A self-boring micro-expansion fixture for clamping gear inner holes

Abstract

The utility model discloses a can from the micro inflation clamp for clamping gear inner hole, including the body, the body center through the setting of inner hole, is provided with the inflation screw that can move along the axial in the inner hole, clamp body includes the coaxial connection setting of positioning section, transition section and fixed section, and a plurality of first inflation opening that penetrates fixed section along the axial is set up to the fixed section along the circumference, and every first inflation opening all is communicated with the inner hole through an inflation seam, and the inflation seam is set up on the fixed section top surface and penetrates, and the fixed section includes the first clamping section and the second clamping section that are coaxial connection setting from below to above, and the first clamping section diameter is greater than the second clamping section diameter, the utility model discloses a plurality of clamping section are set up, can realize the clamping of the disc type, annular and barrel -shaped workpiece of different inner diameter, the utility model discloses simple structure, convenient production, need not to carry out too much adjustment to the existing equipment, and the cost is low, can effectively promote the precision in workpiece processing process.

Description

Technical Field

[0001] This utility model belongs to the field of lathe machining technology, and relates to fixtures for lathe machining, specifically to a self-machining micro-expansion fixture for clamping the inner hole of a gear. Background Technology

[0002] When machining disc-shaped, ring-shaped, and barrel-shaped workpieces with hole positioning and clamping using a lathe or machining center, positioning by holes and end faces is usually required, using expansion sleeve fixtures or three-jaw internal supports. Existing expansion sleeve fixtures, with a rotational accuracy of 0.02mm, are characterized by high precision, complex structure, small expansion amount, and poor versatility. Furthermore, they require customized end-face support structures, which suffer from long manufacturing cycles and high costs. While three-jaw internal supports offer strong versatility and can be machined to various sizes, their rotational accuracy is typically greater than 0.05mm, resulting in poor precision and potential workpiece deformation when used on thin-walled parts. Improvements are urgently needed. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a self-machined micro-expansion fixture for clamping the inner hole of a gear, so as to solve the technical problems of low accuracy and high manufacturing cost of the existing fixtures that use hole positioning and clamping.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A self-propelled micro-expansion clamp for holding the inner hole of a gear includes a body, wherein an inner hole is provided through the center of the body, and an expansion screw capable of moving axially passes through the inner hole.

[0006] The fixture body includes a positioning section, a transition section and a fixing section coaxially connected. The fixing section has a plurality of first expansion openings axially penetrating the fixing section at intervals along the circumferential direction. Each first expansion opening is connected to the inner hole through an expansion joint. The expansion joint is provided through the top surface of the fixing section.

[0007] The fixed section includes a first clamping section and a second clamping section that are coaxially connected from bottom to top, and the diameter of the first clamping section is larger than the diameter of the second clamping section.

[0008] This utility model also has the following technical features:

[0009] Specifically, it also includes a third clamping section coaxially connected to the front end of the second clamping section, and the diameter of the second clamping section is larger than the diameter of the third clamping section.

[0010] Furthermore, a first mounting groove is provided circumferentially on the outer wall of the transition section near the first clamping section, and a retaining spring is embedded in the first mounting groove.

[0011] Furthermore, a second mounting groove is provided circumferentially on the outer wall of the transition section away from the first clamping section, and an O-ring is embedded in the second mounting groove.

[0012] Furthermore, the transition section is provided with a plurality of second expansion openings that communicate with the inner hole at equal intervals along the circumference, and each of the second expansion openings is connected to one of the first expansion openings.

[0013] Furthermore, a positioning groove is provided along the circumferential direction on the positioning segment.

[0014] Furthermore, the number of the first expansion openings is eight, and the eight first expansion openings are equally spaced along the circumference of the fixed segment.

[0015] Furthermore, the second expansion opening includes a first groove and a second groove that are integrally connected, wherein the width of the first groove along the circumferential direction of the transition section is greater than the width of the second groove along the circumferential direction of the transition section.

[0016] Furthermore, the first groove has a circular cross-section along the circumferential direction of the transition section.

[0017] Furthermore, the main body is also covered with a protective cover, the inner wall of which can fit against the outer wall of the retaining spring and the O-ring.

[0018] Compared with the prior art, this utility model has the following technical effects:

[0019] The self-machining micro-expansion fixture for clamping gear inner holes provided by this utility model can clamp disc-shaped, ring-shaped, and barrel-shaped workpieces with different inner diameters by setting multiple clamping sections. During the processing, the clamping sections and positioning surfaces can be self-machined as needed. This utility model has a simple structure, is easy to manufacture, does not require much adjustment to existing equipment, and has low cost. It can effectively improve the accuracy of workpiece processing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the fixture body structure in Embodiment 1;

[0021] Figure 2 This is a schematic diagram of the fixture body structure in Embodiment 2;

[0022] Figure 3 This is a schematic diagram of the overall structure of Example 1;

[0023] Figure 4 This is a schematic diagram of the protective cover structure;

[0024] Figure 5 This is a schematic diagram of the expansion screw structure.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1-Body, 2-Inner hole, 3-Expansion screw, 4-Snap ring, 5-O-ring, 6-Protective cover; 11-Positioning section, 12-Transition section, 13-Fixing section; 111-Positioning groove; 121-First mounting groove, 122-Second mounting groove, 123-Second expansion opening; 131-First expansion opening, 132-First clamping section, 133-Second clamping section, 134-Third clamping section, 135-Expansion seam; 1231-First groove, 1232-Second groove.

[0027] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0028] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0029] The terms “upper,” “lower,” “front,” “rear,” “top,” and “bottom” used in this utility model are for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. “Inner” and “outer” refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first," "second," and other ordinal numbers are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] In this invention, unless otherwise stated, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Unless otherwise specified, all components in this utility model can be purchased from the market.

[0033] Example 1

[0034] Following the above technical solutions, such as Figure 1 As shown, this embodiment provides a self-machining micro-expansion clamp for holding the inner hole of a gear, including a body 1, with an inner hole 2 extending through the center of the body 1, and a gear as shown in the figure. Figure 5 The expansion screw 3 shown is capable of moving axially.

[0035] The fixture body 1 includes an integrated coaxially connected positioning section 11, a transition section 12, and a fixing section 13. The fixing section 13 has multiple first expansion openings 131 that extend axially and penetrate the fixing section 13 at intervals along the circumference. That is, the first expansion openings 131 communicate with the inner hole 2. The advantage of having multiple first expansion openings 131 at equal intervals along the circumference of the fixing section 13 is that the outward expansion force is evenly distributed on the fixture body 1.

[0036] In this embodiment, the number of first expansion openings 131 is preferably 8; the inner hole 2 is an inner conical hole, and the expansion screw 3 is a conical expansion screw that can cooperate with the inner hole.

[0037] Each first expansion opening 131 is connected to the inner hole 2 through an expansion joint 135, and the expansion joint 131 is provided through the top surface of the fixed section 13; in this embodiment, the number of expansion joints 135 is preferably 8.

[0038] The fixed section 13 includes a first clamping section 132 and a second clamping section 133 that are coaxially connected from bottom to top. The diameter of the first clamping section 132 is larger than the diameter of the second clamping section 133.

[0039] As a preferred embodiment, it further includes a third clamping section 134 coaxially connected to the front end of the second clamping section 133, and the diameter of the second clamping section 133 is larger than the diameter of the third clamping section 134.

[0040] Preferably, the outer diameter of the first clamping section 132 is 120mm to 170mm, the outer diameter of the second clamping section 132 is 70mm to 120mm, and the diameter of the third clamping section 134 is 20mm to 70mm.

[0041] As a preferred option, the clamping section and positioning surface can be machined by self-turning. For example, if the diameter of the second clamping section 132 is 70mm, but the inner diameter of the workpiece to be machined is 60mm, the second clamping section can be machined by self-turning to eliminate the runout caused by the assembly error between the machine tool and the fixture, thereby improving the machining accuracy.

[0042] As a preferred embodiment, the transition section 12 is provided with a first mounting groove 121 along the circumferential direction on the outer wall near the first clamping section 132. The first mounting groove 121 is embedded with a retaining spring 4, which is used to limit the radial opening of the body 1, thereby realizing the positioning of the workpiece.

[0043] Specifically, the tightening screw 3 moves axially within the inner hole 2, thereby causing the snap ring to contract or open in the radial direction of the body.

[0044] As a preferred embodiment of this invention, such as Figure 3 As shown, a second mounting groove 122 is provided circumferentially on the outer wall of the transition section 12 away from the first clamping section 132, and an O-ring 5 is embedded in the second mounting groove 122.

[0045] As a preferred embodiment, the transition section 12 is further provided with a plurality of second expansion openings 123 that communicate with the inner hole 2 at equal intervals along the circumference, and each second expansion opening 123 is connected to a first expansion opening 131. That is, in this embodiment, the number of second expansion openings 123 is also 8.

[0046] As a preferred embodiment, the second expansion opening 123 includes a first groove 1231 and a second groove 1232 integrally connected. The width of the first groove 1231 along the circumferential direction of the transition section 12 is greater than the width of the second groove 1232 along the circumferential direction of the transition section 12, which is beneficial to the opening of the upper end of the body 1.

[0047] As a preferred embodiment, the cross-section of the first groove 1231 along the circumference of the transition section 12 is circular, that is, the first groove 1231 is a cylindrical groove.

[0048] As a preferred embodiment, the main body 1 is further sleeved with a... Figure 4 The protective cover 6 shown has an inner wall that can fit against the outer wall of the retaining spring 4 and the O-ring 5. That is, the protective cover 6 is snapped onto the outside of the O-ring and the retaining spring to prevent iron filings generated during processing from entering the expansion opening.

[0049] Example 2

[0050] Following the above technical solutions, such as Figure 2 As shown, this embodiment provides a self-machined micro-expansion clamp for clamping the inner hole of a gear. The overall structure of the clamp in this embodiment is similar to that in embodiment 1. The only difference is that in this embodiment, the front end of the second clamping section 133 is not provided with a third clamping section 134, and the positioning section 11 is provided with a positioning groove 111 along the circumferential direction.

[0051] In use, the following steps are taken: The main body 1 is mounted on a lathe. A suitable jaw is selected to hold the positioning section 11 of the main body 1. The expansion screw 2 is inserted into the inner hole 2 of the main body 1 and gently tightened with appropriate force. The workpiece to be processed is placed on the fixed section 13, and the expansion screw 2 is tightened, causing the fixed section 13 to expand outwards and tighten with the inner hole of the workpiece. Under this tightened state, the workpiece will be very tightly stretched and will not loosen. The main body 1 is also less prone to damage, preventing tool breakage and tooth chipping. After processing, the expansion screw 2 is loosened, and the fixed section 13 retracts inwards under the action of the retaining spring 4, creating a gap between it and the inner hole of the workpiece. At this point, the processed workpiece can be removed.

[0052] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0054] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A self-propelled micro-expansion clamp for clamping the inner hole of a gear, comprising a body (1), wherein the body (1) has an inner hole (2) through the center, and an expansion screw (3) capable of moving axially passes through the inner hole (2). The main body (1) includes a positioning section (11), a transition section (12) and a fixing section (13) coaxially connected. The fixing section (13) has a plurality of first expansion openings (131) axially penetrating the fixing section (13) at intervals along the circumferential direction. Each first expansion opening (131) is connected to the inner hole (2) through an expansion joint (135). The expansion joint (135) is provided through the top surface of the fixing section (13). The fixed section (13) includes a first clamping section (132) and a second clamping section (133) that are coaxially connected from bottom to top. The diameter of the first clamping section (132) is larger than the diameter of the second clamping section (133).

2. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 1, characterized in that, It also includes a third clamping section (134) coaxially connected to the front end of the second clamping section (133), and the diameter of the second clamping section (133) is larger than the diameter of the third clamping section (134).

3. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 1, characterized in that, The transition section (12) has a first mounting groove (121) circumferentially provided on the outer wall near the first clamping section (132), and a retaining spring (4) is embedded in the first mounting groove (121).

4. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 3, characterized in that, The transition section (12) is provided with a second mounting groove (122) along the circumferential direction on the outer wall away from the first clamping section (132), and an O-ring (5) is embedded in the second mounting groove (122).

5. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 1, characterized in that, The transition section (12) is also provided with a plurality of second expansion openings (123) that communicate with the inner hole (2) at equal intervals along the circumference, and each of the second expansion openings (123) is connected to a first expansion opening (131).

6. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 1, characterized in that, The positioning section (11) has a positioning groove (111) along its circumferential direction.

7. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 1, characterized in that, The number of the first expansion openings (131) is 8, and the 8 first expansion openings (131) are equally spaced along the circumference of the fixed segment (13).

8. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 5, characterized in that, The second expansion opening (123) includes a first groove (1231) and a second groove (1232) integrally connected. The width of the first groove (1231) along the circumferential direction of the transition section (12) is greater than the width of the second groove (1232) along the circumferential direction of the transition section (12).

9. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 8, characterized in that, The first groove (1231) has a circular cross-section along the circumference of the transition section (12).

10. The self-machining micro-expansion clamp for holding the inner hole of a gear as described in claim 4, characterized in that, The main body (1) is also covered with a protective cover (6), and the inner wall of the protective cover (6) can fit against the outer wall of the snap ring (4) and the O-ring (5).

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