JPH0126800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a progressive press working method in which each press work from a metal plate to a desired product can be performed in sequential working steps.

A conventional progressive press processing apparatus will be described with reference to FIGS. 2 to 4, taking as an example the case of manufacturing a bottom cover of a heat-retaining pot shown in FIG. In FIG. 1, reference numeral 1 denotes a bottom cover attached to the bottom of the heat-insulating pot, and a method of manufacturing this will be explained with reference to FIG. 2 is a long metal plate, and P ₁ to P ₄ are press working positions. A positioning hole 2a is formed in the plate material 2 at an initial stage, and is used for positioning the plate material 2 to correctly feed it to a press working position. When the plate material 2 is pushed in the direction shown by the arrow a in the figure and moved to the first press working position _P1 , the part A in the figure is punched out to form, for example, a drum-shaped hole. By forming the holes A, narrow edge bars 3 are left on both side edges of the holes along the longitudinal direction of the plate material. After this, the plate material 2 is moved and positioned at the press working position _P2 . This press processing position P ₂
Then, the disk portion 4 located between the hole A and the hole B formed previously is drawn to form a dish-shaped object 4a. After this, the plate-like object 4a is moved by the movement of the plate material 2 to the press working position.
Positioned at _P3 , through holes 5 to 8 for inserting mounting screws, etc., are bored in the dish-shaped object 4a. Next, it is moved to the press working position _P4 , and at the same time the outer peripheral edge of the dish-shaped object 4a is squeezed into an annular shape, it is separated from the plate material 2, and the first
A bottom cover 1 as shown in the figure is obtained.

According to such a conventional manufacturing method, all the press working can be performed by the step of progressively feeding the plate material 2,
Accuracy can also be ensured in the feeding pitch of the plate 2, but the plate material 2 is thin due to its nature and is easily bent, especially in the vertical direction.In order to effectively utilize the upper plate material 2, the area of the disc portion 4 is increased. If this is ensured, the diameter of the arcuate portions of the holes A and B will increase, and the edge bar 3 will become thinner and narrower. On the other hand, the edge crosspiece 3 is essential as a movement transmitting part when sending the plate material 2 to each press working position, and under such circumstances, when the plate material 2 is pushed by a roller in the direction shown by arrow a in FIG. 2, At this time, compressive force comes to act on the edge crosspiece 3, which is thin and narrow. When compressive force is applied in this manner, in the worst case, the edge crosspiece 3 rises vertically and deforms in a wave-like manner, as if buckling, as shown in FIG. 4, for example. If this happens, the distance between adjacent press working positions on the plate material 2 will shrink, which will no longer match the feed pit dimensions of the plate material 2, and there is a risk that the original function of the progressive press process will eventually be lost. .

The present invention has been made in view of the above circumstances, and its purpose is to reduce the force applied to the edge crosspieces when the plate is fed, despite the fact that press working tends to result in thin plates and narrow edge crosspieces. It is possible to prevent deformation even when the press is applied, and to always ensure an accurate correspondence between the press working position and the feed pitch dimension on the plate material, and to maintain good progressive press working function. An object of the present invention is to provide an excellent progressive press working method that is advantageous in terms of cost.

An embodiment in which the present invention is applied to the manufacture of a bottom cover 1 of a heat-insulating pot shown in FIG. 1 will be described below with reference to FIGS. 5 to 7. Reference numeral 10 denotes a long plate made of metal, for example aluminum, which is formed into a band shape with a thickness of 0.5 mm and wound into a roll. It is designed to be intermittently fed at a predetermined pitch by the pushing action of a roller (not shown). The positioning hole 12 is formed in the plate material 10 at the first press position P ₂₁ among the press positions P ₂₁ to P ₂₅ . This positioning hole 12 is used to connect the plate material 10 to each press processing position P ₂₂ to P ₂₅ in the next and subsequent stages.
It is used to determine the feed position. Now, at the first press working position _P22 , the plate material 10 is punched out to form a drum-shaped hole 13. As a result, hole 13
A circular plate 15 is formed by this and the holes 14 formed in advance. After this, plate material 1
0 is moved by a predetermined pitch and positioned at the second pressing position _P23 , the circular plate 15 is drawn and formed into a dish-shaped object 16. On the other hand, at the same time as the plate-like object 16 is drawn, the edge bars 17 on both sides of the plate material 10 in the width direction of the edge of the hole 14 are formed at right angles, for example, to the direction along the width direction of the plate material 10, as shown in FIG. A bending process is applied for reinforcement so that it bends. In this way, the plate material 10 after passing through the second press working position _P23 has increased resistance to bending force in the vertical plane. Next, board material 1
0 is sent to a third press working position _P24 , and at this position _P24 , through holes 5 to 8 for inserting mounting screws and the like are simultaneously bored in the bottom of the dish 16. After this, the plate material 10 is sent to a fourth processing position _P25 , and the peripheral edge of the dish-shaped object 16 is further squeezed and sheared, and the dish-shaped object 16 is separated from the plate material 10, and the bottom part shown in FIG. Cover 1 is obtained. Although not shown, at the next press working position, the plate material 10 is cut into strips as scraps. In addition, in the above explanation, it was explained that the processing is performed on one circular plate 15 in order, but in reality, the press processing position P ₂₁
Each of the above-mentioned positions P ₂₁ to P ₂₅ is processed simultaneously by a single press machine equipped with processing sections corresponding to P ₂₅ respectively, and each time this simultaneous processing intermittently feeds the plate material 10 by the same amount. It is what is done.

According to the above-described progressive press working method, since the edge crosspiece 17 is bent at the next stage of the punching press working position where the holes are formed, such as the second press working position _P23 , the holes 13 Although the remaining edge crosspiece 17 becomes narrow due to the formation of , it has a large resistance to bending force in the vertical plane. Therefore, the plate material 10 becomes difficult to bend in the vertical direction, and the edge crosspiece 17 portion is not deformed into a wave shape or the like during the progressive feeding process of the plate material 10, but is also prevented from being subjected to bending deformation in the vertical plane. Nor. As a result, it is possible to maintain a desired and accurate correspondence relationship between the pressing position of the plate material 10 and the feed pitch of the plate material 10, and to maintain good progressive press processing. Moreover,
Although such an effect can be achieved, it can be realized by simply bending both sides of the plate material 10 without adding any new separate members, which is advantageous in terms of cost.

In this example, the shape of the reinforcing bending process was formed to have an L-shaped cross section, but it is not limited to this shape, and may be a U-shaped cross section, etc. In short, the shape should have a high resistance to bending force. Good to have. In addition, in this embodiment, the reinforcing bending process is performed in the next stage at the first press working position _P22 , but this method is performed at the same position as the press working position where the holes 13 are formed. May be adopted.

As described above, the present invention is capable of preventing the deformation of the edge crosspiece when feeding the material even though the plate material is thin and the edge crosspiece is likely to be narrow in width in order to effectively utilize the material. It is possible to always ensure an accurate correspondence between the press processing position and the feed pitch dimension of the material, and maintain good progressive press processing function.
Furthermore, it is possible to provide an excellent progressive press working method that is advantageous in terms of cost while exhibiting these effects.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the bottom cover of a heat insulating pot shown as an example of an object to be manufactured, Fig. 2 is a plan view of the object to be pressed to explain a conventional progressive press working method, and Fig. 3 is a view of the object to be pressed. 4 is an enlarged perspective view of the s-s portion in FIG. 2 during deformation; FIG. 5 is a plan view of the press object showing an embodiment of the present invention; , Figure 6 is in Figure 5, -
FIG. 7 is a vertical cross-sectional view taken along the - line in FIG. 5. In the figure, 1 is the bottom cover, 10 is the plate material, 13, 1
4 is a hole, 17 is an edge crosspiece, and P ₂₂ to P ₂₅ are first to fourth pressing positions, respectively.

Claims (1)

[Claims] 1 In a method of sequentially sending a long metal plate material to each press processing position and performing desired press processing,
At the next stage or at the same position as the punching press processing position where holes are formed in the plate material, the edges of the holes are bent in the direction along the width direction of the plate material at the edges of the edges on both sides in the width direction of the plate material. A progressive press processing method characterized by performing bending.