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Expanding type mandrel clamp

An expansion-tightening, mandrel technology, which is applied in the direction of expanding mandrels, manufacturing tools, gear teeth, etc., to achieve the effects of easy production, high positioning accuracy and simple structure

Active Publication Date: 2011-08-24
JIANGSU AIRSHIP GEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution is relatively complicated, and the matching accuracy of the tapered needle roller and the tapered shaft is high, the manufacturing is difficult, the installation technology is high, and the production efficiency is low, so it is not suitable for mass production fixtures.

Method used

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  • Expanding type mandrel clamp
  • Expanding type mandrel clamp
  • Expanding type mandrel clamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] figure 1 Shown is an expansion-tight mandrel fixture for gear hobbing and the axial dimension of the inner hole of the workpiece 2 is relatively long. Fitting nut 4. Cage 6 is cylindrical fence-shaped, and its inner hole fits with the middle section of mandrel 1 in clearance, and the outer wall diameter is 10mm smaller than the matching workpiece 2 inner hole diameter, and the length is 5mm shorter. The cage 6 is provided with 6 fence bars, and 6 cylindrical rubber elastic parts 5 are placed between the fence bars. Both ends of the elastic parts 5 are chamfered and stop at the axial inner end surface of the cage 6. The inside leans against the outer wall of the mandrel 1, and the outside is in transition fit with the inner hole of the workpiece 2. A group of elastic members 5 with the same structure, size and material produce an equal amount of elastic deformation when the workpiece 2 is set, so that the workpiece 2 is automatically positioned based on the mandrel 1,...

Embodiment 2

[0020] image 3 Shown is an expansion-tight mandrel fixture for gear hobbing and with a short axial dimension of the workpiece 2. The cage 6 in the fixture is short in length, and the elastic member 5 is a steel ball. The other structures are similar to Example 1 is the same. The precision of the gears processed in this embodiment is also stable above grade 8.

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Abstract

The invention discloses an expanding type mandrel clamp which comprises a holding frame sleeved with a mandrel, a flat washer and a nut matched with the flat washer, wherein the holding frame is in a cylindrical fence shape; an inner wall is in clearance fit with the mandrel; the diameter of an outer wall is smaller than the diameter of an inner hole of a matched workpiece; elastic pieces are arranged among fence bars of the holding frame; two ends of each elastic piece are positioned on an inner end surface in the axial direction of the holding frame; and the inside of each elastic piece is in contact with the outer wall of the mandrel, and the outside of each elastic piece is in transition fit with the inner hole of the workpiece. The elastic pieces which are uniformly distributed between the mandrel and the workpiece are used for generating elastic deformation to realize the purpose of centering. The expanding type mandrel clamp of the invention has simple structure, easy manufacture and convenient clamping and is especially suitable for mass production.

Description

technical field [0001] The invention relates to a mandrel-type mechanical cutting fixture, in particular to an expansion-tight mandrel fixture for gear hobbing. [0002] Background technique [0003] In the machinery manufacturing industry, the inner hole of the workpiece is often used as the positioning reference for mechanical cutting. This type of mechanical cutting must use mandrel fixtures. The fit between the workpiece and the mandrel is a gap fit, and the size of the gap value directly affects the machining accuracy of the machining. If the fit gap is small, the precision of the processed workpiece is high, and vice versa. Chinese patent 20061020193 discloses a mandrel tool for processing disc gears. The technical scheme adopts the matching structure of conical needle rollers uniformly distributed and inverted on the outer circumference of the conical mandrel and the inner hole of the workpiece. The gap between the mandrel and the workpiece is solved, and the precisi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23F23/02B23B31/40
Inventor 葛晓明周智慧陆小兵
Owner JIANGSU AIRSHIP GEAR