JP2750928B2 - Insert positioning method in die casting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for positioning an insert in a die casting machine for performing rotor die casting with an aluminum alloy.

[Conventional technology]

As shown in FIG. 7, one machine for this type of rotor die casting usually includes a fixed mold 2 ', a movable mold 3' and an intermediate mold 4 ', and the intermediate mold 4' and the movable mold 3 '. Workpiece 7 'having a dummy shaft 7A fitted and held with
And one end of the dummy shaft 7A to the intermediate mold 4 '
The movable mold 3 'is moved and closed, and the mold is closed. After die casting, the workpiece 7' is released from the movable mold 3 'by the pushing rod 6' and removed. I am taking it.

The intermediate mold 4 'of the die casting machine is slidably fitted to a plurality of guide pins 8' projecting from the fixed mold 2 '.

[Problems to be solved by the invention]

When the above-described conventional die casting machine is used to die-cast the workpiece 7 'mounted on the dummy shaft 7A, one end of the dummy shaft 7A of the unprocessed workpiece 7' is first inserted into the intermediate mold 4 '. It is held in the hole 4A.

However, this insertion hole 4A is easy to fit,
The clearance between the inner diameter of the insertion hole 4A and the outer diameter of the dummy shaft 7A is relatively large, and therefore, as shown in FIG. 6, the dummy shaft 7A fitted into the insertion hole 4A Has a tendency to incline downward due to the weight of the unprocessed object 7A integrated therewith.

As a result, the position of the unprocessed object 7A with respect to the movable mold 3 'is not always in a normal correspondence relationship (the centering is not perfect). Unworkable 7A, which cannot fit into the fitting recess
Was hit against the movable mold 3 ', so that it could not be seen as the unprocessed object 7A, and sometimes the mold was damaged.

Further, such a poor fitting of the unprocessed material 7A to the movable mold 3 'has been caused even if the following structure is the cause.

That is, the intermediate mold 4 'holding the unprocessed work 7A is slidably fitted to a plurality of guide pins 8' projecting from the fixed mold 2 '. For the sake of simplicity, the clearance between the inner diameter of the guide bush 14 'and the outer diameter of the guide pin 8' of the fitting hole of the intermediate mold is relatively large. The position with respect to the movable mold 3 'is not always in a regular correspondence relationship. As a result, as shown in FIG. 6, the unprocessed work 7' held by the intermediate mold 4 'is inclined when the mold is closed. The workpiece 7 'could not be fitted into the recess of the movable mold 3' conveniently, and the unprocessed product 7 'could be damaged.

[Means for solving the problem]

In order to solve the above-mentioned problems, a method for positioning an insert in a die casting machine according to the present invention comprises a fixed mold, a movable mold and an intermediate mold, and the intermediate mold and the movable mold. An unprocessed object having a dummy shaft fitted and held in the mold, the one end of the dummy shaft is first fitted and locked in the intermediate mold, then the movable mold is moved to close the mold, and after die casting, the mold is closed. In a workpiece positioning method of a die casting machine, which removes and removes a workpiece by an extruding rod on a movable mold side, after first fitting and locking one end of the dummy shaft into the insertion hole of the intermediate mold, By protruding substantially concentrically with respect to the dummy shaft, abutting against the other end of the dummy shaft and pressing the unprocessed object against the intermediate mold, and pressing the intermediate mold against the fixed mold The dummy shaft is centered, the movable die is moved to close the die while the extruded rod is in contact with the dummy shaft, and then the extruded rod is retired, followed by die casting. That's how it was done.

In addition, as described in claim (2), insertion of the second and subsequent unprocessed materials (insert materials) at the time of opening the mold so that the method of positioning the insert in the die casting machine is continuously and smoothly performed. In the state where the workpiece in the previous process remains in the movable mold, the unprocessed workpiece is inserted between the movable mold and the intermediate mold, and thereafter, the extrusion rod is protruded to remove the workpiece. At the same time as extruding from the movable mold, one end of the dummy shaft of the unprocessed object is fitted and locked to the intermediate mold via the processed object, and then, the extruded rod is retracted to free the processed object. We took the measure of taking it out.

In the present invention, the unprocessed object is, for example, an insert for a die-casting rotor, but any object that requires a dummy shaft in die-casting can be used.

[Action]

When inserting the unprocessed material between the intermediate mold and the movable mold at the time of opening the mold, first, one end of the dummy shaft of the unprocessed material is fitted and locked to the intermediate mold, and at this time, the dummy shaft and the intermediate mold are The other end of the dummy shaft slightly descends due to the clearance of the insertion hole to incline the unprocessed object, but by extending the pushing rod concentrically with the original axis of the dummy shaft, The dummy shaft is brought into contact with the dummy shaft, and is returned to its original axis for centering.

Then, the pushing rod is further pushed out to push the intermediate mold toward the fixed plate along the guide pin,
By bringing the intermediate guide bush into close contact with the fixed plate, the run-out of the center due to the allowance for play between the intermediate guide bush and the guide pin is corrected, whereby the centering of the unprocessed material can be completely performed.

As described above, since the movable die is moved in a state where the axis of the push rod and the axis of the dummy shaft are aligned, the movable die is moved in a state where the unprocessed object provided on the dummy shaft is held at a regular position. Is smoothly fitted into the recess.

Also, when gaicast casting is performed continuously,
When the mold is opened after the casting of the first workpiece is completed, the first workpiece is moved to the mold opening position while remaining in the movable mold, and the second unprocessed workpiece is removed from the movable mold. It is inserted between the first workpiece and the intermediate mold by a holding means (chuck), and then the first workpiece is pushed out by the pushing rod, and the second pushing is performed by the pushing. Is pressed against the intermediate mold, and the dummy shaft is inserted into the insertion hole of the intermediate mold. Then, the first workpiece is in a free state and is pushed out to the position of the holding means (chuck) holding the previous second unprocessed workpiece, and is taken out.

Thereafter, each step is repeatedly performed following the retraction of the push rod, the closing of the movable mold, the closing of the movable mold, and the die casting.

〔Example〕

Hereinafter, an embodiment of the method for positioning the insert in the rotor casting die casting machine according to the present invention,
This will be described in detail together with the structure of the die casting machine used in this method.

As shown in FIGS. 1 to 5, the die casting machine 1
Is basically equipped with a mold composed of a fixed mold 2, a movable mold 3, and an intermediate mold 4. The movable mold 3 can reciprocate toward the fixed mold 2 by a hydraulic cylinder 5 via a toggle mechanism. The hydraulic cylinder 5 is driven by receiving pressure oil from a pressure oil supply means PS composed of an electric motor 5 and a hydraulic pump by operating an electromagnetic valve.

Here, as can be seen from the plan view of FIG. 2, the fixed die 2, the movable die 3, and the intermediate die 4 are two workpieces 7 at a time.
(Here, the rotor core) is configured so as to be die-castable, but for the sake of convenience, a description will be given in which one workpiece 7 is handled.

Reference numeral 6 denotes an extruding rod, the tip of which is formed in a conical shape as shown in FIG. 5, and penetrates a concave portion of the movable mold 3 into which the workpiece 7 is fitted so as to push the workpiece 7 from the movable mold 3. The hydraulic cylinder 13 is provided so as to be able to move back and forth in the direction of its axis, and the axis is concentric with the axis of the dummy shaft 7a of the workpiece 7 held by the intermediate mold 4. It is arranged to be located.

The dummy shaft 7a is provided with a perforation in the axial center direction at the tip thereof, so that the tip of the push rod 6 can be fitted into the dummy shaft 7a so that more accurate centering can be performed.

The intermediate mold 4 is slidably and loosely fitted on a guide pin 8 protruding from the fixed mold 2 via a guide bush 14, and is separated from the closed mold close to the fixed mold 2 by a predetermined distance. The intermediate mold 4 is configured to be movable to a stroke end position of a working cylinder 15 described later.

The intermediate mold 4 includes a dummy shaft 7a of the workpiece 7.
Is provided with an insertion hole 4a for inserting one end thereof, and a gate and a runner for die casting are formed. The insertion hole 4a
Is coaxial with the axis of the push rod 6.

The fixed mold 2 is fixed to the main body of the machine 1 via a fixed die plate 9, and has a hot water supply passage communicating with the runner of the intermediate mold 4.

The fixed die plate 9 is provided with a plunger mechanism 10 for press-fitting molten metal, 10a is a plunger rod, 10b is a hydraulic cylinder, and 10c is an accumulator.

11 is a hot water supply port which leads to the runner of the fixed type 2,
The plunger mechanism 10 has an opening in a plunger sleeve 10d.

Reference numeral 12 denotes an insert robot, which has a configuration of a magic hand which is substantially known per se.
Is held and inserted between the movable mold 3 and the intermediate mold 4 in the opened state, and the work 7 after the processing is completed is taken out, but the detailed description thereof is omitted here.

Reference numerals 15 and 15 denote working cylinders, which are provided as a pair on both sides of the fixed mold 2, and their cylinder portions 15 a are respectively fixed to the fixed mold 2 side, and their rods 15 b are respectively attached to the intermediate mold 4. The intermediate mold 4 is forcibly slid and can be held at the position while being connected and fixed.

FIG. 6 shows a longitudinal section of each part of the intermediate mold 4, the fixed mold 2 and the workpiece 7 die-cast.

As shown in FIG. 6, the workpiece 7 is filled with a molten metal at a place where a number of silicon steel plates are piled up and penetrating a plurality of silicon steel plates obliquely in the circumferential direction. That is, the space 4b formed in the intermediate mold 4 becomes the blade of the casting rotor.

Reference numeral 4c denotes a gate pin gate, which connects the runner 2a of the fixed mold 2 to the space 4b.

Since it is configured as described above, the first workpiece 7
For die-casting, insert robot after opening mold
The workpiece 7 held by the workpiece 12 is inserted between the movable mold 3 and the intermediate mold 4, and one end of the dummy shaft 7 a on which the workpiece 7 is mounted is first inserted into the insertion hole 4 a of the intermediate mold 4.
After the engagement, the pushing rod 6 projects substantially concentrically with respect to the dummy shaft 7a, and is brought into contact with the other end of the dummy shaft 7a as shown in FIG. 7 is pressed against the intermediate die 4 and the intermediate die 4 is pressed against the fixed die 2 to center the dummy shaft 7a. The movable die 3 is held in a state where the pushing rod 6 is in contact with the dummy shaft 7a. The mold is closed by avoiding the movement, and thereafter, the pushing rod 6 is retracted, and thereafter, the die casting is performed via the plunger mechanism 10.

When the above steps are continuously repeated, when the second and subsequent unprocessed objects 7 are inserted when the mold is opened, the work 7 in the previous step remains in the movable mold 3. The unprocessed object 7 is inserted between the movable mold 3 and the intermediate mold 4, and thereafter, the pushing rod 6 is protruded to push out the workpiece 7 from the movable mold 3, and at the same time, through the workpiece 7. Then, the workpiece 7 is pressed against the intermediate mold 4, and then the workpiece 7 is taken out by the inserting robot 12, and the pushing rod 6 is again protruded, and its tip is attached to one end of the dummy shaft 7 a of the workpiece 7. The other end of the dummy shaft 7a is fitted and locked to the intermediate mold 4 to perform centering.

The subsequent casting step is the same as in the first case described above.

〔The invention's effect〕

According to the method for positioning a workpiece of a die casting machine according to claim (1) of the present invention, the conventional workpiece pushing rod is further extended so that the workpiece can be retracted so that the workpiece can be closed when the mold is closed. Since the centering is performed properly, the inclination due to the insertion play of the conventional workpiece with respect to the intermediate mold, or the inclination of the movable mold caused by the engagement play between the intermediate mold holding and holding the intermediate mold and the guide pin thereof is caused. This has the effect of preventing damage to the workpiece and the mold due to the collision, and also has the effect of reducing the incidence of defective products.

According to the method for positioning a workpiece of a die casting machine according to claim (1), the protection of the workpiece and the mold and a reduction in the defective product occurrence rate can be obtained even when the die casting is performed continuously. There is an effect that can be.

[Brief description of the drawings]

The drawings show a die casting machine used to carry out the method for positioning a workpiece of the die casting machine according to the present invention, FIG. 1 is an overall view thereof, FIG.
FIG. 3 is a side view of a main part showing a step in which the mold is opened and the extrusion rod starts to protrude a cast product, FIG. 4 is a side view of a main part showing a step in which the extrusion by the extrusion rod is completed, FIG. 5 is a side view of a main part showing a closed state, FIG. 6 is a longitudinal side view of a main part of an intermediate mold and a fixed mold part holding a workpiece, and FIG. It is a side view of the principal part shown.

Claims (2)

(57) [Claims] 1. An unprocessed object comprising a fixed mold, a movable mold and an intermediate mold, and having a dummy shaft fitted and held in the intermediate mold and the movable mold, the first end of the dummy shaft is first placed in the intermediate mold. The movable die is closed by moving the movable die after being fitted and locked to the die, and after the die casting, the insert is positioned in a die casting machine that releases and removes a workpiece by the extrusion rod on the movable die side. After first fitting and locking one end of the dummy shaft into the insertion hole of the intermediate mold, the pushing rod protrudes substantially concentrically with respect to the dummy shaft, and is brought into contact with the other end of the dummy shaft. Press the workpiece against the intermediate mold,
Further, the intermediate mold is pressed against a fixed mold to center the dummy shaft, and the movable mold is moved to close the mold while the pushing rod is kept in contact with the dummy shaft. A die casting method, and thereafter performing die casting. 2. The method according to claim 1, further comprising the step of: inserting the second and subsequent unprocessed workpieces at the time of opening the mold while removing the unprocessed workpiece from the movable mold and the intermediate mold in a state where the workpiece remains in the movable mold. After that, the pushing rod is pushed out to push out the workpiece from the movable mold, and at the same time, one end of the dummy shaft of the unprocessed workpiece is fitted and locked to the intermediate mold through the workpiece. 2. The method according to claim 1, wherein the extruding rod is retracted to remove the workpiece in a free state.