JPH0623447A - Device for operating press tool and member such as core and side core of metal injection die - Google Patents

Abstract

PURPOSE: To enable sure lock using a low hydraulic pressure by providing a bevel part for one end of the plunger of a pressure medium actuating cylinder and by moving a lock segment to the outside of a radiant direction in cooperation with the complementary bevel surface of the lock segment. CONSTITUTION: The lock of an operating rod 18 for holding a core, side core, etc., is performed by a pressure medium actuating cylinder 6. Its plunger 13 is provided with a bevel end face 15 with which the complementary inner side face of the lock segment 27 comes into contact. The plunger 13 is connected to the operating rod 18 by a bolt 21, and is moved for a short distance for the operating rod against a spring 24 action. When released, the plunger 13 is pushed into the cylinder 6 by a hydraulic pressure against the spring 24 action, with the lock segment 27 taking an inoperative position. Then, the plunger 13, accompanied by the operating rod 18, continues its operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for operating members such as a core and a side core of a press tool and an injection mold. More specifically, the present invention relates to a device for fixedly holding these members so as not to move in a part of an injection operation or a pressing operation.

[0002]

Devices of the above type are known in the art. Usually these devices consist of a separate unit connected to a press tool or injection mould, the member to be operated being connected to the working rod of said unit, said working rod being actuated by a pressurized medium actuated cylinder. It is possible to move between a position and an inactive position. A plurality of locking segments are used, these locking segments being engaged or disengaged in the annular groove of the actuation rod by a movable sleeve which is spring-loaded by a locking spring, the actuation rod being in one of its two end positions, Normally locked in the protruding position.

Such a known device consists of a hydraulic cylinder, to the plunger of which the working rod is connected. The working rod extends through a block axially connected to a hydraulic cylinder, the block having a hole for allowing the working rod to pass through and a recess, the diameter of the recess being for the working rod and the working rod in the block. An inner annular flange is positioned between the holes and has a diameter such that one end of the plurality of lock segments abuts the flange. The locking segments have a radial extension of less than half the difference in diameter between the recess and the bore of the actuation rod and are evenly distributed along the outer circumference of the actuation rod. The end surface of the lock segment opposite to the end surface adjacent to the flange is different from the first end surface which is not perpendicular to the longitudinal axis of the working rod, and is different from the first end surface in the first acute angled surface in the portion close to the center of the working rod. And forms a second obtuse angle surface in the other part.

The actuating rod further comprises an annular groove having a lateral angle corresponding to the first acute angle of the locking segment. A further movable hollow lock sleeve is arranged in the recess of the block,
The sleeve is elastically pressed against the locking segment and thus also against the annular abutment flange of the block.

When the plunger of the hydraulic cylinder and thus the actuation rod are in the retracted position, the locking segment is completely outside the actuation rod, so that the actuation rod can be moved into the bore in the block. When the hydraulic cylinder is actuated to push the plunger out, the actuation rod is free to move with respect to the block. However, when the annular grooves of the actuating rod align with the lock segments, these lock segments are forced into the corresponding grooves.
This is because the beveled surface of the elasticized locking sleeve cooperates with the second beveled surface of the lock segment to move the lock segment toward the central axis of the actuation rod. In this condition one part of the lock segment is located in the groove and the other part is outside the groove and the outer part of the lock segment is in contact with the inner part of the lock sleeve The core or similar is locked to prevent it from moving.

When the hydraulic cylinder is moved in the reverse direction,
Some of the pressure oil passes through the channels in the block into the space between the abutment flange of the block and the lock sleeve, so that the lock segment is moved against the resilience until it exits the lock sleeve. Thereupon, the locking action is released and the plunger and actuating rod of the hydraulic cylinder can return to their initial retracted position.

[0007]

However, the above-mentioned device has a few serious problems.

The diameter of the actuating rod is much smaller than the diameter of the hydraulic plunger due to the need for an abutment flange to abut the end face of the lock segment.

Since the force exerted by the locking device is proportional to the pressure surface corresponding to said small diameter, the diameter of the hydraulic cylinder must be increased by a corresponding amount. This constitutes a serious drawback due to the space constraints of the tool and the press.

Operation is not as reliable as necessary because the locking segment is brought into the locking position only by the elastic force acting on the locking sleeve.

Since the hydraulic pressure acts only on the annular surface having the diameter of the cylinder hole as the outer diameter and the diameter of the actuating rod as the inner diameter, the return force of the hydraulic cylinder is low. Therefore, the hydraulic pressure must be selected high. .

The total length of the hydraulic cylinder and the block is large, and the structure is complicated.

It is necessary to arrange a separate abutment ring between the flange and the locking segment, since said channel must penetrate through the annular flange of the block, for example.

[0014]

The object of the present invention is therefore to:
By providing a simple, relatively inexpensive device that has a small size suitable for being incorporated into a tool or mold and that can make a very effective secure lock using a relatively low hydraulic pressure. To solve the above problems and other problems of the prior art structures.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.

The novel device according to the invention comprises a substantially cylindrical first main part 1, which has a thread connection 2 by means of which the device 2 is for example to an injection mold. The cores or similar members can be connected to operate. The main member 1 has a first central hole 3a, and this hole 3a
Is continuous with a slightly wider hole 3b, this hole 3b is continuous with a wider hole third hole 3c, this hole 3c is continued with a wider fourth hole 3d, and this fourth hole 3d is an inner thread portion. It ends in 4. That is, the first main member 1 has a tubular shape. It has a radial screw hole 5 in its wide portion, and this screw hole 5 is for receiving a nipple for supplying a pressurized medium. The device further comprises a tubular second main member 6. The main member 6 is fixed to the main member 1 by the thread portion 7 thereof, is hermetically connected and extends coaxially. The threaded portion 7 has a straight end face 8 which is continuous with the bevel face 9 for the following purposes.

The main member 6 has an inner thread 10 at its end opposite to the threaded portion 7 to which a cylindrical end member 11 having an outer thread is screwed, the end member being threaded. 11 is a screw hole 12 of the nipple for supplying the pressurized medium
Have.

A plunger 13 is movably arranged in the second main member 6. This plunger has a sealing ring 1
4 or the like to seal against the inner surface of the main member 6. Further, the plunger 13 has a beveled portion 15 at the left end of the drawing, and the plunger 13 has a through opening formed of holes 16a, 16b, 16c having different diameters.

The plunger 13 is operatively connected to a flange portion 17 of an actuating rod 18, which at its free end has a threaded portion 19 for connecting to a manipulated core or the like. The rod 18 is also provided with an outer key 20 at this end to facilitate the connection to the core or the like. To operatively connect the rod 18 and the plunger 13, a bolt 21 is provided, the thread 22 of which is screwed into the flange portion of the operating rod 18 and is preferably connected by a through pin. The plunger 13 is sealed to the bolt 21 by a sealing ring 23 or the like. A compression spring 24 is provided between the head of the bolt 21 and the abutment surface between the holes 16a and 16b so that the plunger 13 opposes the action of the spring 24 against the actuating rod as seen in FIG. The movable distance corresponds to the distance between the head of the bolt 21 and the contact surface between the holes 16b and 16c of the plunger 13.

The annular space between the actuating rod 18 and the hole 3b of the first main member 1 comprises a single or a plurality of channels 25.
Communicates with the right end surface of the operating rod 18.

As can be seen from the attached drawing, the plunger 1
A circular space 26 is formed between the left side end surface of No. 3 and the adjacent end surface of the operating rod 18.

A plurality of locking segments 27 are arranged between the flange portion 17 of the actuating rod 18 and the sleeve 6, each segment 27 having a straight end face 28 and a tapered inner bevel substantially the same as the bevel face 15. Face 29
And an end portion opposite the end surface 28, which has a straight end surface as well as an outer bevel surface 30 which forms an obtuse angle with the actuation rod 18.

The device described above operates as follows.

In the position shown in FIG. 2, the actuation rod 1
8 is in its retracted position.

By supplying a pressurized medium such as pressure oil to the cylinder composed of the main member 6, the plunger 13 is moved to the left side. The lock segment 27 is then in the retracted position, but due to the action of the cooperating bevel surfaces 15 and 29, the segment 27 is subject to a constant force tending to displace it from the center of the actuation rod 18.

When the plunger reaches the position shown in FIG. 1, the locking segment is pushed outwards by the cooperating bevel surfaces 29, 30 to assume the locking position shown in FIG. 1, in which position: By contacting the bevel end surface 9 of the main member 6, these lock segments 27 lock the operating rod 18 so as not to move inward. In this position, the lock segment is held by hydraulic pressure as well as spring 24. This lock is completely play free.

A pressurized medium, such as oil, is introduced through the opening 5 to retract the actuation rod 18 to the position shown in FIG. 2 and to cause the retraction of a core or the like connected to the actuation rod.

First, oil enters the space 26 through the channel 25 (at the same time it enters the middle of the mutually spaced lock segments 27), which causes the plunger 13 to move to the right against the action of the spring 24. Then, the head of the bolt 21 comes into contact with the plunger contact surface between the holes 16b and 16c. In this way, when the plunger moves to the right side by hydraulic pressure, the lock segment 2
7 is pressed into the main member 6.

In the embodiment shown in FIG. 3, the spring 2
4 has been eliminated and is configured to increase the locking capability as well as reduce manufacturing costs and improve function by a pin connection with some axial play between the sleeve 13 and the actuation rod 18. By providing the main member with sensor elements 32a and 32b for cooperating with the plunger 13 and the actuating rod 17, these sensor means can provide a signal to the actuating member of the actuating tool or die.

[Brief description of drawings]

1 is a longitudinal section view of the novel device according to the invention with the actuation rod arranged in the outer locking position, FIG.

2 is a cross-sectional view similar to FIG. 1 with the actuating rod retracted inward in the released position.

FIG. 3 is a similar cross-sectional view of a device according to another embodiment of the present invention.

[Explanation of symbols]

 1 1st Main Member 5 Pressure Oil Supply Hole 6 2nd Main Member (Cylinder) 9 Bevel Surface 12 Pressure Oil Supply Hole 13 Plunger / Sleeve 15 Bevel Surface 17 Flange 18 Actuating Rod 22 Connecting Bolt 25 Pressure Oil Channel 27 Lock Segment 28 End Face 29 inner bevel surface 30 outer bevel surface 31 connecting pin 32a, 32b sensor

Claims (8)

[Claims] 1. An actuating means (18) to which an operated core or cores or the like is connected, said actuating means (18) being actuated and deactuated by a pressurized medium actuated cylinder. Movable between them, whereby a plurality of locking segments (27) of the locking sleeve (13) lock the actuating means (18) or actuating means (18).
And tool for operating a member such as a core and a side core of a press tool and an injection mold, which are configured so as to release the pressurizing medium and freely move the operating means (18) by the pressurized medium actuated cylinder. In a device including a coupling unit for the pressurizing medium actuated cylinder, the plunger (13) at the same time forms a locking sleeve, so that at its one end it is provided with a bevel portion (15), which bevel portion (15) comprises a locking segment (15). 27) in cooperation with a complementary beveled surface (29) of said locking segment (2
7) A device for operating members such as a press tool and a core and side core of an injection mold, which is characterized by moving 7) outward in the radial direction. 2. A cylinder (6) comprises or is sealingly connected to the end portion (1), the end portion (1) being in its longitudinal part a cylinder (6). ), The longitudinal part of this cylinder (6) receives the locking segment (27) and the end flange of the actuating means, said locking segment (27) having an end face (28). In contact with the end flange of the actuating means and in the locked position by the beveled portion (30) of the other end surface against the corresponding complementary surface (9) of the cylinder (6), the plunger (13) in the locked position. With its bevel portion (15), the inner complementary bevel surface (29) of the lock segment (27)
And the plunger (13) is moved inward to a position where the lock segment (27) is moved radially inward, so that the lock segment (27) and the plunger (1
Device according to claim 1, characterized in that 3) and are arranged in the cylinder (6) itself to release the locking action. 3. The plunger (13) is such that it carries with it the actuating means (18) when it is moved inward, but within the limits of its movement. Device according to any one of the preceding claims, characterized in that it is connected to (18). 4. The plunger (13) is hollow and is connected to an actuating means (18) by a bolt (21) or the like, the head of said bolt being the movement of the plunger (13) relative to the actuating means (18). A spring (24) is provided for limiting the pressure and for constantly crimping the plunger (13) to the flange (17) of the actuating means (18) via the locking segment (27). 1
4. The apparatus according to any one of 3 to 3. 5. A cylinder (6) having an end member (11) at one end.
Closed by means of which the end piece (11) comprises a nipple through which the pressurized medium is fed into the cylinder (6).
Of the plunger (13) inside the cylinder (6) and the supply of the pressurized medium to the other side of the plunger (13) inside the cylinder (6) is inside the flange (17) of the actuating means (18). Device according to any of the preceding claims, characterized in that it is carried out through an opening (25) provided in the. 6. A lock segment (27) in the axial direction.
Is determined such that in the locked position there is an annular space (26) between the flange (17) of the actuating means (18) and the plunger (13) and the opening (25) of the pressurized medium is Device according to any of the preceding claims, characterized in that a pressurized medium is supplied into the space (26). 7. A sleeve (1) for eliminating the need for a spring or the like between the sleeve (13) and the actuating means (18).
Device according to any one of the preceding claims, characterized in that a pin connection (31) is provided between the 3) and the actuating means (18) with some axial play. 8. A hydraulic cylinder (1, 6) is a sensor means (3).
2a, 32b), these sensor means being able to control the actuating tool or the actuating member of the mold in cooperation with the actuating means (18) and / or the locking sleeve (13). 4. The device according to any one of 4.