JPH08112839A - Cassette mold fixing device of injection molding machine - Google Patents

Abstract

PURPOSE: To simply and certainly fix a cassette mold to a mold base without requiring a large-scale hydraulic circuit. CONSTITUTION: A fixing device is constituted of a clamping member 71 having a clamper pawl 70 engageable with the square groove 30 formed to a cassette mold 1, the coil spring 72 energizing the clamping member 71, a cylinder 76 as a press means 73 pressing the clamping member against the energizing force of the coil spring 72 and a piston 77. The clamping member 71 is energized by the coil spring 72 and the clamper pawl 70 is engaged with the square groove 30 to always pressing the cassette mold 1 to the attaching plate 38 of the mold base 5 to fix the same. When the fixing of the cassette mold is released if necessary in order to replace the cassette mold, pressure oil is supplied to the cylinder 76 to extend the piston 77 against the energizing force of the coil spring 72 and the engagement of the clamper pawl 70 with the square groove 30 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine having a detachable cassette mold, and more particularly to a fixing device for fixing the cassette mold.

[0002]

2. Description of the Related Art In order to form different cavities depending on the type of molded product, a cassette mold is detachably mounted on a mold base as disclosed in Japanese Patent Laid-Open No. 63-116829, and if necessary, a cassette is formed. Injection molding machines for changing molds are known. In this injection molding machine, square grooves as engaging portions are formed on the upper surface and the lower surface of the cassette mold, and a cassette mold fixing device having clamper claws that engage with the square grooves is provided on each mold base.

Explaining an example in which a conventional cassette mold fixing device is used for a fixed cassette mold, as shown in FIG.
Tightening member having clamper claw 101 that can be engaged with the square groove 30 of
102, and a pressing means 103 for engaging the clamper claw 101 with the square groove 30 and pressing the fastening member 102 so as to press the fixed cassette mold 1 against the mold base 5.
103 is a cylinder 104 provided on the clamper plate 39 of the mold base 5, and the tightening member 1 is fitted into the cylinder 104.
A coil spring 106 is provided, which is composed of a piston 105 that presses 02, and that serves as a biasing unit that returns the piston 105 so as to retract the piston 105.

As shown in FIG. 8, each fixing device 100 provided on the fixed mold base 5 and the movable mold base 6 includes a hydraulic pump 108 and a solenoid valve via a line 107 for driving a pressing means 103. 109 is connected. A sensor (not shown) for monitoring the hydraulic pressure supplied to the cylinder 104 for pressing the tightening member 102 is provided in the pipeline 107, and the cassette mold is fixed and released according to the software for operating these. Done. In this case, as the hydraulic pump 108, an air pressure driven hydraulic pump driven by air pressure is used.
Air pressure source 110, filter with water distributor 111, regulator 112, luplicator 113, solenoid valve 1
14 and 14 are sequentially connected.

When fixing the fixed cassette mold 1 and the movable cassette mold 2, the solenoid valve 109
In the demagnetized state (state of FIG. 8), the hydraulic pump 108 is driven to supply pressure oil to the cylinder 104 of each fixing device 100 to extend the piston 105 and move the tightening member 102, and the clamper claw 101 Is engaged with the square groove 30 of the cassette mold, and the fixed cassette mold 1 and the movable cassette mold 2 are fixed by being pressed against the fixed mold base 5 and the movable mold base 6, respectively. Cassette mold
When releasing the lock to replace 1,2, stop the hydraulic pump 108 and then energize the solenoid valve 109 to discharge the oil in the cylinder 104 to allow the piston 105 to retract and the coil spring. The clamping member 102 is moved by 106, the clamper claw 101 is separated from the square groove 30, and the pressing of the fixed cassette mold 1 and the movable cassette mold 2 to the fixed mold base 5 and the movable mold base 6 is released.

[0006]

However, in the above-mentioned conventional fixing device, when fixing the cassette mold, pressure oil is constantly supplied to the cylinder to press the tightening member and the clamper pawl to the cassette. Since the cassette mold is pressed against the mold base by engaging with the square groove of the mold, the load on the hydraulic circuits such as the pipelines and hydraulic pumps connected to each cylinder is large,
There was a problem that a large one was needed.

Further, in the above-mentioned conventional fixing device, when a clamp failure occurs due to a pressure drop such as output drop of the hydraulic pump or oil leakage in a pipe line or a connecting portion between each cylinder and the hydraulic pump, a cassette is generated. There is a problem that the mold may fall off and be damaged. Further, it is necessary to provide a sensor in order to monitor the hydraulic pressure supplied to the cylinder for pressing the tightening member and detect the pressure drop due to the output reduction of the pump or the oil leakage. Furthermore, due to the above-mentioned problems, there is a problem that the cost for manufacturing the injection molding machine increases.

The present invention has been made in view of the problems of the prior art, and an object thereof is to fix a cassette mold to a mold base easily and surely without requiring a large hydraulic circuit. It is an object of the present invention to provide a fixing device for a cassette mold that can be used.

[0009]

To achieve the above object, a cassette mold fixing device for an injection molding machine according to the present invention comprises a cassette mold detachably attached to a mold base and a fixing for fixing the cassette mold. In the injection molding machine including a device, the fixing device engages the clamping member having a clamper claw engageable with an engaging portion formed in the cassette mold, and the clamper claw with the engaging portion. Urging means for urging the clamping member so as to constantly press and fix the cassette mold to the mold base, and the clamping member to press the clamping member against the urging force of the urging means. It is characterized by comprising a pressing means for releasing the engagement with the rectangular groove.

[0010]

In the fixing device, the tightening member is pressed by the biasing means, the clamper claw of the tightening member engages with the engaging portion of the cassette mold, and the cassette mold is constantly pressed against the mold base. When releasing the fixation to replace the cassette mold as necessary, the pressing member presses the tightening member against the biasing force of the biasing unit, and the clamper claw is pushed from the engaging portion of the cassette mold. The engagement is released by pulling them apart, and the pressing of the cassette mold against the mold base is released.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cassette mold fixing device for an injection molding machine according to the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts. As shown in FIG. 1, the injection molding machine has a plurality of fixed cassette molds 1 and movable cassette molds 2 that form cavities of a predetermined shape, and any one of these cassette molds 1 and 2 can be used. Fixed platen 3 and movable platen 4
The cassette bases 1 and 2 are detachably attached to the mold bases 5 and 6 provided in the above, and the cassette molds 1 and 2 can be exchanged as needed. And movable cassette mold
Mold clamping device 10 for clamping the mold 2, the injection device 11 for injecting and filling the resin material into the cavity, and the mold station accommodating the plurality of cassette molds 1 and 2 to be replaced according to the molded products. It has 12 and.

The mold clamping device 10 includes a fixed platen 3 to which the fixed cassette mold 1 is attached, and a movable platen arranged so as to face the fixed platen 3 and to which the movable cassette mold 2 is attached.
4 and a mold clamping cylinder (not shown) for moving the movable platen 4 closer and farther relative to the fixed platen 3 are provided on the main frame 16. The fixed platen 3 is arranged in the vicinity of the injection device 11, and the end portion of the tie bar 17 is attached. Movable plate 4
Is attached to the ram of the mold clamping cylinder by being inserted into the tie bar 17 so as to be able to approach and retreat with respect to the fixed platen 3. Fixed platen
Fixed cassette mold 1 for 3 and movable plate 4 respectively
And the movable cassette mold 2 are detachably attached so as to face each other, and the movable platen is driven by the mold clamping cylinder.
4 is pressed against the fixed platen 3 and the movable cassette mold 2 of the movable platen 4 and the fixed cassette mold 1 of the fixed platen 3 are clamped to form a cavity having a predetermined shape.

A shooter (not shown) is provided inside the main cradle on the lower side of the mold clamping device, and a belt conveyor (not shown) capable of forward and reverse rotation is provided below the shooter to change the direction. A storage container (not shown) is arranged around the periphery of the belt conveyor where the end of the belt conveyor is located so as to correspond to each type of molded product. The molded product is guided by a shooter onto a belt conveyor (not shown) and is guided to a storage container corresponding to the molded product.

The injection device 11 comprises a heating cylinder 20 for melting a resin material and a nozzle 21 provided at the tip of the heating cylinder 20. The nozzle 21 injects and fills the cavity with the molten resin. It is movably provided so as to come into contact with and retract from the fixed cassette mold 1 so as to obtain it.

The mold station 12 is arranged on a side portion of a main frame 16 which supports the mold clamping device 10, and a mold carriage is provided on an upper surface thereof.
It has 24. The mold carriage 24 includes a pair of guide rails 25.
And a fixed platen 3 and a movable platen along a guide rail 25 by a driving means (not shown) such as a cylinder mechanism.
Moved in the direction opposite to 4. On the upper surface of the mold carriage 24,
Rails (not shown) composed of a plurality of pairs of guide rollers are provided at a predetermined interval so as to be orthogonal to the moving direction, and a fixed cassette mold 1 and a movable cassette mold 2 are formed on each rail. They are placed in a combined state. The cassette molds 1 and 2 are mounted on the rails and mounted on the mold carriage 24.
Is moved according to the movement of. In addition, cassette mold 1,
2 is fixed to the rail by a lock cylinder (not shown) so as not to move unnecessarily when the mold carriage 24 moves. The fixed cassette mold 1 and the movable cassette mold 2 are transferred between the mold clamping device 10 and the mold station 12 by a transfer device (not shown) and exchanged.

As shown in FIG. 4, the fixed cassette mold 1 is provided with positioning pins 29 on the surface facing the movable cassette mold 2, and the upper and lower surfaces are engaged with each other as corners extending in the longitudinal direction thereof. Groove 30 is formed. The movable cassette mold 2 has a positioning hole 31 formed so as to be aligned with the positioning pin 29 of the fixed cassette mold 1, and, like the fixed cassette mold 1, extends in the longitudinal direction as engaging portions on the upper surface and the lower surface. The square groove 30 is formed.
Further, an ejector pin (not shown) and a return pin 32 are inserted into the movable cassette mold 2, and an ejector plate 33 is attached to the end thereof. A coil spring 34 is interposed between the movable cassette mold 2 and the ejector plate 33, and biases the tips of the ejector pin and the return pin 32 so as to pull them from the cavity surface. Further, the fixed cassette mold 1 and the movable cassette mold 2 are formed with a flow path (not shown) for circulating a temperature control medium such as water or oil for adjusting the temperature. The opening of this flow path is provided on the side surface facing the mold station 12, as shown by the phantom line in FIG. 2, and is provided with a male coupler member or a female coupler member (in this embodiment, a male coupler member 35). ) Is installed.

As shown in FIGS. 2 to 4, a mold base 5 is attached to the surface of the fixed platen 3 facing the movable platen 4. The mold base 5 includes a mounting plate 38 mounted on the fixed plate 3, a clamp plate 39 mounted on the upper and lower sides of the mounting plate 38 to support the fixed cassette mold 1, and a mold station 12 of the mounting plate 38. Stopper member 40 that is provided on the side where the fixed cassette mold 1 is positioned
And an automatic coupler unit 42 having a female coupler member 41 that can be coupled / disengaged with the male coupler member 35 of the fixed cassette mold 1.

A through hole 45 for inserting the nozzle 21 is formed in the mounting plate 38 so that the nozzle 21 of the injection device 11 can come into contact with the fixed cassette mold 1, and a locate ring 46 is formed in the through hole 45. Is installed. The clamp plate 39 is provided with positioning pins 47 on the surface facing the movable mold base 6, and on the mold station 12 side of the lower clamp plate 39, a guide rail 48 connectable to the rail of the mold carriage 24. Is provided. The stopper member 40 contacts the side wall of the fixed cassette mold 1 on which the male coupler member 35 is provided, and has a through hole 49 for accommodating the male coupler member 35 and the female coupler member 41 (Fig. Two
reference).

The automatic coupler unit 42 is shown in FIGS.
As shown in FIG. 3, a female coupler member 41 that is connected to and detached from the male coupler member 35 of the fixed cassette mold 1 is provided so as to be able to approach and retreat with respect to the male coupler member 35.
The female coupler member 41 is carried by the sliding member 52, and the sliding member 52
Is slidably inserted through a guide bush 53 into a guide rod 54 provided on the stopper member 40 of the fixed cassette mold 1. A cam member 56 is rotatably supported at the tip of a cam member support rod 55 whose base end is attached to the stopper member 40, and a handle 57 for rotating the cam member 56 is attached to the cam member 56. There is. A coil spring 58 is interposed between the stopper member 40 and the sliding member 52 so as to surround the cam member support rod 55, and urges the female coupler member 41 to separate from the male coupler member 35. are doing. When the handle 57 is rotated as shown by the chain line in FIG. 2, the sliding member 52 is guided by the guide rod 54 by the displacement of the cam member 56 and resists the urging of the coil spring 58. The female coupler member 41 carried by the sliding member 52 is pressed and slid so as to be close to the male coupler member 35 of the fixed cassette mold 1.
When the male coupler member 35 and the female coupler member 41 are not coupled, the passage is blocked by a valve body (not shown) to prevent the temperature control medium from flowing out, and when the temperature control medium is flowed, the temperature control medium is flowed. It is configured to allow. As shown in FIG. 1, a preheating device 60 is provided near the die station 12, and the preheating device 60 includes the same automatic coupler unit 42 and is mounted on the mold clamping device 10. The cassette molds 1 and 2 scheduled to be operated are coupled to the automatic coupler unit 42 during the waiting period and heated to a desired temperature.

In this embodiment, the fixed cassette mold 1 is provided with the male coupler member 35, and the automatic coupler unit 42 of the mold base 5 is provided with the female coupler member 41. However, the present invention is not limited to this embodiment. Without being
It is also possible to provide the male coupler member 35 in the automatic coupler unit 42 and the female coupler member 41 in the fixed cassette mold 1. Also, in this embodiment, a female coupler member
According to an example in which the sliding member 52 carrying 41 is pressed and slid to the male coupler member 35 of the fixed cassette mold 1 by rotating the cam member 56 pivotally supported on the tip of the cam member supporting rod 55. As described above, the side wall member of the fixed cassette mold 1 is not limited to this example.
A fluid pressure cylinder driven by air pressure or hydraulic pressure is provided between the 53 and the sliding member 52, and the sliding member 52 is fixed by driving this fluid pressure cylinder. 1
The coupler members 35 and 41 can be connected / disconnected from each other by pressing and sliding.

As shown in FIGS. 3 to 4, a mold base 6 which is substantially the same as the mold base 5 on the fixed side is attached to the surface of the movable plate 4 facing the fixed plate 3. This mold base 6 includes a mounting plate 38 mounted on the movable plate 4,
A clamp plate 39 that is mounted on the upper and lower sides of the mounting plate 38 via spacers 63 to support the movable cassette mold 2,
A stopper member that is provided on the side of the mounting plate 38 that faces the mold station 12 and that positions the movable cassette mold 2.
An automatic coupler unit having 40 and a female coupler member 41 that can be connected / disconnected with the male coupler member 35 of the temperature control medium flow path.
It is equipped with 42 and.

The movable side mounting plate 38 is for inserting an ejector rod (not shown) for pressing the ejector plate 33 in order to operate the ejector pin and the return pin 32 of the movable cassette mold 2 at a predetermined timing. Through holes 64 are formed (see FIGS. 3 and 4). The movable clamp plate 39 is attached to the mounting plate 38 via the spacer 63, and the ejector pin, the return pin 32, and the ejector plate of the movable cassette mold 2 are attached.
A space 65 for accommodating the 33 is formed (see FIG. 4), a positioning hole 66 is formed so as to be aligned with the positioning pin 47 of the clamp plate 39 on the fixed side (see FIG. 3), and a mold for the lower clamp plate 39 is formed. A guide rail 48 that can be connected to the rail of the mold carriage 24 is provided on the station 12 side. A stopper member 40 is fixed to the side of the mounting plate 38 facing the mold station 12, and an automatic coupler unit 42 similar to the fixed-side mold base 5 is provided.

Fixed side and movable side mold bases 5, 6
Is provided with a fixing device 69 for fixing the fixed cassette mold 1 and the movable cassette mold 2, respectively. The following is a description of the fixing device 69.
The case of fixing 1 will be described. As shown in FIG. 5, the fixing device 69 includes a fastening member 71 having a clamper claw 70 that engages with the square groove 30 formed in the cassette mold 1, and the fastening member 71 in the direction of the mounting plate 38 at all times. A biasing means 72 for biasing,
The pressing member 73 pushes back the tightening member 71 against the urging force of the urging unit 72 as necessary. Clamp plate
A space 74 into which the fastening member 71 is fitted is formed in the 39, and a notch 75 is formed so that the clamp claw 70 of the fastening member 71 is exposed. The pressing means 73 is configured such that a cylinder 76 is provided on the mounting plate 38, and a piston 77 is fitted and inserted into the cylinder 76. In the embodiment, oil is used as the working fluid for driving the piston 77.

The tightening member 71 is composed of a bottomed cylindrical body.
A clamp claw 70 is provided on the outer periphery so as to be exposed from the notch 75, and a coil spring as a biasing means 72 is interposed between the inner bottom surface 71a and the bottom portion 74a of the space 74.
A recess 80 having a hemispherical curved surface with a predetermined curvature is formed on the outer bottom surface 71b with which the piston 77 is brought into contact. on the other hand,
The tip of the piston 77 that comes into contact with the outer bottom surface 71b of the fastening member 71 is formed in a hemispherical shape having a curvature that fits into the recess 80.
Even when the clamping member 71 is inclined in the space 74 by the reaction force received by the clamper pawl 70 engaging with the square groove 30 of the cassette mold 1 and the biasing force of the coil spring 72, the piston 77 is Since the tip end is in contact with the concave portion 80 having a suitable curvature, it is possible to move inside the cylinder 76 without being influenced by the inclination of the tightening member 71.

The cylinder 76 of each fixing device 69 is connected to a manual hydraulic pump 85 by a line 84, as shown in FIG. The manual hydraulic pump 85 rotates the handle 86 to move the oil in the tank 87 to the cylinder 76 of each fixing device 69.
The oil in the cylinder 76 is drained by returning the oil to the tank 87 by opening the valve 88. The fixing device 69 according to the present invention supplies the pressure oil to the cylinder 76 only when the fixation of the cassette mold 1 is released, and it is not necessary to supply the pressure oil to the cylinder 76 in the normal fixing state.
Moreover, since the required pressing force of the piston 77 is sufficient to withstand the biasing force of the coil spring 72,
The manual hydraulic pump 85 can be used without using a large hydraulic pump such as a pneumatic drive hydraulic pump.

Next, the fixing device 69 configured as described above.
The operation of will be described. In a normal state where injection molding is performed in the cavity formed by clamping the cassette molds 1 and 2, the coil spring 72 causes the clamper claws 70 of the clamping member 71 to move into the square grooves 30 of the cassette molds 1 and 2. When engaged, the cassette molds 1 and 2 are pressed and fixed to the mounting plates 38 of the mold bases 5 and 6.

When replacing the cassette mold 1 and 2,
Move the movable platen 4 close to the fixed platen 3
1 With the movable cassette mold 2 aligned, operate the automatic coupler unit 42 to operate the coupler members 35, 41.
, And operate the manual hydraulic pump 85 to operate each fixing device 69.
Supply hydraulic oil to the cylinder 76 of. The piston 77 is a tightening member that extends against the urging force of the coil spring 72.
71 is pressed and moved, and the engagement of the clamper claw 70 with the square groove 30 of the cassette mold 1, 2 is released.

After that, the mold carriage 24 inserted into the guide rail 25 is moved, and the cassette mold of the mold carriage 24 is moved.
The rails on which the 1 and 2 are not mounted are aligned with the guide rails 48, and the cassette molds 1 and 2 removed from the mold bases 5 and 6 are transferred onto the rails of the mold carriage 24 via the guide rails 48. Next, the predetermined cassette molds 1 and 2 connected to the automatic coupler unit 42 of the preheating device 60 are separated, the cassette molds 1 and 2 are placed, and the mold is aligned so that the rails and the guide rails 48 are aligned. Move the dolly 24 and set the preheated cassette molds 1 and 2 to the mold dolly 24.
Is conveyed so as to contact the stopper member 40 of the mold bases 5 and 6 via the guide rail 48. The pre-heated cassette molds 1 and 2 are
Valves of manual hydraulic pump 85 with 5 and 6 positioned
Open 88. The hydraulic oil in each cylinder 76 can be discharged, the piston 77 of the tightening member 71 moves so as to retract due to the urging force of the coil spring 72, and the clamper claw 70 engages with the square groove 30 of the cassette mold 1 and 2. The cassette molds 1 and 2 are fixed by pressing them on the mounting plates 38 of the mold bases 5 and 6, respectively. Next, the automatic coupler unit 42 is operated to connect the male coupler member 35 and the female coupler member 41 to each other, and the temperature control medium is circulated and supplied to the flow paths in the cassette molds 1 and 2 to set the cavity at a predetermined temperature. To adjust.

[0029]

According to the cassette mold fixing device of the injection molding machine of the present invention, a clamping member having a clamper claw engaging with a square groove formed in the cassette mold and a cassette mold are constantly pressed against the mold base. Equipped with urging means for urging the tightening member, and pressing means for pushing back the tightening member against the urging force of the urging means, and the cassette mold is constantly pressed and fixed to the mold base by the urging means. Since the pressing member pushes back the tightening member against the urging force of the urging device to release the fixing, the cassette mold can be stably and easily mounted on the mold base without the need for a large hydraulic circuit. And it can be securely fixed. Further, according to the present invention, a hydraulic sensor or the like for confirming the fixation of the cassette mold is not required, and further, it can be easily attached to an injection molding machine which has been used conventionally, so that the manufacturing cost can be reduced. Can be achieved.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an injection molding machine.

FIG. 2 is a front view of a fixed mold base.

FIG. 3 is a cross-sectional plan view of a mold base.

FIG. 4 is a partially longitudinal side view of the mold base.

FIG. 5 is an enlarged cross-sectional view of the fixing device of the present invention.

FIG. 6 is a conceptual diagram showing a hydraulic circuit connected to the fixing device of the present invention.

FIG. 7 is an enlarged cross-sectional view of a conventional fixing device.

FIG. 8 is a conceptual diagram showing a hydraulic circuit connected to a conventional fixing device.

[Explanation of symbols]

 1 Fixed cassette mold 2 Movable cassette mold 5 Fixed mold base 6 Movable mold base 69 Fixing device 70 Clamper claw 71 Clamping member 72 Energizing means 73 Pressing means 85 Manual hydraulic pump

Claims (1)

[Claims] 1. An injection molding machine comprising: a cassette mold detachably attached to a mold base; and a fixing device for fixing the cassette mold, wherein the fixing device is engaged with an engaging portion formed in the cassette mold. A clamping member having a clamper claw that can be fitted, and a biasing means for biasing the clamping member so that the clamper claw is engaged with the engagement portion and the cassette mold is constantly pressed against the mold base to be fixed. A cassette mold fixing for an injection molding machine, comprising: pressing means for pressing the tightening member against the urging force of the urging means to release the engagement of the clamper claw with the angular groove. apparatus.