TWI631003B - Injection molding machine - Google Patents

Abstract

The present invention provides an injection molding machine capable of suppressing the clamping force from deviating to one side. An injection molding machine (10) according to the present invention includes pressure plates (12, 13) to which molds (32, 33) are mounted. The pressure plate (13) includes a movable platen body (41) to which a mold (33) is mounted, and support portions (42L, 42R) that support the movable platen body (41). The support portions (42L, 42R) include portions that transmit the force from the movable platen body (41) diagonally downward.

Description

Injection molding machine

The present invention relates to an injection molding machine.

An injection molding machine manufactures a molded product by filling and curing a molten resin in a cavity space of a mold device (for example, refer to Patent Document 1). The mold device is composed of a fixed mold and a movable mold. The fixed mold is installed on a fixed platen, and the movable mold is installed on a movable platen. The movable platen is in contact with and separated from the fixed platen, thereby closing, closing, and opening the mold. When the mold is closed, a cavity space is formed between the fixed mold and the movable mold.

(Prior technical literature) (Patent Literature)

Patent Document 1: Japanese Patent Application Laid-Open No. 2009-101529

Among the members constituting the mold clamping device of the injection molding machine, members such as a fixed platen and a movable platen are composed of a main body and a supporting portion that supports the main body. The support portion has a substantially inverted L shape, and includes a horizontal portion extending horizontally from the main body and a vertical portion extending downward from a front end of the horizontal portion.

The force applied from the main body to the horizontal portion is perpendicular to the extending direction of the horizontal portion and generates a moment at the support portion. Therefore, the support portion is greatly deflected, the centerline of the main body is largely deviated from the up and down direction, and the clamping force may be deviated to one side.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an injection molding machine capable of suppressing the clamping force from deviating to one side.

In order to solve the above-mentioned problem, a bear-like injection molding machine of the present invention is provided with a platen on which a mold is mounted, the platen includes a platen body on which the mold is mounted, and a support portion that supports the platen body, the support portion includes an oblique downward direction Part of transmitting the force from the main body of the aforementioned platen.

According to the present invention, there is provided an injection molding machine capable of suppressing the clamping force from being biased to one side.

10‧‧‧ Injection molding machine

11‧‧‧ Rack

12‧‧‧ fixed platen

13‧‧‧ movable platen

14L, 14R‧‧‧Slider

15‧‧‧ rear platen

16‧‧‧ Tie

17L, 17R‧‧‧Guide

30‧‧‧Mould device

32‧‧‧ fixed mold

33‧‧‧Motion

41‧‧‧ movable platen body

42L, 42R‧‧‧ support

43L, 43R‧‧‧arm

44L, 44R‧‧‧Column

51‧‧‧Fixed platen body

52L, 52R‧‧‧Support

53L, 53R‧‧‧arm

54L, 54R‧‧‧Column

61‧‧‧ rear platen body

62L, 62R‧‧‧body support

63L, 63R‧‧‧arm

64L, 64R‧‧‧Column

110‧‧‧ injection molding machine

111‧‧‧ Rack

115‧‧‧ rear platen

118‧‧‧Adsorption Plate

134‧‧‧Electromagnet

135‧‧‧Adsorption Department

161‧‧‧ rear platen body

162L, 162R‧‧‧ body support

163L, 163R‧‧‧arm

164L, 164R‧‧‧Column

171‧‧‧Adsorption plate body

172L, 172R‧‧‧ body support

173L, 173R‧‧‧arm

174L, 174R‧‧‧Column

Fig. 1 is a view showing a state when the injection molding machine according to the first embodiment of the present invention has completed mold closing.

Fig. 2 is a diagram showing an injection molding machine according to a first embodiment of the present invention; Picture of the state when the mold is completed.

Fig. 3 is a cross-sectional view taken along the line III-III of Fig. 1 and is a cross-sectional view of the movable platen.

Fig. 4 is a cross-sectional view taken along the line IV-IV of Fig. 1, and is a cross-sectional view of the fixed platen.

Fig. 5 is a cross-sectional view taken along the line V-V of Fig. 1 and a cross-sectional view of the rear pressure plate.

FIG. 6 is an explanatory diagram of the force applied to the supporting portion from the movable platen main body shown in FIG. 3. FIG.

Fig. 7 is a cross-sectional view showing a state when the injection molding machine according to the second embodiment of the present invention has completed mold closing.

Fig. 8 is a cross-sectional view showing the state of the injection molding machine according to the second embodiment of the present invention when the mold is opened.

Fig. 9 is a cross-sectional view taken along the line IX-IX in Fig. 7 and a cross-sectional view of the rear pressure plate.

Fig. 10 is a sectional view taken along line X-X in Fig. 7 and is a sectional view of the adsorption plate.

FIG. 11 is a diagram showing a modification of FIG. 3.

Hereinafter, the embodiments for implementing the present invention will be described with reference to the drawings. In each drawing, the same or corresponding components are given the same or corresponding component symbols, and the description is omitted. In addition, the moving direction of the movable platen when the mold is closed is set to be forward, and the movement of the movable platen when the mold is opened is set. The moving direction will be described below. In addition, the vertical direction with respect to a rack is demonstrated as an up-down direction. The front-back direction, the up-down direction, and the left-right direction are mutually perpendicular directions.

[First Embodiment]

Fig. 1 is a view showing a state when the injection molding machine according to the first embodiment of the present invention has completed mold closing. Fig. 2 is a diagram showing a state when the injection molding machine according to the first embodiment of the present invention has completed the mold opening. Fig. 3 is a cross-sectional view taken along the line III-III of Fig. 1 and is a cross-sectional view of the movable platen. Fig. 4 is a cross-sectional view taken along the line IV-IV of Fig. 1, and is a cross-sectional view of the fixed platen. Fig. 5 is a cross-sectional view taken along the line V-V of Fig. 1 and a cross-sectional view of the rear pressure plate.

As shown in FIGS. 1 and 2, the injection molding machine 10 includes a frame 11, a fixed platen 12 fixed to the frame 11, and a platen 15 that is disposed at a distance from the fixed platen 12. The fixed platen 12 and the rear platen 15 are connected by a plurality of (for example, four) tie bars 16. The axial direction of the tie rod 16 becomes the front-back direction. Since the tie rod 16 is allowed to extend during mold clamping, the rear platen 15 is placed so as to be able to advance and retract relative to the frame 11.

The injection molding machine 10 further includes a movable platen 13 disposed between the fixed platen 12 and the rear platen 15. As shown in FIG. 3 and the like, the movable platen 13 is fixed to the left and right pair of sliders 14L and 14R, and the sliders 14L and 14R move freely forward and backward along the guides 17L and 17R laid on the frame 11. Thereby, the movable platen 13 is freely brought into contact with and separated from the fixed platen 12. The movable pressure plate 13 has a notch at a position corresponding to the tie bar 16.

In addition, although the movable platen 13 of this embodiment has a notch at a position corresponding to each tie bar 16, it may have a through hole instead of the notch.

The movable mold 33 is mounted on the surface of the movable platen 13 that faces the fixed platen 12, and the fixed mold 32 is mounted on the surface of the fixed platen 12 that faces the movable platen 13. The mold device 30 includes a fixed mold 32 and a movable mold 33. When the movable platen 13 is advanced, the movable mold 33 contacts the fixed mold 32 to close the mold. When the movable platen 13 is retracted, the movable mold 33 is separated from the fixed mold 32 and the mold is opened.

The injection molding machine 10 further includes a toggle mechanism 20 disposed between the movable platen 13 and the rear platen 15 and a mold clamping motor 26 that operates the toggle mechanism 20. The mold clamping motor 26 includes a ball screw mechanism as a motion conversion unit that converts a rotary motion into a linear motion, and advances and retreats the drive shaft 25 to operate the toggle mechanism 20.

The toggle mechanism 20 includes, for example, a cross head 24 that can move forward and backward in a direction parallel to the mold opening and closing direction; a second toggle lever 23 that is swingably mounted on the cross head 24; a first toggle lever 21 that is swingably mounted on the rear The pressure plate 15 and the elbow arm 22 are swingably mounted on the movable platen 13. The first toggle lever 21 and the second toggle lever 23, and the first toggle lever 21 and the toggle arm 22 are respectively pin-coupled. The toggle mechanism 20 is a so-called in-rolled 5-point double toggle mechanism.

The mold clamping device includes a fixed platen 12, a movable platen 13, a rear platen 15, a toggle mechanism 20, a mold clamping motor 26, and the like.

Next, referring to FIG. 1 and FIG. 2, The operation of the injection molding machine 10 will be described.

When the mold opening is completed (the state in FIG. 2), the mold clamping motor 26 is driven in the forward direction to advance the crosshead 24 as a driven member, thereby operating the toggle mechanism 20. In this way, the movable platen 13 advances, and as shown in FIG. 1, the movable mold 33 contacts the fixed mold 32 to complete the mold closing.

Next, when the mold clamping motor 26 is further driven in the positive direction, the toggle mechanism 20 generates a mold clamping force multiplied by the thrust generated by the mold clamping motor 26 by the toggle ratio. The mold clamping is performed by the clamping force. In addition, a cavity space (not shown) is formed between the fixed mold 32 and the movable mold 33 in the mold clamping state. The injection cylinder fills the cavity space with the molten resin, and the filled molten resin is solidified to become a molded product.

Next, the mold clamping motor 26 is driven in the reverse direction to move the crosshead 24 backward, so that the toggle mechanism 20 is operated, whereby the movable platen 13 is retracted to perform mold opening. Thereafter, the ejection device ejects the molded product from the movable mold 33.

In addition, the mold clamping device of this embodiment uses the toggle mechanism 20 to generate the mold clamping force, but the thrust generated by the mold clamping motor 26 can be directly transmitted to the movable platen 13 as the mold clamping force without using the toggle mechanism 20. In addition, the thrust generated by the mold clamping cylinder may be directly transmitted to the movable platen 13 as the mold clamping force. In addition, a linear motor may be used to open and close the mold and an electromagnet may be used to perform mold clamping, and the manner of the mold clamping device is not limited.

Next, referring to FIGS. 1 and 3 for the movable platen 13 The structure is explained.

The movable platen 13 is supported by the frame 11 via sliders 14L, 14R, guides 17L, 17R, and the like. The movable platen 13 includes a movable platen body 41 to which the movable mold 33 is mounted, and support portions 42L and 42R that support the movable platen body 41. The movable platen body 41 and the support portions 42L and 42R may be integrally formed, or may be formed separately and fixed with bolts or the like. As a fixing method, welding can also be used.

The movable platen body 41 has a mold mounting surface on which the movable mold 33 is mounted. The movable mold 33 may be mounted on the movable platen body 41 so that the center line of the movable mold 33 is aligned with the center of the mold mounting surface of the movable platen body 41.

The movable platen main body 41 is provided with a toggle mounting portion 45 for mounting the toggle mechanism 20 on a surface (rear end surface) on the side opposite to the mold mounting surface. The toggle mounting portion 45 is provided with, for example, a pair of upper and lower portions, and each of the toggle arms 22 is swingably supported.

The support portions 42L and 42R are provided on the left and right sides with the movable platen body 41 interposed therebetween. The support portions 42L and 42R support a central portion in the vertical direction of the side surface of the movable platen body 41. That is, the support portions 42L and 42R support the side surfaces of the movable platen body 41 at positions substantially the same distance from the center position of the frame 11 and the mold mounting surface of the movable platen body 41.

The support portions 42L and 42R support the center portion of the side surface of the movable platen body 41 in the vertical direction, thereby separating the movable platen body 41 from the frame 11. The support portions 42L and 42R are connected to the side surface of the movable platen body 41 at one end portion and to the sliders 14L and 14R at the other end portion.

The temperature of the mold device 30 is adjusted to a predetermined temperature by a temperature regulator. The heat of the movable mold 33 is transferred to the frame 11 via the movable platen body 41, the support portions 42L, 42R, and the like.

In this embodiment, since the support portions 42L and 42R support the central portion of the side surface of the movable platen body 41 in the vertical direction, the temperature distribution of the movable platen body 41 is vertically symmetrical, unlike when supporting the lower surface 46 of the movable platen body 41. As a result, the movable platen body 41 is thermally deformed symmetrically up and down, and is kept perpendicular to the frame 11. As a result, the movable mold 33 and the fixed mold 32 are kept in parallel, and the clamping force is not easily deviated to one side.

Furthermore, in this embodiment, the support portions 42L, 42R do not restrict the lower surface 46 of the movable platen body 41, so the movable platen body 41 can be thermally deformed in two directions, up and down. Thereby, the centerline of the movable platen main body 41 is not easily deviated from the frame 11 up and down, and the centerline of the movable mold 33 is not easily deviated from the centerline of the fixed mold 32.

Next, referring to FIGS. 3 and 6, the force applied to the support portions 42L and 42R by the weight of the movable platen body 41 will be described. Fig. 6 is an explanatory diagram of a force applied to the supporting portion from the movable platen body.

As shown in FIG. 3, the support portions 42L and 42R have arm portions 43L and 43R extending linearly from the side of the movable platen body 41 obliquely downward, and linearly extending downward from the front ends of the arm portions 43L and 43R Column parts 44L and 44R. The left arm portion 43L and the left column portion 44L may be integrally formed, or may be formed separately and fixed with bolts or the like. Similarly, the right arm portion 43R and the right column portion 44R may be integrally formed, or may be formed separately and fixed with bolts or the like. The arms 43L, 43R pass diagonally downward The force from the movable platen body 41. The arm portions 43L and 43R have lower surfaces 45L and 45R that are continuous diagonally downward.

As shown in FIG. 6, the force F applied from the movable platen main body 41 to the arm portions 43L and 43R becomes the first force F1 in the direction in which the arm portions 43L and 43R extend (that is, facing obliquely downward) and the arm portion 43L The second force F2 whose 43R extension direction is perpendicular. Since the directions of the moments generated by the first force F1 and the second force F2 are opposite to each other, the moments generated on the support portions 42L and 42R become smaller.

As described above, the support portions 42L and 42R of this embodiment have portions that transmit the force from the movable platen body 41 obliquely downward, so that the moment generated in the support portions 42L and 42R due to the weight of the movable platen body 41 can be reduced. This makes it difficult for the support portions 42L and 42R to flex and the centerline of the movable platen body 41 to be prevented from being easily shifted up and down, so that the clamping force is biased to one side.

In addition, the support portions 42L and 42R of the present embodiment support the side surface of the movable platen body 41, but may support the surface of the movable platen body 41 on the side opposite to the mold mounting surface. As long as the support portions 42L and 42R have a portion that transmits the force from the movable platen body 41 obliquely downward, the clamping force can be reduced to one side.

Next, the structure of the fixed platen 12 will be described with reference to FIGS. 1 and 4.

The fixed platen 12 is supported by the frame 11. The fixed platen 12 includes a fixed platen body 51 to which the fixed mold 32 is mounted, and support portions 52L and 52R that support the fixed platen body 51. Fixed platen body 51 and support portion 52L, The 52R can be formed integrally, or it can be formed separately and fixed with bolts or the like. As a fixing method, welding can also be used.

The fixed platen body 51 has a mold mounting surface on which the fixed mold 32 is mounted. The fixed mold 32 may be mounted on the fixed platen body 51 such that the center line of the fixed mold 32 is aligned with the center of the mold mounting surface of the fixed platen body 51. A front end portion of the tie bar 16 is fixed to the fixed platen body 51.

The support portions 52L and 52R are provided on the left and right sides with the fixed platen body 51 interposed therebetween. The support portions 52L and 52R support a central portion in the vertical direction of the side surface of the fixed platen body 51. That is, the support portions 52L and 52R support the side surfaces of the fixed platen body 51 at positions which are approximately the same distance from the center position of the frame 11 and the center of the mold mounting surface of the fixed platen body 51.

The support portions 52L and 52R support the center portion of the side surface of the fixed platen body 51 in the vertical direction, thereby separating the fixed platen body 51 from the frame 11. The support portions 52L and 52R are connected to the side surface of the fixed platen body 51 at one end portion and to the frame 11 at the other end portion.

The temperature of the mold device 30 is adjusted to a predetermined temperature by a temperature regulator. The heat of the fixed mold 32 moves to the frame 11 via the fixed platen body 51 and the support portions 52L and 52R.

In this embodiment, since the support portions 52L and 52R support the central portion of the side surface of the fixed platen body 51 in the vertical direction, the temperature distribution of the fixed platen body 51 is vertically symmetrical, unlike when supporting the lower surface 56 of the fixed platen body 51. Thereby, the fixed platen body 51 is thermally deformed vertically and vertically, and is kept perpendicular to the frame 11. As a result, the fixed mold 32 and the movable mold 33 are kept in parallel, and the clamping force is not easily deviated to one side.

In addition, in the present embodiment, the support portions 52L, 52R do not restrict the lower surface 56 of the fixed platen body 51, so the fixed platen body 51 can be thermally deformed in two directions, up and down. Thereby, the centerline of the fixed platen body 51 is not easily deviated up and down with respect to the frame 11, and the centerline of the fixed mold 32 is not easily deviated from the centerline of the movable mold 33.

As shown in FIG. 4, the support portions 52L and 52R have arm portions 53L and 53R extending linearly from the side of the fixed platen body 51 diagonally downward, and linearly extending downward from the front ends of the arm portions 53L and 53R. The pillar portions 54L and 54R. The left arm portion 53L and the left column portion 54L may be integrally formed, or may be formed separately and fixed with bolts or the like. Similarly, the right arm portion 53R and the right column portion 54R may be integrally formed, or may be formed separately and fixed with bolts or the like. The arm portions 53L and 53R transmit the force from the fixed platen body 51 diagonally downward.

As described above, the support portions 52L and 52R of this embodiment have a portion that transmits the force from the fixed platen body 51 diagonally downward, so that the moment generated in the support portions 52L and 52R due to the weight of the fixed platen body 51 can be changed. small. The support portions 52L and 52R are not easily deflected, and the center line of the fixed platen body 51 is not easily deviated up and down. Therefore, the mold clamping force is biased to one side.

In addition, the support portions 52L and 52R of this embodiment support the side surface of the fixed platen body 51, but may support the surface of the fixed platen body 51 on the side opposite to the mold mounting surface. As long as the support portions 52L and 52R have a portion that transmits the force from the fixed platen body 51 diagonally downward, the clamping force can be reduced to one side.

Next, the structure of the rear platen 15 will be described with reference to FIGS. 1 and 5.

The rear pressure plate 15 is supported by the frame 11. The rear platen 15 includes a rear platen body 61 and main body supporting portions 62L and 62R that support the rear platen body 61. The rear platen main body 61 and the main body supporting portions 62L and 62R may be integrally formed, or may be formed separately and fixed with bolts or the like. As a fixing method, welding can also be used.

A toggle mounting portion 65 to which the toggle mechanism 20 is mounted is provided on a face of the rear platen body 61 that faces the movable platen 13. The toggle attachment portion 65 is provided with, for example, a pair of upper and lower sides, and the first toggle lever 21 is swingably supported.

The main body support portions 62L and 62R are provided on the left and right sides with the rear platen body 61 interposed therebetween. The main body supporting portions 62L and 62R support a central portion in the vertical direction of the side surface of the rear platen body 61. That is, the main body supporting portions 62L, 62R support the side surfaces of the rear platen body 61 at positions substantially the same distance from the center position of the frame 11 and the rear platen body 61.

The main body supporting portions 62L and 62R support the center portion of the side surface of the rear platen body 61 in the vertical direction, thereby separating the rear platen body 61 from the frame 11. The main body support portions 62L and 62R are connected to the side surface of the rear platen main body 61 at one end portion and to the frame 11 at the other end portion.

As shown in FIG. 5, the main body supporting portions 62L and 62R have arm portions 63L and 63R extending linearly from the side of the rear plate main body 61 diagonally downward, and linearly extending downward from the front ends of the arm portions 63L and 63R. The pillars 64L and 64R. Left arm 63L and left pillar 64L It is integrally formed, or it may be formed separately and fixed with a bolt or the like. Similarly, the right arm portion 63R and the right column portion 64R may be integrally formed, or may be formed separately and fixed with bolts or the like. The arms 63L, 63R transmit the force from the rear platen body 61 diagonally downward.

In this way, the main body supporting portions 62L and 62R of this embodiment have portions that transmit the force from the rear platen main body 61 diagonally downward, so that it can be generated in the main body supporting portions 62L and 62R due to the weight of the rear platen main body 61. The torque becomes smaller. The main body support portions 62L and 62R are not easily deflected, and the center line of the rear platen body 61 is not easily deviated up and down, so the mold clamping force is biased to one side.

In addition, although the main body supporting portions 62L and 62R of the present embodiment support the side surface of the rear platen body 61, the surface (rear end surface) of the rear platen body 61 opposite to the toggle mechanism mounting surface may be supported. As long as the main body support portions 62L and 62R have a portion that transmits the force from the rear platen body 61 diagonally downward, the clamping force can be reduced to one side.

[Second Embodiment]

Fig. 7 is a cross-sectional view showing a state when the injection molding machine according to the second embodiment of the present invention has completed mold closing. Fig. 8 is a cross-sectional view showing the state of the injection molding machine according to the second embodiment of the present invention when the mold is opened. Fig. 9 is a cross-sectional view taken along the line IX-IX in Fig. 7 and a cross-sectional view of the rear pressure plate. Fig. 10 is a sectional view taken along line X-X in Fig. 7 and is a sectional view of the adsorption plate.

Injection molding machine 110 includes a frame 111 and is fixed to the frame 111 presses the rear platen 115 and the fixed platen 112 arranged at a distance from the rear platen 115. The rear pressure plate 115 and the fixed pressure plate 112 are connected by a plurality of (for example, four) tie bars 116. The axial direction of the tie rod 116 becomes the front-back direction. Since the tie rod 116 is allowed to extend during mold clamping, the fixed platen 112 is placed so as to be able to advance and retract relative to the frame 111.

The injection molding machine 110 further includes a movable platen 113 disposed between the fixed platen 112 and the rear platen 115. The movable pressure plate 113 is fixed on the left and right pair of sliders 114, and the sliders 114 move forward and backward along the guides 117L and 117R laid on the frame 111. Thereby, the movable platen 113 is free to contact and separate from the fixed platen 112. The movable pressure plate 113 has a notch at a position corresponding to the tie rod 116.

In addition, although the movable platen 113 of this embodiment has a notch at a position corresponding to each tie rod 116, it may have a through hole instead of the notch.

The movable mold 133 is mounted on a surface of the movable platen 113 that faces the fixed platen 112, and the fixed mold 132 is mounted on a surface of the fixed platen 112 that faces the movable platen 113. The mold device 130 includes a fixed mold 132 and a movable mold 133. When the movable platen 113 advances, the movable mold 133 contacts the fixed mold 132 and closes the mold. When the movable platen 113 is retracted, the movable mold 133 is separated from the fixed mold 132 and the mold is opened.

The injection molding machine 110 further includes a suction plate 118 that advances and retreats with the movable platen 113 and a rod 119 that connects the movable platen 113 and the suction plate 118 with an interval therebetween. The pressure plate 115 is provided with a hole through which the rod 119 passes after being disposed between the suction plate 118 and the movable pressure plate 113.

The suction plate 118 is fixed on the sliding base Sb, and the sliding base Sb moves forward and backward freely along the guides 117L and 117R. As a result, the suction plate 118 moves forward and backward freely than the rear platen 115.

The injection molding machine 110 further includes a linear motor 120 as a mold opening / closing driving unit that advances and retracts the movable platen 113. The linear motor 120 is disposed, for example, between the suction plate 118 advancing and retreating together with the movable platen 113 and the frame 111. In addition, the linear motor 120 may be disposed between the movable platen 113 and the frame 111.

The linear motor 120 includes a fixed member 121 and a movable member 122. The fixing member 121 is formed on the frame 111, and the movable member 122 is formed on the lower end of the sliding base Sb. When a predetermined current is supplied to the coil 123 of the movable element 122, the movable element 122 can advance and retreat by the interaction of a magnetic field formed by a current flowing through the coil 123 and a magnetic field formed by a permanent magnet of the fixed element 121. With this, the suction plate 118 and the movable platen 113 advance and retreat to perform mold closing and opening.

In addition, in this embodiment, the permanent magnet is disposed on the fixed member 121 and the coil 123 is disposed on the movable member 122. However, the coil may be disposed on the fixed member and the permanent magnet may be disposed on the movable member 122. Pieces. At this time, since the coil does not move with the driving of the linear motor 120, wiring for supplying power to the coil can be easily performed.

In addition, as the mold opening and closing drive unit, a rotary motor, a ball screw mechanism that converts the rotary motion of the rotary motor into a linear motion, or a fluid pressure cylinder (for example, a hydraulic cylinder) may be used instead of the linear motor 120.

The electromagnet 134 formed on the rear platen 115 and the electromagnet 134 formed on The adsorption portion 135 of the adsorption plate 118 constitutes a clamping force generating mechanism that generates a clamping force. When the electromagnet 134 is energized to drive the electromagnet 134, an adsorption force is generated between the electromagnet 134 and the adsorption portion 135, and a mold clamping force is generated. When the energization of the electromagnet 134 is stopped, the suction force disappears and the clamping force disappears.

In addition, in this embodiment, the electromagnet 134 is formed separately from the rear platen 115 and the adsorption portion 135 is formed separately from the adsorption plate 118. However, the electromagnet may be used as part of the rear platen 115 and the adsorption portion may be used as A part of the adsorption plate 118 is formed. In addition, the arrangement of the electromagnet and the suction portion may be reversed. For example, an electromagnet 134 may be provided on the suction plate 118 side, and a suction portion 135 may be provided on the rear platen 115 side.

Next, the operation of the injection molding machine 110 having the above-described configuration will be described with reference to FIGS. 7 and 8.

In a state where the mold opening is completed (the state in FIG. 8), the linear motor 120 is driven to advance the movable platen 113. In this way, as shown in FIG. 7, the movable mold 133 abuts against the fixed mold 132 to complete the mold closing. When the mold closing is completed, a predetermined gap δ is formed between the rear platen 115 and the suction plate 118, that is, between the electromagnet 134 and the suction portion 135. In addition, compared with the mold clamping force, the force required to close the mold is sufficiently small.

After completion of the mold closing, the electromagnet 134 is driven to generate an adsorption force between the electromagnet 134 and the adsorption portion 135 facing each other across a predetermined gap δ. By this suction force, a mold clamping force is generated between the movable platen 113 and the fixed platen 112. In addition, a cavity space (not shown) is formed between the fixed mold 132 and the movable mold 133 in the mold clamping state. Filling and melting of injection cavity into the cavity Resin, and the filled molten resin is solidified into a molded article.

After the mold clamping is completed, the linear motor 120 is driven to move the movable platen 113 backward. The movable mold 133 moves backward to open the mold. After the mold is opened, a not-shown ejection device ejects the molded product from the movable mold 133.

Since the fixed platen 112 has the same structure as the fixed platen 12 shown in FIG. 1 and FIG. 3, description thereof is omitted. In addition, since the movable platen 113 has the same structure as the movable platen 13 shown in FIGS. 1 and 4, description thereof is omitted.

Next, the structure of the rear platen 115 will be described with reference to FIGS. 7 and 9.

The rear pressure plate 115 is supported by the frame 111. The rear platen 115 includes a rear platen body 161 and main body supporting portions 162L and 162R that support the rear platen body 161. The rear pressure plate main body 161 and the main body supporting portions 162L and 162R may be integrally formed, or may be formed separately and fixed with bolts or the like. As a fixing method, welding can also be used.

A groove 137 for receiving the coil 136 of the electromagnet 134 is formed on the suction surface (rear end surface) of the rear platen body 161. The groove 137 is formed so as to surround the rod 119. A magnetic core 138 is formed inside the groove 137. A coil 136 is wound around the magnetic core 138. A yoke 139 is formed in a portion of the rear platen body 161 other than the magnetic core 138. When the electromagnet 134 is energized and the electromagnet 134 is driven, the electromagnet 134 attracts the adsorption portion 135 and generates a clamping force.

The support portions 162L and 162R are provided on the left and right sides with the rear platen body 161 interposed therebetween. Main body support sections 162L and 162R support the rear platen body The central part of the side of 161 in the vertical direction. That is, the main body supporting portions 162L and 162R support the side surfaces of the rear platen body 161 at positions substantially the same distance from the center position of the suction surface of the frame 111 and the rear platen body 161.

The main body support portions 162L and 162R support the center portion of the side surface of the rear platen body 161 in the vertical direction, thereby separating the rear platen body 161 from the frame 111. The main body support portions 162L and 162R are connected to the side surface of the rear platen main body 161 at one end portion and to the frame 111 at the other end portion.

When the electromagnet 134 is driven, the rear platen body 161 is heated by the Joule heat of the electromagnet 134. The heat of the rear platen body 161 moves to the frame 111 via the body support portions 162L and 162R.

In this embodiment, since the main body support portions 162L and 162R support the central portion in the vertical direction of the side surface of the rear platen body 161, the temperature distribution of the rear platen body 161 is vertically symmetrical, unlike when supporting the lower surface 166 of the rear platen body 161. As a result, the rear platen body 161 is thermally deformed symmetrically up and down, and remains perpendicular to the frame 111. As a result, the rear platen main body 161 and the suction plate main body 171 are parallel to each other and the suction force is not easily deflected to one side.

In addition, in this embodiment, the main body supporting portions 162L and 162R do not restrict the lower surface 166 of the rear platen body 161, so the rear platen body 161 can be thermally deformed in two directions, up and down. Thereby, the centerline of the rear platen body 161 is not easily deviated from the frame 111 up and down, and the centerline of the rear platen body 161 and the centerline of the suction plate body 171 are not easily deviated up and down.

As shown in FIG. 9, the main body supporting portions 162L and 162R have The arm portions 163L, 163R extending linearly from the side of the rear platen body 161 diagonally downward, and the pillar portions 164L, 164R extending linearly from the front ends of the arm portions 163L, 163R downward. The left arm portion 163L and the left column portion 164L may be integrally formed, or may be formed separately and fixed with bolts or the like. Similarly, the right arm portion 163R and the right pillar portion 164R may be integrally formed, or may be formed separately and fixed with bolts or the like. The arms 163L and 163R transmit the force from the rear platen body 161 diagonally downward.

As described above, the main body support portions 162L and 162R of this embodiment have a portion that transmits the force from the rear platen body 161 diagonally downward, so that it can be generated in the main body support portions 162L and 162R due to the weight of the rear platen body 161. The torque becomes smaller. The main body support portions 162L and 162R are not easily deflected, and the center line of the rear platen body 161 is not easily deviated up and down, so the clamping force is biased to one side relatively small.

In addition, although the main body support portions 162L and 162R of this embodiment support the side surface of the rear platen body 161, the surface (front end surface) of the rear platen body 161 opposite to the suction surface may be supported. As long as the main body supporting portions 162L and 162R have a portion that transmits the force from the rear platen body 161 diagonally downward, the clamping force can be reduced to one side.

Next, the structure of the adsorption plate 118 will be described with reference to FIGS. 7 and 10.

The suction plate 118 is supported by the frame 111 via a slide base Sb, guides 117L, 117R, and the like. The suction plate 118 includes a suction plate main body 171 and main body supporting portions 172L and 172R that support the suction plate main body 171. The suction plate main body 171 and the main body supporting portions 172L and 172R may be integrated It can also be formed separately and fixed with bolts or the like. As a fixing method, welding can also be used.

An adsorption portion 135 adsorbed by the electromagnet 134 is formed on the adsorption surface (front end surface) of the adsorption plate main body 171 from the adsorption surface to a predetermined depth. The suction portion 135 is formed in a portion surrounding the rod 119.

The main body supporting portions 172L and 172R are provided on the left and right sides with the suction plate main body 171 therebetween. The main body supporting portions 172L and 172R support the central portions in the vertical direction of the side surfaces of the suction plate main body 171. That is, the main body support parts 172L and 172R support the side surface of the adsorption | suction plate main body 171 at the position substantially equal to the center position of the adsorption | suction surface of the adsorption | suction plate main body 171 of the chassis 111.

The main body supporting portions 172L and 172R support the center portion of the side surface of the suction plate main body 171 in the vertical direction, thereby separating the suction plate main body 171 from the slide base Sb or the frame 111. The main body support portions 172L and 172R are connected to the side surface of the suction plate main body 171 at one end portion and connected to the slide base Sb at the other end portion.

In addition, if the magnetic flux of the electromagnet 134 changes at the start and end of the mold clamping, an eddy current flows through the adsorption plate main body 171 where the adsorption portion 135 is formed, and the adsorption plate main body 171 generates heat. The heat of the suction plate main body 171 moves to the frame 111 via the main body supporting portions 172L, 172R, and the like.

In this embodiment, since the main body supporting portions 172L and 172R support the central portion of the side surface of the adsorption plate main body 171 in the vertical direction, the temperature of the adsorption plate main body 171 is different from that when the lower surface 176 of the adsorption plate main body 171 is supported. The degree distribution becomes symmetrical up and down. As a result, the suction plate main body 171 is thermally deformed vertically and vertically, and is kept perpendicular to the frame 111. As a result, the suction plate main body 171 and the rear platen main body 161 are held in parallel, and it is difficult for the suction force to deviate to one side.

In addition, in the present embodiment, the main body supporting portions 172L and 172R do not restrict the lower surface 176 of the suction plate main body 171, and therefore, the suction plate main body 171 can be thermally deformed in two directions. Thereby, the centerline of the adsorption plate main body 171 is not easily deviated from the frame 111 up and down, and the centerline of the rear platen main body 161 and the centerline of the adsorption plate main body 171 are not easily deviated upward or downward.

As shown in FIG. 10, the main body supporting portions 172L and 172R have arm portions 173L and 173R extending linearly from the side of the suction plate main body 171 diagonally downward, and linearly extending downward from the front ends of the arm portions 173L and 173R Column sections 174L, 174R. The left arm portion 173L and the left column portion 174L may be integrally formed, or may be formed separately and fixed with bolts or the like. Similarly, the right arm portion 173R and the right pillar portion 174R may be integrally formed, or may be formed separately and fixed with bolts or the like. The arms 173L and 173R transmit the force from the suction plate main body 171 diagonally downward.

As described above, the main body supporting portions 172L and 172R of this embodiment have a portion that transmits the force from the suction plate main body 171 diagonally downward. This makes it possible to reduce the moment generated in the main body supporting portions 172L and 172R due to the weight of the suction plate main body 171. The main body support portions 172L and 172R are not easily deflected, and the center line of the suction plate main body 171 is not easily deviated upward and downward, and therefore the clamping force is biased to one side.

In addition, the main body supporting portions 172L and 172R of this embodiment The side surface of the adsorption plate main body 171 is supported, but a surface (rear end surface) of the adsorption plate main body 171 opposite to the adsorption surface may be supported. As long as the main body supporting portions 172L and 172R have a portion that transmits the force from the suction plate main body 171 diagonally downward, the mold clamping force is biased to one side relatively small.

As mentioned above, although the embodiment of the injection molding machine was demonstrated, this invention is not limited to the said embodiment, Various deformation | transformation and improvement are possible within the range of the objective described in the range of a technical solution.

For example, although the support part of the movable platen of the said embodiment has a pillar part, it may not have a pillar part, and may be comprised only with an arm part. In addition, the arm portion is linear, but may be curved. The same applies to the fixed platen, the rear platen, and the adsorption plate. Hereinafter, a modification of the support portion of the movable platen will be described with reference to FIG. 11.

FIG. 11 is a diagram showing a modification of FIG. 3. The support portions 242L and 242R of the movable platen 213 according to this modification include curved arm portions 243L and 243R. The content of this modification can also be applied to a fixed platen, a rear platen, and an adsorption plate.

As shown in FIG. 11, the movable platen 213 includes a movable platen body 241 to which a movable mold is mounted, and support portions 242L and 242R that support the movable platen body 241. The support portions 242L and 242R include curved arm portions 243L and 243R extending from the movable platen body 241 and pillar portions 244L and 244R extending downward from the front ends of the arm portions 243L and 243R. In this way, the arm portions 243L and 243R may have a curved shape. The force from the movable platen main body 241 is transmitted diagonally downward halfway through the arm portions 243L and 243R.

Claims (4)

An injection molding machine is provided with a platen to which a mold is mounted, the platen includes a platen body to which the mold is mounted, and a support portion supporting the platen body, and the support portion supports a central portion in a vertical direction of a side surface of the platen body. The support portion includes an arm portion that transmits the force from the platen body diagonally downwardly and diagonally downward from the side of the platen body, and a pillar portion that extends downward from the front end of the arm portion. The arm portion has a lower surface continuous downward and obliquely. The injection molding machine according to item 1 of the scope of patent application, further comprising a back platen connected through a tie rod to a fixed platen on which a fixed mold is mounted, the rear platen includes a platen body after the aforementioned tie rod is fixed, and the rear platen is supported. A main body supporting portion of the main body, the main body supporting portion including a portion that transmits the force from the rear platen main body diagonally downward. The injection molding machine according to item 1 of the patent application scope, comprising: a first member formed with an electromagnet; and a second member formed with an adsorption portion adsorbed by the electromagnet, the electromagnet and the adsorption being formed A clamping force generating mechanism that generates a clamping force is included in at least one of the first member and the second member, and includes a main body on which a member that generates the clamping force is formed, and a main body support portion that supports the main body. The main body support portion includes a portion that transmits a force from the main body diagonally downward. An injection molding machine comprising: a first member formed with an electromagnet; a second member formed with an adsorption portion adsorbed by the electromagnet; and a frame supporting the first member and the second member. The electromagnet and the adsorption portion constitute a clamping force generating mechanism that generates a clamping force. At least one of the first member and the second member includes a main body formed with a member that generates the clamping force, and a support that supports the main body. A main body support portion that supports a central portion in a vertical direction of a side surface of the main body, the main body support portion including an arm portion that transmits a force from the main body diagonally downwardly and extends downward from the side surface of the main body, And a pillar portion extending downward from the front end of the arm portion, and the arm portion of the main body support portion has a continuous lower surface inclined downward.