Outer circle finish turning tool for machining high-hardness thin-wall cylindrical part

Abstract

The utility model relates to a finish turning excircle tooling for processing high hardness thin wall cylindrical part, including support shaft sleeve, expansion sleeve, support piece, wedge block, pull rod, pressure plate, bolt and thin wall cylindrical part, the expansion sleeve is provided in the thin wall cylindrical part, the outer ring surface of expansion sleeve is matched with thin wall cylindrical part inner surface, the support shaft sleeve extends into the expansion sleeve, the support piece is provided with the wedge block, the pull rod is provided with the pressure plate, the bolt is provided with the pressure plate. Wedge blocks and a supporting piece are arranged between the expansion sleeve and the supporting shaft sleeve, the two wedge blocks are symmetrically arranged on the supporting shaft sleeve in a sleeving mode, the supporting piece is arranged between the two wedge blocks in a clamping mode, one wedge block is limited through a shaft ring of the supporting shaft sleeve, the other wedge block is limited through a pressing plate, the pressing plate is connected with a pull rod through a bolt, and the pull rod is arranged in the supporting shaft sleeve. The wedge block and the expansion sleeve are in wedge-shaped connection, and the wedge block and the supporting piece are in wedge-shaped connection. The clamp is simple in structure, the whole expansion sleeve expands outwards, a machined workpiece is evenly stressed, the clamping effect of the clamp is enhanced, and the machining precision is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a finishing tool for machining external circles of high-hardness thin-walled cylindrical parts. Background Art

[0002] In the field of mechanical manufacturing, turning of thin-walled cylindrical parts with high hardness (50-55HRC) has always been difficult. Due to the thin wall of the parts (the minimum wall thickness is about 1-2mm, and the wall thickness tolerance is 0.1mm), the rigidity is insufficient, and they are easy to vibrate like spring leaves when squeezed by the cutting tool, causing resonance, resulting in reduced cutting surface quality and deformation of the workpiece. In general processing, hard support methods are generally used to increase the rigidity of the workpiece, and a hard mandrel matching the part is tightly inserted into the tubular workpiece to ensure that the part is protected from opening and resonance caused during processing. This method has the following disadvantages:

[0003] 1. It is necessary to equip each part with a corresponding hard mandrel, which is costly;

[0004] 2. Because it is a hard material, it is impossible to achieve tight fit with the parts. At the same time, due to the poor shock absorption ability of hard materials, the shock-proof support effect is limited. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a finishing tool for machining the outer circle of high-hardness thin-walled cylindrical parts, which solves the problem that it is difficult to finish the outer circle of high-hardness thin-walled cylindrical parts, and also solves the problems of large machining deformation, difficult chip removal, poor surface quality, difficult roundness assurance, and easy chip breakage and wear of intermittent cutting tools during the finishing process of high-hardness thin-walled cylindrical parts, thereby improving the quality and efficiency of finishing; it also solves the problem of troublesome assembly, disassembly and adjustment of tooling, and improves the clamping efficiency.

[0006] The purpose of the utility model is achieved in this way:

[0007] A finishing tool for machining high-hardness thin-walled cylindrical parts, comprising a support sleeve, an expansion sleeve, a support sheet, a wedge block, a pull rod, a pressure plate, bolts and a thin-walled cylindrical part, wherein an expansion sleeve is provided in the thin-walled cylindrical part, and the outer annular surface of the expansion sleeve cooperates with the inner surface of the thin-walled cylindrical part, the support sleeve extends into the expansion sleeve, a wedge block and a support sheet are provided between the expansion sleeve and the support sleeve, two wedge blocks are symmetrically sleeved on the support sleeve, a support sheet is sandwiched between the two wedge blocks, one wedge block is limited by the shaft ring of the support sleeve, and the other wedge block is limited by the pressure plate, the pressure plate is connected to the pull rod by bolts, the pull rod is arranged in the support sleeve, and wedge connections are adopted between the wedge block and the expansion sleeve, and between the wedge block and the support sheet.

[0008] Preferably, a plurality of identical support sheets form a circular expansion sleeve.

[0009] Preferably, the expansion sleeve is made of rubber.

[0010] Preferably, the wedge block is provided with a first outer conical surface and a second outer conical surface, the support sheet is provided with a first inner conical surface corresponding to the first outer conical surface, and the expansion sleeve is provided with a second inner conical surface corresponding to the second outer conical surface.

[0011] Preferably, the two second inner conical surfaces are symmetrically arranged at the two ends of the expansion sleeve, the two second inner conical surfaces are connected by an inner straight surface, and the outer annular surface of the support sheet matches with the inner straight surface of the expansion sleeve.

[0012] Preferably, the collar of the support sleeve divides the support sleeve into an inner mounting portion and an outer clamping portion, the inner mounting portion extends into the thin-walled cylindrical member, and the outer clamping portion is used to clamp a three-jaw chuck.

[0013] The beneficial effects of the utility model are:

[0014] The structure is simple and easy to install. Wedge-shaped connections are used between the wedge block and the expansion sleeve, and between the wedge block and the support block, so that the expansion sleeve expands outward as a whole, so that the workpiece being processed is evenly stressed, the clamping effect of the fixture is enhanced, and the processing accuracy is greatly improved; the expansion sleeve is made of rubber material, which provides flexible support for thin-walled cylindrical parts and has a good shock absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Among them: supporting sleeve 1; shaft ring 1.1; expansion sleeve 2; supporting sheet 3; wedge block 4; pull rod 5; pressure plate 6; bolt 7; thin-walled cylindrical part 8. DETAILED DESCRIPTION

[0017] See also Figure 1 The utility model relates to a finishing tool for machining high-hardness thin-walled cylindrical parts, comprising a supporting sleeve 1, an expansion sleeve 2, a support sheet 3, a wedge 4, a pull rod 5, a pressure plate 6, a bolt 7 and a thin-walled cylindrical part 8. The thin-walled cylindrical part 8 is provided with an expansion sleeve 2, and the outer ring surface of the expansion sleeve 2 cooperates with the inner surface of the thin-walled cylindrical part. The supporting sleeve 1 extends into the expansion sleeve 2, and a wedge 4 and a support sheet 3 are provided between the expansion sleeve 2 and the supporting sleeve 1. Two wedges 4 are symmetrically sleeved on the supporting sleeve 1, and a support sheet 3 is sandwiched between the two wedges 4. A plurality of identical support sheets 3 form a circular expansion sleeve, one wedge 4 is limited by the shaft ring 1.1 of the supporting sleeve 1, and the other wedge 4 is limited by the pressure plate 6. The pressure plate 6 is connected with the pull rod 5 by bolts 7, and the pull rod 5 is provided with threaded holes corresponding to the bolts 7. The pull rod 5 is axially arranged in the supporting sleeve 2, and wedge connections are adopted between the wedge 4 and the expansion sleeve 2, and between the wedge 4 and the support sheet 3.

[0018] The expansion sleeve 2 is made of rubber.

[0019] The wedge block 4 is provided with a first outer cone surface and a second outer cone surface, the support sheet 3 is provided with a first inner cone surface corresponding to the first outer cone surface, and the expansion sleeve 2 is provided with a second inner cone surface corresponding to the second outer cone surface.

[0020] The two second inner conical surfaces are symmetrically arranged at the two ends of the expansion sleeve 2, the two second inner conical surfaces are connected by an inner straight surface, and the outer annular surface of the support sheet matches with the inner straight surface of the expansion sleeve.

[0021] The collar 1.1 of the support sleeve 1 divides the support sleeve into an inner mounting portion and an outer clamping portion, wherein the inner mounting portion extends into the thin-walled cylindrical part, and the outer clamping portion is used for clamping a three-jaw chuck.

[0022] During installation, the expansion sleeve 2 is sleeved on the support sleeve 1, and the support plate 3 and the wedge block 4 are installed between the expansion sleeve 2 and the support sleeve 1. One of the wedge blocks 4 is limited by the shaft ring 1.1 of the support sleeve 1, and the other wedge block 4 is limited by the pressure plate 6. The pressure plate 6 and the pull rod 5 are connected with bolts 7 to ensure the parallelism, verticality and concentricity of the fine turning external cylindrical tooling and the high hardness thin-walled cylindrical parts. When the pull rod 5 is tightened, the wedge block 4 and the support plate 3 are squeezed through the pressure plate 6, and the expansion sleeve 2 completes the clamping of the workpiece under the action of the wedge block 4 and the support plate 3; the three-jaw chuck is clamped on the exposed outer clamping part of the support sleeve, and the chuck has a clamping force on the pull rod to ensure that the pull rod is in a tensioned state. Through clamping and calibration, the fine turning external cylindrical tooling and the high hardness thin-walled cylindrical parts are calibrated to achieve the best processing state, and then the fine turning external cylindrical process is carried out.

[0023] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A finishing tool for machining high-hardness thin-walled cylindrical parts, characterized in that: It includes a supporting sleeve, an expansion sleeve, a supporting sheet, a wedge block, a pull rod, a pressure plate, bolts and a thin-walled cylindrical part. An expansion sleeve is arranged in the thin-walled cylindrical part. The outer annular surface of the expansion sleeve cooperates with the inner surface of the thin-walled cylindrical part. The supporting sleeve extends into the expansion sleeve. A wedge block and a supporting sheet are arranged between the expansion sleeve and the supporting sleeve. Two wedge blocks are symmetrically arranged on the supporting sleeve. A supporting sheet is sandwiched between the two wedge blocks. One wedge block is limited by the shaft ring of the supporting sleeve, and the other wedge block is limited by the pressure plate. The pressure plate is connected to the pull rod by bolts. The pull rod is arranged in the supporting sleeve. Wedge-shaped connections are adopted between the wedge block and the expansion sleeve, and between the wedge block and the supporting sheet.

2. According to claim 1, a finishing tool for machining high-hardness thin-walled cylindrical parts, characterized in that: A plurality of identical support sheets form a circular expansion sleeve.

3. According to claim 1, a finishing tool for machining high-hardness thin-walled cylindrical parts, characterized in that: The expansion sleeve is made of rubber.

4. The finishing tool for machining high-hardness thin-walled cylindrical parts according to claim 1, characterized in that: The wedge block is provided with a first outer conical surface and a second outer conical surface, the support sheet is provided with a first inner conical surface corresponding to the first outer conical surface, and the expansion sleeve is provided with a second inner conical surface corresponding to the second outer conical surface.

5. The finishing tool for machining high-hardness thin-walled cylindrical parts according to claim 4, characterized in that: The two second inner conical surfaces are symmetrically arranged at the two ends of the expansion sleeve, the two second inner conical surfaces are connected by an inner straight surface, and the outer annular surface of the support sheet matches with the inner straight surface of the expansion sleeve.

6. The finishing tool for machining high-hardness thin-walled cylindrical parts according to claim 1, characterized in that: The shaft ring of the supporting shaft sleeve divides the supporting shaft sleeve into an inner mounting portion and an outer clamping portion, wherein the inner mounting portion extends into the thin-walled cylindrical part, and the outer clamping portion is used for clamping a three-jaw chuck.

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