JP2767316B2 - Mold clamping device in injection molding machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping portion of a molding machine using a mold,
The present invention relates to a mechanism for adjusting parallelism between a stationary platen and a moving platen in a mold clamping unit.

Prior art In the mold clamping part of a molding machine using a mold, the parallelism between the stationary platen that fixes the fixed mold and the moving platen that fixes the movable mold is important, and this is within the allowable value. If it is not maintained, the mold will be twisted at the time of mold clamping to damage the mold, or the mold clamping force will be non-uniform, causing burrs on the molded product.

Normally, the moving platen is arranged parallel to the stationary platen.However, the moving platen may be out of order due to the installation conditions at the time of delivery or temperature changes during molding work, or may be affected by the weight of the movable side mold attached. , The center of gravity of the entire moving platen may be displaced from a substantial support point of the platen with respect to the base, which may cause the platen to tilt and lose parallelism.

In order to cope with such inconsistency, the eccentric cam rollers are arranged between the base and the lower left and right sides of the moving platen and rotated to correct the inclination of the moving platen or to support the moving platen. For example, a shim is interposed between the platen supporter and the base to correct the inclination of the platen.

However, it is necessary to lift the moving platen with a crane or the like in order to rotate the eccentric cam roller or sandwich the shim, and it is difficult for the purchaser to perform such work at the destination of the molding machine. There is a side.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanism that can easily correct the inclination of a moving platen.

Means for Solving the Problems A stationary platen and a rear platen on the base and a moving platen are provided between the stationary platen and the rear platen, and a fixed side mold attached to the stationary platen and a movable side mold attached to the moving platen are abutted to form a mold. The following configuration is adopted in an injection molding machine having a mold clamping portion for clamping.

Support the left and right sides of the moving platen on the platen support.

The platen support has one roller that rolls on the base.

The roller can move its position in the front-rear direction with respect to the platen.

The roller is arranged and fixed such that the point of contact with the base and the center of gravity of the entire moving platen to which the movable mold is fixed are included in the same vertical plane.

The roller moves back and forth, and the point of contact with the base, that is, the substantial support point of the moving platen, is set immediately below the center of gravity of the moving platen with the movable die attached.

Embodiment 2 FIG. 2 shows a mold clamping unit 1 of an injection molding machine, which includes a stationary platen 2, a moving platen 3 and a rear platen 4. The stationary platen 2 and the rear platen 4 are connected by four tie bars 5, The moving platen 3 is mounted on these tie bars 5 so as to be movable back and forth.

The stationary platen 2 is fixed to a base 6 with bolts or the like, and a fixed mold 7 is fixed to a mold mounting surface thereof. Moving platen 3 is lower platen support 8
Movably supported on the base, and the movable mold 9 is mounted on the mold mounting surface thereof. Further, the rear platen 4 is mounted to be slightly movable back and forth for die height adjustment.

Reference numeral 10 denotes a mold clamping servomotor, and reference numeral 11 denotes a mold clamping mechanism.

The platen supports 8 are arranged on the lower left and right of the moving platen 3 as shown in FIGS.
It has one roller 12 that rolls on it.

As shown in FIG. 1, the roller 12 has its rolling shaft 13 supported by a longitudinal hole 15 provided in the body 14 of the platen support 8 in the front-rear direction. The arm 17 is connected. That is, the main body 14 is fixed to the lower portion of the moving platen 3 with bolts or the like, but the position of the roller 12 can also move in the front-rear direction with respect to the moving platen 3. The roller moving device 16 is a main body of the platen support 8.
A drive motor 21 in which a speed reducer 19 and a brake device 20 are assembled is attached to a machine frame 18 fixed to 14, and a ball nut 22 of a ball screw / nut mechanism is rotatably mounted on a shaft.
A gear fixed to the outer periphery of the ball nut 22 meshes with a gear of the output shaft of the speed reducer 19. The ball screw 23 of the ball screw / nut mechanism has a tip formed on the drive arm 17, and the roller 12 can push and pull the rolling shaft 13 back and forth. The pitch of the screw and nut in the ball screw / nut mechanism is set small.

The brake device 20 is a negative-acting electromagnetic brake that releases a braking force when electric power is supplied.

The power supply to the left and right roller moving devices 16 can be switched on and off individually using switches on an operation panel provided in the injection molding machine.

Now, as shown in FIG. 4, when the moving platen 3 to which the movable mold 9 is fixed is tilted to the left as indicated by the axis a, the center of gravity G of the platen 3 is set between the roller 12 of the platen support 8 and the base 6. It is considered to be behind the contact point P, and at this time, the ball nut 22 is rotated forward by the roller moving device 16 to push out the ball screw 23 and the drive arm 17 at the tip thereof to move the roller 12 backward, The center of gravity G and the contact point P are included in the same vertical plane b.

This operation is performed by turning on and off the drive motor 21 from the operation panel of the injection molding machine, and when the drive motor 21 is driven,
The brake device 20 is excited and the braking force is released. When the drive motor 21 is stopped, the operation of the brake device 20 is released, and a braking force acts on the motor shaft. This operation is performed on each of the left and right sides of the moving platen 3. Whether the inclination of the platen 3 is corrected or not is determined by measuring the distance between the stationary platen 2 and the moving platen 3 using an appropriate measuring device such as an inner micrometer. It is determined by measuring along the tie bar 5 of the book.

Conversely, when the center of gravity G is on the right, the drive motor 21 is rotated in the reverse direction, the ball screw 23 is pulled, and the drive arm 17
To move forward.

Thus, when the contact point P of the roller 12 with the base 6 enters the vertical plane including the center of gravity G, the moving platen 3 stands upright and is parallel to the stationary platen 2. If the operation of the roller moving device 16 is stopped at this time, the position of the roller 12 is maintained by the brake device 20.

Moreover, the operation is simple and no special equipment such as a crane is required. Further, since the contact point between the roller 12 and the base 6 is on the same vertical plane as the center of gravity of the entire moving platen 3, a moment for tilting the moving platen 3 does not act on the moving platen 3, and the moving platen 3 is stably translated. Can be done.

FIG. 5 shows a second embodiment, in which a platen support 8 is provided.
The main body 12 is attached to the lower portion of the moving platen 3 via a long hole 24 with a bolt 25, and the rolling shaft 13 of the roller 12 is supported at a fixed position of the main body 14.

In this example, the roller 12 is moved back and forth by loosening the bolt 25 and hitting one end of the main body 14 with a hammer to move the entire platen support 8 back and forth.
Move back and forth with respect to.

After the movement, the bolt 25 is tightened to maintain the position of the roller 12.

Reference numeral 26 denotes a slide plate in which oil-less metal or solid lubricant is embedded, and is interposed in a sliding contact portion between the platen support 8 and the moving platen 3.

FIG. 6 illustrates the third embodiment. In the structure of the second embodiment, the main body 14 is moved by tapping a block 27 provided to protrude downward from the moving platen 3 and engaging the front end thereof with a flange. The adjustment bolt 28 is screwed, and the flange is rotatably engaged with the main body 4.

Therefore, in this example, the main body 14 can be moved back and forth together with the roller 12 by loosening the bolt 25 fixing the main body 14 and turning the adjustment bolt 28 with a tool.

The adjusting bolt 28 forms a worm gear at the tip and meshes with a worm 29 driven by an electric motor as shown by a broken line, whereby the position of the roller 12 is moved by power similarly to the first embodiment. Can be adjusted.

 The above is the embodiment.

In the second embodiment, the main body 14 of the platen support 8 is
A rack may be formed on the upper surface of the main body 14 and the pinion on the moving platen side meshed with the rack may be manually or electrically driven to move the main body 14 back and forth.

The distance between the stationary platen 2 and the moving platen 3 is detected by an automatic measuring device such as a laser measuring device.
It is also possible to determine 12 positions automatically.

Effect of the Invention The inclination of the moving platen can be easily corrected, and the deviation of the parallelism with the stationary platen can be easily corrected in a timely manner. In addition, the moving platen after the correction has a stable parallel movement and is smooth.

[Brief description of the drawings]

1 is a front view of a main part, FIG. 2 is a front view, FIG. 3 is a side view, FIG. 4 is a front view for explaining operation, and FIG. 5 is a front view of a main part in the second embodiment. FIG. 6 is a front view of a main part in the third embodiment. 2 moving platen, 6 base, 8 platen support, 12 rollers, 16 roller moving device.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/64-45/68 B29C 45/76-45/82 B29C 33/20-33/24 B22D 17 / 26

Claims (1)

(57) [Claims] 1. A stationary platen and a rear platen on a base and a moving platen between the stationary platen and the rear platen, and a fixed mold attached to the stationary platen and a movable mold attached to the moving platen are abutted and clamped. It has a mold clamping part, supports the left and right sides of the moving platen on the platen support, and the support has one roller that rolls on the base, and the roller moves its position in the front-back direction with respect to the moving platen Wherein the point of contact of the roller with the base and the center of gravity of the entire moving platen to which the movable mold is fixed are fixed at a position included in the same vertical plane. Tightening device.