JPS5929355B2 - Molding machine mold clamping device - Google Patents

Description

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

Conventionally, in this type of device, a movable plate that can freely slide up and down along the rod is provided between a lower mold base plate and a fixed plate on the upper side connected to the base plate via a tie rod, and a movable plate is provided between the movable plate and It is equipped with an upper mold and a lower mold that face each other with the substrate, and can be freely clamped by opening and closing both molds with a mold opening/closing cylinder via a toggle mechanism that intervenes between the movable plate and the fixed plate. However, in this case, the toggle mechanism must be adjustable in response to changes in mold thickness due to temperature changes in both molds, and the means for this is, for example, a nut at the end of the tie rod. It is generally intended to be adjusted, and the operation is inevitably troublesome.

It is an object of the present invention to provide a device free from such inconveniences, in which a device is provided between a lower substrate and an upper fixing plate that is connected to this via a tie rod. A movable plate is provided, and the movable plate and the substrate are provided with an upper mold and a lower mold facing each other, and both molds are moved through a toggle mechanism interposed between the movable plate and the fixed plate. In a type in which the mold can be freely clamped by mutually opening and closing with a mold opening/closing cylinder, a fulcrum at the end of the toggle mechanism is supported on the fixed plate.
The mold clamping cylinder is equipped with a relief valve that opens at a predetermined high pressure in the oil supply path that communicates this with a hydraulic pump or other hydraulic power source via a check valve to maintain the inside of the cylinder at the predetermined mold clamping pressure. It is made like this.

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 connected to the tie rod 2.
, 2 on the upper side thereof, and a movable plate 4 on the lower side thereof that can freely slide up and down along the rods 2, 2, the movable plate 4 and the substrate. 1 are provided with an upper mold 5 and a lower mold 6 facing each other. Both molds 5 and 6 have a toggle mechanism T interposed between the movable plate 4 and the fixed plate 3.
The molds can be opened and closed vertically by the expansion cylinders 8, thereby allowing the mold to be clamped freely. The cylinder 8 is connected to the fixed plate 5
The toggle mechanism 7 cooperates with the piston rod 9 which is fixed to the toggle mechanism 3 and extends downward.
The cylinder 8 is of a hydraulically operated type,
That is, a hydraulic power source consisting of an oil pump 11 connected to an oil tank 10 is prepared, and this is supplied to the upper and lower accommodation chambers 8a. The cylinder 8 is connected to the cylinder 8a in a switchable manner so that the cylinder 8 can be operated up and down. The above is not particularly different from the conventional one, but according to the present invention, the fixing plate 3 is provided with a mold clamping cylinder 13 that supports the fulcrum 7a at the end of the toggle mechanism 7, and this is connected via a check valve 14. A relief valve 16 that opens at a predetermined high pressure is intervened in the oil supply path 15 communicating with the above-mentioned hydraulic power source 11, so that the inside of the cylinder 13 is maintained at the predetermined mold clamping pressure during the mold clamping operation.

That is, the toggle machine M7 is operated to separate the upper mold 5 and the lower mold 6.
Considering the case where the molds are clamped together, the fulcrum 7a at the end
The hydraulic pressure in the cylinder 13 supporting the molds is always maintained at a predetermined high pressure by the relief valve 16, and thus both types 5 and 6
(This is automatically obtained when a predetermined mold clamping pressure is applied.Next, when both molds 5 and 6 are opened, the shilling 1
3 (1. Pressure oil is supplied through the oil passage 15.
In this case, the pressure oil is maintained at a predetermined pressure by a relief valve 17 located upstream of the oil pickup path 15. The mold clamping cylinders 13 are arranged side by side on the fixed plate 3 in pairs at the front and rear, resulting in a total of four cylinders, as shown in the figure. According to the present invention, a clamping cylinder supporting the fulcrum at the end of the toggle mechanism is prepared, and the pressure inside the cylinder can be set to a predetermined pressure using a relief valve. It is possible to follow changes in mold thickness due to temperature changes, that is, changes in tie height, and has the advantage of not having the above-mentioned disadvantages of the conventional tie-end type that adjusts the nut at the end. have

[Brief explanation of the drawing]

FIG. 1 (top view of an example of a molding machine equipped with the device of the present invention,
Figure 2 shows the oil field circuit diagram.1... Board,
2, 2...Tailot, 3...Fixed slope, 4...Town moving board, 5, 6...Go to"!
7...7 Glue mechanism, 8...Mold opening/closing sill, 11...Hydraulic power source, 7a...Fully point, 13...Mold Tightening cylinder, 14... Chain valve, 15... Oil supply path, 16...
・Relief valve.

Claims (1)

[Claims] 1. A movable plate that is slidable along the rod is provided between the lower base plate and the fixed plate above it connected via a tie rod, and the movable plate and the base plate are opposed to each other. A type comprising 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 toggle mechanism interposed between the movable plate and the fixed plate to freely clamp the mold, The fixed plate is provided with a mold clamping cylinder that supports the fulcrum of the end of the toggle mechanism, and the oil supply path that communicates this with a hydraulic pump or other hydraulic power source via a check valve is provided with a relief valve that opens at a predetermined high pressure. A mold clamping device for a molding machine configured to maintain a predetermined mold clamping pressure inside the cylinder.