A mold clamping device and an operating method of the mold clamping device

Abstract

Provided is a mold clamping device by using a mold clamping pressure cylinder, capable of rapidly moving the mold clamping pressure cylinder toward two directions without size maximization of pumps or valves in a liquid pressure loop so as to shorten a period after clamping a locknut and a locking part. The mold clamping device (12), in which a movable metal mold (20) is close to or conjoined to a fixed metal mold (15) by a mold switching mechanism (26) and the mold is clamped by the mold clamping pressure cylinder (22) after clamping the locknut (29) and the locking part (25), is provided with a first pressure cylinder chamber (38) for mold clamping, a second pressure cylinder chamber (39) and a third pressure cylinder chamber (41) which pressure-receiving areas are less than that of a first pressure cylinder chamber (38), by using a mold clamping piston (32) of a mold clamping pressure cylinder (22) as a boundary.

Description

technical field [0001] The present invention relates to a mold clamping device and a mold clamping device which closes or abuts a movable metal mold relative to a fixed metal mold by a mold opening and closing mechanism, locks a half nut and a locking part, and performs mold clamping by a mold clamping pressure cylinder. The operation method of the model device. Background technique [0002] As a mold clamping device used in an injection molding machine, there are devices that perform mold opening and closing and mold clamping by the same mechanism like a toggle mechanism, and devices that allow a movable metal mold to approach or touch a fixed metal mold by a mold opening and closing mechanism. A mold clamping device that is connected to the mold clamping pressure cylinder after the half nut is locked with the locking part. The structures described in Patent Document 1 to Patent Document 5 are known as the latter type using a half nut and a mold clamping cylinder. of Pate...

AI Technical Summary

Problems solved by technology

[0010] Although the techniques of the above-mentioned Patent Document 4 and Patent Document 5 have a structure in which the first pressure cylinder chamber of the mold clamping side of the mold clamping pressure cylinder communicates with the second pressure cylinder chamber of the mold opening side, etc., due to Both the mold clamping side and the mold opening side do not have small-diameter pressure cylinder chambers, so when the mold clamping pressure cylinder is moved in both directions, it cannot be moved with a small flow rate of hydraulic oil, and the supply of hydraulic oil to the oil chamber is expensive. time, so the total forming cycle time cannot be shortened

Alternatively, if the total molding cycle time is to be shortened, it is necessary to prepare a pump or valve of the hydraulic circuit in a structure capable of supplying a large amount of hydraulic oil in a short time, and the above-mentioned hydraulic circuit cannot be compacted.

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