JPH11300561A - Work holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for grinding a work such as a die piece capable of obtaining the high machining accuracy free from eccentricity in a spherical part of the die piece to be ground. SOLUTION: A die piece holding means having a curved surface 3b arranged opposite to a holding part of a die piece 1, a grinding machine side fitting member 4 having a curved surface 4a which is fitted to the curved surface 3b to regulate the relative angle for the holding part, and three fixing parts on the fitting member, are provided, a second fixing part formed opposite to the first fixing parts is provided on the die piece holding means, a tap hole part 9 is formed in either of the first or second fixing part, and an opening hole 6 larger in diameter than the tap hole part is formed in the other, a screw part of a bolt 11 having a head part larger in diameter than the tap hole part is screwed into the tap hole part, and the head part is abutted on a circumferential surface of the tap hole part to rigidly fix the die piece holding means and the grinding machine side fitting member 4 to each other in an angle-regulated manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece holder such as a holder for polishing a die piece for polishing a die piece for molding a glass press lens / plastic lens.

[0002]

2. Description of the Related Art It is required that a spherical portion of a glass mold die piece made of a hard and brittle material such as a cemented carbide or a SiC ceramic be formed with a high eccentricity of 10 seconds or less. Conventionally, the spherical part of this mold piece has been polished with a high-precision polishing machine.However, there is a run-out of about 0.1 μm on the work axis for supporting the mold piece on the polishing machine. As shown in FIG.
However, even if the sphere was mounted through the needle bearing 23 and polished, it was not possible to obtain a high-precision spherical portion with small eccentric runout. Japanese Utility Model Laid-Open No. 3-36631 is known as a device for adjusting the eccentric shake. However, the "floating base" of Japanese Utility Model Laid-Open No. 3-36631.
Since the eccentricity is adjusted via a spring, it is a floating support, and there is a problem that when an external force is applied to the workpiece by polishing or the like, the holding state of the workpiece changes.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a holder for polishing a die piece capable of obtaining a high-precision machining accuracy without the eccentric deviation of a spherical part of a die piece attached to a polishing machine and polished. It is an object of the present invention to provide a workpiece holder such as the above.

[0004]

In order to achieve the above object, the present invention provides a holding portion for holding a workpiece and a first curved surface portion disposed on the opposite side to the holding portion. Workpiece holding means having a second curved surface portion that fits with the first curved surface portion and adjusts the relative angle of the holding portion, and the mounting device. Three first fixing portions, a second fixing portion provided in the workpiece holding means, formed opposite to the first fixing portion, and any one of the first fixing portion and the second fixing portion A threaded portion formed on one side, a through-hole portion formed on the other side, having a larger diameter than the threaded portion, and a threaded portion inserted into the through-hole portion and screwed into the threaded portion; Fixing means having a head portion having a diameter larger than that of the through-hole portion. The workpiece holding means and the attaching means are rigidly fixed in a state where the workpiece holding means and the attaching means are adjusted in angle with each other by screwing and contacting the head with the peripheral surface of the through hole. It is a workpiece holder.

According to a second aspect of the present invention, in the workpiece holder according to the first aspect, the first curved surface portion is a convex curved surface, and the second curved surface portion is a convex curved surface. The curved surface portion is a concave curved surface.

[0006] The invention of claim 3 is based on claim 1 or 2
In the workpiece holder with adjustable eccentric run described in the above item, the screw portion is a tapped hole formed on the periphery of the concavely curved surface of the mounting means.

According to a fourth aspect of the present invention, in the workpiece holder according to any one of the first to third aspects, the holding portion faces the first curved surface. It is characterized by comprising a holder means movable on the surface.

According to the structure of the present invention, the spherical portion of the mold piece supported by the polishing machine via the mold piece polishing holder of the present invention detects the state of eccentric deviation caused by the detecting member abutting on the spherical portion. By adjusting each adjusting and fixing means between the mold piece holder member and the angle adjusting member and between the angle adjusting member and the mounting member in accordance with the eccentric shake, the eccentric shake is positioned without eccentric shake. It is.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a holder for polishing a die piece, which is a workpiece holder of the present invention.
Reference numeral 1 denotes a die piece which is a workpiece made of SiC ceramics having a spherical portion 1A to be polished.
Is supported by the mounting portion 2a of the mold piece holder member 2.
In this case, the inner diameter of the mounting portion 2a is made easier dimensions out of the mold piece 1, a plurality of tapped holes 2a ₁ are formed at intervals of 120 degrees to the mounting portion 2a, tap holes 2a of the plurality of _The mold piece 1 is fixed by the screw inserted into ₁ .

The die piece holder 2 has a horizontal flange 2b at the lower end of the mounting part 2a of the die piece holder 2 so that it can be adjusted in a direction perpendicular to the rotation axis of the die piece 1. The horizontal flange-shaped portion 2b is formed and fixed to the horizontal flat portion 3a of the angle adjusting member 3. The horizontal flange portion 2b is provided with a first adjusting and fixing means which can adjust the eccentric deviation of the spherical portion with respect to the horizontal flat portion 3a. The work piece holding means is constituted by the mold piece holder member 2 and the angle adjusting member 3.

The angle adjusting member 3 includes the horizontal flat portion 3
a, and a curved surface 3b on the opposite surface of the flat portion 3a to enable angle adjustment. The curved surface 3 b of the angle adjusting member 3 is formed by a curved surface 4 formed on the grinder-side mounting member 4.
a and is fixed. The curved surface 3b of the angle adjusting member 3 is provided with a second adjusting / fixing means which can adjust the eccentric deviation of the spherical portion with respect to the curved surface 4a of the grinding machine side mounting member 4.

The grinding machine side mounting member 4 is provided with the curved surface 4a.
And a screw hole 4b for fixing the grinder-side mounting member 4 to the grinder on the opposite surface of the curved surface 4a.

As the first adjusting and fixing means R ₁ capable of adjusting the eccentric deviation of the spherical portion, four tap holes 5 are formed in the horizontal plane portion 3 a of the angle adjusting member 3. The flange-shaped portion 2b of the mold piece holder member corresponding to the portion 5 includes:
By forming an opening 6 larger than the tap hole 5 and providing the opening 6 larger than the tap hole 5, the die piece holder member 2 is displaced back and forth and left and right with respect to the angle adjusting member 3. be able to.

After adjusting the position of the mold piece holder member 2 with respect to the angle adjusting member 3, the bolt 7 is screwed into the tap hole portion 5 through the washer 8 and the opening hole 6, whereby the angle adjusting member is adjusted. The mold piece holder member 2 is fixed to 3.

As the second adjusting and fixing means R ₂ capable of adjusting the eccentric deviation of the spherical portion, three tap holes 9 are formed on the peripheral edge of the curved surface 4 a of the grinding machine side mounting member 4. In the extension 3c of the horizontal plane portion 3a of the angle adjusting member 3 corresponding to the hole 9, an opening 10 larger than the tap hole 9 is formed, and the opening 10 larger than the tap hole 9 is provided. As a result, the curved surface 3b of the angle adjusting member 3 can be displaced with respect to the curved surface 4a of the grinding machine side mounting member 4.

After adjusting the position of the angle adjusting member 3 with respect to the grinding member side mounting member 4, the bolt 11 is
2. By being screwed into the tap hole 9 through the opening hole 10, the angle adjusting member 3 is fixed to the polishing machine side mounting member 4.

The adjustment of the first adjusting and fixing means R ₁ and the second adjusting and fixing means R ₂ is performed by supporting the mold piece 1 on the holder for mold piece polishing of the present invention. This is performed after the holder is mounted on the polishing machine through the drive shaft mounting screw holes 4b.
At this time, the electric micro-measuring element 13 is brought into contact with the spherical portion 1A of the rotating mold piece 1,
3 is read by the meter 14, and the mold piece 1
Of detecting the eccentric motion of the spherical portion 1A, thus eliminating the eccentric motion of the spherical portion. 1A, adjusting the first adjustment locking means R ₁ and the second adjusting locking means R _2.

Then, by polishing the spherical portion 1A of the mold piece 1 which rotates without eccentric deflection by a grinder, a mold piece having a highly accurate spherical portion 1A can be obtained.

Further, a mold piece holder member 2 for holding the mold piece 1 and a convex curved surface 3b disposed on the opposite side to the mold piece holder member 2 are provided with workpiece holding means. The polishing machine side mounting member 4 is provided with a concave curved surface 4a fitted to the convex curved surface 3b, so that the center of gravity of the adjusted side including the mold piece 1 and the adjusted side by the uneven curved surface portion. And the center of rotation is arranged close to each other, so that when the relative angle is adjusted, the fluctuation of the center of gravity can be reduced (that is, the amount of displacement of the center of gravity can be made smaller than the amount of adjustment movement). . Since the fluctuation of the position of the center of gravity on the adjusted side is small as described above, it is possible to perform the adjustment stably especially when adjusting the minute rotational shake of about 0.1 μm, and to perform the highly accurate axial alignment of the mold piece 1. Becomes possible.

Further, since the convex curved surface 3b is arranged on the opposite side to the mold piece holder member 2 for holding the mold piece 1 on the work holding means, the mass of the work holding means is increased. The distribution can be deviated near the center of gravity, the moment of inertia at the center of rotation of the workpiece holding means on the adjustment side due to the uneven curved surface portion can be reduced, and the deflection during adjustment can be reduced to reduce the die piece. 1. Highly accurate axis alignment becomes possible.

Further, since the amount of fluctuation of the position of the center of gravity and the moment of inertia are small and the polishing member side mounting member 4 has a concave curved surface 4a, it is possible to prevent the workpiece holding means from falling on the uneven curved surface by sliding. Can be prevented.

[0022]

As described above, according to the configuration of the present invention, the eccentric runout of the workpiece can be rigidly held to a state close to zero. It has the effect that a precision glass press lens〓plastic lens can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a holder for polishing a die piece according to the present invention.

FIG. 2 is a schematic sectional view of a conventional holder for polishing a die piece;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mold piece 1A spherical part 2 Mold piece holder member 3 Angle adjustment member 4 Grinding machine side attachment member 13 Electric micro-measuring element R ₁ First adjustment and fixing means R ₂ Second adjustment and fixing means

Claims (5)

[Claims] 1. Workpiece holding means having a holding portion for holding a work piece and a first curved surface portion disposed on an opposite side to the holding portion; and the first curved surface portion; Attachment means having a second curved surface portion for fitting and adjusting the relative angle of the holding portion, three first fixing portions provided in the attachment means, and the workpiece holding means A second fixing part formed opposite to the first fixing part, a fastening part formed on one of the first fixing part and the second fixing part, A through hole having a diameter larger than that of the fastening portion, a fastening portion having a head to be inserted into the through hole and fastened to the fastening portion, and a head having a diameter larger than that of the through hole; A fastened portion of the fixing means is fastened to the fastening portion, and the head is connected to the through hole portion By abutting the peripheral surface, the workpiece holder, wherein the workpiece holding means and the attachment means are rigidly fixed in a state of being angle adjustment together. 2. The workpiece holder according to claim 1, wherein said fixing means is a bolt, and said fastening portion is a screw portion. 3. The workpiece holding device according to claim 1, wherein the first curved surface portion is a convex curved surface, and the second curved surface portion is a concave curved surface. Utensils. 4. The workpiece holder according to claim 2, wherein the threaded portion is a tapped hole formed on a peripheral edge of the concavely curved surface of the mounting means. 5. The workpiece according to claim 1, wherein said holding portion is constituted by holder means movable on a surface facing said first curved surface. Object holder.