JPS6241810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press molding die device, and an object of the present invention is to obtain a product with a complicated configuration in a single press operation.

For example, in the case of oil-filled electrical equipment such as transformers,
In order to enhance the cooling effect, a large number of heat sinks are arranged in parallel on the outer surface of the container box of the equipment.

Fig. 1 shows an example of a side plate when constructing this container box.The product 1, which is the side plate, has heat dissipating plate parts 2 formed by bending and folding a flat steel plate material at right angles at equal intervals. A space 3 is formed inside the heat dissipation plate section 2, and when the container box is assembled and used, the insulating oil injected into the container box flows into this space 3.
However, in order to prevent the insulating oil from leaking, both ends, which are part of the heat dissipation plate part 2, are cooled through the inclined part 5. The constricted portion 4 is surface-bonded, and the side end surfaces of the constricted portion 4 are welded.

Conventionally, as a means for molding this kind of product 1,
Using a transfer device, a flat plate material is press-molded to form a large number of heat sink parts 2 in parallel at regular intervals, one unit at a time, and then both ends of each heat sink part 2 are crushed to form narrowed parts 4. We are taking a process to process it.

Therefore, first of all, the molding process is performed twice, which increases the labor and time and increases the molding time.
Since the transfer equipment itself is large-scale, the capital investment is extremely high, and the product 1 itself is
Since each heat dissipation plate part 2 and the drawn part 4 are not molded at the same time, the shape of the heat dissipation plate part 2 becomes uneven especially when the drawn part 4 is formed, resulting in disadvantages such as a drop in accuracy when assembled as a container box. existed.

The present invention relates to a press molding mold device developed to eliminate the above-mentioned conventional drawbacks and inconveniences, and the present invention relates to a press molding mold device that includes a flat core mold that is erected and fixed in the center of a bed, and a press molding device that is used to sandwich the core mold. a pair of cam drivers which are arranged opposite to each other and whose faces facing the core mold are downwardly sloped; a pair of material holding plates which approach each other downward in the direction of the core mold along the downward slope of the cam drivers; It has a pair of upper molds that sandwich the material together with the plate and move downward toward each other along the downwardly inclined surface of the cam driver, and a notch groove for forming a mold surface is provided at the lower end of the opposing surface of the upper mold. This is the configuration provided.

An embodiment of the present invention will be described below with reference to the drawings.

First, a flat plate-shaped core mold 11 is erected and fixed in the center of the bed 10 of a crank press molding machine.
The length, height, and wall thickness of this core mold 11 are the length, protrusion height, and
This core mold 11 is determined according to the width of the space 3.
is fitted between a pair of clamping plates 12 erected and fixed on the bed 10 at a predetermined interval corresponding to the wall thickness of the core mold 11, and is fixed via a fixture 13.

Therefore, various types of core molds 11 are prepared depending on the size and form of the product 1, and are replaced as appropriate depending on the situation.

Next, reference numeral 14 in the figure is a cam driver, which is fixed on the bed 10.
4 are arranged in pairs along the core mold 11, facing each other with the core mold 11 at the center, and the surfaces facing the core mold 11 are arranged at an angle of 45 degrees. It forms an inclined surface 15 that slopes downward in 11 directions.

In the illustrated embodiment, the cam driver 14 has a block shape of a right triangle with the inclined surface 15 as the hypotenuse, and when the fixed position along the longitudinal direction of the core mold 11 is set as the center line, the cam driver 14 is located at both ends of this center line. The parallel arrangement is such that a pair of cam drivers 14 are fixed facing each other with the core mold 11 at the center, and a pair of cam drivers 14a are fixed facing each other at approximately the center of the center line. 14a is located on the side (arrow view A) depending on the size of the product 1.
direction) and then fixed at a predetermined position.

Further, reference numeral 16 is a thick plate-like lifting plate, and a window hole 16a is formed by cutting out a wide slit in the central part facing the core mold 11, and a core mold is inserted into the window hole 16a. 11 is inserted into the bed 10, and each side end is supported from below by an air action rod 17 protruding from the bed 10, and the forward and backward movement of the rod 17 causes a vertical vertical movement (arrow). The elevation plate 16 is cut out at a location corresponding to each of the cam drivers 14, 14a, so that each cam driver 14, 14 is moved when moving up and down.
It is designed so that it does not come into contact with a.

A pair of material holding plates 18 are respectively placed on the upper surfaces of both lifting plates 16, and therefore both holding plates 18 are located opposite to each other along the core mold 11 with the core mold 11 sandwiched between them. They are connected at their ends by air cylinders 19, respectively.
In addition, the surface of this material holding plate 18 opposite to the surface facing the core mold 11 is an inclined surface 2 that slopes downward in the direction of the core mold 11 at an angle of 45 degrees.
0, and is in contact with the inclined surface 15 of the cam driver 14.

Therefore, when the lifting plate 16 is vertically lowered, both material holding plates 18, which are merely placed on the lifting plate 16, move along their inclined surfaces 20.
slides on the inclined surface 15 of the cam driver 14 and approaches the core mold 11 in a downward direction, and the distance between the opposing surfaces of both material holding plates 18 is 5th at the lower limit.
As understood from the figure, the thickness is approximately equal to the thickness of the core mold 11.

Note that the air cylinder 19 operates when the holding plate 18 is raised via the lifting plate 16 and separates both holding plates 18, but is in a free state when descending. Therefore, they smoothly descend in the direction of approaching each other.

Next, the pair of upper molds 21 are assembled to the ram 22 (omitted in FIG. 2) so that they can slide toward and away from each other on the lower surface of the ram 22 (omitted in FIG. 2), but both opposing surfaces 23 of both upper molds 21 are The straight line formed by the opposing surface 23 in the so-called mold closed state is located directly above the center line formed by the core mold 11,
Further, both upper molds 21 are connected to each other by air cylinders 24 at both ends thereof, and are separated by this operation (in the direction of arrow D) to enter a so-called mold open state.

Among these upper molds 21, one upper mold 21a
is an extremely thick plate, and the opposing surface 23
The surface opposite to the cam driver 14 has an opposing surface 23 at an angle of 45 degrees corresponding to the inclined surface 15 of the cam driver 14.
It is a sloped surface 25 that slopes downward in the direction,
The other upper mold 21b has a square shape having a height and width equal to the wall thickness and width of the one upper mold 21a, and
On the surface opposite to the facing surface 23, a guide block 2 is provided at one end corresponding to the cam driver 14.
6a is provided protrudingly, and a guide block 26b is detachably fixed near the center portion in correspondence with the central cam driver 14a.

The central guide block 26b is moved and fixed in the direction of the arrow E as the central cam driver 14a moves in the direction of the arrow A, and the end surfaces of the guide blocks 26a and 26b are connected to the cam driver. An inclined surface 27 is inclined downward corresponding to the inclined surface 15 of 14, 14a.

A notch groove 28 is provided at the lower end of each opposing surface 23 of both upper molds 21 to form a mold surface of the heat dissipation plate portion 2 of the product 1.

The notch groove 28 is formed by attaching a pair of mold pieces 30 to predetermined positions of a notch recess 29 previously provided along the longitudinal direction at the lower end of the opposing surface 23 with a predetermined interval therebetween via a fixture 31. formed by

That is, the notch recess 29 has a depth and width that is half the thickness and width of the heat sink part 2 of the product 1, and the mold piece 30 has a depth and width that is equal to the depth and width of the notch recess 29. The drawing part 33 is recessed into the fixed part 32 having a wall thickness by the thickness width of the material 1' of the product 1, and extends continuously by the length of the drawing part 4 of the product 1, and further extends toward the tip. It has a structure in which the inclined portion 34, which becomes thinner, is continuous (see FIG. 6).

For both mold pieces 30 that are fitted and fixed facing each other in the notch recess 29, the fixing part 32
The distance between the continuous portion of the slant mold portion 33 and the drawing mold portion 33 is equal to the length of the heat sink portion 2 of the product 1 to be obtained, and the distance between the tips of the inclined mold portions 34 is approximately equal to the length of the core mold 11. Therefore, when changing the size of the core mold 11 depending on the form of the product 1, one of the mold pieces 30 is moved accordingly, and the mold piece 30 is bored at a predetermined position in the notch recess 29. It is attached and fixed to the fixing hole 35 via the fixing tool 31.

In other words, a pair of mold pieces 30 are placed in the notch recess 29.
In the state in which it is fitted and fixed, a deep groove with the same depth as the notch recess 29 is formed between the tips of both inclined mold parts 34, and the thickness width of the material 1' is drawn by the drawing mold part 33 through the inclined parts at both ends of this deep groove. The shallow grooves are continuous,
These shallow grooves and deep grooves form a notch groove 28 which is a mold surface.

In addition, in the other upper mold 21b, on the inner lower surface spaced apart from the notch groove 28 by a predetermined distance,
A locking groove 36 is drilled along the length, and the heat dissipation plate portion 2' immediately after molding is inserted and locked into the locking groove 36 during the press operation described later. Therefore, the interval between the notch groove 28 and the locking groove 36 is equal to the molding pitch of each heat sink part 2 in the product 1.

The upper mold 21 having the above-mentioned structure is pushed down by the ram 22 that descends with a predetermined pressure (in the direction of arrow F), but both upper molds 21 are separated by the air cylinder 24 when rising. It is in an open state,
Furthermore, the air cylinder 24 is in a free state when descending. Therefore, each inclined surface 25, 2 of both upper molds 21
7 are located opposite to each other above the inclined surface 15 of the cam driver 14, and are brought into surface contact with the inclined surface 15 by the lowering of the upper mold 21, and further slid on the inclined surface 15 by the downward force applied to the core metal. They approach each other in the direction of the mold 11, and at the lower limit, both opposing surfaces 23 come into close contact with each other, resulting in a mold closed state.

Now, in the mold device having the structure as explained above, the press operation is as described above.

First, the material 1' made of a flat steel plate has the length and width required for the product 1, and the length of the core mold 11 and the cams at the side ends are adjusted according to the set width of the product 1. Driver 14 and central cam driver 14
a, the distance between the guide blocks 26a and 26a in the other upper mold 21b, the length of the notch groove 28 forming the molding space of the heat sink part 2, etc., are selected and adjusted, respectively.

Figures 2 and 3 show the mold opened state after the above-mentioned adjustment. In particular, in the cross-sectional view of Figure 3, a portion of the material 1' has several heat dissipating plate sections. 2
has already been press-molded.

In this mold open state, the upper mold 21 is raised by the rise of the ram 22, and the upper molds 21a and 21b are in a position where the opposing surfaces 23 are spaced apart by a predetermined distance by the air cylinder 24. When the elevating plate 16 reaches its upper limit position due to the advancement of the air action rod 17, the pair of material holding plates 18 mounted on the elevating plate 16 also rises, and the opposing surfaces are raised by the operation of the air cylinder 19. It is opened to the same extent as the opening interval of the upper molds 21a and 21b, and the slanted surface 20 of the cam driver 14
The upper surface of the material holding plate 18 is at the same height as the upper end of the core mold 11.

Now, in the direction of one upper mold 21a (Figs. 3 to 5)
In FIG. 3, the material 1' inserted between the upper mold 21 and the material holding plate 18 from the right direction in the figure (direction of arrow G) is shown in FIG.
is press-molded, and the heat dissipating plate portion 2' immediately after molding is tightly fitted and locked into the locking groove 36 of the other upper mold 21b. From this state, the upper mold 21 is lowered by the vertical descent of the ram 22, and simultaneously holds the lowered material 1' against the material holding plate 18 while pressing each of the inclined surfaces 25,
27 faces the upper side of the inclined surface 15 of the cam driver 14, and the upper end of the core mold 11 contacts the lower surface of the material 1' (see FIG. 4).

The upper mold 21 continues to descend due to the continuous pressing force applied to the ram 22, the material holding plate 18 descends together with the lifting plate 16, and the contact state of the lifting plate 16 with the bed 10 reaches the lowering limit. Become.

During this downward movement, the material 1' held between the upper mold 21 and the holding plate 18 is transferred to the core mold 1.
1, but both upper molds 21, in which both opposing surfaces 23 approach and descend by the inclined surface 15 of the cam driver 14, cut a part of the bent material 1' into a notch groove 28 portion which is a mold surface. As shown in FIG. 5, at the lower limit, both notched grooves 28 press-form the heat sink part 2 of the product 1 using the core mold 11 as a spacer core, and at this time, the heat dissipation On both sides of the plate part 2, a desired constricted part 4 and an inclined part 5 are simultaneously formed by mold pieces 30, and a heat dissipating plate part 2 is formed by a core mold 11.
Space 3 will be formed in .

In the above-described operation, the upper mold 21 does not simply descend vertically, but gradually descends at a 45-degree inclination guided by the cam driver 14. The holding plate 18 receives the pressing force through the material 1' and lifts the lifting plate 1 through the air action rod 17.
As it descends diagonally while being supported by 6,
During pressing, no excessive force is applied to the material 1', and the material 1' is folded and drawn very smoothly.

As is clear from the above description, the press forming mold device of the present invention has a large number of heat dissipating plate parts 2 arranged in parallel at equal intervals by bending a flat steel plate, and creating spaces 3 inside the heat dissipating plate parts 2. This is an apparatus for forming a product 1 having a configuration in which both ends of the heat sink part 2 are pressed and bonded surface-to-face to form a drawn part 4, and the device presses each heat sink part 2. During molding, the squeezed portion 4 is also press-formed at the same time. Therefore, it is possible to obtain the heat dissipation plate part 2 in a perfect shape through a single pressing process, and since the processes are performed simultaneously, there is no possibility that the product 1 will be distorted or deformed due to the application of excessive force. Therefore, each heat sink part 2 can be made uniform and press-molded with high accuracy.

Therefore, according to the apparatus of the present invention, since the pressing process is completed only once, labor saving can be achieved by shortening the molding time without requiring much labor, and there is no need for large-scale equipment such as a transfer device. Therefore, it is extremely economical, and the resulting product is uniform and accurate. For example, when assembled as a container box for oil-filled electrical equipment such as a transformer, it is possible to provide extremely precise side plates, and the structure is simple and easy to operate. It has many excellent effects such as being easy to use.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view showing an embodiment of a product molded by the apparatus according to the present invention. FIG. 2 is a perspective view of the device according to the invention. Third
4 and 5 are cross-sectional views showing the molding process. FIG. 6 is an enlarged sectional view of a main part showing the mold surface of one of the upper molds. Explanation of symbols, 1... Product, 2... Heat sink part, 4
... Drawing part, 10 ... Bed, 11 ... Core mold, 14, 14a ... Cam driver, 15 ... Inclined surface, 16 ... Lifting plate, 17 ... Air action rod, 18 ... Material Holding plate, 19
... Air cylinder, 20 ... Inclined surface, 21, 21
a, 21b... Upper mold, 22... Ram, 23...
Opposing surface, 24... Air cylinder, 25... Inclined surface, 26, 26a, 26b... Guide block,
27... Inclined surface, 28... Notch groove, 29... Notch recess, 30... Molding mold piece, 36... Locking groove.

Claims (1)

[Scope of Claims] 1. A flat core mold which is erected and fixed at the center of the bed, and which are arranged opposite to each other along the longitudinal direction of the core mold on the bed and centered on the core mold,
at least a pair of cam drivers whose surfaces facing the core mold are downwardly sloped surfaces; a pair of material holding plates that abut the downwardly sloped surfaces of the cam drivers and approach each other downward in the direction of the core mold; and a pair of upper molds that sandwich a flat material together with the material holding plate and that come into contact with the downwardly inclined surface of the cam driver and approach each other downwardly in the direction of the core mold. A mold in which a deep groove having a length approximately equal to the length of the core mold is continuously formed on the lower end of the opposing surface of the core mold, and shallow grooves having a depth approximately equal to the wall thickness of the material at both ends of the deep groove are formed via inclined surfaces at both ends of the deep groove. A press-forming mold device in which notch grooves forming surfaces are provided along the longitudinal direction. 2. The press molding mold device according to claim 1, wherein the core mold is removably erected and fixed in the center of the bed. 3. The press molding mold device according to claim 1, wherein the cam driver is displaceably arranged and fixed along the longitudinal direction of the core mold. 4. The press molding die device according to claim 1, wherein the descending slope of the cam driver has an inclination angle of 45 degrees. 5. The press-forming mold device according to claim 1, wherein the cam driver has a right triangular block shape. 6. The press-forming mold device according to claim 1, which comprises a pair of material holding plates connected by an air cylinder. 7. The press molding mold device according to claim 1, which comprises a pair of upper molds connected by an air cylinder. 8 A notch recess is provided along the longitudinal direction at the lower end of each opposing surface of the pair of upper molds, and a pair of mold pieces can be freely attached and removed within the notch recess at an interval approximately equal to the length of the core mold. 2. The press mold device according to claim 1, wherein the notch recess between both mold pieces is a notch groove forming a mold surface.