Clamp for grinding inner hole of shaft workpiece

Abstract

A shaft workpiece inner hole grinding clamp comprises a clamp body arranged on a shaft workpiece in a sleeving mode, a positioning bush fixed to the rear end of the clamp body and used for supporting and positioning the rear end of the shaft workpiece and an elastic clamping mechanism installed at the front end of the clamp body and used for clamping the shaft workpiece, and is characterized in that the elastic clamping mechanism is close to the front end of the shaft workpiece; the elastic thin-wall sleeve is made of spring steel, the minimum wall thickness of the elastic thin-wall sleeve is 2 + / -0.2 mm, the fastening sliding column assembly is arranged on a clamp body in the radial direction, the elastic thin-wall sleeve is pressed on the inner wall of the clamp body in an interference mode, a rubber injection cavity is formed between the elastic thin-wall sleeve and the clamp body, and the rubber injection cavity is filled with rubber. And the fastening sliding column assembly extends into the rubber injection cavity, so that the rubber is pressed and deformed, and the elastic thin-wall sleeve is expanded on the shaft workpiece. The elastic thin-wall sleeve is expanded on the shaft workpiece to clamp the upper shaft workpiece, the clamping stress is uniform, the workpiece cannot be damaged by clamping, the clamping stability and reliability are high, the machining precision of an inner hole of the shaft workpiece is improved, the clamping operation is simple, and the clamping efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of axle workpiece grinding hole clamps, for clamping positioning when axle workpiece grinding hole. BACKGROUND

[0002] In the processing field, some shaft parts need to be ground in hole, for example, the input shaft of speed reducer needs to be precisely machined in hole during processing, and there is a high coaxiality requirement between the inner hole and the outer circle. In order to ensure the machining accuracy and quality of the inner hole, the shaft part needs to be clamped and positioned using a clamp.

[0003] At present, the commonly used axle part grinding hole clamp mainly has three-jaw chuck, four-jaw chuck, etc., and the defects are: 1. The clamping force of three-jaw chuck and four-jaw chuck is uneven, the clamping force is not easy to control, the product is easy to be damaged, the shaft workpiece is easy to be deformed, and the machining accuracy is affected; 2. The clamping of the two ends of the shaft part needs to adjust the position of the two end claws, the operation is complex, and the clamping efficiency is low. 3. When the length of the shaft part is large, the clamping reliability will decrease, the middle section of the workpiece will be suspended after clamping, the workpiece is easy to be bent, and the machining accuracy of the inner hole will also decrease. UTILITY MODEL CONTENT

[0004] The axle workpiece grinding hole clamp provided by the utility model clamps the elastic thin-wall sleeve on the axle workpiece to form clamping on the axle workpiece, the clamping force is uniform, the workpiece will not be damaged, the stability and reliability of clamping are high, the machining accuracy of the inner hole of the axle workpiece is improved, the clamping operation is simple, and the efficiency is high.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of:

[0006] The axle workpiece grinding hole clamp comprises a clamping body, a positioning bushing fixed at the rear end of the clamping body and supporting and positioning the rear end of the axle workpiece, and an elastic clamping mechanism installed at the front end of the clamping body and clamping the axle workpiece, characterized in that: the elastic clamping mechanism is close to the front end of the axle workpiece, and comprises an elastic thin-wall sleeve made of spring steel and having a minimum wall thickness of 2±0.2 mm and a tight sliding column assembly installed on the clamping body in the radial direction, the elastic thin-wall sleeve is interference press-fitted on the inner wall of the clamping body and forms a glue injection cavity with the clamping body, the glue injection cavity is filled with rubber, and the tight sliding column assembly extends into the glue injection cavity to make the rubber deform under pressure and expand the elastic thin-wall sleeve on the axle workpiece.

[0007] Preferably, the inner wall of the clamping body has a front annular positioning surface, the inner end surface of the elastic thin-wall sleeve abuts against the front annular positioning surface, an annular groove is formed on the outer wall of the elastic thin-wall sleeve, the annular groove and the inner wall of the clamping body form the glue injection cavity, and the wall thickness of the elastic thin-wall sleeve at the position of the annular groove is 2±0.2 mm.

[0008] Preferably, the clamp body is provided with an injection thread hole in communication with the injection cavity, and the injection thread hole is matched with a flat end set screw for sealing.

[0009] Preferably, the clamp body is provided with at least one fastening thread hole corresponding to the fastening slide column assembly, the fastening thread hole is in communication with the injection cavity, and the fastening slide column assembly comprises a slide column sleeve screwed in the fastening thread hole, a slide column clearance fitted in the slide column sleeve, and a fastening bolt rotatably connected to the top of the slide column and screwed with the slide column sleeve, wherein the slide column extends into the injection cavity when the fastening bolt moves downward in the slide column sleeve.

[0010] Preferably, the slide column sleeve has an outwardly protruding annular shoulder, and a sealing gasket is sleeved on the slide column sleeve and clamped between the annular shoulder and the clamp body when the slide column sleeve is screwed in the fastening thread hole.

[0011] Preferably, the inner hole of the slide column sleeve is composed of a threaded section matched with the fastening bolt, a smooth section arranged below the threaded section and clearance fitted with the slide column, and a transition section located between the smooth section and the threaded section, wherein the inner diameter of the transition section is larger than that of the threaded section, the inner diameter of the threaded section is larger than that of the smooth section, and the transition section and the smooth section form an annular step surface for limiting the downward movement of the fastening bolt in the slide column sleeve.

[0012] Preferably, the inner wall of the rear end of the clamp body has a rear annular positioning surface, the positioning bushing is in the shape of a T letter coaxially aligned with the clamp body, the positioning bushing abuts against the rear annular positioning surface and is fastened with the clamp body by a bolt, and the rear end of the shaft workpiece extends into the positioning bushing and abuts against the inner end surface of the positioning bushing.

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

[0014] The utility model discloses a shaft workpiece inner hole grinding clamp, which is provided with an elastic thin-walled sleeve on the inner wall of the front end of the clamp body, forms an injection cavity between the elastic thin-walled sleeve and the clamp body, fills the injection cavity with rubber, and positions the rear end of the shaft workpiece by the positioning bushing when the shaft workpiece is inserted into the clamp body during clamping, and then inserts the fastening slide column assembly into the injection cavity to extrude the rubber in the injection cavity, so that the rubber is deformed to expand the elastic thin-walled sleeve on the shaft workpiece to clamp the shaft workpiece, the clamping force is uniform, the workpiece is not damaged, and the stability and reliability of clamping are high; the clamp body is sleeved on the shaft workpiece to form effective support for the shaft workpiece, reduce the bending deformation rate of the middle section of the long shaft workpiece, and improve the inner hole machining precision of the shaft workpiece; the fastening slide column assembly is inserted into the injection cavity to clamp the shaft workpiece, and the clamping operation is simple and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The drawings show the assembly of the shaft workpiece inner hole grinding clamp and the shaft workpiece in the specific embodiment.

[0016] Figure 2 is a partial enlarged view. Figure 1

[0017] Figure 3 is a schematic view of the slide sleeve. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail below. Figures 1-3 The embodiments of the present application will be described in detail below.

[0019] The shaft workpiece inner hole grinding clamp comprises a clamp body 1 sleeved on a shaft workpiece, a positioning bush 2 fixed at the rear end of the clamp body 1 and supporting and positioning the rear end of the shaft workpiece 100, and an elastic clamping mechanism 3 arranged at the front end of the clamp body 1 and clamping the shaft workpiece 100, characterized in that the elastic clamping mechanism 3 is close to the front end of the shaft workpiece 100 and comprises an elastic thin-wall sleeve 4 made of spring steel and having a minimum wall thickness of 2±0.2 mm and a tight slide column assembly 5 arranged on the clamp body 1 in the radial direction, the elastic thin-wall sleeve 4 is interference-pressed on the inner wall of the clamp body 1 and forms a rubber injection cavity 7 between the clamp body 1, the rubber injection cavity 7 is filled with rubber 6, and the tight slide column assembly 5 extends into the rubber injection cavity 7 to make the rubber 6 deform under pressure and expand the elastic thin-wall sleeve 4 on the shaft workpiece 100.

[0020] The shaft workpiece inner hole grinding clamp described above is provided with the elastic thin-wall sleeve 4 on the inner wall of the front end of the clamp body 1, the elastic thin-wall sleeve 4 and the clamp body 1 form the rubber injection cavity 7, the rubber injection cavity 7 is filled with the rubber 6, when the shaft workpiece 100 is clamped, the shaft workpiece 100 is first inserted into the clamp body 1 so that the rear end of the shaft workpiece 100 is supported and positioned by the positioning bush 2, then the tight slide column assembly 5 is inserted into the rubber injection cavity 7 to extrude the rubber 6 in the rubber injection cavity 7, the rubber 6 deforms under pressure to expand the elastic thin-wall sleeve 4 on the shaft workpiece 100 to form clamping of the shaft workpiece 100, the clamping force is uniform and the workpiece will not be damaged, and the stability and reliability of clamping are high; the clamp body 1 is sleeved on the shaft workpiece to form effective support of the shaft workpiece 100, the bending deformation rate of the middle section of the shaft workpiece 100 when it is long is reduced, and the inner hole machining precision of the shaft workpiece is improved; the clamping of the shaft workpiece 100 is realized by inserting the tight slide column assembly 5 into the rubber injection cavity 7, and the clamping operation is simple and efficient.

[0021] ​The inner wall of the clamping body 1 is provided with a front annular positioning surface 11, the inner end surface of the elastic thin-wall sleeve 4 abuts against the front annular positioning surface 11, the outer wall of the elastic thin-wall sleeve 4 is provided with an annular groove 41, the annular groove 41 and the inner wall of the clamping body 1 jointly form a glue injection cavity 7, and the wall thickness of the elastic thin-wall sleeve 4 at the position of the annular groove 41 is 2±0.2 mm. As can be seen from the drawings, the wall thickness of the elastic thin-wall sleeve 4 at both ends is the largest, the middle part is the annular groove 41, the wall thickness is the smallest, and is 2±0.2 mm. The elastic thin-wall sleeve 4 is in interference fit with the inner wall of the clamping body 1, the front annular positioning surface 11 axially positions the elastic thin-wall sleeve 4, when the fastening slide column assembly 5 extends into the glue injection cavity 7 to extrude the rubber 6, the flow deformation of the rubber 6 will expand the elastic thin-wall sleeve 4 to make the inner diameter of the elastic thin-wall sleeve 4 decrease to clamp the shaft workpiece 100, and when the fastening slide column assembly 5 moves back and separates from the glue injection cavity 7 to eliminate the extrusion on the rubber 6, the rubber 6 will elastically recover, the position of the elastic thin-wall sleeve 4 which is expanded and deformed will also elastically recover, so that the clamping of the shaft workpiece 100 is released.

[0022] The clamping body 1 is provided with a glue injection threaded hole 12 which is communicated with the glue injection cavity 7, and the glue injection threaded hole 12 is sealed by cooperating with a flat-end fastening screw 8. The glue material is injected into the glue injection cavity 7 through the glue injection threaded hole 12, the glue injection threaded hole 12 is sealed by the flat-end fastening screw 8 after the glue injection is completed, and the glue material is solidified to form the rubber 6.

[0023] The clamping body 1 is provided with at least one fastening threaded hole 13 which is corresponding to the fastening slide column assembly 5, the fastening threaded hole 13 is communicated with the glue injection cavity 7, the fastening slide column assembly 5 includes a slide column sleeve 51 which is screwed in the fastening threaded hole 13, a slide column 52 which is clearance fit in the slide column sleeve 51, and a fastening bolt 53 which is rotatably connected to the top of the slide column 52 and is screwed with the slide column sleeve 51, and the slide column 52 extends into the glue injection cavity 7 by moving downward in the slide column sleeve 51 along with the fastening bolt 53. The clamping body 1 is provided with at least one fastening threaded hole 13, the fastening threaded hole 13 is provided with the fastening slide column assembly 5, two to three fastening threaded holes 13 can be provided on the clamping body 1 according to the clamping requirement of the shaft workpiece 100, two to three fastening slide column assemblies 5 are provided on the clamping body 1, the rubber 6 is extruded by the multiple fastening slide column assemblies 5 synchronously, and the clamping force of the shaft workpiece 100 is improved. The slide column sleeve 51 in the fastening slide column assembly 5 is screwed with the fastening threaded hole 13, the fastening bolt 53 is screwed with the slide column sleeve 51 to seal the fastening threaded hole 13, the slide column 52 is pushed to move downward to extend into the glue injection cavity 7 to extrude the rubber 6 when the fastening bolt 53 is rotated downward, the elastic thin-wall sleeve 4 is expanded to clamp the shaft workpiece 100, the slide column 52 is moved upward to separate from the glue injection cavity 7 when the fastening bolt 53 is rotated upward, the extrusion on the rubber 6 is eliminated, the elastic thin-wall sleeve 4 is elastically recovered to release the expanded clamping of the shaft workpiece.

[0024] The sliding sleeve 51 has an outward protruding annular shoulder 54, and a sealing gasket 55 is sleeved on the sliding sleeve 51, and the sealing gasket 55 is clamped between the annular shoulder 54 and the clamping body 1 when the sliding sleeve 51 is screwed in the fastening threaded hole 13. The sealing gasket 55 improves the fastening force of the sliding sleeve 51 in the fastening threaded hole 13, and forms a seal between the fastening threaded hole 13 and the sliding sleeve 51.

[0025] The inner hole of the sliding sleeve 51 is composed of a threaded section 56 matched with the fastening bolt 53, a smooth section 57 arranged below the threaded section 56 and matched with the sliding sleeve 52 in a gap, and a transition section 58 located between the smooth section 57 and the threaded section 56. The inner diameter of the transition section 58 is larger than that of the threaded section 56, the inner diameter of the threaded section 56 is larger than that of the smooth section 57, and an annular step surface 59 is formed between the transition section 58 and the smooth section 57 to limit the downward movement of the fastening bolt 53 in the sliding sleeve 51. When the fastening bolt 53 moves downward in the sliding sleeve 51 to abut against the annular step surface 59, the sliding sleeve 51 cannot continue to move downward, and at this time, the length of the sliding sleeve 52 extending into the glue injection cavity 7 reaches the maximum and cannot continue to extend into the glue injection cavity 7, thereby limiting the length of the sliding sleeve 52 extending into the glue injection cavity 7, avoiding permanent deformation and damage of the elastic thin-walled sleeve 4 caused by excessive extension of the sliding sleeve 52, and improving the structural reliability of the clamp.

[0026] The inner wall of the rear end of the clamping body 1 has a rear annular positioning surface 14, the positioning bushing 2 is in a T-shaped coaxial alignment with the clamping body 1, the positioning bushing 2 abuts against the rear annular positioning surface 14 and is fastened with the clamping body 1 through a bolt, and the rear end of the shaft workpiece 100 extends into the positioning bushing 2 and abuts against the inner end surface of the positioning bushing 2. The rear end of the shaft workpiece 100 is radially supported and axially positioned by the positioning bushing 2, so as to ensure the positioning reliability and stability of the shaft workpiece 100 on the clamp after the shaft workpiece 100 is clamped by the clamp.

[0027] The technical scheme of the embodiments of the utility model is completely described in combination with the drawings, and it should be noted that the described embodiments are only a part of the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. A shaft workpiece inner hole grinding clamp, comprising a clamp body sleeved on a shaft workpiece, a positioning bush fixed at the rear end of the clamp body and supporting and positioning the rear end of the shaft workpiece, and an elastic clamping mechanism mounted at the front end of the clamp body and clamping the shaft workpiece, characterized in that: The elastic clamping mechanism is close to the front end of the shaft workpiece, and comprises an elastic thin-wall sleeve made of spring steel and having a minimum wall thickness of 2±0.2 mm and a tight sliding column assembly arranged on the clamping body in the radial direction, the elastic thin-wall sleeve is interference-pressed on the inner wall of the clamping body and forms a rubber injection cavity with the clamping body, the rubber injection cavity is filled with rubber, and the tight sliding column assembly extends into the rubber injection cavity to make the rubber deformed under pressure and expand the elastic thin-wall sleeve on the shaft workpiece. ​ 2. The shaft workpiece inner hole grinding fixture according to claim 1, characterized in that: The inner wall of the clamping body has a front annular positioning surface, the inner end surface of the elastic thin-wall sleeve abuts against the front annular positioning surface, an annular groove is formed on the outer wall of the elastic thin-wall sleeve, the annular groove and the inner wall of the clamping body jointly form the rubber injection cavity, and the wall thickness of the elastic thin-wall sleeve at the position of the annular groove is 2±0.2 mm.

3. The shaft workpiece inner hole grinding fixture according to claim 1, characterized in that: The clamping body is provided with a rubber injection threaded hole communicating with the rubber injection cavity, and the rubber injection threaded hole is matched with a flat-end tight screw.

4. The shaft workpiece inner hole grinding fixture according to claim 1, characterized in that: The clamping body is provided with at least one tight threaded hole corresponding to the tight sliding column assembly, the tight threaded hole communicates with the rubber injection cavity, the tight sliding column assembly comprises a sliding column sleeve screwed in the tight threaded hole, a sliding column gap-fitted in the sliding column sleeve, and a tight bolt rotatably connected to the top of the sliding column and threadedly matched with the sliding column sleeve, and the sliding column extends into the rubber injection cavity when the tight bolt moves downward in the sliding column sleeve.

5. The shaft workpiece inner hole grinding fixture according to claim 4, characterized in that: The sliding column sleeve has an outwardly protruding annular shoulder, a sealing gasket is sleeved on the sliding column sleeve, and the sealing gasket is clamped between the annular shoulder and the clamping body when the sliding column sleeve is screwed in the tight threaded hole.

6. The shaft workpiece inner hole grinding fixture according to claim 4, characterized in that: The inner hole of the sliding column sleeve comprises a threaded section matched with the tight bolt, a smooth section arranged below the threaded section and gap-fitted with the sliding column, and a transition section located between the smooth section and the threaded section, the inner diameter of the transition section is greater than that of the threaded section, the inner diameter of the threaded section is greater than that of the smooth section, and the transition section and the smooth section form an annular step surface for limiting the downward movement of the tight bolt in the sliding column sleeve.

7. The shaft workpiece bore grinding fixture of claim 1, wherein: The inner wall of the rear end of the clamping body has a rear annular positioning surface, the positioning bushing is in a T-shaped coaxial alignment with the clamping body, the positioning bushing abuts against the rear annular positioning surface and is fastened to the clamping body by a bolt, and the rear end of the shaft workpiece extends into the positioning bushing and abuts against the inner end surface of the positioning bushing.

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