Forming device

Abstract

To suppress aggravation of molding accuracy and suitably support a slide.SOLUTION: A molding device 1 includes a slide 30, and a plurality of uprights 20 for movably supporting the slide 30 in a predetermined movement direction. Each of the uprights 20 supports the slide 30 on both side faces 23a of a guide part 23 approximately parallel to a straight line R connecting the center of the slide 30 and the center of the upright 20, in a plane perpendicular to a vertical direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a molding apparatus.

Background Art

[0002] Generally, in a molding apparatus, a material (workpiece) disposed between two molds is molded by moving a slide to which one mold is fixed with respect to a bed to which the other mold is fixed. The slide has a guide gap that allows it to slide smoothly with respect to a frame that guides its movement. Since this guide gap can cause misalignment between the two molds, it is necessary to keep it as small as possible.

[0003] However, in the case of a so-called eight-sided guide that guides the slide on two surfaces along the front-rear and left-right directions for each frame as described in Patent Document 1 (see FIG. 7(a)), the guide gap may change significantly during operation. That is, in this case, deformation of the frame and thermal deformation (e.g., thermal expansion) of the slide during loading occur substantially radially around the slide center (press center), so that the guide gap changes significantly during operation. Therefore, it is necessary to adjust the guide gap to a large initial value in anticipation of this change during operation, which may lead to a large misalignment between the two molds and a deterioration in molding accuracy.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to suppress deterioration of molding accuracy and suitably support a slide.

Means for Solving the Problems

[0006] The molding apparatus according to the present invention a slide, a plurality of columns that support the slide so as to be movable in a predetermined moving direction, A supported member attached to the slide, and are provided with Each of the plurality of columns supports the slide with a plurality of support surfaces substantially parallel to a straight line connecting the center of the slide and the center of the column in a plane orthogonal to the moving direction 、 One surface of the supported member is supported by the support surface, and the surface opposite to the surface facing the support surface is spherically supported.

Advantages of the Invention

[0007] According to the present invention, it is possible to suitably support the slide while suppressing deterioration of molding accuracy.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0010] [Overall Configuration of the Molding Apparatus] FIG. 1 is a diagram showing a molding apparatus 1 according to the present embodiment. As shown in this figure, the molding apparatus 1 according to the present embodiment is a press apparatus that drives a slide to mold a workpiece. Specifically, the molding apparatus 1 includes a crown 11, a bed 12, a plurality (four in this embodiment) of uprights 20 erected between them, and a slide 30. In the following description, front and rear, left and right, and up and down refer to the directions shown in the figure.

[0011] The crown 11, the bed 12, and the plurality of uprights 20 constitute the frame 10 of the molding apparatus 1. A tie rod 21 is inserted into the crown 11, the bed 12, and the plurality of uprights 20, and they are fastened to each other by being tightened by a tie rod nut 22. The upright 20 corresponds to an example of a column according to the present invention.

[0012] A bolster 13 is fixed on the bed 12, and a lower mold 14 is fixed on the upper part of the bolster 13. A cylinder 15 is provided on the crown 11, and a slide 30 is fixed to the cylinder 15. The slide 30 is supported by the plurality of uprights 20 so as to be able to advance and retreat (move) in the vertical direction. Details of the support structure of the slide 30 will be described later. An upper mold 16 is fixed to the lower part of the slide 30. When the cylinder 15 extends, the slide 30 descends, and the workpiece is pressed and molded by the upper mold 16 and the lower mold 14.

[0013] [Support Structure of the Slide] FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 3(a) is a perspective view of the periphery of a guide portion 23, which will be described later, of the upright 20, and FIG. 3(b) is a cross-sectional view taken along line III-III of FIG. 3(a). FIGS. 4(a) and (b) are diagrams showing the attachment structure between the slide 30 and a gib block 32, which will be described later. As described above, the slide 30 is supported by the four uprights 20 so as to be movable in the moving direction along the vertical direction. As shown in FIGS. 2 and 3(a) and (b), the four uprights 20 are erected at the four corners of the diagonally front, rear, left, and right with respect to the press central axis Ax along the vertical direction, with substantially equal intervals therebetween. The cross-sectional shape of each upright 20 in a plane orthogonal to the vertical direction is symmetric with respect to a straight line R connecting the press central axis Ax and the center of the upright 20 (the center of the tie rod 21 in this embodiment). However, this shape does not have to be a perfect line-symmetric shape, and a substantially line-symmetric shape is sufficient. For example, when the dimension between the left and right tie rods 21 is set to 1, the shape is a substantially line-symmetric shape when the dimension between the front and rear tie rods 21 is within the range of 0.7 to 1.3. In the following description, the direction perpendicular to the press central axis Ax is referred to as the "radial direction", and the rotational direction around the press central axis Ax is referred to as the "circumferential direction".

[0014] Each upright 20 has a guide portion 23 on the inner diameter side (radial inner side) surface thereof for guiding the slide 30. The guide portion 23 extends in the vertical direction over a range slightly longer than the movement range of the slide 30 at a height position slightly above the center of each upright 20. The guide portion 23 is provided so as to protrude from the inner diameter side surface of the upright 20 and has both side surfaces 23a which are support surfaces for supporting the slide 30. These both side surfaces 23a are planes substantially parallel to the straight line R in a plane orthogonal to the vertical direction, and in this embodiment, are planes substantially parallel to the plane including the press central axis Ax and the center of the upright 20. The distance between the both side surfaces 23a, that is, the guide width G, is equal to or less than the diameter D of the tie rod 21. The diameter D of the tie rod 21 is defined according to the rated load of the molding apparatus 1, and is about 300 mm for a rated load of 300 ton and about 450 mm for a rated load of 6000 ton. The portion of the guide portion 23 between the two side surfaces 23a is solid so that the two side surfaces 23a are less likely to deform. That is, the space 20a in the upright 20 into which the tie rod 21 is inserted is formed on the outer diameter side (radial outside) of the guide portion 23 (the portion between the two side surfaces 23a).

[0015] As shown in FIGS. 4(a) and 4(b), the slide 30 is formed in a rectangular plate shape that is substantially square in plan view, and is arranged so as to be orthogonal to the press center axis Ax with its center coinciding with the press center axis Ax. Four gib blocks 32 are detachably attached to the four corners of the slide 30 diagonally in the front, rear, left, and right directions. The four gib blocks 32 correspond to the four uprights 20 and are arranged between the corresponding uprights 20 and the slide 30. Also, as shown in FIG. 2, the width (maximum width) Ws of the slide 30 in the left - right (or front - rear) direction is smaller than the distance Wu between adjacent uprights 20 in this direction. Therefore, the slide 30 can pass between adjacent uprights 20 in a state where the four gib blocks 32 are removed. Note that the width Ws of the slide 30 and the distance Wu between the uprights 20 do not have to be the lengths in the corresponding directions. As long as at least one of the distances between any adjacent uprights 20 is larger than the width (maximum width) of the slide 30 in a state where all the gib blocks 32 are removed, it is sufficient.

[0016] As shown in FIGS. 3(a) and 3(b), a return cylinder 17 is fixed to the upper surface of each gib block 32. The rod tip of the return cylinder 17 is fixed to the crown 11. When the return cylinder 17 extends, the slide 30 rises and the upper die 16 separates from the workpiece. Note that the return cylinder 17 may be provided at other locations. Alternatively, without providing the return cylinder 17, the slide 30 may be raised by the contraction of the cylinder 15.

[0017] Each gib block 32 has a U-shaped recess 32a on the outer diameter side surface in plan view. Each gib block 32 can move relative to the guide portion 23 in the vertical direction by fitting the recess 32a with the guide portion 23 of the upright 20 in the radial direction. Among the respective gib blocks 32, a plurality of sliding units 40 that slide on the guide portion 23 of the upright 20 are attached to both side walls 321 of the recess 32a. In the present embodiment, four sliding units 40 are arranged along the vertical direction for each side wall 321.

[0018] FIG. 5 is a cross-sectional view of the sliding unit 40. The sliding unit 40 extends substantially along the T direction orthogonal to the straight line R in a plane orthogonal to the vertical direction. Hereinafter, among the T directions, the side closer to the guide portion 23 of the upright 20 is referred to as the "one end side", and the side farther from the guide portion 23 is referred to as the "other end side". Specifically, as shown in FIG. 5, the sliding unit 40 has a substantially cylindrical case member 41. The case member 41 is fixed to the side wall 321 of the gib block 32. A shaft member 42 is inserted into the case member 41 from the one end side. The tip of the shaft member 42 on the other end side is exposed from the case member 41, and is fastened and fixed to the case member 41 by a large nut 43 screwed to the tip. Further, the shaft member 42 is biased toward the one end side with respect to the case member 41 by an elastic member 44 housed inside the case member 41. The elastic member 44 may be any member that elastically supports a spherical member 46 described later via the shaft member 42, and may be a spring member or may be a metal having a relatively low hardness.

[0019] A bolt 45 is inserted into the shaft member 42. The tip of the bolt 45 on the other end side is exposed from the shaft member 42, and is fastened and fixed to the shaft member 42 by a small nut 48 screwed to the tip. However, an elastic member 49 (a disc spring in the present embodiment) is sandwiched between the small nut 48 and the end face of the shaft member 42, and relative movement between the shaft member 42 and the bolt 45 is allowed within the range where the elastic force acts.

[0020] A spherical member 46 is fixed to the tip of one end side of the bolt 45. The spherical member 46 is supported by the guide portion 23 and is an example of the supported member according to the present invention. The surface on the other end side of the spherical member 46 is formed in a spherical shape and is supported (i.e., spherically supported) by the surface on one end side of the shaft member 42 formed in a corresponding spherical shape and capable of relative movement (sliding) with each other. A sliding member 47 that slides on the guide portion 23 (side surface 23a thereof) is attached to the surface on one end side of the spherical member 46. The sliding member 47 is made of a material (such as a copper alloy) softer than the guide portion 23 of the upright 20. In the present embodiment, the guide gap S between the sliding member 47 and the side surface 23a of the guide portion 23 is adjusted to about 0.1 mm. Further, a groove (not shown) for interposing a lubricant (grease) is formed on the surface on one end side of the sliding member 47 between the sliding member 47 and the side surface 23a of the guide portion 23.

[0021] [Technical Effects of the Present Embodiment] As described above, according to the present embodiment, each upright 20 supports the slide 30 by two support surfaces (both side surfaces 23a of the guide portion 23) that are substantially parallel to the straight line R connecting the press central axis Ax and the center of the upright 20 in a plane orthogonal to the vertical direction. That is, as shown in FIG. 6, the deformation of the frame 10 (upright 20) during loading occurs in a substantially radial shape centered on the press central axis Ax, and the thermal deformation (such as thermal expansion) of the slide 30 also occurs in a substantially radial shape. The directions of these deformations and the both side surfaces 23a of the guide portion 23 that are the support surfaces are substantially parallel. Thereby, unlike the case of the eight-sided guide as shown in FIG. 7(a), the change in the guide gap S during operation can be suppressed, and thus the initial value of the guide gap S at the time of assembly can be set small. Therefore, it is possible to suitably support the slide 30 while suppressing the displacement of the molds 14 and 16 and suppressing the deterioration of the molding accuracy.

[0022] Further, according to the present embodiment, since both side surfaces 23a of the guide portion 23, which is the support surface in each upright 20, face in opposite directions, the load in the circumferential direction around the press central axis Ax can be preferably supported. That is, depending on the shape of the mold and the like, a reaction force in the circumferential direction around the press central axis Ax may act on the slide 30 during molding. In the case of an X-type guide that guides the slide on one surface facing the slide center for each frame as shown in FIG. 7(b), although the above-described thermal deformation can be suppressed, this circumferential load cannot be received by all the support surfaces. For example, when a clockwise load in FIG. 7(b) acts on the slide, only the upper right and lower left support surfaces in the figure receive this load, and the surface pressure increases compared to the case where it is received by all the support surfaces. On the other hand, in the present embodiment, since the slide 30 is supported by both side surfaces 23a of the guide portion 23 facing in opposite directions, any circumferential load in any direction can be supported by one support surface for each frame 10 (upright 20). Therefore, the slide 30 can be supported more preferably.

[0023] Further, according to the present embodiment, since the portion between both side surfaces 23a of the guide portion 23 in each upright 20 is solid, deformation of the side surface 23a can be suppressed compared to the case where the portion is hollow. Therefore, even when the slide 30 and the upright 20 receive a load, the slide 30 can be guided more accurately.

[0024] Further, according to the present embodiment, both side surfaces 23a of the guide portion 23 are provided in the inner diameter side portion of each upright 20. Thereby, the guide width G can be made smaller compared to the case where both side surfaces 23a (guide portion 23) are provided on the side portion of the upright 20. As a result, the machining accuracy of both side surfaces 23a can be improved, and the guide gap S can be set smaller with higher precision.

[0025] Further, according to the present embodiment, the spherical member 46 supported by the side surface 23a of the guide portion 23 is spherically supported on the surface opposite to the guide portion 23. As a result, regardless of whether it is during assembly or operation, the spherical member 46 changes its inclination so as to follow any deformation in any direction of the side surface 23a of the guide portion 23. Therefore, the slide 30 can be supported more suitably. In addition, the machining accuracy such as flatness and parallelism required for the side surface 23a of the guide portion 23 can be relaxed.

[0026] Further, according to the present embodiment, since the spherical member 46 is supported by the elastic member 44 disposed on the side opposite to the side surface 23a of the guide portion 23, the initial value of the guide gap S during assembly can be set smaller. For example, the initial value of this guide gap S can be set to zero, and further preload can be applied.

[0027] Further, according to the present embodiment, each upright 20 is formed in a line-symmetric shape with respect to a straight line R connecting the press central axis Ax and the center of the upright 20 in a plane orthogonal to the vertical direction. Thereby, deformation of the guide gap S due to load and heat can be more reliably suppressed.

[0028] Further, according to the present embodiment, the distance Wu between adjacent ones of the four uprights 20 is larger than the width Ws of the slide 30 in a state where the four gib blocks 32 are removed. As a result, in a state where the four gib blocks 32 are removed, the slide 30 can be passed between the uprights 20. Therefore, the slide 30 and the gib blocks 32 can be taken out of the frame 10 or incorporated into the frame 10 without disassembling the frame 10.

[0029] [Others] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, in the above embodiment, the concave portion 32a of each gib block 32 is fitted to the guide portion 23 protruding from each upright 20, but the relationship between the convex and concave portions may be reversed. That is, as shown in FIG. 8, instead of the concave portion 32a, each gib block 32 may be provided with a convex guide portion 33 on the outer diameter side, and each upright 20 may be provided with a concave portion 24a on the inner diameter side instead of the guide portion 23. Then, the guide portion 33 of each gib block 32 and the concave portion 24a of each upright 20 may be fitted together. Even in this case, the sliding unit 40 is provided on the gib block 32 (slide side) (for example, built into the guide portion 33). However, the sliding unit 40 may be provided on the upright 20 (for example, attached to the side wall 24 of the concave portion 24a and slid with both side surfaces of the guide portion 33).

[0030] In the above embodiment, each upright 20 has both side surfaces 23a of the guide portion 23 as two support surfaces facing in opposite directions, but it may have three or more support surfaces including such two support surfaces.

[0031] In the above embodiment, four uprights 20 are arranged at equal intervals in the front, rear, left, and right directions, but the arrangement is not limited to this. For example, the intervals between the front and rear and between the left and right of the four uprights 20 may be different. Also, if there are a plurality of uprights 20, the quantity is not limited.

[0032] In the above embodiment, a plurality of uprights 20 erected in the vertical direction support the slide 30, but the plurality of columns according to the present invention may support the slide so as to be movable in a predetermined moving direction. That is, the extending direction of the plurality of columns and the moving direction of the slide do not have to be in the vertical direction.

[0033] In the above embodiment, a press device is described as an example of the molding device, but the molding device according to the present invention is not limited to a press device as long as it is equipped with a moving slide and performs molding, and is applicable to, for example, an injection molding device. In addition, the details shown in the above embodiments can be appropriately changed without departing from the gist of the invention.

Explanation of Signs

[0034] 1 Molding device 10 Frame 11 Crown 12 Bed 20 Upright (pillar) 21 Tie rod 23 Guide part 23a Side surface (support surface) 30 Slide 32 Gib block 32a Recess 321 Side wall 40 Sliding unit 42 Shaft member 44 Elastic member 46 Spherical surface member (member to be supported) 47 Sliding member Ax Press center axis D Diameter of tie rod G Guide width R Straight line S Guide clearance Ws Width of slide Wu Distance between uprights

Claims

1. A slide, a plurality of columns that support the slide so as to be movable in a predetermined moving direction, a supported member attached to the slide, comprising: each of the plurality of columns supports the slide with a plurality of support surfaces that are substantially parallel to a straight line connecting the center of the slide and the center of the column in a plane orthogonal to the moving direction, the supported member has one surface supported by the support surface and the surface opposite to the surface facing the support surface is spherically supported, a molding apparatus.

2. The plurality of support surfaces include two support surfaces facing in opposite directions, The molding apparatus according to Claim 1.

3. Each of the plurality of columns has a solid portion between the two support surfaces, The molding apparatus according to Claim 2.

4. The two support surfaces are provided at a portion closer to the center of the slide in the plane orthogonal to the moving direction among each of the plurality of columns, The molding apparatus according to Claim 2 or Claim 3.

5. The supported member is supported by an elastic member disposed on the side opposite to the support surface, The molding apparatus according to any one of Claims 1 to 4.

6. Each of the plurality of columns is formed in a substantially line-symmetric shape with respect to the straight line in a plane orthogonal to the moving direction, The molding apparatus according to any one of Claims 1 to 5.

7. Comprising a plurality of gib blocks detachably attached to the slide and disposed between the plurality of columns and the slide, at least one of the distances between adjacent ones of the plurality of columns is larger than the width of the slide in a state where the plurality of gib blocks are removed, The molding apparatus according to any one of Claims 1 to 6.

8. A slide, a plurality of columns that support the slide so as to be movable in a predetermined moving direction, a plurality of gib blocks detachably attached to the slide and disposed between the plurality of columns and the slide, comprising: each of the plurality of columns, supports the slide with a plurality of support surfaces that are substantially parallel to a straight line connecting the center of the slide and the center of the column in a plane orthogonal to the moving direction, the surfaces facing adjacent ones are formed in a planar shape orthogonal to a straight line directed toward the adjacent one in a plane orthogonal to the moving direction, at least one of the distances between adjacent ones of the plurality of columns is larger than the width of the slide in a state where the plurality of gib blocks are removed, a molding apparatus.

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