Limiting clamp for milling key groove in eccentric shaft part
By designing a limit fixture, the problems of compact structure and high precision of eccentric shaft parts were solved, achieving high-precision machining and stable clamping, adapting to complex structures, and improving the versatility and durability of the fixture.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIU AN JIANGHAI YONGDA MASCH MFG CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-04-28
AI Technical Summary
In the existing technology, the eccentric shaft parts have a compact structure and high precision requirements, which makes it impossible for conventional fixtures to effectively clamp and process them.
A limiting fixture was designed, including a tooling table, a support body, a support step, an eccentric shaft positioning groove, and an adjustable clamping mechanism. Combined with the positioning protrusion and the clamping mechanism, it achieves precise positioning and stable clamping.
It improves the machining accuracy and stability of eccentric shaft parts, adapts to complex structures, enhances the versatility and flexibility of fixtures, and extends their service life.
Smart Images
Figure CN224169331U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tooling and fixture technology, and in particular to a limiting fixture for milling keyways on eccentric shaft parts. Background Technology
[0002] Eccentric mechanical parts, as core functional components in the field of mechanical transmission, with eccentric shafts as a typical example, play a crucial role in modern manufacturing. With the iterative upgrades of advanced manufacturing technologies, the structural complexity of eccentric shaft parts has significantly increased, and the precision requirements for their surface features (high-precision keyways, irregular hole systems, asymmetric flatness, etc.) are also becoming increasingly stringent, especially the geometric tolerances related to the eccentric outer circle. Currently, most eccentric shafts can be machined using conventional fixtures provided with the machine tool during milling. However, for parts with complex structures and high precision requirements, machining using only conventional fixtures is insufficient.
[0003] like Figure 5 The eccentric part body 100 shown includes an eccentric base 101, an eccentric step 102 on the eccentric base 101, an outer eccentric shaft 103 and a tapered positioning groove 104 on the eccentric step 102, and an eccentric spindle 105 fixedly mounted on the side of the eccentric base 101 away from the eccentric step 102. Three spindle keyways 106 need to be machined on the outer circumference of the eccentric spindle 105, with a required positional tolerance of 0.03 mm. Because the reference hole of this eccentric part is located on the bottom plane of the hole in the eccentric step 102 on one side of the eccentric base 101, and the hole depth of the eccentric step 102 is 3 mm, coupled with the small eccentricity and compact structure of this eccentric part, conventional centers or semi-centers cannot be used normally. Utility Model Content
[0004] This utility model provides a limiting fixture for milling keyways on eccentric shaft parts, which can solve the problem in the prior art that the small eccentricity of eccentric parts and their compact structure make it impossible to use conventional centers or semi-centers normally.
[0005] The objective of this utility model can be achieved through the following technical solutions:
[0006] A limiting fixture for milling keyways on eccentric shaft parts includes a tooling table. A tooling base for fixing the tooling table is fixedly disposed at the center of one side of the tooling table. A support body is fixedly disposed on the other side of the tooling table. The support body is provided with a support step for cooperating with an eccentric step on the part body. An eccentric shaft positioning groove for placing an outer eccentric shaft is provided on the support step. An eccentric shaft clamping mechanism for clamping the outer eccentric shaft is installed on the support step.
[0007] Preferably, the support step is provided with a positioning protrusion that cooperates with the conical positioning groove on the part body.
[0008] Preferably, the surface of the positioning protrusion is coated with a wear-resistant coating, and the tip of the positioning protrusion is designed to be arc-shaped.
[0009] Preferably, the eccentric shaft clamping mechanism consists of two sets of symmetrically threaded bolts installed on the support step.
[0010] Preferably, the eccentric shaft clamping mechanism is a bidirectional symmetrical adjustable clamping mechanism.
[0011] Preferably, the adjustable clamping mechanism includes a connecting support plate fixedly disposed on the outer periphery of the tooling table, a guide base plate fixedly disposed on the side of the connecting support plate away from the tooling table, connecting side plates fixedly disposed at both ends of the guide base plate, an adjusting connecting rod disposed between the two sets of connecting side plates, two sets of lead screw slides symmetrically mounted on the adjusting connecting rod with the support step as the center, and a top pressure rod for clamping the outer eccentric shaft fixedly disposed on the side of the lead screw slide near the support step.
[0012] Preferably, the adjusting connecting rod is a bidirectional threaded screw, which is rotatably installed between two sets of connecting side plates, and a drive knob is fixedly connected to one end of the bidirectional threaded screw. The screw slide is threadedly connected to the adjusting connecting rod and slides against the surface of the guide base plate.
[0013] Preferably, a clamping mechanism for supporting and clamping the eccentric base is fixedly installed on the support body.
[0014] Preferably, the clamping mechanism includes an L-shaped bottom support frame fixedly installed on the support body, a clamping drive cylinder fixedly installed on the bottom support frame, an avoidance groove for avoiding the clamping drive cylinder on the support body, and a clamping block for pressing the eccentric base fixedly installed at the output end of the clamping drive cylinder.
[0015] Preferably, the bottom support frame is provided with an arc-shaped groove that matches the outer periphery of the eccentric base at one end.
[0016] The beneficial effects of this utility model are:
[0017] (1) By using precise positioning and clamping mechanisms, the stability and accuracy of the parts during the machining process are ensured, thereby improving machining accuracy.
[0018] (2) Adaptable to complex structures: This fixture is particularly suitable for eccentric shaft parts with complex structures and high precision requirements, solving the problem that conventional fixtures cannot process.
[0019] (3) Adjustability: The eccentric shaft clamping mechanism is designed as a bidirectional symmetrical adjustable clamping mechanism, which can be adjusted according to the size of different parts, thus improving the versatility and flexibility of the clamp.
[0020] (4) Wear-resistant and durable: The surface of the positioning protrusion is coated with a wear-resistant coating, which improves the service life of the fixture. Attached Figure Description
[0021] The present invention will be further described below with reference to the accompanying drawings.
[0022] Figure 1 This is a three-dimensional structural diagram of a limiting fixture for milling keyways on eccentric shaft parts according to the present invention.
[0023] Figure 2 This is a vertical sectional view of a limiting fixture for milling keyways on eccentric shaft parts according to the present invention.
[0024] Figure 3 This is a schematic diagram of the eccentric shaft clamping mechanism of this utility model;
[0025] Figure 4 This is a schematic diagram of the clamping mechanism of this utility model;
[0026] Figure 5 This is a schematic diagram of the structure of the main body of the component of this utility model.
[0027] Explanation of reference numerals in the attached figures:
[0028] 1. Tooling base; 2. Tooling table; 3. Support body; 31. Clearance groove; 4. Support step; 5. Eccentric shaft positioning groove; 6. Eccentric shaft clamping mechanism; 61. Connecting support plate; 62. Guide base plate; 63. Connecting side plate; 64. Adjusting rod; 65. Drive knob; 66. Screw slide; 67. Top pressure rod; 7. Positioning protrusion; 8. Clamping mechanism; 81. Bottom support frame; 82. Clamping drive cylinder; 83. Clamping block.
[0029] 100. Part body; 101. Eccentric base; 102. Eccentric step; 103. External eccentric shaft; 104. Tapered positioning groove; 105. Eccentric spindle; 106. Spindle keyway. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] Please see Figures 1-5 As shown, this utility model is a limiting fixture for milling keyways on eccentric shaft parts, including a tooling table 2. A tooling base 1 for fixing the tooling table 2 is fixedly arranged at the center of one side of the tooling table 2. A support body 3 is fixedly arranged on the other side of the tooling table 2. A support step 4 is provided on the support body 3 for cooperating with the eccentric step 102 on the part body 100. An eccentric shaft positioning groove 5 for placing an outer eccentric shaft 103 is provided on the support step 4. An eccentric shaft clamping mechanism 6 for clamping the outer eccentric shaft 103 is installed on the support step 4.
[0034] In an optional embodiment, the support step 4 is provided with a positioning protrusion 7 that cooperates with the tapered positioning groove 104 on the part body 100.
[0035] It should be noted that the positioning protrusion 7 cooperates with the tapered positioning groove 104 on the part body 100, which further improves the positioning accuracy of the part on the fixture.
[0036] In an optional embodiment, the surface of the positioning protrusion 7 is coated with a wear-resistant coating, and the tip of the positioning protrusion 7 is designed to be arc-shaped.
[0037] It should be noted that the positioning protrusion 7 is coated with a wear-resistant coating and the tip is designed with a rounded shape, which not only improves wear resistance but also reduces wear during positioning and extends the service life of the fixture.
[0038] In an optional embodiment, the eccentric shaft clamping mechanism 6 consists of two sets of symmetrically threaded bolts mounted on the support step 4.
[0039] It should be noted that the eccentric shaft clamping mechanism 6 adopts a bolt clamping method, which has a simple structure and reliable clamping force, and is suitable for eccentric shaft parts of various sizes.
[0040] Although the bolt clamping mechanism has the advantages of simple structure and convenient operation, the independent control of the two screws makes it impossible to accurately control the feed depth of the screws, which affects the positioning accuracy of the eccentric parts. A clamping mechanism with higher accuracy through bidirectional adjustment is needed to ensure the positioning accuracy of the eccentric parts.
[0041] In an optional embodiment, the eccentric shaft clamping mechanism 6 is a bidirectional symmetrical adjustable clamping mechanism.
[0042] It should be noted that the eccentric shaft clamping mechanism 6 is designed as a bidirectional symmetrical adjustable clamping mechanism, which improves the versatility and flexibility of the fixture and can adapt to eccentric shaft parts of different sizes.
[0043] In an optional embodiment, the adjustable clamping mechanism includes a connecting support plate 61 fixedly disposed on the outer periphery of the tooling table 2. A guide base plate 62 is fixedly disposed on the side of the connecting support plate 61 away from the tooling table 2. Connecting side plates 63 are fixedly disposed at both ends of the guide base plate 62. An adjusting connecting rod 64 is disposed between the two sets of connecting side plates 63. Two sets of lead screw slides 66 are symmetrically installed on the adjusting connecting rod 64 with the support step 4 as the center. A top pressure rod 67 for clamping the outer eccentric shaft 103 is fixedly disposed on the side of the lead screw slide 66 near the support step 4.
[0044] It should be noted that the adjustable clamping mechanism, through the design of the connecting support plate 61, guide base plate 62, connecting side plate 63, adjusting connecting rod 64, lead screw slide 66 and top pressure rod 67, achieves precise clamping and adjustment of the eccentric shaft parts.
[0045] In an optional embodiment, the adjusting link 64 is a bidirectional threaded screw, which is rotatably mounted between two sets of connecting side plates 63, and one end of the bidirectional threaded screw is fixedly connected to a drive knob 65. The screw slide 66 is threadedly connected to the adjusting link 64 and slides against the surface of the guide base plate 62.
[0046] It should be noted that the adjusting rod 64 adopts a two-way threaded screw design. The symmetrical movement of the screw slide 66 is achieved by rotating the drive knob 65, thereby driving the top pressure rod 67 to clamp or loosen the eccentric shaft parts. The operation is simple and the clamping force is uniform.
[0047] In an optional embodiment, a clamping mechanism 8 for supporting and clamping the eccentric base 101 is fixedly installed on the support body 3.
[0048] It should be noted that the design of clamping mechanism 8 further enhances the stability of the parts on the fixture, ensuring accuracy and safety during the machining process.
[0049] In an optional embodiment, the clamping mechanism 8 includes an L-shaped bottom support frame 81 fixedly mounted on the support body 3, a clamping drive cylinder 82 fixedly mounted on the bottom support frame 81, a clearance groove 31 for avoiding the clamping drive cylinder 82 provided on the support body 3, and a clamping block 83 for pressing the eccentric base 101 fixedly mounted on the output end of the clamping drive cylinder 82.
[0050] It should be noted that the clamping block 83 presses or releases the eccentric base 101 by extending and retracting the clamping drive cylinder 82, which is convenient to operate and the clamping force is adjustable.
[0051] In an optional embodiment, the bottom support frame 81 is provided with an arc-shaped groove that mates with the outer periphery of the eccentric base 101 at one end near the eccentric base 101.
[0052] It should be noted that an arc-shaped groove is provided at one end of the bottom support frame 81 near the eccentric base 101, which cooperates with the outer periphery of the eccentric base 101, further improving the stability and accuracy of clamping.
[0053] The working principle of this utility model is as follows: The fixture is fixedly installed on the machine tool via the tooling base 1 to ensure the stability of the entire fixture. The support step 4 on the support body 3 cooperates with the eccentric step 102 on the part body 100 to achieve the initial positioning of the part on the fixture. The eccentric shaft positioning groove 5 on the support step 4 is used to place the outer eccentric shaft 103 to further determine the position of the part. The positioning protrusion 7 cooperates with the conical positioning groove 104 on the part body 100 to achieve the precise positioning of the part on the fixture. The eccentric shaft clamping mechanism 6 is used to clamp the outer eccentric shaft 103 to ensure that the part will not be displaced during processing. The clamping mechanism 8 is used to support and clamp the eccentric base 101 to ensure the overall stability of the part during processing. The clamping mechanism 8 includes a bottom support frame 81 fixedly installed on the support body 3. A clamping drive cylinder 82 is fixedly installed on the bottom support frame 81. A clamping block 83 is fixedly installed at the output end of the clamping drive cylinder 82. The extension and retraction of the clamping drive cylinder 82 drives the clamping block 83 to press or release the eccentric base 101.
[0054] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.
Claims
1. A limiting fixture for milling keyways on eccentric shaft parts, characterized in that, The tooling includes a tooling table (2), a tooling base (1) for fixing the tooling table (2) is fixedly provided at the center of one side of the tooling table (2), a support body (3) is fixedly provided on the other side of the tooling table (2), a support step (4) is provided on the support body (3) for cooperating with the eccentric step (102) on the part body (100), an eccentric shaft positioning groove (5) for placing the outer eccentric shaft (103) is provided on the support step (4), and an eccentric shaft clamping mechanism (6) for clamping the outer eccentric shaft (103) is installed on the support step (4).
2. A limiting fixture for milling keyways on eccentric shaft parts according to claim 1, characterized in that, The support step (4) is provided with a positioning protrusion (7) that cooperates with the tapered positioning groove (104) on the part body (100).
3. A limiting fixture for milling keyways on eccentric shaft parts according to claim 2, characterized in that, The surface of the positioning protrusion (7) is coated with a wear-resistant coating, and the tip of the positioning protrusion (7) is designed to be arc-shaped.
4. A limiting fixture for milling keyways on eccentric shaft parts according to claim 1, characterized in that, The eccentric shaft clamping mechanism (6) consists of two sets of symmetrical threaded bolts installed on the support step (4).
5. A limiting fixture for milling keyways on eccentric shaft parts according to claim 1, characterized in that, The eccentric shaft clamping mechanism (6) is a bidirectional symmetrical adjustable clamping mechanism.
6. A limiting fixture for milling keyways on eccentric shaft parts according to claim 5, characterized in that, The adjustable clamping mechanism includes a connecting support plate (61) fixedly disposed on the outer periphery of the tooling table (2). A guide base plate (62) is fixedly disposed on the side of the connecting support plate (61) away from the tooling table (2). Connecting side plates (63) are fixedly disposed at both ends of the guide base plate (62). An adjusting connecting rod (64) is disposed between the two sets of connecting side plates (63). Two sets of lead screw slides (66) are symmetrically installed on the adjusting connecting rod (64) with the support step (4) as the center. A top pressure rod (67) for clamping the outer eccentric shaft (103) is fixedly disposed on the side of the lead screw slide (66) close to the support step (4).
7. A limiting fixture for milling keyways on eccentric shaft parts according to claim 6, characterized in that, The adjusting link (64) is a bidirectional threaded screw. The bidirectional threaded screw is rotatably installed between two sets of connecting side plates (63), and one end of the bidirectional threaded screw is fixedly connected to a drive knob (65). The screw slide (66) is threadedly connected to the adjusting link (64) and slides against the surface of the guide base plate (62).
8. A limiting fixture for milling keyways on eccentric shaft parts according to any one of claims 1-7, characterized in that, The support body (3) is fixedly installed with a clamping mechanism (8) for supporting and clamping the eccentric base (101).
9. A limiting fixture for milling keyways on eccentric shaft parts according to claim 8, characterized in that, The clamping mechanism (8) includes an L-shaped bottom support frame (81) fixedly installed on the support body (3), a clamping drive cylinder (82) fixedly installed on the bottom support frame (81), a clearance groove (31) for avoiding the clamping drive cylinder (82) provided on the support body (3), and a clamping block (83) for pressing the eccentric base (101) fixedly installed at the output end of the clamping drive cylinder (82).
10. A limiting fixture for milling keyways on eccentric shaft parts according to claim 9, characterized in that, The bottom support frame (81) has an arc-shaped groove that matches the outer periphery of the eccentric base (101) at one end near the eccentric base (101).