JP2014195964A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine which can maintain mold clamping force balance.SOLUTION: An injection molding machine includes a platen 13 to which a mold 33 is mounted, and a platen support part 43 which supports the platen 13 at a plurality positions having different distances from a frame 11. The platen support part 43 suppresses transmission of a turning moment from the platen 13.

Description

  The present invention relates to an injection molding machine.

  The injection molding machine includes a mold clamping device that performs mold closing, mold clamping, and mold opening of a mold device that fills a molding material (see, for example, Patent Document 1). The mold apparatus is composed of, for example, a fixed mold and a movable mold. A molded product is formed by filling a cavity space formed between a fixed mold and a movable mold in a clamped state with a molding material.

JP 2004-249637 A

  Conventionally, the quality of a molded product sometimes deteriorates, for example, the balance of mold clamping force is lost and burrs are generated around the molded product.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection molding machine capable of maintaining the balance of clamping force.

In order to solve the above problems, according to one aspect of the present invention,
A platen to which the mold is attached;
A platen support part for supporting the platen at a plurality of positions at different distances from the frame,
The platen support part is provided with an injection molding machine that suppresses transmission of a rotational moment from the platen.

  ADVANTAGE OF THE INVENTION According to this invention, the injection molding machine which can maintain the balance of clamping force is provided.

It is a figure which shows the state at the time of mold closing completion of the injection molding machine by 1st Embodiment of this invention. It is a figure which shows the state at the time of the mold opening completion of the injection molding machine by 1st Embodiment of this invention. It is a figure which shows the movable platen and movable platen support part by 2nd Embodiment of this invention. It is a figure which shows the movable platen and movable platen support part by 3rd Embodiment of this invention. It is a figure which shows the movable platen and movable platen support part by 4th Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof will be omitted. Further, a description will be given assuming that the moving direction of the movable platen when performing mold closing is the front and the moving direction of the movable platen when performing mold opening is the rear. Also, a description will be given assuming that the direction perpendicular to the frame is the up-down direction. The front-rear direction, the up-down direction, and the left-right direction are directions perpendicular to each other. The injection molding machine according to the present embodiment is a horizontal type, but may be a vertical type.

[First Embodiment]
FIG. 1 is a view showing a state at the completion of mold closing of the injection molding machine according to the first embodiment of the present invention. FIG. 2 is a view showing a state when the mold opening of the injection molding machine according to the first embodiment of the present invention is completed.

  The injection molding machine includes a mold clamping device 10 that performs mold closing, mold clamping, and mold opening of the mold apparatus 30. The mold apparatus 30 includes a fixed mold 32 and a movable mold 33, for example. The mold apparatus 30 is maintained at a predetermined temperature by a mold temperature controller.

  The mold clamping device 10 includes a frame 11, a fixed platen 12, a movable platen 13, a rear platen 15 as a mold clamping member, a tie bar 16 as a connecting member, a toggle mechanism 20, a mold clamping motor 21, and the like.

  The fixed platen 12 is supported by a fixed platen support portion 42, and the fixed platen support portion 42 is fixed to the frame 11. The fixed mold 32 is attached to the mold mounting surface of the fixed platen 12. The fixed platen support portion 42 of this embodiment is formed separately from the fixed platen 12, but may be formed integrally with the fixed platen 12.

  The movable platen 13 is supported by a movable platen support portion 43, and the movable platen support portion 43 is fixed to a guide block 14 that is movable along a guide (for example, a guide rail) 17 laid on the frame 11. Thereby, the movable platen 13 can be moved forward and backward with respect to the frame 11. A movable mold 33 is attached to the mold attachment surface of the movable platen 13. Although the movable platen support portion 43 of the present embodiment is formed separately from the movable platen 13, it may be formed integrally with the movable platen 13.

  The rear platen 15 is disposed behind the movable platen 13 and is supported by the rear platen support portion 45. The rear platen support portion 45 is placed on the frame 11 so as to freely advance and retract. The rear platen support portion 45 of the present embodiment is formed separately from the rear platen 15, but may be formed integrally with the rear platen 15.

  The toggle mechanism 20 is disposed between the movable platen 13 and the rear platen 15. The toggle mechanism 20 includes, for example, a cross head 20 a that can move forward and backward with respect to the frame 11 and a plurality of links that transmit a propulsive force input to the cross head 20 a to the movable platen 13.

  The mold clamping motor 21 includes a ball screw mechanism as a motion converting unit that converts a rotational motion into a linear motion. The cross shaft 20 a is advanced and retracted by moving the drive shaft 22 forward and backward, and the toggle mechanism 20 is operated.

  Next, the operation of the mold clamping apparatus 10 having the above-described configuration will be described with reference to FIGS. 1 and 2.

  When the mold clamping motor 21 is driven in the state shown in FIG. 2 to advance the crosshead 20a and the toggle mechanism 20 is operated, the movable platen 13 is advanced, and the movable mold 33 and the fixed mold are moved. 32 comes into contact with each other and the mold closing is completed.

  After the mold closing is completed, the mold clamping motor 21 is driven to generate a mold clamping force obtained by multiplying the propulsive force of the mold clamping motor 21 by the toggle magnification.

  A cavity space is formed between the fixed mold 32 and the movable mold 33 in the clamped state. The cavity space is filled with a liquid molding material (for example, molten resin), and the filled molding material is solidified to form a molded product.

  Thereafter, when the mold clamping motor 21 is driven to retract the cross head 20a and operate the toggle mechanism 20, the movable platen 13 is retracted and the mold is opened. After the mold opening is completed, the molded product is ejected from the movable mold 33.

  The mold clamping device 10 of the present embodiment uses a toggle mechanism to generate a mold clamping force. However, without using the toggle mechanism, the driving force generated by the mold clamping motor can be directly used as a mold clamping force to move the platen. 13 may be transmitted. The mold clamping device may transmit the propulsive force generated by the fluid pressure cylinder directly to the movable platen as the mold clamping force. Further, the mold clamping device may perform mold opening / closing by a linear motor and mold clamping by an electromagnet.

Next, the fixed platen support portion 42 will be described.
The fixed platen support portion 42 supports the side surface of the fixed platen 12. The fixed platen support portions 42 may be provided on both the left and right sides of the center position of the fixed platen 12 (specifically, the center position of the mounting positions of the plurality of tie bars 16 on the fixed platen 12). The fixed platen support 42 may support a surface (front end surface) opposite to the mold mounting surface (rear end surface) of the fixed platen 12.

  The fixed platen support part 42 supports the fixed platen 12 from the side, and forms a gap between the frame 11 and the fixed platen 12. The fixed platen 12 can be thermally deformed in both the upper and lower directions, and the center position of the fixed platen 12 with respect to the frame 11 is unlikely to be shifted up and down due to the temperature change of the fixed platen 12. Further, the heat supplied from the fixed mold 32 to the fixed platen 12 is difficult to move to the frame 11 via the lower surface of the fixed platen 12. Therefore, the temperature distribution of the fixed platen 12 tends to be vertically symmetric, and the warpage of the fixed platen 12 can be suppressed.

  The fixed platen support portion 42 supports the fixed platen 12 at a plurality of points when a rotational moment is applied to the fixed platen 12 during mold clamping or the like, and suppresses the inclination of the fixed platen 12 with respect to the frame 11.

  The fixed platen support part 42 supports the fixed platen 12 at a plurality of (for example, two) positions having different distances from the frame 11. For example, the fixed platen support portion 42 includes a first connection portion 42 b and a second connection portion 42 c that are connected at one end to the fixed platen 12. One end of the first connection portion 42b and one end of the second connection portion 42c are connected to the fixed platen 12 at positions where the distance from the frame 11 is different.

  There are a plurality of positions in which the fixed platen support 42 supports the fixed platen 12 in the vertical direction, and the rotation of the fixed platen 12 with the horizontal axis (the direction orthogonal to the paper surface in the drawing) as the rotation axis is compared with the case where only one is present. Can be suppressed. Therefore, the inclination of the fixed platen 12 with respect to the frame 11 can be suppressed. The parallelism between the fixed mold 32 and the movable mold 33 can be maintained, and the balance of mold clamping force can be maintained. The plurality of positions at which the fixed platen support portion 42 supports the fixed platen 12 may include a position close to the frame 11 and a position far from the frame 11 with respect to the center position of the fixed platen 12 and are vertically symmetrical positions. Good. The warp of the fixed platen 12 tends to be vertically symmetric.

  One end of the first connection portion 42b is configured by a pin joint or the like, and is connected to the fixed platen 12 so as to be rotatable. Therefore, the transmission of the rotational moment from the fixed platen 12 to the fixed platen support 42 can be suppressed as compared with the case where one end portion of the first connection portion 42b is connected to the fixed platen 12 so as not to rotate. The inclination of the fixed platen support part 42 with respect to the frame 11 can be suppressed, and consequently the inclination of the fixed platen 12 with respect to the frame 11 can be suppressed. In addition, the one end part of the 1st connection part 42b may be comprised with a bearing etc. instead of a pin joint.

  Similarly, one end portion of the second connection portion 42 c is configured by a pin joint or the like, and is connected to the fixed platen 12 so as to be relatively rotatable. Therefore, the transmission of the rotational moment from the fixed platen 12 to the fixed platen support 42 can be suppressed as compared with the case where one end of the second connection portion 42c is connected to the fixed platen 12 so as not to rotate. The inclination of the fixed platen support portion 42 with respect to the frame 11 can be suppressed, and consequently the inclination of the fixed platen 12 with respect to the frame 11 can be suppressed. In addition, the one end part of the 2nd connection part 42c may be comprised by the bearing etc. instead of the pin joint.

  In the present embodiment, both the one end portion of the first connection portion 42b and the one end portion of the second connection portion 42c are rotatably connected to the fixed platen 12, but one of them is fixed. The platen 12 may be connected so as to be rotatable relative to the platen 12.

  The fixed platen support portion 42 may include a guide 42d that is in contact with the other end portion of the second connection portion 42c so as to be relatively movable in the vertical direction. The guide 42d is fixed to the column portion 42a, and the column portion 42a is fixed to the frame 11 and extends upward from the frame 11. The other end portion of the first connection portion 42b is fixed to the column portion 42a. Since the other end portion of the first connection portion 42b and the other end portion of the second connection portion 42c can move relative to each other in the vertical direction and absorb the rotational moment, the rotational moment is transmitted from the fixed platen 12 to the fixed platen support portion 42. Can be suppressed.

  Note that the fixed platen support portion 42 of the present embodiment has two connection portions whose one end portions are rotatably connected to the fixed platen 12, but may have three or more. In addition, the fixed platen support portion 42 of the present embodiment has one guide that comes into contact with the other end of the connection portion so as to be relatively movable, but may have two or more guides.

Next, the movable platen support portion 43 will be described.
The movable platen support 43 supports the side surface of the movable platen 13. The movable platen support 43 may be provided on both the left and right sides with the center position of the movable platen 13 (specifically, the center positions of a plurality of attachment positions of the toggle mechanism on the movable platen 13). The movable platen support 43 may support a surface (rear end surface) opposite to the mold mounting surface (front end surface) of the movable platen 13.

  The movable platen support part 43 supports the movable platen 13 from the side, and forms a gap between the guide block 14 or the frame 11 and the movable platen 13. The movable platen 13 can be thermally deformed in both the upper and lower directions, and the center position of the movable platen 13 with respect to the frame 11 is unlikely to be shifted up and down due to the temperature change of the movable platen 13. Further, the heat supplied from the movable mold 33 to the movable platen 13 is difficult to move to the frame 11 via the lower surface of the movable platen 13. Therefore, the temperature distribution of the movable platen 13 tends to be vertically symmetric, and the warp of the movable platen 13 can be suppressed.

  The movable platen support unit 43 supports the movable platen 13 at a plurality of points when a rotational moment is applied to the movable platen 13 during mold clamping, and suppresses the inclination of the movable platen 13 with respect to the frame 11.

  The movable platen support part 43 supports the movable platen 13 at a plurality of (for example, two) positions having different distances from the frame 11. For example, the movable platen support portion 43 includes a first connection portion 43 b and a second connection portion 43 c that are connected at one end to the movable platen 13. One end of the first connection portion 43b and one end of the second connection portion 43c are connected to the movable platen 13 at a position where the distance from the frame 11 is different.

  There are a plurality of positions in which the movable platen support 43 supports the movable platen 13 in the vertical direction, and the rotation of the movable platen 13 with the horizontal axis (the direction orthogonal to the paper surface in the drawing) as the rotation axis is compared to the case where only one is present. Can be suppressed. Therefore, the inclination of the movable platen 13 with respect to the frame 11 can be suppressed. The parallelism between the movable mold 33 and the fixed mold 32 can be maintained, and the balance of mold clamping force can be maintained. The plurality of positions at which the movable platen support 43 supports the movable platen 13 may include a position close to the frame 11 and a position far from the frame 11 with respect to the center position of the movable platen 13, and are vertically symmetrical positions. Good. The warp of the movable platen 13 tends to be vertically symmetric.

  One end portion of the first connection portion 43b is configured by a pin joint or the like, and is connected to the movable platen 13 so as to be rotatable. Therefore, the transmission of the rotational moment from the movable platen 13 to the movable platen support 43 can be suppressed as compared with the case where one end of the first connection portion 43b is connected to the movable platen 13 so as not to rotate. The inclination of the movable platen support 43 with respect to the frame 11 can be suppressed, and consequently the inclination of the movable platen 13 with respect to the frame 11 can be suppressed. In addition, the one end part of the 1st connection part 43b may be comprised with a bearing etc. instead of a pin joint.

  Similarly, one end portion of the second connection portion 43c is configured by a pin joint or the like, and is connected to the movable platen 13 so as to be relatively rotatable. Therefore, the transmission of the rotational moment from the movable platen 13 to the movable platen support 43 can be suppressed as compared with the case where one end of the second connection portion 43c is connected to the movable platen 13 so as not to rotate. The inclination of the movable platen support 43 with respect to the frame 11 can be suppressed, and consequently the inclination of the movable platen 13 with respect to the frame 11 can be suppressed. In addition, the one end part of the 2nd connection part 43c may be comprised with the bearing etc. instead of the pin joint.

  In the present embodiment, both the one end portion of the first connection portion 43b and the one end portion of the second connection portion 43c are rotatably connected to the movable platen 13, but one of them is movable. The platen 13 may be connected so as to be rotatable relative to the platen 13.

  The movable platen support portion 43 may include a guide 43d that contacts the other end portion of the second connection portion 43c so as to be relatively movable in the vertical direction. The guide 43d is fixed to the pillar portion 43a, and the pillar portion 43a is fixed to the guide block 14 and extends upward from the guide block 14. The other end portion of the first connection portion 43b is fixed to the column portion 43a. Since the other end portion of the first connection portion 43b and the other end portion of the second connection portion 43c can move relative to each other in the vertical direction and absorb the rotational moment, the transmission of the rotational moment from the movable platen 13 to the movable platen support portion 43 is transmitted. Can be suppressed.

  In addition, although the movable platen support part 43 of this embodiment has two connection parts in which one end part is rotatably connected with respect to the movable platen 13, it may have three or more. In addition, the movable platen support portion 43 of the present embodiment has one guide that comes into contact with the other end of the connection portion so as to be relatively movable, but may have two or more.

Next, the rear platen support portion 45 will be described.
The rear platen support portion 45 supports the side surface of the rear platen 15. The rear platen support portions 45 may be provided on both the left and right sides of the center position of the rear platen 15 (specifically, the center position of the mounting positions of the plurality of tie bars 16 on the rear platen 15). The rear platen support 45 may support the front end surface or the rear end surface of the rear platen 15.

  The rear platen support portion 45 supports the rear platen 15 from the side and forms a gap between the frame 11 and the rear platen 15. The rear platen 15 can be thermally deformed in both the upper and lower directions, and the center position of the rear platen 15 with respect to the frame 11 is not easily displaced up and down due to the temperature change of the rear platen 15. Further, the heat of the rear platen 15 is difficult to move to the frame 11 via the lower surface of the rear platen 15. Therefore, the temperature distribution of the rear platen 15 tends to be vertically symmetric, and the warp of the rear platen 15 can be suppressed.

  The rear platen support portion 45 supports the rear platen 15 at a plurality of points when a rotational moment acts on the rear platen 15 during mold clamping or the like, and suppresses the inclination of the rear platen 15 with respect to the frame 11.

  The rear platen support 45 supports the rear platen 15 at a plurality of (for example, two) positions with different distances from the frame 11. For example, the rear platen support portion 45 includes a first connection portion 45 b and a second connection portion 45 c that are connected at one end to the rear platen 15. One end of the first connecting portion 45b and one end of the second connecting portion 45c are connected to the rear platen 15 at positions where the distance from the frame 11 is different.

  There are a plurality of positions in which the rear platen support 45 supports the rear platen 15 in the vertical direction, and the rotation of the rear platen 15 having the rotation axis in the left-right direction (the direction orthogonal to the paper surface in the drawing) can be suppressed as compared with the case where there is only one position. Therefore, the inclination of the rear platen 15 with respect to the frame 11 can be suppressed. Changes in the posture of the toggle mechanism can be suppressed, and the balance of mold clamping force can be maintained. The plurality of positions at which the rear platen support 45 supports the rear platen 15 may include a position close to the frame 11 and a position far from the frame 11 with respect to the center position of the rear platen 15, and may be positions that are vertically symmetrical. The warp of the rear platen 15 tends to be vertically symmetric.

  One end portion of the first connection portion 45b is configured by a pin joint or the like, and is connected to the rear platen 15 so as to be rotatable. Therefore, the transmission of the rotational moment from the rear platen 15 to the rear platen support 45 can be suppressed as compared with the case where one end of the first connecting portion 45b is connected to the rear platen 15 so as not to rotate. The inclination of the rear platen support 45 with respect to the frame 11 can be suppressed, and consequently the inclination of the rear platen 15 with respect to the frame 11 can be suppressed. In addition, the one end part of the 1st connection part 45b may be comprised with a bearing etc. instead of a pin joint.

  Similarly, one end of the second connection portion 45c is configured by a pin joint or the like, and is connected to the rear platen 15 so as to be rotatable. Therefore, the transmission of the rotational moment from the rear platen 15 to the rear platen support 45 can be suppressed as compared with the case where one end of the second connection portion 45c is connected to the rear platen 15 so as not to rotate. The inclination of the rear platen support 45 with respect to the frame 11 can be suppressed, and consequently the inclination of the rear platen 15 with respect to the frame 11 can be suppressed. In addition, the one end part of the 2nd connection part 45c may be comprised with the bearing etc. instead of the pin joint.

  In the present embodiment, both the one end portion of the first connecting portion 45b and the one end portion of the second connecting portion 45c are connected to the rear platen 15 so as to be rotatable relative to each other. May be connected so as to be relatively rotatable.

  The rear platen support portion 45 may have a guide 45d that comes into contact with the other end portion of the second connection portion 45c so as to be relatively movable in the vertical direction. The guide 45d is fixed to the pillar portion 45a, and the pillar portion 45a is placed on the frame 11 so as to be able to advance and retreat, and extends upward from the frame 11. The other end portion of the first connection portion 45b is fixed to the column portion 45a. Since the other end portion of the first connection portion 45b and the other end portion of the second connection portion 45c can move relative to each other in the vertical direction and absorb the rotational moment, transmission of the rotational moment from the rear platen 15 to the rear platen support portion 45 is suppressed. it can.

  Note that the rear platen support portion 45 of the present embodiment has two connection portions whose one end portions are rotatably connected to the rear platen 15, but may have three or more. In addition, the rear platen support portion 45 of the present embodiment has one guide that comes into contact with the other end of the connecting portion so as to be relatively movable, but may have two or more guides.

[Second Embodiment]
FIG. 3 is a view showing a movable platen and a movable platen support according to the second embodiment of the present invention. The movable platen support part 143 supports the side surface of the movable platen 113 to which the movable mold 133 is attached. The movable platen support 143 may be provided on both the left and right sides with the center position of the movable platen 113 (specifically, the center positions of a plurality of mounting positions of the toggle mechanism on the movable platen 113). The movable platen support 143 may support a surface (rear end surface) opposite to the mold mounting surface (front end surface) of the movable platen 113.

  The movable platen support part 143 supports the movable platen 113 from the side, and forms a gap between the frame 111 and the like and the movable platen 113. The movable platen 113 can be thermally deformed in both the upper and lower directions, and the center position of the movable platen 113 with respect to the frame 111 is not easily displaced up and down due to the temperature change of the movable platen 113. Further, it is difficult for the heat of the movable platen 113 to move to the frame 111 via the lower surface of the movable platen 113. Therefore, the temperature distribution of the movable platen 113 tends to be vertically symmetric, and the warp of the movable platen 113 can be suppressed.

  The movable platen support unit 143 supports the movable platen 113 at a plurality of points when a rotational moment is applied to the movable platen 113 during mold clamping, and suppresses the inclination of the movable platen 113 with respect to the frame 111.

  The movable platen support part 143 supports the movable platen 113 at a plurality of (for example, two) positions with different distances from the frame 111. For example, the movable platen support portion 143 includes a first connecting portion 151 and a second connecting portion 152 that are connected to the movable platen 113 at positions where the distance from the frame 111 is different.

  There are a plurality of positions where the movable platen support unit 143 supports the movable platen 113 in the vertical direction, and the rotation of the movable platen 113 with the rotation axis in the left-right direction (the direction orthogonal to the paper surface in the drawing) is compared to the case where there is only one position. Can be suppressed. The inclination of the movable platen 113 with respect to the frame 111 can be suppressed. Therefore, the gap formed between the movable platen 113 and the rear platen when the mold closing is completed is vertically symmetric so that the balance of the suction force can be maintained and the balance of the mold clamping force can be maintained. The plurality of positions at which the movable platen support 143 supports the movable platen 113 may include a position close to the frame 111 and a position far from the frame 111 with respect to the center position of the movable platen 113, and are vertically symmetrical positions. Good. The warp of the movable platen 113 tends to be vertically symmetric.

  The movable platen support portion 143 is a guide that is movably contacted with each of the first guide block 151 a that is the other end portion of the first connecting portion 151 and the second guide block 152 a that is the other end portion of the second connecting portion 152. 153 is further included. The guide 153 is fixed to the frame 111. Since the first guide block 151a and the second guide block 152a can move relative to each other in the front-rear direction and absorb the rotational moment, transmission of the rotational moment from the movable platen 113 to the movable platen support portion 143 can be suppressed.

  The first connecting portion 151 includes a first guide block 151 a, a first column portion 151 b extending upward from the first guide block 151 a, and a first arm portion 151 c that connects the first column portion 152 b and the movable platen 113. Note that one end of the first connecting portion 151 of the present embodiment is connected to the movable platen 113 so as not to rotate, but is connected to the movable platen 113 so as to be rotatable. Also good.

  The second connecting portion 152 includes a second guide block 152a, a second column portion 152b extending upward from the second guide block 152a, and a second arm portion 152c that connects the second column portion 152b and the movable platen 113. Note that one end of the second connecting portion 152 of the present embodiment is connected to the movable platen 113 so as not to rotate, but is connected to the movable platen 113 so as to be rotatable. Also good.

  Since the first column portion 151b is longer than the second column portion 152b, the first column portion 151b may be formed thicker than the second column portion 152b. The rigidity of the first connecting portion 151 and the rigidity of the second connecting portion 152 are approximately the same, and the warp of the movable platen 113 is likely to be vertically symmetrical about the center position of the movable platen 113. The first arm portion 151c may be thicker than the second arm portion 152c.

  Further, since the first column portion 151b is longer than the second column portion 152b, the first column portion 151b may be disposed at a position closer to the movable platen 113 than the second column portion 152b. That is, the first arm portion 151c may be shorter than the second arm portion 152c. The rigidity of the first connecting portion 151 and the rigidity of the second connecting portion 152 are approximately the same, and the warp of the movable platen 113 is likely to be vertically symmetrical about the center position of the movable platen 113. The first arm portion 151c may not be provided, and the upper end portion of the first column portion 151b may be connected to the movable platen 113.

  Note that the movable platen support portion 143 of the present embodiment has two connecting portions whose one end portions are connected to the movable platen 113, but may have three or more. Moreover, although the movable platen support part 143 of this embodiment has one contact part which contacts the other end part of a connection part movably, you may have multiple.

  Although the present embodiment has been described with respect to the movable platen support, it can also be applied to a fixed platen support and a rear platen support.

  For example, the fixed platen support portion is relatively opposite to the first connection portion and the second connection portion, each of which has one end portion connected to the fixed platen at a position where the distance from the frame is different, and the other end portion of the first connection portion. And a guide that is movably in contact. By the guide, the other end portion of the first connecting portion and the other end portion of the second connecting portion are relatively movable. The other end portion of the first connecting portion may be placed on the frame so as to freely advance and retract. The other end of the second connecting portion is fixed to the frame. A frame may be included in the stationary platen support.

  The rear platen support portion includes a first connecting portion and a second connecting portion, each of which is connected at one end portion to the rear platen at a different distance from the frame, and the other end portion and the second connecting portion of the first connecting portion. And a guide that comes into relative movement with each of the other end portions of the portion. By the guide, the other end portion of the first connecting portion and the other end portion of the second connecting portion are relatively movable. The other end portion of the first connecting portion and the other end portion of the second connecting portion may be placed on the frame independently of each other. A frame may be included in the rear platen support.

[Third Embodiment]
FIG. 4 is a view showing a movable platen and a movable platen support according to a third embodiment of the present invention. The movable platen support portion 243 supports a surface (rear end surface) and a lower surface opposite to the mold mounting surface (front end surface) of the movable platen 213. The movable platen support 243 may support the side surface instead of the rear end surface of the movable platen 213.

  The movable platen support 243 supports the movable platen 213 at a plurality of points when a rotational moment is applied to the movable platen 213 during mold clamping or the like, and suppresses the inclination of the movable platen 213 with respect to the frame 211.

  The movable platen support 243 supports the movable platen 213 at a plurality of (for example, two) positions with different distances from the frame 211. For example, the movable platen support portion 243 includes a first connection portion 251 and a second connection portion 252 that are connected to the movable platen 213 at positions where the distances from the frame 211 are different from each other.

  There are a plurality of positions where the movable platen support 243 supports the movable platen 213 in the vertical direction, and the rotation of the movable platen 213 with the rotation axis in the left-right direction (the direction orthogonal to the paper surface in the drawing) is compared to the case where there is only one position. Can be suppressed. The inclination of the movable platen 213 with respect to the frame 211 can be suppressed. Therefore, the gap formed between the movable platen 213 and the rear platen when the mold closing is completed is vertically symmetric so that the balance of the suction force can be maintained and the balance of the mold clamping force can be maintained. The plurality of positions at which the movable platen support unit 243 supports the movable platen 213 may include a position close to the frame 211 and a position far from the frame 211 with respect to the center position of the movable platen 213, and are vertically symmetrical positions. Good. The warp of the movable platen 213 tends to be vertically symmetric.

  The first connecting portion 251 includes a column portion 251 a that extends upward from the guide block 253, and an arm portion 251 b that connects the column portion 251 a and the movable platen 213.

  One end of the first connecting portion 251 is connected to the rear end surface of the movable platen 213 so as not to be relatively rotatable. Note that one end of the first connecting portion 251 may be connected to the rear end surface of the movable platen 213 so as to be relatively rotatable.

  The other end of the first connecting portion 251 is fixed to the guide block 253.

  The second connecting portion 252 connects the guide block 253 movable along the guide 217 laid on the frame 211 and the movable platen 213.

  One end of the second connecting portion 252 is connected to the lower surface of the movable platen 213 so as not to rotate. Note that one end portion of the second connecting portion 252 may be relatively rotatably connected to the lower surface of the movable platen 213.

  The other end of the second connecting portion 252 is placed on the guide block 253 so as to be relatively movable. Thereby, the other end part of the 1st connection part 251 and the other end part of the 2nd connection part 252 are made relatively movable. Note that the other end of the second connecting portion 252 may come into contact with a guide laid on the guide block 253 so as to be relatively movable.

  The other end of the first connecting portion 251 may be movable relative to the guide block 253, and the other end of the second connecting portion 252 may be fixed to the guide block 253.

  The first connecting portion 251, the second connecting portion 252, and the guide block 253 constitute a movable platen support portion 243.

  The second connecting portion 252 may not be provided. For example, the other end portion of the first connecting portion 251 may be fixed to the guide block 253, and the guide block 253 may contact the movable platen 213 so as to be relatively movable. Further, the movable platen 213 may be fixed to the guide block 253, and the other end of the first connecting portion 251 may be relatively movable with respect to the guide block 253. In either case, the rotational moment can be absorbed.

  Although the present embodiment has been described with respect to the movable platen support, it can also be applied to a fixed platen support and a rear platen support.

  For example, the fixed platen support portion may support the fixed platen from the front and the lower side, and may include a connection portion having one end connected to the fixed platen, and a frame that contacts the fixed platen. The other end of the connecting portion may be fixed to the frame, and the frame may contact the fixed platen so as to be relatively movable. Further, the other end portion of the connecting portion may be movable relative to the frame, and the fixed platen may be fixed to the frame. Absorbs rotational moment. The fixed platen support part may support the fixed platen from the side and the lower side, or may support the fixed platen from the side, the front and the lower side.

  The rear platen support portion may support the rear platen from the rear and the lower side, and may include a connecting portion whose one end portion is connected to the fixed platen, and a frame that contacts the rear platen. The other end of the connecting portion may be relatively movable with respect to the frame, and the frame may contact the rear platen so as to be relatively movable. Absorbs rotational moment. The rear platen support part may support the rear platen from the side and the lower side, or may support the rear platen from the side, the rear and the lower side.

[Fourth Embodiment]
FIG. 5 is a view showing a movable platen and a movable platen support according to a fourth embodiment of the present invention.

  The movable platen support 343 supports a surface (rear end surface) opposite to the mold mounting surface (front end surface) of the movable platen 313. The movable platen support 343 may be provided on both the left and right sides with the center position of the movable platen 313 interposed therebetween. The movable platen support portion 343 may support the side surface of the movable platen 313.

  The movable platen support portion 343 supports the movable platen 313 from the rear, and forms a gap between the guide block 314 or the frame 311 and the movable platen 313. The movable platen 313 can be thermally deformed in both the upper and lower directions, and the center position of the movable platen 313 with respect to the frame 311 is not easily displaced up and down due to the temperature change of the movable platen 313. Further, the heat supplied from the movable mold to the movable platen 313 does not easily move to the frame 311 via the lower surface of the movable platen 313. Therefore, the temperature distribution of the movable platen 313 tends to be vertically symmetric, and the warp of the movable platen 313 can be suppressed.

  The movable platen support portion 343 supports the movable platen 313 at a plurality of points when a rotational moment acts on the movable platen 313 during mold clamping or the like, and suppresses the inclination of the movable platen 313 with respect to the frame 311.

  The movable platen support portion 343 supports the movable platen 313 at a plurality of (for example, two) positions having different distances from the frame 311. For example, the movable platen support part 343 connects the column part 343a that is fixed to the guide block 314 and extends upward, the first arm part 343b that connects the column part 343a and the movable platen 313, and the column part 343a and the movable platen 313. Second arm portion 343c. The column portion 343a is not in contact with the movable platen 313, and one end portion of the first arm portion 343b and one end portion of the second arm portion 343c are connected to the movable platen 313 at a position where the distance from the frame 311 is different.

  There are a plurality of positions where the movable platen support portion 343 supports the movable platen 313 in the vertical direction, and the rotation of the movable platen 313 with the rotation axis in the left-right direction (the direction orthogonal to the paper surface in the drawing) is compared to the case where there is only one position. Can be suppressed. Therefore, the inclination of the movable platen 313 with respect to the frame 311 can be suppressed. The parallelism between the movable mold and the fixed mold can be maintained, and the balance of mold clamping force can be maintained. The plurality of positions at which the movable platen support 343 supports the movable platen 313 may include a position close to the frame 311 and a position far from the frame 311 with respect to the center position of the movable platen 313, and are vertically symmetrical positions. Good. The warp of the movable platen 313 tends to be vertically symmetric.

  The movable platen support 343 may be configured similarly to the movable platen support 43 of the first embodiment, the movable platen support 143 of the second embodiment, or the movable platen support 243 of the third embodiment. .

  The movable platen 313 has a groove portion 313a as a deforming portion that is deformed so as to absorb a rotational moment acting on the movable platen 313. The groove 313a may penetrate the movable platen 313 in the left-right direction (the direction perpendicular to the paper surface in the drawing). The rotational moment is absorbed by the deformation of the groove portion 313a, and the rotational moment transmitted from the movable platen 313 to the movable platen support portion 343 is small. The inclination of the movable platen support portion 343 with respect to the frame 311 can be suppressed, and consequently the inclination of the movable platen 313 with respect to the frame 311 can be suppressed.

  The groove 313a may be formed at a position where the center position of the movable platen 313 and the frame 311 are substantially the same, or may be formed at a position where the distance between the center position of the electromagnet and the frame 311 is approximately the same. Since the groove portion 313a is formed at a position where the magnetic field lines of the magnetic field formed by the electromagnet hardly pass, an increase in magnetic resistance can be suppressed and a high attractive force can be obtained. Further, since the deformation of the movable platen 313 occurs symmetrically with respect to the center position of the movable platen 313, the inclination of the movable platen 313 with respect to the frame 311 can be suppressed.

  Although the present embodiment has been described with respect to the movable platen, it can also be applied to a fixed platen and a rear platen. The fixed platen and the rear platen may have a deforming portion that deforms so as to absorb the rotational moment acting on each of them.

  As mentioned above, although embodiment of the injection molding machine was described, this invention is not limited to the said embodiment, A various deformation | transformation and improvement are possible within the range of the summary described in the claim. .

  For example, in the above embodiment, the fixed platen support portion is fixed to the frame, and the rear platen support portion is movably mounted on the frame. However, the fixed platen support portion is movably mounted on the frame, and the rear platen support portion is It may be fixed to the frame. It is only necessary to allow the tie bar to grow in accordance with the clamping force.

  The mold clamping device of the above embodiment is a three-platen type, but may be a two-platen type, and may have a fixed platen and a movable platen, and may not have a rear platen. The mold clamping device may be a tie barless type.

  Further, in the movable platen support portion 343 shown in FIG. 5, between the movable platen 313 and the first arm portion (first connecting portion) 343b, and between the movable platen 313 and the second arm portion (second connecting portion) 343c. A guide may be provided between at least one of the first arm portion 343b and the column portion 343a and between the second arm portion 343c and the column portion 343a. For example, a guide provided on one of the movable platen 313 and the column portion 343a may be in contact with either one of the first arm portion 343b and the second arm portion 343c so as to be relatively movable. Absorbs rotational moment. In this case, the movable platen 313 may or may not have the groove 313a. The same applies to the fixed platen support and the rear platen support.

10 Mold Clamping Device 11 Frame 12 Fixed Platen 13 Movable Platen 15 Rear Platen (Clamping Member)
16 Tie bar (connecting member)
30 Mold device 32 Fixed mold 33 Movable mold 42 Fixed platen support portion 42b First connection portion 42c Second connection portion 43 Movable platen support portion 43a First connection portion 43b Second connection portion 45 Rear platen support portion (for mold clamping) Member support)
45a 1st connection part 45b 2nd connection part 143 Movable platen support part 151 1st connection part 152 2nd connection part 313 Movable platen 313a Groove part (deformation part)

Claims (15)

A platen to which the mold is attached;
A platen support part for supporting the platen at a plurality of positions at different distances from the frame,
The platen support part is an injection molding machine that suppresses transmission of a rotational moment from the platen. A platen to which the mold is attached;
A platen support part for supporting the platen at a plurality of positions at different distances from the frame,
The platen support part is an injection molding machine having a deforming part that is deformed so as to absorb a rotational moment acting on the platen.   3. The injection molding machine according to claim 1, wherein the platen support portion has a connection portion whose one end is rotatably connected to the platen.   The injection molding machine according to claim 3, wherein the platen support section includes a plurality of the connection sections, and one end portions of the plurality of connection sections are connected to the platen at different positions from the frame.   The injection molding machine according to claim 4, wherein the other end portions of the plurality of connection portions are relatively movable. The platen support part has a plurality of connecting parts in which each one end part is connected to the platen at a position where the distance from the frame is different.
The injection molding machine according to claim 1 or 2, wherein the other end portions of the plurality of connecting portions are relatively movable.   The injection molding machine according to claim 6, wherein one end of at least one of the connecting portions is rotatably connected to the platen. A mold clamping member connected via a connecting member to a platen to which a mold is attached;
An injection molding machine comprising: a mold clamping member support portion that supports the mold clamping member at a plurality of positions at different distances from the frame.   The injection molding machine according to claim 8, wherein the mold clamping member support portion suppresses transmission of a rotational moment from the mold clamping member.   10. The injection molding machine according to claim 9, wherein the mold clamping member support portion has a connection portion whose one end is rotatably connected to the mold clamping member.   The mold clamping member support section includes a plurality of the connection sections, and one end portions of the plurality of connection sections are connected to the mold clamping member at positions at different distances from the frame. The injection molding machine described.   The injection molding machine according to claim 11, wherein the other end portions of the plurality of connection portions are relatively movable. The mold clamping member support portion has a plurality of coupling portions each of which is coupled to the mold clamping member at positions where the distance from the frame is different from the one end portion.
The injection molding machine according to claim 9, wherein the other end portions of the plurality of connecting portions are relatively movable.   The injection molding machine according to claim 13, wherein one end portion of at least one of the connecting portions is rotatably connected to the mold clamping member.   The injection molding machine according to any one of claims 8 to 14, wherein the mold clamping member has a deforming portion that is deformed so as to absorb a rotational moment acting on the mold clamping member.

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