JPH02171221A - Injection molding machine - Google Patents

Abstract

PURPOSE:To contrive a reduction in a vibration and noise by coinciding timing of the first and second mold clamping parts with each other and shortening in the whole length of a machine, by a method wherein at the time when the first and second mold clamping parts are made into a mold closing state, an intermediate platen is moved to a stationary platen side. CONSTITUTION:In the case where mold clamping is performed from a mold breaking state, the first and second mold breaking and clamping hydraulic cylinders 47, 48 are contracted and a rotary platen 24 and movable platen 25 are moved to a stationary platen 21 side. In this instance, a moving distance of a movable platen 25 necessary for the mold clamping becomes twice as long as that of the rotary platen 24 since the rotary platen 24 is moved to a stationary platen 2 side if mold thicknesses and moreover mold breaking dimensions of the first and second molds K1, L2 are identical with each other. Then a moving rate of the movable platen 25 becomes twice as fast as that of the rotary platen 24, since the first and second mold breaking hydraulic cylinders 47, 48 are connected with each other through the rotary platen 24 and moreover the inside diameters of cylinder tubes of mold breaking and clamping hydraulic cylinders each are identical with each other. Therefore, timing of mold closing completion of the first and second molds K1, K2 coincide with each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has two sets of injection devices, clamps two sets of molds at the same time, and injects different types of resin, etc. into each mold. This invention relates to an injection molding machine that can perform molding.

[Prior Art] As this type of injection molding machine, the one shown in FIG. 5 is known (t; for example, Japanese Patent Publication No. 5B-54662).

That is, the support plate 2 is fixed on the ped l,
This support plate 2 is connected to its four corners I: tie bars 3. Moreover, a mold clamping board 4 is provided on the bed l so as to be movable in the direction of approaching and separating from the support board 2, and at the four corners of this mold clamping board 4, there are formed at one end of the tie bars 3. A clamping cylinder hole 41 is formed into which the piston 31 is inserted.

The tie bar 3 between the support plate 2 and the mold clamping plate 4 has
A movable plate 5 and a rotary plate 6 are provided to be movable in the axial direction of the tie bar 3, and the movable plate 5 is driven to move by a movable plate moving cylinder 7 connected to the movable plate 5 and the support plate 2. , the rotary disk 6 is connected to the rotary disk 6 and the mold clamping disk 4.
The rotary disk is moved by a cylinder 8 connected to the rotary disk moving cylinder 8. Furthermore, the movable platen 5 is provided with a locking member 9 that engages with a notch 3b formed in the tie bar 3.

In addition, injection devices 110 are provided on the outside of the support plate 2 and the mold clamping plate 4 so as to face each other, and the injection device 10 includes a heating cylinder 11 and a cylinder inserted into the heating cylinder 11. It is equipped with a screw 12 and a screw driving means 13 that drives the screw 12 in the axial direction and rotational direction. The screw driving means 13 includes an injection hydraulic cylinder 14 that is located axially rearward of the heating cylinder 11 and moves the screw 12 in the axial direction, and an injection hydraulic cylinder 14 that is located axially rearward of the injection hydraulic cylinder 14 that moves the screw 12. It is equipped with a hydraulic motor 15 for rotational driving. Each of the injection devices 10 has a supporting plate 2 or a mold clamping plate 4.
The injection device is connected via a cylinder 16 for moving the injection device.

In addition, in the figure, Kl is the first mold held by the mold clamping board 4 and the rotary disc 6, and K2 is the second mold held by the movable board 5 and the rotary disc 6.

In the injection molding machine configured as described above, the rotating plate 6 is moved toward the mold clamping plate 4 by extending the rod of the moving plate moving cylinder 7 and retracting the rod of the rotating plate moving cylinder 8. At the same time, the movable platen 5 moves to the rotary platen 6 side, and the molds 2 are closed in the first mold Kl and the second mold. At that time, the injection device 10 connected to the movable plate 5 moves along with the movable plate 5, and the heating cylinder 11 is inserted into the insertion hole 2 formed in the support plate 2! It comes to protrude from the movable platen 5 side. In this way, the first mold K
1 and the second mold are closed, engage the locking member 9 provided on the movable platen 5 with the notch 3b of the tie bar 3, and then apply pressure oil to the tie bar 3 side of the mold clamping cylinder hole 41. When the mold clamping plate 4 is supplied, the mold clamping plate 4 moves to the movable platen 5 side, and the molds 2 are clamped to the first mold Kl and the second mold. Next, pressure oil is supplied to each injection device moving cylinder 16 to move each injection device 10 to the first mold 1 or the second mold 2 side, thereby heating each injection device 1o. Cylinder 1
1 is pressed against each mold, and the screw driving means 13 is operated to inject the resin in each heating cylinder 11 into each mold.

After the resin in each mold is cooled and solidified, the pressure of the pressure oil in the mold clamping cylinder hole 41 is released to release the mold clamping force, and the locking member 9 is pulled out from the notch 3b of the tie bar 3. Thereafter, the rod of the movable plate moving cylinder 7 is retracted, and the rod of the rotary plate moving cylinder 8 is extended, the rotary plate 6 and the movable plate 5 are moved to the support plate 2 side, and the first mold is Place 2 in the second mold in an open state. As a result, the molded product cooled and solidified in each mold is taken out.

[Problem to be Solved by the Invention j] However, in the above-mentioned conventional injection molding machine, when the mold is closed, the rotary disk 6 moves toward the mold clamping disk 4.
The moving distance is approximately twice the moving distance of the turntable 6. Similarly, when opening the mold, the moving distance of the movable plate 5 is approximately twice the moving distance of the rotary plate 6. The timing of opening and closing was not correct, and the movable plate 5 and rotary plate 6 did not move smoothly, causing vibration and noise. Moreover, since the moving distance of the movable platen 5 is long, the opening and closing time of the public mold becomes long, resulting in a problem that the molding cycle time becomes long.

Furthermore, since the tie bars 3, mold clamping plate 4, etc. are held on the bed 1 by the support plate 2, the strength of the support plate 2 must be made sufficiently large. It is necessary to consider making the diameter small enough to allow the heating cylinder 11 to be inserted therethrough. Therefore, as the injection device 1O, the injection hydraulic cylinder 14 and the hydraulic motor 15 are installed vertically behind the heating cylinder 11 in the axial direction, and only the heating cylinder 11 is connected to the insertion hole 2 of the support plate 2! It is necessary to configure it so that it protrudes from the movable board 5 side. For this reason, the screw drive device 13
There is a problem in that the injection molding machine extends for a long time in the axial direction rearward of the heating cylinder 11, and the overall length of the injection molding machine becomes long.

The present invention has been made in view of the above circumstances, and is
The purpose of the present invention is to provide an injection molding machine that can reduce vibration and noise by synchronizing the timing of mold opening and closing of a second mold clamping part and a second mold clamping part, and also reduce the overall length of the machine. .

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a fixed platen having a plurality of mold clamping cylinder holes and fixed on a bed, and a fixed platen having a plurality of clamping cylinder holes in each mold clamping cylinder hole of the fixed platen. A tie bar extending in parallel from the fixed plate into which a piston formed at one end is inserted, a movable plate movable along the tie bar, and a tie bar between the movable plate and the fixed plate. an intermediate plate which is provided movably along the fixed plate and constitutes a first mold clamping part with the movable plate, and a second mold clamping part with the movable plate; this intermediate plate and the fixed plate; connected to,
a first mold opening/closing cylinder that moves and drives the intermediate plate in a direction toward and away from the fixed plate; and a first mold opening/closing cylinder connected to the intermediate plate and the movable plate, and a direction in which the movable plate moves toward and away from the intermediate plate. a second mold opening/closing cylinder that is driven to move, a connecting means that connects and disconnects the movable plate and the tie bar, and an injection device that is located outside the fixed plate and the movable plate so as to face each other. It is equipped with the following.

[Function] In the present invention, by contracting the ronds of the first mold opening/closing cylinder and the second mold opening/closing cylinder, the intermediate plate moves to the fixed plate side, and the movable plate moves to the intermediate plate side, The first mold clamping part and the second mold clamping part enter the mold closed state. At this time, since the intermediate plate has moved to the fixed plate side,
The movable plate will move approximately twice the distance traveled by the intermediate plate, but since the second mold opening/closing cylinder itself is connected to the intermediate plate and moves at the same speed as the intermediate plate, the movable plate will move approximately twice as far as the intermediate plate. It moves at about twice the speed of the board. Therefore, the timings at which the first mold clamping part and the second mold clamping part finish closing the mold almost coincide with each other. Similarly, the timing at the end of mold opening is determined by the first mold clamping part and! They almost match at the mold clamping part 2.

Furthermore, when the mold is closed, the movable plate and the tie bar are connected by the connecting means, and in this state, by supplying pressure oil to the tie bar side in the mold clamping cylinder hole, the tie bar moves to the fixed plate side. The movable platen moves toward the fixed platen, and the first mold clamping part and the second mold clamping part enter the mold clamping state.

As described above, since the fixed platen is fixed on the bed, the fixed platen can support the tie bars, intermediate platen, and movable platen on the bed. It is no longer necessary to use the support plate that was required to support the For this reason, the injection device can be freely moved to the movable plate side without being obstructed by the support plate, and therefore the structure of the injection device is configured such that, for example, the screw linear drive means is placed next to the heating cylinder. As a result, the overall length of the injection molding machine can be shortened.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 and 2, reference numeral 21 indicates a fixed plate 21 fixed to the pet 22, and four tie bars 23 extend in parallel from this fixed plate 21.
A rotary disk (intermediate disk) 24 and a movable disk 25 are provided above.

The fixed plate 21 is formed into a rectangular plate shape, and has a nozzle insertion hole 21 formed in a conical shape in the center thereof.
1 is formed, and mold clamping cylinder holes 21b are formed at its four corners. A tie bar 23 is inserted into each mold clamping cylinder hole 21b.

The tie bar 23 has at one end a piston 2 that fits into the mold clamping cylinder hole 21b of the fixed platen 21 so as to be movable in the axial direction.
6, one end is formed as a small diameter portion 23a, and the other end is formed as a large diameter portion 23b, with the substantially central portion in the longitudinal direction as a border. The tie bar 23 has a piston 26 fitted into each mold clamping cylinder hole 21b, and projects vertically from the mold mounting surface 21c of the fixed platen 21.
A rotary disk 24 is slidably provided in the small diameter portion 231, and a movable disk 25 is slidably fitted in the large diameter portion 23b.

The rotary disk 24 is connected to the small diameter portion 23 of the two upper tie bars 23.
& an upper bearing portion 27 having a through hole 27J that is fitted in the axially movable portion, and a small diameter portion 2 of the two lower tie bars 23.
The lower bearing part 28 has a through hole (not shown) that is fitted into the lower bearing part 31 so as to be movable in the axial direction, and the lower bearing part 2B and the upper bearing part 27 have an axis centered in the vertical direction in FIG. The rotary block 29 is rotatably connected to the rotary block 29. This rotating block 29 is formed in the shape of a square prism, and each peripheral surface is used as a mold mounting surface 29. A hydraulic ejector cylinder (not shown) for causing an ejector rod (not shown) to protrude outward from each mold mounting surface 291 is configured within the rotating block 29. This hydraulic ejector cylinder is
It is connected to an external hydraulic power source through a rotary joint (not shown) provided between the rotary block 29 and the lower bearing portion 28 . Further, the lower bearing portion 28 is connected to a linearly movable support member 31 installed on the bed 22 via a height adjustment member 30.

The height adjustment member 30 includes an upper plate 32 and a lower plate 33 connected via an inclined sliding surface.
By attaching the lower plate 33 in a shifted manner with respect to 2, the height from the linearly movable support member 31 can be adjusted.

The linearly movable support member 31 has two tie bars 23 on the lower side.
The bed 22 is provided with a rail 34 fixed in parallel to each tie bar 23 at each position on the bed 22 corresponding to the above, and a moving body 35 supported by the rail 34 and movable along the rail 34. , the lower plate 33 of the height adjusting member 30 is connected to the upper surface of the movable body 35.

The movable plate 25 is formed in a rectangular plate shape, and a nozzle insertion hole 251 is formed in the center thereof.
At its four corners, through holes 25b are formed, through which the large diameter portions 23c of the tie bars 23 are inserted.

A mold mounting surface 25c is formed on the movable plate 25 on the side facing the rotary plate 24.
A vertical groove 25d extending in the vertical direction is formed in a portion of the surface opposite to c from which the tie bar 23 protrudes.
The vertical groove 25d is covered and a tie bar 23 is attached to the part d.
A cylindrical body 36 is attached to which is slidably fitted in the axial direction.

The lower end surface of the movable platen 25 configured in this manner is connected to the movable body 35 of the linearly movable support member 31 via the height adjustment member 30.

Further, the tie bar 23 is provided with a stopper block 37 on its large diameter portion 23b to prevent the movable plate 25 from moving toward the rotary plate 24 side.

The stopper block 37 is connected to the large diameter portion 23 of each tie bar 23.
It is fixed with bolts to the chamfered part formed in b, and by adjusting the mounting position of the chamfered part, it can be adjusted so that it contacts the mold mounting surface 25C of the movable platen 25 at the same time. There is.

Furthermore, a lock member 38 is provided on the movable plate 25 so as to be movable along the vertical groove 25d.

As shown in FIG. 3, the lock member 38 is guided by a vertical groove 25d of the movable plate 25, and has two left and right sides that are movable in the vertical direction.
A set of lock plates 39.39, a connecting plate 41 connecting these lock plates 39.39 with a port 40, and a locking hydraulic cylinder 4 connected to this connecting plate 41.
2. The lock plate 39 is formed into a rectangular plate shape, and has a length narrower than the large diameter portion 23b of the tie bar 23 at the center position in the width direction, in accordance with the pitch of the upper and lower tie bars 23. The hole 391 is formed long in the vertical direction, and the upper elongated hole 39! A circular hole 39b having a diameter slightly larger than the large diameter portion 23b of the tie bar 23 is formed continuously on the lower side thereof. Also, the lower long hole 39! The lower side thereof is opened at the lower end of the lock plate 39. The connecting plate 41 is a band-shaped member that is curved upwardly in a convex manner, and is designed so as not to block the nozzle insertion hole 251 of the movable plate 25 when the left and right lock plates 39 and 39 are connected. It has become. The locking hydraulic cylinder 42 has a cylinder tube 421 fixed to a bracket 25C formed at the upper end of the center portion of the movable plate 25 in the left-right direction, and a tip end of a rod 42b connected to the center portion of the connecting plate 41 in the left-right direction. It is what was done.

Further, the tie bar 23 is formed with a notch 23c having a diameter that engages with the elongated hole 39a of the lock plate 39 when the mold mounting surface 25c of the movable platen 25 is in contact with the stopper block 37. . The notch 23c formed in the tie bar 23 and the locking member 38 constitute a connecting means for connecting and disconnecting the movable member 1125 and the tie bar 23.

Further, as shown in FIGS. 1 and 2, the upper and lower tie bars 23 located on the left and right sides have their other end surfaces connected to each other by a connecting plate 43. Each connection plate 43 is provided with mold thickness adjustment means 44 on its back side (opposite side to the movable board 25).

The mold thickness adjusting means 44 includes a mold thickness adjusting hydraulic cylinder 45 and a hydraulic device for controlling the mold thickness adjusting hydraulic cylinder 45.

The mold thickness adjusting hydraulic cylinder 45 has a rod 45a connected to a connecting plate 43 at a position that coincides with the axis of the lower tie bar 23, and a cylinder tube 45b fixed on the pet 22 via a pedestal 46. It is something. The mold thickness adjusting hydraulic cylinder 45 is controlled by a hydraulic system as shown in FIG.

That is, each mold thickness adjustment hydraulic cylinder 4 arranged on the left and right
5, its rod side and head side are each connected to the seat type electromagnetic switching valve M1%M1..., and the seat type electromagnetic switching valve Ml is further connected to the B port of the electromagnetic switching valve M2 on the rod side. The two on the head side are connected to the A port of the electromagnetic switching valve M2. The seat type electromagnetic switching valve M1 is formed of a two-position switching valve, and is in a state where all ports are blocked by a check mechanism in the neutral position. Therefore, the seat type electromagnetic switching valve M1 has extremely little leakage of pressure oil at the neutral position. Also, sheets! The electromagnetic switching valve M1 connects the upstream side and the downstream side when the solenoid Mla is excited. On the other hand, the electromagnetic switching valve M2 is a 3-position switching valve with ABR connection in the neutral position, and when the solenoid M 2 a is energized, it uses pressure oil supplied from the hydraulic source P for mold thickness adjustment. Pressure oil is supplied to the head side of the hydraulic cylinder 45, and when the solenoid M2b is excited, pressure oil is supplied to the rod side of the mold thickness adjusting hydraulic cylinder 45.

In addition, first mold opening/closing hydraulic cylinders 47 are provided on the left and right sides of the rotary plate 24 and the fixed plate 21 at upper and lower positions,
Also, on the left and right sides of the rotary plate 24 and the movable plate 25, there are second cylinders whose axes coincide with the first mold opening/closing hydraulic cylinder 47.
A hydraulic cylinder 48 for opening and closing the mold is provided.

The first mold opening/closing hydraulic cylinder 47 has a cylinder tube 47b whose inner diameter is smaller than that of the mold clamping cylinder hole 21b, and the rod 47! can be expanded and contracted at high speed.

The mold opening/closing hydraulic cylinder 47 of each node 1 has its cylinder tube 47b connected to the side surface of the fixed platen 12.
The tip of the rod 47 & is connected to the upper bearing part 27 or the lower bearing part 28 of the rotary disk 24 .

On the other hand, the second mold opening/closing hydraulic cylinder 48 has the same cylinder tube inner diameter and stroke as the first mold opening/closing hydraulic cylinder 47, and its cylinder tube 48b is attached to the side surface of the movable platen 25. The tips of the rods 48 & are connected to the upper bearing part 27 or the lower bearing part 28 of the rotary disk 24. Further, a stopper bolt 49 is screwed into the upper bearing portion 27 and the lower bearing portion 28 of the rotary disk 24 at a position facing the stopper block 37 .

The stopper port 49 has the end face of the head 49 directly in contact with the end face of the stopper block 37, and the rotary plate 2 when the mold is opened.
4, and by adjusting the screwing amount, the stop position of the rotary disk 24 can be adjusted.

In the mold clamping device configured as above, the identification board 2
1 and the rotary disk 24 constitute a first mold clamping section, and the movable disk 25 and the rotary disk 24 constitute a 20th mold clamping section. A first injection device 51 and a second injection device 61 are provided at positions outside the fixed platen 21 and the movable platen 25 so as to face each other.

The first injection device 51 is supported by a guide frame 52 fixed on the bed 22 so as to be movable in the direction toward and away from the fixed platen 21, and includes a heating cylinder 53 and a heating cylinder 53.
3, and a screw drive means 55 for driving the screw 54.

The screw drive means 55 is a linear drive section 5 of the screw 54.
6, and a rotation drive section 57 of the screw 54, and the linear drive section 56 has a heating tube holding section 56! that holds the heating tube 53 at its center. is formed, and injection hydraulic cylinders 56 are located at the left and right positions of this heating cylinder holding portion 561.
k is constructed. And this linear drive section 5
6 is movably supported by a guide frame 52, and its lower end is connected to the fixed platen 21 via a hydraulic cylinder 58 for moving the injection device. Further, each injection hydraulic cylinder 56b of the linear drive section 56 has its rod 56
c is connected to the rotation drive section 57. Rotation drive unit 57
is provided with a hydraulic motor 59 that rotationally drives the screw 54, and the rotational drive section 57 is also connected to the guide frame 5.
It is movably supported by 2.

The second injection device 61 is arranged on two rails 62 fixed on the bed 22 and aligned in the direction of approaching and separating from the movable platen 25.
It is installed on a movable guide frame 63 that moves above, and has a heating cylinder 53, a screw 54, and a screw driving means 55 similar to those of the first injection device 51. However, the rotational drive ffts 57 of the screw drive means 55 is
Although it is movably supported by the movable guide frame 63, the linear drive unit 56 is fixed to the movable guide frame 63.

Further, this movable guide frame 63 is connected to the movable platen 25 by a hydraulic cylinder 64 for moving the injection device.

In addition, in FIGS. 1 and 2, Kl is the first mold, and K2 is the second mold.

Next, the operation of the injection molding machine configured as described above will be explained.

First, when clamping the mold from the open state, the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48
Shrink the rod and fix the rotary plate 24 and movable plate 25! Move to the 121 side. At this time, the movable platen 2 required for mold opening
The moving distance of 5 is 2 for the first mold Kl and the second mold.
If the mold thicknesses are the same and the mold opening dimensions are the same, the rotary plate 24 moves toward the fixed plate 21, so that the two parts of the rotary plate 24 are the same.
Double. The moving speed of the moving platen 25 is determined by the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 4.
8 are connected via the rotary disk 24, and since the inner diameter of the cylinder tube of each mold opening/closing hydraulic cylinder is the same, the diameter is twice that of the rotary disk 24. Therefore, the timing of completion of mold closing of the first mold 1 and the second mold 2 coincides with each other. Then, when the mold closing is completed, the mold mounting surface 25c of the movable board 25 comes into contact with the stopper block 37, and at this point, the mold closing completion state is detected by a limit switch (not shown), and the first mold opening/closing is started. The supply of pressure oil to the hydraulic cylinder 47 and the second hydraulic cylinder 48 for mold opening/closing is stopped,
Pressure oil is supplied to the head side of the locking hydraulic cylinder 42. Then, the lock plate 39 moves downward,
The long length 391 of the lock plate 39 engages with the notch 23c of the tie bar 23. As a result, the movable platen 25 becomes connected to the tie bar 23. In this state, the solenoid Mla of the seat type electromagnetic switching valve Ml is energized to open the seat type electromagnetic switching valve M1, and the mold thickness adjustment hydraulic cylinder 45
The rod 451 can be freely expanded and contracted. Then, pressure oil is supplied to the tie bar 23 side of the mold clamping cylinder hole 21b, and the tie bar 23 is moved to the fixed platen 21 side. Then, the tie bar 23 moves to the fixed platen 21 side, and the movable platen 25 moves to the fixed platen 21 side via the notch 23C10 lock plate 39 of the tie bar 23, and connects the first mold Kl and the second mold. 2 is in the mold clamping state.

At this time, the mold clamping force is adjusted by adjusting the pressure of the pressure oil supplied to the mold clamping cylinder hole 21b. Furthermore, the thickness of the mold can be adjusted by the amount of movement of the piston 26 within the mold clamping cylinder hole 21b.

To inject resin into a mold that has been clamped as described above,
Supply pressure oil to the injection device moving hydraulic cylinders 58, 64 to move the first injection device 51 to the fixed platen 21 side, and move the second injection device 61 to the movable platen 25 side,
The nozzle tip of the heating cylinder 53 of each injection device is connected to the nozzle insertion hole 2.
1a or nozzle insertion hole 25! 2 to the first mold Kl or the second mold. At this time, the second injection device 61 is already moved together with the movable platen 25 by being pulled by the injection device movement hydraulic cylinder 64 when the movable platen 25 is moved, so the second injection device 61 is almost the same as the first injection device 51. The tip of the heating cylinder 53 comes into contact with the second mold 2 by a moving distance of . Then, with the tip of each heating cylinder 53 pressed against each mold, pressure oil is supplied to each injection hydraulic cylinder 56b,
The rotation drive unit 57 is moved toward the heating cylinder 53 side. Then, the screw 54 moves to each mold side, and the screw 54 moves to each mold side.
The resin on the tip side of No. 4 is injected into each mold. After injection, while the resin is being cooled in each mold, pressure oil is supplied to the hydraulic motor 59 to rotate the screw 54, thereby melting the resin and moving it to the tip side of the screw 54. When the movement of the resin is completed, and before the mold is opened, pressure oil is supplied to the hydraulic cylinders 58 and 64 for moving the injection device, and the heating cylinder 5 is removed from each mold.
Release the tip of 3. After the resin has cooled and solidified, the mold is opened slowly and the molded product is taken out.

When opening the mold, first, pressure oil is supplied to the head side of the piston 26 in the mold clamping cylinder hole 21b, and the movable platen 25 is opened.
is slightly moved in the direction away from the fixed platen 21 to release the mold clamping state. Then, the pressing force between the end face of the notch 23c of the tie bar 23 and the elongated hole 391 of the lock plate 39 is released, and the lock plate 39 becomes able to rise. In this state, the solenoid M2a of the electromagnetic switching valve M2 is energized to supply pressure oil to the head side of the left and right hydraulic cylinders 45 for mold thickness adjustment. Then, each mold thickness adjustment hydraulic cylinder 4
5 force is transmitted to the upper and lower tie bars 23 via the connecting plate 43, and the mold thickness position is corrected by the balance of the pressure oil force from the head side force of the piston 26, improving the accuracy of the mold opening completion position next time. becomes. Then, after returning the seat-type electromagnetic switching valve Ml and the electromagnetic switching valve M2 to the neutral position, pressure oil is supplied to the rod side of the locking hydraulic cylinder 42 to raise the lock plate 39 and increase the length of the lock plate 39. hole 3
9! The engagement state between the tie bar 23 and the notch 23c is released.

As a result, the movable platen 25 becomes movable relative to the tie bar 23. However, the hydraulic cylinder 45 for mold thickness adjustment
Since the seat type electromagnetic switching valve M1 is returned to the neutral position and the hydraulic oil on the rod side and head side is completely closed, movement of the tie bar 23 in the axial direction is reliably prevented. In this state, pressure oil is supplied to the heads of the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48 to move the rotary plate 24 and the movable plate 25 in a direction away from the fixed plate 21. do.

As a result, molds 1 and 2 are opened in the first mold and the second mold, respectively. When the mold opening is completed, the head 4 of the stopper port 49 provided on the rotary disk 24 is
91 comes into contact with the stopper block 37, and at this point, a limit switch (not shown) detects that the mold opening has been completed, and the pressure is applied to the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48. Stop the pressure oil supply.

The position at which the mold opening is completed can be adjusted in various ways by adjusting the screwing amount of the stopper bolt 49. Also, when opening the mold, the moving distance of the movable plate 25 is twice the moving distance of the rotary plate 24, but the moving speed of the movable plate 25 rotates! Since it is twice the moving speed of x24, the timing of mold opening completion coincides.

In addition, by rotating the rotating block 29 of the rotating disk 24 with a rotational drive mechanism such as a hydraulic motor (not shown), and rotating the rotating block 29 by 180° for each cycle of molding, injection is performed by the first injection device 51. The second resin injected by the second injection device t61 is laminated on the first resin molded product obtained by the above process, thereby obtaining a two-layer molded product having different colors, materials, etc. In addition, by rotating 90 degrees at a time, inserts can be inserted from the operation side or the non-operation side.
Secondary processing such as outsert and tertiary processing such as hot stamping are possible. The apparatus for secondary processing and tertiary processing is preferably installed at the mold closing completion position and the mold opening completion position of the rotary disk 24 on the operation side or the non-operation side.

In the injection molding machine configured as described above, the moving distance of the movable plate 25 is twice that of the rotary plate 24, but the moving speed of the movable plate 25 is twice that of the rotary plate 24, so the first It is possible to match the timing of the completion of mold closing and the completion of mold opening of the mold 1 and the second metal ff1K2 in the mold. Therefore, it is possible to prevent a delay in the opening and closing time of the second mold, so that the molding cycle time can be shortened compared to the conventional method. Furthermore, since the timings of mold closing and mold opening are the same, it is possible to prevent the vibration and noise that would otherwise occur due to mismatched timing, and to reduce the vibration and noise of the injection molding machine. can.

Furthermore, since the connecting plate 43 is to transmit the force of the hydraulic cylinder 45 for mold thickness adjustment to the upper and lower tie bars 23, it is not necessary to have a large one in terms of strength, and a plate-like plate that connects the tie bars 23 is sufficient. be.

Therefore, the connection plate 43 does not get in the way of the movement of the second injection device 61, and therefore the second injection device 6
1 structure, an injection hydraulic cylinder 56 is installed next to the heating cylinder 53.
It is possible to create a structure in which b is placed. For this reason, compared to the conventional structure in which the injection hydraulic cylinder and hydraulic motor are arranged vertically behind the heating cylinder in the axial direction,
Since the injection hydraulic cylinder 56b is arranged laterally, the overall length of the second injection device 61 can be shortened, and the overall length of the injection molding machine can be shortened accordingly.

Furthermore, the positions of the rotary plate 24 and the movable plate 25 can be corrected to the mold closing completion position by the mold thickness adjusting hydraulic cylinder 45 for each cycle of molding, so that mold clamping is started from the closed state. The amount of movement of the movable plate 25 at this time can be made extremely small. Therefore, the time from the mold closing completion state to the mold clamping completion state can be shortened, and from this point of view as well, there is an advantage that the molding cycle time can be shortened.

Furthermore, simply by supplying pressure oil to the locking hydraulic cylinder 42, the elongated hole 39& of the lock plate 39 can be engaged with the notch 23c formed in the tie bar 23.
The movable platen 25 and the tie bar 23 can be connected extremely simply.

[Effects of the Invention] As explained above, according to the present invention, the moving distance of the movable plate is approximately twice that of the intermediate plate, but the moving speed of the movable plate is approximately twice that of the intermediate plate. The timing of completion of mold closing and completion of mold opening of the first mold clamping part and the second mold clamping part can be made substantially coincident.

Therefore, the mold opening/closing time of the second mold clamping part does not lag behind the opening/closing time of the first mold clamping part, so that the molding cycle time can be shortened by that much compared to the conventional method. Moreover, since the timings of mold closing and mold opening are the same, it is possible to prevent the vibrations and noises that would normally occur due to mismatched timings, thereby reducing the vibrations and noise of the injection molding machine. .

In addition, since the fixed platen is fixed on the bed and the tie bar intermediate plate and movable platen are supported on the bed, there is no need for a support plate that was conventionally provided outside the movable platen.
The movable plate can be freely moved without being obstructed by the support plate. Therefore, the structure of the injection device can be configured such that, for example, the screw drive means is arranged next to the heating cylinder, and as a result, the overall length of the injection device can be shortened, and the injection molding machine can be increased accordingly. It has the advantage that the overall length can be shortened.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing an embodiment of the present invention, in which Figure 1 is a cutaway plan view of the main parts of an injection molding machine showing the mold in an open state, and Figure 2 shows an injection molding machine in a closed state. FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 1, FIG. 4 is a hydraulic circuit diagram showing the hydraulic system, and FIG. 5 is a conventional example. FIG. 2 is a front view with a main part cut away of the injection molding machine. 1... Fixed plate, 1b... Mold clamping cylinder hole, 2... Bed, 3... Tie bar 31... Notch, 4. ...Rotating disk (intermediate disk), 5...Moving plate, 6...Piston, 8...Lock member, 7...First Hydraulic system for opening and closing the mold 8...Second hydraulic system for opening and closing the mold...First injection device, l...Second injection device. Linda, Ring,

Claims (1)

[Claims] A fixed plate having a plurality of mold clamping cylinder holes and fixed on a bed, and a piston portion formed at one end of the fixed plate being inserted into each mold clamping cylinder hole and extending in parallel from the fixed plate. a movable plate provided movably along the tie bar; and a movable plate provided movably along the tie bar between the movable plate and the fixed plate;
an intermediate plate that constitutes a second mold clamping part together with the movable plate; and an intermediate plate that is connected to the intermediate plate and the fixed plate, and that moves the intermediate plate toward and away from the fixed plate; a first mold opening/closing cylinder that is driven to move in the direction; a second mold opening/closing cylinder that is connected to the intermediate plate and the movable plate and drives the movable plate to move in a direction toward and away from the intermediate plate; An injection molding machine comprising: a connecting means for connecting and disconnecting the movable plate and the tie bar; and an injection device located outside the fixed plate and the movable plate so as to face each other. .