 3 descends, the cutting edge C3 of the sectional die D2 and the cutting edge C3 of the auxiliary punch P2 first cut the outer part of the flange portion F of the workpiece W, and then the cutting edge C2 of the die D1 and The portion along the parting line E is cut by the cooperation of the cutting edge C2 of the auxiliary punch P2. At this time, since the cutting edge C1 of the die D1 and the cutting edge C2 are in the same vertical position, the cutting edge C1 of the die D1 and the cutting edge C1 of the punch P1 work together to correspond to this part. The parts are cut almost simultaneously.

Next, regarding the action, see Figures 1, 2, and 4.
To explain with reference to the drawings, first, the workpiece W, which has been previously formed into a predetermined shape in the previous step, is placed on the lower die 2 of the press die 1 shown in FIG. 4. At this time, the upper mold 3 is sufficiently separated from the lower mold 2. Under this condition, when the upper holder 5 is lowered, the pad 6 first comes into contact with the workpiece W and the punch P
1, the work W is held between them. When the upper holder 5 is subsequently lowered, the cutting edge C3 formed on the auxiliary punch P2 and the sectional die D are first removed while the pad 6 is still holding the workpiece W.
By working together with the cutting edge C3 formed on the flange portion 2, an unnecessary portion of the workpiece W located outside the flange portion F is cut off as scrap. Following this, the cooperation between the cutting edge C2 formed on the die D1 and the cutting edge C2 formed on the auxiliary punch P2, and the punch P
1 and the cutting edge C1 formed on the die D1, the scrap is cut along the outer peripheral contour line B and the dividing line E shown in FIG. 3, resulting in eight scraps. S1 to S8. At this time, since the cutting edges C1 and C2 of the die D1 and the cutting edge C3 of the sectional die D2 are in a continuous state, the scrap portion is reliably separated from the workpiece W. Furthermore, as the upper holder 5 continues to descend, the third
Portions corresponding to the flange portions F1 to F4 shown in the figure are bent. When the upper holder 5 reaches the dead center, one machining process is completed, and trimming and flange machining of the workpiece W are completed at the same time. The above operations are repeated to sequentially process the work W.

(Effects of the invention) As described above, the invention has a lower mold and an upper mold that can move vertically with respect to the lower mold, and has a cutting blade for cutting an unnecessary part of the workpiece and a cutting blade for cutting the unnecessary part of the workpiece. The lower die is equipped with a punch having a bending portion to be processed and an auxiliary punch having a cutting edge for cutting the outer peripheral edge of the flange portion formed on the workpiece, and working together with the punch, the workpiece is unnecessary. A die having a cutting blade for cutting a portion, and a processing section for bending the workpiece in cooperation with the punch, and a cutting blade for cutting the outer peripheral edge of the flange part in cooperation with the auxiliary punch. The upper die is provided with a sectional die having a sectional die, the cutting edges formed on the die and the sectional die are mutually connected, and the cutting edge of the die and the cutting edge of the sectional die are connected to each other, Since the unnecessary portion of the workpiece is cut by the cutting blade formed on the auxiliary punch,
Trim processing, which removes unnecessary parts from the workpiece, and flange processing, which bends the edges of the workpiece, are performed simultaneously in a single processing step, speeding up the processing. Moreover, unnecessary scrap portions are reliably cut from the workpiece, and flange processing is performed with high precision.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of a press die according to an embodiment of the present invention, Fig. 2 is a plan side sectional view showing the main parts of Fig. 1, and Fig. 3 is shown in Figs. 1 and 2. A plan view showing an example of a workpiece processed by a press die, Fig. 4 is a front cross-sectional view showing the main parts of the press die for processing the workpiece shown in Fig. 3, and Fig. 5 is a prototype work produced so far. FIG. 6 is a perspective view corresponding to FIG. 1 showing the main parts of the press die, FIG. 6 is a plan side sectional view corresponding to FIG. 2 of the press die shown in FIG. 5, and FIGS.
C is a perspective view showing a part of the workpiece processed by the press die. 1...Press mold, 2...Lower mold, 3...Upper mold, 5
...Upper holder, 6...Putted, D1...Die,
D2...Sexual die, P1...Punch, P
2... Auxiliary punch, C1, C2, C3... Cutting blade,
A1...bending part, F1, F2, F3, F4...
...Flange, H...Contact point, W...Workpiece.

Claims (1)

[Scope of utility model registration request] A punch having a lower mold and an upper mold that can be vertically movable with respect to the lower mold, a cutting blade for cutting an unnecessary part of the work, and a bending part for bending the work; The lower die is provided with an auxiliary punch having a cutting blade that cuts the outer peripheral edge of the flange portion, and a die having a cutting blade that cuts an unnecessary portion of the workpiece in cooperation with the punch, and a die that cooperates with the punch. The upper mold is provided with a sectional die having a bending part that bends the workpiece by working together with the auxiliary punch and a cutting blade that cuts the outer peripheral edge of the flange part by working together with the auxiliary punch, and the die and the sectional die The cutting edges formed on the auxiliary punch are connected to each other, and the cutting edges of the die, the cutting edges of the sectional die, and the cutting edges formed on the auxiliary punch in the interconnected state are used to eliminate unnecessary parts of the workpiece. A press mold characterized by cutting.