JPH0645139B2 - Molding machine clamping device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold clamping device used in a molding machine such as an injection molding machine, a die cast machine, or a press molding machine.

[Prior Art] According to Japanese Patent Laid-Open No. 63-317243, the movable plate is fixed to a mold clamping piston of a mold clamping cylinder provided on the fixed plate side and a tie bar having a screw shaft whose tip portion is provided on the movable plate side. 2. Description of the Related Art A mold clamping device for a large molding machine is known in which, after a mold is closed near a board and the mold is closed, a half nut connected to a mold piston and a tie bar screw shaft are engaged with each other to perform mold clamping.

[Problems to be Solved by the Invention] In this conventional device, it is possible to match the phase of the half nut with the screw of the tie bar simply by moving the half nut in the longitudinal direction by a small amount as set by the movement adjusting device. No. 4, pp. 6-96, only a half nut slidably supported via a bracket is pressed against a ram tip end portion by a spring, and no specific configuration is shown for fine adjustment of meshing positions of screws.

Further, in this conventional device, when the fixed die and the movable die are combined and the tip portion of the tie bar penetrates the fixed platen and stops, the connection with the half nut by meshing is performed. However, there is a problem that the mold closing speed slowdown required for mold protection cannot be performed by the mold clamping cylinder.

The present invention has been conceived in order to solve the above-mentioned conventional technical problems, and an object thereof is to easily adjust the meshing position every time the mold is replaced, and to move the mold before it is closed. By receiving the tie bar on the mold clamping piston,
It is an object of the present invention to provide a mold clamping device of a molding machine having a new structure that can slow down the mold closing speed by using the mold clamping cylinder.

[Means for Solving the Problems] The features of the invention according to the above-mentioned object are that a movable plate provided so as to be movable back and forth with respect to a fixed plate installed on a base, and a plurality of movable plates arranged at required positions of the fixed plate. A plurality of tie bars provided at the corresponding positions of the mold clamping cylinder and the mold clamping cylinder of the movable plate, the tip of which forms a screw shaft; and a mold opening / closing cylinder for moving the movable plate forward and backward with respect to the fixed plate. , A mold clamping piston in which a tie bar receiving hole is provided in the mold clamping cylinder,
A mold thickness adjusting device consisting of a tie bar stopper movably screwed into a screw cylinder extending at the rear end of the mold clamping piston, and a motor for moving the stopper forward and backward, and a chuck that meshes with the screw shaft. A pair of tie bar coupling devices provided on both sides of the mold clamping piston so as to face the hole, and a screw ring for meshing adjustment is screwed into the outer side of the inner end in the opening on the fixed plate side of the mold clamping cylinder, It is composed of a sleeve also serving as a tie bar introducing hole that is fitted in the mold clamping piston so as to be movable in the axial direction, and a receiving wall at the tip of the sleeve formed in the receiving hole of the mold clamping piston.

Another feature of the present invention is that the mold thickness adjusting device is screwed with a screw cylinder having an outer end closed and extending to a rear end of a mold clamping piston, and a screw provided on an inner wall of the screw cylinder. At the same time, the stopper of the tie bar fitted to the spline shaft from the outer end of the screw cylinder so as to be able to move forward and backward with respect to the receiving hole, and the servo motor at the outer end of the screw cylinder for rotating the spline shaft and the adjustment bolt for the stopper It consists of and.

Another feature of the present invention is that the mold clamping cylinder is provided on the movable plate side and the tie bar is provided on the fixed plate side.

[Operation] In the above configuration, when the sleeve is fed into the inside, the tip of the sleeve abuts the receiving wall to move the mold clamping piston along the screw shaft. As a result, the chuck also moves relative to the screw surface of the screw shaft, so that the sleeve can match the meshing position of the screw shaft and the chuck.

When the movable platen moves forward with respect to the fixed platen, the screw shaft of the tip portion of the tie bar enters the mold clamping piston, and the tip surface hits the stopper in the screw cylinder before the mold closing is completed. As a result, the tie bar is received by the mold clamping piston via the stopper, and as a result of moving together with the mold clamping piston, the mold closing speed slows down. During this slowdown, the screw shaft is stationary with respect to the chuck,
The tie bar and the mold clamping piston are connected by meshing until the mold is completely closed.

[Embodiment] In the figure, reference numeral 1 is a fixed board placed on one side of a base 2, and 3 is a movable board provided on the base 2 so as to be movable with respect to the fixed board 1.

Reference numeral 4 denotes a mold opening / closing cylinder, in which a cylinder 4a is fixed to the fixed platen side and a rod 4b is fixed to the movable platen side.

Mold clamping cylinders 5 are integrally provided outside the four corners of the fixed platen 1. In the opening of the mold clamping cylinder 4 on the stationary plate side, there is provided a sleeve 7 which also serves as a tie bar insertion hole into which a screw ring 6 for meshing engagement is screwed on the outer periphery of the inner end, as shown in FIG. 6 is fixed to the opening edge by a bolt 6a, and is rotatably and movably fitted into the mold clamping cylinder 5.

The mold clamping cylinder 5 is a cylinder 8 integrated with the fixed platen 1.
And a sleeve 10 for receiving the tie bar 9 on the movable plate side together with the sleeve 7 is axially penetrated, and a receiving wall 7a at the sleeve tip is formed inside the receiving hole 10
A mold thickness adjusting device 12 at the rear end of the mold clamping piston, and a coupling device 13 for the tie bar 9 on the side of the mold clamping piston.

The mold thickness adjusting device 12 is screwed with a screw cylinder 14 having an outer end closed and extending to the rear end of the mold clamping piston 11, and a screw provided on the inner wall of the screw cylinder 14, and From the stopper 16 fitted to the spline shaft 15 from the end and positioned so as to move back and forth with respect to the receiving hole 10, the servo motor 17 at the outer end for rotating the spline shaft 15 and the adjusting bolt 18 of the stopper 16. It is configured.

The coupling device 13 includes a cylinder 19 integrally provided on both sides of the mold clamping piston 11, and a piston rod 20.
Connected to the tip of the tie bar receiving hole 10 and housed in the annular recess 21 inside the tie bar, and is constituted by a half-nut-shaped chuck 22 facing the receiving hole 10, and the cylinder 19 is located on the mold clamping cylinder side. The long hole 23 provided in the cylinder 8 moves together with the mold clamping piston 11.

The tie bars 9 are horizontally provided at the four corners of the movable plate 3 at positions corresponding to the mold clamping cylinders 5. Each tip of each tie bar 9 is formed on a screw shaft 24 that meshes with the screw teeth of the chuck 22.

The screw shaft 24, the screw teeth of the chuck 22, and the screws of the screw cylinder 14 are all of the same pitch.

In the figure, 25 is an insertion hole for the spline shaft 15 formed in the center of the screw shaft 24, 26 is a limit switch for confirming the retreat limit of the stopper 16, 27 is a rotary encoder,
28 is a fixed mold, and 29 is a movable mold.

Further, in the above embodiment, the mold clamping cylinder 5 is provided on the fixed platen side and the tie bar 9 is provided on the movable platen side. However, if necessary, the mold clamping cylinder 5 is provided on the movable platen side and the tie bar 9 is provided on the fixed platen side.
May be provided.

Next, the mold thickness adjustment will be described with reference to FIGS. In addition, the screw of each part in the drawing shows only a cross section. Further, the screw of the screw cylinder 14 has 8 pitches, and the other screws are also provided according to this pitch.

In this mold clamping device, the original position of the stopper 16 is set, and the position of the stopper 16 with respect to the tie bar 9 is adjusted with reference to this original position.

As shown in FIG. 5, the setting of the original position is performed by attaching the mold 30 having the minimum mold thickness to the fixed platen 1 and the movable platen 3. First, after closing the mold, a slight deviation in the meshing position between the chuck 22 and the screw shaft 24 is adjusted. This adjustment is sleeve 7
Can be easily carried out by rotating and feeding the inside and moving the chuck 22 together with the mold clamping piston 11.

Next, the motor 17 rotates the spline shaft 15 to feed the stopper 16 and bring it into contact with the end surface of the screw shaft. After the motor 17 has stopped, the bolt 18 is extended and the stopper 16
Then, the position is set as the original position of the stopper 16, and the proximity switch 26 for confirming the backward limit is set to operate at this position.

As shown in FIG. 6, the die thickness adjustment accompanying the die replacement is performed after a new die 30a is attached.

First, the mold is closed and the screw shaft 24 of the tie bar 9 is inserted into the mold clamping piston 11. After that, the stopper 16 lowered to the original position is moved by the motor 17 and abuts on the end surface of the screw shaft as shown in FIG.

Next, in order to set the slowdown distance of the mold clamping speed, the mold 30a is opened by the required dimension L ₁ as shown in FIG. Due to this mold opening, the tie bar 9 is also retracted, and the screw shaft end surface is separated from the stopper 16 by the same dimension L ₁ . This dimension L ₁ is the slowdown distance.

After adjusting the meshing position by the sleeve 7, the motor 16 again moves the stopper 16 to the end surface of the screw shaft and abuts it. By this abutment, the tie bar 9 is received by the mold clamping piston 11 via the stopper 16 before the mold is closed, and the distance until the mold is closed is determined by the mold clamping piston 1.
Will move with 1.

In addition, since the meshing position has already been adjusted in the state of being in contact with the stopper 16, the chuck 22 can be moved forward during the slowdown to engage with the screw shaft 24 by meshing, and immediately after the mold is closed. It is possible to shift to strong mold clamping.

In the mold clamping device whose mold thickness is adjusted as described above, when the opening / closing cylinder 4 is hydraulically operated in the mold open state shown in FIG. 1, the movable platen 3 moves at a high speed in the direction of the fixed platen 1 to close the mold. Go.

As shown in FIG. 3, the tie bar 9 is moved by the forward movement of the movable platen 3.
The screw shaft 24 at the tip end of the slab enters the inside of the mold clamping piston 11 from the sleeve 7 and comes into contact with the stopper 16 positioned in advance from the thickness of the mold before the mold is completely closed,
It can be received by the mold clamping piston 11. As a result, the mold clamping piston 11 moves to the mold closing completed position together with the tie bar 9 while discharging the hydraulic oil on the rear oil chamber side, so that the mold closing speed slows down.

Further, since the screw shaft 24 of the tie bar 9 faces the pair of chucks 22 of the coupling device 13 in a stationary state due to the contact with the stopper 16, when the cylinder 19 is hydraulically operated after the slowdown, the chuck 22 is moved. Is pushed out and meshes with the side surface of the screw shaft of the tie bar 9.

When this engagement is sensed by a limit switch or the like and the completion of mold closing is confirmed, as shown in FIG. 4, hydraulic oil is supplied to the front oil chamber 31 and high-pressure mold clamping is performed there.

When the molding is completed, hydraulic oil is supplied to the rear oil chamber 32,
The hydraulic oil in the front oil chamber 31 is discharged by the mold clamping piston 11, and strong mold opening is performed there. Then, the engagement is released after the strong mold opening, and the mold opening / closing cylinder 4 opens the mold.

EFFECTS OF THE INVENTION As described above, according to the present invention, the sleeve 7 is screwed into the fixed plate side opening of the mold clamping cylinder 5 and is fitted axially movably into the mold clamping piston 11. With the receiving wall 7a at the sleeve tip formed inside the receiving hole 10 of the mold clamping piston 11, the chuck 22 is moved together with the mold clamping piston 11 with respect to the screw shaft 24 so that the meshing position of the screw can be adjusted. Therefore, the meshing position can be easily set during die replacement, and even a slight displacement can be corrected by a slight movement of the sleeve, so that damage to the screw due to poor meshing can be prevented.

Further, the tie bar 9 is provided by the die thickness adjusting device 12 including the stopper 16 of the tie bar 9 movably screwed into the screw cylinder extending to the rear end of the die clamping piston 11 and the motor 17 for moving the stopper 16 forward and backward. Is linked to the mold clamping piston 11 during the movement so that the slowdown distance can be set, so that the steps from high-speed mold closing to strong mold clamping can be continuously performed.

Furthermore, the adjusting bolt 18 of the stopper 16 is provided on the outer end of the screw cylinder 14 of the mold thickness adjusting device 12 so that the original position of the stopper 16 can be set. It has features such as the ability to control the movement amount of the stopper 16.

[Brief description of drawings]

The drawings show an example of a mold clamping device of a molding machine according to the present invention. FIG. 1 is a side view showing a mold clamping cylinder part in a vertical section, and FIG. 2 is a sectional view of a sleeve part for adjusting engagement. Third
FIG. 4 is a partial cross-sectional view showing the state immediately before mold closing, FIG. 4 is a partial cross-sectional view showing the high-pressure mold clamping state, FIG. 5 is a partial cross-sectional view explaining the original position setting of the stopper, and FIGS. FIG. 6 is a partial cross-sectional view for explaining adjustment of a meshing position and a stopper position accompanying die replacement. 1 ... Fixed board, 2 ... Base 3 ... Movable board 4 ... Mold opening / closing cylinder, 5 ... Mold clamping cylinder, 6 ... Screw ring, 7 ... Sleeve, 8 ... Cylinder, 9 ... Tie bar, 10 ... Tie bar receiving hole, 11 ...... Mold clamping piston 12 ...... Mold thickness adjusting device, 13 ...... Coupling device 14 ...... Screw cylinder, 15 ...... Spline shaft 16 ...... Stopper, 17 ...... Motor 18 ...... Adjusting bolt, 22 …… Half nut 24 …… Screw shaft

Claims (3)

[Claims] 1. A movable plate, which is provided so as to be movable back and forth with respect to a fixed plate installed on a base, a plurality of mold clamping cylinders arranged at required positions of the fixed plate, and a mold clamping cylinder of the movable plate. A plurality of tie bars whose tip is formed on the screw shaft at positions corresponding to, a mold opening / closing cylinder that moves the movable platen back and forth with respect to the fixed plate, and a tie bar receiving hole in the mold clamping cylinder. A mold thickness adjusting device comprising a mold clamping piston having a penetrating body, a tie bar stopper movably screwed into a screw cylinder extending at the rear end of the mold clamping piston, and a motor for moving the stopper forward and backward. A pair of tie bar coupling devices provided on both sides of the mold clamping piston with a chuck that meshes with the screw shaft facing a receiving hole, and a screw ring for meshing adjustment in an opening on the stationary plate side of the mold clamping cylinder. By screwing the A sleeve serving as a tie bar introduction hole fitted movably in the axial direction to within tons clamping device of a molding machine, characterized in that comprising a receiving wall of the sleeve distal end formed inside said receiving hole. 2. The mold clamping device for a molding machine according to claim 1, wherein the mold thickness adjusting device includes a screw cylinder having an outer end closed and extending to a rear end of the mold clamping piston, and an inner side of the screw cylinder. A tie bar stopper that fits with the screw on the wall and fits with the spline shaft from the outer end of the screw cylinder, and is positioned so that it can move back and forth with respect to the receiving hole, and the outside of the screw cylinder that rotates the spline shaft. A mold clamping device for a molding machine, comprising an end servomotor and a stopper adjusting bolt. 3. The mold clamping device for a molding machine according to claim 1, wherein the mold clamping cylinder is provided on a movable platen side and a tie bar is provided on a fixed platen side, respectively.