JP2013086331A - Injection molding machine equipped with adapter plate including temperature control piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine which features that a region for binding an adapter and a mold platen together which is used when a mold is fitted to the mold platen, is smaller in area than the area where the mold is fitted to the adapter, and since piping for a temperature control medium is arranged at least in the region for joining the adapter and the mold platen together is arranged, the internal temperature of the region which is a spot where the heat of the mold is transmitted to the mold platen can be controlled, and in turn, the temperature of the mold can be uniformly distributed.SOLUTION: This injection molding machine includes an adapter plate 30 (30a and 30b) for assembling the mold (31a and 31b) to the mold platen (stationary platen 11 and movable platen 12). The adapter plate 30 has the side for fitting to the mold platen and the side for fitting to the mold. In addition, the side for fitting to the mold platen includes a binding part 32 (32a and 32b) accounting for a smaller area than the side for fitting to the mold (31a and 31b). Besides, piping 33 is internally arranged at the adapter plate 30 which corresponds with at least the region where the binding part 32 is arranged.

Description

  The present invention relates to an injection molding machine provided with an adapter plate with temperature control piping.

  In precision molding such as lens molding, slight deviation of the mold affects the molded product. Therefore, it is necessary to perform the mold opening / closing operation with high accuracy. As for the accuracy of mold opening and closing, the parallelism and positional deviation (eccentricity) of the fixed platen and movable platen affect the molded product. The cause of the deterioration of the accuracy is thermal deformation of the molding machine. In precision molding of lenses and the like, molding may be performed at a mold temperature of 80 to 130 ° C. At that time, the temperature of the mold is transmitted to the board surface, and further to the mold clamping mechanism, which causes the parallelism of the board surface to deteriorate. Therefore, it is necessary to prevent the mold clamping part of the injection molding machine from being affected by the heat of the mold. Patent Documents 1 and 2 disclose techniques for preventing the mold clamping portion of the injection molding machine from being affected by the mold.

JP 2003-266478 A JP-A-9-29747

  In many cases, the lower side of the fixed plate or the movable plate is connected to the base frame or is in contact with the base frame, so that heat easily escapes and a temperature difference increases in the vertical direction of the plate surface. Also, as disclosed in Patent Document 1, there is a method of attaching a sensor to detect the inclination of the fixed platen and controlling the correction to correct the inclination, but a sensor or the like is required, resulting in an expensive system. Further, since it is necessary to directly process the board surface, it is very difficult to apply to a machine that has already been assembled. In the technique disclosed in Patent Document 2, a detachable heat insulating unit is known. However, since this heat insulating unit is in close contact with the entire surface of the panel, the contact area with the panel is large. Therefore, in order to prevent the transmission of heat, a large amount of energy is required for cooling the heat insulating unit.

  Accordingly, an object of the present invention is to take into account the problems of the prior art described above, so that the coupling region between the adapter and the mold plate used when mounting the mold on the mold plate is smaller than the mounting surface of the mold on the adapter. And, by providing the temperature adjusting medium pipe at least in the bonding area, the temperature in the bonding area, where the heat of the mold is transmitted to the mold plate, can be adjusted. An object of the present invention is to provide an injection molding machine capable of making the temperature distribution uniform.

The invention according to claim 1 of the present application is an injection molding machine having an adapter plate for attaching a mold to a mold board, wherein the adapter plate has a surface to be attached to the mold board and a surface to be attached to the mold, An adapter having a coupling portion having an area smaller than an area of the mounting surface of the mold on a surface to be attached to the mold plate and having a pipe in the adapter plate corresponding to at least the region provided with the coupling portion. An injection molding machine having a plate.
The invention according to claim 2 is an injection molding machine having an adapter plate for attaching a mold to a mold platen, wherein the adapter plate has a surface to be attached to the mold platen and a surface to be attached to the die. The plate is attached to the surface of the mold plate via a shim that is smaller than the area of the mounting surface of the mold, and the adapter has piping in at least the area of the adapter plate that the shim contacts. An injection molding machine having an adapter plate characterized by the above.
The invention according to claim 3 is the injection molding machine having the adapter plate according to any one of claims 1 and 2, characterized in that a pipe is formed around the connecting portion of the mold platen.

  According to the present invention, the coupling region between the adapter and the mold platen used when attaching the mold to the mold platen has a smaller area than the mounting surface of the mold to the adapter, and at least the temperature adjusting medium in the coupling region. By providing the piping, it is possible to adjust the temperature in the bonding region where the heat of the mold is transmitted to the mold plate, and thereby an injection molding machine that can make the temperature distribution of the mold uniform. Can be provided.

It is sectional drawing explaining embodiment of this invention. It is a figure explaining the adapter plate used for embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention.
The injection molding machine is generally composed of an injection device (not shown) and a mold clamping device 10. The injection device includes a cylinder, a screw that can be driven in the rotation direction and the axial direction in the cylinder, and a drive unit that drives the screw in the rotation direction and the axial direction. The toggle link mechanism 22 of the injection device is a fixed platen 11 fixed on a machine base (not shown), and a mold clamping which is provided on the machine table so as to be movable in the axial direction at a distance from the fixed platen 11. .. Are guided and moved in the axial direction by the four tie bars 14, 14,... Provided between the platen 13, the fixed platen 11 and the mold clamping machine 13. The movable platen 12 includes a toggle link mechanism 22 that drives the movable platen 12 in the mold closing direction or mold opening direction, a movable plate forward / reverse servomotor 17 that drives the toggle link mechanism 22, and the like.

  One end of the tie bar 14 is passed through insertion holes at four corners of the fixed platen 11 and is fixed to the fixed platen 11. The other end of the tie bar 14 passes through the four corners of the mold clamping machine 13 and extends to the outside. .. Are screwed into the mold thickness adjusting nuts 15, 15... Provided on the mold clamping machine 13. In FIG. 1, tie bars 14 and 14 are omitted between the movable platen 12 and the mold clamping plate 13. The four mold thickness adjusting nuts 15 are driven to rotate by a mold thickness adjusting servo motor 16. As the mold thickness adjusting nuts 15, 15,... Rotate, the position of the mold clamping machine 13 is adjusted on the machine base (not shown), and the mold clamping force is adjusted.

  An insertion hole is formed in the central portion of the mold clamping machine 13, and a ball nut 25 is rotatably provided outside the mold clamping machine 13 so as to be restricted from moving in the axial direction in alignment with the insertion hole. . A ball screw 26 is screwed onto the ball nut 25. A conventionally known cross head 23 is attached to one end of the ball screw 26. The ball nut 25 is rotationally driven in a predetermined direction by a movable plate forward / backward servomotor 17 via a belt 18 and a pulley 24. Therefore, when the ball screw 26 is rotationally driven in a predetermined direction by the movable plate forward / backward servomotor 17, the cross head 23 is driven in the predetermined direction, and the movable platen 12 is moved in the mold closing direction (right direction on the paper surface) or the mold opening direction (left surface on the paper surface) Direction).

  A fixed-side mold 31b is attached to the fixed platen 11 via a fixed-plate side adapter plate 30b and a coupling portion 32b. A movable side mold 31a is attached to the movable platen 12 so as to oppose the fixed side mold 31b via the movable platen side adapter plate 30a and the coupling portion 32a. The fixed platen 11, movable platen 12, and adapter plate 30 (fixed platen side adapter plate 30b, movable platen side adapter plate 30a) are provided with pipes 33, 33,. It has been. The configuration of the adapter plate 30 (fixed platen side adapter plate 30b, movable platen side adapter plate 30a) will be described later with reference to FIG. The coupling portion 32a and the coupling portion 32b are collectively referred to as a coupling portion 32.

  Molten resin is injected into cavities formed in the parting surfaces of the movable mold 31a and the fixed mold 31b. Then, after the mold is opened, the molded product is ejected from the movable mold 31a by a projecting rod (not shown) which is projected into the movable mold 31a by driving the projecting ball screw 21. The rotational drive of the molded product ejecting servomotor 19 is transmitted to the ejecting ball screw 21 via the belt 20.

  FIG. 2 is a diagram illustrating the adapter plate used in the embodiment of the present invention. The movable platen side adapter plate 30a is a flat plate member that has a movable side mold 31a attached to one side surface thereof and is attached to the movable platen 12 via the coupling portion 32a on the other side surface. The fixed platen side adapter plate 30b is a flat plate-like member that has a fixed die 31b attached to one side surface thereof and is attached to the fixed platen 11 via the coupling portion 32b on the other side surface. Since the movable platen side adapter plate 30a and the fixed platen side adapter plate 30b have the same configuration, the movable platen side adapter plate 30a will be described with reference to FIG.

  A coupling portion 32a having an area smaller than the area of the movable side mold 31a attached to the other side surface is provided at the center of one side surface attached to the movable platen 12 of the movable plate side adapter plate 30a. The coupling part 32a is a part formed in a trapezoidal shape by scraping the surface of the movable platen adapter plate 30a on which the coupling part 32a is provided to a predetermined thickness.

  The movable platen side adapter plate 30a is attached to the movable platen 12 only at the center by way of the coupling portion 32a formed in a trapezoidal shape, so that the contact area between the movable platen side adapter plate 30a and the movable platen 12 is reached. And the movable platen 12 becomes less susceptible to the influence of heat from the movable mold 31a. In addition, the movable platen side adapter plate 30a has an effect of improving the problem of the uneven load on the movable side die 31a due to the deformation of the movable platen 12 when the mold clamping force is generated. In place of the table-shaped coupling portion 32a formed on the movable platen-side adapter plate 30a (that is, the table-shaped coupling portion 32a is not formed on the movable platen-side adapter plate 30a), the transmission from the movable-side mold 31a is performed. In order to suppress heat, a plate-shaped shim may be sandwiched between the movable platen side adapter plate 30a and the movable platen 12, and it is effective to use a material having low thermal conductivity for the shim. The shim is a flat member having an area smaller than the mounting surface of the mold, like the coupling portion 32a. In addition, in order to suppress the influence of heat transfer to the movable platen 12, a pipe may be formed around the coupling portion region 34 a of the movable platen 12.

  Although the movable platen side adapter plate 30a can suppress the amount of heat transmitted to the movable platen 12 by being coupled to the movable platen 12 in an area smaller than the movable side mold 31a, it is difficult to eliminate the heat transfer. Thus, the temperature distribution of the movable mold 31a becomes non-uniform due to heat transfer from the movable mold 31a to the movable panel 12 through the joint area 34a of the movable panel adapter plate 30a with the movable plate 12. there is a possibility. Therefore, in the embodiment of the present invention, as shown in the pipe 33a outside the joint area and the pipe 33b in the joint area, at least the adapter plate in the joint area between the movable platen-side adapter plate 30a and the movable board 12 is used. By providing the pipe in 30b, the temperature of the inside of the joint portion 34a, which is a place where the heat of the movable mold 31a is transmitted to the movable platen 12, can be adjusted (temperature control). The temperature distribution of the mold 31a can be made uniform.

  The adapter plate 30 (movable platen-side adapter plate 30a, fixed platen-side adapter plate 30b) may be attached to only one of the movable platen 12 or the fixed platen 11, and both the movable platen 12 and the fixed platen 11 are attached. It may be attached.

  As described above, in the embodiment of the present invention, the temperature-adjusted adapter plate (fixed platen-side adapter plate, movable platen-side adapter plate) is placed on the entire mold mounting surface of the platen (fixed platen 11, movable platen 12). Compared to the case of close contact or direct temperature control, the area where the temperature rises is limited, so the amount of heat transmitted to the mold is reduced and the heat dissipation area is large, so the temperature rise of the mold is suppressed. Therefore, deformation of the platen can also be suppressed. Also, by providing temperature control at least in the area where the adapter plate and the mold plate are combined, the temperature in the bonding area where the heat of the mold is transmitted to the mold plate can be controlled. Can be made uniform in temperature distribution. Furthermore, the influence of the heat transfer to the pattern board can be suppressed by forming a pipe in the pattern board around the bonding area of the pattern board.

DESCRIPTION OF SYMBOLS 10 Clamping apparatus 11 Fixed platen 12 Movable platen 13 Clamping platen 14 Tie bar 15 Mold thickness adjusting nut 16 Mold thickness adjusting servo motor 17 Movable plate moving servo motor 18 Belt 19 Servo motor 20 for ejecting molded product 20 Belt 21 Extruding Ball screw 22 Toggle link mechanism 23 Cross head 24 Pulley 25 Ball nut 26 Ball screw 27 Tyba insertion hole

30 Adapter plate 30a Movable platen side adapter plate 30b Fixed platen side adapter plate

31 mold 31a movable mold 31b fixed mold

32 coupling portion 32a movable side coupling portion 32b fixed side coupling portion 33 piping 33a piping outside coupling region 33b piping within coupling region 34a coupling region

The invention according to claim 1 of the present application is an injection molding machine having an adapter plate for attaching a mold to a mold board, wherein the adapter plate has a surface to be attached to the mold board and a surface to be attached to the mold, The adapter plate is coupled to the mold plate at a central portion, and has a coupling portion having an area smaller than an area of the mounting surface of the mold on a surface to be attached to the mold plate, and at least in a region provided with the coupling portion. An injection molding machine having an adapter plate, wherein the adapter plate has a pipe in the corresponding adapter plate.
The invention according to claim 2 is an injection molding machine having an adapter plate for attaching a mold to a mold platen, wherein the adapter plate has a surface to be attached to the mold platen and a surface to be attached to the die. The plate is attached to the surface of the mold plate via a shim that is smaller than the area of the mounting surface of the mold, and the adapter has piping in at least the area of the adapter plate that the shim contacts. An injection molding machine having an adapter plate characterized by the above.
The invention according to claim 3 is the injection molding machine having the adapter plate according to any one of claims 1 and 2, characterized in that a pipe is formed around the connecting portion of the mold platen.

Claims (3)

In an injection molding machine having an adapter plate for attaching a mold to a mold platen,
The adapter plate has a surface to be attached to the mold plate and a surface to be attached to the die, and has a coupling portion having an area smaller than an area of the mold attachment surface on the surface to be attached to the die plate, and at least the coupling An injection molding machine having an adapter plate, wherein a pipe is provided in the adapter plate corresponding to a region provided with a portion. In an injection molding machine having an adapter plate for attaching a mold to a mold platen,
The adapter plate has a surface to be attached to the mold platen and a surface to be attached to the mold.
The adapter plate is attached to the mold plate via a shim smaller than the area of the mold mounting surface on the surface to be mounted on the mold plate,
An injection molding machine having an adapter plate, wherein the adapter plate has a pipe at least in a region of the adapter plate with which the shim contacts.   The injection molding machine having an adapter plate according to any one of claims 1 and 2, wherein piping is formed around a joint portion of the mold platen.

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