JPS5829598A - Progressive feed press working method - Google Patents

Abstract

PURPOSE:To prevent progressive feed press work form being disabled owing to the spoiling of the flatness of a metallic thin plate during conveyance, by bending a bridge after punching in an L shape for reinforcement when feeding long- sized metallic thin plates progressively and performing press work at plural positions. CONSTITUTION:A metallic thin plate 10 while fed as shown by an arrow 11 is pressed progressively at press work positions P21-P25. At the position P21, locating hole 12 are bored in the metallic plate 10 and at the position P22, a drumlike opening 13 is punched to form a circular plate 15 together with a through opening 14 formed in advance. At the position P23, the plate is drawn to be deformed in a dish shape 16 and at the same time, bridges 17 remaining at edge parts of the openings 13 and 14 are reinforced by being bent in an L shape. At the succeeding position P24, holes 5-8 for fitting screw insertion are formed and at the position P25, circumferential edge parts are drawn and then sheared to separate a product 1 from the metallic plate 10. Since the bridges 17 of the metallic plate 10 are bent in the L shape, the press work is prevented from being disabled owing to variation in feed pitch caused by buckling during conveyance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a progressive press processing method that can perform all progressive processing steps in a trowel process from a metal plate to a desired product.

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, 1 is a bottom cover that is attached to the bottom of the heat-insulating pot, and the manufacturing method for this is explained in Fig. 2. 2 is a long metal plate, Pl to P4 is the press working position. A positioning hole 2a is formed in the plate material 2 at the initial stage, and is used for determining the position fFt to send the plate material 2 correctly to the press working position.The plate material 2 is indicated by arrow α in the figure. When the plate material is moved to the first press working position P1 by being pushed in the direction indicated by , the part A in the figure is punched out to form, for example, a drum-shaped hole, and by forming the hole A, the plate material A narrow force connecting portion remains on both sides of the hole along the longitudinal direction, and for convenience, this will be referred to as a connecting piece 3. After this, the plate material 2 is moved and positioned at the press working position P2. .

At this pressing position P2, the disk portion 4 located between the hole A and the hole 13 formed previously is drawn and formed into a dish-shaped object 4a. After this, plate material 2
By the movement w), the plate-shaped object 4a is moved and positioned at the press working position P3, and through-holes 5 to 8 for inserting mounting screws and the like are bored in the plate-shaped object 4a. Next, press processing position P4
The outer peripheral edge of the dish 4a is squeezed into an annular shape, and at the same time, it is separated from the plate 2 and the bottom cover 1- as shown in FIG. 1 is opened.

According to such a conventional manufacturing method, all the press working can be performed by progressive feeding of the plate material 2, and accuracy can also be ensured in the feeding pitch of the plate material 2, but the plate material 2 cannot be kneaded. Due to its nature, it is thin and bends easily, especially in the vertical direction, and if the curved shape of the disk portion 4 for the effective NiI of the plate material 2 is ensured to be large, then ゛≦hole A, 11 The diameter of the arc portion becomes larger, and the connecting piece 3 becomes thinner and increasingly narrower. On the other hand, the connecting piece 6 is formed by pressing the plate material 2 at each pressing part i]
・It is indispensable as a movement transmitting part when sending it to t. Under such circumstances, when the plate material 2 is pushed and moved by a roller in the direction shown by the arrow α in Fig. 2, it becomes a thin and narrow VC. Compressive force comes to act on the barb 3. When compressive force is applied in this manner, in the worst case, the connecting piece 3 rises in the direction of normal force and deforms in a wave-like manner, as if the seat 1 (has been raised), as shown in Fig. MS4, for example. When this happens, the distance between adjacent press-formed parts 111 on the plate material 2 shrinks and almost matches the feed pitch dimension of the plate material 2, and the progressive press-forming position eventually loses its function. I'm very talented and have that.

(6) The present invention was made in view of the above circumstances, and its purpose is to prevent force from being applied to the plate material when feeding the plate material, despite the fact that the plate material is likely to become thin and narrow due to press working. It is possible to prevent deformation even when the plate material is pressed, to always ensure an accurate correspondence between the press working position and the feed pitch dimension, and to maintain a good outer progressive press working function. The purpose of the present invention is to provide an excellent progressive press processing 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. 10 is a long plate made of metal, for example aluminum, which is shaped into a strip with a thickness of 0°5 and has a low μ
It is wound in a shape, and is intermittently fed to the press working part at a predetermined pitch by a pushing action by a roll feeder (not shown) as shown by arrow 11. Among press working positions Pz+ to P25,
A positioning hole 12 is formed in the plate material 10 at the first stage press working position P21. This positioning hole 12 is used to determine the feeding position of the plate material 10 to each of the press working positions 1'z2 to P25 after the next (4) stage. Now, at the first press working position P22, the plate material 1D is punched out to form a drum-shaped hole 16. As a result, a circular plate 15 is formed by the holes 16 and the holes 14 formed earlier. After this, move 10 plates by the specified pitch.
When it is pressed and located at the second press working position 1'z3,
The front circular plate 15 is drawn and formed into a dish-shaped object 16. On the other hand, the holes 14 are drawn at the same time as the plate-like object 16 is drawn.
The reinforcing bending process is performed so that the edge of the hole overflowing in the longitudinal direction of the plate material 10, that is, the connecting piece 17, forms a 1 shape as shown in FIG. After passing through the processing position P2s, the resistance force of the plate material 10 against bending force in the vertical plane is increased.Next, the plate material 10 is sent to the third press processing position Pz4, and at this point 1
At t\1'24, through holes 5 to 8 for inserting mounting screws, etc., are simultaneously bored in the bottom of the dish-shaped object 16. Thereafter, when the plate material 10 is sent to the fourth processing position P25 and the peripheral edge of the plate-shaped object 16 is further squeezed (5), it is also sheared and the plate-shaped object 16 is separated from the plate material 10,
The bottom cover 1 shown in FIG. 1 is obtained. Although not shown, the plate material 10 is cut into strips as scraps at the next press working position.

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 section 1
Each of the above positions P21 to P is machined by one press machine with all axes of the machining parts corresponding to i'tl'z1 to P25, respectively.
:i5i processing is performed at the same time, and this simultaneous processing is performed each time the plate material 10 is intermittently fed by the same amount.

According to the above progressive press working method, since the reinforcing bending process is performed on the connecting piece 17 at the next stage of the punching press working position where holes such as the second press working position tll'23 are formed, Although the remaining connecting piece 17 becomes narrower due to the formation of the hole 16, it has a large resistance to bending force in the vertical direction. Therefore, it goes without saying that the plate material 10 becomes difficult to bend in the vertical direction and that the connecting piece 17 portion is not deformed into a wave shape during the progressive feeding process of the plate material 10. The parties are often too lenient.

As a result, it is possible to maintain a desired and accurate correspondence relationship between the straightness of the pressing position of the plate material 10 and the feed pitch of the plate material 10, thereby maintaining good progressive press processing. [7] Although it produces such an effect, it can be realized by simply bending both sides of the plate material 10 without adding any new members, so it is advantageous in terms of cost.

In this example, the shape of the reinforcing bending process was formed into a cross-sectional shape, but it is not limited to this shape, and may be any shape such as a cross-section 1niU-shape. Any shape is acceptable. -Also, in this embodiment, the reinforcing bending process is performed in the next stage at the first press process position jiP2z, but this method is performed at the same position as the press process position where the holes 16 are formed. May be adopted.

As described above, the present invention has the following advantages:
Not only is it thinner, but it is also narrower! Despite the unfavorable circumstances, it is possible to prevent deformation of the plate material when feeding the material, maintain the press working position on the plate material and the progressive press working function with good feed of the material. It is possible to provide a progressive press processing method that is advantageous in terms of cost.

[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. During,
An enlarged vertical cross-sectional view along the Ill-Ill line, FIG.
In the figure, an enlarged perspective view of the ss portion during deformation, FIG. 5 is a plan view of the press object showing an embodiment of the present invention, and FIG. 6 is a longitudinal section along the line Vl-■ in FIG. 1fii l';4,
Figure 7 shows λ along the line ■-■■ in Figure 5;
i/ri are the same. In the figure, 1 is a bottom cover, 10 is a plate material, 17 is a connecting piece (hole edge), and P22 to P25 are first to fourth press working positions, respectively.

Claims (1)

[Claims] 1 In a method in which a long metal plate material is sequentially sent to each press working position iMt to complete the desired press work, -C1 The above-mentioned process is carried out at the next stage or the same level as the punching press work position where holes are formed in the board material. A progressive press working method in which reinforcing bending is performed sequentially on the edges of the holes along the longitudinal direction of the plate material.