JPH0720509U - Work fixture - Google Patents

Abstract

(57) [Summary] [Purpose] An object is to provide an inexpensive work fixing jig for fixing a large number of works at once with the end faces of the disk-shaped works being vertical. [Structure] A work block whose width is equal to or less than the magnetic pole distance of the magnet base is attached to a magnet base whose magnetic pole distance is larger than the width of the object to be measured so that the two magnetic poles of the N pole and the S pole of the magnet base are not straddled. In the lower part of the work block, two side pins project from the end surface of the work block and are loosely penetrated so that a preload is applied by a spring so that the distance between the two side pins is close to each work fixing jig. The disk-shaped work is inserted so that the end face is vertical and the end face is in contact with the end face of the work block while the outer periphery is in contact with the magnet base, and then the magnet base is excited. In addition, an outer frame with a slight amount of play relative to the outer dimensions of the magnet base is attached to the bottom of the outer frame, which is attachable to and detachable from the magnet base. Place.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a workpiece fixing jig used when measuring an object to be measured (hereinafter, referred to as a “workpiece”) with a three-dimensional coordinate measuring machine or the like, and particularly to a cylindrical work piece whose length is shorter than a diameter dimension (hereinafter, referred to as “workpiece”). "Disc-shaped work") is fixed to the work with a magnetic force with the end face vertical.

[0002]

[Prior art]

 When measuring a work with a three-dimensional coordinate measuring machine or the like, a method of automatically arranging many works on a table of the measuring machine is used in order to improve the efficiency of the measurement. In this case, it is necessary to attach the work piece to the table in a short time in order to improve the measurement efficiency. One of the methods is to use a magnet base (base with a built-in electromagnet or permanent magnet) and place the work piece on the top surface. There is a method of placing it directly and fixing the work with magnetic force.

Further, as a method of fixing a disk-shaped work with the end face vertically with magnetic force, a magnetic induction block having a V shape is placed on the magnet base, and the outer periphery of the work is attached to the V shape portion. There is a method of contacting them, or a method of directly contacting the outer periphery of the work with the V-shaped portion of a V-shaped magnet block (block containing electromagnets or permanent magnets) without using a magnet base. FIG. 5 shows a method of placing the magnetic induction block on the magnet base, and FIG. 6 shows a method of using the V-shaped magnet block. In FIG. 5, the magnetic guide block 30 is placed on the magnet base 10, and the work 20 is placed on the V-shaped portion of the magnetic guide block 30. Thereby, the magnetic force of the magnet base 10 acts on the work 20 via the magnetic induction block 30, and the work 20 is fixed. In FIG. 6, the work 20 is directly placed on the V-shaped portion of the magnet block 40, and the work 20 is fixed to the magnet block 40 by the magnetic force.

[0004]

[Problems to be solved by the device]

 However, the method of directly placing the work on the magnet base and fixing the work with magnetic force is such that when a disk-shaped work is placed with its end face vertical, a large magnetic force is not applied to the work, and this is a force that opposes the measuring force. There is a problem that the work cannot be fixed. In addition, both the method of placing the magnetic induction block on the magnet base and the method of using the magnet block having the V shape require that both blocks be prepared according to the number of workpieces, which is a problem of high cost. is there. The present invention has been made in view of such circumstances, and an object thereof is to provide an inexpensive work fixing jig for fixing a large number of works at a time with the end faces of the disk-shaped works being vertical.

[0005]

[Means for Solving the Problems]

 A work block whose width is equal to or less than the magnetic pole distance of the magnet base is attached to the magnet base whose magnetic pole distance is larger than the width of the object to be measured so that the two magnetic poles of the N pole and S pole of the magnet base are not straddled. In the lower part of the block, two side pins are projected from the end surface of the work block and loosely penetrated, so that a preload is applied by a spring so that the two distances come close to each other. The disk-shaped work is inserted so that the end face is vertical and the end face is in contact with the end face of the work block while the outer periphery is in contact with the magnet base, and then the magnet base is excited. Also, the above-mentioned many work fixing jigs are attached with play to the frame that has an outer frame with a small amount of play relative to the outer dimensions of the magnet base on the lower surface and is removable from the magnet base. Place it on the magnet base.

[0006]

[Action]

 The work and the work block have different magnetic poles, a magnetic field is formed between the work and the work block, and the work is magnetically attracted to the magnet base. When the outer circumference of the work is pushed so as to contact the magnet base, the two side pins open outward and contact both the work circumference and the magnet base, and the two side pins are magnetically attracted to the magnet base. Then, it is fixed and the rotation of the work is restricted. Further, the mounting positions of the individual work fixing jigs with respect to the magnet base are easily reproduced, and the individual work fixing jigs are brought into contact with the upper surface of the magnet base without being restricted by the frame.

【Example】

FIG. 1 is a side view of a work fixing jig according to an embodiment of the present invention, and FIG. 2 is a front view thereof. Further, FIG. 3 is a plan view of the entire work fixing jig in which individual work fixing jigs are attached to the frame, and FIG. 4 is a front view thereof. In FIG. 1, FIG. 2, FIG. 3, and FIG. 4, two magnetic poles of N pole and S pole are alternately provided at a constant interval on the magnet base 10, and the magnetic pole interval (magnetic pole width C and separator width The total distance D) is larger than the width B of the work 20. The width A of the work block 11 is smaller than the magnetic pole spacing of the magnet base 10, and two holes 11a are provided in the lower part of the end face to allow the two side pins 12 to freely penetrate. The two side pins 12 have an outer diameter such that the part protruding from the work block 11 abuts both the outer circumference of the work and the magnet base, and from the outer side to the inner side (the distance between the two side pins 12 decreases). Direction) is pressed by a spring 13.

When the work is attached to the work fixing jig configured as described above, the work 20 contacts the end surface of the work 20 with the end surface of the work block 11 from above while the outer circumference of the work 20 contacts the magnet base 10. To push in. As a result, the two side pins 12 open outward and come into contact with both the outer periphery of the work 20 and the magnet base 10, and the outer periphery of the work 20 balances the upward component force of the spring 13 and the mass of the work 20. It approaches the upper surface of the magnet base 10. Next, when the magnet base 10 is excited (the power switch is operated in the case of an electromagnet and the ON-OFF switching knob is operated in the case of a permanent magnet), a magnetic field is formed between the work 20 and the work block 11. The work 20 is magnetically attracted to the magnet base 10 so that the end face of the work 20 is in close contact with the end face of the work block 11 and the outer periphery of the work 20 is in contact with the top face of the magnet base 10, so that the two side pins 12 are also magnet base. Since it is magnetically attracted and fixed to 10, the rotation of the work 20 is restricted. As described above, the work 20 is fixed to the magnet base 10.

The work block 11 is attached to a frame 15 provided on the magnet base 10 by connecting pins 14. Since the shaft of the connecting pin 14 is smaller than the hole 11b of the work block 11 and the length from the lower surface of the head to the frame 15 is longer than the claw height E of the work block 11, the work block 11 is free from play with respect to the frame 15. Therefore, the work block 11 is not constrained by the frame 15 and adheres to the magnet base 10 by magnetic force. Further, since the head of the connecting pin 14 is larger than the hole 11b of the work block 11, the work block 11 attached to the frame 15 can be removed from the magnet base 10 by lifting the frame 15. The frame 15 has an outer frame 16 provided on the lower surface, which has a slight play with respect to the outer dimensions of the magnet base 10 (FIGS. 3 and 4).

[0010]

[Effect of device]

 As described above, according to the work fixing jig of the present invention, the work block is attached to the magnet base so as not to straddle the two magnetic poles of the N pole and the S pole of the magnet base, and the width of the work is Since it is smaller than the magnetic pole spacing of the magnet base, and the end surface of the work is inserted into contact with the end surface of the work block, the work and work block have different magnetic poles, and a magnetic field is formed between the work and work block. The work is magnetically attracted to the magnet base. Also, there are two side pins at the bottom of the work block that are pre-loaded by a spring to make the distance closer, so when the work is pushed in until it touches the magnet base, the work pin opens to the outside. Since the two side pins abut both the outer circumference and the magnet base and are magnetically attracted and fixed to the magnet base, the rotation of the work is restricted. In addition, attach the above-mentioned many work fixing jigs with play to the frame that has an outer frame with a small amount of play relative to the external dimensions of the magnet base on the bottom surface and is removable from the magnet base. Since it is placed, the mounting position of each work fixing jig with respect to the magnet base can be easily reproduced, and each work fixing jig contacts the upper surface of the magnet base without being restricted by the frame.

[Brief description of drawings]

FIG. 1 is a side view of a work fixing jig according to an embodiment of the present invention.

FIG. 2 is a front view of a work fixing jig according to an embodiment of the present invention.

FIG. 3 is a plan view of the entire work fixing jig attached to the frame of the embodiment according to the present invention.

FIG. 4 is a front view of the entire work fixing jig attached to the frame of the embodiment according to the present invention.

FIG. 5 is a perspective view of a method of mounting a magnetic induction block on a conventional magnet base.

FIG. 6 is a perspective view of a method using a conventional V-shaped magnet block.

[Explanation of symbols]

 10 Magnet Base 11 Work Block 12 Side Pin 13 Spring 14 Connecting Pin 15 Frame 16 Outer Frame 20 Work A Work Block Width B Work Width C Magnetic Pole Width D Separator Width E Work Block Claw Height

Claims (2)

[Scope of utility model registration request] 1. A magnet base whose magnetic pole spacing is larger than the width of the object to be measured, and a magnet whose width is less than or equal to the magnetic pole spacing of the magnet base so as not to straddle two magnetic poles of N pole and S pole of the magnet base. A work block attached to the base, two side pins that penetrate the lower part of the work block and project from the end surface of the work block, and a distance between the two side pins that is provided at the lower part of the work block. A jig for fixing a work, comprising a spring that applies a preload to the two side pins so that the work pieces approach each other. 2. The work fixing jig according to claim 1, wherein the frame is detachably provided on the magnet base, and the frame is attached with play.