Liquid expansion clamp for grinding outer circle

Abstract

The utility model provides a liquid expansion clamp for grinding an outer circle. The liquid expansion clamp comprises a clamp body, the expansion sleeve core body is connected with the clamp body; the expansion sleeve is arranged on the expansion sleeve core body in a sleeving mode, communicated hydraulic channels are arranged in the clamp body, the expansion sleeve core body and the expansion sleeve, and the hydraulic channels are filled with hydraulic media; the tightness adjusting part is arranged at the opening of the hydraulic channel and used for enabling the outer wall of the expansion sleeve to expand or retract through movement; and the positioning piece is arranged on the expansion sleeve core body and is used for adjusting the axial distance between the gear part and the expansion sleeve core body. According to the liquid expansion clamp for grinding the outer circle, the outer wall of the expansion sleeve can be expanded or retracted by moving the tightness adjusting part, gear parts can be clamped and loosened, operation is convenient, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a liquid expansion clamp for grinding an outer circle. Background Art

[0002] For the processing of some disc parts with shaft shoulders, such as clutch gear parts, these disc parts with shaft shoulders need to be ground on the outer circle. Grinding on the outer circle refers to the process of grinding the outer circle surface with a grinder. This processing method is mainly used to remove the excess on the workpiece surface, improve the dimensional accuracy and surface roughness, so as to meet the product design and use requirements.

[0003] In the prior art, this type of disk-like parts with shaft shoulders have a center hole. In order to grind the outer circle, a tapered mandrel is currently used to pass through the inner hole, and then a heart-shaped chuck is used to clamp one end of the tapered mandrel for transmission processing.

[0004] In the process of realizing the utility model, the inventors found that there are at least the following problems in the prior art: due to the processing error of the aperture of the center hole, the aperture sizes of the center hole are different, the axial positioning positions of the disc parts are different, and automatic processing cannot be achieved when grinding the outer circle. Manual confirmation of the axial distance is required, the production efficiency is low, and there is a risk that the grinding wheel will hit the end face of the disc part. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] Therefore, the purpose of the utility model is to provide a hydraulic expansion fixture for grinding outer circles, which can achieve gapless positioning with disc parts, so that the axial positioning position of each disc part is the same, reducing the labor intensity of operators.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a hydraulic expansion fixture for grinding an outer circle, comprising:

[0008] Clamp concrete;

[0009] An expansion sleeve core body connected to the clamp body;

[0010] An expansion sleeve is sleeved on the expansion sleeve core body, and a communicating hydraulic channel is provided inside the clamp body, the expansion sleeve core body and the expansion sleeve, and the hydraulic channel is filled with hydraulic medium;

[0011] A tension adjustment part, disposed at the opening of the hydraulic channel, for expanding or retracting the outer wall of the expansion sleeve by moving;

[0012] The positioning piece is arranged on the expansion sleeve core body and is used for adjusting the axial distance between the gear part and the expansion sleeve core body.

[0013] According to the hydraulic expansion clamp for grinding the outer circle of the utility model, a hydraulic channel is set in the clamp body, the expansion sleeve core body and the expansion sleeve, and the hydraulic channel is filled with hydraulic medium. By moving the tension adjustment part, the outer wall of the expansion sleeve can be expanded or retracted to complete the clamping and loosening of the gear parts, which is easy to operate and improves production efficiency. In addition, a positioning piece is provided on the hydraulic expansion clamp for grinding the outer circle of the utility model, and the positioning piece can adjust the axial distance between the gear parts and the expansion sleeve core body, so that the axial position of each gear part can be kept consistent, and the processing datum and the design datum are kept unified, thereby improving the manufacturing accuracy of the gear parts.

[0014] According to one embodiment of the utility model, the clamp body includes a mounting handle and a first flange portion connected together, and the hydraulic channel includes a first fluid channel, which includes an axial fluid channel arranged along the axial direction of the mounting handle and a radial fluid channel arranged along the radial direction of the first flange portion.

[0015] According to an embodiment of the utility model, the installation handle is provided with a first threaded hole connected with the axial fluid channel at one end away from the expansion sleeve core, a first plunger is provided in the axial fluid channel, and a first fastener is provided in the first threaded hole.

[0016] According to an embodiment of the utility model, a bushing with an interference fit is provided in the radial liquid channel of the first liquid channel, and the tightness adjustment portion and the inner hole of the bushing can move in the axial direction.

[0017] According to an embodiment of the utility model, the tension adjustment part includes an adjustment bolt and a second plunger, the inner hole of the bushing includes a connected smooth section and a threaded section, the second plunger is slidably connected to the smooth section, and the second plunger is threadedly connected to the threaded section.

[0018] According to an embodiment of the utility model, the expansion sleeve core includes a core shaft and a second flange portion connected together, the top surface of the first flange portion is provided with a first annular groove, and the bottom surface of the second flange portion is provided with a second annular groove.

[0019] According to an embodiment of the utility model, a second liquid channel and a third liquid channel are provided in the core shaft, the second liquid channel is provided with a first communication port on the outer wall of the core shaft, and the third liquid channel is provided with a second communication port on the outer wall of the core shaft.

[0020] According to an embodiment of the utility model, a tapered hole and a second threaded hole are provided inside the core shaft at one end away from the second flange portion, the tapered hole is connected to the second fluid channel, a sealing ball is provided in the tapered hole, and a third plunger is provided in the second threaded hole.

[0021] According to an embodiment of the utility model, an annular groove is provided on the inner wall of the expansion sleeve, and the annular groove is communicated with the first communication port and the second communication port.

[0022] According to an embodiment of the present invention, the first flange portion is provided with a sealing groove on the inner circle of the first annular groove, a sealing ring is provided in the sealing groove, and the sealing ring abuts against the bottom surface of the second flange portion.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used throughout the accompanying drawings to represent the same components. Among them:

[0025] Figure 1 The utility model is a structural schematic diagram of a hydraulic expansion fixture for grinding an outer circle according to an embodiment of the utility model.

[0026] Figure 2 The utility model is a bottom structural schematic diagram of a hydraulic expansion fixture for grinding an outer circle according to an embodiment of the utility model.

[0027] Figure 3 is along Figure 1 Section view along line AA.

[0028] Figure 4 is along Figure 1 Sectional view along line BB.

[0029] Figure 5 The utility model is a schematic structural diagram of a clamping body of a hydraulic expansion clamp for grinding an outer circle in an embodiment of the utility model.

[0030] Figure 6 It is a structural schematic diagram of an expansion sleeve core body of a liquid expansion fixture for grinding an outer circle in an embodiment of the utility model.

[0031] Figure 7 It is a working schematic diagram of a liquid expansion fixture for grinding an outer circle in an embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 1-clamp body, 2-expansion sleeve core, 3-expansion sleeve, 4-positioning piece, 5-tension adjusting part, 6-second fastener, 7-bushing, 8-annular channel, 100-liquid expansion fixture for grinding outer circle, 101-mounting handle, 102-first threaded hole, 103-first flange, 104-first liquid channel, 106-first plunger, 107-first fastener, 108-first annular groove, 109-mounting hole, 200-gear part, 201-second flange, 202-core shaft, 203-second liquid channel, 204-third plunger, 205-third liquid channel, 206-sealing ball, 207-second connecting port, 208-first connecting port, 209-second annular groove, 210-second threaded hole, 290-machined surface, 301-annular groove, 501-adjusting bolt, 502-second plunger. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0035] Figure 1 This is a schematic diagram of the structure of a hydraulic expansion fixture for grinding an outer circle according to an embodiment of the present invention. Figure 1 , Figure 2 and Figure 7 As shown, the embodiment of the utility model provides a hydraulic expansion clamp 100 for grinding an outer circle, comprising a clamp body 1, an expansion sleeve core body 2, an expansion sleeve 3, a positioning member 4 and a tension adjustment portion 5.

[0036] The clamp body 1 mainly serves as a connection. The expansion sleeve core 2 is connected to the clamp body 1. The expansion sleeve core 2 and the clamp body 1 are detachably connected, which is convenient for subsequent replacement and maintenance. The expansion sleeve 3 is sleeved on the expansion sleeve core 2, and the clamp body 1, the expansion sleeve core 2 and the expansion sleeve 3 are provided with a communicating hydraulic channel inside, and the hydraulic channel is filled with hydraulic medium. The tension adjustment part 5 is provided at the opening of the hydraulic channel, and is used to expand or retract the outer wall of the expansion sleeve 3 by moving. The positioning part 4 is provided on the expansion sleeve core 2, and is used to adjust the axial distance between the gear part 200 and the expansion sleeve core 2.

[0037] One end of the clamp body 1 is used to connect with the machine tool, and the entire hydraulic expansion clamp 100 for grinding the outer circle is fixed on the main shaft of the machine tool, so that the hydraulic expansion clamp 100 for grinding the outer circle rotates synchronously with the main shaft of the machine tool. The connection mode of the expansion sleeve core body 2 and the clamp body 1 can be an integral connection or a detachable connection, which can be selected according to actual needs. Since the hydraulic channel is filled with hydraulic medium, when the tension adjustment part 5 squeezes the hydraulic medium inward, the outer wall of the expansion sleeve 3 will expand, and vice versa, when the tension adjustment part 5 moves to the outside of the opening of the hydraulic channel, the outer wall of the expansion sleeve 3 can be restored to the initial state. The part of the expansion sleeve core body 2 that is sleeved by the expansion sleeve 3 and the inner wall of the expansion sleeve 3 are clearance fit or interference fit according to the state of the expansion sleeve 3. The number of positioning members 4 is at least 3, which are arranged along the circumference of the expansion sleeve core body 2. The protruding length of the positioning member 4 relative to the surface of the expansion sleeve core body 2 is configured as the axial distance between the gear part 200 and the expansion sleeve core body 2, and the axial positioning position of the gear part 200 can be changed by adjusting the protruding length of the positioning member 4.

[0038] The hydraulic medium can be hydraulic oil, grease or other medium, which can be selected according to actual needs. The positioning member 4 can be connected in the axial direction by means of threaded connection or sliding connection.

[0039] According to the embodiment of the utility model, the hydraulic expansion clamp for grinding the outer circle is provided with a hydraulic channel in the clamp body, the expansion sleeve core and the expansion sleeve, and the hydraulic channel is filled with hydraulic medium. By moving the tension adjustment part, the outer wall of the expansion sleeve can be expanded or retracted, and the clamping and loosening of the gear parts can be completed, which is convenient to operate and improves production efficiency. In addition, the hydraulic expansion clamp for grinding the outer circle of the utility model is provided with a positioning piece, which can adjust the axial distance between the gear part and the expansion sleeve core, so that the position of each gear part in the axial direction can be consistent, and the processing datum and the design datum are kept consistent, thereby improving the manufacturing accuracy of the gear parts.

[0040] In some embodiments, Figure 3 As shown, the clamp body 1 includes a mounting handle 101 and a first flange portion 103 connected together, and the hydraulic channel includes a first fluid channel 104 , which includes an axial fluid channel arranged along the axial direction of the mounting handle 101 and a radial fluid channel arranged along the radial direction of the first flange portion 103 .

[0041] The length and diameter of the mounting handle 101 are designed according to actual needs and are not specifically limited thereto. The axial and radial fluid channels of the first fluid channel 104 intersect, and the layout structure of the first fluid channel 104 facilitates the filling and replacement of the hydraulic medium. In one example, the mounting handle 101 has a taper and can be adapted to a chuck on a machine tool.

[0042] The mounting handle 101 is provided with a first threaded hole 102 connected to the axial fluid channel at the end away from the expansion sleeve core body 2, a first plunger 106 is provided in the axial fluid channel, and a first fastener 107 is provided in the first threaded hole 102. The first plunger 106 is slidably connected to the axial fluid channel of the first fluid channel 104, and a sealing ring is sleeved on the first plunger 106 to seal the axial fluid channel. The first fastener 107 is threadedly connected to the first threaded hole 102 and can withstand a large pressure of the hydraulic medium. It should be noted that the first fastener 107 is located in the first threaded hole 102 and is kept at a distance from the opening of the first threaded hole 102, and the internal thread therein is used to connect the pull rod of the machine tool.

[0043] An interference-fit bushing 7 is provided in the radial liquid channel of the first liquid channel 104, and the tension adjustment part 5 and the inner hole of the bushing 7 can move axially. The bushing 7 can prevent the tension adjustment part 5 from directly rubbing against the inner wall of the first liquid channel 104, and is also convenient for maintenance and replacement. In one example, the tension adjustment part 5 includes an adjusting bolt 501 and a second plunger 502, and the inner hole of the bushing 7 includes a connected smooth section and a threaded section, the second plunger 502 is slidably connected to the smooth section, and the second plunger 502 is threadedly connected to the threaded section. A sealing ring is mounted on the second plunger 502. In order to facilitate the adjustment of the pressure of the hydraulic medium, the head of the adjusting bolt 501 is exposed outside the first flange part 103, and the groove type of the head can be designed according to actual needs, and no specific limitation is made to this.

[0044] Combination Figures 3 to 6 As shown, in some embodiments, the expansion sleeve core 2 includes a core shaft 202 and a second flange portion 201 connected together, a first annular groove 108 is provided on the top surface of the first flange portion 103, and a second annular groove 209 is provided on the bottom surface of the second flange portion 201. A mounting hole 109 is provided on the first flange portion 103, and the two flange portions can be connected together by the second fastener 6 passing through the second flange portion 201 and the mounting hole 109. The first annular groove 108 and the second annular groove 209 are opposite to each other and have different outer diameters. The first annular groove 108 and the second annular groove 209 can reduce the adhesion between the first flange portion 103 and the second flange portion 201, and can also avoid the deformation of the first flange portion 103 and the second flange portion 201 due to excessive contact area.

[0045] The core shaft 202 is provided with a tapered hole and a second threaded hole 210 at one end away from the second flange portion 201. The tapered hole is connected to the second fluid channel 203. A blocking ball 206 is provided in the tapered hole, and a third plunger 204 is provided in the second threaded hole 210. The blocking ball 206 can be in contact and sealed with the tapered surface of the tapered hole under the action of the third plunger 204. The function of the tapered hole is to open when injecting hydraulic medium so that the hydraulic medium can smoothly enter the hydraulic channel, and then seal it after completion.

[0046] A second liquid channel 203 and a third liquid channel 205 are provided in the core shaft 202. The second liquid channel 203 is provided with a first connecting port 208 on the outer wall of the core shaft 202, and the third liquid channel 205 is provided with a second connecting port 207 on the outer wall of the core shaft 202. An annular groove 301 is provided on the inner wall of the expansion sleeve 3, and the annular groove 301 is connected with the first connecting port 208 and the second connecting port 207. The annular groove 301 forms an annular channel 8 around the space of the core shaft 202. The hydraulic medium uniformly applies pressure to the side wall of the expansion sleeve 3 in the radial direction through the annular channel 8, causing the side wall of the expansion sleeve 3 to undergo elastic deformation and expand outward. The thickness of the elastically deformable side wall in the expansion sleeve 3 can be 2-3mm, and the manufacturing material of the expansion sleeve 3 can be 65 spring steel.

[0047] In order to keep the junction between the first liquid channel 104 and the third liquid channel 205 sealed, the first flange portion 103 is provided with a sealing groove on the inner circle of the first annular groove 108 . A sealing ring is provided in the sealing groove and abuts against the bottom surface of the second flange portion 201 .

[0048] Combination Figures 1 to 7 As shown, the method of using the liquid expansion fixture for grinding the outer circle proposed in the embodiment of the utility model is as follows:

[0049] S101, after the clamp body 1 and the expansion sleeve core body 2 are connected, the first fastener 107 and the first plunger 106 are installed in the installation handle 101, and the extension distance of the positioning member 4 is adjusted;

[0050] S102, injecting grease from the bushing 7 using a grease gun until grease overflows from the hole where the blocking ball 206 is installed;

[0051] S103, installing the blocking ball 206 and the third plunger 204 in place;

[0052] S104, insert the processed gear part 200 into the expansion sleeve 3 for matching, and then inject some grease with a grease gun;

[0053] S105, installing the second plunger 502 and the adjusting bolt 501;

[0054] S106, use a manual tool to rotate the adjusting bolt 501, and manually rotate the added gear part 200 to confirm in advance whether it can be clamped;

[0055] S107, install the assembled hydraulic expansion fixture on the machine tool spindle and tighten it with a tie rod, and use a lever gauge to check the outer circle runout of the hydraulic expansion fixture positioning position;

[0056] S108, tighten the adjusting bolt 501, the expansion sleeve is elastically deformed by the oil pressure, and the gear part 200 is clamped;

[0057] S109, start the processing, grind the outer circle of the processing surface 290, and after the processing is completed, loosen the adjusting bolt 501, shrink the expansion sleeve, and loosen the gear part 200.

[0058] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0062] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hydraulic expansion fixture for grinding an outer circle, characterized in that: include: Clamp body (1); An expansion sleeve core body (2) connected to the clamp body (1); An expansion sleeve (3) is sleeved on the expansion sleeve core (2), and a communicating hydraulic channel is provided inside the clamp body (1), the expansion sleeve core (2) and the expansion sleeve (3), and the hydraulic channel is filled with a hydraulic medium; A tension adjustment portion (5) is provided at the opening of the hydraulic channel and is used to expand or retract the outer wall of the expansion sleeve (3) by moving; A positioning member (4) is arranged on the expansion sleeve core (2) and is used to adjust the axial distance between the gear part (200) and the expansion sleeve core (2).

2. The hydraulic expansion fixture for grinding outer circle according to claim 1, characterized in that: The clamp body (1) comprises a mounting handle (101) and a first flange portion (103) connected together, and the hydraulic channel comprises a first fluid channel (104), wherein the first fluid channel (104) comprises an axial fluid channel arranged along the axial direction of the mounting handle (101) and a radial fluid channel arranged along the radial direction of the first flange portion (103).

3. The hydraulic expansion fixture for grinding outer circle according to claim 2, characterized in that: The mounting handle (101) is provided with a first threaded hole (102) in communication with the axial fluid passage at one end away from the expansion sleeve core (2), a first plunger (106) is provided in the axial fluid passage, and a first fastener (107) is provided in the first threaded hole (102).

4. The hydraulic expansion fixture for grinding outer circle according to claim 2, characterized in that: An interference-fit bushing (7) is provided in the radial liquid channel of the first liquid channel (104), and the tension adjustment portion (5) and the inner hole of the bushing (7) are movable in the axial direction.

5. The hydraulic expansion fixture for grinding outer circle according to claim 4, characterized in that: The tension adjustment portion (5) comprises an adjustment bolt (501) and a second plunger (502); the inner hole of the bushing (7) comprises a connected smooth section and a threaded section; the second plunger (502) is slidably connected to the smooth section; and the second plunger (502) is threadedly connected to the threaded section.

6. The hydraulic expansion fixture for grinding outer circle according to claim 2, characterized in that: The expansion sleeve core (2) comprises a core shaft (202) and a second flange portion (201) connected together, the top surface of the first flange portion (103) is provided with a first annular groove (108), and the bottom surface of the second flange portion (201) is provided with a second annular groove (209).

7. The hydraulic expansion fixture for grinding outer circle according to claim 6, characterized in that: A second liquid channel (203) and a third liquid channel (205) are provided in the core shaft (202); the second liquid channel (203) is provided with a first communication port (208) on the outer wall of the core shaft (202); and the third liquid channel (205) is provided with a second communication port (207) on the outer wall of the core shaft (202).

8. The hydraulic expansion fixture for grinding outer circle according to claim 7, characterized in that: The core shaft (202) is provided with a tapered hole and a second threaded hole (210) at one end away from the second flange portion (201); the tapered hole is connected to the second fluid channel (203); a sealing ball (206) is provided in the tapered hole; and a third plunger (204) is provided in the second threaded hole (210).

9. The hydraulic expansion fixture for grinding outer circle according to claim 7, characterized in that: An annular groove (301) is provided on the inner wall of the expansion sleeve (3), and the annular groove (301) is in communication with the first communication port (208) and the second communication port (207).

10. The hydraulic expansion fixture for grinding outer circle according to claim 7, characterized in that: The first flange part (103) is provided with a sealing groove on the inner circle of the first annular groove (108), a sealing ring is provided in the sealing groove, and the sealing ring abuts against the bottom surface of the second flange part (201).

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