Positioning and limiting tool for lathe

Abstract

A positioning and limiting tool for a lathe comprises a positioning piece and a limiting piece, the positioning piece comprises a positioning piece base and a positioning piece barrel which are integrally formed, the inner edge of the upper end face of the positioning piece barrel is a first oblique tangent plane, a second oblique tangent plane is arranged in the positioning piece barrel, and a stepped positioning face is arranged below the second oblique tangent plane; the limiting piece is consistent with the positioning piece in external structure and comprises a limiting piece base and a limiting piece barrel, and a conical limiting face is arranged at the bottom in the limiting piece barrel.

Description

TECHNICAL FIELD

[0001] The utility model discloses lathe mould related technical field, specifically point to a lathe with fixed position frock. BACKGROUND

[0002] At present, the concentricity requirement of shaft is very high in the finishing of shaft parts. The traditional method is one clamping and one top, two top clamping, which needs to first punch a center hole, plane end face, and then process, increasing the process, and the radial runout of the part exists in the processing process, and there is a large probability of exceeding the tolerance. Some shaft products do not need to punch a center hole, in order to ensure the concentricity, the length of the shaft is extended to punch a center hole, and the center hole part is removed after all process sizes are finished, which is quite cumbersome.

[0003] The patent application CN101518875A discloses a lathe precision positioning clamping device, which comprises a clamp base, a clamp body, an elastic sleeve and a fastening nut. The clamp body is connected and fixed with the clamp base through a screw, the fastening nut is bolted with the clamp body, and the upper end of the elastic sleeve is connected and fixed with the fastening nut. The elastic sleeve is uniformly distributed with a plurality of slits at both ends, the number of which is a multiple of 3, and the distance between any two slits is equal. The workpiece is placed in the elastic sleeve, and the axial position is limited by the positioning block. The outer conical surface of the elastic sleeve is matched with the corresponding conical surface on the clamp body to center, and rotating the fastening nut drives the elastic sleeve to produce axial displacement, so as to change the inner diameter of the sleeve, and then clamp the workpiece. The invention can change the inner diameter according to the needs of the part family, so that it can be applied to parts of various sizes. The design avoids the increase of process and tooling repeated design work in the mechanical processing process, thereby saving time and cost. However, the design uses the cooperation of nut and bolt, the structure is relatively complex, the process is slightly complex, and the use is not convenient. SUMMARY

[0004] The utility model discloses lathe with fixed position frock is to overcome the shortcoming and the insufficient of prior art, provide a kind of structure simple, convenient to use, can reduce processing procedure and can realize the lathe with fixed position frock of stable fixation, limiting.

[0005] To achieve the above object, the technical solution of the utility model is: a lathe with fixed position frock, including positioning piece and limiting piece, the positioning piece includes integrally-formed positioning piece base and positioning piece cylinder, the upper end surface inner edge of the positioning piece cylinder is a No.1 oblique surface, there is No.2 oblique surface in the positioning piece cylinder, and a stepped positioning surface is arranged below No.2 oblique surface;The external structure of the limiting piece is consistent with the positioning piece, including limiting piece base and limiting piece cylinder, and a conical limiting surface is formed in the bottom of the limiting piece cylinder.

[0006] The inner wall of the positioning member cylinder is provided with an annular gas elimination groove, and the gas elimination groove and the positioning surface are in the same horizontal plane.

[0007] The inner wall of the limiting member cylinder is provided with an annular gas elimination groove, and the gas elimination groove and the opening of the conical limiting surface are in the same plane.

[0008] The positioning surface of the positioning member cylinder is provided with a conical cavity below.

[0009] Compared with the prior art, the positioning member and the limiting member are respectively installed in the main shafts of two lathe machines, one of the lathe machines can be selected to perform rough turning on the small head of the blank, after the rough turning, the small head of the blank is installed in the limiting member, the conical limiting surface is used to limit the rough-turned small head, so that the large head is precisely turned, the precisely-turned large head is installed in the positioning member, the positioning surface is used to position the large head, so that the small head is precisely turned, the process is simplified (only three processes), and the cost is saved.

[0010] The design is used, the positioning member and the limiting member are respectively installed in the main shafts of two lathe machines, one of the lathe machines can be selected to perform rough turning on the small head of the blank, after the rough turning, the small head of the blank is installed in the limiting member, the conical limiting surface is used to limit the rough-turned small head, so that the large head is precisely turned, the precisely-turned large head is installed in the positioning member, the positioning surface is used to position the large head, so that the small head is precisely turned, the process is simplified (only three processes), and the cost is saved.

[0011] 2, the inner edge of the upper end surface of the positioning member cylinder is a first inclined surface, which cooperates with a second inclined surface in the positioning member cylinder to facilitate the blank to enter the cylinder and abut against the positioning surface.

[0012] In the design, the inner wall of the cylinder on the same horizontal plane of the positioning surface is provided with an annular gas elimination groove, and the burr on the blank end surface cannot abut against the positioning slope surface, so that the process is reduced.

[0013] In the design, the limiting member cylinder is provided with a conical limiting surface at the bottom, which is used to limit the small head of the rough-turned blank, because of rough turning, the sizes of the small heads are different, and the conical surface can effectively fix the small heads and prevent radial jumping of the small heads from causing over-difference. DRAWINGS

[0014] Figure 1 is a perspective view of the positioning member in the utility model;

[0015] Figure 2 is a perspective view of the limiting member in the utility model;

[0016] Figure 3 is a front view of the positioning member (the limiting member) in the utility model;

[0017] Figure 4 is Figure 3 the positioning member A-A sectional view;

[0018] Figure 5 is Figure 3 the limiting member A-A sectional view.

[0019] In the figure: positioning member 1, positioning member base 11, positioning member cylinder 12, first inclined surface 13, second inclined surface 14, positioning surface 15, limiting member 2, limiting member base 21, limiting member cylinder 22, conical limiting surface 23, gas elimination groove 3, conical cavity 4.

[0020] surface 14, positioning surface 15, limiting member 2, limiting member base 21, limiting member cylinder 22, conical limiting surface 23, gas elimination groove 3, conical cavity 4. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail in combination with the description and specific implementation of the accompanying drawings.

[0022] Referring to Figures 1 to 5 A positioning and limiting tool for a lathe, characterized in that it comprises a positioning member 1 and a limiting member 2, the positioning member 1 comprises an integrally formed positioning member base 11 and a positioning member cylinder 12, the inner edge of the upper end surface of the positioning member cylinder 12 is a first inclined surface 13, the positioning member cylinder 12 has a second inclined surface 14 therein, and a stepped positioning surface 15 is arranged below the second inclined surface 14; the limiting member 2 is identical in external structure to the positioning member 1 and comprises a limiting member base 21 and a limiting member cylinder 22, and a conical limiting surface 23 is arranged in the bottom of the limiting member cylinder 22.

[0023] An annular gas elimination groove 3 is arranged on the inner wall of the positioning member cylinder 12, and the gas elimination groove 3 is in the same horizontal plane as the positioning surface 15. An annular gas elimination groove 3 is arranged on the inner wall of the limiting member cylinder 22, and the opening of the gas elimination groove 3 is in the same plane as the conical limiting surface 23. A conical cavity 4 is arranged below the positioning surface 15 of the positioning member cylinder 12.

[0024] In finish machining, the concentricity of the shaft is required to be within 3 wires, and the traditional method is to clamp and top one by one, that is, to clamp and top two, so that the center hole, flat end surface and machining are required to be performed in sequence, thereby increasing the process (the shaft may be out of tolerance), and the finished product of some shafts does not need to be punched with a center hole. In order to ensure the concentricity, the length of the shaft is lengthened to punch the center hole. After all process dimensions are machined, the center hole part is removed, and the process includes punching a short center hole, rough turning an outer circle, flattening a small head end surface, limiting an outer circle, finish turning a large head, and finish turning a small head outer circle, and the process is very complicated.

[0025] After the design is used, the positioning and limiting tool in the lathe spindle cooperates with the three claws to improve the concentricity of the shaft, reduces the process (the center hole and the outer circle are machined together during finish turning, and the center hole is not required to be clamped and punched additionally), improves the production efficiency, and saves the cost.

[0026] After the positioning and limiting tool of the design is used, the process is reduced to three steps.

[0027] 1) flat end face rough turning outer circle: the big head of the blank is tightly abutted on the positioning face 15, the three-jaw clamps the outer circle of the blank, the small head end face is roughly turned, since the positioning face 15 is on the same plane with the annular gas removal groove 3 on the inner wall of the cylinder, the burr on the end face of the blank cannot abut on the positioning face 15, and the total length of the shaft after flat small head end face is unchanged;

[0028] 2) fine turning of the big head: the small head of the blank after rough turning is tightly abutted on the tapered limiting face 23, since the size of the small head after rough turning is different, when clamping, the small head end face needs to be tightly abutted on the tapered limiting face, so as to avoid radial runout to cause out-of-tolerance, the three-jaw clamps the outer circle, the big head is fine turned with the flat end face, and the center hole is punched;

[0029] 3) fine turning of the small head: the big head of the blank is tightly abutted on the positioning face 15, the three-jaw clamps the outer circle and the flat small head end face, the small head is fine turned and the center hole is punched.

[0030] In the positioning piece of the design, the inner edge of the upper end face of the positioning piece cylinder 12 is a first inclined surface 13, which cooperates with the second inclined surface 14 in the positioning piece cylinder 12, so as to facilitate the blank to enter the cylinder and abut on the positioning face 15; the tapered cavity 4 below the positioning face 15 is a space reserved for turning the positioning face 15.

[0031] The outer circle and the positioning face 15 in the positioning piece 1 of the positioning tool are turned once (the outer circle and the tapered limiting face 23 in the limiting piece 2 are also turned once), which can effectively ensure the concentricity of the outer circle and the hole, improve the concentricity of the shaft when used with the three-jaw, reduce the process, improve the production efficiency, and effectively save the cost.

[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fixture for setting a limit position for a lathe, characterized by: Including positioning piece (1) and limiting piece (2), the positioning piece (1) includes integrated positioning piece base (11) and positioning piece cylinder (12), the inner edge of the upper end surface of the positioning piece cylinder (12) is a number one oblique cutting surface (13), the positioning piece cylinder (12) has a number two oblique cutting surface (14) inside, a stepped positioning surface (15) is arranged below the number two oblique cutting surface (14);The limiting piece (2) is consistent with the external structure of the positioning piece (1), including limiting piece base (21) and limiting piece cylinder (22), the bottom of the limiting piece cylinder (22) is provided with a tapered limiting surface (23).

2. The tooling for centering and positioning workpieces on a lathe of claim 1, wherein: The inner wall of the positioning piece cylinder (12) is provided with an annular gas removal groove (3), and the gas removal groove (3) is on the same horizontal plane as the positioning surface (15).

3. The tooling fixture of claim 1, wherein: The inner wall of the limiting piece cylinder (22) is provided with an annular gas removal groove (3), and the opening of the gas removal groove (3) is on the same plane as the tapered limiting surface (23).

4. The tooling fixture of claim 1, wherein: The positioning surface (15) of the positioning piece cylinder (12) is provided with a tapered cavity (4) below.

Images