JPH0232063B2 - TATEGATADAIKASUTOKINOKANAGATAKOKANSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold changing device for injection molding machines such as die casting machines and plastic molding machines, and more particularly to a mold changing device for vertical die casting machines.

The diameter of the injection sleeve attached to the mold in a vertical die-casting machine is generally controlled according to the diameter of the plunger tip, regardless of the size of the mold.For example, if the weight of the cast product is the same, The diameter of the injection sleeve does not change even when the mold is replaced due to a change in the shape or size of the molded product, or when the weight of the cast molded product (amount of molten metal filled into the injection sleeve) changes. This can be done by simply changing the length of the injection sleeve.

Therefore, when the mold is replaced, the difference in diameter between the injection sleeve and the plunger tip mounted on the mold remains unchanged, and the fitting dimension is controlled to a predetermined value.

Conventionally, when changing the mold in such a vertical die-casting machine, in order to disengage the plunger tip from the injection sleeve while the mold is open, the upper and lower parts are moved by a crane or a cylinder mechanism attached to the lower fixed stand. The mold section consisting of both molds is lifted upwards and carried out of the machine, or the two-split joint that connects the piston rod and plunger rod of the injection cylinder is removed from the piston rod and plunger rod, and then installed between the ends of the piston rod and plunger rod. After the spacer was removed and the plunger tip fitted into the injection sleeve was removed from the injection sleeve, the mold section was taken out of the machine and the mold was replaced.

However, in this conventional mold change, when unfitting the plunger tip and injection sleeve, the operator must pry open the two halves of the joint and remove the piston rod and plunger rod ends while holding the heavy plunger rod. Since the plunger tip and the injection sleeve must be disengaged after the spacer attached to the spacer is removed, it takes time to replace the plunger tip and the injection sleeve, and the replacement work is also dangerous.

The present invention was conceived in view of these points,
The present invention provides a mold changing device for a vertical die casting machine that allows mold changing in a short time.

Another object of the present invention is to provide a mold changing device for a vertical die casting machine, which allows the mold to be replaced without touching the mold clamping part.

FIG. 1 is a schematic configuration diagram of a mold changing device showing an embodiment of the present invention. Reference numeral 10 denotes a lower fixing base fixed to a floor 11, and the fixing base 10 has one end connected to an upper fixing base 12 with a nut 13. Tie bar 14 fixed through
The other end is attached via a nut 15. 1
Reference numeral 6 denotes a movable die plate that is slidably fitted to the tie bar 14, and a block 17 is attached to the plate 16.
An upper mold 18 is fixed thereto. Reference numeral 19 denotes an extrusion plate attached to the block 17, which is configured to move up and down as shown in the figure by a cylinder mechanism (not shown).
0 is attached. A guide pin 21 guides the extrusion plate 19 and is fixed to the upper mold 18. A lower mold 22 is located opposite the upper mold 18, and is configured to form a cavity 23 when both the molds 18 and 22 are closed. 24 is a mold mounting base to which the lower mold 22 is attached;
is slidably placed on a mold carrier 25 fixed to the floor 11, and includes a cylinder mechanism (not shown) or a rack (not shown) fixed to the mold carrier 25;
The lower mold 22 is easily engaged with the lower mold 22 and is moved by a conveying means 9 such as a pinion (not shown) and an electric motor (not shown) over a mold conveying table 25 for a predetermined stroke. 26 is an injection sleeve attached to the lower mold 22 and the mold mount 24. 27 is an injection cylinder attached to the lower fixed base 10, and a piston rod 29 of an injection piston 28 is slidably fitted into the cylinder 27.
The rear end of a plunger rod, which has a plunger tip 30 attached to the tip that is slidably fitted into the injection sleeve 26, is fixed to the tip of the plunger rod via a split joint 31. 32 is a piston for raising and lowering the plunger located on the axis of the injection piston 28 and below, and the piston 32 is connected to both the upper and lower molds 18,
22 is in the mold open state, by pushing the injection piston 28 downward in the figure, the plunger tip 30 is pushed out from the injection sleeve 26, and the plunger tip 3 is removed.
0 and the injection sleeve 26 are disengaged. Reference numeral 33 indicates the mold to be replaced next, and the mold mounting base 3 is slidably placed on the mold carrier 25.
The mold mount 34 is connected to the mold mount 24 via a connecting rod 35.
The mold mount 34 may be integrated with the mold mount 24 without using the connecting rod 35.

Next, the operation of mold exchange according to the present invention will be explained with reference to FIGS. 2 to 4. When changing molds depending on the product, move die plate 16 and block 1.
7 is released, the movable die plate 16 is moved in the mold opening direction by the operation of the mold clamping cylinder 36, and the block 17, both upper and lower molds 18, 22, and the mold are moved to the state shown in FIG. The mold mounting base 24 is kept in a state where it can move integrally on the mold carrier 25.

Next, as shown in FIG. 3, by lowering the plunger lifting piston 32, the injection piston 28 also lowers and the plunger tip 30 is disengaged from the injection sleeve 26.

In this state, when the mold mount 24 is moved to the left as shown in FIG. 4 by operating the conveyor 9, the block 17 and both upper and lower molds 18, 22 are removed from the machine together with the mold mount 24. It begins to be carried out, and at the same time, the mold mounting base 34 begins to move. When the mold mount 24 is carried out of the machine and comes to the predetermined position, the mold mount 3
4 comes to a predetermined position inside the machine as shown in FIG.
In this state, the movable die plate 16 is lowered by the operation of the mold clamping cylinder 36, and the proc 17a is fixed to the movable die plate 16, thereby completing the mold exchange. Then, in the state shown in FIG. 4, both used molds 18 and 22 are taken down from the mold mount 24, and the mold to be used next is attached to the mold mount 24.

As explained above, according to the present invention, molds can be replaced safely and in a short time without requiring any human power.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram showing an embodiment of the present invention, and FIGS. 2 to 4 are explanatory diagrams of the operation of the present invention. 9...Transportation means, 10...Lower fixing stand, 11...
...Floor surface, 12...Upper fixing base, 13...Nuts,
14... Tie bar, 15... Nut, 16... Moving die plate, 17... Block, 18... Upper mold, 19... Extrusion plate, 20... Extrusion pin, 21
... Guide pin, 22 ... Lower mold, 23 ... Cavity, 24, 34 ... Mold mounting stand, 25 ... Mold conveyor, 26 ... Injection sleeve, 27 ... Injection cylinder, 28 ... Injection piston, 29... Injection piston rod, 30... Plunger tip, 3
DESCRIPTION OF SYMBOLS 1... Coupling, 32... Piston for raising and lowering plunger, 33... Mold, 35... Connecting rod, 36... Mold clamping cylinder.

Claims (1)

[Claims] 1. A mold carrier installed between the lower fixed base and the movable die plate on the same plane as the lower fixed base, and the upper and lower molds that are movably mounted on the same carrier and used and will be used next, respectively. A mold mount is placed and moved on the mold conveyor table by a conveying means, and the initial position of the injection piston of the injection cylinder installed on the lower fixed base is moved, and the plunger tip is fitted into the injection sleeve. A vertical die-casting device comprising a plunger and a piston for lifting and lowering, which are attached and detached from each other, and is characterized in that the upper and lower molds to be used for the next production are alternately moved on the mold conveying platform to exchange the molds. Machine mold changing device.