KR100706500B1 - Clamping system for injection molding machine - Google Patents

Abstract

The present invention relates to a mold clamping apparatus of an injection molding machine capable of minimizing the amount of hydraulic oil required for mold clamping and boosting operation, and maximizing processing ease and space efficiency during manufacturing.

The mold clamping apparatus of the injection molding machine according to the present invention includes a first stationary plate and a second stationary plate, which are arranged in parallel at a predetermined distance, and a movable plate for reciprocating and moving a space between the first stationary plate and the second stationary plate. And a tie bar which integrally connects the movable die plate with the first and second fixed die plates and guides the movement of the movable die plate, wherein the movable die has a combination of a clamping ram, a piston ram, and a piston head. A ram structure is provided, one end of the mold ram is processed with male spline teeth, and the second stationary plate is provided with a rotating plate, and a central portion of the rotating plate is provided with a cross section of the shaped ram provided with the male spline teeth. A corresponding opening is provided so that the clamping ram can move through the opening of the rotating plate according to the movement of the movable die. The features.

Injection

Description

Clamping system for injection molding machine

1 is a front view of a toggle type clamping device according to the prior art.

Figure 2 is a front view of the composite mold clamping device according to the prior art.

3A and 3B are cross-sectional views showing an operating state of a spline gear type clamping device in FIG.

Figure 4 is a perspective view of the injection molding machine clamping apparatus according to the present invention.

5 is an exploded perspective view of an injection molding machine clamping device according to the present invention.

Figure 6 is a front view of the injection molding machine clamping apparatus according to the present invention.

Figures 7a to 7c is a reference diagram for explaining the operation of the injection molding machine mold clamping apparatus according to the present invention.

8A to 8C are cross-sectional views taken along lines A-A ', B-B', and C-C 'of FIGS. 7A to 7C, respectively.

Description of the main parts of the drawing

401: tie bar 402: template transfer cylinder

403: Clamp Ram 404: Piston Ram

405: piston head 406: male spline teeth

410: first fixed mold 411: first mold

420: second fixed plate 421: rotating plate

422 fine gear 423 pinion

424: drive motor 425: bearing

426: female spline tooth 430: moving plate

431 second mold 432 first port

433 Second port 434 Cylinder

435: first empty space 436: second empty space

The present invention relates to a clamping apparatus of an injection molding machine, and more particularly, to a clamping apparatus of an injection molding machine capable of minimizing the amount of hydraulic oil required for mold clamping and boosting operation, and maximizing processing ease and space efficiency during manufacturing. .

Injection molding machines are largely divided into injection apparatus and mold clamping apparatus. The main functions of the mold clamping device are to open and close the mold attached to the moving die, and to strongly fasten the mold so that the mold is not opened by the high pressure molten material injected into the mold.

In general, the clamping device of an injection molding machine is divided into a toggle type and a direct type, and the toggle type clamping device uses elasticity of the tie bar by the amount of elongation of a tie bar by using the kinematic principle of the toggle. This is a method of clamping the mold by generating a clamping force, that is, a force to fasten the mold, and the direct pressure clamping device is a method of clamping the mold by generating the clamping force by the hydraulic force according to the direct pressure of the mold clamping cylinder.

Looking at the toggle type mold clamping device according to the prior art in more detail with reference to the drawings. As shown in FIG. 1, in the toggle type mold clamping device according to the related art, the stationary mold plate 1 on which the stationary mold 2 is formed, and the movable mold 4 are formed at a position opposite to the stationary mold 2, are fixed at a distance It is composed of a movable plate 3 to be moved, a plurality of tie bars 5 for guiding the movable plate 3, and a support 6 to which one end of the tie bars 5 is fixed.

One end of the tie bar (5) is fixed to the stationary plate (1), the other end of the tie bar (5) is fixed to the support (6), a plurality of tie bars (5) along the circumference of the support (6) ) Is fastened. Therefore, the movable die 3 is installed to reciprocate a predetermined distance between the support 6 and the stationary die 1. The movable mold 4 is installed to be capable of linear reciprocation along the tie bar 5 by the toggle mechanism 7.

In addition, the toggle mechanism 7 is provided between the toggle cylinder 8, which is supported to be able to swing while moving straight in the vertical direction, between the movable die 3 and the support 6, and the toggle cylinder 8 It consists of a toggle arm (9) which is swingably supported by the operation of, and is connected between the toggle cylinder (8) and the toggle arm (9), respectively.

The toggle mechanism 7 is oscillated by a driving unit (not shown), and when the driving unit is driven, the movable plate 3 moves to the tie bar (3) as the toggle cylinder 8 of the toggle mechanism 7 moves downward. 5) Advance on the mold, the mold closing proceeds at the same time, the clamping force is generated and the molding of the mold apparatus proceeds.

In this way, the hydraulic fluid of the toggle cylinder is at least about 20 to 25 times higher than the direct pressure by using the basic principle of the toggle, so the capacity of the hydraulic oil can be reduced, and thus the cycle time of the mold opening and closing operation. This fast and low energy consumption has the advantage, but when the mold replacement requires a separate mold thickness adjusting device to adjust the mold thickness according to the mold thickness, there is a disadvantage that takes a considerable time when setting the exact clamp force.

On the other hand, in the case of the direct pressure clamping device, since the clamping force is generated only by the force of the opening and closing cylinder, the size of the opening and closing cylinder is larger than that of the toggle type clamping device. There are disadvantages. In addition, since the opening and closing cylinder and the booster ram is installed in a linear direction, the mechanism is large and complicated disadvantages.

In order to overcome the shortcomings of the toggle type and direct pressure type clamping devices described above, a compound type clamping device has been proposed. Looking at the composite mold clamping device in more detail as follows. As shown in FIG. 2, the composite mold clamping device according to the related art includes a stationary mold plate 11 having a stationary mold 12 on one side of the base 17, and the stationary plate 11 includes a plurality of upper and lower plates. A tie bar 15 is provided.

On the opposite side of the stationary plate 11, a movable plate 13 having a movable mold 14 facing the stationary mold 12 is provided to be capable of reciprocating. A support cylinder 20 is formed in the support 16, and a mold ram 30 that is slide-transferd for a predetermined distance is embedded in the mold cylinder 20. The mold ram 32 is connected to the movable plate 13 by a shaft 34, and a first spline gear 42 is formed in the mold ram 30, and the inside of the mold cylinder 30 is formed. The second spline gear 44 is inherent therein.

As shown in FIGS. 3A and 3B, after the first spline gear 42 and the second spline gear 44 are alternately overlapped with each other, the clamping ram 30 is driven inside the mold cylinder 20 by an external force. The movable die 13 is moved in the direction of the stationary die 11. At this time, the first spline gear 42 is rotated by a predetermined angle in a state in which the movable mold 14 of the movable plate 13 is close to the fixed mold 12 of the stationary plate 11, and the second spline gear 44 is rotated at an angle. ) Is inserted. As the teeth of the first spline gear 42 are advanced by the teeth of the second spline gear 44, the movable mold 14 and the fixed mold 12 are sealed.

As described above, the composite clamping device includes a mold ram 30 provided in the mold ram 20 provided in the mold cylinder 20 and first and second spline gears 42 and 44 therein, respectively. When the movable die 13 is being transferred, the movable die 13 is guided, and when the movable die 14 and the stationary die 12 are sealed and the pressure is required, the shaft 34 fixed to the movable die 13 is removed. One spline gear 42 is rotated to cross the second spline gear 44 inside the mold ram 30, and then hydraulic oil is supplied to the mold cylinder 20 to boost the pressure.

However, the composite mold clamping device according to the prior art has a large area where the spline-shaped teeth or the bolt- or ring-shaped teeth machined in the circumferential direction can not be engaged with the teeth of the clamping ram, so that a large clamping force must be applied. There may be a problem in strength is difficult to apply to large injection molding machine. In addition, the internal processing and the spline-shaped teeth of the mold ram has to be processed with high precision, there is a problem that the manufacturing cost is increased.

The present invention has been made to solve the above problems, to provide a mold clamping device of an injection molding machine that can minimize the amount of the hydraulic oil required for the mold clamping and boosting operation, and maximize the ease of processing and space efficiency during manufacturing. There is a purpose.

The mold clamping apparatus of the injection molding machine according to the present invention for achieving the above object is a space between the first fixed plate, the second fixed plate and the first fixed plate and the second fixed plate which are arranged in parallel at a predetermined distance apart. It comprises a reciprocating, moving movable plate and a tie bar which integrally connects the movable plate and the first and second fixed plate and guides the movement of the movable plate.

The movable mold is provided with a clamping ram structure composed of a combination of a clamping ram, a piston ram, and a piston head, one end of the clamping ram is processed with a male spline tooth, and the second fixed mold is provided with a rotating plate. The central portion of the rotating plate is provided with an opening corresponding to the cross-sectional shape of the clamping ram provided with the male spline teeth, the inner surface of the rotating plate is provided with female spline teeth of the shape corresponding to the male spline teeth of the clamping ram,

According to the movement of the movable die plate, the clamping ram can pass through the opening of the rotating plate, and the male spline teeth of the clamping ram and the female spline teeth of the rotating plate can be fastened.

Preferably, the piston ram is composed of at least one or more to support one end of the mold clamping ram and one end of each piston ram is provided with a piston head, the movable die has a number corresponding to the number of the piston ram A mold cylinder is provided so that each of the piston rams and a piston head is inserted into the respective mold cylinders.

Preferably, the cylinder is provided with a first empty space and a second empty space on each of the left and right sides of the piston head, and the moving mold supplies hydraulic oil to the first empty space and the second empty space, respectively. A first port and a second port are provided.

Preferably, the apparatus further includes a template transfer cylinder provided between the movable die and the first stationary die to selectively move the movable die back and forth.

Preferably, a fine gear is provided around the rotating plate, and one side of the rotating plate further includes a pinion and a driving motor for transmitting a driving force to the fine gear of the rotating plate.

Preferably, the bearing or sliding surface is further provided to minimize the friction between the joint surface of the rotating plate and the second fixed plate.

According to a feature of the present invention, the mold closing process is divided into a first mold closing process and a second mold closing process, and a plurality of mold cylinders are evenly provided on the front surface of the moving mold during the process of the second mold closing process, in which the mold is a fine distance moving process. By moving the movable plate to be able to apply a uniform clamping force over the entire surface of the mold when the mold is fastened. In addition, in the mold opening state, as a part of the mold clamping structure is protruded out of the mold clamping apparatus, the overall geometric size of the mold clamping apparatus can be reduced.

Hereinafter, a mold clamping apparatus of an injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings. 4 is a perspective view of an injection molding machine clamping apparatus according to the present invention, FIG. 5 is an exploded perspective view of an injection molding machine clamping apparatus according to the present invention, and FIG. 6 is a front view of the injection molding machine clamping apparatus according to the present invention.

As shown in FIGS. 4 to 6, the mold clamping apparatus 400 of the injection molding machine according to the present invention first includes a first fixed mold 410, a movable mold 430, and a second fixed mold 420. The first fixed plate 410, the movable plate 430, and the second fixed plate 420 are sequentially arranged and integrally connected by a predetermined tie bar 401. The first mold 411 and the second mold 431 are provided on the surfaces of the first fixed mold 410 and the movable mold 430 facing each other. For example, the first stationary plate 410 is provided with a first mold 411 having a yaw shape, and the movable plate 430 facing the second die 431 has an iron shape. It may be provided.

The movable die 430 moves between the first fixed die 410 and the second fixed die 420 along the tie bar 401, and thus, the second die 431 of the movable die 430. ) And whether the mold is clamped between the first mold 411 of the first fixing plate 410. Here, the movement of the movable die plate 430 is enabled by the template transfer cylinder 402 provided between the movable die plate 430 and the first fixed die plate 410.

On the other hand, exactly one side of the movable mold 430, the movable mold 430 on the opposite side of the surface provided with the second mold 431 is provided with a clamping ram structure. The clamping ram structure is composed of a combination of the clamping ram 403, the piston ram 404 and the piston head 405. The mold ram 403 has a cylindrical shape, and male spline teeth 406 are processed at one end of the mold ram 403. The male spline teeth 406 are arranged at regular intervals along the circumference of the clamping ram 403. The male spline teeth 406 are fastened to the rotating plate 421 of the second fixed plate 420 to be described later. The other end of the clamping ram 403 is provided with a piston ram 404 for supporting the clamping ram 403, the piston ram 404 may be configured in plurality. One side of each of the piston ram 404 is provided with a piston head 405. Here, the piston ram 404 is fixed and supported by the movable plate 430, and thus the clamping ram structure consisting of the clamping ram 403, the piston ram 404, the piston head 405 is the movable type The plate 430 and the integrated structure.

On the other hand, the movable plate 430 is provided with a number of cylinder cylinders 434 corresponding to the plurality of piston ram 404, each of the piston ram 404 and the piston head 405 is a respective cylinder cylinder 434 It is inserted in). The shape cylinder 434 has a shape corresponding to the piston ram 404 and the piston head 405, for example, may be implemented in a cylindrical shape. Here, the piston head 405 provided on one side of the piston ram 404 has a structure that is not in close contact with the bottom surface of the mold cylinder 434, the piston head 405 in the mold cylinder 434 The first empty space 435 and the second empty space 436 are provided at left and right sides, respectively. The first empty space 435 and the second empty space 436 are spaces in which the hydraulic oil supplied through the first port 432 and the second port 433 is finally located. As the hydraulic oil having a predetermined hydraulic pressure is supplied to the first and second empty spaces 435 and 436, the front and rear fine movement of the movable mold plate 430 is possible. Specifically, when the hydraulic oil is supplied to the first empty space 435 through the first port 432, the movable die plate 430 is moved forward and fine to move the first mold 411 and the second mold 431. When the hydraulic fluid is supplied through the second port 433 to the second empty space 436, the first mold 411 and the second mold 431 are released from each other.

As described above, the second fixed plate 420 is basically connected to the first fixed plate 410 and the tie bar 401, so that the first fixed plate 410 and the second fixed plate of the movable plate 430 are fixed. It serves to guide the movement between the plates 420 stably.

A central portion of the second fixed mold 420 is opened to allow the mold clamp 403 to penetrate. That is, the cross-sectional shape of the central opening 427 of the second fixed plate 403 corresponds to the cross-sectional shape of the mold clamp provided with male spline teeth. On the other hand, one side of the second fixed plate 420 is provided with a rotating plate 421, the central portion of the rotating plate 421 has the same shape as the central opening 427 of the second fixed plate 420. . The inner surface of the rotating plate 421 is provided in the female spline teeth 426 (see Fig. 8a) of the shape corresponding to the male spline teeth 406 of the mold clamp 403. In addition, a fine gear 422 (see FIG. 8A) is provided around the rotating plate 421, and a pinion for transmitting a driving force to the fine gear 422 of the rotating plate 421 is provided at one side of the rotating plate 421. 423 and a drive motor 424 are provided. In addition, a bearing 425 may be provided between the rotating plate 421 and the second fixing plate 420 to reduce friction between the rotating plate 421 and the second fixing plate 420.

On the other hand, the movable plate 430 is provided with a first port 432 and a second port 433 for supplying the hydraulic oil, the first and second ports 432, 433 are the cylinder cylinder 434, respectively Are connected to the first empty space 435 and the second empty space 436.

Referring to the operation of the injection molding machine mold clamping apparatus according to the present invention having such a configuration as follows. 7A to 7C are reference diagrams for explaining the operation of the injection molding machine clamping apparatus according to the present invention, and FIGS. 8A to 8C are cross-sectional views taken along the lines AA ′, BB ′, and CC ′ of FIGS. 7A to 7C, respectively. .

The operation of the mold clamping device 400 according to the present invention is largely divided into a mold opening state in which a mold is released and a mold closing state in which a mold is fastened. First, the state of mold opening is as follows. The mold opening state is a state in which the mold is released as described above, and the first mold 411 of the first fixed mold 410 and the second mold 431 of the movable mold 430 are separated from each other. At this time, the movable plate 430 is located close to the second fixed plate 420, as shown in Figure 7a and a portion of the mold ram 403 provided in the movable plate 430 is the second fixed type It penetrates through the central opening 427 of the plate 420 and protrudes out of the mold clamping device 400.

In the mold opening state, the mold closing process is performed. The mold closing process can be classified into a first mold closing process and a second mold closing process in detail. Here, the first mold closing process is relatively faster than the second mold closing process.

First, the first mold closing process is performed by the plate transfer cylinder 402 provided between the movable plate 430 and the first stationary plate 410 in the open state. Refers to a process of moving to the first fixed plate 410 at high speed. Through the first mold closing process, the second mold 431 of the movable mold 430 and the first mold 411 of the first fixed mold 410 are close to each other as shown in FIG. 7B but are not in contact with each other. State is achieved. That is, in order to prevent mold damage due to rapid mold fastening, when the first mold closing process is completed, the second mold 431 of the movable mold 430 and the first mold 411 of the first fixed mold 410 may be They are spaced apart while maintaining the fine distance d. At this time, the fine distance d between the second mold 431 of the movable mold 430 and the first mold 411 of the first fixed mold 410 may be sufficiently changed according to a user setting. Meanwhile, due to the progress of the first mold closing process, the mold ram 403 provided in the movable mold 430 is also moved toward the first fixed mold 410 together with the movable mold 430 so that the male spline teeth A portion of the clamping ram 403 provided with 406 is positioned at an open portion of the rotating plate 421.

In the state where the first mold closing process is in progress, the second mold closing process is performed. First, the driving motor 424 provided on one side of the rotating plate 421 is operated. Accordingly, the pinion 423 and the fine gear 422 of the rotating plate 421 are engaged to operate so that the rotating plate 421 rotates.

On the other hand, as described above, the inner surface of the rotating plate 421 is provided with a groove portion of the shape corresponding to the spline teeth 406 of the clamping ram 403, that is, the female spline teeth 426, the rotating plate 421 The male spline teeth 406 of the clamping ram 403 are seated on the female spline teeth 426 of the rotating plate 421 when the predetermined angle rotates, and thus, the clamping ram 403 and the rotating plate 421 are rotated. Is a fastening structure. That is, the clamping ram 403 is fixed to the second fixed plate 420. The fastening process between the male spline teeth 406 of the clamping ram 403 and the female spline teeth 426 of the rotating plate 421 is as shown in FIGS. 8A to 8C.

In this way, the first port 432 provided on one side of the movable plate 430 in a state where the male spline teeth 406 of the clamping ram 403 and the female spline teeth 426 of the rotating plate 421 are fastened to each other. The low pressure hydraulic oil is supplied to the first empty space 435 of the mold cylinder 434 through it. When the hydraulic oil is supplied to the first empty space 435, the movable die plate 430 is moved forward and finely by hydraulic pressure of the hydraulic oil, thereby being completely fastened to the first mold 411 and the second mold 431. At this time, the distance that the movable die plate 430 is moved corresponds to the distance (d) spaced apart from the first mold 411 and the second mold 431 at the completion of the first mold closing process. In addition, as described above, as the male spline teeth 406 of the clamping ram 403 are fastened to the female spline teeth 426 of the rotating plate 421, the driving force by the mold cylinder 434 is movable. It is transmitted to the plate 430 stably. Here, the movement of the fine distance of the movable die 430 is performed by the plurality of mold cylinders 434 evenly provided over the entire movable die 430, so that the first die 411 and the second die ( During the fastening process of 431, a constant clamp force is transmitted over the entire surface of the mold.

As shown in FIG. 7C, the movable die 430 and the first stationary die 410 of the movable die 430 are moved by a predetermined distance movement of the movable die 430 through the plurality of die cylinders 434. The first mold 411 is completely fastened. In this state, when the high pressure hydraulic oil is supplied to the first port 432 to prevent the mold from being pushed during the injection process, the second mold closing process and the series of mold closing processes are completed.

On the other hand, the mold opening process is a series of mold closing process consisting of the first and second mold closing process in reverse order.

The clamping apparatus of the injection molding machine according to the present invention has the following effects.

The mold closing process is divided into a first mold closing process and a second mold closing process, and the moving mold is moved by using a plurality of mold cylinders evenly provided on the front surface of the movable mold during the process of the second mold closing process, in which the mold is a fine distance moving process. It prevents the damage of the mold during mold closing, and it is possible to apply a uniform clamping force over the entire surface of the mold to improve the working reliability.

In addition, in the mold opening state, a part of the clamping ram is protruded out of the clamping device, thereby reducing the overall geometric size of the clamping device. In addition, in the conventional case, the mold cylinder is implemented as one large cylinder, but in the case of the present invention, by replacing the plurality of relatively small mold cylinders having a short stroke, it is easy to manufacture and lower the manufacturing cost by processing on the back of the moving mold. It is possible to maximize the efficiency of the plant by minimizing the amount of hydraulic oil required for mold clamping and boosting operation.

Claims (6)

A first stationary plate and a second stationary plate disposed to be parallel to each other at a predetermined distance; A movable plate configured to reciprocate and move a space between the first fixed plate and the second fixed plate; A tie bar which integrally connects the movable die plate with the first and second fixed die plates and guides the movement of the movable die plate; And A template transfer cylinder provided between the movable plate and the first fixed plate to selectively move the movable plate back and forth; It is made, including The moving plate is provided with a clamping ram structure composed of a combination of a clamping ram, a piston ram, and a piston head, one end of the clamping ram is processed with a male spline tooth, The second stationary plate is provided with a rotating plate, the central portion of the rotating plate is provided with an opening corresponding to the cross-sectional shape of the mold ram with the male spline teeth, The inner surface of the rotating plate is provided with a female spline teeth of the shape corresponding to the male spline teeth of the mold ram, According to the movement of the movable die plate, the clamping ram can pass through the opening of the rotating plate, the male spline teeth of the clamping ram and the female spline teeth of the rotating plate can be fastened, The piston ram is composed of at least one to support one end of the clamping ram, and one end of each of the piston ram is provided with a piston head, the movable die is provided with as many cylinders corresponding to the number of the piston ram And the respective piston rams and piston heads are inserted into the respective mold cylinders. delete According to claim 1, The cylinder is provided with a first empty space, a second empty space on each of the left and right relative to the piston head, The moving mold has a clamping device of an injection molding machine, characterized in that the first port and the second port for supplying the hydraulic fluid to the first empty space and the second empty space, respectively. delete The molding apparatus of claim 1, wherein a fine gear is provided around the rotating plate, and one side of the rotating plate further includes a pinion and a driving motor for transmitting a driving force to the fine gear of the rotating plate. delete

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