JPH0556240B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention consists of dividing the frame of a press into a bed, a column, and a crown, and tightening these with tie rods to create a tie rod type frame structure.The slide of the press is raised and lowered using the column as a guide. The present invention relates to a slide guide for a press suitable for use in a press.

``Prior Art'' Conventionally, the slide of a press with a tie-rod frame structure has vertical gibs provided at the four corners of the slide and the opposing column, and the slide is raised and lowered by appropriately adjusting the gap between the gibs. was.

"Problems to be Solved by the Invention" The conventional slide guide described above can accurately guide the slide up and down when no load is applied to the slide of the press. However, when a material is pressed using an upper die attached to the slide of the press and a lower die attached to the bolster, a large upward force acts on the center of the slide, and the slide receives bending stress and bends. arise. This tendency is particularly noticeable in transfer presses where the slide is long from side to side, as a two-point type press in which both the left and right ends of the slide are driven by a crankshaft is often used. The deflection of the slide is such that the top side of the slide is extended and the bottom side is compressed, so the column deforms outward at the top side of the slide, and the gap between the slide and column widens at the flexible area, resulting in insufficient guidance. The machining accuracy of the press decreases, and the wear of the gib becomes uneven, shortening its life.

The object of the present invention is to eliminate these drawbacks, to allow the gib to follow the deformation caused by the bending stress of the slide, to maintain the gap between the slide side gib and the column side gib almost constant at all times, and to improve the machining accuracy of the press. Our objective is to provide a slide guide for presses that can be maintained and extend the life of the give.

"Means and effects for solving the problems" The structure of the present invention is such that a fixed gib having a concave orthogonal surface facing inward in the front-back direction and the left-right direction is attached to the column corresponding to the four corners of the slide of the press in the vertical direction. At the four corners of the slide, there is a movable gib that has perpendicular surfaces that touch the fixed gib and has almost the entire height of the slide in the vertical direction. It is characterized by providing a gib holding pin that penetrates in the front and back direction and is fixed to the front and rear surfaces of the slide and rotatably holds the movable gib. Therefore, the slide moves up and down with the movable gib guided by the fixed gib of the column, and when the center part of the slide in the left and right direction is pushed up due to the stress of press working and bends due to bending stress, the movable gib rotates according to the deformation. However, the gap between the movable gib and the fixed gib can always be maintained substantially constant, and the column will not be deformed.

"Example" In FIGS. 1 and 2, the structure of a slide guide of the present invention provided in a press 1 is shown. The press 1 has a tie rod type frame structure in which four columns 3 are erected at the front and back on both left and right sides of a bed 2 when viewed from the front, a crown 4 is mounted on the columns 3, and the columns are tightened from above and below with tie rods 5. As shown in Fig. 2, the slide 6 is long in the left and right directions, and is connected to the eccentric part of a crankshaft (not shown) at two points, at points 7 on both the left and right ends, by connecting rods, and is driven up and down by the rotation of the crankshaft. .

Movable gibs 8 are provided at the four corners of the slide 6 along the front and rear surfaces of the slide 6, extending over almost the entire vertical length of the slide 6, and fixed gibs 9 corresponding to the movable gibs 8 are provided in each column 3. ing. The movable gib 8 is provided with sliding pads 10 whose protruding surfaces facing outward in the left-right direction and the front-rear direction are orthogonal to the outside of the four corners of the slide 6. It is rotatably fixed with a holding pin 11. The fixed gib 9 is formed with a concave orthogonal sliding surface that corresponds to the sliding pad 10 of the movable gib 8 from the outside in the left-right direction and the front-back direction, and the liner 12 is directly attached to the column 3 in the left-right direction by screws or the like. fixed,
The liner 13 is fixed with a holding pin 14 in the front-rear direction. These structures are arranged symmetrically about the center line CL shown in FIG.

Next, the operation will be described with reference to FIG. When the press 1 is operated for press processing and the slide 6 reaches the bottom dead center (lower limit) indicated by the dashed line, the load F from the press processing acts on the center of the lower surface of the slide 6, and the slide 6 moves to the center in the left-right direction. is subjected to bending stress in a shape that is pushed up by the amount of deflection a.

Accordingly, the upper part of the slide 6 attempts to deform the column 3 by projecting outward in the left-right direction by a displacement amount b. Further, the lower part of the slide 6 is pulled inward in the left-right direction by a displacement amount c to try to widen the gap between the sliding pad 10 and the liner 12. At this time, the movable gib 8 rotates around the gib holding pin 11 and operates to compensate for the displacements b and c, thereby maintaining the gap between the sliding pad 10 and the liner 12 at an optimum level. When the bending stress is removed, the movable gib 8 automatically returns along the fixed gib 9. Therefore, since the gap between the movable gib 8 and the fixed gib 9 is maintained appropriately over the entire range of the lifting stroke of the slide 6, the lifting movement of the slide 6 is accurately guided in the vertical direction, and the machining accuracy of the press is maintained well. Ru.

"Effects of the Invention" As is clear from the above description, according to the present invention, the movable gib is provided corresponding to the direction in which the bending stress to which the slide is subjected is large, so that the gap between the column and the fixed gib is reduced to It can be kept almost constant regardless of the presence or absence of. Therefore, it is possible to reliably guide the slide up and down, thereby preventing a decrease in processing accuracy and improving product accuracy. Furthermore, since the column is not deformed due to bending stress of the slide, wear of the slide gib can be reduced and its life can be extended. In other words, since no forced contact occurs between the slide gibs, it is suitable for high-speed operation of the press. The practical effects and benefits are great.

[Brief explanation of the drawing]

FIG. 1 is a front view of the press waist portion according to the embodiment, and FIG. 2 is a cross-sectional view taken from FIG. 1. 1 is a press, 2 is a bed, 3 is a column, 4 is a crown, 5 is a tie rod, 6 is a slide, 7 is a point part, 8 is a movable gib, 9 is a fixed gib, 10 is a sliding pad, 11 is a gib holding pin , 12 is a liner, 13 is a liner, and 14 is a holding pin.

Claims (1)

[Scope of Claims] 1. In a slide guide for a press having a tie-rod frame structure, the slide guide is provided vertically along the front and rear surfaces of the four corners of the slide over almost the entire height of the slide, and is provided along the front and rear surfaces of the four corners of the slide, and extends in the left-right and front-back directions of the press. a movable gib having an outwardly protruding orthogonal sliding surface; a gib holding pin that passes through the vertical center of the movable gib in the front-rear direction and holds the movable gib so as to be rotatable in a sliding manner; A slide guide for a press, comprising: a concave orthogonal sliding surface facing the sliding surface of the press having a predetermined length in the vertical direction; and a fixed gib provided on each column.