KR20090078474A - Clamping apparatus of injection molding machine - Google Patents

Abstract

A mold clamping unit of an injection molding machine is provided to increase transfer speed for opening and closing of a mold, and to reduce an establishment area of the machine by reducing size of a shaping cylinder and a pressurized oil storage tank. A mold clamping unit of an injection molding machine includes a first fixing plate(20), a second fixing plate(30), a moving plate(50), a column member(60), a ball screw shaft(80), and a hydraulic chamber(31,32). A fixing mold part(21) is installed at the first fixing plate. The second fixing plate is separated from the first fixing plate with constant distance. The column member is connected to one side of the moving plate, and penetrates the inside of the second fixing plate. The ball screw is rotated in an accommodating groove(61) formed on an inner side of the column member. The hydraulic chamber is fixed on the second fixing plate.

Description

Clamping Apparatus of Injection Molding Machine

The present invention relates to a clamping apparatus of an injection molding machine, and more particularly, it is possible to save energy by using less pressurized oil, and thus to reduce the size of the pressurized oil storage tank and the mold cylinder, thereby reducing the installation area of the apparatus. It is possible to separate the transfer operation and the boosting operation so that the transfer speed for the mold opening and closing is faster, the clamping force is transmitted evenly, which is advantageous for the protection of the mold, and thus the reliability of the operation is increased. It is easy to increase the reliability of the device.

In general, an injection molding machine is mainly composed of an injection apparatus and a mold clamping apparatus, and the mold clamping apparatus basically controls the opening and closing operations of the mold, that is, the mold opening and closing operations. In the state where the mold closing operation of the mold clamping device is completed, a predetermined molten material is injected from the injection apparatus into the mold. At this time, the molten material flowing into the mold is generally introduced at a high pressure. Therefore, the mold must be strongly fastened so that the mold is not opened by the high pressure molten material.

Most conventional mold clamping devices are equipped with a fastening means for the strong fastening of the mold. However, the fastening means provided in the conventional clamping device is not suitable for high-speed operation or complicated processing process has the disadvantage of increasing the cost of the device.

In addition, since a large amount of pressurized oil is used for the boosting operation, the tank and the mold cylinder for storing the pressurized oil have to be large, thereby taking up a lot of installation space.

In addition, in the related art, since a hydraulic apparatus is generally used as a conveying means, it is difficult to accurately and easily control the speed and the position of the movable mold when transferring the movable mold. In addition, there is a disadvantage that the flow structure of the hydraulic fluid to form the hydraulic pressure is complicated, the use of the hydraulic oil is increased.

Accordingly, the present invention has been invented to solve the conventional problems as described above, during the transfer operation and the step-up operation, the control is made precisely and quickly, the size of the device can be reduced, taking up less installation space, the transfer operation The overpressure boosting operation is separated so that the feed speed for mold opening and closing can be speeded up.

The present invention comprises a first stationary plate, a second stationary plate fixedly installed at intervals from the first stationary plate, and a movable plate provided to be movable between the first stationary plate and the second stationary plate. In the clamping apparatus of the injection molding machine,

 A column member connected to one side of the movable plate so that the movable plate is movable and provided to be movable through the inside of the second fixed plate;

A ball screw shaft connected to one end of the column member and provided to be rotatable in a receiving groove formed in the column member by receiving power by a driving means;

A ball nut coupled to the ball screw shaft and linearly moved together with the column member in the receiving groove of the column member along a ball screw shaft which is connected to a driving means and receives power;

The column member penetrates and is movably coupled, and consists of a shaped piston provided to form a hydraulic chamber in the second fixed plate.

The driving means has a structure consisting of a motor, a pulley connected to the motor shaft and a pulley coupled to one end of the ball screw shaft to transfer a driving force of the motor to the ball screw shaft.

The motor is a motor capable of forward and reverse driving.

The drive means, by combining the ball screw shaft to be directly rotated, it can be a hollow motor to enable the forward and backward movement of the ball nut.

One side of the shaped piston is a structure that is provided with a fastening member for fixing the column member.

The circumferential surface of the column member has a structure in which a fastening groove is formed along the longitudinal direction so as to ensure locking when the fastening member is operated.

The fastening member is coupled to the guide member driven by a cylinder provided on one side of the fastening member to be moved in the center direction, the guide member is formed with a plurality of guide holes having a curvature in the circumferential direction, the protrusion formed on the fastening member Is inserted to guide movement.

The cylinder is supported by a support on the second fixing plate, the rod of the cylinder is connected to one side of the guide member through the support structure is such that the guide member is rotated in accordance with the movement of the rod.

The fastening member has a gear portion formed on a circumferential surface of a guide member driven by a cylinder provided on one side of the fastening member, and a gear portion driven by a motor is engaged with the gear tooth to rotate the guide member.

The hydraulic chambers are formed on both sides of the mold piston so as to move the mold pistons in opposite directions.

On the other hand, the present invention is another embodiment, the connecting piece is connected to the lower portion of the movable plate, the connecting piece is coupled to the end of the ball screw shaft, the ball screw is coupled to the ball screw shaft, one end of the ball screw shaft, Rotation of the ball nut is a structure provided with a drive means for moving the movable plate in a relatively linear movement of the ball screw shaft.

In addition, as another embodiment of the present invention, a ball nut is provided at a lower portion of the movable plate, and the ball nut is coupled to allow linear movement when the ball screw shaft rotates, and the other end of the ball screw shaft rotates the ball screw shaft. It is a structure provided with a driving means.

As described above, the present invention can save energy by using less pressurized oil, and accordingly, the size of the pressurized oil storage tank and the mold cylinder can be reduced, thereby reducing the installation area of the apparatus, and the transfer operation and the boost operation are separated. As the transfer speed for opening and closing the mold is increased, the clamping force is transmitted evenly, which is advantageous for the protection of the mold, which increases the reliability of the operation, and the speed and the position of the moving die can be easily controlled during the transfer of the moving die, thereby increasing the reliability of the device. It works.

Hereinafter, preferred embodiments of the present invention will be described in detail below based on the accompanying drawings.

1 is a cross-sectional view showing a clamping device of the present invention. As shown in the drawing, the molding apparatus of the injection molding machine according to the present invention basically includes a base member 10 located on the bottom bottom surface of the drawing, and a first fixed mold plate located on the base member 10. 20, a second fixing plate 30 fixedly installed at intervals from the first fixing plate 20, and a tie bar fixed and installed on the first and second fixing plates 20 and 30; 40 and a movable die 50 provided to be movable along the tie bar 40.

In addition, the first stationary plate 20 is provided with a stationary mold part 21, and the movable mold plate 50 is provided with a movable mold part 51.

Here, the present invention is connected to one side of the movable plate 50 so that the movable plate 50 is guided along the tie bar 40, the movable plate 50 is movable through the inside of the second fixed plate 30. A column member 60 provided;

Ball screw shaft 80 is connected to one end of the column member 60 is provided to be rotatable in the receiving groove 61 formed in the column member 60 by receiving power by the drive means 70 and ;

It is coupled to the ball screw shaft 80 and connected to the drive means 70 receives power to the column member 60 in the receiving groove 61 of the column member 60 along the ball screw shaft 80 A bowl nut 82 to be linearly moved together;

As the column member 60 penetrates and is movably coupled to the column member 60, a mold piston 90 is provided to form the hydraulic chambers 31 and 32 in the second fixing plate 30.

In addition, the hydraulic chambers 91 and 92 are provided with a hydraulic unit (not shown) so that hydraulic oil is introduced to form hydraulic pressure.

The driving means 70 is connected to the motor 71, the pulley 74 of the shaft 72 of the motor 71 shaft 72 and the pulley 74 coupled to one end of the ball screw shaft 80, the ball screw It is a structure consisting of a belt 75 for transmitting the driving force of the motor 71 to the shaft (80).

Of course, the motor 71 is a motor capable of forward and reverse driving.

In addition, the present invention is another example of the drive means 70, a hollow motor (not shown) is provided in place of the belt 75 for transmitting the driving force of the motor 71 as described above, and the hollow motor Just by combining the ball screw shaft 80 to rotate, it is the structure that the forward and backward movement of the ball nut 82 is possible.

In addition, one side surface of the shaped piston 90 is provided with a fastening member 100 to fix the column member 60.

In addition, the circumferential surface of the column member 60 is formed with a fastening groove 62 in a predetermined range along the longitudinal direction. The fastening groove 62 allows the locking to be securely performed when the fastening member 100 operates.

In addition, the fastening member 100 is coupled to the guide member 120 driven by the cylinder 110 to be moved in the center direction, in more detail, as shown in Figures 1 and 4 The guide member 120 has a plurality of guide holes 121 having a predetermined curvature in the circumferential direction.

Each of the guide holes 121 is provided with projections 101 formed on the respective fastening members 100 to guide the movement.

The cylinder 110 is supported on the second fixing plate 30 through the support 111, the rod 112 of the cylinder 110 is connected to one side of the guide member 120 through the support 113 The guide member 120 is rotated according to the movement (stretching movement) of the rod 112.

On the other hand, in the present invention, as shown in Figure 7, instead of the cylinder 110 for rotating the guide member 120, a gear tooth 122 is formed on the circumferential surface of the guide member 120, this gear tooth ( The gear part 140 driven by the motor 130 is installed so that the guide member 120 rotates in engagement with the 122.

In addition, as another embodiment of the present invention, as shown in Figure 8, the connecting piece 52 is connected to the lower portion of the movable die 50, the connecting piece 52 is coupled to the end of the ball screw shaft 84 The ball screw shaft 84 is a ball nut 86 is coupled to the structure.

One end of the ball screw shaft 84 is provided with a driving means 150, the driving means 150 has a structure substantially the same as the driving means 70, the motor 151 capable of forward and reverse driving And a shaft 152 provided in the motor 151, a pulley 153 connected to the shaft 152, and a belt 154 so that the belt 154 is connected to the bowl nut 86 to the motor 151. ) By transmitting the power of the ball screw shaft 84 is a structure that allows the relative linear motion of the ball screw shaft 84 by the rotation of the ball nut (86).

In another embodiment, as shown in FIG. 9, the ball nut 53 is integrally connected to the lower portion of the movable die 50, and the ball nut 53 linearly moves when the ball screw shaft 88 rotates. It is coupled to be possible, the end of the ball screw shaft 88 is a structure that is provided with a drive means 160 for rotating the ball screw shaft (88).

The driving means 160, like the driving means 70, has a motor 161 capable of forward and reverse driving, a pulley 163 connected to the shaft 162 of the motor 161, and the pulley ( 163 and the belt 165 connecting the pulley 164 integrally coupled to the end of the ball screw shaft 88.

The motors used in the present invention are all motors capable of forward and reverse driving.

The present invention having such a configuration will be described by dividing into a mold closing process, a molding process and a mold opening process for convenience.

[Mold lung process] (moving motion)

As shown in FIG. 2, the driving force is transmitted by the shaft 72, the pulleys 73, 74, and the belt 75 by the operation of the motor 71 constituting the driving means 70. 80) will rotate. Since the ball screw shaft 80 does not move, but only rotates in place, the ball nut 82 coupled thereto starts to move forward and to the right in the drawing.

Here, the bowl nut 82 is coupled to the receiving groove 61 of the column member 60, so that when the bowl nut 82 moves along the ball screw shaft 80, the column member 60 is also pushed simultaneously and shaped. It moves through the piston 90.

One end of the column member 60 is provided with a movable plate 50, the movable plate 50 is guided by the tie bar 40 to move as shown in Figure 2, the first fixed plate ( 20). The moving mold part 51 of the movable die 50 and the fixed mold part 21 of the first stationary plate 20 are brought close to each other with a slight distance d to prevent the mold.

In this proximity state, as shown in FIG. 3, the column member 60 is clamped and fixed by the operation of the fastening member 100.

4 and 5, when the cylinder 110 is operated, the rod 112 of the cylinder 110 is contracted and the end of the rod 112 and the support stand are fastened. The guide member 120 connected through the 113 is rotated in one direction, and the protrusions 101 of the fastening member 100 are fitted into the plurality of guide holes 121 formed in the guide member 120, respectively. The fastening groove of the column member 60 in which the rod 112 of the 110 moves in the center direction while being guided in the shape of the guide hole 121 having a predetermined curvature as the rod 112 moves. It is fastened to 62.

[Cutting process] (Step-up operation)

The present invention, in the state in which the column member 60 is fixed by the fastening member 100, when the mold process is started, a high-pressure hydraulic fluid is supplied to the hydraulic chamber 31 to push the mold body piston 90, Accordingly, the fastening member 100 provided in the shaped piston 90 is also going to be moved at the same time. At this time, since the fastening member 100 is fastened with the column member 60, the column member 60 is also going to move simultaneously. Then, the ball nut 82 provided in the receiving groove 61 of the column member 60 is also moved together, where the motor 71 is operated again by a control unit (not shown) to allow the ball screw shaft 80 to be moved. By slightly rotating), the ball nut 82 is also moved along the lengthwise direction of the ball screw shaft 80, and accordingly the movable die 50 is moved to make close contact with the fixed die 20 so that the step-up operation is completed. Will be.

[Opening process]

After the molding process is completed, when the injection of the resin and the cooling process of the product are completed, the mold opening process of opening the mold again and retreating the moving mold 50 at high speed is performed.

When the mold opening process is started, first, the pressure by the hydraulic oil of the hydraulic chamber 31 is removed, and the hydraulic oil is supplied to the hydraulic chamber 32 to apply pressure to the mold piston 90 in the direction of the mold clamping process. It acts as a force to move in the opposite direction to release the pressure applied to the movable die 50 and the first fixed plate 20.

In this state, the fastening member 100 is raised to release the fixed state of the column member 60. When the rod 112 is pulled out in the direction opposite to the operation by the operation of the cylinder 110, the guide member 120 Is rotated to the original position while the protrusion 101 of the fastening member 100 is guided by the guide hole 121 of the guide member 120 is moved outward from the center to be opened, accordingly with the column member 60 The fastening state is released.

 The column member 60 in which the fastening state with the fastening member 100 is released is returned to its original position by penetrating and moving through the shape piston 100. The motor 71 constituting the driving means 70 is reversed from the above operation. Ball screw shaft 80 is reversely rotated, and accordingly, the ball nut 82 also moves backward along the longitudinal direction of the ball screw shaft 80 in the direction opposite to the direction during the movement during the clamping process. .

At this time, the movable die 50 connected to the column member 60 is moved to the original position by the tie bar 40 to complete the mold opening process of the mold.

On the other hand, the present invention, as shown in Figure 7, the gear member 122 is formed on a part of the circumferential surface of the guide member 120, and the gear unit 140 is installed to rotate by the motor 130 to engage with it. It can also be configured. Through such a configuration, power transmission can be reliably achieved by the gear.

Of course, the motor 130 is a motor capable of forward and reverse driving.

In addition, the present invention, as shown in Figure 8, by installing the drive means 150, the ball screw shaft 84 and the ball nut 86 in the lower position of the mold clamping device to move the movable die 50 directly as described above The process can be performed.

In other words, when the motor 151 constituting the driving means 150 is operated, power is transmitted through the pulley 153 and the belt 154 while the shaft 152 of the motor 151 rotates, thereby causing the bowlnut 86 to move. ) Will rotate. At this time, the ball nut 86 is rotated in place, the ball screw shaft 84 is coupled to the ball nut 86 is linearly moved, accordingly connected to the end of the ball screw shaft 84 via the connecting piece 52 The movable plate 50 is also moved on the tie bar 40 at the same time.

In addition, as shown in Figure 9, the ball nut (53) integrally fixed to the lower portion of the movable plate 50, combined with the ball screw shaft 88 to form the drive means 160 motor 161 When the ball screw shaft 88 is rotated through the shaft 162, the pulley 163, the belt 165, the pulley 164 by the driving of the ball nut 53 is provided in the lower portion of the movable die 50, By moving linearly along the longitudinal direction of the rotating ball screw shaft 88, the movable die 50 also moves simultaneously.

The other operation process is the same as the above-mentioned process, the detailed description thereof will be omitted below.

1 is a cross-sectional view showing a clamping apparatus of an injection molding machine of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the moving die moves to a fixed plate by moving the driving means in the state of FIG. 1 (moving process).

3 is a cross-sectional view showing a state in which the mold piston is moved by hydraulic pressure in the state of FIG. 2 so that the movable mold part of the movable die is in close contact with the fixed mold portion of the stationary die (pressure boosting process).

4 is a view showing the arrangement of the guide member and the cylinder coupled to the fastening member according to the present invention, a partial cross-sectional view taken along the line A-A of FIG.

FIG. 5 is a view illustrating a state in which the guide member is rotated by the operation of the cylinder in the state of FIG. 4 and the plurality of fastening members are moved toward the center to be narrowed.

FIG. 6 is a view similar to the structure of FIG. 4, illustrating three fastening members.

7 is a view showing another means for rotating the guide member of the present invention.

8 is a cross-sectional view showing a structure in which the driving means, the ball screw shaft and the ball nut are located below the moving mold to move the moving mold as another embodiment of the mold clamping apparatus of the present invention.

Figure 9 is a further embodiment of the mold clamping apparatus of the present invention, a ball nut is provided in the lower portion of the moving die, the ball screw shaft is coupled to the ball nut, the driving means for rotating the ball screw shaft at one end of the ball screw shaft This is a cross-sectional view showing a structure for moving the moving plate is provided.

[Code Description for Drawing]

10: base member

20: first fixed plate

21: fixed mold part

30: second fixing plate

31,32: Hydraulic chamber

40: tie bar

50: moving plate

51: moving mold part

52: connecting piece

53: Ballnut

60: column member

61: receiving home

62: fastening groove

70: drive means

71: motor

72: axis

73,74: pulley

75: belt

80,84,88: ball screw shaft

82,86 ball nuts

90: body piston

91,92: Hydraulic chamber

100: fastening member

101: protrusion

110: cylinder

111,113 support

112: load

120: guide member

121: guide ball

122: gear tooth

130: motor

140: gear unit

150: driving means

151: motor

152: axis

153: pulley

154: Belt

160: driving means

161: motor

162: axis

163,164; Pulley

165: belt

Claims (12)

The first fixed plate 20, A second fixing plate 30 fixedly installed at intervals from the first fixing plate 20, and In the clamping apparatus of the injection molding machine consisting of a movable mold 50 which is provided to be movable between the first fixed mold 20 and the second fixed mold 30,  A column member 60 connected to one side of the movable plate 50 so that the movable plate 50 is movable and movable through the inside of the second fixed plate 30; Ball screw shaft 80 is connected to one end of the column member 60 is provided to be rotatable in the receiving groove 61 formed in the column member 60 by receiving power by the drive means 70 and ; The column member 60 in the receiving groove 61 of the column member 60 along the ball screw shaft 80 is coupled to the ball screw shaft 80 and connected to the drive means 70 receives power A bowl nut 82 provided to be linearly moved together; The column member 60 of the injection molding machine, characterized in that consisting of a mold piston 90 is provided so that the hydraulic chamber 31, 32 is formed in the second fixing plate 30 while being movably coupled to the column member 60. Clamping device. The method according to claim 1, The driving means 70 is connected to a motor 71, a pulley 73 connected to the shaft 72 of the motor 71 and a pulley 74 coupled to one end of the ball screw shaft 80 to the ball. Molding apparatus of the injection molding machine, characterized in that consisting of a belt 75 for transmitting the driving force of the motor 71 to the screw shaft (80). The method according to claim 2, The motor 71 is a molding apparatus of an injection molding machine, characterized in that the motor capable of forward and reverse driving. The method according to claim 1, The drive means (70), by combining the ball screw shaft (80) to rotate directly, the molding apparatus of the injection molding machine, characterized in that the hollow motor to enable the forward and backward movement of the ball nut (82). The method according to claim 1, Molding apparatus of the injection molding machine, characterized in that the fastening member 100 for fixing the column member 60 on one side of the mold piston (90). The method according to claim 1 or 5, Clamping apparatus of the injection molding machine, characterized in that the fastening groove 62 is formed along the longitudinal direction on the circumferential surface of the column member 60 so as to ensure locking when the fastening member 100 operates. The method according to claim 6, The fastening member 100 is coupled to the guide member 120 driven by the cylinder 110 provided on one side of the fastening member 100 to be moved in the center direction, the guide member 120 in the circumferential direction A plurality of guide holes (121) having a curvature are formed, the clamping device of the injection molding machine, characterized in that the projection 101 formed in the fastening member 100 is fitted to guide movement. The method according to claim 7, The cylinder 110 is supported on the second fixing plate 30 through the support 111, the rod 112 of the cylinder 110 is connected to one side of the guide member 120 through the support 113 The clamping apparatus of the injection molding machine, characterized in that the guide member 120 is rotated according to the movement of the rod (112). The method according to claim 6, The fastening member 100, the gear tooth 122 is formed on the circumferential surface of the guide member 120 driven by the cylinder 100 provided on one side of the fastening member 100, the gear tooth 122 The clamping device of the injection molding machine, characterized in that the gear portion 140 is driven by the motor 130 is installed so that the guide member 120 is rotated in engagement with. The method according to claim 1, The hydraulic chambers 31 and 32 are respectively formed on both sides of the mold piston 90 so as to move the mold pistons 90 in opposite directions to each other. The method according to claim 1, The connecting piece 52 is connected to the lower portion of the movable plate 50, the connecting piece 52 is coupled to the end of the ball screw shaft 84, the ball nut 86 is coupled to the ball screw shaft 84 In addition, the driving means 150 is provided at one end of the ball screw shaft 84 to rotate the bowl nut 86 so that the movable die 50 can be moved by relatively linear movement of the ball screw shaft 84. Clamping apparatus of injection molding machine. The method according to claim 1, A ball nut 53 is provided at a lower portion of the movable plate 50, and the ball nut 53 is coupled to allow linear movement during rotation of the ball screw shaft 88, and at the end of the ball screw shaft 88. Molding apparatus of the injection molding machine, characterized in that the drive means for rotating the ball screw shaft (88) (160) is provided.

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