JPH0740164A - Work holder - Google Patents

Abstract

PURPOSE:To provide a work holder which can be formed to the shape conforming to the outer shape of a work in a simple manner with high general- purpose performance. CONSTITUTION:An opened port part 12 is formed on a holder body 10. When a number of pins 18 are shiftable in the lengthwise direction, and the top edge is inserted to the opened port part 12 so as to project outwardly from the opened port part 12. Holding mechanisms 22a, 22b, 24b and 24c hold each position for the opened port part 12 of a number of pins 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work holder, and more particularly to a work holder capable of holding a work having an unspecified outer shape.

[0002]

2. Description of the Related Art When a workpiece having an unspecified shape such as a cast product is finished, a work holder is required to hold the workpiece in a stable manner. Further, when machining such a work, a work holder is used to hold the work in a suitable posture according to the working mode. Conventionally, this type of work holder is formed by engraving a recessed portion having a shape that conforms to the outer shape of the workpiece to be held on a block body having a stable shape or a block body that can be held by a chuck device of a processing machine. It had been. When the work is fitted into the concave portion of the work holder at the time of processing, the work can be held in a stable posture or a desired posture, and predetermined machining can be performed.

[0003]

However, the above-mentioned conventional work holder has the following problems. Since the concave portion of the work holder is engraved according to the outer shape of the work to be held, it takes time to form the work holder and the economy is poor. In addition, since the work holder cannot be used for works other than works matching the shape of the concave portion, there is a problem that the work holder has to be prepared for each kind of work and has no general versatility. Therefore, it is an object of the present invention to provide a work holder having high versatility and capable of easily forming a shape that follows the outer shape of a work.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a holder main body provided with an opening, a large number of pins that are movable in the length direction, and have a tip protruding outward from the opening, and a plurality of pins inserted into the opening of the holder main body. And a holding mechanism for holding the position of the above with respect to the opening. Further, the above work holder may be provided with a restricting mechanism for restricting the protrusion amount of the pin with respect to the opening.

[0005]

[Operation] The operation will be described. A large number of pins are inserted so that they can move in the length direction and their tips can project outward from the opening of the holder body. Therefore, when the tips of the many pins are brought into contact with the outer surface of the work to be held, the surface formed by the tips of the pins has a surface shape that follows the outer surface of the work. When the holding mechanism is operated in this state, the surface formed by the tip of the pin can be held in the surface shape. In particular, when the regulation mechanism is provided, the amount of protrusion of the pin with respect to the opening can be regulated, so that the pin can be prevented from being pulled out from the holder body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. (First Embodiment) A first embodiment will be described with reference to FIG. Reference numeral 10 denotes a holder body, which is made of metal (for example, iron) and has a box shape. A rectangular opening 12 is provided on the upper surface of the holder body 10. Female screw holes 14a, 14b, 14c are formed in the side surface of the holder body 10. In the first embodiment, the bottom surface 16 of the holder body 10 is formed into a flat surface, so that the holder body 10 can be stably installed on a horizontal plane.

Reference numeral 18 denotes a pin, which is made of metal (for example, iron). Each pin 18 is formed in a square pole shape having a square cross section. A large number of pins 18 are arranged in a matrix so that their outer peripheral surfaces are in contact with each other. The pin 18 is inserted into the opening 12 and is movable in the length direction. The upper end of the pin 18 can be projected upward and outward from the opening 12. Reference numeral 20 denotes an inner holder, which is made of elastic metal (for example, spring steel). Inner holder 20
Is formed in a rectangular cylinder shape having open upper and lower ends, and a large number of pins 18 are inserted in a matrix form inside. The inner holder 20 can be slid into the holder body 10. A female screw hole 1 is formed on the side surface of the inner holder 20.
A female screw hole 15 is formed corresponding to 4a. Extending pieces 22a and 22b are extended downward on the lower side and both sides of the inner holder 20.

Reference numeral 24a is a connecting bolt, which is screwed into coaxial female screw holes 14a and 15 to form an inner holder 2
0 can be fixed in the holder body 10. 24
b and 24c are holding bolts, respectively, which are female screw holes 14
It is screwed to b and 14c. Holding bolts 24b, 24
When c is screwed in, the tip contacts the extension pieces 22a, 22b of the inner holder 20 and pushes the extension pieces 22a, 22b inward (state of FIG. 1). By this pushing, the inner holder 20 is elastically deformed, the downward movement of the pin 18 is limited, and the position of the pin 18 with respect to the opening 12 is maintained. On the other hand, when the holding bolts 24b and 24c are loosened, the extension pieces 22a and 22b return to their original positions by their elastic restoring force, and allow the pin 18 to move in the length direction. Therefore, in this embodiment, the inner holder 20 and the holding bolt 24 are
A holding mechanism is constituted by b and 24c.

When the work holder 26 of the first embodiment is used to hold the work 26 having an unspecified shape, for example, the holding bolts 24b and 24c are first loosened so that the pin 18 can move in the longitudinal direction. In that state, the lower surface of the work 26 and the pin 1
8 abutting on the upper end of the pin 18
The position follows the bottom surface. When the position of the upper end of the pin 18 is determined, the holding bolts 24b and 24c are screwed in to make the pin 18 immovable. As a result, the work 26
Can be stably held.

(Second Embodiment) A second embodiment will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. The second embodiment is an embodiment having a holding mechanism different from that of the first embodiment. Reference numeral 24d is a positioning bolt, which is screwed into a female screw hole 14d that is provided through the side surface of the inner holder 20. By screwing in the positioning bolt 24d, the tip pushes the pressing plate 28a in the horizontal direction to push the pin 18. By this pressing, the position of the pin 18 with respect to the inner holder 20 can be fixed. Reference numeral 30 denotes a first wedge body, which is arranged in the holder body 10. The upper surface of the first wedge body 30 is formed in a horizontal plane. In this embodiment, since the lower ends of all the pins 18 are at the same height position, all the pins 18 can be supported by the upper surface of the first wedge body 30. The lower surface of the first wedge body 30 is formed as an inclined surface. The first wedge body 30 can move in the vertical direction, but cannot move in the horizontal direction.

Reference numeral 32 denotes a second wedge body, which is the holder body 10.
It is arranged inside. The upper surface of the second wedge body 32 is formed as a slope corresponding to the slope of the first wedge body 30. Second
The wedge body 32 is movable in the horizontal direction. 24e
Is a holding bolt, which is screwed into a female screw hole 14e that is provided on the side surface of the holder body 10. Holding bolt 2
The tip of 4e protrudes into the holder body 10 and the second wedge 3
It is possible to contact the side surface of No. 2. When the holding bolt 24e is screwed in, the holding bolt 24e pushes the second wedge body 32 to the right and pushes the first wedge body 30 upward. By this pushing movement, the first wedge body 30 can be moved to the position where the lower ends of all the pins 18 are located on the upper surface, and the lower movement of the pins 18 can be prevented.

In the second embodiment, the position of the upper end of the pin 18 is set in advance to a position corresponding to the lower surface of the work 26, and the pin 1
It is necessary to align the position of the lower part of 8. The method will be described with reference to FIG. Work 26 to be held by pin 18
The work 26 is set on the jig 34 with its surface (lower surface in this embodiment) facing up. The inner holder 20 is positioned horizontally on the work 26 with the positioning bolt 24 loosened, that is, with the pin 18 movable with respect to the inner holder 20. Then, the pin 18 that moves downward due to gravity stops moving downward at the position where it abuts the work 26 (state in FIG. 3). When the positioning bolt 24 is screwed in in this state, the pressing plate 28a is pushed in the horizontal direction and the pin 18
Press. As a result, the position of the pin 18 with respect to the inner holder 20 is fixed.

After the position of the pin 18 with respect to the inner holder 20 is fixed, the lower end of the pin 18 is cut along the alternate long and short dash line 36 by a processing machine such as a grinder equipped with a rotary grindstone to align the lower ends. The inner holder 20 is set in the holder body 10 with the lower end positions of the pins 18 aligned, and the connecting bolt 24a is screwed in to fix the inner holder 20 in the holder body 10. After that, as described above, by screwing the holding bolt 24e, the upper surface of the first wedge body 30 is brought into contact with the lower end of the pin 18, and the downward movement of the pin 18 is prevented.

(Third Embodiment) A third embodiment will be described with reference to FIG. The same members as those in the preceding embodiment are designated by the same reference numerals as those in the preceding embodiment, and the description thereof will be omitted. 1st Example and 2nd Example (4th Example mentioned later, 5th)
The same applies to the embodiment), since the pin 18 is movable in the longitudinal direction, the inner holder 20 can be moved to the pin 1
8 may come off. Therefore, in the third embodiment, a regulation mechanism for regulating the protruding amount of the pin 18 with respect to the opening 12 of the holder body 10 is provided. Specifically, the pins 18 arranged in a matrix in the inner holder 20.
A plurality of regulation pins 38 are horizontally installed in each column or each row. Each regulation pin 38 is provided with a regulation hole 40 in the vertical direction, which is provided through each pin 18 in the corresponding column or row.
Has been inserted into. Therefore, since the vertical movement of the pin 18 is limited to the length range of the restriction hole 40, the pin 18 will not be pulled out from the inner holder 20.

In the third embodiment, the regulation mechanism including the regulation pin 38 and the regulation hole 40 is shown as an example of the regulation mechanism.
In addition, as the regulation mechanism, for example, a mechanism in which one end of a thin string-shaped member is fixed to the inner end portion of each pin 18 and the other end of the string-shaped member is fixed in the holder main body 10 can be adopted. In addition, as shown in FIG. 4, when it is desired to prevent the pin 18a corresponding to the position deviated from the work 26 from being excessively moved downward when the upper end of the pin 18 is positioned to follow the outer shape of the work 26. Is provided with a flange-shaped movement restricting member (which can be formed of clay, for example) on the outer periphery of the work 26,
The movement of the pin 18 may be restricted.

(Fourth Embodiment) A fourth embodiment will be described with reference to FIG. The same members as those in the preceding embodiment are designated by the same reference numerals as those in the preceding embodiment, and the description thereof will be omitted. The fourth embodiment is also an embodiment having a different holding mechanism. Four
Reference numeral 2 denotes a steel ball, which is inserted into the multiple holder body 10. The steel ball 42 can be inserted through a female screw hole 14f formed through the side surface of the holder body 10. After the steel ball 42 is inserted, the closing bolt 24f is screwed into the female screw hole 14f to be closed (state of FIG. 5).

28b is a pressing plate, which is made of metal (for example, iron)
Is formed by. The pressing plate 28 can move up and down in the holder body 10. A holding bolt 24g is screwed into a female screw hole 14g formed through the lower surface of the holder body 10. The tip of the holding bolt 24g is in contact with the lower surface of the pressing plate 28 in the holder body 10. Holding bolt 2
When 4g is screwed in, the upper end of the holding bolt 24g is pressed by the pressing plate 2.
Move 8b up. With this upward movement, the steel ball 42 is also pushed upward. As a result, a large number of steel balls 42 can be brought into contact with the lower ends of the pins 18 to prevent the pins 18 from moving downward.

(Fifth Embodiment) A fifth embodiment will be described with reference to FIG. The same members as those in the preceding embodiment are designated by the same reference numerals as those in the preceding embodiment, and the description thereof will be omitted. The fifth embodiment is also an embodiment having a different holding mechanism. Four
Reference numeral 4 denotes a piston, which is slidable in a horizontal direction in a cylinder hole 46 that is provided through the side wall of the holder body 10. Reference numeral 24h is a holding bolt, which is screwed into a female screw hole 14h formed transparently in the holder body 10. The tip of the holding bolt 24h projects into the cylinder hole 46, and is transparently provided on the right end surface of the piston 44. Therefore, the piston 44 can be pushed leftward by screwing the holding bolt 24h.

Reference numeral 48 denotes a pressure oil bag, which is made of, for example, synthetic rubber in a bag shape and is easily elastically deformable.
The pressure oil bag 48 is filled with pressure oil 50. Therefore, when the piston 44 is pushed to the left, the piston 44
The pressure acting on the pin 18 pushes the lower end of the pin 18 upward through the pressure oil 50 in the pressure oil bag 48, and the downward movement of the pin 18 can be prevented. An O-ring 52 is provided to prevent the pressure oil 50 from leaking. The pin 18
A filling material (not shown) is filled between the lower end surfaces of the two, and together with the O-ring 52, leakage of the pressure oil 50 is prevented. In the present embodiment, the example in which the pressure oil 50 is put in the pressure oil bag 48 has been introduced, but if the inside of the holder body 10 is sufficiently sealed, the pressure oil 50 does not necessarily have to be put in the pressure oil bag 48.

Various preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. For example, the shape of the holder body is not particularly limited, and the working environment of the work holder is not limited. The positions where the bolts and the like are arranged can be arbitrarily set by the above. Further, in the case of the work holder to be attached to the processing machine, a structure and means for attaching to the processing machine may be provided. Further, for example, two work holders according to the present invention may be provided, and the work may be held from both sides so as to be processed or set in a processing machine. For example, many modifications can be made without departing from the spirit of the invention. Of course, it can be given.

[0021]

When the work holder according to the present invention is used,
A large number of pins are inserted so that they can move in the length direction and their tips can project outward from the opening of the holder body. Therefore, when the tips of the many pins are brought into contact with the outer surface of the work to be held, the surface formed by the tips of the pins has a surface shape that follows the outer surface of the work. When the holding mechanism is operated in this state, the surface formed by the tip of the pin can be held in the surface shape, so that a shape that follows the outer shape of the work can be formed in a short time, and workability is improved. It is possible to improve the economy and economy. Also, since many pins can be moved in the length direction, it is possible to easily adapt to various works by preparing one kind of work holder.
It becomes possible to have versatility. In particular, when the regulation mechanism is provided as in claim 2, since the protrusion amount of the pin with respect to the opening can be regulated, it is possible to prevent the pin from being pulled out from the holder main body, and it is easy to handle.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a work holder according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the work holder according to the present invention.

FIG. 3 is a cross-sectional view showing a method of determining the height of a pin in a shape following the shape of the work in the work holder of the second embodiment.

FIG. 4 is a partial sectional view showing a third embodiment of the work holder according to the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the work holder according to the present invention.

FIG. 6 is a sectional view showing a fifth embodiment of the work holder according to the present invention.

[Explanation of symbols]

 10 Holder Main Body 12 Opening 18, 18a Pin 20 Inner Holder 22a, 22b Extension Piece 24b, 24c, 24e, 24g, 24h Holding Bolt 26 Work 30 First Wedge Body 32 Second Wedge Body 38 Control Pin 40 Control Hole 42 Steel ball 44 Piston 48 Pressure oil bag 50 Pressure oil

Claims (2)

[Claims] 1. A holder main body provided with an opening, and a large number of pins which are movable in the length direction and whose tips are inserted into the opening of the holder main body so as to project outward from the opening. And a holding mechanism for holding the positions of a large number of pins with respect to the opening. 2. The work holder according to claim 1, further comprising a restriction mechanism for restricting a protrusion amount of the pin with respect to the opening.