JPS5962128A - Clamping device for metal mold - Google Patents

Abstract

PURPOSE:To clamp molds with a small drive force in a short time by a method in which a coupling ring is provided to the periphery of a fixed mold for a fixed board, a locking cylinder is provided to a cylinder tube to be housed with a piston fitted with a movable mold, and these are coupled with each other. CONSTITUTION:The cylinder tube 24, cylinder cover 25, and cylinder body 8 of a clamping cylinder 6 and retracted in relation to a piston 23, the back face of each coupling projection 8a of the cylinder body is pressingly contacted with the front face of each coupling projection 4a of the coupling cylinder 4, and the piston 23 is moved toward the front side of the axial direction in such a way as to match the movable mold with the fixed mold 12 for fitting. By driving the cylinder 22 for driving a rack, the molds are clamped by turning the coupling ring 4 through the rack 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mold clamping device for a molding apparatus such as an injection molding machine or a casting machine.

BACKGROUND ART Conventionally, mold clamping devices for molds in molding apparatuses have generally been known to utilize a toggle mechanism, or to directly press with a hydraulic cylinder.

However, those using the above-mentioned toggle mechanism have a complex structure and expensive equipment, while those using the above-mentioned hydraulic cylinder require a large force to close the mold and require a long stroke to open and close the mold. Due to the large size, the cylinder becomes large and the hydraulic flow rate is large, and both of the above have disadvantages in that mold clamping takes a considerable amount of time.

The present invention has been made to solve the above-mentioned drawbacks, and has a simple and inexpensive structure, and can obtain a large mold clamping force with a small driving force. To provide a mold υJ mold clamping device which can release the mold clamping in a short time and very smoothly, and in particular can eliminate gouging, scratching and wear of the mold clamping part 2 when releasing the mold clamping. The purpose is to

For this reason, the present invention provides a fixed plate to which a fixed mold is fixed, a rotary means on the fixed plate which is rotatable and non-movable in the axial direction; A merging ring having retaining protrusions protruding in the radial direction with the +' placed at predetermined intervals in the circumferential direction, and a movable mold that forms a molding cavity together with the fixed mold (to accommodate the q-th piston) [Cylinder tube v] At the side end of the fixed mold, retaining protrusions are installed in the radial direction at predetermined intervals (Iiii) and by moving the mold clamping cylinder in the axial direction, the movable mold is li', +'l'," 2, is provided with a mold opening/closing cylinder that can freely approach and separate from the mold, and the mold clamping cylinder is connected to the retaining protrusion of the mold clamping cylinder and the engaging protrusion of the engaging ring. After the mold opening/closing cylinder passes between the engaging protrusions of the engaging ring in a state in which the phase is smoothed, the engaging ring is rotated by the rotating means to secure the engaging ring. The mold is clamped by aligning the protrusion with the locking protrusion of the mold clamping cylinder, causing the piston of the mold clamping cylinder to protrude, and engaging both of the engaging protrusions. It is said that

The present invention will be specifically explained below based on illustrated embodiments.

1 and 2, reference numeral 1 indicates an injection device provided in front of the base 2 in the axial direction and has a hopper 10, and 3 indicates the base 2.
4 is an engagement ring supported on the stationary plate side, 5ζ is a rotational drive device as a rotation means for rotating the engagement ring 4, and 6 is the base. A mold clamping cylinder 8 is movable back and forth in the axial direction along guide portions 7, 7 provided on both sides of the mold clamping cylinder 6.
A cylindrical body fixed to I and into which the ring 4 can be fitted; 9 is a mold opening/closing cylinder having a rod 9a whose tip end is connected to the mold clamping cylinder 6 to move the mold clamping cylinder 6 back and forth in the axial direction; be.

2. The injection device 1 supplies molding material from a hopper 10, kneads it by rotating seven cryus (not shown), passes it through a nozzle 11 and a hot spool 31, and then mixes the molding material with a fixed mold 12, which will be described later. Cavity 1 formed with movable mold 13
A molding material is injected into the molding material 4 to mold the product 15.

In addition, an annular portion 3a is provided protruding from the rear side of the second device surface plate 3θ.
7. A fixed mold support member 16 having the fixed mold 12 fixed to its rear end surface is provided inside the mold support member 16. In addition.

17+1 An ejector plate 18 provided on the fixed platen 3 and provided in front of the fixed support member in the annular portion 3a of the second device surface plate 3.
It is moved backward in the axial direction using the eject cylinder 17, and is held in the fixed mold 12 using the eject pins 19 and 19. The finished product J5 is discharged.

- Arrangement surface plate 3C・) On the outer periphery of the annular portion 3a, there is provided the above-mentioned engagement ring 4, which is rotatable around the axis but cannot be moved in the axial direction by fitting with the stepped protrusion 3b of the annular portion 3a. It is set up. The mating ring 4 has 1'9 on its axially rear outer circumferential surface.
Engagement protrusions 4a, . On the other hand, a gear portion 4C is provided on the front outer circumferential surface of the engagement ring 4 in the axial direction, and meshes with the gear portion 20a of the rotation drive device 5 provided below the retaining ring 4. .

As shown in FIG. 3, this rotary drive device 5 includes a rack 20 that is movable back and forth in a direction perpendicular to the axial direction of the base 2 under the guidance of a rack guide 21 having a concave cross-section, and one end of the rack 20. It consists of a rack driving cylinder 22 to which a rod 22a is fixed at its tip.

Then, by driving the cylinder 22, the rack 20 is moved back and forth, and the gear portion 20a of the rack 20 and the engagement ring 4 are moved back and forth.
The retaining ring 4 is rotated in forward and reverse directions through engagement with the gear portion 4C.

Furthermore, the mold clamping cylinder 6 is supported at its lower part by support members 33, 33 which are fitted on both sides into the guide grooves 7a, 7a of the guide members 7, 7, respectively, and the piston 2
3, a cylinder tube 24, and a cylinder head 25. The upper pinuton 23 has a movable bolster 26 on its front surface that integrally has a rond part 26a that extends rearward through the cylinder cover 25 and guides the axial movement of the piston 23. The movable bolster 2 is fixedly provided with a double nand 32 on the
A movable support member 27 is provided on the 4iI surface of the movable support member 27, and the upper fF' movable mold 13 is supported on the front surface of the movable support member 27. The mold 13 is brought into contact with and separated from the fixed mold J2.

The cylinder body 8 is attached to the front end of the cylinder tube 24 with a bolt 28. ..., is fixed at 28. The inner diameter of the cylindrical body 8 has a dimension to which the engagement ring 4 can be fitted, and the inner circumferential surface θ] is provided with engagement protrusions 8a+ at predetermined intervals radially inward on the front side thereof. +8a, and grooves 8b are formed between the engaging protrusions 3a, 3a, respectively. As the mold opening/closing cylinder 9 is driven forward, each engagement protrusion 8a of the cylindrical body 8 is moved to the engagement ring 4.
When the OJ engaging protrusions 4a and 4a pass through each mt41), they are passed through each port 8b of the engaging ring 40), and due to the rotation of the engaging ring 4, each engaging protrusion 8a of the cylinder 8 is The rear surface faces the front surface of each engagement protrusion 4a of the engagement ring 4.

The hydraulic chamber of the mold clamping cylinder 6 includes a rear chamber 29 surrounded by the rear surface of the piston 23, the cylinder tube 24, and the cylinder cover 25, the front surface of the piston 23, the cylinder tube 24, the movable bolster 26, and the cylinder body 8. It is divided into one chamber with an annular anterior chamber 30 surrounded by the rear part of the chamber. When the rear chamber 29 is pressurized and the front chamber 30 is depressurized, the cylinder tube 24 of the mold clamping cylinder 6, the cylinder cover 25, and the cylinder body 8 retreat with respect to the piston 23, and each engagement protrusion 8a of the cylinder body 8 moves back. The rear surface comes into pressure contact with the front surface of each engagement protrusion 4a of the engagement ring 4, and the piston 23 moves axially forward to align the movable mold 13 with the fixed mold 12 and clamp the mold, while the front surface When the chamber 30 is pressurized and the rear chamber 29 is depressurized, the mold clamping force acting between the fixed mold 12 and the movable mold 3 is released. At this time, if the pressure in the front chamber 30 is adjusted, the piston 2
3 may be moved axially rearward to separate the movable mold 13 from the fixed mold 12, thereby releasing the clamping of the mold.

On the other hand, at this time, of the pressure contact force acting between the rear surface of each engagement projection 8a of the cylinder body 8 and the front surface of each engagement projection 4a of the engagement ring 4, the portion based on the mold clamping cylinder 6 is released. or,
At this time, the mold opening/closing cylinder 9 is kept under pressure in the forward direction, and each engaging protrusion 8a of the cylinder body 8 is urged forward and moved, and as a result, the rear surface of each of the retaining protrusions 8a and each retaining protrusion 8a are pressed forward. The pressing force acting between the front surfaces of the projections 4a can be completely released.

Thereafter, the rack and the driving cylinder 22 are driven so that they face each other, and in this state, the mold opening/closing cylinder 9 is pressurized backward to open the mold.

Now, in the molding device having the above structure, each device is operated by the actuation quimming shown in FIG.

First, the mold clamping cylinder 6 is advanced by driving the mold opening/closing cylinder 9 from the open state of the mold, and the mold clamping cylinder 6 is moved forward.
The retaining protrusion 3a of the cylindrical body 8 is fixed to the cylindrical body 8.

...+8" is the engagement protrusion 4ar of the engagement ring 4...
, 4a between the grooves 4b, .

. . , 81) inside the engagement protrusion 4a+ of the engagement ring 4.
4a passes through the retaining ring until the rear surface of each engagement protrusion 8a of the barrel 8 is positioned forward of the front surface of each engagement protrusion 4a of the engagement ring 4. 4. Next, the rack drive cylinder 22 is driven to rotate the engagement ring 4 via the rack 20, so that each engagement protrusion 4a of the engagement ring 4 is attached to the rear surface of each engagement protrusion 8a of the cylinder body 8.
The front sides of the two sides are facing each other. Next, the piston 23 of the mold clamping cylinder 6 is advanced to bring the movable mold 13 into contact with the fixed mold 12, and the rear chamber 29 is further pressurized. The cylinder body 8 moves back with respect to the piston 23, and the rear surface of each engaging protrusion 8a of the cylinder body 8 comes into pressure contact with the front surface of each retaining protrusion 40), and the retainer cylinder force bar 25 is fixed in the ridge direction. In contrast, the movable mold 13 is pressed against the fixed mold side and the mold U is clamped.

After mold clamping, the injection touch cylinder C (not shown) is driven to bring the nozzle 1 into contact with the hot spool 31, and the injection cylinder (not shown) is used to press the INN type 44.
Fill the cavity 14 of the mold through the nozzle 11 and the hot spool 31. After maintaining the injection pressure of the injection cylinder for a fixed period of time θJ, the injection cylinder is reversely driven and at the same time the screw is rotated to melt and knead the molding material and prepare for the next injection. Thereafter, the nozzle 11 is separated from the hot spool 3J by reverse driving of the injection touch cylinder. Mold 0) After cooling in the cavity 14 and condensing the molding phase half, the mold clamping cylinder 6 is depressurized to release the mold clamping force, and then each engaging protrusion 8aO of the cylinder 8θ
r Each engagement protrusion 4a (b 14iJ) on the rear surface and the engagement ring 4
The pressing force acting between rl'ii Ch is released, and then the rack 2 is driven by the rank drive cylinder 22.
0, the engaging ring 4 is rotated in the opposite direction or counterclockwise, so that each of the engaging protrusions 4a, 3a has a groove 81].

41). Next, mold opening h1 IJ
The cylinder 9 is driven to move the mold clamping cylinder 6 backward, and the engaging protrusions 8a of the cylindrical body 8 are caused to pass through the engaging grooves 4b of the engaging ring 4. Engagement protrusion 4
a to release the fitting between the cylindrical body 8 and the engagement ring 4. Next, the eject cylinder 17 is operated to eject the product 15 from the fixed mold 12 using the eject pin 19°]9, and after coating both molds on the mold release side, etc., the mold opening/closing cylinder 9 is driven to remove the mold. By advancing the tightening cylinder 6 and repeating the above operation again, injection molding is performed continuously.

Note that the present invention is not limited to this example, and can be implemented in various other ways. For example, the engagement protrusions 3a, .

..., 4a may be provided on the inner circumferential surface of the engagement ring 4, and the cylindrical body 8 may be fitted into the engagement ring 41.

- As shown in Figures 5 and 6, the eject cylinder 1
7, the large eject plate 18 is made to protrude outside of the retaining ring 4 while allowing the retaining ring to rotate 40 times, and the eject plate 18 and the cylinder body 8 are connected by a chain 34. The product 15 may be ejected from the fixed mold 12 by retracting the eject plate 18 by stretching the chain 34 when the mold clamping cylinder 60 having the mold clamp 8 is retracted. In FIG. 6, reference numeral 35 denotes a spring, which constantly presses and urges the eject plate 18 forward, so that when the chain 34 is loosened and the mold OJ is clamped, the eject pin 19 is inserted into the cavity 14 of the mold. I'm guarding it so it doesn't get in. Furthermore, as shown in FIG.
It is also possible to hold the eject pin 40 degrees 40 and extend it 91. That is, the eject cylinder 36 was provided with the cylinder cover 251 of the mold clamping cylinder 6, and the pinuton rod F38 of the eject cylinder 36 was passed through Y1 inside the rond portion 6a of the movable bolt 26, and then the movable support member 271 was installed. Connected to the eject plate 39,
Eject plate 39θ due to advancement of pinuton rod 38]
Movable type J3 v-no product 15 with eject pin 40.40
It is also possible to output 4J+.

As described in detail above, according to the present invention, there is provided a fixed plate to which a fixed mold is fixed, and a retainer having an engaging protrusion that is rotatably provided on the fixed plate by a rotating means but not movable in the axial direction. A mold-clamping cylinder, which includes a mating ring, a movable mold that forms a molding cavity together with the fixed mold, is attached to a piston, and has an engaging protrusion at the fixed-mold side end of a cylinder tube that houses the piston, and a core mold-clamping cylinder. a mold opening/closing cylinder that moves in the axial direction so that the movable mold can freely contact the fixed mold, the retaining protrusion of the mold clamping cylinder is engaged with the retaining protrusion of the mold clamping cylinder. After the engaging ring is passed between the retaining protrusions by the mold opening/closing cylinder in a state where the phase with the retaining protrusions of the ring is shifted, the engaging ring is rotated by the rotating means, and the charging ring is rotated by the rotating means. The piston of the mold clamping cylinder was projected by matching the phase of the engaging protrusion with the engaging protrusion of the mold clamping cylinder, and the mold was clamped by engaging both the engaging protrusions. Therefore, the structure can be made simple and inexpensive.

Also, according to the invention, the IJ that opens and closes the mold and clamps the mold
Although the mold clamping cylinder is provided separately, even if the driving force of the mold clamping cylinder is small, the retaining protrusion of the retaining ring and the engagement protrusion of the mold clamping cylinder are engaged with υ, so that the mold clamping cylinder is not clamped. A large mold clamping force can be obtained by suppressing the pinuton, which is immovable and has a movable mold on both legs, on the side opposite to the fixed mold in the axial direction of the mold clamping cylinder. Since no force is required, the cylinder can be made smaller, the hydraulic flow rate can be reduced, the mold can be clamped and unclamped in a short time, and when the mold is opened, the cylinder and UV After completely releasing the pressure force acting between the front surface of the engagement projection 3"b and the front surface of each engagement projection 4, OJ rotates the retention ring.
It is possible to eliminate the frictional force between both surfaces of each of the ten engagement projections &゛1. Durability is broken, and production efficiency can be increased by 1.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of an injection molding machine equipped with a mold clamping device according to an OJ embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of Fig. 4 is an explanatory diagram showing the operation timing of the injection molding machine shown in FIG. 1, and 5(2) is a schematic diagram showing another embodiment. The perspective view 1 and FIG. 6 are a vertical cross-sectional view of FIG. 5, and FIG. 7 is a vertical cross-sectional view showing still another embodiment. 3... Fixed plate, 4... Engaging ring, 4a... Engaging protrusion, 6... Mold clamping cylinder, 8... Cylindrical body, 8a...
...Engagement protrusion, 9...Mold opening/closing cylinder, 12...Fixed type, ]3...Movable type, 14...Cavity, 15
···product. Patent applicant: Tokai-Yaka Denki Seisakusho Co., Ltd. Patent attorney Aoyama Hao and two others

Claims (1)

[Claims] (2) A fixed plate to which the fixed mold is fixed; A piaton containing a retaining ring having retaining protrusions at predetermined intervals in the circumferential direction, rotation means for rotating the engaging ring, and a movable mold that forms a molding cavity together with the fixed mold is housed. a mold clamping cylinder provided with retaining protrusions in the radial direction at a predetermined interval on the side end of the fixed mold of the cylinder tube; and the mold clamping cylinder is moved in the axial direction to fix the movable mold. A mold opening/closing unit 11 that can freely approach and separate from the mold is provided, and the engaging protrusion of the mold clamping cylinder is connected to the retaining protrusion of the pi-strand cylinder θ and the engaging protrusion of the engaging ring. The above engagement ring O) with the phase shifted.
Between the retaining protrusions, the i! After passing through the rl, the engaging ring is rotated by the rotating means,
The engagement protrusion of the engagement ring and the engagement protrusion of the mold clamping cylinder are aligned in phase, the pinuton of the mold clamping cylinder is protruded, and both engagement protrusions are engaged to clamp the mold. A mold clamping device for a mold.