JP3358794B2 - Insert pin mold structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion pin mold structure for inserting an insertion pin into a pin insertion hole.

[0002]

2. Description of the Related Art Conventionally, a movable nest 1 having a pin insertion hole 12 as shown in FIG.
And a slide core 22 having an insertion pin 23 having a shaft core PS, and a core holder 20 for holding the slide core 22
And the hydraulic cylinder 3 held by the movable nest 1, the cylinder rod 30 of the hydraulic cylinder 3 and the core holder 20.
And a connecting means 4 for connecting the two.

As shown in FIG. 3, the axis PR of the cylinder rod 30 of the fluid pressure cylinder 3 is the axis P of the insertion pin 23.
At a predetermined interval L in the direction perpendicular to the axis with respect to S, the axis is substantially parallel to the axis PS. Connecting means 4
A connecting plate 40, a fastening bolt 41 for fastening one end 40 a of the connecting plate 40 to the cylinder rod 30,
0 and the mounting flange 20 of the core holder 20
and a fastening bolt 44 for fastening t.

In this case, when the hydraulic cylinder 3 is driven, the cylinder rod 30 advances in the direction of arrow X1, and the core holder 20 advances along the slide key 22 along the slide key 13 in the direction of arrow X1 via the connecting plate 40. .
The end surface 20m of the core holder 20 that has moved forward contacts the contact surface 1f of the movable nest 1. At this time, the core holder 20 has advanced to its forward end (= the position of the contact surface 1f). Thus, the operation of inserting the insertion pin 23 into the pin insertion hole 12 is completed.

When the insertion operation of the insertion pin 23 is completed as described above, the tip 23k of the insertion pin 23 protrudes beyond the pin insertion hole 12. During molding,
Since the molding material surrounds the protruding tip portion 23k of the insertion pin 23, a molding hole that forms a mold with the protruding tip portion 23k is formed in the molded product. In the above-mentioned structure, improvement in durability is required, and various measures are taken.
However, in recent years, further improvement in durability has been demanded.

[0006]

In the above-described structure, the wall defining the pin insertion hole 12 may be damaged. The cause of the damage is presumed as follows. That is, as can be understood from the above description, the core holder 20 is executed by the expansion and contraction operation by the cylinder rod 30 of the hydraulic cylinder 3 until the insertion of the insertion pin 23 is completed.
If the stroke of the hydraulic cylinder 3 is still excessive despite the end surface 20m of the hydraulic cylinder 3 being stopped at its forward end (= abutment surface 1f), the cylinder rod 30 of the hydraulic cylinder 3 is moved to an arrow. It is assumed that the camera has not yet moved in the X1 direction. Therefore, a lifting force may be applied to lift the distal end 23k of the insertion pin 23 in a direction perpendicular to the axis thereof, that is, in the direction of arrow A1. This is because the axis PR of the cylinder rod 3 and the axis PS of the insertion pin 23 are separated from each other by a distance L, so that a moment in the direction of the arrow A1 easily acts on the tip 23k of the insertion pin 23.

[0007] Due to such a floating phenomenon, the distal end portion 2 of the insertion pin 23 inserted into the pin insertion hole 12.
The 3k axis tends to be displaced in the direction of the arrow A1 in the direction of θ °. As a result, when the number of times of molding increases over a long period of use, the wall portion 12e defining the pin insertion hole 12 is easily damaged due to fatigue or the like. In order to prevent breakage, a method of substituting the hydraulic cylinder 3 with another driving device is adopted, and in order to avoid a moment that causes a lift, the pressing operation is performed directly from an extension of the axis PS of the insertion pin 23. Although adoption of a system is conceivable, arranging the cylinder on an extension of the axis PS increases the size of the mold. Therefore, this system is not preferable in consideration of downsizing of the mold. The fluid pressure cylinder 3 is preferably employed because it has an advantage that the force when the insertion pin is removed from the product after casting can be increased, that is, a large driving force can be secured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and provides an insertion pin mold structure which is advantageous in suppressing damage to a wall surface forming a pin insertion hole while employing a fluid pressure cylinder. As an issue.

[0009]

SUMMARY OF THE INVENTION An insertion pin mold structure according to the present invention comprises: a mold having a pin insertion hole; a fixed mold combined with the mold having a pin insertion hole; A slide portion having an insertion pin that is provided and is inserted into the pin insertion hole as it advances, and is withdrawn from the pin insertion hole as it retreats, is separated from the axis of the insertion pin by a predetermined distance in a direction perpendicular to the axis. Together with a hydraulic cylinder having an actuator capable of moving forward and backward along a direction parallel to the axis, and connecting means for connecting the actuator of the hydraulic cylinder and the slide portion, and interlocking the actuator and the slide portion. In the insertion pin mold structure for performing the operation of inserting the insertion pin into the pin insertion hole by advancing the slide portion to the forward end thereof using a fluid pressure cylinder , provided in the mold, Connecting hand
A stop means for temporarily stopping the slide portion at a temporary stop position a predetermined section from the advance end before the advance end of the slide portion by the contact of the step, a pressing inclined surface formed on the fixed mold and a slide portion And an engagement inclined surface having a slope that can be engaged with and engaged with the holding inclined surface of the fixed mold, and the mold moves toward the fixed mold.
The hold down slope and the engagement slope meet, and the slide section is moved forward independently of the operation of the fluid pressure cylinder for a predetermined section from the stop position to the forward end of the slide section, and the pin insertion hole is moved with the advance. and comprises a slide portion independently advancing means for generating a driving force to promote the insertion of the insertion pin,
Drive the hydraulic cylinder until the ride section stops
To advance the slide part, and after the slide part stops
Now, the holding inclined surface formed on the fixed mold and the sliding part
The slide part is brought into contact with the engagement slope formed at
It is characterized by moving forward .

[0010]

According to the structure of the present invention, when the hydraulic cylinder is driven, the slide portion moves forward to its forward end. Thereby, the operation of inserting the insertion pin into the pin insertion hole is performed. Here, in the structure according to the present invention, the stopping means is provided. Accordingly, the slide portion moves forward together with the insertion pin by driving the fluid pressure cylinder. Then, the slide portion temporarily stops at a temporary stop position a predetermined section from the forward end before the forward end of the slide portion. At this time, even if the stroke still remains in the fluid pressure cylinder, the operation of the fluid pressure cylinder temporarily stops at that position by the operation of the stopping means.

In a predetermined section from the temporary stop position to the forward end, the slide portion moves forward independently of the operation of the hydraulic cylinder by the slide portion independent advance means. With the advance, insertion of the insertion pin into the pin insertion hole proceeds. The slide portion independent advancing means may be any as long as it can move the slide portion independently of the driving force of the hydraulic cylinder.
Ku, by inclined surfaces formed on the mold of the stationary mold and the insert mold such as in the embodiment section later adopt the method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a partial insert 10 is protruded from a movable insert 1 as a mold. Partial nesting 1
0, a pin insertion hole 12 is formed so as to penetrate in the directions of arrows X1 and X2. The slide portion 2 includes a core holder 20 and a slide core 22 held by the core holder 20.
It is composed of

The core holder 20 is movable along the slide key 13 formed on the movable insert 1, that is, along the directions of arrows X 1 and X 2. The slide core 22 extends along the slide surface 1r of the movable nest 1;
1, and can be moved along the X2 direction. An insertion pin 23 to be inserted into the pin insertion hole 12 is formed at the tip of the slide core 22. Therefore, the insertion pin 23
Along the axis PS, that is, along the directions of the arrows X1 and X2, it is possible to advance and retreat.

A fluid pressure cylinder 3 is attached to the mounting portion 15 of the movable nest 1. The fluid pressure cylinder 3 can be composed of an air cylinder and a hydraulic cylinder. Fluid pressure cylinder 3
Is provided with a cylinder rod 30 as an actuator. The axis PR of the cylinder rod 30 is spaced apart from the axis PS of the insertion pin 23 by a predetermined distance L, and is substantially parallel to the axis PS. As the fluid pressure cylinder 3 is driven, the cylinder rod 30 can be extended and contracted along the axis PR.

The connecting means 4 fastens a connecting plate 40 extending in the directions indicated by arrows Y1 and Y2, which is a direction intersecting the moving direction of the slide core 22, with one end 40a of the connecting plate 40 and the tip of the cylinder rod 30. It has a fastening bolt 41, and a holding bolt 42 for holding the other end 40 c of the connecting plate 40 and the core holder 20. The cylinder rod 30 of the fluid pressure cylinder 3 and the core holder 20 are connected by the connecting means 4. The holding bolt 42 is provided at a shaft portion 42a extending in the directions of the arrows X1 and X2, a first head 42c provided at one end of the shaft portion 42a in the axial length direction, and provided at the other end of the shaft portion 42a in the axial length direction. And a second head 42d. The shaft portion 42a is inserted into the insertion hole 20s of the mounting flange 20t of the core holder 20 and the insertion hole 40s of the connecting plate 40. A gap t _C is set between the end surface 42k of the second head 42d and the end surface 40k of the connecting plate 40.

A stop stopper 6 as a stop means is provided on the movable nest 1. Before the start of the movement, the connecting plate 40 at the position K1 moves in the direction of the arrow X1, and the stop stopper 6
When in contact with the end face 20m of the core holder 20 is temporarily stopped once at a stop position X _w. At this time, as can be understood from FIG. 1, the end face 20m of the core holder 20 and the movable nest 1
Between the abutment surface 1f of the clearance t _a (≒ 1mm) is formed as a predetermined interval. Relationship between the clearance t _a and the clearance t _C is the clearance t _C is larger set than the gap _{t a (t C> t a} ).

The temporary stop position _Xw is set in the direction of the arrow X1 which is the moving direction of the slide core 22,
2 is set to the front end side, that is, to the front side of the contact surface 1f by t _a . In the present embodiment, a fixed mold 7 combined with the movable nest 1 is provided. The stationary mold 7 has a holding inclined surface 70. The holding inclined surface 70 is inclined so as to approach the core holder 20 in the retreating direction (= arrow X2 direction) as it approaches the core holder 20 from the holding inclined surface 70, that is, in the direction of the arrow Y2. The slide core 22 is also formed with an engagement inclined surface 26 having an inclination capable of engaging with the holding inclined surface 70.

When the movable nest 1 moves toward the fixed mold 7 in the direction of the arrow Y1, the holding inclined surface 70 and the engaging inclined surface 26 are brought together, and the core holder 20 moves in the forward direction, that is, in the direction of the arrow X1. driving force F _x is generated in the core holder 20. The driving force F _x, core holder 20 and the slide core 22 may be advanced in the direction of arrow X1. Thus the pressing inclined surface 70 of the engagement inclined surface 26 and the stationary mold 7 of core holder 20 to exert a driving force F _x acts as a slide unit independent advancement means.

(Usage) When the insertion pin 23 is inserted, the fluid pressure cylinder 3 is driven. Then, the cylinder rod 30 expands and contracts in the arrow X1 direction. Therefore, the core holder 20, the slide core 22, and the insertion pin 23 move in the arrow X1 direction together with the connecting plate 40 that has returned to the position K1. As shown in FIG. 2, when the connecting plate 40 contacts the stopper surface 6f of the stop stopper 6, the cylinder rod 30 stops. At this time, even if the stroke still remains in the fluid pressure cylinder 3, the cylinder rod 30 of the fluid pressure cylinder 3 stops at that position.

When the cylinder rod 30 stops, the core holder 20, the slide core 22, the insertion pin 23
Stops in the direction of arrow X1. Therefore, as can be understood from FIG. 1, the forward end of the core holder 20 (= the contact surface 1)
In front of the f), the forward end (= contact surface 1f) temporarily stop positions Amashi gap t _a from X _w, end surfaces 20m of the core holder 20 is temporarily stopped.

Thereafter, the movable nest 1 is moved toward the fixed mold 7 in the direction of arrow Y1 by a mold driving means (not shown). Then, the engaging inclined surface 26 of the core holder 20 comes into contact with and engages with the pressing inclined surface 70 of the fixed mold 7. As a result, the driving force F _x acts on the core holder 20, the core holder 20 and the slide core 22 is advanced in the direction of arrow X1.

[0022] That is, in this embodiment, after the end surface 20m of the core holder 20 has once temporarily stopped at the stop position X _w is
The slide core 22 is independent of the operation of the fluid pressure cylinder 3.
Moves forward. In other words, the slide core 22 moves forward in the arrow X1 direction without receiving the driving force from the fluid pressure cylinder 3. Results slide core 22 is advanced by the driving force F _x, as shown in FIG. 2, the abutment surface 1f of the movable insert type 1
The operation of inserting the insertion pin 23 into the pin insertion hole 12 is completed while the end surface 20m of the core holder 20 abuts on the core holder 20.
When the insertion operation is completed, the distal end 2 of the insertion pin 23 is
3k protrudes from the pin insertion hole 12 in the arrow X1 direction.

[0023] In this embodiment Thus, the driving force core holder 20 by F _x, which mounting flanges 20t arrow X
Although the connecting plate 40 advances in one direction, the stop stopper 6
For being stopped by the stopper surface 6f contact, between the connecting plate 40 and mounting flange 20t of core holder 20 as shown in FIG. 2, the gap t _a is formed. Also between the end face 42k of the end face 40k and the 2 42d head of the connecting plate 40, the gap _{t P (t P <t a} ) it is formed. In other words, in front of the other end portion 40c of the connecting plate 40 is clearance t _a is formed, the gap t _P is the rear of the other end portion 40c of the connecting plate 40 is formed. Thus the amount corresponding to the gap t _a and the gap t _P, the displacement of the other end portion 40c of the connecting plate 40 is allowed absorption. In other words, it can be said that the other end 40c of the connecting plate 40 has the displacement absorbing means.

With the core holder 20 temporarily stopped as described above, the stroke of the fluid pressure cylinder 3 still remains, and the cylinder rod 30 attempts to further contract in the direction of arrow X1. As a result, the force for urging the one end portion 40a of the connecting plate 40 in the arrow WA direction acts, as connecting plate 40 is tentatively deflection displacement, deflection displacement forward (arrow X1 direction), the gap t _a Absorbed. Alternatively, the bending displacement backward (in the direction of the arrow X2) corresponds to the gap t _P.
Is absorbed by

[0025] In a state where the insertion of the insertion pin 23 into the pin insertion hole 12 as described above has been completed, the molding material (metal aluminum based such as resin, etc.) is loaded into the mold cavity C _P.
At this time, a molding hole is formed in the molded product by the distal end portion 23k where the insertion pin 23 projects from the pin insertion hole 12.
After molding, the fluid pressure cylinder 3 moves backward, the cylinder rod 30 extends in the direction of arrow X2, the core holder 20 retreats in the direction of arrow X2 by the connecting plate 40, and the slide core 22 and the insertion pin 23 move in the direction of arrow X2. The insertion pin 23 is separated from the pin insertion hole 12.

(Effects of Embodiment) As described above, according to the structure of the present invention, the driving force of the fluid pressure cylinder 3 is used until the core holder 20 is stopped immediately before the core holder 20 is advanced. After the suspension, the drive by the engagement between the engaging inclined surface 26 and the holding inclined surface 70 functioning as a drive source independent of the operation of the hydraulic cylinder 3 without using the driving force of the hydraulic cylinder 3. using the force F _X, the core holder 20, to advance the slide core 22 to complete the insertion of the insertion pin 23.

After the core holder 20 has once stopped, the insertion pin 23 is separated from the driving force of the hydraulic cylinder 3. Therefore, even if the stroke still remains in the fluid pressure cylinder 3, unlike the related art, the lift caused by the excess stroke hardly acts on the insertion pin 23. Therefore, it is advantageous to suppress the breakage of the pin insertion hole 12, and can contribute to prolonging the life and improving the durability of the pin insertion hole 12.

[0028]

As described above, according to the structure of the present invention, the driving force of the hydraulic cylinder is used until the slide portion is temporarily stopped, and after the slide portion is stopped, the driving force of the hydraulic cylinder is used. Instead, the slide portion is advanced by the slide portion independent advancing means, which is a drive source independent of the operation of the fluid pressure cylinder, and the insertion of the insertion pin into the pin insertion hole is completed. After the slide part has stopped temporarily,
The insertion pin is separated from the driving force of the hydraulic cylinder.

Therefore, unlike the prior art in which the insertion pin is executed only by the stroke of the hydraulic cylinder until the insertion is completed, even if the hydraulic cylinder still has an extra stroke, the lifting force caused by the extra stroke causes the insertion force to increase. Difficult to act on pins. Therefore, it is advantageous in suppressing breakage in the wall surface section defining the pin insertion hole, and can contribute to prolonging the life and improving the durability of the pin insertion hole.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a state in which a core holder is temporarily stopped at a temporary stop position a predetermined section from a forward end.

FIG. 2 is a configuration diagram showing a state where a core holder once stopped at a stop position is further advanced, and insertion of an insertion pin into a pin insertion hole is completed.

FIG. 3 is a configuration diagram showing a state in which a core holder is advanced and an insertion pin is inserted into a pin insertion hole according to a conventional technique.

[Explanation of symbols]

In the figure, 1 is a movable nest type (die), 12 is a pin insertion hole, 2
0 is a core holder, 22 is a slide core, 23 is an insertion pin, 26 engagement inclined surface (slide part independent advancing means), X _W
Is a stop position, 3 is a hydraulic cylinder, 30 is a cylinder rod (operator), 4 is a connecting means, 40 is a connecting plate, 6 is a stop stopper (stopping means), 7 is a fixed mold, and 70 holding inclined surface ( Slide section independent advancing means).

Claims (1)

(57) [Claims] 1. A mold having a pin insertion hole, a fixed mold combined with the mold having the pin insertion hole, provided so as to be able to advance and retreat, and being inserted into the pin insertion hole with advance, A slide portion having an insertion pin that is withdrawn from the pin insertion hole with retreat; an operation capable of moving forward and backward along a direction parallel to the axis and at a predetermined interval in a direction orthogonal to the axis of the insertion pin; A hydraulic cylinder having an armature; and a connecting means for connecting an operator of the hydraulic cylinder and the slide portion, and interlocking the actuator and the slide portion, and utilizing the drive of the hydraulic cylinder. In the insertion pin mold structure for executing the operation of inserting the insertion pin into the pin insertion hole by advancing the slide portion to the forward end thereof, the slide portion is provided on the mold, and the connecting means is provided. Contact To Rukoto
The slide portion is moved to a temporary stop position on the near side of the advance end of the slide portion and a predetermined section from the advance end.
A stop means for temporarily stopping, and a holding inclined surface formed on the fixed mold and an engaging inclined surface formed on the slide portion and having an inclination that can be brought into contact with and engaged with the holding inclined surface of the fixed mold. And the mold is
By moving toward the fixed mold, the holding tilt
Slope and the engaging inclined surfaces and are mating, the once predetermined interval from the stop position to the forward end of the slide portion, independently from actuation of the hydraulic cylinder is advanced to the slide portion, the pin with the forward inserting said and comprises a slide portion independently advancing means for generating a driving force to promote the insertion of the insertion pin into the hole, to temporarily stop position of the sliding portion, the fluid pressure Siri
The slide portion is advanced by driving the slider, and after the slide portion is once stopped, the slide portion is formed on the fixed mold.
Engaging slope formed on the sliding part
The insertion pin mold structure wherein the slide portion is advanced by contact with an inclined surface .