JPH06226825A - Method and apparatus for clamping molds of hollow molding machine - Google Patents

Abstract

PURPOSE:To accurately mold a parison of high quality by clamping molds for hollow molding the parison provided at first and second mold mounting plates by a motor and a rotary screw. CONSTITUTION:Molds 10 provided at first and second mold mounting plates 4, 8 to hollow mold a parison 2a provided at the plates 4, 8 are clamped through mold clamping means 20. In this case, the means 20 clamps the molds by a front plate 3 provided at the plate 4, a rear plate 6 connected to the plate 3 via a tie bar 11 and a motor 33 provided at the plate 6. The motor 33 has a nut 31 engaged with a connected rotary screw 30 and provided at the plate 8. The molds 10 are clamped by the rotation of the motor 33. The plate 8 is coupled to the plate 6 via racks 40, 41 and a pinion 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for clamping a hollow molding machine, and more particularly to a novel improvement for high-accuracy and safe high-quality molding using an electric motor.

[0002]

2. Description of the Related Art Conventionally, the structure shown in FIG. 2 has been adopted as a mold clamping method and device for a hollow molding machine of this type which has been conventionally used. That is, what is indicated by reference numeral 1 in FIG. 2 is an extruder connected to the crosshead 2, and at the lower position of the crosshead 2, a first die mounting plate 4 of the front plate 3 is provided. 1 mold part 5
And a second mold part 9 of a second mold mounting plate 8 connected to the rear plate 6 via a hydraulic cylinder 7 are openably and closably provided, and the mold parts 5 and 9 constitute a mold 10. is doing.

The front plate 3 and the rear plate 6
Are connected through a plurality of tie bars 11, and the tie bars 11 are inserted in the through holes 8a of the second mold mounting plate 8.
Is operably penetrated.

The hydraulic cylinder 7 includes a hydraulic unit 1
2 is connected via a pair of throttle valves 14 and 15, and the mold 10 can be opened and closed and clamped by the operation of the hydraulic cylinder 7. The mold mounting plates 4 and 8, the hydraulic cylinder 7, the plates 3 and 6 and the tie bar 11 constitute a mold clamping means 20.

Next, the operation will be described. First, the resin extruded from the extruder 1 is guided to the crosshead 2, the pipe-shaped parison 2a is hung downward, and it is guided between the molds 10 standing by at the lower part, and when the required length is reached, the hydraulic pressure is applied. When the rod 7a of the cylinder 7 is extended, the mold 10 is closed via the mold clamping means 20 and the mold clamping is performed. At this stage, the parison 2a is cut with a cutter (not shown), the mold 10 is moved to the air nozzle (not shown) side, and when air is injected into the parison 2a by this air nozzle, hollow molding is performed in the mold 10. Done. Then, cool and mold 1
When 0 is opened, a hollow molded product is obtained.

[0006]

Since the conventional mold clamping method and device for the hollow molding machine are configured as described above,
The following issues existed. That is, if oil leaks from the hydraulic cylinders and pipes, the molded products will be contaminated, and in particular, strict maintenance is required for medical and chemical bottles. Further, it is difficult to control the operation of the hydraulic cylinder in detail and with high accuracy, and it has been extremely difficult to obtain a high-precision hollow molded product that requires high-precision mold clamping.

The present invention has been made in order to solve the above problems, and in particular, a method for clamping a hollow molding machine, which uses an electric motor to perform high-precision molding with high accuracy and safety, and The purpose is to provide a device.

[0008]

A method of clamping a hollow molding machine according to the present invention is a method of clamping a mold, which is provided on first and second mold mounting plates for hollow molding a parison, with an electric motor. This is a configuration that is performed via a screw.

In the mold clamping device of the hollow molding machine according to the present invention, the molds for hollow molding the parison provided on the first and second mold mounting plates are clamped through the mold clamping means. In the mold clamping device of the blow molding machine, the mold clamping means includes a front plate provided on the first mold mounting plate, a rear plate connected to the front plate via a tie bar, and the rear plate. It comprises an electric motor provided and a nut provided on the second mold mounting plate that is screwed into a rotating screw connected to the electric motor, and the mold is clamped by the rotation of the electric motor. It is a composition.

More specifically, the second mold mounting plate and the rear plate are connected to each other via a rack and a pinion.

[0011]

In the method and apparatus for clamping a mold of a hollow molding machine according to the present invention, an electric motor and a rotary screw are adopted as the mold clamping means. Therefore, by rotating the rotary screw through the electric motor, opening and closing of the mold and The mold can be clamped with high accuracy, and the dirt and the like on the molded product due to oil leakage can be completely avoided.
A high quality hollow molded product can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a mold clamping method and apparatus for a hollow molding machine according to the present invention will be described in detail below with reference to the drawings. In addition, the same or equivalent portions as those of the conventional example will be described using the same reference numerals. In FIG. 1, reference numeral 1 is an extruder connected to a crosshead 2, and below the crosshead 2 is a first metal mold provided on a first mold mounting plate 4 of a front plate 3. The mold part 5 and the second mold part 9 of the second mold mounting plate 8 connected to the rear plate 6 via the rotary screw 30 and the nut 31 are provided so as to be openable and closable, and the respective mold parts 5, 9 The mold 10 is composed of.

The front plate 3 and the rear plate 6
Are connected through a plurality of tie bars 11, and the tie bars 11 are inserted in the through holes 8a of the second mold mounting plate 8.
Is operably penetrated.

The rotary screw 30 is connected to a rotary shaft 33a of an electric motor 33 of the rear plate 6 via a coupling 32, and the nut 31 is a second shaft via a support 34.
The rotary screw 30 is attached to the die mounting plate 8 and is screwed into the nut 31. Therefore, the electric motor 3
The mold 10 can be opened and closed and the mold can be clamped by the operation of the mold 3.
1, the electric motor 33, the respective plates 3 and 6, and the tie bar 11 constitute a mold clamping means 20. Further, the second mold mounting plate 8 and the rear plate 6 are connected to each other by a synchronizing portion 43 including racks 40 and 41 and a pinion 42.

Next, the operation will be described. First, the resin extruded from the extruder 1 is guided to the crosshead 2, the pipe-shaped parison 2a is hung downward, and the resin is guided between the molds 10 waiting at the lower part, and when the required length is reached, the electric motor 33
When the rotary screw 30 is rotated via the
Since the respective mold parts 5 and 9 move in the direction of closing each other via 6 and the tie bar 11, mold closing and mold clamping are performed.
At this stage, the parison 2a is cut with a cutter (not shown), the mold 10 is moved to the air nozzle (not shown) side, and when air is injected into the parison 2a by this air nozzle, hollow molding is performed in the mold 10. Done. Then, it is cooled and the mold 10 is opened to obtain a hollow molded product.

[0016]

The method and apparatus for clamping a hollow molding machine according to the present invention are configured as described above, so that the following effects can be obtained. That is, the mold can be opened and closed with high accuracy by the electric motor and the rotary screw, and oil leakage unlike the conventional case does not occur, so a safe, high-quality hollow molded product free from oil stains can be obtained. Obtainable. Further, by controlling the program of the electric motor, the mold can be stopped at an arbitrary opening / closing speed and at an arbitrary position, and the mold can be accurately stopped, and it is safe because it does not malfunction due to disturbance after the stop. In addition, by turning off the motor other than the required operation after the mold is closed and opened, it is possible to save energy because it does not always operate like the motor of the hydraulic unit. Also, since the mold clamping force can be changed arbitrarily by controlling the torque of the motor, the mold clamping force that matches the size of the molded product can be used to prevent damage to the mold, improve the life, and display the mold clamping force. It is possible to improve the sex. Further, since the reproducibility at the time of molding can be measured by storing the mold clamping force, the opening / closing speed, and the stop position, it is possible to shorten the setup time, cover the operator's lack of skill, and improve the quality control. Further, even when the thickness of the mold is not constant, it is possible to apply the necessary mold clamping force with high accuracy by the electric motor for molding. Also,
Since the arbitrary speed can be varied during the mold closing and mold opening, the range of molding operations can be widened, and the quality of molded products can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a mold clamping device of a hollow molding machine according to the present invention.

FIG. 2 is a configuration diagram showing a mold clamping device of a conventional hollow molding machine.

[Explanation of symbols]

 2a parison 3 front plate 4,8 first and second mold mounting plate 6 rear plate 10 mold 20 mold clamping means 31 nut 33 electric motor 40,41 rack 42 pinion

Claims (3)

[Claims] 1. Clamping of a mold (10) provided on the first and second mold mounting plates (4, 8) for hollow molding a parison (2a),
A method for clamping a hollow molding machine, which is performed via an electric motor (33) and a rotary screw (30). 2. Clamping of a mold (10) provided on the first and second mold mounting plates (4, 8) for hollow molding the parison (2a),
In a mold clamping device of a hollow molding machine configured to perform through a mold clamping means (20), the mold clamping means (20) is a front plate (3) provided on the first mold mounting plate (4). A rear plate (6) connected to the front plate (3) through a tie bar (11), an electric motor (33) provided on the rear plate (6), and connected to the electric motor (33). Nut (3) screwed onto the rotating screw (30) and provided on the second mold mounting plate (8).
1), and the mold (1
A mold clamping device for a hollow molding machine, characterized in that the mold is clamped in (0). 3. The second mold mounting plate (8) and a rear plate
The mold clamping device for a hollow molding machine according to claim 2, wherein the (6) is connected to the rack (40, 41) via a pinion (42).