Expansion mandrel for processing and positioning thin-walled tube

Abstract

The utility model relates to an expansion mandrel for processing and positioning a thin-walled tube. The expansion mandrel comprises an expansion core and an adjusting stud, the expansion core is a pipe body, two symmetrical and parallel axial gaps are formed in one end of the pipe body, so that the end of the pipe body forms two parts based on the symmetrical gaps, each part is provided with a radial threaded hole, and the radial threaded holes of the two parts are coaxial; the two adjusting studs are matched with the two threaded holes correspondingly, and the inner ends of the two adjusting studs are in an abutting state. The end structures of the two opposite adjusting studs are different, one adjusting stud is concave inwards, the other adjusting stud is convex outwards, and the two adjusting studs are matched in shape; by rotating the two studs, the two parts at one end of the pipe body can deform oppositely or oppositely, so that the size of the outer contour of the expansion core is changed, and tensioning positioning in the thin-walled pipe is achieved. The quick positioning and locking process of the part is realized by utilizing the expansion principle. And deformation of parts is reduced in the machining process, and stability and reliability are achieved. And meanwhile, the small plane on the mandrel is used for alignment conveniently and quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to an expansion mandrel used for processing and positioning of thin-walled tubes. Background Art

[0002] Pure iron parts are widely used in the fields of electricity, electronics, aerospace, etc. due to their high purity, excellent electromagnetic properties and good processing performance. The material of a certain yoke part is DT4E. Although the material has good ductility and toughness, its strength and hardness are relatively low. It is easy to change during the processing, resulting in the inability to guarantee high-precision holes and outer circles. In addition, there are scratches on the surface of the parts after processing, resulting in unqualified surface roughness of the parts. The traditional clamping method uses a rigid mandrel for clamping. The positioning accuracy of the rigid mandrel and the part clearance is not high; the rigid mandrel has poor adaptability, and multiple mandrels are required for one part; some rigid mandrels slip; scratches are easily generated on the surface of the part, affecting delivery; the clamping process wastes a lot of time to test the adaptability of the mandrel. And the processing qualification rate is not high. Utility Model Content

[0003] Purpose of the utility model: To solve the problems of clamping, variability and scratches on the outer surface of pure iron rotating parts after processing.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] Provide an expansion mandrel for thin-walled tube processing and positioning, including an expansion core and an adjusting stud;

[0006] The expansion core is a tube body, and two symmetrical and parallel axial gaps are opened at one end of the tube body, so that one end of the tube body forms two parts based on the symmetrical gaps, each part has a radial threaded hole, and the radial threaded holes of the two parts are coaxial; there are two adjusting studs, which match the two threaded holes respectively, and the inner ends of the two adjusting studs are in a top-to-top state; the end structures of the two top-to-top adjusting studs are different, one is concave and the other is convex, and the shapes are adapted; rotating the two studs can make the two parts of one end of the tube body deform relative to or opposite to each other, thereby changing the outer contour size of the expansion core and realizing tensioning and positioning from the inside of the thin-walled tube.

[0007] Furthermore, the inner concave portion is an inner cone, and the outer convex portion is an outer cone.

[0008] Furthermore, the outer ends of the two adjusting studs are both external hexagonal structures.

[0009] Furthermore, the outer ends of the two adjusting studs are both hexagonal structures.

[0010] Furthermore, the end of the slit forms an arc.

[0011] Furthermore, the end of the expansion core forms a journal, and the journal is provided with the threaded hole.

[0012] Furthermore, the angle of the inner and outer cones is 120°. The larger contact surface increases the friction between the two, preventing the screws from loosening due to centrifugal force generated by high-speed rotation of the parts and vibration of the machine tool during processing.

[0013] Furthermore, a positioning plane is provided on the mandrel, and the plane is aligned for positioning before the mandrel is used each time.

[0014] Furthermore, a chip removal groove is provided on the outer circle of the core shaft to solve the problem of parts scratching during chip removal.

[0015] Beneficial effects of the utility model

[0016] The utility model uses the expansion principle to realize the rapid positioning and locking process of parts. The deformation of parts is reduced during the processing, and it is stable and reliable. At the same time, the alignment is convenient and quick through the small plane on the mandrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the expansion core;

[0020] Figure 3 It is a structural sectional view of the utility model;

[0021] Figure 4 is a schematic diagram of the adjustment stud;

[0022] Figure 5 is a schematic diagram of the adjusting stud (convex cone);

[0023] Figure 6 is a cross-sectional view of the adjusting stud (concave cone);

[0024] Figure 7 It is a structural cross-sectional view of the tops of a pair of adjusting studs;

[0025] In the figure, 1 is a thin-walled tube, 2 is an adjusting stud, 3 is a threaded hole, 4 is a gap, 5 is a positioning plane, 6 is a chip groove, 7 is a journal, 8 is a chuck or a turntable of a processing equipment, and 9 is an expansion core. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] Provide an expansion mandrel for thin-walled tube processing and positioning, including an expansion core and an adjusting stud;

[0028] The expansion core is a tube body, and two symmetrical and parallel axial gaps are opened at one end of the tube body, so that one end of the tube body forms two parts based on the symmetrical gaps, each part has a radial threaded hole, and the radial threaded holes of the two parts are coaxial; there are two adjusting studs, which match the two threaded holes respectively, and the inner ends of the two adjusting studs are in a top-to-top state; the end structures of the two top-to-top adjusting studs are different, one is concave and the other is convex, and the shapes are adapted; rotating the two studs can make the two parts of one end of the tube body deform relative to or opposite to each other, thereby changing the outer contour size of the expansion core and realizing tensioning and positioning from the inside of the thin-walled tube.

[0029] The inner concave portion is in the shape of an inner cone, and the outer convex portion is in the shape of an outer cone.

[0030] The outer ends of the two adjusting studs are both hexagonal structures.

[0031] The ends of the slits form circular arcs.

[0032] The end of the expansion core forms a journal, and the journal is provided with the threaded hole.

[0033] The angle of the inner and outer cones is 120°. The larger contact surface increases the friction between the two, preventing the screws from loosening due to centrifugal force generated by high-speed rotation of the parts and vibration of the machine tool during processing.

[0034] There is a positioning plane on the mandrel. Align the plane for positioning before using the mandrel each time.

[0035] A chip removal groove is arranged on the outer circle of the mandrel to solve the problem of parts scratching during chip removal.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in this specification may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments described in this specification, but will conform to the broadest scope consistent with the principles and novel features disclosed in this specification.

Claims

1. An expansion mandrel used for thin-walled tube processing and positioning, characterized by: Includes expansion core and adjustment stud; The expansion core is a tube body, and two symmetrical and parallel axial gaps are opened at one end of the tube body, so that one end of the tube body forms two parts based on the symmetrical gaps, each part has a radial threaded hole, and the radial threaded holes of the two parts are coaxial; there are two adjusting studs, which match the two threaded holes respectively, and the inner ends of the two adjusting studs are in a top-to-top state; the end structures of the two top-to-top adjusting studs are different, one is concave and the other is convex, and the shapes are adapted; rotating the two studs can make the two parts of one end of the tube body deform relative to or opposite to each other, thereby changing the outer contour size of the expansion core and realizing tensioning and positioning from the inside of the thin-walled tube.

2. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: The inner concave is in the shape of an inner cone, and the outer convex is in the shape of an outer cone.

3. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: The outer ends of the two adjusting studs are both external hexagonal structures.

4. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: The outer ends of the two adjusting studs are both hexagonal structures.

5. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: The ends of the slits form circular arcs.

6. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: The end of the expansion core forms a journal, and the journal is provided with the threaded hole.

7. The expansion mandrel for thin-walled tube processing and positioning according to claim 2, characterized in that: The angle of the inner and outer cones is 120°.

8. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: A positioning plane is arranged on the mandrel.

9. The expansion mandrel for thin-walled tube processing and positioning according to claim 1, characterized in that: A chip removal groove is arranged on the outer circle of the core shaft.

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