JPH069759B2 - Heat deformation absorption guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention relates to a platen or a slide that is vertically movable on a tie rod that is erected at each corner of a quadrangle of a frame of a molding machine or a press machine. The present invention relates to a thermal deformation absorption guide provided on a tie rod portion that escapes thermal deformation so as to be freely expanded by generated heat and can withstand an unbalanced load without tilting the platen or slide.

“Prior Art” Conventionally, when guiding a slide that moves up and down in a press or a mechanical frame similar to this, thermal deformation generated in the slide due to heat generated by processing escapes at a guide portion. For example, a device for guiding a ram into a mechanical frame of a punch press or the like, which is known from Japanese Patent Publication No. Sho 55-16760, has four corners of a substantially rectangular frame 6 as shown in FIG. Place the individual guide 1,
Four guide columns 3 provided at the four corners of the ram 2 of the press
, A guide body 4 having a guide surface facing the point A or B parallel to the diagonal line of the ram 2 is provided so as to be able to move up and down, and a holder 5 for guiding the guide body in the diagonal direction is provided on the guide 1 so that the ram 2 is deformed by thermal expansion. To escape in the SA, SB, SC, SD direction,
Moreover, the distance between the points AB is made as short as possible or set to zero, and the guides are fixed according to the difference in the shape of the ram 2. The other examples also have fixed guides.

[Problems to be Solved by the Invention] In the above-mentioned conventional device, the guides are fixedly installed in a direction substantially diagonal to the ram, but there is a problem in that the guides are fixedly provided. That is, as shown in FIGS. 6a and 6b,
Although the die attached to the ram is a large heat source, the die 7'is deformed as shown in Fig. B with respect to the deformation direction α of the ram 2 when the die 7 is at the center of the ram 2 as shown in a diagram. Is different in the front-back direction of the ram 2, the ram deformation direction α ₁ is different.

Therefore, since the holder 5 of the guide 1 shown in FIG. 5 is fixedly provided in a fixed direction to guide the guide column 3 and the guide body 4, there is a disadvantage that excessive stress is generated and the precision of the press is lowered.

"Object of the invention" The object of the present invention is to eliminate this drawback, and even if the direction of deformation of the platen or the slide is changed by different heat sources, the thermal deformation can be guided by changing the escape direction correspondingly. To provide an absorption guide.

"Means and Actions for Solving Problems" According to the configuration of the present invention, tie rods are provided which penetrate the four corners of a platen having a rectangular horizontal plane shape in which an upper die is attached to a lower surface thereof and is moved up and down toward a lower die. A cylindrical spacer is slidably provided on the tie rod so as to correspond to the platen, and a guide surface is formed at the upper part of the spacer with the outer peripheral part facing away from the spacer in a direction perpendicular to the center of the spacer, and at the lower part. A flange with the required thickness is projected, and on the inner peripheral surface of the platen upper part that is concentric with the tie rods, radial bearings that correspond to the top and bottom of the guide surface of the spacer are supported, or the bush inner ring is rotatably supported and the inner diameter of the inner ring Between the outer diameter of the spacer and the outer diameter of the spacer, a clearance necessary to escape thermal deformation is provided, and the inner ring is a guide in which the tip is slidably abutted against the guide surface of the spacer. Two holders, which are the surfaces, are projected, and the bottom of the platen is provided with holes with the inner diameter of the spacer flange and the clearance necessary to escape thermal deformation. It is characterized in that it is slidably guided in a horizontal plane by a nut screwed to the screw of the hole opening. If the guide surfaces of the spacers at the four corners are installed so that the diagonal directions of the platen are almost oriented, the inner ring will rotate so that the holder guide surface and the spacer guide surface match the direction of the platen thermal deformation. However, even if the direction of thermal deformation changes, the platen can be guided up and down freely on the guide rod.

"Embodiment" FIGS. 1 and 2 show the structure of the thermal deformation absorption guides 9 of the present invention provided at the four corners of the platen 8 of the molding machine.

Tie rods 10 are provided vertically through the four corners of the platen 8, and cylindrical spacers 11 are swingably fitted to the outer periphery of the tie rod 10 in correspondence with the platen 8. On the outer periphery of the spacer 11, horizontal guide surfaces 12, 12 are provided in the upper portion in a direction perpendicular to the axis and in a direction substantially diagonal to the platen 8, and a flange 13 having a required outer diameter and thickness is provided in the lower portion. ing. Washers 14, 14 are attached to the upper and lower surfaces of the flange 13, and the upper and lower surfaces thereof serve as sliding surfaces.

The platen 8 is provided with a through hole 8A that is concentric with the spacer 11 and has a small diameter in the middle and a large diameter in the upper and lower portions that open to the upper and lower surfaces. Two radial bearings 15 are provided above and below the guide surface 12 of the spacer 11 above the through hole 8A.
This bearing 1 is fitted with 15 and secured with a lid 15A.
5, a cylindrical inner ring 16 having a sufficient clearance between itself and the outer periphery of the spacer 11 to escape thermal deformation of the platen 8 is rotatably supported. Holders 17 having guide surfaces 17A that oppose the guide surfaces 12, 12 of the spacer 11 and slidably abut against the inner ring 16 are provided at 180 ° intervals on the outer peripheral portion, and are attached by bolts 17B. The window 8 for attaching the holders 17, 17 to the platen 8
B and 8B are provided.

The intermediate portion of the through hole 8A is provided with a required distance from the outer periphery of the spacer 11 and forms a stepped portion for receiving the upper surface of the washer 14 of the flange 13 with the large diameter lower portion. A sufficient clearance is provided between the inner diameter of the lower large diameter portion and the outer circumference of the flange 13 to escape thermal deformation of the platen 8. A screw is provided in an opening below the through hole 8A, and a nut 18 is screwed in, and a flange 13 having a washer 14 attached is slidably guided in a horizontal plane between an upper surface of the nut 18 and a step.

Therefore, the platen 8 is guided up and down with respect to the tie rod 10, and when thermal deformation occurs, the inner ring 16 is rotated so that the guide surface 17A of the holder 17 and the guide surface 12 of the spacer 11 face in the direction of deformation. The surface 17A and the guide surface 12 slide to absorb thermal deformation.

The platen 8 is connected to a piston rod of a hydraulic cylinder 19 which will be described later and is driven up and down.

FIGS. 3 and 4 show a molding machine 20 in which the platen 8 according to the embodiment is guided up and down by four tie rods 10 at each corner of a quadrangle. A bottom plate 21 and a top plate 22 are kept parallel to each other on a frame of the molding machine 20 by columns 23, and tightly fastened by four tie rods 10. A hydraulic cylinder 19 is fixed downward on the upper surface of the upper plate 22, and its piston rod is connected to the platen 8.
An injection device 24 that heats and melts and ejects a plastic material is provided below the lower plate 21, and the molten plastic is injected from the injection device 24 into a mold (not shown) attached to the lower surface of the platen 8 and the upper surface of the lower plate 21. Then, the hydraulic cylinder 19 pressurizes and molds. The thermal deformation of the platen 8 due to the heat of the die is absorbed as described above, and the displacement of the tie rod 10 in the deformation direction due to the thermal deformation of the lower plate 21 similarly causes the spacer 11 of the thermal deformation absorption guide 9 to be slightly inclined in the deformation direction. Can be absorbed by

[Advantages of the Invention] As is clear from the above description, according to the present invention, even if the shape of the heating element (mold) is different and the direction of thermal deformation of the platen changes, the thermal deformation can be absorbed. Since the center of the platen does not shift, the parallelism can be maintained, so that the machining accuracy does not decrease. Even if the tie rod slightly tilts in the direction of thermal deformation due to thermal deformation of the lower plate, it can be absorbed at the same time. The platen misalignment due to an unbalanced load can be prevented by the interaction of the four guides. Since the guides are separately attached and assembled, if the centers of the holes of the two upper and lower plates match, the center of the holes of the platen may be slightly deviated, which facilitates processing. It can also be used as a slide guide for a press. The practical effects and advantages are great.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a platen according to the embodiment, FIG. 2 is a II-II sectional view of FIG. 1, FIG. 3 is a front view of a molding machine according to the embodiment, and FIG. 4 is a right side surface of the essential part. 5 and FIG. 5 are plan views of main parts for explaining a conventional example, FIGS. 6a and 6b are heat deformation explanatory views of the conventional example, 1 is a guide, 2 is a ram, 3 is a guide column, 4 is a guide body, 5 Is a holder, 6 is a frame, 7 is a mold, 8 is a platen, 9 is a heat deformation absorption guide, 10 is a tie rod, 11
Is a spacer, 12 is a guide surface, 13 is a flange, 14 is a washer, 15 is a radial bearing, 16 is an inner ring, 1
7 is a holder, 18 is a nut, 19 is a hydraulic cylinder, 20
Is a molding machine, 21 is a bottom plate, 22 is a top plate, 23 is a column, and 24 is an injection device.

Claims (1)

[Claims] 1. A tie rod that vertically penetrates each corner of a platen of a molding machine and is slidably provided at a position corresponding to the platen of the tie rod, and its outer periphery is oriented in a direction perpendicular to the center of the spacer and in a substantially diagonal direction of the platen. Cylindrical spacers having guide surfaces cut out in parallel to each other, an inner ring rotatably provided in the through hole of the platen and having a required clearance from the outer circumference of the spacer, and fixed to the inner ring, and fixed to the guide surface. A heat deformation absorption guide, comprising: a holder having a flat portion slidably in contact with the holder, the revolution of which is restricted about the center of the inner ring.