JPH0329001Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is used to extrude the product from the mold and demold it by operating it during the product extrusion and take-out process in the casting cycle (each cycle operation) of the die casting machine. This invention relates to a two-stage extrusion device.

<Prior art and its problems> Conventionally, the two-stage extrusion device used in this type of die-casting machine is an extrusion device in which the rear end of a main extrusion pin, which moves forward by the operation of a main extrusion cylinder, is clamped and supported. The plate moves to the set movement position and further moves to the forward movement limit. In that movement range, the two-stage ejector cam is operated to move the auxiliary ejector pin, the so-called two-stage ejector pin, in forward sliding contact, and from the tip of the main ejector pin. The structure uses a cam mechanism that separates the products.

However, this conventional device not only has a complicated structure, but also has the disadvantage that it is very difficult to set the timing for starting the operation of the auxiliary ejector pin.

<Problem to be solved by the invention> The technical problem to be solved by the invention is to easily set the operation start timing of the auxiliary ejector pin, and to make the setting easily and arbitrarily changeable. An object of the present invention is to provide a two-stage extrusion device that enables a significant reduction in extrusion time.

<Means for Solving the Problem> The technical means taken by the present invention to solve the above problem is that the auxiliary ejector pin drilled in the mold is coaxial with the pin mounting hole through which the auxiliary ejector pin is inserted so as to be slidable in and out. An extrusion plate is arranged in a gap between the back surface of the mold and the movable platen, and a through-hole is formed in each of the movable platen, and a main extrusion plate is arranged coaxially with the through-hole. It is characterized in that an auxiliary extrusion cylinder is disposed on the extrusion bumper plate of the cylinder, and the rod tip of the auxiliary extrusion cylinder and the rear end of the auxiliary extrusion pin are linked.

<Example> An example of the present invention will be described based on the drawings.
1 to 3 show the first embodiment, in which A is a well-known nesting mold consisting of a pair of movable molds _a1 and fixed molds _a2 , B is mold A, the main mold is movable mold a ₁
C is an extrusion rod 11 which is fixedly connected at one end to the extrusion bumper plate D of the main extrusion cylinder 2 attached to the movable platen B and passes through the movable platen B.
The movable platen B and the movable mold _a1 are fixedly supported at the other end.
an extrusion plate disposed in the gap with the back side of the mold;
A main ejector pin 1 and an auxiliary ejector pin 3 are respectively inserted into predetermined positions of the movable mold a ₁ so as to be slidable in and out from the back side of the mold toward the cavity surface 5.
The rear end is clamped and supported by the extrusion plate C, and the rear end of the auxiliary extrusion pin 3 is brought into contact with the tip of the rod 4a of the auxiliary extrusion cylinder 4 disposed on the extrusion bumper plate D.

Auxiliary ejector pin 3 The so-called two-stage ejector pin, like the main ejector pin 1, is attached to the pin mounting hole 6 drilled from a predetermined location on the cavity surface 5 of the movable mold a ₁ to the back surface of the mold, and then attached to the main extruder cylinder 2. The operation of the main extrusion pin 1 causes the product a to be extruded out of the movable mold a 1 and removed from the movable mold a ₁ , and the auxiliary extrusion cylinder 4 is operated to move the product a forward independently and release the product a from the tip of the main extrusion pin 1 .
Through holes 7 and 8 are provided on the extension line of the axis, more specifically, coaxially facing the pin mounting hole 6, and extending through the extrusion plate C and the movable platen B to the extrusion bumper plate D side. are drilled respectively.

The through holes 7 and 8 are for communication to coaxially connect the auxiliary extrusion pin 3 attached to the movable mold a ₁ and the rod 4a of the auxiliary extrusion cylinder 4 fixedly disposed on the extrusion bumper plate D. In the illustrated example, a hole is drilled in the push-out plate C to be slightly larger than the shaft diameter of the auxiliary push-out pin 3, and a hole is drilled in the movable plate B to be slightly larger than the outer diameter of the casing of the auxiliary push-out cylinder 4. Insert both loosely.

The auxiliary extrusion cylinder 4 advances the auxiliary extrusion pin 3 at a predetermined timing, such as during the extrusion operation by the main extrusion cylinder 2 in the extrusion process of the product a in the casting cycle of the die casting machine, or after the extrusion operation is finished, and It functions to separate the product a from the tip of the main extrusion pin 1 by moving it independently in the extrusion direction, and it is located on the extension line of the hole core of the through holes 7 and 8, more specifically, coaxially with the through holes 7 and 8. The tip of the rod 4a is coaxially connected to the rear end of the auxiliary push-out pin 3 by a coupling 9.

Incidentally, like the main extrusion cylinder 2, this auxiliary extrusion cylinder 4 is electrically connected to the electric control section of the die-casting machine and is operated in response to instructions from the control section.

Thus, in this embodiment, during the molten metal injection process in the casting cycle of a die-casting machine, the auxiliary extrusion pin 3 is placed on standby with its tip surface flush with the cavity surface 5, similar to the main extrusion pin 1. Then, the auxiliary ejector pin 3 is advanced together with the main ejector pin 1 by the main ejector cylinder 2, which operates at approximately the same time as the start of the mold opening operation of the mold A or at a predetermined timing after the start of the mold opening operation. The product a is once extruded from the movable mold a ₁ within the extrusion stroke range of the extrusion cylinder 2 (Fig. 2), and at the same time as the extrusion process by the main extrusion cylinder 2 is completed, the auxiliary extrusion cylinder 4 is operated and the auxiliary extrusion pin 3 is The main ejector pin 1 is made to move forward independently, separate the product a from the tip surface of the main extrusion pin 1, and extrude the product a.
figure).

Note that the timing at which the auxiliary ejector pin 3 starts moving forward independently is not limited to the above-mentioned timing, and may be started during the extrusion operation by the main ejector cylinder 2, for example, and the timing at which the operation starts depends on the electrical setting. Therefore, it can be done at any timing.

FIGS. 4 and 5 show other embodiments in which the operation mode of the auxiliary ejector pin 3 by the auxiliary ejector cylinder 4 is changed, and such an embodiment is performed at the same time as the mold opening operation of the mold A starts, or at the same time as the opening operation of the mold A starts. Auxiliary extrusion cylinder 4 in front
to move the auxiliary ejector pin 3 backward (fourth
), the tip end surface of the extrusion pin 3 is once separated from the product a, and the main extrusion cylinder 2 is operated to produce the product a.
Perform initial extrusion using only main extrusion pin 1 (5th
figure). After the extrusion process by the main extrusion cylinder 2 is completed, the auxiliary extrusion cylinder 4 is operated to move the auxiliary extrusion pin 3 to its forward limit in the same way as in the first embodiment described above, and the product a is removed from the main extrusion pin 1. Separate (Figure 3).

By operating the auxiliary ejector pin 3 in such a mode of operation, for example, when the extruded product a is grabbed and taken out by the product take-out device, it is possible to hand the product a to the take-out device in an unloaded state. , it is possible to reliably prevent accidents such as dropping of product a. However,
The auxiliary extrusion pin 3 is separated from the product a in advance, and the auxiliary extrusion pin 3 is placed again after the product a is completely solidified after extrusion by the main extrusion pin 1.
Since this is an extrusion method in which the product a is brought into contact with the product a and the product a is separated from the main ejector pin 1, the product a can be delivered to the product ejecting device without the biting force of the auxiliary ejector pin 3 on the product a. It is something.

<Effects of the Invention> Since the two-stage extrusion device of the present invention is constructed as described above, it exhibits the following effects.

An auxiliary extrusion pin, which is inserted into and retracted from the mold in the same manner as the main extrusion pin, is brought into contact with the rod end of the auxiliary extrusion cylinder, which is disposed on the extrusion bumper plate of the main extrusion cylinder. Since the auxiliary extrusion cylinder is actuated and the auxiliary extrusion pin is activated by the operation command from the electric control unit of the die-casting machine, the operation start timing of the auxiliary extrusion pin,
For example, after the product is extruded from the mold together with the main ejector pin and removed from the mold, the timing at which the auxiliary ejector pin starts its independent operation can be made to easily follow the extrusion operation of the main ejector pin.

Since the operation of the auxiliary ejector pin can be electrically controlled, the setting of the operation start timing of the auxiliary ejector pin can be easily and arbitrarily changed. Therefore, the extrusion time can be significantly shortened compared to the extrusion time associated with the extrusion operation of a conventional two-stage extrusion device, and productivity can be improved.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

Figures 1 to 3 show the first stage of the two-stage extrusion device of the present invention.
An example is shown, and Fig. 1 is a longitudinal sectional front view of the main part, and Fig.
The figure is a longitudinal sectional front view of the auxiliary extrusion pin extruding the product together with the main extrusion pin due to the operation of the main extrusion cylinder, and Figure 3 is the main extrusion with the auxiliary extrusion pin further sliding forward due to the operation of the auxiliary extrusion cylinder. 4 and 5 show the second embodiment, and FIG. 4 shows the product by sliding the auxiliary ejector pin backward by the operation of the auxiliary ejector cylinder. FIG. 5 is a longitudinal sectional front view of the main extrusion cylinder in a state in which the product is extruded only by the main extrusion pin by the operation of the main extrusion cylinder. In the figure, A: mold, B: movable plate, C: extrusion plate,
D: Extruded bumper plate, 1: Main extruded pin, 2:
Main extrusion cylinder, 3: Auxiliary extrusion pin, 4: Auxiliary extrusion cylinder, 5: Cavity surface, 6: Pin mounting hole, 7, 8: Through hole, 10: Bracket, 1
1: Extrusion rod.

Claims (1)

[Scope of utility model registration request] An extrusion rod is installed in the gap between the back surface of the die and the movable plate, which is attached to the stationary platen of the die-casting machine via a bracket with a desired gap, and passes through the movable platen of the main extrusion cylinder attached to the movable platen. In a two-stage extrusion device for a die-casting machine, an extrusion plate is fixedly supported by a die casting machine, and a main extrusion pin and an auxiliary extrusion pin are respectively inserted into and retracted from the back side of the die into the cavity surface of the die. A through hole was formed in each of the extrusion plate and the movable plate so as to coaxially oppose the pin mounting hole of the auxiliary extrusion pin bored in the mold, and the through hole was positioned coaxially opposite to the through hole. A two-stage extrusion device for a die-casting machine, characterized in that an auxiliary extrusion cylinder is disposed on the extrusion bumper plate of the main extrusion cylinder, and the rod tip of the auxiliary extrusion cylinder and the rear end of the auxiliary extrusion pin are linked. .