JP2844052B2 - Injection mold with pressurized or pressurized cutting members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold capable of performing a cutting process such as pressurization or gate cutting by partially applying vibration during cooling of a resin injected and filled into a cavity in the mold. Things.

[0002]

BACKGROUND OF THE INVENTION cavity vibrated about the vibration frequency to the injection filled resin is 10H _z partially punching and gate cutting, partial compression, can be subjected to various processing such as improvement of flow properties Injection molds are already known.

In this conventional injection mold, a required number of vibrating pins whose front ends face the cavities in the mold are fixed to the front of a movable mold arranged to be openable and closable with respect to a fixed mold. The plate is accommodated, the vibrating plate abuts against a vibrating rod provided in a hydraulically operated vibration generating device, vibrates back and forth with a return spring as a reaction force, and the resin in the mold is partially processed by vibrating pins. Consists of a configuration.

[0004]

In a normal injection mold, a protruding pin for releasing a molded product after opening the mold is indispensable. Since the protruding pins protrude from the protruding plate, the vibrating plate is housed in the movable mold in addition to the protruding plate in the mold having the vibrating means. For this reason, the internal structure is likely to be complicated as compared with a normal injection mold, for example, a space for moving both plates is required, and it is necessary to assemble them so as not to interfere with each other.

The present invention has been conceived in order to solve the above-mentioned problem. The object of the present invention is to provide both a vibrating plate and a protruding plate by using a vibrating plate without using a protruding plate. It is another object of the present invention to provide an injection mold having a new configuration that can reduce the size and cost of the mold by using the same.

[0006]

SUMMARY OF THE INVENTION The present invention according to the above object comprises a fixed die attached to a fixed plate of a molding machine and a movable die attached to a movable plate movable with respect to the fixed plate. A vibrating member that partially pressurizes or cuts the resin in the cavity protrudes from the vibrating plate and is housed inside, and the vibrating rod can penetrate the mold mounting plate and contact the vibrating plate. In the injection mold thus constructed, a projecting pin provided with a flange at the rear end of the vibrating plate is inserted into the recess formed in the rear portion of the vibrating plate, by accommodating the flange, and a required space from the flange. The locking edge is fixed to the vibrating plate and protrudes into the rear recess separated by a distance, while the rear end of the protruding pin is supported by the supporting member protruding from the inner surface of the mold mounting plate, and the front end of the protruding pin is vibrated. Face the cavity with the tip of the member Made are those that, further, the vibrating member tip is formed into a tubular to face the cavity center portion, and also those that internally comprises the projecting pin freely movable relative.

[0007]

[Operation] In the above configuration, the vibration received by the vibrating plate via the vibrating rod is directly transmitted to the vibrating member, but is not transmitted to the protruding member by the rear space, and only the vibrating member is transmitted. The resin is vibrated in the axial direction to excite the resin in the portion in contact with the tip, and processing such as gate cutting, punching, or compression is performed.

When the vibrating rod is moved forward after the mold is opened, the vibrating plate also moves forward and the space is reduced, and the locking edge comes into contact with the flange. Move forward. As a result, the molded product protrudes from the half of the cavity and is released.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawing, reference numeral 1 denotes a mold, which comprises a fixed die 11 mounted on a fixed plate 2 of a molding machine with a die mounting plate 21 and a movable die 12 mounted on a movable plate 3 with a die mounted plate 31. The cavity 13 is formed by closing the mold.

The protruding pin 4 and the vibrating member 5 are inserted inside the movable mold 12 so as to be movable in the axial direction with their ends facing the cavity 13. Movable mold 1
The rear portion 2 is formed in an empty space, in which a vibration plate 6 is provided so as to be able to move forward and backward by providing a return spring 7, and the projecting pin 4 and the vibration member 5 are attached to the vibration plate 6. is there.

Although not shown in the drawing, the vibration plate 6 is formed by stacking a front plate 61 and a rear plate 62 with a cross shape in front and integrally sewing them with bolts or the like. A through hole for the tubular vibration member 5 is provided at the center intersection of the front plate 61, and a through hole for the projecting pin 4 is provided at both ends. Further, in the rear plate 62, a concave portion 63 opened on the rear surface of the plate is formed concentrically at each position of the central portion and the through hole,
At the center of each recess 63, an inner hole of the vibration member 5 or an extension hole of the above-mentioned insertion hole is formed.

The projecting pin 4 and the vibrating member 5 have flanges 41 and 51 integrally at the rear ends, respectively.
The flange 51 is sandwiched and fixed between the front plate 61 and the rear plate 62 and protrudes from the front surface of the excitation plate 6. The protruding pin 4 is inserted from the recess 63 into a through hole or a vibrating member to receive the flange 41 in the recess 63, and has a smaller diameter than the flange 41, and
The support plate 32 is supported by a support member 32 protruding from the inner surface of the vibration plate 1 and movably protrudes from the front surface of the vibration plate 6 or into the vibration member.

On the rear surface of the rear plate 62, a locking plate 64 for moving the projecting pin 4 forward together with the vibration plate 6 through the flange 41 is provided by using a screw (not shown) or the like. . This locking plate 64
In each of the positions of the recesses 63, an opening having a diameter smaller than that of the recess but larger than that of the support member 32 is formed, and the periphery of the opening is separated from the flange 41 by a required space. The engaging edge 65 is formed so as to protrude rearward and engage the flange 41 to move the protruding pin 4 forward with the vibration plate 6.

A vibrating rod 8 penetrates the back of the vibrating plate 6 through the mold mounting plate 31, the movable platen 3, and the like. Although not shown in the figure, the vibration rod 8 is connected to a vibration shaft of a vibration generating device using a hydraulic cylinder, and a hydraulic circuit of the vibration generating device is provided with a proportional flow valve and a servo valve. The shaft moves back and forth to generate vibration, and the forward position can be controlled.

In the injection mold 1 having the above configuration, the vibrating rod 8
The vibration received by the vibration plate 6 through the vibrating member 5
However, the vibration is not transmitted to the protruding pin 4 due to the space behind the flange 41 housed in the recess 63, and only the vibrating member 5 vibrates in the axial direction and the cavity 13 is injected and filled. The resin is advanced while partially exciting the used resin by the tip.

As a result, the center of the molded product 9 molded by the cavity 13 is punched out by the tubular vibrating member 5 into a circle, and the sprue 91 is cut as shown in FIG.

When the vibrating rod 8 is further moved forward after the mold is opened, the vibrating plate 6 moves forward together with the vibrating member 5 to reduce the space, and the locking edge 65 comes into contact with the flange 41. As a result, the projecting pin 4 also moves forward together with the vibration plate 6, and the central projecting pin 4
1, and the projecting pins 4 on both sides project the molded product 9 from the half of the cavity, and release the molded product 9 from the mold as shown in FIG.

When the oscillating rod 8 is moved backward after the release, the oscillating plate 6 is pushed back to the original position by the return spring 7, and the projecting pin 4 is supported by the support member 32 to prepare for the next projecting.

The embodiment shown in FIG. 4 is a case where the gate 14 in the cavity is cut by the vibrating member.
The pins are vibrated together with the vibrating plate 6 to perform gate cutting.

Although the description of the embodiment has been omitted,
Even when the resin in the cavity is partially pressed and compressed by the vibrating member or when the molten resin is vibrated to improve the fluidity, the arrangement of the protruding member and the vibrating member is set as appropriate. The present invention is not limited to the injection mold that performs the pressure cutting, since it is only necessary to perform the configuration change.

[0021]

As described above, according to the present invention, since the projecting pins are attached to the exciting plate together with the exciting member, the projecting plate is not required, and the moving space for the exciting plate can be simply provided in the movable mold. Therefore, the size can be reduced in combination with the simplification of the mold, and the cost of the mold is reduced. Furthermore, since the vibrating plate is also used as the protruding plate, it is possible to omit the protruding device provided in the conventional mold by using the vibrating device for protruding, and to apply the present invention to an existing die. Have.

Also, a protruding pin provided with a flange at the rear end,
The flange is housed and inserted into a recess formed in the rear portion of the vibration plate, and a locking edge is fixedly protruded from the flange in a rear space separated by a required space from the flange. The rear end of the protruding pin is supported by a support member protruding from the inner surface of the mold mounting plate, and the front end of the protruding pin faces the cavity together with the front end of the vibrating member. There is such a feature that the pin is not operated and the two operations of the vibration and the projection can always be reliably performed with the vibration plate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an injection mold according to the present invention when the mold is closed.

FIG. 2 is a cross-sectional view when a molded product is punched.

FIG. 3 is a cross-sectional view when the molded product is released from the mold.

FIG. 4 is a sectional view of another embodiment of the present invention when the mold is closed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 injection mold 2 fixed plate 3 movable plate 4 projecting pin 5 vibrating member 6 vibrating plate 7 return spring 8 vibrating rod 9 molded product 11 fixed die 12 movable die 13 cavity 14 gate 21 fixed die mounting plate 31 movable Mold mounting plate 32 Support member 41 Protruding pin flange 51 Vibration member flange 61 Front plate 62 Rear plate 63 Recess 65 Retaining edge

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-47569 (JP, A) JP-A-7-47576 (JP, A) JP-A-6-114899 (JP, A) JP-A-5-47 329896 (JP, A) Japanese Utility Model Hei 4-5919 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45/26-45/44 B29C 33/00-33/76 WPI (DIALOG)

Claims (2)

(57) [Claims] 1. A fixed mold attached to a fixed board of a molding machine, and a movable mold attached to a movable board movable with respect to the fixed board, and the resin in the cavity is partially pressurized or applied to the movable mold. In an injection mold, a vibrating member to be cut under pressure is provided protrudingly from a vibrating plate, and a vibrating rod is configured to be able to penetrate the vibrating plate through a mold mounting plate so as to be in contact therewith. A projection pin provided with a flange at the rear end thereof is inserted into the recess formed in the rear portion of the vibration plate by receiving the flange and inserting a locking edge into a rear recess separated by a required space from the flange. Is fixed to the vibration plate and protruded, while the rear end of the protruding pin is supported by a support member protruding from the inner surface of the mold mounting plate, and the front end of the protruding pin faces the cavity together with the front end of the vibration member. Characterized by pressure or pressure cutting Injection mold, which was decorated with wood. 2. The pressurizing or pressurizing device according to claim 1, wherein the vibrating member is tubular, and a tip thereof faces a central portion of the cavity, and the protruding pin is relatively movably provided therein. An injection mold with a cutting member inside.