CN103567859B - Star ring type multi-hole position expansion clamping device - Google Patents

Abstract

The invention provides a star-ring type multi-hole expansion clamping device, which includes a V-shaped groove star-ring base frame and a circular expansion assembly. The circular expansion assembly is placed in the V-shaped groove star-ring base frame. The V-shaped groove star The ring base frame is a flat plate, which is equipped with a star ring composed of several V-shaped grooves. The circular expansion component is inserted into the V-shaped groove star ring. The circular expansion component can expand evenly in the radial direction under the action of axial force. The outer drum radially clamps the thin-walled hollow tubular member placed between the V-groove star ring and the circular expansion assembly. The present invention uses two rubber rings to radially expand the space between the outer drum and the V-shaped groove star ring to locate the thin-walled hollow tubular part, and the clamping force is uniform, which can ensure the verticality of the thin-walled hollow tubular part and avoid positioning deflection. The processing efficiency is improved, the grinding difficulty is reduced, and the end face precision of the small-diameter thin-walled hollow tubular parts is solved.

Description

Star ring multi-hole expansion clamping device

technical field

The invention relates to a fixture, in particular to a quick clamping device for grinding the two end surfaces of a thin-walled hollow tube with small diameter and high precision.

Background technique

Thin-walled hollow tube parts are parts on launch vehicles, with a small outer diameter (Φ6.35㎜), a wall thickness of 0.75, high requirements for dimensional accuracy and geometric tolerance accuracy of both ends, and large quantities. In order to ensure the flatness and dimensional accuracy requirements of both ends, the existing tooling adopts the method of cylindrical hole positioning and bolt clamping for processing. The existing problem is: because it is difficult to ensure the consistency of the shape and dimension of the thin-walled hollow tube workpiece, it is easy to cause the mismatch between the cylindrical hole of the tooling and the outer circle of the thin-walled hollow tube workpiece, causing the gap between the two to be too large, causing the The thin-walled hollow tube workpiece is in a free positioning state; due to the excessive gap, the thin-walled hollow tube workpiece will move slightly under the action of external force, and it is difficult to meet the requirements of the thin-walled hollow tube workpiece with a flatness of 0.002㎜ and a verticality of 0.005㎜ ; At the same time, the existing tooling directly locks the thin-walled hollow tube workpiece with bolts, which easily causes damage to the surface of the part.

Contents of the invention

The technical problem to be solved by the present invention is to provide a star-ring type porous position expansion clamping device, which can be positioned accurately and clamped evenly, and can effectively ensure the grinding accuracy of the flatness of the processed end face.

In order to solve the above technical problems, the star-ring type multi-hole expansion clamping device of the present invention includes a V-shaped groove star-ring base frame and a circular expansion assembly, and the circular expansion assembly is placed in the V-shaped groove star-ring base frame. The base frame of the V-shaped star ring is a flat plate, and there are two star rings in the plate, and each star ring is composed of 15 90° V-shaped grooves. The circular expansion assembly is inserted into the V-shaped star ring of the V-shaped star ring base frame, and the circular expansion assembly can expand the outer drum evenly in the radial direction under the action of axial force, and will be placed between the V-shaped groove star ring and the circle. Radial clamping of thin-walled hollow tubular workpieces between shaped expansion components.

The circular expansion assembly includes upper and lower circular pressure blocks, an intermediate ring, two rubber rings, and hexagon socket bolts. There is a stepped circle at the lower end of the upper circular pressure block, and a small convex cylinder is arranged at the lower part of the stepped circle. The upper circular pressure block There is a center hole on the top, a stepped circle on the upper end of the lower circular pressing block, and a small concave hole matching the small convex cylinder of the upper circular pressing block is arranged in the stepped circle, and a screw hole is provided in the center of the lower circular pressing block. There are two rubber rings on the step circle of the round pressing block respectively, the diameters of the two rubber rings are the same, the inner diameter of the middle ring is set on the step circle of the upper and lower round pressing blocks, the two planes of the middle ring are in contact with the rubber ring, The inner hexagonal bolt connects the upper circular pressing plate, the middle ring, two rubber rings and the lower circular pressing block together. When the inner hexagon bolts are tightened, the two planes of the middle ring are forced to press the two rubber rings in contact with it, so that the two rubber rings expand the outer drum evenly in the radial direction.

The clamping device also includes process assembly aids for the reference chassis and the reference cover, and connects the reference chassis, the V-shaped star ring base frame, the circular expansion assembly, and the reference cover through screws. The process assembly auxiliary parts are used for clamping and positioning, and are disassembled after clamping, and are not used for grinding. The main purpose is to ensure the positioning accuracy of the clamping and avoid damage to the parts. Due to the small grinding allowance, use the reference chassis and reference cover to control the reference dimensions in the length direction of the two planes of the thin-walled hollow tubular member, so as to ensure that the distance between the length of one end plane and the size of the base frame is controlled within ±0.005mm.

Compared with the prior art, the present invention has advantages and beneficial effects as follows:

The thin-walled hollow tube workpiece is positioned between the upper and lower rubber rings and the V-shaped groove star ring. The clamping force of the radially expanded outer drum of the star-shaped ring is uniform, which can ensure the verticality of the thin-walled hollow tube within the range of 0.005mm. Inside, avoid positioning deflection.

The processing efficiency is improved, the difficulty of grinding is reduced, and the processing accuracy of the end face of the thin-walled hollow tube workpiece is improved, and the flatness is within 0.002mm.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and example.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of Fig. 1;

FIG. 3 is a partially enlarged view of the internal expansion assembly of FIG. 1 .

In the figure: reference cover plate 1, thin-walled hollow tube workpiece 2, V-groove star ring base frame 3, reference chassis 4, set screw 5, circular expansion assembly 6 (including: rubber ring 7, hexagon socket bolt 8, lower Round briquetting block 9, intermediate ring 10, upper round briquetting block 11).

detailed description

As shown in Figure 1 and Figure 2, the star-ring type porous position expansion clamping device includes a V-shaped groove star-ring base frame 3 and a circular expansion assembly 6, and the circular expansion assembly 6 is placed on the V-shaped groove star-ring base frame 3 Inside, the V-shaped groove star ring base frame 3 is a flat plate, and there are two star rings in the flat plate, and each star ring is composed of 15 90° V-shaped grooves. The circular expansion assembly 6 is inserted into the V-shaped groove star ring, and the circular expansion assembly 6 can expand uniformly in the radial direction, changing the distance between the V-shaped groove star ring and the circular expansion assembly 6 . Under the action of the axial force of the inner hexagon bolt 8, the circular expansion component 6 is continuously tightened so that the rubber ring 7 deforms evenly in the radial direction. The hollow tube workpiece 2 is radially clamped, and the clamping device does not damage the part body while ensuring the positioning accuracy of the clamping.

The clamping device also includes process assembly aids for the reference chassis 4 and the reference cover plate 1, and the reference chassis 4, the V-shaped groove star ring base frame 3, the circular expansion assembly 6, and the reference cover plate 1 are connected together by positioning screws 5 . The process assembly auxiliary parts are used for clamping and positioning, and are disassembled after clamping, and are not used for grinding. The main purpose is to ensure the positioning accuracy of the clamping and avoid damage to the parts. Due to the small amount of grinding allowance, use the reference chassis 4 and the reference cover plate 1 to control the reference dimensions of the plane length direction at both ends of the thin-walled hollow tube workpiece 2 to ensure that the length of the plane at one end of the thin-walled hollow tube workpiece 2 is consistent with the V-shaped groove star ring The dimension between the base frames 3 is controlled within ±0.005mm.

As shown in Figure 1 and Figure 3, the circular expansion assembly 6 includes an upper circular pressure block 11, a lower circular pressure block 9, an intermediate ring 10, two rubber rings 7, and hexagon socket bolts 8, and there is a step at the lower end of the upper circular pressure block 11 Circle, the lower part of the step circle is processed with a small convex cylinder, the upper circle pressing block 11 is processed with a center hole, the lower round pressing block 9 upper end has a step circle, and the inside of the step circle is processed with a small convex cylinder matching the upper round pressing block 11 The small concave hole of the lower circle pressing block 9 is processed with a screw hole, and a rubber ring 7 is respectively installed on the step circle of the upper and lower round pressing blocks 11 and 9. The diameters of the two rubber rings 7 are the same, and the middle ring 10 The inner diameter of the upper and lower circular pressure blocks 11, 9 is set on the step circle, the two planes of the intermediate ring 10 are in contact with the rubber ring 7, and the hexagon socket bolt 8 connects the upper circular pressure block 11, the intermediate ring 10, and the two rubber rings. 7, the lower circle briquetting block 9 is connected and fixed together. When the inner hexagon bolt 8 is tightened, the two planes of the middle ring 10 are pressed against the two rubber rings 7 that are in contact with it, and the two rubber rings 7 radially expand the outer drum.

When adorning the circular expansion assembly 6, the hexagon socket bolt 8 is not locked earlier, and only plays a connecting role. Place the circular expansion assembly 6 in the two V-groove star rings of the V-groove star ring base frame 3, and hold it under the reference chassis 4, and then put 15 thin-walled hollow tube workpieces 2 into the V-shaped In the V-shaped groove of the grooved star ring base frame 3, cover the reference cover plate 1, and after making a slight adjustment to correct the zero reference, use a hexagonal wrench to lock the hexagon socket bolt 8, so that the circular expansion assembly 6 pairs of thin-walled hollow The pipe workpiece 2 generates clamping force to complete the clamping process.

To sum up, the small-diameter thin-walled hollow tube workpiece 2 is positioned between the upper and lower rubber rings 7 and the V-shaped groove star ring base frame 3, and the outer drum is uniformly expanded by the rubber ring 7 for radial clamping to ensure thin The verticality of the wall hollow tube workpiece 2 is within the range of 0.005 mm, which solves the problem of the machining accuracy of the end face of the thin-walled hollow tube workpiece 2, and its flatness reaches within the range of 0.002 mm.

Claims (3)

1. star ring type multi-hole position expansion clamping device, it is characterized in that: comprise V-shaped groove star cyclic group frame, circular expander assembly, circular expander assembly is placed in V-shaped groove star cyclic group frame, described V-shaped groove star cyclic group frame is a flat board, the star ring that several V-shaped grooves are formed is provided with in flat board, circular expander assembly inserts in the V-shaped groove star ring of V-shaped groove star cyclic group frame, and under responsive to axial force, the radial evenly external drum of circular expander assembly, changes the distance between V-shaped groove star ring and circular expander assembly.

2. star ring type multi-hole position expansion clamping device according to claim 1, it is characterized in that: described circular expander assembly comprises round briquetting, lower round briquetting, adapter ring, two rubber rings, hexagon socket head cap screw, there is a step circle upper round briquetting lower end, a little convex cylindrical is established in the bottom of step circle, upper round briquetting is provided with centre bore, there is a step circle lower round briquetting upper end, a little recessed circular hole matched with the little convex cylindrical of upper round briquetting is provided with in step circle, lower round briquetting center is provided with screw, upper round briquetting, the step circle of lower round briquetting is respectively equipped with a rubber ring, the internal diameter of adapter ring is placed on round briquetting, on the step circle of lower round briquetting, two planes of adapter ring contact with rubber ring, hexagon socket head cap screw is by upper round briquetting, adapter ring, two rubber rings, lower round briquetting fixed together.

3. star ring type multi-hole position expansion clamping device according to claim 1, it is characterized in that: described star ring type multi-hole position expansion clamping device also comprises benchmark chassis and benchmark cover plate, benchmark chassis, V-shaped groove star cyclic group frame, circular expander assembly, benchmark cover plate, as technique assembling auxiliary member, are connected by screw by the two.