JPS58107258A - Die clamping device for molding machine - Google Patents

Abstract

PURPOSE:To allow toggle mechanisms to follow up the change in die height satisfactorily without laborious nut adjustment in a toggle type die clamping device, by providing die clamping cylinder continuous to the toggle mechanism to the stationary plate on the upper side of a molding machine. CONSTITUTION:A movable plate 4 which is freely slidable along tie rods 2 is provided between a base plate 1 and a stationary plate 3 continuous to said plate by means of said rods 2. Top and bottom dies 5, 6 which are provided to the plates 1, 4 and face each other are opened and closed by means of a cylinder 8 actuated by an oil hydraulic source 11 via toggle mechanisms 7 interposed between the plates 4 and 3, whereby the dies are made freely clampable. Here, die clamping cylinders 13 which support the fulcrums 7a in the end parts of the mechanisms 7 are provided to the plate 3, and a relief valve 16 which is opened by predetermined high pressure is interposed in an oil feed line 15 communicating with the source 11 through a check valve 14. Then, in the stage of die clamping operation, the cylinders 13 are held at the prescribed die clamping pressure, so that the mechanisms 7 deal satisfactorily with the change in the thickness of the dies according to the change in the temp. of the dies 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold clamping device for a casting machine or other molding machine.

Conventionally, as this type of device, a movable plate that can freely slide up and down along the rod (1L) is provided between the lower board and the upper fixed plate connected to it via a tie rod, and the movable plate and An upper mold and a lower mold are provided which face each other to the substrate, and both molds are opened and closed mutually by a mold opening/closing cylinder via a trouble mechanism interposed between the movable plate and the fixed plate to clamp the mold. There are known types of wire toggle mechanisms, but in this case, the line toggle mechanism must be able to be adjusted in response to changes in mold thickness due to temperature changes in both molds. Generally speaking, the nut is adjusted, and the operation is inevitably troublesome.

The object of the invention is to obtain a device free of such inconveniences, and it is an object of the present invention to provide a device along the rod between the lower substrate and the upper fixing plate connected thereto via tie reds. A trouble mechanism in which a movable plate that can freely slide is provided, and an upper mold and a lower mold are provided that face each other between the movable plate and the substrate, and both molds are interposed between the movable plate and the fixed plate. In the type in which the mold can be freely clamped by mutually opening and closing with a mold opening/closing cylinder via a check pulp, the fixing plate is provided with a mold clamping cylinder that supports a fulcrum at the end of the trouble mechanism, and this is connected via a check pulp. A relief pulp that opens at a predetermined high pressure is provided in an oil supply path communicating with a hydraulic pump or other hydraulic power source to maintain the inside of the cylinder at a predetermined mold clamping pressure.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, (1) indicates the lower board, and the board (1) is provided with a fixing plate (3) on the upper side connected to this via tie rods (2), and the iron rod is attached to the lower side of the board (1). (2)
(2) includes a movable plate (4) that can freely slide up and down;
An upper mold (
5) and a lower mold (6) are vertically moved via a trouble mechanism (7) interposed between the movable plate (4) and the fixed plate (3). The molds can be opened and closed mutually by a type yM opening/closing cylinder 8) that extends over the length of the mold, so that the mold can be clamped freely. The cylinder (8) is of a type that is fixed to the fixing plate (3) so as to protrude upward, and cooperates with the trouble mechanism (7) by a piston rod (9) that slides downward. is a hydraulically operated type, that is, a hydraulic power source consisting of an oil pump Ql connected to an oil tank 0ω is prepared, and this is connected to the upper and lower oil chambers of the cylinder (8) via a switching valve a2. 8a) The cylinder (8) is connected to the cylinder (8a) in a switchable manner so as to provide vertical movement to the cylinder (8).

Although the above is not particularly different from the conventional one, according to the present invention, the fixing plate (3) is attached to the fulcrum (7) at the end of the trouble mechanism (7).
a) Inside the mold clamping cylinder 03 that supports the check pulp Q41, the oil supply path 051 that communicates with the above-mentioned hydraulic power source←υ opens at the scheduled high pressure +) -7/(Luff Qi 'E Intervention) In this way, the inside of the cylinder is maintained at a predetermined mold clamping pressure during the mold clamping operation.That is, the trouble mechanism (7) is activated to close the upper mold (5) and the lower mold (6). ) are mutually clamped, the oil pressure in the cylinder 0 that supports the fulcrum (7a) at the end thereof is always kept at a predetermined high pressure by the relief pulp <161,
In this way, both molds (5) (6) are automatically obtained when a predetermined mold clamping pressure is applied to them.
1 is opened, the inside of the cylinder 03 is supplied with pressure oil through the oil supply path Q51, and in this case, the pressure oil is maintained at a predetermined pressure by the relief pulp aD on the upstream side of the oil supply path Q51. shall be provided. In the illustrated model, the mold clamping cylinders are arranged side by side on the fixed plate (3) in pairs at the front and rear, resulting in a total of four cylinders, and these cylinders are arranged in parallel on the fixed plate (3).
51 in parallel to each other on the downstream side.

In this way, according to the present invention, the mold clamping cylinder P that supports the fulcrum at the end of the trouble mechanism is used, and the pressure inside the cylinder P can be set to a predetermined pressure using the relief pulp. It is possible to follow changes in mold thickness, that is, changes in die hide, and has the effect of not having the above-mentioned disadvantages of the conventional type of tie rod that adjusts with a nut at the end.

[Brief explanation of the drawing]

Figure 1 is a front view-1 of an example of a molding machine equipped with the device of the present invention.
Figure 82 is its hydraulic circuit diagram. (1)... Board 12x2)... Tie rod [3) --- Fixed plate (4)... Movable plate +5 x 6)... Mold (7)... Trouble mechanism (8)... Mold opening/closing cylinder aυ...-Hydraulic pressure source (7 &) φ/Fully point (L3@curvature/mold clamping cylinder α/I-Check pulp a maximum...Lubrication Road block--2 people outside of relief pulp

Claims (1)

[Claims] A movable plate that is slidable along the rod is provided between the lower base plate and the upper fixed plate connected thereto via tie reds, and the movable plate and the base plate are opposed to each other. The mold is equipped with an upper mold and a lower mold, in which both molds can be opened and closed mutually by a mold opening/closing cylinder via a trouble mechanism interposed between the movable plate and the fixed plate, so that the mold can be freely clamped. , the fixing plate is equipped with a mold clamping cylinder that supports the fulcrum of the end of the trouble mechanism, and a relief pulp that opens at the expected high pressure is connected to the oil supply path that communicates with the hydraulic pump or other hydraulic power source via the check pulp. A mold clamping device for a molding machine, which is configured to maintain the inside of the cylinder at a predetermined mold clamping pressure.