CN107225727B

CN107225727B - Injection molding machine

Info

Publication number: CN107225727B
Application number: CN201710177702.0A
Authority: CN
Inventors: 森谷知宽
Original assignee: Sumitomo Heavy Industries Ltd
Current assignee: Sumitomo Heavy Industries Ltd
Priority date: 2016-03-25
Filing date: 2017-03-23
Publication date: 2020-05-05
Anticipated expiration: 2037-03-23
Also published as: JP6727875B2; CN107225727A; JP2017170857A

Abstract

The invention provides an injection molding machine, which can inhibit the deformation transmission caused by a mold clamping force and inhibit the transmission efficiency reduction of the mold clamping force to a mold device. In an injection molding machine having a fixed platen, the fixed platen has a mold mounting portion on which a mold is mounted, a spacer portion disposed at an interval from the mold mounting portion in a mold opening and closing direction, and a connecting portion connecting the mold mounting portion and the spacer portion, the spacer portion includes a load receiving portion that receives a load from a connecting rod at a corner portion when the mold is clamped, the connecting portion forms a recessed portion between the mold mounting portion and the spacer portion at a periphery of the corner portion, the recessed portion forms a space for allowing deformation of the spacer portion caused by clamping, and the fixed platen further has a deformation suppressing portion that suppresses deformation of the spacer portion caused by clamping.

Description

Injection molding machine

The present application claims priority based on japanese patent application No. 2016-. The entire contents of this application are incorporated by reference into this specification.

Technical Field

The present invention relates to an injection molding machine.

Background

The fixed platen of the injection molding machine described in patent document 1 includes a mold mounting portion, a tie bar supporting portion, and a load transmission portion. The mold mounting portion has a mold mounting surface. The connecting rod supporting part is provided with connecting rod inserting parts at four corners, and connecting rod inserting holes are dug in each connecting rod inserting part. The load transmission part connects the die mounting part and the connecting rod supporting part which are arranged in a separated space.

Patent document 1: japanese laid-open patent publication No. 2015-150693

It is being studied to form a space for allowing deformation caused by the mold clamping force in a member mounting the tie bar.

However, the loss of force due to deformation is large, and the transmission efficiency of the mold clamping force to the mold device is low.

Disclosure of Invention

The present invention has been made in view of the above problems, and a main object thereof is to provide an injection molding machine capable of suppressing transmission of deformation due to a mold clamping force and suppressing a decrease in efficiency of transmission of the mold clamping force to a mold device.

In order to solve the above problem, according to an aspect of the present invention, there is provided an injection molding machine comprising:

in an injection molding machine having a fixed platen,

the fixed platen has a mold mounting portion for mounting a mold, a spacer portion disposed at an interval from the mold mounting portion in a mold opening/closing direction, and a connecting portion for connecting the mold mounting portion and the spacer portion,

the spacer includes a load receiving portion for receiving a load from the tie bar at the corner portion during mold clamping,

the connecting portion forms a recess between the die mounting portion and the spacer portion at the periphery of the corner portion,

the recess forms a space for allowing deformation of the partition caused by mold clamping,

the fixed platen further has a deformation suppressing portion that suppresses deformation of the spacer portion caused by mold clamping.

Effects of the invention

According to an aspect of the present invention, there is provided an injection molding machine capable of suppressing transmission of deformation due to a mold clamping force and suppressing a decrease in efficiency of transmission of the mold clamping force to a mold device.

Drawings

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment.

Fig. 2 is a diagram showing a state of the injection molding machine according to an embodiment when clamping a mold.

Fig. 3 is a view of a fixed platen according to an embodiment as viewed from above.

Fig. 4 is a rear view of the fixed platen according to the embodiment.

Fig. 5 is a view of a fixed platen according to an embodiment as viewed from the front.

Fig. 6 is a view of the fixed platen according to modification 1 as viewed from above.

Fig. 7 is a view of the fixed platen according to modification 2 as viewed from above.

Fig. 8 is a view of a toggle seat according to an embodiment, as viewed from above.

Fig. 9 is a front view of a toggle seat according to an embodiment.

Fig. 10 is a rear view of a toggle seat according to an embodiment.

Description of the reference symbols

10-mold clamping device, 12-stationary platen, 121-mold mounting, 122-notched portion, 123-spacer, 124-load bearing portion, 125-link, 126-recess, 127-rib, 128-resistance generating portion, 129-reinforcement, 13-movable platen, 15-toggle seat, 151-toggle mounting, 152-notched portion, 153-spacer, 154-load bearing portion, 155-link, 156-recess, 157-rib, 30-mold device, 40-injection device, 50-ejector device.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the same or corresponding components are denoted by the same or corresponding reference numerals in the drawings, and the description thereof will be omitted. In the drawings, the X direction, the Y direction, and the Z direction are perpendicular to each other. The Z direction indicates the up-down direction, the X direction and the Y direction indicate the horizontal direction, and the X direction indicates the mold opening and closing direction.

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment. Fig. 2 is a diagram showing a state of the injection molding machine according to an embodiment when clamping a mold. As shown in fig. 1 and 2, the injection molding machine includes a frame Fr, a mold clamping device 10, an injection device 40, an ejector device 50, and a control device 90. In the following description, the moving direction of the movable platen 13 when the mold is closed (the right direction in fig. 1 and 2) is set to the front, and the moving direction of the movable platen 13 when the mold is opened (the left direction in fig. 1 and 2) is set to the rear.

The mold clamping device 10 closes, clamps, and opens the mold of the mold device 30. The mold clamping device 10 is a horizontal type mold clamping device in which the mold opening and closing direction is horizontal. The mold clamping device 10 includes a fixed platen 12, a movable platen 13, a toggle base 15, a tie bar 16, a toggle mechanism 20, a mold clamping motor 21, and a motion conversion mechanism 25.

The fixed platen 12 is fixed with respect to the frame Fr. A fixed mold 32 is attached to a surface of the fixed platen 12 facing the movable platen 13.

The movable platen 13 is provided to be movable along a guide device (e.g., a guide rail) 17 laid on the frame Fr and to be movable forward and backward with respect to the fixed platen 12. A movable mold 33 is attached to a surface of the movable platen 13 facing the fixed platen 12.

The movable platen 13 is advanced and retreated relative to the fixed platen 12, thereby performing mold closing, mold clamping, and mold opening. The mold device 30 is constituted by a fixed mold 32 and a movable mold 33.

The toggle seat 15 is connected to the fixed platen 12 with a gap therebetween and is placed on the frame Fr so as to be movable in the mold opening/closing direction. The toggle seat 15 may be provided to be movable along a guide device laid on the frame Fr. The guide means of the toggle seat 15 can also be common with the guide means 17 of the movable platen 13.

In the present embodiment, the fixed platen 12 is fixed to the frame Fr and the toggle seat 15 is movable in the mold opening/closing direction with respect to the frame Fr, but the toggle seat 15 may be fixed to the frame Fr and the fixed platen 12 may be movable in the mold opening/closing direction with respect to the frame Fr.

The tie bars 16 connect the fixed platen 12 and the toggle seats 15 with a gap therebetween. A plurality of (e.g., 4) connecting rods 16 may be used. Each tie bar 16 is provided parallel to the mold opening and closing direction and extends in accordance with the mold clamping force. At least 1 tie bar 16 is provided with a mold clamping force detector 18. The mold clamping force detector 18 detects the mold clamping force by detecting the strain of the tie bar 16, and transmits a signal indicating the detection result to the control device 90.

The mold clamping force detector 18 is not limited to the strain gauge type, and may be of a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the attachment position thereof is not limited to the tie bar 16.

The toggle mechanism 20 moves the movable platen 13 relative to the fixed platen 12. The toggle mechanism 20 is disposed between the movable platen 13 and the toggle base 15. The toggle mechanism 20 includes a crosshead 20a, a pair of links, and the like. Each link group includes a plurality of

links

20b and 20c telescopically coupled by a pin or the like. One link 20b is swingably attached to the movable platen 13, and the other link 20c is swingably attached to the toggle seat 15. When the crosshead 20a is advanced and retreated, the plurality of

links

20b and 20c extend and contract, and the movable platen 13 is advanced and retreated with respect to the toggle seat 15.

The mold clamping motor 21 is attached to the toggle seat 15 and operates the toggle mechanism 20. The mold clamping motor 21 advances and retracts the movable platen 13 by extending and retracting the

links

20b and 20c by advancing and retracting the crosshead 20 a.

The motion conversion mechanism 25 converts the rotational motion of the mold clamping motor 21 into a linear motion and transmits the linear motion to the crosshead 20 a. The motion conversion mechanism 25 is constituted by, for example, a ball screw mechanism.

The operation of the mold clamping device 10 is controlled by a control device 90. As shown in fig. 1 or 2, the control device 90 includes a cpu (central Processing unit)91, a storage medium 92 such as a memory, an input interface 93, and an output interface 94. The control device 90 performs various controls by causing the CPU91 to execute programs stored in the storage medium 92. The control device 90 receives a signal from the outside through the input interface 93 and transmits a signal to the outside through the output interface 94. The controller 90 controls the mold closing process, mold opening process, and the like.

In the mold closing step, the mold clamping motor 21 is driven to advance the crosshead 20a to the mold closing end position at a set speed, thereby advancing the movable platen 13 and bringing the movable mold 33 into contact with the fixed mold 32. The position and speed of the crosshead 20a are detected using, for example, an encoder 21a of the mold clamping motor 21. The encoder 21a detects the rotation of the mold clamping motor 21, and transmits a signal indicating the detection result to the control device 90.

In the mold clamping step, the mold clamping motor 21 is further driven to further advance the crosshead 20a from the mold closing end position to the mold clamping position, thereby generating a mold clamping force. During mold clamping, a cavity space 34 is formed between the movable mold 33 and the fixed mold 32, and the injection device 40 fills the cavity space 34 with a liquid molding material. The filled molding material is hardened to obtain a molded article. The number of the cavity spaces 34 may be plural, and in this case, plural molded articles can be obtained at the same time.

In the mold opening step, the crosshead 20a is moved back to the mold opening completion position at a set speed by driving the mold closing motor 21, whereby the movable platen 13 is moved back and the movable mold 33 is separated from the fixed mold 32. Then, the ejector 50 ejects the molded product from the movable mold 33.

Fig. 3 is a view of a fixed platen according to an embodiment as viewed from above. In fig. 3, the direction of the arrow indicates the direction of the force acting on the fixed platen 12 during mold clamping. In fig. 3, the deformation of the spacer 123 during mold clamping is exaggerated by a two-dot chain line. Fig. 4 is a rear view of the fixed platen according to the embodiment. Fig. 5 is a view of a fixed platen according to an embodiment as viewed from the front.

The fixed platen 12 includes a mold mounting portion 121 to which the fixed mold 32 is mounted, a spacer portion 123 disposed at a distance from the mold mounting portion 121 in the mold opening/closing direction, and a coupling portion 125 coupling the mold mounting portion 121 and the spacer portion 123. A nozzle insertion hole 12a into which a nozzle of the injection device 40 is inserted is formed in the center of the fixed platen 12. A tie bar insertion hole 12b through which the tie bar 16 is inserted is formed in a corner portion of the fixed platen 12. The mold attachment portion 121, the spacer portion 123, and the coupling portion 125 may be integrally molded by casting or the like.

The mold mounting portion 121 has a mold mounting surface on an opposing surface opposing the movable platen 13. A fixed die 32 is attached to the die attachment surface. The shape of the die attachment portion 121 is not particularly limited, and is, for example, a substantially rectangular plate shape. A notch 122 is formed at a corner of the mold attachment portion 121 to avoid the tie bar 16. The plurality of notch portions 122 are provided corresponding to the plurality of tie bars 16. In addition, instead of the notch portion 122, a hole may be formed.

The spacer 123 is disposed on the side opposite to the movable platen 13 (for example, in front of the mold mounting portion 121) with respect to the mold mounting portion 121. The shape of the spacer 123 is not particularly limited, and is, for example, a substantially rectangular plate shape. A load receiving portion 124 that receives a load from the tie bar 16 during mold clamping is formed at a corner of the spacer portion 123. The load receiving portions 124 are formed at 4 corners of the isolation portion 123. Each load receiving portion 124 is formed with a connecting rod insertion hole 12 b.

As shown in fig. 3, a screw shaft 161 is formed at the distal end of the connecting rod 16, and a screw nut 162 is screwed to the screw shaft 161. The connecting rod 16 is fixed to a rib 127 described later by tightening the screw nut 162.

The connecting portion 125 connects the die mounting portion 121 and the spacer 123 with a gap therebetween in the die opening and closing direction. The connecting portion 125 is, for example, cylindrical, and connects the center of the die mounting portion 121 and the center of the spacer 123 with a gap therebetween in the die opening/closing direction.

In fig. 4, the connecting portion 125 has a cylindrical shape, but may have a prismatic shape, a cross-columnar shape, or the like. In fig. 4, the connection portion 125 is provided at the central portion of the fixed platen 12, but may be provided at two locations of the central portion and the outer peripheral portion with a gap therebetween, or may be provided so as to extend from the central portion to the outer peripheral portion. In fig. 4, the number of the coupling portions 125 is 1, but a plurality thereof may be provided.

The coupling portion 125 forms a recess 126 (refer to fig. 3) between the die mounting portion 121 and the spacer 123 at the periphery of the corner of the spacer 123. The recess 126 is formed around 4 corners of the partition 123, but may be formed around at least 1 corner of the partition 123.

The recess 126 forms a space for allowing deformation of the spacer 123 caused by mold clamping. This can suppress the deformation of the spacer 123 due to mold clamping from being transmitted to the mold mounting portion 121, and can suppress the bending deformation of the fixed mold 32.

However, since the coupling portion 125 is not present at the portion where the recess 126 is formed, the deformation of the spacer 123 cannot be suppressed by the coupling portion 125.

The fixed platen 12 further includes a deformation suppressing portion for suppressing deformation of the spacer 123 caused by mold clamping. The deformation suppressing portion includes, for example, a rib 127 protruding from the spacer portion 123 to the side (e.g., the front side) opposite to the mold mounting portion 121. The rib 127 may be formed integrally with the partition 123 by casting or the like.

The rib 127 suppresses deformation of the spacer 123 due to mold clamping. This reduces the loss of force due to the deformation of the spacer 123, and improves the efficiency of transmitting the clamping force to the mold device 30. Further, since the rib 127 is provided only in a part of the front surface of the partition 123, the weight of the fixed platen 12 can be suppressed.

As shown in fig. 5, the rib 127 includes, for example, an annular portion 127a provided at the center of the spacer 123, a radial portion 127b provided so as to extend from the center to the corner of the spacer 123, and a linear portion 127c linearly formed so as to connect the corners of the spacer 123 to each other. The annular portion 127a, the radial portion 127b, and the linear portion 127c may be connected.

The radial portions 127b are provided so as to span from the central portion of the partition 123 to the 4 corner portions of the partition 123. The number of arm portions of the radial portion 127b extending from the center of the spacer 123 to the corner of the spacer 123 is not limited to 4.

The linear portion 127c is formed linearly so as to connect the corner portions of the partition 123 along the outer periphery of the partition 123. The number of the linear portions 127c is, for example, 4. The number of the linear portions 127c is not limited to 4.

The rib 127 includes two types, i.e., a radial portion 127b and a linear portion 127c, but may include only one type. The rib 127 may not have the annular portion 127 a.

Fig. 6 is a view of the fixed platen according to modification 1 as viewed from above. In fig. 6, the arrow direction indicates the direction of the force acting on the fixed platen 12A during mold clamping. In fig. 6, the deformation of the spacer 123 during mold clamping is exaggerated by a two-dot chain line. The fixed platen 12A includes a mold attachment portion 121, a spacer portion 123, a coupling portion 125, and a resistance generation portion 128 as a deformation suppression portion.

The resistance generating portion 128 has both

end portions

128a and 128b fixed to the spacer portion 123 and has an intermediate portion between the both

end portions

128a and 128b not fixed to the spacer portion 123, and generates resistance against deformation of the spacer portion 123 due to mold clamping.

The intermediate portion is constituted by, for example, a rod 128 c. The rod 128c is fixed to both

end portions

128a, 128b of the resistance generating portion 128 via nuts 128d, 128e screwed to the rod 128 c. The rod 128c generates resistance against deformation of the spacer 123 due to mold clamping by the elastic restoring force, thereby suppressing deformation of the spacer 123 due to mold clamping.

In fig. 6, the both

end portions

128a and 128b of the resistance generating portion 128 are provided on the surface of the spacer portion 123 opposite to the mold mounting portion 121 (for example, the front surface of the spacer portion 123), but may be provided on the side surface of the spacer portion 123 (for example, the Y-direction end surface or the Z-direction end surface) and protrude to the side opposite to the mold mounting portion 121.

The resistance generating portion 128 suppresses deformation of the spacer portion 123 caused by mold clamping. This reduces the loss of force due to the deformation of the spacer 123, and improves the efficiency of transmitting the clamping force to the mold device 30. Further, since the resistance generating portion 128 is provided only in a part of the front surface of the partition portion 123, the weight of the fixed platen 12A can be suppressed.

However, the rod 128c is stretched in the axial direction due to the deformation of the spacer 123 caused by mold clamping. In this case, before mold clamping, a compressive stress may be applied to the rod 128c in advance so as not to apply an excessive tensile stress to the rod 128 c. This can prevent the rod 128c from being broken by tensile stress. The compressive stress applied in advance to the rod 128c can be adjusted by the tightening force of the nuts 128d, 128 e.

As shown in fig. 6, the resistance generating portions 128 may be linearly provided so as to connect corner portions of the partition portion 123 to each other along the outer circumference of the partition portion 123. The number of the rods 128c is, for example, 4. The number of the rods 128c is not limited to 4.

In the present modification, the rod 128c is linearly provided so as to connect the corner portions of the spacer 123 to each other, but may be provided in a radial shape extending from the central portion of the spacer 123 to the corner portions of the spacer 123, or may be provided in both shapes.

When the rod 128c is provided in a radial shape, a ring portion 127a shown in fig. 5 may be provided at the center of the spacer 123, and one end of the rod 128c may be fixed to the ring portion 127 a. In this way, both the resistance generating portion 128 and the rib 127 shown in fig. 3 to 5 can be used at the same time.

Instead of or in addition to the lever 128c, a spring may be used, and the structure of the intermediate portion of the resistance generating portion 128 is not particularly limited.

Fig. 7 is a view of the fixed platen according to modification 2 as viewed from above. In fig. 7, the direction of the arrow indicates the direction of the force acting on the fixed platen 12B during mold clamping. In fig. 7, the deformation of the spacer 123 during mold clamping is exaggerated by a two-dot chain line. The fixed platen 12B includes a die attachment portion 121, a spacer portion 123, a coupling portion 125, and a reinforcement portion 129 serving as a deformation suppressing portion.

The reinforcing portion 129 is formed of a material having a higher young's modulus than the isolation portion 123. The reinforcing portion 129 is formed of a material different from that of the spacer 123, and is fixed to the spacer 123 by bolts, welding, or the like.

The reinforcement portion 129 suppresses deformation of the spacer portion 123 caused by mold clamping. This reduces the loss of force due to the deformation of the spacer 123, and improves the efficiency of transmitting the clamping force to the mold device 30. Further, since the reinforcing portion 129 is formed of a material having a higher young's modulus than that of the spacer portion 123, the thickness can be reduced as compared with the case where the reinforcing portion is formed of the same material as that of the spacer portion 123, and the weight of the fixed platen 12B can be suppressed.

The reinforcing portion 129 is formed in a plate shape, for example, but may be provided in a radial shape extending from the center of the partition portion 123 to the corner portion of the partition portion 123, or may be provided linearly so as to connect the corner portions of the partition portion 123, similarly to the rib portion 127.

The reinforcing portion 129 may be used together with the rib 127, or may be fixed to the rib 127 by bolts, welding, or the like. The deformation suppressing portion may be formed by a combination of a plurality of the rib portion 127, the resistance generating portion 128, and the reinforcing portion 129.

Fig. 8 is a view of a toggle seat according to an embodiment, as viewed from above. In fig. 8, the arrow direction indicates the direction of the force acting on the toggle seat 15 during mold clamping. In fig. 8, the deformation of the spacer 153 during mold clamping is exaggerated by a two-dot chain line. Fig. 9 is a front view of a toggle seat according to an embodiment. Fig. 10 is a rear view of a toggle seat according to an embodiment.

The toggle holder 15 includes a toggle mounting portion 151 to which the toggle mechanism 20 is mounted, a spacer portion 153 arranged at an interval from the toggle mounting portion 151 in the mold opening and closing direction, and a connecting portion 155 connecting the toggle mounting portion 151 and the spacer portion 153. A ball screw shaft insertion hole 15a through which the ball screw shaft of the motion conversion mechanism 25 is inserted is formed in the center of the toggle seat 15. A link insertion hole 15b through which the link 16 is inserted is formed in a corner of the toggle seat 15. The toggle attachment portion 151, the spacer portion 153, and the connecting portion 155 may be integrally molded by casting or the like.

The toggle mounting portion 151 is a component to which the toggle mechanism 20 is mounted. The toggle attachment portion 151 includes, for example, a substantially rectangular plate-like portion 151a, and a link pin attachment portion 151b protruding forward from a surface of the plate-like portion 151a facing the movable platen 13. The link pin 20d of the toggle mechanism 20 is attached to the link pin attachment portion 151 b. A notch portion 152 for avoiding the tie bar 16 is formed at a corner portion of the plate-shaped portion 151 a. A plurality of notch portions 152 are provided corresponding to the plurality of tie bars 16. In addition, holes may be formed instead of the notch portions 152. The toggle mounting portion 151 is not coupled to the connecting rod 16.

The spacer 153 is disposed on the side opposite to the movable platen 13 with reference to the toggle mounting portion 151 (for example, behind the toggle mounting portion 151). A load receiving portion 154 that receives a load from the tie bar 16 during clamping is formed at a corner of the spacer 153. The load receiving portions 154 are formed at 4 corners of the partition 153. Each load receiving portion 154 is formed with a connecting rod insertion hole 15 b.

As shown in fig. 8, a screw shaft 163 is formed at the rear end portion of the connecting rod 16, and a screw nut 164 is screwed to the screw shaft 163. The connection rod 16 is fixed to a rib 157 described later via a screw nut 164.

The connecting portion 155 connects the toggle mounting portion 151 and the spacer 153 with a gap therebetween in the mold opening and closing direction. The connecting portion 155 is, for example, cylindrical, and connects the center portion of the toggle mounting portion 151 and the center portion of the spacer 153 with a gap therebetween in the mold opening and closing direction.

In fig. 9, the connection portion 155 has a cylindrical shape, but may have a prismatic shape, a cross-columnar shape, or the like. In fig. 9, the connection portion 155 is provided at the central portion of the toggle seat 15, but may be provided at two locations of the central portion and the outer peripheral portion with a gap therebetween, or may be provided so as to extend from the central portion to the outer peripheral portion. In fig. 9, the number of the connection portions 155 is 1, but a plurality thereof may be provided.

The coupling portion 155 forms a recess 156 (refer to fig. 8) between the toggle mounting portion 151 and the spacer 153 at the periphery of the corner of the spacer 153. The concave portions 156 are formed around 4 corners of the partition 153, but may be formed around at least 1 corner of the partition 153.

The recess 156 forms a space for allowing deformation of the spacer 153 caused by mold clamping. This can suppress the deformation of the spacer 153 due to mold clamping from being transmitted to the toggle mounting portion 151 and the toggle mechanism 20.

However, since the coupling portion 155 is not present at the portion where the recess 156 is formed, the deformation of the spacer 153 cannot be suppressed by the coupling portion 155.

The toggle seat 15 further includes a deformation suppressing portion for suppressing deformation of the spacer 153 due to mold clamping. The deformation inhibiting portion includes, for example, a rib 157 that protrudes from the spacer 153 to the side (e.g., the rear side) opposite to the toggle mounting portion 151. The rib 157 may be formed integrally with the partition 153 by casting or the like.

The rib 157 suppresses deformation of the spacer 153 due to mold clamping. This reduces the loss of force due to the deformation of the spacer 153, and improves the efficiency of transmitting the clamping force to the mold device 30. Further, since the rib 157 is provided only in a part of the rear surface of the spacer 153, the weight of the toggle seat 15 can be suppressed.

For example, as shown in fig. 10, the rib 157 includes an annular portion 157a provided at the center of the partition 153, a radial portion 157b provided so as to extend from the center to the corner of the partition 153, and a linear portion 157c linearly formed so as to connect the corners of the partition 153 to each other. The annular portion 157a, the radial portion 157b, and the linear portion 157c may be connected.

The radial portion 157b is provided so as to extend from the central portion of the partition 153 to 4 corner portions of the partition 153. The number of arm portions of the radial portion 157b extending from the center of the partition 153 to the corner of the partition 153 is not limited to 4.

The linear portions 157c are formed linearly so as to connect the corner portions of the partition 153 along the outer periphery of the partition 153. The number of the linear portions 157c is, for example, 4. The number of the linear portions 157c is not limited to 4.

The rib 157 has two types, i.e., a radial portion 157b and a linear portion 157c, but may have only one type. The rib 157 may not have the annular portion 157 a.

The toggle seat 15 shown in fig. 8 to 10 has the rib 157 in the same manner as the fixed platen 12 shown in fig. 3 to 5, but may have a resistance generating portion in the same manner as the fixed platen 12A shown in fig. 6, or may have a reinforcing portion in the same manner as the fixed platen 12B shown in fig. 7. The deformation suppressing portion may be formed by a combination of a plurality of the rib 157, the resistance generating portion, and the reinforcing portion.

While the embodiment of the injection molding machine and the like have been described above, the present invention is not limited to the above embodiment and the like, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims.

In the above embodiment, a horizontal mold clamping device in which the mold opening and closing direction is the horizontal direction is used as the mold clamping device 10, but a vertical mold clamping device in which the mold opening and closing direction is the vertical direction may be used. The vertical mold closing device comprises a lower pressure plate, an upper pressure plate, a toggle seat, a toggle mechanism, a connecting rod and the like. Either one of the lower platen and the upper platen is used as a fixed platen, and the other one is used as a movable platen. The lower die is arranged on the lower pressing plate, and the upper die is arranged on the upper pressing plate. The lower die and the upper die form a die device. The lower mold may also be mounted on the lower platen via a turntable. The toggle seat is arranged below the lower pressure plate. The toggle mechanism is arranged between the toggle seat and the lower pressing plate. The connecting rod is parallel to the vertical direction and penetrates through the lower pressing plate to connect the upper pressing plate and the toggle seat. The upper platen, the lower platen, the toggle seat, and the like may be substantially triangular in shape when viewed in the vertical direction, and a connecting rod may be disposed at each corner of the triangle.

Claims

1. An injection molding machine having a toggle seat, wherein,

the toggle seat has a toggle mounting portion for mounting a toggle mechanism, a spacer portion disposed at an interval from the toggle mounting portion in a mold opening/closing direction, and a connecting portion for connecting the toggle mounting portion and the spacer portion,

the linking portion forms a recess between the toggle mounting portion and the spacer portion at the periphery of the corner portion,

the toggle seat further has a deformation suppressing portion that suppresses deformation of the spacer portion caused by mold clamping.

2. The injection molding machine according to claim 1,

the deformation inhibiting portion is provided in a radial shape spanning from a central portion of the partition portion to the corner portion of the partition portion.

3. The injection molding machine according to claim 1 or 2,

the deformation suppressing portion is provided linearly so as to connect the corner portions of the partition portion to each other.

4. The injection molding machine according to claim 1 or 2,

the deformation inhibiting portion includes a rib portion protruding from the spacer portion to a side opposite to the mold mounting portion.

5. The injection molding machine according to claim 1 or 2,

the deformation inhibiting portion includes a resistance generating portion having both end portions fixed to the spacer portion and an intermediate portion between the both end portions not fixed to the spacer portion, and generating resistance against the deformation.

6. The injection molding machine according to claim 1 or 2,

the deformation inhibiting portion includes a reinforcing portion formed of a material having a higher Young's modulus than the spacer portion.