JPH0324280Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a die-casting mold.

(Conventional technology and its problems) When a die-casting mold is used repeatedly,
A slight gap is created between the engagement surface of the stopper insertion part of the movable core and the stopper.

This is due to wear due to the friction between the stopper insertion part and the stopper during mold clamping and mold opening between the fixed mold and the movable mold, and due to wear remaining on the mold dividing surface and the sliding surface of the movable core. This is due to deformation of the stopper fitting and the stopper due to mold clamping in a state where the fitting positions of the stopper fitting and the stopper are shifted due to biting of the casting flash.

As mentioned above, if a gap is created between the engagement surface of the stopper insertion part and the stopper, the movable core will slide due to the pressure of filling the cavity with molten metal when filling with molten metal, resulting in dimensional accuracy of the product. There are problems that make it worse.

(Technical problem to be solved by the invention) The technical problem to be solved by the invention to solve the above problem is that a slight gap is created between the stopper insertion part and the engagement surface of the stopper in the movable core. Even in this case, the purpose is to prevent the movable core from sliding due to the pressure of filling the cavity with the molten metal and other forces during filling with the molten metal.

(Technical means for achieving the technical problem) The technical means of the present invention for achieving the above-mentioned technical problem is that the back side of the stopper insertion part of the movable core is directed toward the center of the stopper insertion part of the movable core. A stopper that is removably inserted into the insertion portion is provided with an engagement slope that matches the slope, and a spring means is provided to spring the stopper toward the distal end side. The stopper is provided so as to be slidable, and a gap is provided between the tip of the stopper and the inner surface of the stopper insertion part when the stopper is fitted into the stopper insertion part.

(Function) According to the above configuration, when the die-casting mold is repeatedly used, the stopper insertion portion of the movable core and the stopper will rub against each other due to the mold clamping and mold opening actions of the fixed mold and the movable mold. When brought together, a gap is created between these engaging surfaces, particularly between the engaging surfaces located in the direction in which the movable core slides.

Then, the spring means provided in the stopper moves the stopper toward the distal end by the amount of the gap, that is, toward the back of the stopper insertion part, filling the gap;
Fix the movable core in its normal position.

(Effects of the invention) The present invention has the following effects by having the above configuration.

Even if a gap is created due to friction between the engagement surface of the stopper insertion part of the movable core and the stopper, the stopper moves forward by the amount of the gap to fill the gap, so that the movable core can be moved to a predetermined position. It can be fixed in position at all times and prevented from sliding.

When the stopper wears out due to friction, it can be easily replaced.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

A in the figure is a die-casting mold, which is a conventional die-casting mold which is composed of a movable mold 1, a fixed mold 2, a movable plate 3, a fixed plate 4, various mechanical members, electrical equipment, etc.

Reference numeral 5 denotes a movable core, which is slidably arranged on the mold matching surface of the movable mold 1 via a cylinder S, and when the movable mold 1 and the fixed mold 2 are clamped together, A cavity portion C is formed.

Reference numeral 6 denotes a stopper insertion portion, into which a stopper 7 attached to the fixed mold 2 is inserted and inserted in a freely removable manner when the movable mold 1 and the fixed mold 2 are clamped.

The stopper 7 in the stopper insertion part 6
The engagement surface with the inserting portion 6 is formed into an inclined surface m whose inner surface direction is inclined toward the center of the insertion portion 6.

The stopper insertion part 6 is formed in a step shape in this drawing, but in the case of a recessed groove shape, the back side of one or both of the opposing engagement surfaces is the center side of the insertion part 6. It is formed by a sloped surface.

The stopper 7 is for preventing the movable core 5 from sliding due to the filling pressure during filling with molten metal and fixing it in a predetermined position, and the stopper 7 is fitted into the stopper insertion part 6. and an adjusting screw 8 that holds and fixes the stopper 7.

The stopper 7 has the stopper fitting part 6.
An engaging inclined surface 7a is formed, the tip of which coincides with the inclined surface m of the adjusting screw 8, and which is inclined toward the center. It has been inserted.

The guide groove 9 is made of a metal different from that of the fixed mold 1 and is formed into a box shape with a bottom surface shorter than the top surface.

Further, a spring means such as a spring 10 is loaded between the rear end of the stopper 7 and the inner surface of the guide groove 9.
The protrusion and retraction of the stopper 7 is adjusted by constantly springing the stopper 7 toward the tip and rotating the adjusting screw 8.

Therefore, when the fixed mold 1 and the movable mold 2 are clamped, the stopper 7 is attached to the stopper insertion part 6 so that there is a gap P between its tip and the inner surface of the insertion part. It is inserted in the state where it is formed.

The gap P is for allowing the stopper 7 fitted into the stopper insertion part 6 to slide forward, and the slope m of the stopper insertion part 6 and the engagement slope of the stopper 7 If a gap is created due to wear between the movable core 5 and the stopper 7a due to friction, rotating the adjustment screw 8 moves the stopper 7 forward by the amount of wear and fills the gap.
to fix it in place.

In addition, when the stopper insertion part 6 is formed in the shape of a concave groove with the back surface inclined toward the center of the insertion part 6 as described above, the stopper 7 also has a shape that matches this. That is, one or both of the surfaces that engage with the inclined surface of the stopper insertion section are formed as inclined surfaces that are inclined toward the center of the insertion section 6 toward the tip.

[Brief explanation of the drawing]

1 to 3 are operational cross-sectional views of the die-casting mold of the present invention. In addition, in the figure, A...Mold for die casting, 5...Movable core, 6...Fitting part for stopper, 7...Stopper, 7a...Engagement slope, P...Gap, m...
...Indicates each inclined surface.

Claims (1)

[Scope of utility model registration request] The stopper insertion portion of the movable core is provided with an inclined surface whose rear side is inclined toward the center of the insertion portion, and the stopper that is removably inserted into the insertion portion is provided with an engagement surface that matches the inclined surface. The stopper is provided with an inclined surface and is slidably provided via a spring means that springs the stopper toward the tip side, and when the stopper is inserted into the stopper fitting part, the tip part of the stopper and the stopper fitting part are connected to each other. A die-casting mold that is formed with a space between it and the back surface.