TW201607730A - Injection molding machine - Google Patents

Abstract

The present invention provides an injection molding machine. The subject thereof is to provide an injection molding machine capable of centralizing the power to push back the central portion of a mold and increasing an installation feasibility of the mold. This invention is provided with an injection molding machine in which a pressing plate for mold installation. The injection molding machine comprises: a middle member configured between the mold and the pressing plate; a central connection member configured to be further inside in comparison with the outer periphery of the mold when viewed in the mold opening/closing direction; and a periphery connection member configured around the central connection member when viewed in the mold opening/closing direction. The central connection member and the periphery connection member are respectively configured at least either between the middle member and the pressing plate or between the mold and the middle member. The mold is installed in the pressing plate through the middle member, the central connection member and the periphery connection member.

Description

Injection molding machine

The present application claims priority based on Japanese Patent Application No. 2014-174243, filed on August 28, 2014. The entire contents of this application are incorporated herein by reference.

The present invention relates to an injection molding machine.

The injection molding machine includes a mold clamping device for mold closing, mold clamping, and mold opening of the mold device, an injection device for filling a molding material (for example, resin) in the mold device, and an ejection device for ejecting the molded product from the mold device (for example, See patent document 1). The mold clamping device has a fixed pressure plate on which a fixed mold is mounted and a movable pressure plate on which a movable mold is mounted. The mold device is composed of a fixed mold and a movable mold. Hereinafter, when the fixed mold and the movable mold are not distinguished, it is simply referred to as a mold. Moreover, when the fixed platen and the movable platen are not distinguished, it is simply referred to as a platen.

(previous technical literature) (Patent Literature)

Patent Document 1: International Publication No. 2005/068155

Conventionally, when a molding material is filled into a mold device, the center portion of the mold device may be slightly opened by the pressure of the molding material, and defects such as uneven thickness or burrs of the molded article may occur.

Since the pressure of the molding material is concentrated on the central portion of the mold, it is known to arrange the member that is concentratedly pushed back to the central portion of the mold between the mold and the pressure plate.

This member only supports the central portion of the mold. Therefore, it is difficult to ensure the parallelism between the mold and the pressure plate, and the mounting space of the mold is reduced due to the narrow installation space of the mounting bolts and the like.

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 pushing back a center portion of a mold in a concentrated manner and improving the mountability of the mold.

In order to solve the above problems, according to an aspect of the present invention, an injection molding machine including a pressure plate for mounting a mold is provided, comprising: an intermediate member disposed between the mold and the pressure plate; and a central coupling member at the mold When viewed in the opening and closing direction, it is disposed on the inner side of the outer periphery of the mold; and the peripheral connecting member is disposed around the center connecting member when viewed in the mold opening and closing direction, and the center connecting member and the peripheral connecting member are respectively disposed Set at At least one of the intermediate member and the pressure plate, and between the mold and the intermediate member, the mold is transmitted through the intermediate member, the center connecting member, and the peripheral connecting member to the pressure plate.

According to an aspect of the present invention, an injection molding machine capable of pushing back a center portion of a mold and capable of improving the mountability of the mold can be provided.

10‧‧‧Molding device

12‧‧‧Fixed platen

13‧‧‧ movable platen

30‧‧‧Molding device

32‧‧‧Fixed mode

33‧‧‧ movable mold

51‧‧‧Intermediate components

52‧‧‧Central joint components

53‧‧‧ Peripheral connecting members

61‧‧‧Intermediate components

62‧‧‧Central joint components

63‧‧‧ Peripheral connecting members

Fig. 1 is a view showing a state at the time of completion of mold closing of an injection molding machine according to an embodiment of the present invention.

Fig. 2 is a view showing a state at the time of completion of mold opening of the injection molding machine according to the embodiment of the present invention.

Fig. 3 is a cross-sectional view taken along line III-III of Fig. 2, showing a positional relationship between a fixed platen, a fixed mold, and a member disposed therebetween when viewed in the mold opening and closing direction.

Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 3, which is a view showing a positional relationship between a fixed platen, a fixed mold, and a member disposed therebetween when viewed from the side.

Hereinafter, the form for carrying out the invention will be described with reference to the drawings, but in the drawings, the same or corresponding structures are labeled the same or corresponding. The component symbols are omitted and the description is omitted.

Fig. 1 is a view showing a state at the time of completion of mold closing of an injection molding machine according to an embodiment of the present invention. Fig. 2 is a view showing a state at the time of completion of mold opening of the injection molding machine according to the embodiment of the present invention. As shown in FIGS. 1 and 2, the injection molding machine has a frame Fr, a mold clamping device 10, an injection device 40, and an ejection device 70.

The mold clamping device 10 performs mold closing, mold clamping, and mold opening of the mold device 30. The mold device 30 is composed of a fixed mold 32 and a movable mold 33.

The mold clamping device 10 has a fixed platen 12, a movable platen 13, a rear platen 15, a tie rod 16, a toggle mechanism 20, a mold clamping motor 21, and a motion conversion mechanism 25. In the following, the moving direction of the movable platen 13 at the time of closing the mold (the right direction in the first drawing and the second drawing) is the front direction, and the moving direction of the movable platen 13 at the time of mold opening (the left direction in the first drawing and the second drawing) ) is explained as the rear.

The fixed platen 12 is fixed to the frame Fr. A fixed mold 32 is attached to a surface of the fixed platen 12 that faces the movable platen 13. The fixed mold 32 is attached to the fixed platen 12 through the intermediate member 51, the center connecting member 52, the peripheral connecting member 53, and the like.

The movable platen 13 is freely movable along a guide (for example, a guide rail) 17 laid on the frame Fr, and is 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 that faces the fixed platen 12. Similarly to the fixed mold 32, the movable mold 33 is attached to the movable platen 13 through the intermediate member 61, the center connecting member 62, the peripheral connecting member 63, and the like.

By moving the movable platen 13 back and forth relative to the fixed platen 12, The movable mold 33 advances and retreats relative to the fixed mold 32 to perform mold closing, mold clamping, and mold opening of the mold apparatus 30.

The rear platen 15 is coupled to the fixed platen 12 through a plurality of (for example, four) tie bars 16, and is movably placed on the frame Fr in the mold opening and closing direction. In addition, the rear platen 15 can also move freely along the guides laid on the frame Fr. The guide of the rear platen 15 can also be used in common with the guide 17 of the movable platen 13.

Further, in the present embodiment, the fixed pressure plate 12 is fixed to the frame Fr, and the rear pressure plate 15 is movable in the mold opening and closing direction with respect to the frame Fr. However, the rear pressure plate 15 may be fixed to the frame Fr, and the fixed pressure plate 12 may be fixed with respect to the frame Fr. It moves freely in the mold opening and closing direction.

The tie rod 16 is parallel to the mold opening and closing direction and extends in accordance with the mold clamping force. A mold clamping force detector is provided on at least one of the tie bars 16. The mold clamping force detector can perform a strain ritual to detect the clamping force by detecting the deformation of the tie rod.

Further, the mold clamping force detector is not limited to the strain ceremony, and may be a piezoelectric type, a capacity type, a hydraulic type, an electromagnetic type or the like, and the mounting position is not limited to the tie rod 16.

The toggle mechanism 20 is disposed between the movable platen 13 and the rear platen 15. The toggle mechanism 20 is composed of a crosshead 20a, a plurality of links 20b, 20c, and the like. One of the links 20b is swingably attached to the movable platen 13, and the other link 20c is swingably attached to the rear platen 15. These links 20b and 20c are connected to each other by a pin or the like so as to be expandable and contractible. By advancing and retracting the crosshead 20a, the plurality of links 20b, 20c are expanded and contracted to be movable. The pressure plate 13 advances and retreats relative to the rear pressure plate 15.

The mold clamping motor 21 is attached to the rear pressure plate 15, and the movable platen 13 is advanced and retracted by advancing and retracting the crosshead 20a. Between the mold clamping motor 21 and the crosshead 20a, a motion conversion mechanism 25 that converts the rotational motion of the mold clamping motor 21 into a linear motion for transmission to the crosshead 20a is provided.

In the mold closing process, the mold clamping device 10 drives the mold clamping motor 21 to advance the movable platen 13. The mold closing process is terminated by bringing the movable mold 33 into contact with the fixed mold 32. Thereafter, in the mold clamping process, the mold clamping motor 21 is further driven to generate a mold clamping force based on the urging force of the mold clamping motor 21 multiplied by the toggle ratio. A cavity space 34 is formed between the movable die 33 and the fixed die 32 during mold clamping. The injection device 40 fills the cavity space 34 with a liquid molding material. After the molding material in the cavity space 34 is solidified, an open molding process is performed. In the mold opening process, the mold clamping device 10 drives the mold clamping motor 21 to move the movable platen 13 backward. After the mold opening is completed, the ejector unit 70 ejects the molded article from the movable mold 33.

Further, the mold clamping device 10 of the present embodiment includes the mold clamping motor 21 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 21. Further, the mold clamping device 10 may have a linear motor for mold opening and closing, and has an electromagnet for clamping.

Next, the members 51 to 53 disposed between the fixed mold 32 and the fixed platen 12 will be described with reference to FIGS. 3 and 4. In addition, the members 61 to 63 disposed between the movable mold 33 and the movable platen 13 have the same structure, and description thereof will be omitted.

Figure 3 is a cross-sectional view taken along line III-III of Figure 2, which is shown in A diagram showing the positional relationship between the fixed platen, the fixed mold, and the members disposed between them when viewed in the mold opening and closing direction. Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 3, which is a view showing a positional relationship between a fixed platen, a fixed mold, and a member disposed therebetween when viewed from the side.

As shown in FIG. 4, an intermediate member 51, a center connecting member 52, and a peripheral connecting member 53 are disposed between the fixed die 32 and the fixed platen 12. The fixed mold 32 is attached to the fixed platen 12 through the intermediate member 51, the center connecting member 52, and the peripheral connecting member 53. Use bolts or clamps for installation.

As shown in FIG. 4, the intermediate member 51 is disposed between the fixed die 32 and the fixed platen 12. The central portion and the outer peripheral portion of the intermediate member 51 are coupled to the fixed platen 12 by bolts or the like. The intermediate member 51 is formed, for example, in a plate shape, and the front and rear faces of the intermediate member 51 are perpendicular to the mold opening and closing direction.

As shown in Fig. 3, notches can be formed at the four corners of the intermediate member 51 to avoid interference with the tie rod 16. Alternatively, an insertion hole through which the tie rod 16 is inserted may be formed instead of the notch.

As shown in Fig. 4, a central portion of the intermediate member 51 may be formed with a through hole for alignment with the fixed mold 32. The center line of the intermediate member 51 may be on the same line as the center line of the fixed mold 32.

Further, the through hole formed in the central portion of the intermediate member 51 can also be used to pass the nozzle 41 of the injection device 40. The nozzle 41 is in contact with the fixed mold 32 through a nozzle through hole 12a formed in a central portion of the fixed platen 12.

As shown in FIG. 3, when viewed in the mold opening and closing direction, the center connecting member 52 is disposed on the inner side of the outer periphery of the fixed mold 32, for example, formed in a circular shape. shape. Further, the shape of the central connecting member 52 may be an elliptical shape or a polygonal shape such as a rectangular shape, and is not particularly limited. The center line of the center joint member 52 and the center line of the fixed mold 32 may be on the same straight line.

As shown in FIG. 4, the center joint member 52 is formed, for example, in a plate shape, and is disposed between the intermediate member 51 and the fixed platen 12, and is used to connect the intermediate member 51 and the fixed platen 12. The central connecting member 52 is integrally formed with the intermediate member 51 in Fig. 4, but may be integrally formed with the fixed platen 12 or may be formed separately from the intermediate member 51 and the fixed platen 12.

Further, the center connecting member 52 of the present embodiment is disposed between the intermediate member 51 and the fixed platen 12 and is used to connect the intermediate member 51 and the fixed platen 12, but may be disposed between the intermediate member 51 and the fixed die 32. It is used to join the intermediate member 51 and the fixed mold 32. At this time, the central joint member 52 may be integrally formed with the intermediate member 51, or may be integrally formed with the fixed mold 32, or may be formed separately from the intermediate member 51 and the fixed mold 32. The central connecting member 52 may be disposed between the intermediate member 51 and the fixed die 32 and between the intermediate member 51 and the fixed platen 12, respectively.

As shown in Fig. 4, a through hole through which the nozzle 41 passes can be formed in the central portion of the center connecting member 52.

As shown in FIG. 3, when viewed in the mold opening and closing direction, the peripheral connecting member 53 is disposed around the peripheral connecting member 53, and is formed, for example, in a circular shape. Further, the shape of the peripheral connecting member 53 may be a polygonal shape such as an elliptical shape or a rectangular shape, and is not particularly limited. When viewed in the mold opening and closing direction, the peripheral connecting member 53 can be disposed outside the outer circumference of the fixed mold 32. and, When viewed in the mold opening and closing direction, the peripheral connecting member 53 may be disposed between the plurality of tie rods 16, and may be disposed, for example, on a line connecting the centers of the plurality of tie rods 16.

As shown in FIG. 4, the peripheral connecting member 53 is formed, for example, in a plate shape, and is disposed between the intermediate member 51 and the fixed platen 12, and is used to connect the intermediate member 51 and the fixed platen 12. The peripheral connecting member 53 is integrally formed with the intermediate member 51 in Fig. 4, but may be integrally formed with the fixed platen 12 or may be formed separately from the intermediate member 51 and the fixed platen 12.

Further, the peripheral connecting member 53 of the present embodiment is disposed between the intermediate member 51 and the fixed platen 12, and is used to connect the intermediate member 51 and the fixed platen 12, but may be disposed between the intermediate member 51 and the fixed die 32, And used to connect the intermediate member 51 and the fixed mold 32. At this time, the peripheral connecting member 53 may be integrally formed with the intermediate member 51, or may be integrally formed with the fixed mold 32, or may be formed separately from the intermediate member 51 and the fixed mold 32.

In addition, the peripheral connecting member 53 of the present embodiment is disposed outside the outer circumference of the fixed mold 32 when viewed in the mold opening and closing direction, but may be disposed further inside than the outer circumference of the fixed mold 32. At this time, the center connecting members 52 are disposed between the intermediate member 51 and the fixed mold 32 and between the intermediate member 51 and the fixed pressure plate 12, respectively.

As shown in Fig. 3, the number of the peripheral connecting members 53 may be plural, and may be arranged in point symmetry about the center line L0 of the fixed mold 32 when viewed in the mold opening and closing direction. In the third drawing, a pair of peripheral connecting members 53 are arranged in point symmetry using a complex array, but a set may be used.

When viewed in the mold opening and closing direction, the plurality of peripheral connecting members 53 may be symmetrically arranged with respect to the line between the two tie bars 16. For example, when viewed in the mold opening and closing direction, the plurality of peripheral connecting members 53 may be symmetrically arranged with respect to the line L1 between the upper tie rod 16 and the lower tie rod 16 as a reference. This line L1 can be a line equidistant from the tie rod 16 on the upper side and the tie rod 16 on the lower side. Further, when viewed in the mold opening and closing direction, the plurality of peripheral connecting members 53 may be symmetrically arranged with respect to the line L2 between the left tie rod 16 and the right tie rod 16. This line L2 can be a line equidistant from the tie rod 16 on the left side and the tie rod 16 on the right side.

Further, when viewed in the mold opening and closing direction, the plurality of peripheral connecting members 53 may be symmetrically arranged with respect to the line connecting the centers of the two tie bars 16. For example, the plurality of peripheral connecting members 53 may be arranged symmetrically with respect to the line L3 connecting the center of the left upper side tie rod 16 and the center of the lower right side tie rod 16 as a reference. Further, the plurality of peripheral connecting members 53 may be arranged symmetrically with respect to the line L4 connecting the center of the left lower side tie rod 16 and the center of the upper right side tie rod 16.

Further, although the number of the peripheral connecting members 53 of the present embodiment is plural, one may be used. The one peripheral connecting member 53 may be formed in a ring shape, and may be formed, for example, in an annular shape, a quadrangular ring shape, or the like.

As described above, according to the present embodiment, the central connecting member 52 can be disposed more inside than the outer circumference of the fixed mold 32 and smaller than the fixed mold 32 when viewed in the mold opening and closing direction. By this, it is possible to push back the center portion of the fixed mold 32 in a concentrated manner against the pressure of the molding material in the mold device 30, and it is possible to suppress the occurrence of defects such as thickness unevenness or burrs of the molded article. and Further, according to the present embodiment, the peripheral connecting member 53 is disposed around the center connecting member 52 when viewed in the mold opening and closing direction. Compared with the case where the peripheral connecting member 53 is absent, it is easy to ensure the parallelism between the fixed mold 32 and the fixed platen 12, and the installation space of the bolt or the like for mounting is wide, and the mountability of the fixed mold 32 can be improved.

Further, according to the present embodiment, the peripheral connecting member 53 is disposed outside the outer circumference of the fixed mold 32 when viewed in the mold opening and closing direction. By this, it is possible to push back the center portion of the fixed mold 32 more strongly against the pressure of the molding material in the mold device 30, and it is possible to further suppress the occurrence of defects such as thickness unevenness or burrs of the molded article.

Further, according to the present embodiment, the number of the peripheral connecting members 53 is plural, and they are arranged symmetrically when viewed in the mold opening and closing direction. Thereby, it is easier to ensure the parallelism of the fixed die 32 and the fixed platen 12. Further, the balance of the stress distribution of the fixed mold 32 is good.

Further, in the present embodiment, the center line of the plurality of peripheral connecting members 53 is not on the same circle centered on the center line of the fixed mold 32 when viewed in the mold opening and closing direction, but may be located on the same circle. At this time, the balance of the stress distribution of the fixed mold 32 can be further improved.

Further, according to the present embodiment, the peripheral connecting member 53 is disposed with the tie rod 16 as a reference when viewed in the mold opening and closing direction. Thereby, the balance at the time of mold clamping can be further improved.

When viewed in the mold opening and closing direction, the center connecting member 52 may be formed such that the gate of the cavity space 34 is located further inside than the outer circumference of the center connecting member 52. Because of the higher pressure of the forming material near the gate Potential.

Further, as shown in Fig. 4, the outer peripheral surface of the center connecting member 52 of the above-described embodiment is parallel to the mold opening and closing direction, but may be inclined with respect to the mold opening and closing direction. In other words, the center connecting member 52 may have a tapered shape in which the cross section perpendicular to the mold opening and closing direction is increased from the fixed platen side (front side) to the fixed die side (rear side). The cone can be either a straight cone or a curved cone. The center joint member 52 has the above-described tapered shape, whereby the flexural deformation of the fixed platen 12 can be offset.

In the above, the embodiment of the injection molding machine has been described. However, the present invention is not limited to the above-described embodiments and the like, and various modifications and improvements can be made within the scope of the invention as described in the claims.

Further, the mold clamping device 10 of the above-described embodiment is a horizontal type in which the mold opening and closing direction is horizontal, but a vertical form in which the mold opening and closing direction is a vertical direction may be used. The vertical mold clamping device has a lower platen as a fixed platen, an upper platen as a movable platen, and the like. A lower die is mounted on the lower platen, and an upper die is mounted on the upper platen. The mold device is composed of a lower mold and an upper mold. The lower mold can be attached to the lower platen through the rotary table. The vertical mold clamping device performs mold closing, mold clamping, and mold opening of the mold device by raising and lowering the upper platen relative to the lower platen. The nozzle of the injection device is in contact with the upper mold through the nozzle through hole of the upper platen.

12‧‧‧Fixed platen

12a‧‧‧Nozzle through hole

16‧‧‧ tied

32‧‧‧Fixed mode

51‧‧‧Intermediate components

52‧‧‧Central joint components

53‧‧‧ Peripheral connecting members

The center line of the L0‧‧‧ fixed mold

Line between L1‧‧‧ upper tie and lower tie

L2‧‧‧The line between the left tie and the right tie

L3‧‧‧ link the center line of the upper left side tie and the center line of the lower right side tie rod

L4‧‧‧ links the center of the left lower tie and the center line of the upper right tie

Claims (10)

An injection molding machine comprising: a press plate for mounting a mold, wherein the injection molding machine includes: an intermediate member disposed between the mold and the pressure plate; and a central connecting member disposed in the mold opening and closing direction; The outer periphery of the mold is further inside; and the peripheral connecting member is disposed around the central connecting member when viewed in the mold opening and closing direction, and the central connecting member and the peripheral connecting member are disposed between the intermediate member and the platen And at least one of the mold and the intermediate member, wherein the mold is attached to the pressure plate through the intermediate member, the center connecting member, and the peripheral connecting member. The injection molding machine according to the first aspect of the invention, wherein the peripheral connection member is disposed between the intermediate member and the pressure plate, and is disposed outside the outer circumference of the mold when viewed in the mold opening and closing direction. The injection molding machine according to the first or second aspect of the invention, wherein the injection molding machine has a plurality of tie bars that extend in accordance with a mold clamping force, and the peripheral connection member is disposed in the mold opening and closing direction. A plurality of the aforementioned connecting rods. The injection molding machine according to claim 1 or 2, wherein the plurality of peripheral connecting members are plural. The injection molding machine according to claim 4, wherein the plurality of the peripheral connecting members are symmetrically arranged when viewed in the mold opening and closing direction. The injection molding machine according to the fifth aspect of the invention, wherein the plurality of the peripheral connecting members are arranged in point symmetry about a center line of the mold when viewed in a mold opening and closing direction. The injection molding machine according to the fifth aspect of the invention, wherein the plurality of the peripheral connecting members are symmetrically arranged with respect to a line between the two tie bars when viewed in the mold opening and closing direction. The injection molding machine according to the fifth aspect of the invention, wherein the plurality of the peripheral connecting members are symmetrically arranged with respect to a line connecting the centers of the two tie bars when viewed in the mold opening and closing direction. The injection molding machine according to claim 1 or 2, wherein the peripheral connecting members are one. The injection molding machine of claim 9, wherein The peripheral connecting member is formed in a ring shape.