KR100592854B1 - clamping apparatus for injection molding machine - Google Patents

Abstract

The present invention is high energy efficiency by operating at low flow rate, high productivity while reducing manufacturing cost and maintenance cost, precision molding by minimizing deformation of mold during clamping force while improving volume utilization by reducing volume by eliminating column part The present invention relates to a molding apparatus of an injection molding machine for increasing the productivity, shortening the time for linearly reciprocating the moving die and increasing productivity.

The mold clamping apparatus of the injection molding machine according to the present invention is connected to each of a plurality of mold cylinders installed in the movable mold, and a clamping ram selectively reciprocated and inserted into the support plate to be rotated at an angle by the operation of the rotating member. A rotating plate for supporting the clamping force, a first through hole formed in the support plate to selectively insert and guide and support the clamping ram during the reciprocating movement of the clamping ram, and inserted into the rotating plate so as to coincide with the first through hole. It is characterized by consisting of a second through hole supporting.

   Injection molding machine, clamping ram, fixed plate, moving plate, through hole, bushing

Description

   Clamping apparatus for injection molding machine

1 is a schematic diagram showing a conventional toggle type clamping device.

Figure 2 is an internal view showing the interior according to an embodiment of a conventional hybrid mold clamping device.

Figure 3a and Figure 3b is a cross-sectional view showing the operating state of the spline gear type clamping apparatus in FIG.

4 to 7 is a state diagram showing the mold opening and closing of the mold clamping apparatus according to the present invention.

8 is a cross-sectional view taken along the line A-A of FIG.

9 is a cross-sectional view taken along the line B-B in FIG. 8;

* Description of the symbols for the main parts of the drawings *

51: fixed plate 53: movable plate

55: tie bar 56: support plate

58: high speed cylinder 66: bearing

67: rotating shaft 70: rotating member

72: electric motor 74,76: first and second gear

80: rotating plate 100,200: first and second hole

300: bushing

The present invention relates to a clamping apparatus of an injection molding machine, and more particularly, it is energy efficient by operating quickly at a low flow rate, increasing productivity while reducing manufacturing cost and maintenance cost, and improving space utilization by reducing volume by eliminating column parts. The present invention relates to a molding apparatus of an injection molding machine for increasing productivity by minimizing the deformation amount of the template when the clamping force is applied and shortening the time for linear reciprocating movement of the movable mold.

In general, an injection molding machine is largely divided into an injection device and a clamping device.

The main functions of the mold clamping device are to open and close the mold attached to the moving mold and to fasten the mold so as not to open by the high pressure molten material injected into the mold.

The mold clamping device of an injection molding machine is usually made of a toggle type and a direct type according to the method.

  The toggle type clamping device is to generate the clamping force (force to clamp the mold) by the elastic recovery force by the amount of elongation of the tie bar by using the kinematic principle of the toggle, the direct pressure type is to direct the pressure of the mold clamping cylinder The mold is generated by the hydraulic force according to the clamping force.

As shown in FIG. 1, the toggle type mold clamping apparatus includes a stationary plate 1 having a stationary mold 2 and a movable mold 4 at a position opposite to the stationary mold 2. Is formed and consists of a plurality of tie bars (5) for guiding the movable plate (3) and the movable plate (3) to be moved a predetermined distance.

At this time, one end of the tie bar (5) is fixed to the stationary plate (1), the other end is fixed to the support (6).

That is, 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.

Further, the toggle mechanism 7 is provided between the toggle cylinder 8, which is supported to be able to swing while moving straight in the up and down direction (as seen from the drawing), the movable die 3, and the support 6. It is provided with a toggle arm (9) to be swingably supported by the operation of the toggle cylinder (8), the link between the toggle cylinder (8) and the toggle arm (9) are each linked (link).

The toggle mechanism 7 is rocked by a drive unit (not shown).

When the drive unit is driven, the toggle mechanism 7 is operated so that the movable die 3 moves forward (moves in the right direction in the drawing) to perform mold closing, and at the same time clamping force. ) Is generated, and the mold apparatus is shaped by this clamping force.

In this way, by using the basic principle of the toggle, the hydraulic oil of the toggle cylinder is at least about 20 to 25 times higher than the direct pressure according to the expansion ratio of the toggle force, so the capacity of the hydraulic oil can be reduced, and thus the cycle time of the mold opening and closing operation is Although it has the advantage of fast and low energy consumption, it requires a separate mold thickness adjusting device that needs to adjust the mold thickness according to the mold thickness when replacing the mold, and it takes a long time to set the correct 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, and accordingly, a lot of hydraulic oil is required, and energy consumption for maintaining the power is also increased. There are disadvantages.

In addition, since the opening and closing cylinder and the booster ram are installed in a straight direction, the mechanism is large and complicated.

Thus, a composite clamping device has been used.

As shown in FIG. 2, in the composite mold clamping device, a stationary mold plate 11 having a stationary mold 12 is installed on one side of the base 17 side, and the stationary plate 11 includes a plurality of tie bars (up and down). 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.

On the other hand, the clamping cylinder 20 is fixed to the support 16, and the clamping ram 30 which is slide-transmitted for a fixed distance is inherent in the clamping cylinder 20.

In addition, the inside of the mold clamp 30 is an empty space 32.

The clamping ram 30 is connected to the movable die 13 by a shaft 34.

On the other hand, a first spline gear 44 is formed inside the mold ram 30, and a second spline gear 42 is fastened to an end portion of the shaft 34 opposite to the movable mold plate.

As shown in FIGS. 3A to 3B, when the first spline gear 44 and the second spline gear 42 are alternately positioned with each other, the shaft 34 is clamped by an external high speed moving cylinder (not shown). It slides in the interior of the 30 and the movable die 13 is moved in the direction of the stationary die (11).

At this time, when the movable mold 14 of the movable plate 13 and the fixed mold 12 of the stationary plate 11 are almost closed, the second spline gear 42 fixed to the shaft 34 rotates by a predetermined angle. And is inserted into the first spline gear 44.

Then, when the teeth of the second spline gear 42 and the teeth of the first spline gear 44 are engaged, the movable mold 14 is fixed by the hydraulic force generated in the mold cylinder 20. The mold 12 is sealed.

As described above, the composite clamping device includes the clamping ram 30 provided in the clamping cylinder 20 and the first and second spline gears 44 and 42 therein, respectively, when the movable die 13 is being transferred. When the movable mold 14 and the fixed mold 12 are sealed and the pressure is required, the shaft 34 fixed to the movable mold 13 rotates the second spline gear 42. After engaging the first spline gear 44 in the mold clamp 30, the hydraulic oil is supplied to the mold cylinder 20 to boost the pressure.

At this time, the complex clamping device as described above solves many problems of the toggle type and the direct pressure clamping device.

In other words, the energy consumption is reduced by reducing the flow rate required for boosting and moving the die, thereby reducing the size of the hydraulic system and fast opening and closing speed.

However, in the conventional mold clamping device, the area where the spline-shaped teeth or circumferential bolts or ring-shaped teeth can be engaged with the teeth of the clamping ram is not large enough to receive a large clamping force. There was a problem that it may be difficult to apply to large injection molding machine because the strength problem may occur when the pressure is increased.

In addition, the internal processing and spline shape of the mold ram have to be precisely and highly processed, so there is a high manufacturing cost.

The present invention has been made to solve the above problems, it operates quickly at a small flow rate to increase energy efficiency, improve the productivity by reducing the manufacturing cost and maintenance costs, the mold acts by acting the clamping force in the center of the moving plate It is an object of the present invention to provide a molding apparatus of an injection molding machine that is more space-efficient than a conventional molding apparatus by protecting the mold while minimizing the deformation of the template when protecting the mold and protecting the volume.

In order to solve the above problems, the molding apparatus of the injection molding machine according to the present invention is connected to each of a plurality of mold cylinders installed in the moving mold, and a clamping ram selectively reciprocated, and inserted into the support plate, It is rotated by an angle by the operation, the rotating plate for supporting the clamping force during mold closing, the first through hole formed in the support plate to selectively insert, guide and support each of the clamping ram during the reciprocating movement, and the rotating plate to match the first through It is formed in the mold characterized in that it is made of a second through hole to support the insertion of the mold clamping ram.

Hereinafter, with reference to the accompanying drawings, the configuration of the present invention will be described in more detail.

4 to 7 are state views showing the mold opening and closing of the mold clamping apparatus according to the present invention, FIG. 8 is a cross-sectional view taken along the line A-A of FIG. 4, and FIG. 9 is a cross-sectional view taken along the line B-B of FIG.

As shown in Figures 4 to 9, the mold clamping apparatus of the injection molding machine according to the present invention is disposed on one side and the fixed mold plate 51 is attached to the fixed mold 52, the support plate 56 disposed on the other side and Tie bar 55 connected between the fixed plate 51 and the support plate 56 and a high-speed moving cylinder 58 between the fixed plate 51 and the support plate 56 so as to be moved forward and backward. In the mold clamping device of the injection molding machine, which is installed and consists of a movable mold 53 with a movable mold 54 attached thereto, it is connected to each of the plurality of mold cylinders 60 installed in the movable mold 53 to selectively set a predetermined distance. The rotating plate 80 is inserted into the support plate 56 and the support plate 56 is reciprocated and rotated by an operation of the rotating member 70 to support the clamping force formed in the mold cylinder 60 during mold closing. And, the reciprocating by the high-speed moving cylinder 58 of the mold ram 64 and the movable plate 53 The first through hole 100 formed in the support plate 56 and the rotating plate 80 to be coincident with the first through hole 100 to selectively insert and guide and support the respective inserts during movement are formed. It is characterized by consisting of a second through hole 200 to support the insertion.

4 to 7 is a state diagram showing a state of operation as an embodiment of the mold clamping apparatus according to the present invention.

As shown, the mold clamping device according to the present invention connects and installs a plurality of tie bars 55 between the stationary plate 51 having the stationary mold 52 and the support plate 56, and the stationary plate 51. The movable die 53 having the movable mold 54 between the support plates 56 is provided so as to be movable forward and backward.

At this time, the movable plate 53 is connected to the stationary plate 51 through the high-speed moving cylinder 58, the plurality of small mold cylinder 60 and the mold ram 64 is provided on the back.

The mold cylinder 60 forms the first and second ports 53a and 53b on the movable die 53 for operating by supply of hydraulic oil.

That is, the mold cylinder 60 receives hydraulic oil from the first port 53a to push the movable mold 53 toward the stationary plate 51 to close the mold when the mold is closed, and the second port 53b. The hydraulic die (53) and the fixed mold (51) are released from the fastening state when the hydraulic fluid is supplied from the mold.

In addition, the movable die 53 is installed to be quickly opened or opened by the high-speed moving cylinder 58.

In addition, the mold ram 64 is firmly embedded in the movable die 53.

At this time, the mold cylinder 60 and the mold ram 64 is for boosting the movable mold 54 to be firmly fastened to the fixed mold 52, and it is preferable to use two or more small hydraulic cylinders.

In addition, since the clamping cylinder 60 and the clamping ram 64 are only for the forward, backward and the boost of the short section, the clamping cylinder 60 and the clamping ram 64 are configured to have a short stroke distance.

In addition, the rotation plate 80 is rotatably inserted into the support plate 56.

The rotating plate 80 is inserted into the side of the support plate 56 facing the movable plate 53 is rotatably installed by the rotating member (70).

The rotating member 70 rotates the clamping ram 64 at a predetermined angle and rotates so as to correspond to the distal end of the rotating plate 80 or to be shifted at a predetermined angle, and the electric motor 72 fixed to the support plate 56. The first gear 74 is rotated by being connected to the electric motor 72, and the second gear 76 is formed on the outer circumference of the rotating plate 80 to be engaged with the first gear 74.

The second gear 76 is formed on a portion of the outer circumference of the rotary plate 80 to limit the rotation angle of the rotary plate 80.

At this time, a bearing 66 or a sliding surface is formed between the supporting plate 56 and the rotating plate 80 to minimize the friction of the rotating rotating plate 80.

In particular, the rotating plate 80 is connected to the rotating shaft 67 is rotatably inserted into the support plate 56.

On the other hand, the support plate 56 is formed with a plurality of first through holes (100).

The first through hole 100 is made of the same number as the clamp ram (64).

In addition, the rotating plate 80 is formed with a second through-hole 200 corresponding to the first through-hole (100).

8 and 9, the first through holes 100 and the second through holes 200 form circular trajectories of the same diameter.

When the rotating plate 80 rotates on the support plate 56, the first through holes 100 and the second through holes 200 coincide with each other or are alternately positioned.

In addition, the mold ram 64 is inserted and guided in a state where the first through hole 100 and the second through hole 200 coincide with each other.

Meanwhile, the bushing 300 is inserted into the second through hole 200 of the rotating plate 80 to reduce the friction between the second through hole 200 and the clamping ram 64 and simultaneously support the clamping ram 64. .

Referring to the operation example of the present invention by the above configuration is as follows.

At the time of mold opening, as shown in FIG. 4 and FIG. 8, the mold clamp 64 of the rear part of the movable die 53 is penetrated through the support plate 56 and the rotating plate 80.

At this time, the movable die 53 is quickly opened from the stationary die 51 through the high-speed moving cylinder 58 to open the mold.

Subsequently, for mold closing, as shown in FIGS. 5 to 7 and 9, the movable mold 53, the movable mold 54, and the four mold clamps 64 are fixed to the fixed mold 51. It is conveyed at high speed by the operation of the fast-moving cylinder 58.

At this time, the movable mold 54 is moved in the direction of the fixed mold 52 so as to leave a slight distance between the fixed mold 52 and the movable mold 54 to protect the mold.

In addition, the mold ram 64 formed in the movable mold 52 is separated from the first and second through holes 100 and 200, and the rotating plate 80 is rotated, and the second through hole 200 alternates with the mold ram 64. To be located.

Thus, the clamping ram 64 of the rotating plate 80 and the movable die 53 are brought into contact with each other.

That is, the rotary plate 80 inserted into the front portion of the support plate 56 forms a second gear 76 on the outer circumference and rotates due to the electric motor 72 provided on the support plate 56. 74) and rotate 45 °.

Then, the low pressure oil is put into the first port 53a of the mold cylinder 60 connected to the mold ram 64 to make contact with the rotating plate 80 and the mold ram 64, and at the same time, the movable mold 53 is pushed and fixed. The mold 52 and the movable mold 54 are closed, and the high pressure oil is supplied to boost the pressure.

Subsequently, when injection and cooling of the product are completed, oil is poured into the second port 53b to open the mold.

Afterwards, the mold opening process of retracting the moving template at high speed for product extraction takes the opposite steps to the mold closing process described above.

  As described above, the mold clamping device according to the present invention uses a very small amount of pressurized oil to perform a fastening and boosting operation so that the energy efficiency is high and the transfer for mold opening and closing is fast.

In addition, the production cost is reduced by replacing two or more small cylinders requiring a large force, and are easy to apply to a large injection molding machine.

In addition, because the device is easy to process, it can be manufactured, installed and maintained at a lower cost than the existing system, and since the clamping force acts on the surface of the movable plate, it can be transmitted evenly parallel to the mold, thereby increasing the reliability of the operation.

In addition, since the clamping ram 64 of the rear portion of the movable mold 53 which transmits the clamping force is inserted through the support plate 56 and the rotating plate 80 at the time of mold opening, the distance between the fixed mold plate 51 and the support plate 56 is increased. The shorter overall assembly length reduces the space taken by the clamping device.

According to the mold clamping apparatus of the injection molding machine according to the present invention as described above, the mold clamping and boosting operation using a very small amount of pressurized oil to increase the energy efficiency, the mold opening and closing by separating the feed and boosting for mold clamping To increase the feed rate.

In addition, by replacing the mold cylinder requiring a large force with four or a plurality of small cylinders, it is easy to manufacture and process, which is easy to apply to a large injection molding machine.

In addition, the device is easy to manufacture, install and maintain at a lower cost than conventional systems, and the clamping force can be transmitted evenly to be parallel to the mold, which is advantageous for the mold protection and the reliability of operation is also high.

In addition, since the clamping ram on the rear side of the movable mold transmitting the clamping force passes through the support plate and the rotating plate when opened, the distance between the support plate and the stationary plate is shortened, thereby reducing the space occupied by the mold clamping device.

Claims (4)

It is possible to move forward and backward by a high-speed moving cylinder between the fixed mold plate and the support plate, the fixed plate attached to the fixed mold, the support plate disposed on the other side, the tie bar installed between the fixed plate and the support plate, and the fixed plate and the support plate In the molding apparatus of the injection molding machine consisting of a movable mold with a movable mold installed, A clamping ram which is selectively reciprocated in connection with each of the plurality of clamping cylinders installed in the movable mold; A rotating plate inserted into the support plate to be rotated at an angle by the operation of the rotating member to support the clamping force during mold closing; A first through hole formed in the support plate for selectively inserting and guiding and supporting each of the clamping rams; The molding apparatus of the injection molding machine, characterized in that it comprises a second through hole formed in the rotating plate so as to coincide with the first through hole to insert and support the clamping ram at the start of mold. The method of claim 1, The rotating member is an electric motor fixed to the support plate; A first gear connected to the electric motor and rotating; And a second tooth formed on an outer circumference of the rotating plate to engage with the first tooth. The method of claim 1, Molding apparatus of the injection molding machine, characterized in that the support plate and the rotating plate to form a bearing or sliding surface therebetween. The method of claim 1, The second through hole of the rotating plate reduces the friction of the clamping ram through a bushing therein, and guides the clamping ram.

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