JP3345875B2 - Gate cut drive unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate cut drive unit used when, for example, a recording disk is injection-molded with resin.

[0002]

For example, in the formation of a mini disc as a recording disc, for example,
As described in Japanese Patent Application Laid-Open No. 2-45809, a mini-disc-shaped cavity formed between a fixed die and a movable die of a mold is located at a position corresponding to a peripheral portion of a central hole of the mini-disc. After filling the resin as a molding material from the gate, the gate cutter is operated to cut the resin at the gate portion. In the publication described above, the gate cutter is driven by a driving device such as a hydraulic cylinder incorporated in the movable die itself.

However, incorporating a gate cutter driving device for each mold as described above increases the cost. Recently, a gate such as a hydraulic cylinder is provided not on the mold but on a movable platen of a molding machine to which the movable mold is attached. A driving device for a cutter has been incorporated, and a driving device for a gate cutter has been commonly used for a plurality of dies. However, in this case, there is a problem that the mold cannot be used on a molding machine without a gate cutter because the mold does not have a gate cutter driving device.

An object of the present invention is to solve such a problem, and an object of the present invention is to enable a molding machine without a gate cutter driving device to use a mold without a gate cutter driving device. .

[0005]

According to the first aspect of the present invention, there is provided a gate cutter for cutting a molding material at a gate portion from a molding material passage into a product-shaped cavity in a mold body. A gate cut drive unit for driving, comprising: a joint plate detachably mounted between a platen of a molding machine and a mold body; and a gate cut built in the joint plate to drive a gate cutter in the mold body. And a hydraulic cylinder for the mold
In said cavity or molding material passage provided in the body
The molding is carried out to a protruding pin for releasing the solidified molding material from the mold.
Power from the protruding member provided on the platen of the
Built-in protruding power transmission pin is built into the joint plate
And the projecting power transmission pin is
Slidably penetrates the piston of the hydraulic cylinder for
In both cases, make sure that the tip abuts the ejection pin
It is provided in .

When a mold without a gate cutter driving device is used in a molding machine without a gate cutter driving device,
The joint plate of the gate cut drive unit is mounted between the platen of the molding machine and the mold body. Then, at the time of molding, after the molding material is filled into the cavity from the resin passage through the gate in the mold body, the gate cutter in the mold body is driven by the drive source in the joint plate, and the gate cutter The molding material of the gate portion is cut. When the mold is opened, the platen of the molding machine
The power from the protruding member provided at the
The power transmission member in the joint plate of the drive unit
It is transmitted to the protruding member in the mold body,
The mold material solidified in the mold material passage is released.

According to a second aspect of the present invention, in the gate cut drive unit according to the first aspect of the present invention, a temperature control fluid passage is formed in the joint plate.

[0008] The temperature of the joint plate can be adjusted by flowing a temperature adjusting fluid such as water through the temperature adjusting fluid passage in the joint plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gate cut drive unit according to the present invention will be described below with reference to the drawings. First, the configuration of the molding machine and the mold will be described. The mold according to the present embodiment is configured to injection-mold a recording disk such as a mini disk with a thermoplastic resin. As shown in FIG. 1, the molding machine has a fixed platen 1 and a movable platen 2, and these platens 1 and 2 are connected by a plurality of tie bars 3. The tie bars 3 have one ends fixed to the fixed platen 1 and penetrate the movable platen 2 slidably. The movable platen 2 approaches and separates from the fixed platen 1 by driving a hydraulic cylinder or an electric motor (not shown). Further, the movable-side platen 2 has a protruding rod 6 and a compression rod 7 which are protruding members that move in the moving direction (mold opening and closing direction) with respect to the movable-side platen 2.
Are provided in a penetrating state. The protruding rod 6 is driven by a protruding hydraulic cylinder 8, and the compression rod 7 is driven by a compression hydraulic cylinder 9.

The mold includes a fixed mold 12 and a movable mold 13 which form a mold body 11. The fixed mold 12 is detachably attached to the fixed platen 1,
The movable mold 13 is detachably attached to the movable platen 2 via a gate cut drive unit 14 described in detail later. The movable mold 13 opens and closes with respect to the fixed mold 12 with the movement of the movable platen 2, and a cavity 15 in the shape of a product disk is provided between the fixed mold 12 and the movable mold 13 with the mold closed. Is formed.

The fixed die 12 has a fixed mounting plate 21 mounted on the fixed platen 1. A fixed die plate 22 is provided on the left surface of the fixed mounting plate 21, that is, on the movable die 13 side. Are fixed to the peripheral portion, and the cavity block 23 located in the fixed side template 22 is fixed. Further, a sprue bush 24 is fixed through the fixed-side mounting plate 21 and the cavity block 23, and the inside of the sprue bush 24 is a sprue 25 which is a molding material passage. At the same time, a locate ring 26 is fixed to the right side of the fixed side mounting plate 21 surrounding the sprue bush 24. A thin disk-shaped stamper 27 is detachably attached to the left surface of the cavity block 23 forming the cavity 15. And this stamper 27 is a sprue bush
The inner periphery is held down from the left side by an inner stamper holder 28 detachably fixed to the left end of 24, and the outer periphery is held down from the left side by an outer stamper holder 29 fixed to the left side periphery of the cavity block 23. .

On the other hand, the movable mold 13 has a movable mounting plate 31 which is mounted on the movable platen of the gate cut drive unit 14 or another type of molding machine (not shown). A frame-shaped movable mold plate 32 is fixed to the right side of 31, that is, the fixed mold 12 side. An annular frame 33 that abuts against the fixed-side mold plate 22 of the fixed mold 12 is fixed to a distal end portion of the movable-side mold plate 32. This frame 33 forms the outer peripheral surface of the disk.

The movable-side mounting plate in the form of a frame.
A first movable base 36 is disposed inside 31, and a second movable base 36 fixed to the first movable base 36 is provided inside the movable mold plate 32.
Movable base 37 is arranged. Further, the core block 38 fixed to the right surface of the second movable base 37 is
It is slidably fitted in 33. The movable bases 36 and 37 and the core block 38 are attached to the movable side mounting plate 3.
1.The movable mold plate 32 and the frame 33 are movable in a predetermined range in the mold opening and closing direction with respect to the frame 33, and are urged by the spring 39 in a direction away from the fixed mold 12 with respect to the movable mold plate 32. ing.

A protruding sleeve 41 as a protruding member is incorporated inside the second movable base 37 and the core block 38 so as to be movable within a predetermined range in the mold opening and closing direction. The protruding sleeve 41 has a distal end facing the inner peripheral portion of the cavity 15. And
The protruding sleeve 41 is urged by a spring 42 in a direction away from the fixed mold 12 with respect to the second movable base 37.

Further, a cylindrical gate cutter 43 is incorporated in the first movable base 36 so as to be movable within a predetermined range in the mold opening and closing direction. The gate cutter 43 slidably penetrates through the protruding sleeve 41, and has a tip located opposite the sprue bush 24. In addition,
The tip of the sprue bush 24 has a gate cutter
A concave portion 44 is formed in which the distal end portion of 43 is removably fitted. The gate cutter 43 is urged by the spring 45 in a direction away from the fixed mold 12 with respect to the protruding sleeve 41.

Further, a protruding pin 46 as a protruding member is slidably incorporated in the gate cutter 43 in the mold opening and closing direction. The tip of the protruding pin 46 is opposed to the sprue 25, and is urged by a spring 47 in a direction away from the fixed die 12 with respect to the gate cutter 43. An interlocking piece 48 is formed on the protruding pin 46 so as to abut on the end face of the protruding sleeve 41 from the side opposite to the fixed die 12.

Then, in a mold closed state, and with the gate cutter 43 moved to the opposite side to the fixed mold 12, a disc-shaped disc communicating with the sprue 25 is provided between the opposing end faces of the sprue bush 24 and the gate cutter 43. A runner 51 serving as a molding material passage and a ring-shaped gate 52 communicating from the runner 51 to the cavity 15 are formed.

Next, the gate cut drive unit 14
Will be described in detail with reference to FIGS. 3 and 4. Reference numeral 61 denotes a substantially flat joint plate. The joint plate 61 is detachably mounted between the movable platen 2 and the movable mounting plate 31 of the mold body 11. For this purpose, screw holes 62 are formed in the four corners of the joint plate 61 on the movable side mounting plate 31 side. Notches 63 are formed on both sides of the joint plate 61 on the movable mounting plate 31 side, and through holes 64 are formed at both ends of the notches 63, respectively. On the other hand, screw holes 62 are provided at the four corners of the movable side mounting plate 31.
There is a through hole 65 corresponding to each, and a bolt 66 inserted into these through holes 65 is screwed into the screw hole 62, so that the joint plate 61 is fixed to the movable side mounting plate 31. . At four corners of the movable platen 2, there are screw holes 67 corresponding to the through holes 64, respectively. Bolts 68 inserted into the through holes 64 are screwed into the screw holes 67, so that the movable platen 2 The joint plate 61 is fixed to the arm. In addition, the movable side mounting plate 31 is attached to the movable side platen.
If there is a screw hole corresponding to the through hole 65, the movable-side mounting plate 31 can be directly attached to the movable-side platen without the intervention of the gate cut drive unit 14.

In the center of the joint plate 61, a through hole is provided.
A compression power transmission cylinder 72 is slidably fitted in the through hole 70 via an intermediate cylinder 71 in the mold opening and closing direction. On the movable side platen 2 side in the through hole 70,
A receiving surface 73 is formed by counterbore. A flange 74 facing the receiving surface 73 is formed in the compression power transmission cylinder 72. A holding plate 75 for holding the flange 74 of the compression power transmission tube 72 from the movable platen 2 side is fixed to the joint plate 61. The range of movement of the compression power transmission cylinder 72 is regulated by the flange 74, the receiving surface 73 of the joint plate 61, and the pressing plate 75.

A hydraulic cylinder 81 for gate cutting, which is a driving source for driving the gate cutter 43, is incorporated in the power transmission cylinder 72 for compression. The hydraulic cylinder 81 is provided in a cylinder chamber 84 formed by an inner peripheral surface of a compression power transmission cylinder 72 and a pair of end face plates 82 and 83 fixed to the compression power transmission cylinder 72 in a mold opening and closing direction. It has a built-in piston 85 that moves within a predetermined range and pushes the gate cutter 43. The compression power transmission cylinder 72 has a pair of oil inlets and outlets 86 communicating with both ends of the cylinder chamber 84, respectively.
A coupling pipe 88, 89 connected to a hydraulic drive circuit (not shown) is connected to the oil ports 86, 87, respectively. These joint pipes 88 and 89 pass through through holes 90 formed in the joint plate 61.

The gate cut drive unit 14 includes:
A protruding power transmitting pin 91 which is a protruding power transmitting member for transmitting the power from the protruding rod 6 of the movable platen 2 to the protruding pin 46 of the movable mold 12 is incorporated. More specifically, a cylindrical end plate presser 92 is provided on the inner side of the compression power transmission cylinder 72 on the movable platen 2 side.
Is fixed, and a flange 93 formed at one end of the protruding power transmission pin 91 is slidably fitted in the end face plate retainer 92. Then, the projecting power transmission pin 91
Is slidably penetrated through the cylindrical piston 85, and the front end thereof comes into contact with the protruding pin 46. The projecting power transmission pin 91 is urged toward the movable platen 2 by a spring 94 mounted between the flange 93 and the end face plate 83.

Further, in the joint plate 61, a temperature control fluid passage 96 surrounding the through hole 70 is formed in two stages. Both ends of the two temperature control fluid passages 96 are opened as connection ports 97 to the side surfaces of the joint plate 61 at the notch portions 63. A temperature control circuit (not shown) is connected to the connection port 97.

Next, the operation of the above configuration will be described. Although the mold body 11 does not have a drive source for the gate cutter 61, if the mold body 11 is used in a molding machine without a drive source for the gate cutter 61, the movable platen 2 of the molding machine and the mold The gate cut drive unit 14 is mounted between the main body 11 and the movable mounting plate 31.

At the time of molding, the fixed mold 12 and the movable mold 13 are first closed as shown in FIG. 1, but at this stage, as shown by a chain line in FIG. The piston 85 of the gate-cut hydraulic cylinder 81 has been moved to the movable platen 2 side. Therefore, the gate cutter 43 is also moved to the movable platen 2 side by the force of the spring 45, and the gate 52 is open. Further, the compression rod 7 of the compression hydraulic cylinder 9 is also in a retracted state, so that the spring 39
The movable bases 36 and 37 of the mold main body 11, the core block 38, and the compression power transmission cylinder 72 of the gate cut drive unit 14 are also moved to the movable platen 2 side by the force of. Further, the protruding rod 6 of the protruding hydraulic cylinder 8 is also in a retracted state, and accordingly, the protruding power transmission pin 91 of the gate cut drive unit 14, the protruding sleeve 41 and the protruding pin 46 of the mold body 11, and the spring 94, respectively. It has been moved to the movable platen 2 side by the forces of 42 and 47.

In this state, a molten thermoplastic resin as a molding material is injected into the sprue 25 from a nozzle of a molding machine (not shown). This resin is runner from sprue 25
The cavity 15 is filled through the gate 51 and the gate 52. Thereafter, as shown by the solid line in FIG. 2, the piston 85 of the hydraulic cylinder 81 for gate cutting moves forward toward the movable-side mounting plate 31, and the gate cutter is pressed against the force of the spring 45.
Push 43 toward fixed mold 12 to move it. As a result, the tip of the gate cutter 43 is
And the resin at the gate 53 is cut off.

Next, the compression rod 7 moves forward by the driving of the compression hydraulic cylinder 9, and is pushed by the compression rod 7 to move the compression power transmission cylinder 72 in the gate cut drive unit 14. Power transmission tube 72
As a result, the movable bases 36 and 37 and the core block 38 also move toward the fixed mold 12. Thereby, the resin in the cavity 15 is compressed.

Further, after the resin in the cavity 15, the sprue 25 and the runner 51 is sufficiently cooled and solidified, the fixed mold 12 and the movable mold 13 are opened. Accordingly, the resin solidified in the cavity 15, ie, the disk 101 and the sprue
25 and the resin 102 solidified in the runner 51 are first separated from the fixed mold 12. Thereafter, the protruding rod 6 is moved forward by the driving of the protruding hydraulic cylinder 8, and is pushed by the protruding rod 6 so that the gate cut drive unit 14 is driven.
The projecting power transmission pin 91 inside also moves against the force of the spring 94. Then, being pushed by the projecting power transmission pin 91, the projecting pin 46 moves toward the fixed mold 12, and the resin 102 solidified in the sprue 25 and the runner 51 is ejected and released from the movable mold 13. Also, push out pin 46
Is moved to some extent, the interlocking piece 48
Pushes the protruding sleeve 41, and the protruding sleeve 41 moves toward the fixed die 12 to protrude the molded disk 101 and release it from the movable die 13.

Thereafter, the mold is closed again, and the above-described molding steps are repeated. In this molding, fixed mold
By passing a temperature control fluid such as water through a temperature control fluid passage (not shown) provided in the 12 and the movable mold 13, the fixed mold 12 and the movable mold 13 are cooled, and cooling of the resin is promoted. You. Along with this, the gate cut drive unit
A temperature control fluid such as water is also passed through the temperature control fluid passage 96 in the 14 joint plates 61, whereby the joint plates 61 are cooled. Thereby, the cooling efficiency of the mold body 11 is also increased, and good and efficient molding can be performed.

As described above, the gate cutter 43 is provided by the gate cut drive unit 14 which incorporates the gate cut hydraulic cylinder 81 and is detachably mounted between the movable mold 13 of the mold body 11 and the movable platen 2. The mold body 11 without the driving device of the gate cutter 43 can be used in the molding machine without the driving device. In other words, even if the mold body 11 is originally intended for a molding machine provided with a drive device for the gate cutter 43 on the movable platen, the mold body 11 can be used for a molding machine without a drive device for the gate cutter 43. You can use it. Also, the gate cut drive unit 14
For example, since it can be shared by a plurality of mold bodies 11 for molding different disks, the cost can be reduced as compared with a case where a gate cutter driving device is incorporated in each mold.

Further, since the projecting power transmission pin 91 is incorporated in the gate cut drive unit 14, the projecting of the resin using the projecting hydraulic cylinder 8 on the molding machine side can be performed without any trouble.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example,
In the above-described embodiment, the injection compression molding of the recording disk has been described as an example. However, the present invention can be applied to the molding of products other than the recording disk, and can be applied to molding methods other than the injection compression molding. Further, in the above embodiment, the drive source of the gate cutter 43 is the hydraulic cylinder 81, but the drive source is not limited to the hydraulic cylinder. However, the hydraulic cylinder has an advantage that the configuration of the drive source can be simplified and the gate cutter can be reliably operated.

[0032]

According to the first aspect of the present invention, there is provided a gate cut drive unit, which has a shape of a product from a molding material passage in a mold body.
Gate cut to cut the molding material of the gate part to the bitty
A gate cut drive unit that drives the
Removably mounted between the platen of the machine and the mold body
Fitting plate and the built-in fitting plate
Gate cut that drives the gate cutter inside the die body
And a hydraulic cylinder, provided in the mold body.
Molded material solidified in the cavity or molding material passage
To the platen of the molding machine
Projection that transmits power from the provided projecting member
A power transmission pin is built in the joint plate, and
The power transmission pin is the hydraulic cylinder for gate cut
Slidably penetrates through the piston of
Since the end was provided so as to hit the protruding pin ,
A molding machine without a gate cutter drive can be used on a molding machine without a gate cutter drive. With this,
The gate cut drive unit can be shared for a plurality of mold bodies, and the cost can be reduced. In addition, the molding machine
The power from the protruding member provided on the ten
Fitting the projecting power transmission pin for transmitting to the ejector pin
Uses the protruding member of the molding machine because it is built into the plate
The molding material can be projected without any trouble.

According to the gate cut drive unit of the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the temperature control fluid passage is formed in the joint plate, the temperature of the joint plate can also be controlled. This allows good molding.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a gate cut drive unit according to the present invention in a used state.

FIG. 2 is a partial cross-sectional view when the gate is cut.

FIG. 3 is a front view of the same gate cut drive unit.

FIG. 4 is a side view of the gate cut drive unit.

[Explanation of symbols]

2 movable platen (platen) 6 ejector rod (ejection member) 11 die body 14 gate cutting drive unit 15 cavity 25 sprue (molding material passage) 41 projecting sleeve (ejection member) 43 gate cutters 46 protruding pin 51 runners (molding material passage) 52 gate 61 joint plate 81 the hydraulic cylinder over 85 piston 91 protrudes power transmission pin fluid passage 96 temperature control

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/26-45/44 B29C 33/00-33/76

Claims (2)

(57) [Claims] 1. A gate cut drive unit for driving a gate cutter for cutting a molding material at a gate portion from a molding material passage into a product-shaped cavity in a molding body, the platen of the molding machine and the molding body. A coupling plate removably mounted between the coupling plate and a gate built in the coupling plate for driving a gate cutter in the mold body
And a hydraulic cylinder for cutting, set in the mold body
Solidified in the cavity or molding material passage
Plug the molding machine into the protruding pin that releases the molding material.
Projection for transmitting power from the projecting member provided on the ten
A built-in power transmission pin in the joint plate, and
The projecting power transmission pin is connected to the gate cut hydraulic system.
While slidably penetrating through the piston of the cylinder,
A gate cut drive unit, wherein a tip of the gate cut drive unit is provided so as to abut the protrusion pin . 2. A gate cut drive unit of claim 1 Symbol mounting, characterized in that the formation of the fluid passage temperature control in the joint plate.