JPS6213299A - Die set for powder molding press - Google Patents

Abstract

PURPOSE:To mold a product having an intricate shape by the constitution consisting in providing plural stationary lower punches and stationary plates, stacking the stationary plates above and below by means of connecting blocks and supporting the stationary lower punches to the stationary plates of the respective steps. CONSTITUTION:The stationary plates 2, 3 united by the colupling blocks 8 are disposed between a yoke plate 1 and die plate 4 which are connected by posts 9. A cavity 11 a die 10 facing a punch 12 of an upper punch plate 5 is concentrically provided with the lower punches 15-18 around a core rod 14 to constitute the floating lower punches. The molding is executed by operating respective adjusting rings 24, 29, an air cylinder 27 and a lower ram 7 to adjust the height of the punches 15-18 and to form the cavity 11 having the required shape, then lowering the punch 12 to compress the powder. The product having the intricate shape having the bottom surface divided to >=4 surfaces is thus molded.

Description

[Detailed description of the invention]

[Industrial Field of Application] This invention relates to a die set for powder molding presses. [Prior art] A plurality of lower punches consisting of a combination of a fixed lower punch and a floating lower punch are provided around a core rod inserted into a molding cavity of a die, and the fixed lower punch is supported by a fixed plate and the floating lower punch is A die set is conventionally known which is configured to extrude a molded product by lowering the die plate and lower floating punch after compressing the powder filled in the cavity with the upper punch while supporting the powder with a lower floating punch plate. (For example, Japanese Patent Laid-Open No. 53-80867). [Problems to be Solved by the Invention] In the conventional die set as described above, a fixed plate is required for the fixed lower punch, and a lower punch plate, a floating mechanism, and a stopper are required for the floating lower punch. A release mechanism is required. In such a die set, if the shape of the molded product becomes complicated, it is necessary to increase the number of lower floating punches. However, as the number of floating lower punches increases, the number of lower punch plates increases as well as the floating mechanism and stopper release mechanism, making the entire die set larger and more complex.
There was a problem in that it became difficult to attach the die to the press and to replace the die, and the press also became large. Therefore, the standard of conventional die cents is one with one fixed lower punch and two floating lower punches, and the shape of the product formed by this is as shown in Figures 1 and 2. The limit was to mold something that was divided into three planes. Therefore, the present invention provides two or more fixed lower punches so that the lower surface has four or more planes, as shown in FIGS. 3 and 4.

[The purpose is to provide a die set that can mold two-part products with more complex shapes. [Means for solving problems]

As a means for solving the above problems, the present invention provides a plurality of fixed lower punches and a plurality of fixed plates,
Each fixed plate is stacked vertically via a connecting block, and each fixed lower punch is supported by each stage of fixed plates. [Example] The schematic configuration of the die set shown in the drawings is as follows from the bottom:
Consisting of a yoke plate 1, a lower fixing plate 2, an upper fixing plate 3, a gui plate 4, and an upper punch plate 5, the lower fixing plate 2 is fixed to the press body 6, and the yoke plate 1 is supported by the lower ram 7 of the press. In addition, an upper ram (not shown) is connected to the upper punch plate 5. The lower fixing plate 2 and the upper fixing plate 3 are
They are integrated by connecting blocks 8 placed at different locations (see Figure 1). Four pillars 9 pass through each of the fixed plates 2.3, these pillars 9 connect the yoke 1 and the Goui plate 4, and the lower ram 7 drives the Goui plate 4. A die 10 is fixed at the center of the gouly plate 4, and an upper punch 12 attached to the upper punch plate 5 faces above the cavity 11 of the die 10. Further, the guide plate 13 of the upper punch plate 5 passes through the guide plate 4 in a slidable manner. The cavity 11 of the die 10 has a cylindrical shape, and a core rod 14 passes through the center thereof, and a first lower punch 15 and a second lower punch 1 are arranged around the core rod 14 in order from the outer periphery.
6. The third lower punch 17 and the fourth lower punch 18 are arranged concentrically and close to each other. The first lower punch 15 is attached to an upper holder 19 disposed between the Goui plate 4 and the upper fixed plate 3, and constitutes a floating lower punch. The upper holder 19 is supported by four lifting pins 2o, and each lifting pin 20 passes through the upper and lower fixed plates 2.3 so as to be able to move up and down. The second lower punch 16 is fixed to the upper fixed plate 3 and constitutes a fixed lower punch. The third lower punch 17 is attached to a lower holder 21 disposed between the upper fixed plate 3 and the lower fixed plate 2, and constitutes a floating lower punch. Further, the lower holder 2] is supported by four elevating pins 22, and each elevating pin 22 passes through the lower fixing plate 2 so as to be able to rise and fall freely. The fourth lower punch 18 is fixed to the lower fixed plate 2 and constitutes a fixed lower punch. Since both the lifting pin 20 of the upper holder 19 and the lifting pin 22 of the lower holder 21 pass through the lower fixing plate 2,
The lifting pins 22 of the lower holder 21 are arranged so as to penetrate between the lifting pins 20 of the upper holder 19. The lower end of the lifting pin 20 of the upper holder 19 is a disc-shaped adjusting plate 2.
3 (see FIG. 7), and its adjustment plate 23 is screwed onto the inner periphery of an adjustment ring 24. Adjustment ring 2
4 is rotatably mounted on an annular support plate 25. Further, the support plate 25 is supported by an air cylinder 27 provided between the yoke plate 1 and four ears 26 protruding from its outer periphery. Further, the lower end of the lifting pin 22 of the lower holder 21 is fixed to a similar adjusting plate 28 disposed between the adjusting ring 24 and the lower fixing plate 2 described above. The adjustment plate 28 is screwed onto the adjustment ring 29 in the same manner as described above, and is supported by the air cylinder 31 via the support plate 30. On the other hand, a lower stopper 32 and an upper stopper 33 are slidably provided on the upper surfaces of the lower fixing plate 2 and the upper fixing plate 3, respectively, at two centrally symmetrical locations. The planar positional relationship of each of these stoppers 32 and 33 is such that the positions differ by 90 degrees in the center angle, as shown in FIG. These stoppers 32, 33 are open at the top and bottom,
A roller 34 is attached to the open portion. Each of the stoppers 32 and 33 is urged toward the center by a spring 35 attached to the lower fixing plate 2 and the upper fixing plate 3, respectively, so that the inner end of the lower stopper 32 is located below the lower holder 21, and the upper stopper , 33 are located below the upper holder 19. Further, above each stopper 32, 33, a rod-shaped lower wedge 3 is provided.
6 and the lower ends of the upper wedge 37 are facing. Each of these wedges 36, 37 is fixed to the Goui plate 4, respectively. Further, a push-down pin 38 passing through the upper fixing plate 3 is fixed to the upper surface of the lower holder 21, and the push-down pin 38 faces the lower surface of the upper holder 19 at a required interval. Further, the upper surface of the upper holder 19 faces the lower surface of the Goui plate 4 with a required spacing therebetween. The relationship between the height of each of the stoppers 32 and 33 and the size of the molded product (see FIG. 3) is set as follows. That is, when the height of the upper stopper 33 is H1, the height of the lower stopper 32 is H2, the length of the outer boss 39 (see FIG. 3) of the molded product is hl, and the length of the inner boss 40 is h2, H1
These dimensions are determined so that the relationships of ≧hl+h2 and H2≧h2 hold. The reason for this determination will be described later. The structure of the embodiment of the present invention is as described above, and its operation will be explained next. First, the dimensions and shapes of the second and fourth lower punches 16.18 are determined in advance according to the shape of the molded product, and by operating each adjustment ring 24.29 and moving the air cylinder 27.31 and the lower ram 7, The heights of the first and third punches 15 and 17 are adjusted to form a cavity of a desired shape. Powder is filled in the above state, and the upper punch 12 is lowered and inserted into the die 10 to start compression. At this time,
The first lower punch 15, the third lower punch 17, and each holder 19.21 integrated therewith push down each air cylinder 27.31 and descend, and each holder 19.21 moves down each stopper 32.
．． 33 is engaged, compression is completed (see Figure 8).
. After the compression is completed, when the lower ram 7 is driven to lower the Goui plate 4, the collar portion 41 of the molded product A is pushed out. The upper wedge 37 also engages the roller 34 of the upper stopper 33 and moves it outward. As shown in FIG. 9, when the inner end of the upper stopper 33 moves outward of the upper holder 19, the lower surface of the goo plate 4 hits the shoulder of the upper holder 19, but does not push it down.
Further, the lower wedge 36 hits the roller 34 of the lower stopper 32, but the lower stopper 32 does not move. As the Goui plate 4 continues to descend further, as shown in FIG. 10, the Goui plate 4 pushes down the upper holder 19 and descends by the height hl of the outer boss 39, completing the extrusion of the outer boss 39. The lower wedge 36 is the lower stopper 3
Push the second roller 34 to move it outward. In a state in which the inner end of the lower stopper 32 moves outward from the lower holder 21, the lower surface of the upper holder 19 hits the upper end of the push-down pin 38, but this is not pushed down yet. As the goo plate 4 further descends, the upper holder 19 pushes the push-down pin 38, and the lower holder 21, which is integrated with this, is pushed down by the height hl of the inner boss 40, as shown in FIG. 40 extrusions are completed. In the above extrusion process, the core rod 14 is
The molded product is removed as the temperature decreases. Also, in this step, the upper holder 19 is lowered into the empty space after the upper stopper 33 has moved, so the height Hl of the upper stopper 33 is determined from the sum of the lengths hl and hl of the outer boss 39 and the inner boss 40. be large, that is, as mentioned above, H1≧hl+h2
It is necessary that there is a relationship between In addition, the lower stopper 32
It is necessary that the height H2 is greater than the length hl of the inner boss 40, that is, the relationship H2≧h2 exists as described above. The embodiment described above has two fixed lower punches and a floating lower punch.
In this example, one punch is provided, but it is also possible to increase the number of lower punches by one, making the total number of lower punches six. That is, a third stage fixed plate □ is provided on the upper fixed plate 3 in FIG. 6 via a block, and a □ holder for the third floating lower punch is interposed above it. In this case, a total of six wedges are provided on the gou plate 4 in order to move the stoppers on each fixed plate, and four of these wedges penetrate the third stage fixed plate, so there are two stages. The block that connects the fixing plate in the second row and the third fixing plate must be positioned so that it does not interfere with the passage of the four wedges. Furthermore, in the embodiment described above, the core rod 14 is attached directly to the yoke plate 1 and is pulled out from the molded product A by driving the lower ram 7', but in order to reduce the load acting on the core rod 14, Alternatively, the core rod 14 may be driven by a separate drive device independent from the lower ram 7. [Effects] As described above, in this invention, the fixed plates are stacked in multiple stages via connecting blocks, and the fixed plates at each stage receive the pressure when compressed by the fixed lower punch and the floating lower punch. , the number of lower punches can be increased without increasing the floating lower punch plate. Therefore, there is an effect that molded products having more complicated shapes than conventional ones can be manufactured without increasing the size of the apparatus. Note that if all the lower floating punches are pulled out at the same time, the pulling resistance will increase, but if the lower floating punches are pulled out in order starting from the outer peripheral side, as in the example, the pulling resistance will be reduced. .

[Brief explanation of drawings]

Figure 1: Coral; Figures 2 and 2 are cross-sectional views of conventional molded products;
3 is a sectional view of a molded article according to the present invention, FIG. 4 is a perspective view of another example of a molded article according to the present invention, FIG. 5 is a cross-sectional plan view of the embodiment, and FIG. FIG. 7 is a cross-sectional view taken along line V, FIG. 7 is a cross-sectional view taken along line - Vl in FIG. 6, and FIGS. 8 to 11 are cross-sectional views showing the operating state. 1...Yoke plate, 2...Lower fixed plate, 3
... Upper fixing plate, 4... Gui plate, 5...
・Upper punch plate, 6...Press body, 7...Lower ram, 8...Connection block, 9...Column, 1o...
・Gui, 12... Upper punch, 15... First lower punch, 16... Second lower punch, 17... Third lower punch,
18... Fourth lower punch, 19... Upper holder, 20...
...Elevating pin, 21...Lower boulder, 22...Elevating pin, 27.31...Air cylinder, 32...Lower stopper, 33...Upper stopper, 36...Lower wedge,
37...Upper wedge, 38...Pushing pin
□Figure 9Figure 10Figure 11

Claims (4)

[Claims] (1) A plurality of lower punches consisting of a combination of a fixed lower punch and a floating lower punch are provided around the core rod inserted into the molding cavity of the die, the fixed lower punch is supported by a fixed plate, and the floating lower punch is supported through a holder. In a die set for a powder forming press supported by a lower ram, a plurality of fixed lower punches and fixed plates are provided, each fixed plate is stacked vertically via a connecting block, and each fixed lower punch is connected to each other by each stage of fixed plates. A die set for powder molding press characterized by supporting. (2) Two fixed lower punches and two floating lower punches are provided, two fixed plates are provided above and below to support the fixed punches, and the holder of the floating lower punch is placed between the upper and lower fixed plates and between the upper fixed plate and the die. The die set for powder molding press according to claim 1, characterized in that the die set is provided between the die set and the plate. (3) Stoppers for regulating the descent of each holder of the floating lower punch are provided on both the upper and lower fixing plates, respectively, and the stoppers on both the upper and lower fixing plates are formed with their positions shifted by 90 degrees at the center angle of the plane. A die set for a powder molding press according to claim 1. (4) Either one of the lower holder and the upper holder is provided with a push-down pin that passes through the upper fixing plate and faces the other holder at a required distance. A die set for powder molding press described in section.