JPS62151312A - Mold clamping device for multistage mold - Google Patents

Abstract

PURPOSE:To enable high speed mold clamping with a small power source, by a method wherein a plurality of stages of movable platens and molds are actuated by a small cylinder rod and the mold clamping is divided into a tentative mold clamping and main mold clamping by a small stroke of a cylinder ram. CONSTITUTION:Tentative mold clamping is applied to mold clamping parts, which are A, B, C, D respectively, independently or in an interlocking state by so constituting the titled device that small cylinder rods 11', 12', 13' are fitted respectively in small cylinders 11, 12, 13 arranged on both ends of each of movable platens 2, 3, 4 and second, third and fourth stage movable platens are clamped or broken in order by a rod screwed into a first stage movable platen 1. In this case the titled device requires only a small power source as the same is enough with only transfer force based on empty weights of movable platens 1, 2, 3, 4 sliding a tie bar 7 and male and female molds 9, 10. As for final mold clamping, when the same is performed with mold clamping force by small stroke of about 1-2mm of a ram (a') of a central cylinder (a) of a mold clamping device, generation of a noise is little and clamping and braking of the mold can be performed swiftly with the small power source.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a mold clamping device (two movable platen) for use in an injection molding machine using a multi-stage mold. This invention relates to a mold clamping device for an injection molding machine in which small cylinder rods for temporary mold clamping are respectively arranged to reduce noise generation even during high-speed mold clamping.

[Prior art]

Conventionally, two types of mold clamping devices have been mainly used for injection molding machines: a torque type and a direct pressure type. The former had many rotating parts and maintenance management such as lubrication (two problems).The latter had the disadvantage of slow mold clamping speed compared to the former, but also had the advantage of superior durability.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks, and also performs temporary mold clamping and main mold clamping using separate hydraulic power sources, reduces the contact noise during mold clamping, and furthermore reduces the contact noise during mold clamping. The present invention aims to provide a mold clamping IW that can perform the mold clamping device at high speed.

[Summary of the invention]

The mold clamping device of the present invention is configured to perform main mold clamping and temporary mold clamping separately, and a plurality of small cylinder rods for temporary mold clamping are disposed on the shoulders of the cylinder for main mold clamping, and are connected through tie bars. A plurality of movable plates and a plurality of molds constitute one press body between the fixed platen and a plurality of sets of molds (two male and female) are connected to a small cylinder rod (two to one individual (two to two)). It is characterized by being able to open and close at once in conjunction with each other.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 showing an embodiment of the present invention is a plan view of a molding machine with the mold clamping device opened, and FIG. 2 is a partial plan view of FIG. 1 with the mold closed.

The ram a' fitted into the wooden mold clamping cylinder a1 is fixed via the flange 5 of the first movable group 1, and
．． Four-stage movable plates 2, 3, 4, etc. and multiple stages of movable plates and molds are arranged, and the overlapping large mold is connected to the shoulder of cylinder a (double-chain tie bar) by tie bar 7 at the fixed plate 6 at the end of the mold clamping device. The ends of 7 are screwed 8 to form a press body, and the press body has a male die 9 and a female die 10 between each movable platen 1.2, 3.4 and the fixed platen 6 at the end. The multiple molds (four stages in the illustration) can be opened and closed individually (two prongs are interlocked), and the molds are stacked in four stages under limited mold clamping force, making it four times more efficient than before. It has molding ability.

Small cylinders 11, 12 arranged at both ends of each movable platen,
13 have small cylinder rods 11, 12, and 13, respectively.
The movable plates 2, 3, and 4 of stages 2, 3, and 4 are sequentially opened and closed by a rod screwed into the first stage movable plate 1. A, B, 0 respectively. The mold clamping portions D are temporarily clamped individually and in conjunction with each other. Also, the molds can be clamped all at once in conjunction with each other.

In this case, the generation of noise during mold clamping requires only the opening and closing force of the mold as the individual mold clamping force. 9 males and 10 females each
The mold requires only the transfer force of its own weight. Therefore, only a small power source is required. That is, it is sufficient to simply supply low pressure oil (50 kti/ca) to the small cylinders 11, 12, 13 using a pen pump, gear pump, etc. (not shown). Therefore, the noise of the pump and the contact noise during mold clamping are also reduced.

As mentioned above, the power source is also small. Each stage mold clamping part A
, B, C, and D are temporarily clamped using small cylinders 11, 12, and 13.
+=If the small cylinder rods 11, 12, and 13 are inserted, the speed will be increased. If the final mold clamping force is about 1 to 2 small strokes of the ram l of the central cylinder a of the mold clamping device, high-speed mold clamping can be achieved using the small cylinder rod 11 mentioned above.
Each movable platen 2, 3 equipped with ', 12', 13'
．． 4. The stacking mold can be opened and closed at high speed,
The actual mold clamping can be performed by advancing the ram a'. Because of the above, less noise is generated, and the mold can be opened and closed at high speed with a small power source.

〔Effect of the invention〕

The small cylinder rod can be operated at high speed with multiple movable plates and molds using a small power source, and the main mold clamping can be used for the above-mentioned temporary mold clamping and main mold clamping using the small hole of the cylinder ram. Separately, final mold clamping can be done using a small cylinder rod and ram. Furthermore, the power source used is small, high-speed mold clamping is possible, and contact noise during mold clamping is low. Also, by using multi-stage molds, the molding capacity is multiple times that of conventional molds.

[Brief explanation of drawings]

No. 11, showing an embodiment of the present invention, is a mold clamping device (2) A plan view showing a state in which a plurality of movable plates and several sets of molds are arranged and the mold is opened. A partially vertical plan view showing the mold in a closed state.a is the cylinder, a is the ram 1 is the first stage movable plate, 2 is the second stage movable plate 3 is the third stage movable plate, 4 is the third stage movable plate. The fourth stage movable platen 6 is a fixed plate, and 9 is a male type.

Claims (1)

[Claims] A plurality of sets of molds are arranged between a fixed platen and a movable platen, in which a plurality of movable plates and a plurality of molds are stacked, and each movable platen has a small cylinder for temporary mold clamping, A multi-stage mold characterized in that a small cylinder rod is arranged so that one or more sets of molds can be opened and closed individually or all at once, and the main mold clamping is performed by a cylinder ram at the rear of the mold clamping device. mold clamping device.