JPH0739098B2 - Mold clamping device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold clamping device applicable to an injection molding machine, a press machine or the like.

(Prior Art) FIGS. 9 to 12 show an example of a conventional mold clamping device. In the figure, 1 is a fixed die plate, 2 is a tie bar, 3 is a clamping side fixing plate, 4 is a mold clamping cylinder, and 5 is a base. A moving die plate 6 moves on the base 5 by the operation of the mold clamping cylinder 4. The movable die plate 6 has a shape as shown in FIGS. 10 and 11, and is supported on a liner 20 laid on the base 5 via a roller 7 provided below the tie bar 2 without being suspended. Has been done. A recess 8 having a bottom surface inclined in the moving direction is formed in the lower part of the moving die plate 6, and the recess 8 carries the roller 7 and has the same slope to contact the bottom surface. An adjustment block 9 having a surface is fitted in the recess edge and leaving an appropriate gap.

Further, adjustment bolts 10 and 11 penetrating the concave edge of the adjustment block 9 are provided on both end surfaces of the adjustment block 9, and the position of the adjustment block 9 is determined by the bolts 10 and 11, and as a result, the moving die plate 6 is moved. The height in the up-and-down direction is finely adjusted. 12
Reference numerals 13 and 13 are adjusting nuts screwed onto the bolts 10 and 11. Further, on both side surfaces of the lower portion of the movable die plate 6, adjustment blocks 14 and 15 which are attached with contact surfaces inclined with respect to each other are provided. Guide rollers 16 and 17 rotatably supported by the adjusting blocks 14 and 15 are in contact with guide plates 18 and 19 laid on the base 5 in parallel with the tie bars 2. Therefore, by moving the adjustment blocks 14 and 15 left and right,
The lateral position of the movable die plate 6 is finely adjusted. The movable die plate 6 thus positioned in the vertical and horizontal directions moves on the base 5 by the operation of the mold clamping cylinder 4.

(Problems to be Solved by the Invention) In the conventional mold clamping device, when the movable die plate 6 is guided by the roller 7 to move forward and backward, in addition to the roller 7 provided below the movable die plate 6, the movable die plate 6 is moved. Guide rollers 16 and 17 are additionally required on both side surfaces of the moving die plate 6 for the purpose of preventing the meandering inside and adjusting the parallelism between the fixed die plate 1 and the moving die plate 6. Therefore, there are problems that a large number of parts are required for the guide mechanism and the guide portion tends to be large.

The roller 7 guides the movable die plate 6 in parallel to the floor surface, and the guide rollers 16 and 17 regulate horizontal movement (prevention of meandering) during the movement. Whether or not the movable die plate 6 can smoothly and accurately perform the forward / backward movement depends on the operation accuracy of the mold clamping cylinder 4 that moves the movable die plate 6. However, it is assumed that the stick / slip or breathing phenomenon of the mold clamping cylinder 4 is assumed. When there is a concern about vertical vibrations (lifting) due to factors such as the above, there is a problem that a guide for further restricting this is required, and the guide mechanism becomes more complicated and larger.

The present invention has been proposed to solve the above conventional problems.

(Means for Solving Problems) Therefore, according to the present invention, a fixed die plate that holds a fixed die, a movable die plate that holds a movable die, and the movable die plate are moved back and forth with respect to the fixed die plate. A mold clamping device comprising means for operating the movable die plate and a fixed die and a diver which is fixedly coupled with the fixed die plate to perform mold clamping after the movable die closes the fixed die plate. , A pair of guide rails arranged in parallel to restrict the movement of the movable die plate in the mold clamping or mold opening direction and a plurality of guide blocks moving on the respective guide rails, and the movable die plate on the respective guide blocks Supports fixedly mounted on the left and right of the legs are placed, and the supports and the guide blocks are connected to each other by one connecting pin, and the tips are connected to the guide blocks. Place the stopper bolt on the support so that it abuts the lock side surface,
The amount of rotation of each guide block with respect to the moving die plate can be adjusted by adjusting the screwing amount of the stopper bolt, and the guide block has a linear motion type incorporating a roller or a ball or a sliding guide surface. In addition, the vertical direction and the horizontal direction can be regulated at the same time, and this is a means for solving the problem.

(Operation) When the moving die plate advances to the fixed die plate side,
The tip of the tie bar penetrates through the tie bar insertion hole of the fixed die plate, and stops when the fixed mold and the moving mold come together. The parallelism between the movable die plate and the fixed die plate on the die mounting surface is extremely important, and the parallelism is adjusted by slightly rotating the movable die plate by the relative displacement between the support and the guide mounting plate.

(Embodiment) The present invention will be described below with reference to the embodiments of the drawings. Figs. 1 to 8 show an embodiment of the present invention, in which 101 is a base, 102 is a fixed die plate, and the base is fixed to one end of the base 101. In addition, the fixed mold 103 is attached. 104 is a moving die plate, to which a moving die 105 is attached. On the legs of the moving die plate, supports 106 extended in the traveling direction are attached to the left and right to balance the center of gravity, and guides are attached. It is mounted on the base 101 via the plate 107, the guide block 108, and the guide rail 109 so as to be able to move forward and backward. The supports 106 are fixed to the left and right legs of the movable die plate 104 to support the movable die plate 104. A guide block 108 is attached to the guide attachment plate 107. The guide block 108 is placed on the guide rail 109 and constitutes a linear motion type guide that can be regulated in the vertical and horizontal directions during the forward / backward movement. Guide rail 109
Is fixed on the left and right surfaces of the base 101, and serves as a guide surface for moving the movable die plate 104 forward and backward.

110 is a connecting pin that connects the guide mounting plate 107 and the support 106 to each other, and 112 is a stopper bolt that is attached to the tip ends of the left and right supports 106 and serves as a push bolt that brings the screw tips into contact with the guide mounting plate 107. Is. A tie bar 113 is fixed to the movable die plate 104 by a nut 114, and a screw 117 that meshes with the half nut 140 is provided at the tip of the tie bar. A mold opening / closing cylinder 115 is mounted between the fixed die plate 102 and the movable die plate 104, and moves the movable die plate 104 forward and backward. The screw 117 meshes with the half nut 140 provided on the back side of the fixed die plate 103 (the side opposite to the die attachment surface) during mold clamping, and is provided at the tip of the tie bar 113. 119 is a hydraulic cylinder built in the fixed die plate 102 for mold clamping and pressurization, and 120 is moved to the right in FIG. 8 by sending pressure oil to the oil chamber 122A at the time of pressurization of mold clamping, and the tip end thereof. 12
At 1, the ram 122B for generating the mold clamping force by pushing the half nut 140 already in mesh with the screw 117 of the tie bar 113 is an oil chamber. Reference numeral 130 denotes a tie bar insertion hole, which is an inner diameter portion of the ram 120 and is a hole through which the tie bar 113 is passed in order to mesh with the half nut 140 at the time of mold clamping. The half nut 140 is a nut divided into left and right members 140A and 140B into two parts. When the mold is clamped, the half nut 140 is closed by an opening / closing mechanism (not shown), meshes with the screw 117 of the tie bar 113, and is pressed by the ram 120 to clamp the mold. Is generated.

Next, the operation of the embodiment configured as described above will be described. When pressure oil is sent to the rod-side oil chamber of the mold opening / closing cylinder 115, the moving die plate 104 is guided by the guide rail 109 and advances toward the fixed die plate 102 side, and the tip of the tie bar 113 is the tie bar insertion hole 130 of the fixed die plate 102. Through the
It stops when the fixed mold 103 and the movable mold 105 come together. Also, the half nut 140 on the back side of the fixed die plate 102
Is positioned by a not-shown adjusting device up to a position where it can be meshed with the screw 117 by adjusting a slight amount of movement in the tie bar moving direction according to the die thickness. Now, when the molds are combined as described above, the left and right members 140 of the left and right half nuts 140
A and 140B are closed by an opening / closing device (not shown), and then pressure oil is sent to the oil chamber 122A on the left side of the ram 120, so that the ram 120
Moves to the right, and at the tip 121 of the half nut 140
Push to the right to generate the mold clamping force.

When opening the mold after molding is completed, the oil chamber 122A on the left side of the ram 120
Then, the half nut 140 is opened by its opening / closing device (not shown), and then the mold opening / closing cylinder 11
If pressure oil is sent to the oil chamber on the head side of 5, the moving die plate 104
Moves to the left and the mold opens.

In a mold clamping device such as an injection molding machine that repeats the operations as described above, the movable die plate 104 is placed on the base 101, and is connected to the fixed die plate 102 by one or a plurality of mold opening / closing cylinders 115. Opening / closing operation, that is, forward / backward movement is performed. In such an apparatus, the moving die plate 104
The fixed die plate 102 and the fixed die plate 102 have extremely high parallelism with respect to the die mounting surface.
104 By changing the screwing amount of the stopper bolts 112 provided at the tips of the left and right supports 106 of the legs, the movable die plate 104 can be slightly rotated by the relative displacement between the support 106 and the guide mounting plate 107 for adjustment. I can.

That is, as shown in detail in FIG. 7, left and right stopper bolts
By tightening or loosening 112, the moving die plate 104 is rotated a little. FIG. 7 shows a situation (deformed from a two-dot chain line state to a solid line state) when the stopper bolt 112 on one side is partially tightened and the other stopper bolt 112 is loosened. a, b, c, d
By this operation, is rotated to the positions of a ', b', c ', d'. At this time, the movements from a to a ′ and b to b ′ are almost only in the X-axis direction. This is because the guide mounting plate 107 is displaced in the X-axis direction together with the guide block 108, and the substantial pin coupling is performed. There is no deviation of parts. On the other hand, c → c ′, d →
The movement to d'moves a small amount in the X-axis direction, and at the same time,
Move in the Y-axis direction or more in the X-axis direction. Therefore, it is necessary that the pin connection at the points a and b is a highly accurate fit, and the pin connection at the points c and d is a slightly loose fit so as to be compatible with a predetermined rotation adjustment.

3 to 6 are views for explaining other effects of the stopper bolt 112. In a normal operation, when a rotational moment tries to act on the movable die plate 104 by some action, the tips of the two stopper bolts 112 stop it (Figs. 3 to 4). When the movable die plate 104 is deformed as shown in FIGS. 5 to 6 by some other operation, the support 106 and the guide mounting plate 107 are displaced relative to each other, and the tip of the stopper bolt 112 is fixed to the guide mounting plate 107. It is possible to prevent the guide block 108 from being subjected to a large lateral load. The guide block 108 is most compactly formed by a linear motion type bearing (rolling) in which a plurality of rollers or balls are incorporated, but of course a sliding guide surface may be used.

(Effects of the Invention) Since the present invention is configured as described in detail above,
By applying a linear motion type guide that can be regulated vertically and horizontally to the movable die plate guide, the structure of the guide can be simplified. Further, in the above-mentioned guide part, the movable die plate and the guide mounting plate to which the guide block is mounted are formed separately, and they are pin-coupled to each other at the four corners, and can be slightly rotated by a push bolt near the pin coupling at the front end. By doing so, the parallelism between the fixed die plate and the movable die plate can be adjusted relatively easily.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire mold clamping device showing an embodiment of the present invention,
2 is an exploded perspective view of the movable die plate and the guide portion in FIG. 1, FIG. 3 is a plan view of the guide portion in FIG. 1, FIG. 4 is a view taken along arrow A in FIG. 3, and FIG. Explanatory drawing of a state where the movable die plate is deformed (curved) from the state of FIG.
5 is an explanatory view showing the rotation of the moving die plate (adjustment of parallelism of the die mounting surface) by the push bolt in FIG. 5, and FIG. 8 is a view in FIG. Partial cross-sectional side view of the screw and nut in a coupled state, FIG. 9 is a side view of a conventional mold clamping device, FIG. 10 is a cross-sectional view taken along line CC of FIG. 9, and FIG. 11 is a roller portion of FIG. FIG. 12 is an enlarged side view of the guide roller portion shown in FIG. Explanation of the main parts of the figure 102 …… Fixed die plate, 103 …… Fixed die 104 …… Movable die plate, 105 …… Movable die 107 …… Guide mounting plate 108 …… Guide block 109 …… Guide rail, 110 ...... Connecting pin 112 …… Stopper bolt 113 …… Tie bar 115 …… Type open / close cylinder

Claims (2)

[Claims] 1. A fixed die plate for holding a fixed mold,
A movable die plate for holding the movable die, a means for moving the movable die plate forward and backward with respect to the fixed die plate, and the movable die plate close to the fixed die plate to close the fixed die and the movable die. After that, in the mold clamping device, which is combined with the fixed die plate and is fixed to perform mold clamping, in the mold clamping device, a pair of guide rails arranged in parallel for restricting the movement of the movable die plate in the mold clamping or mold opening direction, A plurality of guide blocks that move on each guide rail are provided, and supports fixed to the left and right legs of the moving die plate are placed on each guide block, and one support block and one guide block are provided. Connect the stopper bolt to the support so that the tip comes into contact with the side surface of the guide block, and connect the screw of the stopper bolt. The observed amount adjustment, the mold clamping apparatus being characterized in that the adjustable amount of rotation of the mobile die plate of each guide block. 2. The mold clamping device according to claim 1, wherein the guide block is configured to have a linear motion type or a sliding guide surface in which a roller or a ball is incorporated, and the guide block is movable in the vertical direction and the horizontal direction. The mold clamping device is characterized in that it can be regulated at the same time.