Clamping fixture for bullet-shaped gauge

Abstract

The utility model discloses a clamping fixture for an elastic gauge, which comprises a fixture body, the fixture body is provided with a major arc-shaped clamping end, the diameter of the clamping end corresponds to the diameter of a cylindrical part at the rear end of the elastic gauge, and two ends of the clamping end are symmetrically connected with support lugs. An acute included angle is formed between the plane where the supporting lugs are located and the plane where the clamping end is located, screw holes are formed in the ends of the supporting lugs, and the screw holes in the supporting lugs at the two ends of the clamping end are tensioned through compression screws so that the clamping end can be clamped and fixed to the outer circle of the cylindrical part at the rear end of the elastic gauge. According to the utility model, the processing difficulty of the bullet-shaped gauge is reduced, and the precision of the bullet-shaped gauge is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of firearms, in particular to a clamping fixture for a bullet-shaped gauge. Background Art

[0002] like Figure 1 The bullet gauge shown is in the shape of a bullet and is used to replace bullets of standard size and to detect whether the relevant dimensions of various firearms and equipment are qualified.

[0003] For similar bullet-shaped gauges during processing, such as Figure 2 The traditional heart-shaped clamp shown in the figure has problems such as difficult clamping, inaccurate positioning accuracy, and interference with the machine tool grinding wheel. It is proposed to cleverly solve the clamping problems of this type of elastic gauge by designing a simple clamping fixture and discussing the precautions for fixture manufacturing and tooling component shape processing, so that the workpiece clamping can be fast, simple, and high-quality.

[0004] Figure 1 This is a schematic diagram of a spring-shaped gauge. The front end of this type of spring-shaped gauge is an angle taper surface with precision requirements, the surface roughness is Ra0.2um, and there are intersection precision size requirements; the rear end is a cylinder, but the length is only 1.52mm. When the front taper surface is circularly ground, a heart clamp must be used to clamp the outer circle of the workpiece. The heart clamp is rotated by the chuck installed on the spindle. Since the heart clamp is tightly clamped on the workpiece, the workpiece can rotate with the chuck to achieve circular feed motion.

[0005] The traditional chicken heart chuck has the following defects:

[0006] When clamping a thin disc, the traditional heart-shaped chuck will interfere with the grinding wheel, and the thickness of the thin disc (the rear cylindrical part) is too small, the clamping is unstable, the operating safety is low, and safety accidents are very likely to occur, which brings difficulties to the circular grinding process.

[0007] 1. Since the outer circle measuring surface of the rear cylindrical part is too short, with a length of only 1.52mm, the clamping stability is poor.

[0008] 2. When machining the tapered surface, the degassing groove between the tapered surface and the outer circle of the rear cylindrical part is too small, causing interference between the grinding wheel and the heart clamp, resulting in low operating safety and a high risk of safety accidents.

[0009] 3. Excessive coaxiality: If the tapered surface is processed in sections, that is, a part of the front tapered surface is clamped with a heart-shaped clamp, and then rounded and transitioned into a whole. This processing method is complicated, the coaxiality cannot be guaranteed, and the processing efficiency is low.

[0010] Due to the above defects, the traditional heart-shaped clamp is difficult to use when processing such elastic gauges, and the precision of the currently processed elastic gauges is low. Summary of the invention

[0011] The utility model aims to overcome the deficiencies of the prior art, provide a clamping fixture for a spring-shaped gauge, reduce the processing difficulty of the spring-shaped gauge, and improve the accuracy of the spring-shaped gauge.

[0012] The purpose of the utility model is achieved in this way:

[0013] A clamping fixture for a spring-shaped gauge comprises a fixture body, the fixture body having a clamping end in a superior arc shape, the diameter of the clamping end corresponding to the diameter of the rear end cylindrical portion of the spring-shaped gauge, support ears symmetrically connected at both ends of the clamping end, the plane where the support ears are located forms an acute angle with the plane where the clamping end is located, screw holes are provided at the ends of the support ears, and the screw holes on the support ears at both ends of the clamping end are tightened by tightening screws so that the clamping end is clamped and fixed on the outer circle of the rear end cylindrical portion of the spring-shaped gauge.

[0014] Preferably, a step hole is provided on one side of the clamping end of the clamp body corresponding to the elastic gauge, the large diameter section of the step hole is used to cooperate with the rear end cylindrical portion of the elastic gauge, and the step surface of the step hole is used to contact and position with the end face of the rear end cylindrical portion of the elastic gauge.

[0015] Preferably, the depth of the large diameter section of the stepped hole is smaller than the axial length of the rear end cylindrical portion of the elastic gauge.

[0016] Preferably, the screw holes on the supporting ears at both ends of the clamping end are M4 screw holes.

[0017] Preferably, the plane where the support ear is located forms an angle of 30 degrees with the plane where the clamping end is located.

[0018] Preferably, the material of the clamp body is 45 steel with a quenched and tempered HRC35-40.

[0019] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0020] The utility model can greatly reduce the processing difficulty of the spring-shaped gauge, greatly improve the coaxiality of the spring-shaped gauge, and improve the production efficiency by more than 2 times, and is suitable for the manufacture of single-piece and small-batch gauges with similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 for Figure 1 A cross-sectional schematic diagram of

[0023] Figure 3 It is a schematic diagram of the use of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the bullet gauge;

[0025] Figure 5 It is a structural schematic diagram of the chicken heart clip.

[0026] Attached photos

[0027] In the attached drawings, 1 is the clamping end, 2 is the support ear, 3 is the step hole, and 4 is the rear end cylindrical portion of the bullet-shaped gauge. DETAILED DESCRIPTION

[0028] A clamping fixture for a spring-shaped gauge comprises a fixture body, the fixture body having a clamping end in a superior arc shape, the diameter of the clamping end corresponding to the diameter of the rear end cylindrical portion of the spring-shaped gauge, support ears symmetrically connected at both ends of the clamping end, the plane where the support ears are located forms an acute angle with the plane where the clamping end is located, screw holes are provided at the ends of the support ears, and the screw holes on the support ears at both ends of the clamping end are tightened by tightening screws so that the clamping end is clamped and fixed on the outer circle of the rear end cylindrical portion of the spring-shaped gauge.

[0029] A step hole is provided on one side of the clamping end of the clamp body corresponding to the elastic gauge, the large diameter section of the step hole is used to cooperate with the rear end cylindrical portion of the elastic gauge, and the step surface of the step hole is used to abut against the end surface of the rear end cylindrical portion of the elastic gauge for positioning. The depth of the large diameter section of the step hole is less than the axial length of the rear end cylindrical portion of the elastic gauge.

[0030] The utility model designs a novel spring-shaped gauge fixture according to the actual processing conditions of the spring-shaped gauge. In this embodiment:

[0031] 1. The fixture is made of 45 steel, quenched and tempered HRC35 ~40;

[0032] 2. The upper end of the fixture is a support ear, and the bottom is a clamping end. There is a 30-degree angle between the support ear and the bottom clamping end. There is an M4 screw hole on the support ear, which is connected to the clamping screw. The workpiece is fixed in the clamping position through the clamping screw.

[0033] Before the circular grinding and finishing of the taper surface, the utility model clamps the spring-shaped gauge, and rotates the support ear through the chuck installed on the machine tool spindle, driving the workpiece to rotate with the rotation of the chuck to achieve circular feed motion. The utility model can greatly reduce the processing difficulty of the spring-shaped gauge, greatly improve the coaxiality of the spring-shaped gauge, and improve the production efficiency by more than 2 times. It is suitable for the manufacture of single-piece and small-batch gauges with similar structures.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A clamping fixture for a spring gauge, characterized in that: The clamp body includes a clamp body having an arc-shaped clamping end, the diameter of the clamping end corresponds to the diameter of the rear end cylindrical portion of the elastic gauge, the two ends of the clamping end are symmetrically connected with support ears, the plane where the support ears are located forms an acute angle with the plane where the clamping end is located, and the ends of the support ears are provided with screw holes. The screw holes on the support ears at both ends of the clamping end are tightened by tightening screws to clamp the clamping end on the outer circle of the rear end cylindrical portion of the elastic gauge.

2. The clamping fixture for a spring gauge according to claim 1, characterized in that: A step hole is provided on one side of the clamping end of the fixture body corresponding to the elastic gauge. The large diameter section of the step hole is used to cooperate with the rear end cylindrical part of the elastic gauge, and the step surface of the step hole is used to contact and position with the end face of the rear end cylindrical part of the elastic gauge.

3. The clamping fixture for a spring-shaped gauge according to claim 2, characterized in that: The depth of the large diameter section of the stepped hole is less than the axial length of the rear end cylindrical portion of the bullet gauge.

4. The clamping fixture for a spring-shaped gauge according to claim 1 is characterized in that: The screw holes on the supporting ears at both ends of the clamping end are all M4 screw holes.

5. The clamping fixture for a spring-shaped gauge according to claim 1, characterized in that: The plane where the support ear is located forms an angle of 30 degrees with the plane where the clamping end is located.

6. The clamping fixture for a spring-shaped gauge according to claim 1, characterized in that: The fixture body is made of quenched and tempered HRC35-40 45 steel.

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