Machining clamp for long inner hole shaft

Abstract

The utility model relates to the technical field of numerical control machining, in particular to a machining clamp for a long inner hole shaft, which comprises a pull rod and a main shaft flange, a clamp base shaft is arranged at one end of the main shaft flange, a mounting base is arranged at one end of the clamp base shaft, and a positioning head mounting part is arranged at the other end of the clamp base shaft. An expansion sleeve supporting part and a long kidney-shaped round hole are formed in the middle of the clamp base shaft, a guide positioning head is arranged on the positioning head mounting part, an elastic expansion sleeve is arranged outside the expansion sleeve supporting part in a sleeving mode, a first pin shaft hole is formed in one end of the elastic expansion sleeve, a second pin shaft hole penetrating in the radial direction is formed in one end of the pull rod, and a second pin shaft hole penetrating in the radial direction is formed in the other end of the pull rod. An elastic cylindrical pin is arranged in the first pin shaft hole, the second pin shaft hole and the long kidney-shaped round hole in a penetrating mode. According to the utility model, the turning tool can conveniently finish the turning operation of the outer surface of the long inner hole shaft at one time, the machining precision and efficiency are improved, the potential safety hazard is avoided, and the use is convenient and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machining, in particular to a machining fixture for a long inner hole shaft. Background Art

[0002] A numerical control lathe is a high-precision and high-efficiency automatic machining machine tool, and a hydraulic chuck system is arranged inside it. The hydraulic chuck system usually includes a rotary cylinder, a spindle box, a pull rod, a hydraulic chuck, etc. The rotary cylinder drives the wedge block inside the hydraulic chuck to move through the pull rod, so as to realize the clamping and loosening of the clamping jaws of the hydraulic chuck, which is convenient for the turning machining of bar materials. However, for the machining of a long inner hole shaft, this end clamping method will cause the deflection of the long inner hole shaft, which will further affect the machining accuracy and efficiency, and there are potential safety hazards. Further, if the outer circle clamping method is adopted, it needs two clampings to separately complete the turning machining of the outer surface of the long inner hole shaft, which will also affect the machining accuracy and efficiency, reduce the market competitiveness, and is not conducive to the development of the enterprise. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the problems existing in the above background art, and provide a machining fixture for a long inner hole shaft. According to the structural characteristics of the long inner hole shaft, it is clamped in the middle of its inner hole through the action of the elastic expansion sleeve, and is supported and positioned at the top of its inner hole through the guiding positioning head. It clamps the long inner hole shaft in an automatic centering manner, improves the clamping accuracy and efficiency, and is clamped in the middle of the long inner hole shaft, improves the clamping reliability, and thus eliminates potential safety hazards.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a machining fixture for a long inner hole shaft, which includes a pull rod and a spindle flange. The spindle flange is connected to the spindle of the lathe. The pull rod passes through the spindle flange. One end of the spindle flange is provided with a fixture base shaft. One end of the fixture base shaft is provided with an installation base. The other end of the fixture base shaft is provided with a positioning head installation part. The middle part of the fixture base shaft is provided with an expansion sleeve support part and a radially penetrating long waist-shaped hole, and the expansion sleeve support part is close to the side of the positioning head installation part, and the long waist-shaped hole is close to the side of the installation base. A pull rod moving hole is arranged inside the fixture base shaft, and the pull rod moving hole is communicated with the long waist-shaped hole;

[0005] A guiding positioning head is arranged on the positioning head installation part. An elastic expansion sleeve is sleeved outside the expansion sleeve support part. One end of the elastic expansion sleeve is provided with a radially penetrating first pin hole. One end of the pull rod is provided with a radially penetrating second pin hole. The diameters of the second pin hole and the first pin hole are the same. An elastic cylindrical pin is penetrated through the first pin hole, the second pin hole and the long waist-shaped hole.

[0006] Further, a positioning groove is provided at one end of the spindle flange, and the mounting base is adaptively installed in the positioning groove. The positioning groove plays a positioning role to ensure that the fixture base shaft and the spindle flange are coaxially arranged.

[0007] Further, the positioning head mounting portion is arranged in a conical shape, and a positioning groove adapted to the taper of the positioning head mounting portion is provided inside the guiding positioning head to ensure that the guiding positioning head and the fixture base shaft are coaxially arranged.

[0008] Further, an arc angle is provided at the top end of the guiding positioning head, and the arc angle is adapted to the R angle inside the long inner hole shaft, which can preferably play a guiding and positioning role.

[0009] Further, a conical tightening portion is provided inside the elastic expansion sleeve, and the expansion sleeve support portion is adapted to the tightening portion. By the pulling action of the pull rod, the elastic expansion sleeve is driven to slide up and down on the outer surface of the expansion sleeve support portion, so as to clamp or loosen the long inner hole shaft to be machined.

[0010] Further, a plurality of axial opening grooves are provided at one end of the elastic expansion sleeve away from the first pin hole, which is convenient for the elastic expansion sleeve to expand outwards.

[0011] Further, a set screw mounting hole is provided on the end face of the elastic expansion sleeve where the first pin hole is provided, and a set screw is installed in the set screw mounting hole to fasten the elastic cylindrical pin, which can better avoid the loosening and falling off of the elastic cylindrical pin.

[0012] The beneficial effects of the present utility model are as follows: (1) According to the structural characteristics of the long inner hole shaft, it is clamped in the middle of its inner hole through the action of the elastic expansion sleeve, and supported and positioned at the top of its inner hole through the guiding positioning head. It clamps the long inner hole shaft by means of automatic alignment, improves the clamping accuracy and efficiency, and clamps at the middle of the long inner hole shaft, improving the clamping reliability, thus eliminating potential safety hazards; (2) Since the inside of the long inner hole shaft is clamped, only one clamping is required to complete the turning processing of the outer surface of the long inner hole shaft, which further improves the processing accuracy and processing efficiency and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present utility model will be further described below with reference to the drawings and embodiments.

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0015] Figure 2This is a sectional view of the present utility model;

[0016] Figure 3 This is a schematic structural view of the fixture base shaft in the present utility model;

[0017] Figure 4 This is a schematic structural view of the present utility model in the working state;

[0018] In the figure: 01, pull rod; 02, spindle flange; 03, fixture base shaft; 04, mounting base; 05, positioning head mounting part; 06, expansion sleeve support part; 07, long waist-shaped circular hole; 08, pull rod moving hole; 09, guiding positioning head; 10, elastic expansion sleeve; 11, first pin hole; 12, second pin hole; 13, elastic cylindrical pin; 14, positioning groove; 15, arc angle; 16, long inner hole shaft; 17, opening groove; 18, set screw mounting hole. Detailed implementation manners

[0019] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0020] As Figures 1 to 3 shown, a processing fixture for a long inner hole shaft includes a pull rod 01 and a spindle flange 02. The spindle flange 02 is connected to the spindle of a lathe. The pull rod 01 passes through the spindle flange 02. One end of the spindle flange 02 is provided with a fixture base shaft 03. One end of the fixture base shaft 03 is provided with a mounting base 04. The other end of the fixture base shaft 03 is provided with a positioning head mounting part 05. The middle part of the fixture base shaft 03 is provided with an expansion sleeve support part 06 and a radially penetrating long waist-shaped circular hole 07. And the expansion sleeve support part 06 is on the side close to the positioning head mounting part 05, and the long waist-shaped circular hole 07 is on the side close to the mounting base 04. The inside of the fixture base shaft 03 is provided with a pull rod moving hole 08, and the pull rod moving hole 08 communicates with the long waist-shaped circular hole 07.

[0021] The positioning head mounting part 05 is provided with a guiding positioning head 09. An elastic expansion sleeve 10 is sleeved outside the expansion sleeve support part 06. One end of the elastic expansion sleeve 10 is provided with a radially penetrating first pin hole 11. One end of the pull rod 01 is provided with a radially penetrating second pin hole 12. The diameter of the second pin hole 12 is the same as that of the first pin hole 11. An elastic cylindrical pin 13 penetrates through the first pin hole 11, the second pin hole 12 and the long waist-shaped circular hole 07.

[0022] One end of the spindle flange 02 is provided with a positioning groove 14, and the mounting base 04 is adaptively mounted in the positioning groove 14. The positioning groove 14 plays a positioning role to ensure that the fixture base shaft 03 and the spindle flange 02 are coaxially arranged.

[0023] The positioning head mounting portion 05 is arranged in a conical shape, and a positioning groove adapted to the taper of the positioning head mounting portion 05 is provided inside the guiding positioning head 09 to ensure that the guiding positioning head 09 and the fixture base shaft 03 are coaxially arranged. An arc angle 15 is provided at the top end of the guiding positioning head 09, and the arc angle 15 is adapted to the R angle inside the long inner hole shaft 16, which can play a better guiding and positioning role.

[0024] A conical expansion portion is provided inside the elastic expansion sleeve 10, and the expansion sleeve support portion 06 is adapted to the expansion portion. Through the pulling action of the pull rod 01, the elastic expansion sleeve 10 is driven to slide up and down on the outer surface of the expansion sleeve support portion 06, so as to clamp or loosen the long inner hole shaft 16 to be machined. Multiple axial opening grooves 17 are provided at one end of the elastic expansion sleeve 10 away from the first pin hole 11, which is convenient for the elastic expansion sleeve 10 to expand outward to clamp the long inner hole shaft 16.

[0025] As Figure 2 shown, a set screw mounting hole 18 is provided at the end face of the lower end of the elastic expansion sleeve 10, and a set screw is installed in the set screw mounting hole 18 to fasten the elastic cylindrical pin 13, which can better avoid the loosening and falling off of the elastic cylindrical pin 13.

[0026] As Figure 2 and Figure 4 shown, during use, the long inner hole shaft 16 is sleeved outside the machining fixture. At this time, the top end inside the long inner hole shaft 16 abuts against the guiding positioning head 09; the rotary oil cylinder of the CNC lathe is started, and the pull rod 01 acts. It drives the elastic expansion sleeve 10 to move downward through the elastic cylindrical pin 13. The upper end of the elastic expansion sleeve 10 expands outward under the action of the expansion sleeve support portion 06 and abuts against the inner hole wall of the long inner hole shaft 16, realizing the clamping of the long inner hole shaft 16. At this time, the guiding positioning head 09 positions and supports the top end of the long inner hole shaft 16, and the elastic expansion sleeve 10 clamps and supports the middle part of the long inner hole shaft 16, that is, the clamping of the long inner hole shaft 16 is completed, which is convenient for the turning tool to complete the turning processing operation on the outer surface of the long inner hole shaft 16 at one time. It improves the machining accuracy and efficiency, avoids potential safety hazards, and is convenient and reliable to use.

[0027] Inspired by the above-described ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A machining fixture for a long inner hole shaft, which comprises a pull rod and a spindle flange, the pull rod passes through the spindle flange, and is characterized in that, One end of the spindle flange is provided with a fixture base shaft. One end of the fixture base shaft is provided with a mounting base. The other end of the fixture base shaft is provided with a positioning head mounting portion. The middle part of the fixture base shaft is provided with a shrink disc support portion and a long oval hole penetrating radially. And the shrink disc support portion is on the side close to the positioning head mounting portion, and the long oval hole is on the side close to the mounting base. A pull rod moving hole is arranged inside the fixture base shaft, and the pull rod moving hole communicates with the long oval hole; A guiding positioning head is arranged on the positioning head mounting portion. An elastic shrink disc is sleeved outside the shrink disc support portion. One end of the elastic shrink disc is provided with a first pin shaft hole penetrating radially. One end of the pull rod is provided with a second pin shaft hole penetrating radially. The diameters of the second pin shaft hole and the first pin shaft hole are the same. An elastic cylindrical pin penetrates through the first pin shaft hole, the second pin shaft hole and the long oval hole.

2. The machining fixture for a long inner hole shaft according to claim 1, wherein One end of the spindle flange is provided with a positioning groove, and the mounting base is adaptively mounted in the positioning groove.

3. The machining fixture for a long internal hole shaft according to claim 1, characterized in that, The positioning head mounting portion is arranged in a conical shape, and a positioning groove adapted to the taper of the positioning head mounting portion is arranged inside the guiding positioning head.

4. The machining fixture for a long internal hole shaft according to claim 1 or 3, characterized in that, The top end of the guiding positioning head is provided with an arc angle.

5. The machining fixture for a long internal hole shaft according to claim 1, characterized in that A conical tightening portion is arranged inside the elastic shrink disc, and the shrink disc support portion is adapted to the tightening portion.

6. The machining fixture for a long inner hole shaft according to claim 1 or 5, characterized in that, Multiple axial opening grooves are arranged at one end of the elastic shrink disc away from the first pin shaft hole.

7. The machining fixture for a long internal hole shaft according to claim 1, characterized in that, A set screw mounting hole is arranged on the end face of the elastic shrink disc provided with the first pin shaft hole.

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