External grinding clamp

Abstract

The utility model belongs to the technical field of part machining, and particularly relates to an external grinding clamp which is used for clamping an expansion sleeve when the outer circle of the annular expansion sleeve is machined, and the section of the expansion sleeve is in an L shape. The external grinding clamp comprises a core rod and a clamping nut, clamping points are arranged at the two axial ends of the core rod, and the external grinding clamp can be coaxially clamped on a grinding machine spindle based on the two clamping points. The clamping nut is provided with an internal thread which can be in threaded connection with the external thread on one side of the core rod; the core rod and the clamping nut which can be in threaded connection are arranged, the inner ring surface and the axial outer ring surface of the expansion sleeve are clamped between the core rod and the clamping nut, the non-external grinding surface of the expansion sleeve is clamped by adopting a simple and reliable structure, the expansion sleeve is reliably supported, force application avoidance during external grinding of the expansion sleeve is avoided, the machining precision is improved, and the machining cost is reduced. Meanwhile, the external grinding clamp is simple in structure, convenient to use and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of part processing, and particularly relates to an external grinding fixture. Background Art

[0002] In the processing technology of an expansion sleeve, external grinding needs to be performed on the axial outer ring of the expansion sleeve based on a grinding machine so that the expansion sleeve meets the technical requirements. At present, there is no special fixture for external grinding of the expansion sleeve, so the production efficiency is too low and there are disadvantages of excessive machining dimension deviation. Content of the Utility Model

[0003] In view of this, the utility model provides an external grinding fixture, which is provided with a mandrel and a clamping nut that can be threadedly connected, and clamps the inner ring surface and the axial outer ring surface of the expansion sleeve between the mandrel and the clamping nut. It uses a simple and reliable structure to clamp the non-external grinding surface of the expansion sleeve and gives reliable support to the expansion sleeve, avoiding the force avoidance during external grinding of the expansion sleeve, improving the machining accuracy. At the same time, the external grinding fixture of the utility model has a simple structure, is easy to use and has a low cost.

[0004] The specific technical solution adopted by the utility model is as follows:

[0005] An external grinding fixture for clamping an expansion sleeve when machining the outer circle of the annular expansion sleeve, the cross-section of the expansion sleeve being L-shaped; the external grinding fixture includes:

[0006] A mandrel, with clamping points provided at both axial ends, and can be coaxially clamped on the grinding machine spindle based on the two clamping points;

[0007] A clamping nut, provided with an internal thread that can be threadedly connected to the external thread on one side of the mandrel;

[0008] Wherein: a first clamping surface centered on the grinding machine spindle is provided on the mandrel, and the first clamping surface is conformally arranged with the inner ring surface of the expansion sleeve;

[0009] One end of the clamping nut close to the mandrel is provided with a second clamping surface centered on the grinding machine spindle, and the second clamping surface is conformally arranged with the axial outer ring surface of the expansion sleeve;

[0010] After the mandrel and the clamping nut clamp the expansion sleeve, the radial outer ring of the expansion sleeve is located at the axial outer edge of the mandrel.

[0011] Further, lugs are provided on the mandrel; one end of the lug forms the first clamping surface.

[0012] Further, a plurality of threaded holes are provided on the lug and are circumferentially and uniformly distributed around the spindle; each threaded hole penetrates the lug to reach the first clamping surface.

[0013] Further, the external grinding fixture further includes an ejector screw; the ejector screw is used to push the expansion sleeve away from the mandrel after passing through the threaded hole.

[0014] Further, one end of the threaded hole away from the first clamping surface is flared, and the flared part is used to accommodate the tail of the ejector screw.

[0015] Further, both the external thread and the internal thread are coaxial with the grinding spindle.

[0016] Further, the clamping nut is an internal hexagonal nut.

[0017] The utility model can also bring the following beneficial effects:

[0018] The mandrel of the utility model is provided with a lug, and a threaded hole is arranged on the lug to install the ejector screw; after external grinding of the expansion sleeve, if the expansion sleeve cannot be manually detached from the mandrel, the ejector screw can be used to perform an ejection operation on the expansion sleeve.

[0019] The threaded hole of the utility model is provided with a flare, so that the ejector screw can be installed on the lug in advance without affecting the high-speed rotation of the whole on the grinding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the clamping state of an external grinding fixture in a specific embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the disassembled state of an external grinding fixture in a specific embodiment of the utility model;

[0023] Wherein: 1. Ejector screw; 2. Mandrel; 3. Expansion sleeve; 4. Clamping nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0025] The following describes the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.

[0026] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0027] It should also be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present disclosure schematically. The diagrams only show the components related to the present disclosure, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0028] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0029] In an embodiment of the present utility model, an external grinding fixture is proposed, which is used to clamp the expanding sleeve 3 when machining the outer circle of the annular expanding sleeve 3. As Figure 1 , 2 shown, the cross-section of the expanding sleeve 3 is L-shaped; the external grinding fixture includes:

[0030] A mandrel 2, with clamping points provided at both axial ends, and can be coaxially clamped on the grinding machine spindle based on the two clamping points;

[0031] A clamping nut 4, provided with an internal thread that can be threadedly connected to the external thread on one side of the mandrel 2;

[0032] Wherein, a first clamping surface centered on the grinding machine spindle is provided on the mandrel 2, and the first clamping surface is conformally arranged with the inner ring surface of the expansion sleeve 3;

[0033] One end of the clamping nut 4 close to the mandrel 2 is provided with a second clamping surface centered on the grinding machine spindle, and the second clamping surface is conformally arranged with the axial outer ring surface of the expansion sleeve 3;

[0034] After the mandrel 2 and the clamping nut 4 clamp the expansion sleeve 3, the radial outer ring of the expansion sleeve 3 is located at the axial outer edge of the mandrel 2.

[0035] In this embodiment, lugs are provided on the mandrel 2; one end of the lugs forms the first clamping surface.

[0036] In this embodiment, a plurality of threaded holes are provided on the lugs and are circumferentially and uniformly distributed around the spindle; each of the threaded holes penetrates through the lugs to reach the first clamping surface.

[0037] In this embodiment, the external grinding fixture further includes an ejector screw 1; the ejector screw 1 is used to push the expansion sleeve 3 away from the mandrel 2 after passing through the threaded hole.

[0038] In this embodiment, the end of the threaded hole away from the first clamping surface is flared, and the flared part is used to accommodate the tail of the ejector screw 1.

[0039] In this embodiment, the external thread and the internal thread are both coaxial with the grinding machine spindle.

[0040] In this embodiment, the clamping nut 4 is an internal hexagonal nut.

[0041] In this embodiment, the clamping nut 4 of the hexagonal nut is adopted, and the ejector screw 1 of the internal hexagonal screw is adopted.

[0042] The materials of the external grinding fixture in this embodiment are CrWMn, 65Mn and 45# steel respectively, and are divided into a mandrel 2, an expansion sleeve, a hexagonal nut and 6 M5 internal hexagonal screws. The materials are heat-treated to make the hardness reach HRC50-55, HRC50-55 and HRC35-40 respectively. The processing requirements of the mandrel 2 and the expansion sleeve of the fixture are relatively high, and the central axes must be kept consistent. At the same time, the coloring of the two conical surfaces is not less than 80%.

[0043] Usage method of this embodiment: When clamping the external grinding fixture of this embodiment, first pre-tighten the mandrel 2, the expansion sleeve and the hexagon nut. The socket head cap screw can sink into the mandrel 2, but it must not contact the expansion sleeve. Then use the double-end mechanism of the external cylindrical grinder to tighten the mandrel 2 from the clamping points at both ends of the mandrel 2. Finally, put the product on the expansion sleeve and then tighten the hexagon nut to make the expansion sleeve expand and tighten the product to achieve the purpose of fixing the product. Before processing, check the runout of the part. If the runout is large, it is necessary to use a dial indicator to realign the fixture again. By repeatedly checking that the fixture is concentric with the grinding machine spindle when the part is running out, it can be ensured that the runout of each part after clamping is qualified in the follow-up. When the hexagon nut is loosened after processing and the expansion sleeve cannot naturally withdraw from the mandrel 2, tighten the socket head cap screw to push out the expansion sleeve.

[0044] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present disclosure should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An external grinding fixture, characterized in that, When machining the outer circle of an annular expansion sleeve, it is used to clamp the expansion sleeve, and the cross-section of the expansion sleeve is L-shaped; the external grinding fixture includes: A mandrel, with clamping points provided at both axial ends, and can be coaxially clamped on the grinding machine spindle based on the two clamping points; A clamping nut, provided with an internal thread that can be threadedly connected to the external thread on one side of the mandrel; Wherein: a first clamping surface centered on the grinding machine spindle is provided on the mandrel, and the first clamping surface is conformally arranged with the inner ring surface of the expansion sleeve; One end of the clamping nut close to the mandrel is provided with a second clamping surface centered on the grinding machine spindle, and the second clamping surface is conformally arranged with the axial outer ring surface of the expansion sleeve; After the mandrel and the clamping nut clamp the expansion sleeve, the radial outer ring of the expansion sleeve is located at the axial outer edge of the mandrel.

2. The external grinding fixture according to claim 1, characterized in that, A lug is provided on the mandrel; one end of the lug forms the first clamping surface.

3. The external grinding fixture according to claim 2, wherein A plurality of threaded holes are provided on the lug, which are circumferentially and evenly distributed centered on the spindle; each of the threaded holes penetrates through the lug to reach the first clamping surface.

4. The external grinding fixture according to claim 3, characterized in that, The external grinding fixture further includes an ejector screw; the ejector screw is used to push the expansion sleeve away from the mandrel after passing through the threaded hole.

5. The external grinding fixture according to claim 4, wherein, The end of the threaded hole far from the first clamping surface is flared, and the flared part is used to accommodate the tail of the ejector screw.

6. The external grinding fixture according to claim 5, characterized in that, The external thread and the internal thread are both coaxial with the grinding machine spindle.

7. The external grinding fixture according to claim 6, characterized in that, The clamping nut is an internal hexagonal nut.

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