JPS58183231A - Injection molding machine - Google Patents

Abstract

PURPOSE:To clamp a plurality of molds simultaneously by one mold clamping device by mounting other movable plate between both fixed and movable plates and simultaneously clamping a plurality of the dies among each plate. CONSTITUTION:Pressure oil works to the oil chambers 38a, 40a of boost cylinders 38, 40 under the state of mold opening, and the first and second movable plates 25, 36 progress to the right in the figure. The quantity of pressure oil working to the boost cylinders 38, 40 is reduced slightly before the first molds 21, 33 and the second dies 34, 35 are each in contact with contact surfaces A, B, and the movable plates 26, 36 are progressed at low speed. When the second movable plate 36 collides with a first slipper ring 43 fitted to a guide shaft 42, a support plate 22 also progresses to the right simultaneously while a tie bar 23 also moves. Since a lock nut 37 is engaged with the screw section 23 of the tie bar 23 and the first dies 21, 33 and the second molds 34, 35 are clamped completely, the molds can be clamped instantaneously when pressure oil is worked to a mold clamping cylinder 25, and a molding cycle can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-productivity injection molding machine that uses two or more molds to simultaneously clamp the molds with one mold clamping device. In an injection molding machine having a mold clamping device that clamps the mold by moving a movable plate on which a movable mold is mounted relative to a fixed plate on which a mold is mounted, one or more other parts are arranged between the fixed plate and the movable plate. Injection molding in which a movable plate 1 is provided, a plurality of molds are provided between each plate, and one mold clamping device simultaneously clamps the plurality of molds to perform injection molding. It's about machines.

Recently, in order to improve productivity, the installation area of equipment has been reduced,
Considerable progress is being made in reducing the weight of machines, downsizing hydraulic drive sources, and increasing operating speed. However, the above requirements are not fully satisfied.

To explain the conventional device with reference to FIG. 1, 1 is l? Fixed plates 1 and 2 fixed to a bed (not shown) with II1 fixed molds
It is attached to the tl. Reference numeral 3 denotes a support plate which is fixed to one end of the counter-piss 1/j of the tieper 4 so that it can be freely moved on a plate 1- (not shown).

1) One end of the styper 4 described in II is fixed to the support plate 3, and the other end forms a piston 5, which is slidably fitted into the mold clamp/ring 6 attached to the fixed plate 2. Additionally, a 1d groove (hereinafter simply referred to as a screw 4a) is provided extending from the center of the tenon to the one end. A movable mold 7 is attached to a movable plate 8.

The movable plate 8 is slidably supported by the typer 41 described in II, and has a groove 11 on the inner diameter surface, and when the mold is clamped, the movable plate 8 is integrally engaged with the screw 4a of the front ++L''2 typer 4. Two locks 1, 1 and 9 are installed so as to sandwich the matching typer 1 from both sides. Numeral 10 is a boost cylinder fixed to the fixed plates 1 and 2.
The piston 11 is attached to the (automatic) plate 8, and l2 is a guide shaft for moving the tieper 4, which is fixed to the movable plate 8, and is fixed to the movable plate 8 through the center hole of the support plate 3. A plurality of I413 are provided near the tip to correspond to the thickness of the structure M and 7 and the moving plate 8.L4 is removably attached to the structure 1:3. It's a stop ring.

Next, to explain the operation, the forward oil chamber (left chamber in the figure) of the boost/cylinder 10 at the position shown in the figure 1
When pressure oil is applied to t>a, the moving plate 8 moves to the right. A little before the stop ring 14 of the guide shaft 12 hits the support plate 3, the amount of pressure oil applied to the boost/ring 10 is reduced to move the moving plate 8 forward at a low speed.

Next, when the stop ring 14 hits the support plate 3, it continues to move to the right together with the tieper 4 fixed to the support plate 3, and the mold 7 attached to the movable plate 8 is moved to the fixed plate 2. The installation continues until it comes into contact with the mold piece L. 1 During this period, when the stop ring 14 and the support plate 3 collide, the 2
The split lock nut 9 is attached to the screw 4a of the tieper 4.
The boost cylinder 10 receives a specified signal to be engaged.
At the end of the stroke, that is, at the same time as the molds 1 and 7 come into contact, the engagement of the tieper 4 with the screw 4a is completed. Therefore, the mold clamping cylinder 6 can start the mold clamping operation.

As explained above, the molding cycle is fast and injection molding can be performed fairly efficiently when molded using one set of molds, but it is still insufficient for producing a large number of molded products. .

The present invention eliminates the above-mentioned drawbacks and provides an injection molding machine that can simultaneously obtain many molded products by using a conventional mold clamping device and a plurality of molds. be.

Next, one embodiment of the present invention will be described with reference to FIGS. 2 and 3. Reference numeral 21 is a mold piece of the first mold and is not attached to a fixing plate 2 fixed to a plate (not shown). . 22 is a support plate that is fixed to the side opposite to the piston of the tie bar 23 and slides on a bed (not shown)! , so that it can be moved freely. The tie bar 23 has one end fixed to the support plate 22 and the other end formed with a biston 24, and is slidably inserted into a mold clamping cylinder 25 attached to the fixed plate 2.
A screw 23a is formed from the center to the one end on the side opposite to the piston.

A first movable plate 26 is slidably supported in the axial direction of the tie bar 23. Hot runner plates 27 and 28 are attached to both sides of the first movable plate 26, and hot runners 27a and 28a, which will be described later, are provided, respectively, and injection devices 29 and 3° are provided on the sides. Nozzle touch parts 31 and 32 are provided in which the nozzles abut and have inlet holes. The hot runner plate 27 is attached to the first movable plate 26 facing the IM fixed plate. A mold piece 33 that is a counterpart of the mold piece 21 of the first mold is attached, and the hot runner plate 27 on the back side is attached to the hot runner plate 27. A mold piece 34 of a second mold is attached to the plate 28,
The hot runners 27a and 28a are open, respectively. Reference numeral 35 denotes a mold piece that is a companion to the mold piece 34 of the second mold, which is attached to the first moving plate 26 . The second movable plate 36 is slidably supported by the tie bar 23 and has a screw 23a on its inner diameter surface, and the tie bar 2 is integrally meshed with the screw 23a of the tie bar 23 when the mold is clamped.
A two-part lock nut 37 is installed so as to sandwich 3 from both sides. A boost cylinder 38 is fixed to the fixed plate 2, and its piston port 39 is attached to the first moving plate 26, and hydraulic oil acts on the oil chamber 38a of the boost cylinder 38 during mold clamping. 1!21 and 33 are brought into contact with the first metal at the mold joint surface A. A second boost cylinder 40 is fixed to the first moving cylinder 26, and its piston rod 41 is attached to the second moving plate 36, and an oil chamber 40aKrrf oil acts during mold clamping.
The second molds 34 and 35 are joined at the mold contact surface 13. Reference numeral 42 denotes a tie bar moving 141 guide shaft, one end of which is engaged with the support plate 22, and the other end of which is connected to the first and second moving plates 26 and the through hole 26 of 36.
a, 36a, and is slidably inserted into the through hole 2a of the fixing plate 2. A first stop ring 43 having a smaller diameter than the through hole 26a of the first movable plate 26 and a larger diameter than the 1W through hole 36a of the second movable plate 36 is detachably attached to the intermediate portion of the tie bar moving guide 42. and the first stopper ring 4.
The first movable plate 2 is moved from the empty fixed die plate.
A detachable second stopper ring 44 having a larger diameter than the through hole 26a of No. 6 is provided.

The structure is as shown in 1- below. Next, to explain the working area, when the second umbrella is in the open state, the oil chambers 38a and 40a of the boost cylinders 38 and 40
Pressure oil acts on the first and second moving plates 26.
and 36 move to the right in the figure.

Slightly before the first molds 21 and 33 and the second molds 34 and 35 come into contact with the contact surfaces A and B, 1 of the pressure oil acting on the boost cylinders 38 and 40 is reduced, The moving plates 26 and 36 are advanced at low speed. Next, when the second moving plate (6) collides with the first stopper ring 43 provided on the guide shaft 42 for moving the front Me tie bar, the support plate 22 also moves to the right together, and at the same time the tie bar 23 also moves to the right. 1 to be moved, in this case the first strike,
When the paring ring 43 and the second movable plate 36 collide, the two-split opening and nut 37 receive a command to engage with the threaded portion 23s of the tie bar 23, and the first and second
When the boost sills 38 and 4o are completed, the engagement of the threaded portions 23;lIc of the tie bar 23 is completed.

Therefore, the lock nut 37 is attached to the threaded portion 2 of the tie bar 23.
3; Since the first molds 21 and 33 and the second molds 34 and 35 have been clamped, mold clamping is completed.
By applying pressure oil to the mold 25, the mold clamping operation can be performed immediately, and the molding cycle can be shortened. i! To explain the mold opening operation, when pressure oil acts on the mold opening side oil chamber of the mold clamping 7/der 25 from the state shown in FIG. 3 in response to a mold opening command signal, the tie bar 23 slowly moves to the left. At the same time, the supporting plate 22 and the guide shaft 42 for moving the tie bar also move in synchronization with the tie bar 23. As the tie bar moving guide shaft 42 moves to the left, the first stroke and the paring 4:3 hit the second moving plate 36, and the moving plate 36
is advanced to the left to open the second molds 34 and 35. Said first strike.

When the bar ring 43 hits the second movable plate 36, the lock nut 37 receives a signal to disengage from the screw 23a of the tie bar 23, and by the time the tie bar 23 completes its stroke, the lock nut 37 has reached the first mold opening position. It is returning to the state of time. Second mold 34 and 35
When the abutment surface B between them opens a little, the second movable plate 36 is opened at high speed by the second boost/linder 4o, and the first molds 21 and 33 also begin to open, causing the first boost/linder 4o to open the second movable plate 36 at high speed. By applying pressure oil to the cylinder 38, the first molds 21 and 33 are also rapidly opened.

As explained above, the injection molding machine of the present invention can perform simultaneous molding with one mold clamping mechanism even with multiple sets of molds, and can perform high-productivity molding with little loss time.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a conventional device, FIGS. 2 and 3 are diagrams showing an embodiment of the present invention, and FIG. 2 is a diagram showing the mold in an open state. FIG. 3 is a diagram showing the state when the mold is clamped. 2. Fixed play), 21.33. First mold, 2:
3... Tie bar, 25... Mold clamping cylinder, 26-... First moving plate, 29. 30- Injection device, 34°: (
5. Second mold, 36... Second moving plate, : 37
・ Mouth, Knut, 38...1st boost cylinder/da, 4
0...Second boost silling, 42...Tie bar movement guide shaft. Applicant: Toshiba Machine Co., Ltd. Procedural Amendment (Method) l, Indication of the case 1951 Metropolitan Patent Maro No. 66089 2, Name of the invention Injection molding machine 5, Person making the amendment Relationship with the case Patent applicant address Chuo, Tokyo Ward 11Wk 4-2-11, Tokyo, July 9, 1982 (Delivery date: July 27, 1982) 5, Full text and drawings of the specification to be amended, application form 6, contents as attached.

Claims (1)

[Scope of Claims] 1. In an injection molding machine having a mold clamping device that moves the movable plate forward and backward to clamp the mold, the movable mold is attached to the fixed plate on which the fixed die is attached, and both the fixed and movable plates An injection molding machine characterized in that one or more (other) multi-movement plates are attached between the plates, and a plurality of molds are simultaneously clamped between each plate. 2. A fixing plate that supports the mold piece of the first mold and has a mold clamping cylinder ladder attached thereto, and a hot runner plate having a nozzle and a "ch" on both sides are fixed, and a hot runner plate facing the fixing plate is fixed. a first movable plate that supports a mating mold piece that comes into contact with a mold piece of the first mold supported by the fixed plate on the plate and supports a mold piece of the second mold on the hot plate; a first boost cylinder attached to the fixed plate for moving the first movable plate forward and backward relative to the fixed plate; and a mating mold that comes into contact with a mold piece of a second mold attached to the first movable plate. A nut with a two-part opening that is attached to the tie bar so as to support the piece and to engage integrally with the screws or grooves of the tie bar, which will be described later, only during mold clamping. a second movable plate attached to the first movable plate; a second boost/ring attached to the first movable plate for moving the second movable plate forward and backward relative to the first movable plate; A piston is formed that operates within a mold clamping cylinder attached to a fixed plate, and a screw or a plurality of grooves are provided from the center of the cylinder to the other end on the opposite side of the piston with which the two-split opening and nut engage when the mold is clamped. a tie bar that guides sliding of the first and second movable plates; a support plate fixed to the other end of the tie bar; one end fixed to the support plate, and the other end fixed to the first and second recesses; l or a plurality of tie bar movement guide shafts extending through through holes provided in the movable plate and the fixed plate, and the second A stopper ring of ml larger than the through hole provided in the movable die plate and smaller than the through hole provided in the first movable die plate, and a stopper ring located closer to the fixed die plate than the stopper ring and the first movable die A second stop and a palling, which are larger than the through-hole of the plate and can be locked at any position, and the first
The injection device according to claim 1, which comprises two injection devices provided on a moving plate and two injection devices each abutting a nozzle touch portion of a runner plate, or one injection device having a plurality of nozzles. Molding machine. :U A hot runner is provided on the first moving plate,
A patented injection molding machine characterized in that injection molding is performed into the first and second molds by one or more injection devices.