JP4181984B2 - Compression molding equipment - Google Patents

Description

  The present invention relates to a compression molding apparatus that compresses a molding material such as a resin with a mold including an upper mold and a lower mold.

  Conventionally, a compression provided with an upper mold, a lower mold disposed below the upper mold so as to be able to contact and separate from the upper mold, and a frame mold disposed so as to surround the outer periphery of the lower mold A molding apparatus is widely known (for example, refer to Patent Document 1).

  A conventionally known compression molding apparatus 1 shown in FIG. 4 includes an upper mold 3 fixed to an upper platen 2 and a lower mold fixed to a slide platen 4 that is movable up and down and capable of contacting and separating from the upper mold 3. 5 and a frame mold 6 disposed so as to surround the outer periphery of the lower mold 5.

  In this compression molding apparatus 1, a molding space 8 is formed by pushing the frame mold 6 upward from the upper surface 5 </ b> A of the lower mold 5 by a spring 7, and a molding material 9 such as a resin is formed in the molding space 8. Is to be supplied. The frame mold 6 is pushed down by the upper mold 3 when the upper mold 3 and the lower mold 5 are in contact with each other, and is pushed up by the elastic force of the spring 7 as the upper mold 3 and the lower mold 5 are separated from each other. It has become.

JP 2003-133352 A

  However, in the conventionally known compression molding apparatus 1, the frame 6 is pushed upward from the upper surface 5 </ b> A of the lower mold 5 in the mold open state, so that it protrudes, so that the release film is placed on the upper surface of the lower mold 5. It was difficult to set along 5A without slack, and as a result, the surface of the molded product could be wrinkled.

  When the mold is opened, the lower mold 5 is first separated from the upper mold 3, and then the frame mold 6 is delayed and separated from the upper mold 3. In some cases, there is a problem that a part of the molded product is peeled off.

  The present invention has been made in order to solve such problems, and can set the release film without slack, and in advance the occurrence of molding defects due to peeling of the molded product at the time of release. An object of the present invention is to provide a compression molding apparatus that can prevent the above.

The present invention includes an upper mold, a lower mold disposed below the upper mold so as to be capable of contacting and separating from the upper mold, and a frame mold disposed so as to surround the outer periphery of the lower mold. In the compression molding apparatus, the frame mold driving means for moving the frame mold up and down independently of the positional relationship between the upper mold and the lower mold is provided , and the frame mold driving means moves the frame mold relative to the lower mold. The frame mold push-up mechanism capable of pushing up the mold upward, and the frame mold push-down mechanism capable of pushing down the frame mold downward. Further, the frame mold push-down mechanism is driven by a taper cam that moves in the horizontal direction. This solves the above-mentioned problems.

  According to the compression molding apparatus according to the present invention, it is possible to set the release film without slack, and to prevent the occurrence of molding defects due to peeling of the molded product at the time of release.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a schematic front view and a schematic side view of a compression molding apparatus according to an embodiment of the present invention, respectively.

  As shown in the figure, the compression molding apparatus 10 is fixed to an upper mold 12, a slide platen 14 that is movable up and down by an upper and lower mold drive device (upper and lower mold drive means) (not shown), and the slide platen 14. The lower mold 16 that can be brought into contact with and separated from the upper mold 12, the frame mold 18 disposed so as to surround the outer periphery of the lower mold 16, and the positional relationship between the upper mold 12 and the lower mold 16. And a frame type driving device 20 which is a frame type driving means for moving up and down independently.

  A vacuum pipe hole 16 </ b> A is formed inside the lower mold 16, and the vacuum pipe hole 16 </ b> A is connected to a vacuum generator 26 installed outside via a joint 22 and a pipe 24.

  Further, the frame type driving device 20 can push down the frame mold 18 downward against an elastic force of the spring 28 (elastic body) that can push the frame mold 18 upward with respect to the lower mold 16. Frame type push-down mechanism 30.

  The frame-type push-down mechanism 30 includes two ball splines 32 disposed on both sides of the slide platen 14, a pair of taper cams 34 disposed below the two ball splines 32, and a connecting plate for connecting them. The slider 38 is mainly composed of a slider 38, a ball screw 40 that drives the slider 38 in the horizontal direction, and a servo motor 42 that rotationally drives the ball screw 40.

  The ball spline 32 has a substantially cylindrical outer cylinder 44 and a shaft 46 that can slide in the inner space of the outer cylinder 44 in the axial direction and non-rotatably in the radial direction. A hook 50 is provided at the upper end of the shaft 46 so as to contact the upper surface of the L-shaped metal fitting 48 attached to the frame 18, and between the hook 50 and the outer cylinder 44. The spring 52 that supports the axial load of the shaft 46 is contracted.

  On the other hand, a clevis 54 having an inverted U-shaped inner space in a front view is attached to the lower end of the shaft 46, and a roller follower 58 supported rotatably by a pin 56 is disposed in the inner space. It is installed. Also, in the upper space of the roller follower 58, the tip of the taper cam 34 of the slider 38 is inserted so as to contact the roller follower 58, and the clevis 54 and the shaft 46 move up and down as the slider 38 moves horizontally. It has become.

  A guide rail 60 is formed at the upper end of the taper cam 34 of the slider 38, and the slider 38 is slidably attached along a plurality of slide guides 64 provided on the slide platen 14 and the bracket 62. A nut 66 to be fitted to the ball screw 40 is fixed on the connecting plate 36 of the slider 30.

  The ball screw 40 is rotatably supported by a support block 68 provided at the lower portion of the bracket 62, and a pulley 70 is attached to one end side thereof. The pulley 70 is connected to a pulley 74 attached to the motor shaft of the servo motor 42 via a timing belt 72.

  Note that the amount of vertical movement of the hook 50 in the frame-type push-down mechanism 30 can be controlled by a control panel 76 connected to the servo motor 42.

  Next, the operation of this frame type pressing mechanism 30 will be described.

  When the pulley 74 is rotated in the X direction in the figure by the servo motor 42, this rotation is transmitted to the pulley 70 via the timing belt 72. The rotation of the pulley 70 is converted into a horizontal driving force by the ball screw 40, and the slider 38 moves in the horizontal direction B by this driving force. Then, the roller follower 58 rolls on the tip of the taper cam 34 of the slider 38, and the shaft 46 is pushed upward by the spring 52. As a result, the hook 50 rises and the frame mold 18 is pushed upward by the elastic force of the spring 28.

  On the other hand, when the pulley 74 is rotated in the Y direction in the figure, the roller follower 58 rolls in the reverse direction A at the tip of the taper cam 34 of the slider 38, and the shaft 46 is lowered downward by being pushed down by the taper cam 34. As a result, the hook 50 is lowered, and the frame mold 18 is pushed downward by the frame mold push-down mechanism 30.

  Next, the operation of the compression forming apparatus 10 will be described with reference to FIG.

  As shown in FIG. 3A, the frame mold 18 is pushed down by the frame mold push-down mechanism 30 so that the upper surface 16B of the lower mold 16 and the upper surface 18A of the frame mold 18 are flush with each other in the mold open state. Then, the release film 78 is set on the upper surface 16B of the lower mold 16 by a release film driving means (not shown).

  Next, as shown in FIG. 3B, in a state in which the release film 78 is adsorbed to the upper surface 16 </ b> B of the lower mold 16 by the vacuum generator 26, the frame mold push-down mechanism 30 is raised, and the elastic force of the spring 28. To push the frame 18 upward. Then, a molding material 80 such as resin is supplied to the molding space.

  After supplying the molding material 80, as shown in FIG. 3C, the lower mold 16 is raised by the upper and lower mold driving device, the molding material 80 is pressurized, and molding is performed.

  When the molding is completed, as shown in FIG. 3 (D), the frame mold 18 is pushed down by the frame mold push-down mechanism 30, and the frame mold 18 is separated from the molded product 82, as shown in FIG. 3 (E). Then, the frame mold push-down mechanism 30 is raised and the frame mold 18 is pushed upward by the elastic force of the spring 28.

  Finally, as shown in FIG. 3 (F), the lower mold 16 is lowered by the upper and lower mold driving device to perform mold opening. Then, the used release film 78 is peeled off from the lower mold 16 and the release film 78 is replaced.

  According to the compression molding apparatus 10 according to the present invention, since the frame mold 18 is provided with the frame mold driving device 20 (frame mold driving means) for moving up and down independently of the positional relationship between the upper mold 12 and the lower mold 16, The frame mold 18 can be moved up and down independently of the mold opening. Accordingly, the upper surface 16B of the lower mold 16 and the upper surface 18A of the frame mold 18 can be flush with each other in the mold open state, the release film can be set without slack, and the frame mold 18 can be opened when the mold is opened. By pushing down only, the frame mold 18 can be reliably separated from the molded product, and the occurrence of molding defects due to peeling of the molded product at the time of mold release can be prevented.

  In particular, the frame type driving device 20 can push down the frame mold 18 downward against an elastic force of the spring 28 (elastic body) that can push the frame mold 18 upward with respect to the lower mold 16. Therefore, a complicated mechanism for pushing the frame mold 18 upward is unnecessary, and the upper mold 12 and the frame mold 18 are brought into close contact with each other by the elastic force of the elastic body. Therefore, the molded product can be more reliably molded and released.

  The compression molding apparatus according to the present invention is not limited to the structure and shape of the compression molding apparatus 10 according to the above embodiment. For example, the ball screw 40 is arranged coaxially with the ball spline 32, and the ball screw 40 The axial driving force may be directly transmitted to the shaft 46 to drive the shaft 46 in the vertical direction.

  The “elastic body” in the present invention is not limited to a spring, and for example, rubber or the like may be applied.

  Furthermore, when the purpose is only to prevent peeling of the molded product, for example, the frame mold push-down mechanism 30 is arranged on the upper mold 12 side, and the frame mold 18 can be pushed down independently of the upper mold 12. It is good also as a structure.

  In the above embodiment, the frame type driving device 20 is constituted by the elastic body 28 and the frame type pressing mechanism 30, and the upward movement of the frame mold 18 is a natural operation (elastic force) by the elastic body 28, or the lower side. However, the present invention is not limited to this. For example, when the frame mold 18 is forcibly driven upward, the taper cam is a groove type. The roller follower may be fitted in the groove.

  That is, the compression molding apparatus according to the present invention is disposed so as to surround an upper mold, a lower mold disposed below the upper mold so as to be able to contact and separate from the upper mold, and an outer periphery of the lower mold. In the compression molding apparatus provided with the frame mold, any compression molding apparatus provided with frame mold driving means for moving the frame mold up and down independently of the positional relationship between the upper mold and the lower mold may be used.

Schematic front view of a compression molding apparatus according to an embodiment of the present invention Schematic side view of the compression molding apparatus in FIG. Schematic showing the operation of the compression molding apparatus in FIG. Schematic front view of conventional compression molding equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Compression molding apparatus 2 ... Upper platen 3,12 ... Upper mold | type 4,14 ... Slide platen 5,16 ... Lower mold | type 6,18 ... Frame type | mold 7,28,52 ... Spring 8 ... Forming space part 9,80 ... molding material 16A ... vacuum piping hole 20 ... frame type driving device 22 ... joint 24 ... piping 26 ... vacuum generating device 30 ... frame type pressing mechanism 32 ... ball spline 34 ... taper cam 36 ... coupling plate 38 ... slider 40 ... ball screw 42 ... Servo motor 44 ... Outer cylinder 46 ... Shaft 48 ... L-shaped metal fitting 50 ... Hook 54 ... Clevis 56 ... Pin 58 ... Roller follower 60 ... Guide rail 62 ... Bracket 64 ... Slide guide 66 ... Nut 68 ... Support blocks 70, 74 ... Pulley 72 ... Timing belt 76 ... Control panel 78 ... Release film 82 ... Molded product

Claims (4)

A compression molding apparatus comprising: an upper mold; a lower mold disposed below the upper mold so as to be able to contact and separate from the upper mold; and a frame mold disposed so as to surround an outer periphery of the lower mold. In
Frame type drive means for moving the frame type up and down independently of the positional relationship between the upper and lower molds ;
The frame mold driving means is constituted by a frame mold push-up mechanism capable of pushing up the frame mold upward with respect to the lower mold, and a frame mold push-down mechanism capable of pushing down the frame mold downward,
Further, the compression molding apparatus is characterized in that the frame type pressing mechanism is driven by a taper cam that moves in the horizontal direction .   In claim 1,
  The frame-type push-up mechanism is an elastic body
  A compression molding apparatus characterized by that.   In claim 2,
  The frame-type push-down mechanism is driven by the taper cam
  A compression molding apparatus characterized by that. In any one of Claims 1 thru | or 3 ,
A compression molding apparatus, wherein the frame mold pressing mechanism is arranged on the upper mold side, and the frame mold can be pressed downward as the upper mold independently.

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