Self-centering clamp and machine tool

Abstract

The utility model relates to the technical field of machine tools, and provides a self-centering clamp and a machine tool. The double screws are arranged in the radial direction of the base and rotationally connected with the base; the double screws comprise a first thread part and a second thread part which are coaxial and opposite in thread rotating direction, and the first thread part and the second thread part are symmetrically arranged with the rotating connecting point as the center; and the clamping mechanisms are slidably connected to the base in the arrangement direction of the double screws, and the clamping mechanisms are in threaded connection with the first threaded part and the second threaded part correspondingly. By means of the arrangement, the center of a workpiece can be automatically positioned to the zero point, namely the position of a rotating connection point, the form and location tolerance such as machining concentricity is guaranteed, workers do not need to correct the positions of the clamping jaws according to experience in the clamping process, complex correction and alignment operation is omitted, the operation complexity is reduced, the labor intensity of the workers and the technical requirements are lowered, and the machining efficiency is improved. Therefore, the clamping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of machine tools, and in particular to a self-centering fixture and machine tool. Background Technology

[0002] In the field of machining, tooling fixtures are key tools for achieving high-precision machining and improving production efficiency. They can not only reduce the labor intensity of workers, but also reduce human error in clamping and misoperation, and effectively avoid problems such as poor product processing caused by the offset of the clamping origin.

[0003] Traditional workpiece clamping fixtures are mostly simple manual clamps, such as ordinary three-jaw chucks and four-jaw chucks.

[0004] Although the above-mentioned fixtures have the advantages of simple structure and low cost, in actual application, the staff needs to use experience to correct the position of the chucks to achieve the initial positioning of the workpiece, and then use measuring tools to align the fixture rotation center with the spindle. This process consumes a lot of time and manpower, resulting in low clamping efficiency. Utility Model Content

[0005] This utility model provides a self-centering fixture and machine tool to solve the problem of low clamping efficiency in the prior art. It has the advantages of high positioning accuracy and clamping efficiency, and simple operation, which effectively improves clamping efficiency.

[0006] This utility model provides a self-centering clamp, comprising:

[0007] Base;

[0008] A twin-screw is arranged radially along the base and rotatably connected to the base; the twin-screw includes a first threaded portion and a second threaded portion that are coaxial and have opposite thread directions, and the first threaded portion and the second threaded portion are symmetrically arranged with the rotatable connection point as the center;

[0009] A clamping mechanism is slidably connected to the base along the arrangement direction of the twin screws. The clamping mechanism is provided in pairs, and the pair of clamping mechanisms are respectively threadedly connected to the first threaded portion and the second threaded portion.

[0010] According to the present invention, a self-centering clamp is provided on the base, and the connecting part is provided with a shaft hole along the radial direction of the base;

[0011] The twin screw also includes an optical axis portion located between the first threaded portion and the second threaded portion, the optical axis portion passing through the shaft hole and rotatingly engaging with the shaft hole;

[0012] The twin screw is provided with a pair of stop portions at intervals, and the pair of stop portions respectively abut against the opposite sides of the connecting portion.

[0013] According to the self-centering clamp provided by this utility model, the connecting part includes:

[0014] An auxiliary block is fixedly connected to the base, and a first groove is provided on the side of the auxiliary block away from the base;

[0015] The positioning block is detachably connected to the auxiliary block. The positioning block has a second groove on one side facing the auxiliary block that corresponds to the position of the first groove. The first groove and the second groove are joined together to form the shaft hole.

[0016] According to the present invention, a self-centering clamp is provided on the base, wherein a first mating part is provided on the base extending along the arrangement direction of the twin screws, and a second mating part is provided on the clamping mechanism. The first mating part and the second mating part are slidably engaged to constrain the clamping mechanism on the base.

[0017] According to the present invention, a self-centering clamp is provided, wherein the first mating part includes a sliding groove and a limiting part; the sliding groove is disposed on the base and extends along the arrangement direction of the twin screws, and the clamping mechanism is embedded in the sliding groove; the limiting part protrudes toward the centerline of the sliding groove.

[0018] The second mating part includes a limiting groove, and the limiting part is slidably embedded in the limiting groove.

[0019] According to the present invention, a self-centering clamp is provided, wherein a pressure plate is detachably connected to the base, and the edge of the pressure plate protrudes toward the centerline of the slide groove to form the limiting part.

[0020] According to the present invention, a self-centering clamping mechanism includes a jaw and a positioning jaw; the jaw is slidably embedded in the groove and threadedly connected to the twin screw, and the positioning jaw is detachably connected to the jaw.

[0021] According to the present invention, a self-centering fixture further includes a base, the base being fixedly connected to the base, and the base being suitable for connecting to a machine tool.

[0022] According to the present invention, a self-centering fixture is provided, wherein a positioning block is fixedly connected to the bottom of the base, which is suitable for engaging with the positioning slot on the machine tool for positioning.

[0023] According to the present invention, a self-centering clamp is provided, wherein the base is in the shape of a disc, and the rotation connection point is located at the center of the base.

[0024] According to the present invention, a self-centering fixture is provided, wherein a fixed tool block is fixedly connected to the base, which is suitable for providing a positioning reference.

[0025] According to the present invention, a self-centering clamp is provided on the base and / or the pedestal, wherein a plurality of weight-reducing holes are provided.

[0026] According to the present invention, a self-centering clamp is provided, wherein at least one end face of the twin screw is provided with a polygonal fitting portion.

[0027] This utility model also provides a machine tool, including a machine tool body and a self-centering fixture as described above, which is fixedly connected to the machine tool body.

[0028] The self-centering fixture and machine tool provided by this utility model have the following advantages: the first and second threaded parts of the twin screw are coaxial and symmetrically arranged with the rotation connection point as the center. When the twin screw is rotated, the two clamping mechanisms will move synchronously toward or away from the rotation connection point, thereby automatically positioning the workpiece center to the zero point, i.e., the position of the rotation connection point. This ensures the machining concentricity and other geometric tolerances. Moreover, during the clamping process, there is no need for the operator to correct the position of the chuck based on experience, which eliminates the complicated correction and alignment operations, reduces the complexity of the operation, lowers the labor intensity and technical requirements of the operator, and thus improves the clamping efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the self-centering fixture provided in this embodiment of the utility model.

[0031] Figure 2 This is an exploded view of the self-centering fixture provided in this embodiment of the utility model.

[0032] Figure 3 This is a top view of the self-centering clamp provided in this embodiment of the utility model.

[0033] Figure 4 yes Figure 3 A cross-sectional view of the self-centering fixture along the AA direction.

[0034] Figure label:

[0035] 10. Base; 11. Connecting part; 110. Auxiliary block; 111. Positioning pressure block; 12. Slide groove; 13. Pressure plate; 20. Twin screw; 200. First threaded part; 201. Second threaded part; 202. Optical shaft part; 203. Stop part; 204. Fitting part; 30. Clamping mechanism; 300. Claw; 301. Positioning claw; 31. Limiting groove; 40. Base; 400. Weight reduction hole; 41. Positioning block; 42. Fixed tool block; 50. Workpiece. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] To better understand the self-centering fixture and machine tool provided in this utility model embodiment, we will first introduce its application background. In the field of machining, tooling fixtures are key tools for achieving high-precision machining and improving production efficiency, and can effectively avoid defects in machined products caused by offset of the clamping origin.

[0038] Traditional workpiece clamping fixtures are mostly simple manual clamps, such as ordinary three-jaw chucks and four-jaw chucks.

[0039] Although the above-mentioned fixtures have the advantages of simple structure and low cost, in actual application, the staff needs to use experience to correct the position of the chucks to achieve the initial positioning of the workpiece, and then use measuring tools to align the fixture rotation center with the spindle. This process consumes a lot of time and manpower, resulting in low clamping efficiency.

[0040] To address the aforementioned problems, this utility model provides a self-centering fixture and machine tool, which has the advantages of high positioning accuracy and clamping efficiency, and simple operation.

[0041] The following is combined Figures 1-4 This invention describes a self-centering fixture and machine tool.

[0042] Reference Figure 1 and Figure 2A self-centering clamp includes a base 10, a twin screw 20, and a clamping mechanism 30. The twin screw 20 is arranged radially along the base 10 and rotatably connected to the base 10. The twin screw 20 includes a first threaded portion 200 and a second threaded portion 201 that are coaxial and have opposite thread directions. The first threaded portion 200 and the second threaded portion 201 are symmetrically arranged with the rotatable connection point as the center. The clamping mechanism 30 is slidably connected to the base 10 along the arrangement direction of the twin screw 20. A pair of clamping mechanisms 30 are provided, and the pair of clamping mechanisms 30 are threadedly connected to the first threaded portion 200 and the second threaded portion 201, respectively.

[0043] In practical applications, since the first threaded portion 200 and the second threaded portion 201 of the twin screw 20 are coaxial and symmetrically arranged with the rotation connection point as the center, when the twin screw 20 is rotated, the two clamping mechanisms 30 will move synchronously toward or away from the rotation connection point, thereby automatically positioning the center of the workpiece 50 to the zero point, i.e., the position of the rotation connection point, ensuring the machining concentricity and other geometric tolerances. Moreover, during the clamping process, there is no need for the operator to correct the position of the clamping mechanism 30 based on experience, eliminating the complex correction and alignment operations, reducing the complexity of the operation, lowering the labor intensity and technical requirements of the operator, and thus improving the clamping efficiency.

[0044] In some optional embodiments, the material, size, and other parameters of the self-centering fixture can be flexibly designed according to the actual application scenario, as long as the required clamping needs are met. No specific restrictions are imposed in this embodiment of the utility model.

[0045] In one embodiment of this utility model, the base 10 is generally in the shape of a disc, and the rotation connection point, i.e. the zero point of the workpiece 50, is located at the center of the base 10. The twin screws 20 are arranged along the diameter of the base 10, and the first threaded portion 200 and the second threaded portion 201 of the twin screws 20 are symmetrically arranged with the center of the base 10 as the center. When the twin screws 20 rotate, the two clamping mechanisms 30 can move synchronously closer to or further away from the center of the base 10, so as to automatically position the center of the workpiece 50 to the center of the base 10.

[0046] To achieve a rotatable connection of the twin screws 20 on the base 10, in one embodiment of this utility model, referring to... Figures 2 to 4 The base 10 is provided with a connecting part 11. Specifically, the connecting part 11 is located at the center of the base 10. The connecting part 11 is provided with a shaft hole along the radial direction of the base 10. The twin screw 20 also includes a light shaft part 202 located between the first threaded part 200 and the second threaded part 201. The light shaft part 202 passes through the shaft hole and rotates with the shaft hole, so that the twin screw 20 can rotate on the connecting part 11 and realize the radial limit of the twin screw 20.

[0047] A pair of stop portions 203 are provided on the twin screw 20 at intervals. Specifically, the stop portions 203 can be provided on the optical axis portion 202. The two stop portions 203 abut against the opposite sides of the connecting portion 11, thereby achieving axial positioning of the twin screw 20. Through the optical axis portion 202, the connecting portion 11 and the pair of stop portions 203, the twin screw 20 can be radially and axially positioned, and the twin screw 20 can rotate around its own axis on the base 10, thereby achieving the rotational connection of the twin screw 20 on the base 10.

[0048] Specifically, the two stop portions 20 are arranged in a ring shape and are coaxial with the twin screw 20 to limit the twin screw 20 axially.

[0049] Specifically, the first threaded portion 200, the second threaded portion 201, and the optical axis portion 202 of the twin screw 20 can be integrally machined to ensure the structural strength and ease of processing of the twin screw 20.

[0050] To facilitate the connection between the twin screw 20 and the base 10, in one embodiment of this utility model, the connecting part 11 includes an auxiliary block 110 and a positioning pressure block 111. The auxiliary block 110 is fixedly connected to the base 10. Specifically, the auxiliary block 110 and the base 10 can be fixed by welding, integral molding, or connected by bolts or other connecting components. This embodiment of the utility model does not impose specific limitations. A semi-circular first groove is provided on the side of the auxiliary block 110 away from the base 10. The positioning pressure block 111 is detachably connected to the auxiliary block 110. A semi-circular second groove, corresponding to the position of the first groove, is provided on the side of the positioning pressure block 111 facing the auxiliary block 110. The first groove and the second groove are joined to form the aforementioned shaft hole.

[0051] In some optional embodiments, the positioning block 111 and the auxiliary block 110 can be directly connected using bolts or other connecting components, thereby forming a shaft hole by splicing the two together; alternatively, the positioning block 111 and the base 10 can be connected using bolts or other connecting components, thereby forming a shaft hole by splicing the positioning block 111 and the auxiliary block 110 together. The specific choice can be made according to actual needs, and no specific limitations are imposed in this embodiment of the present invention.

[0052] With the above technical solution, when assembling the twin screw 20 and the base 10, the optical axis part 202 of the twin screw 20 can be embedded radially into the first groove of the auxiliary block 110, and then the positioning pressure block 111 and the auxiliary block 110 can be spliced ​​together. The first groove and the second groove are spliced ​​together to form a shaft hole, so that the optical axis part 202 is rotatably connected in the shaft hole, thereby realizing the rotatable connection of the twin screw 20 on the base 10.

[0053] For ease of operation, in one embodiment of the present invention, a polygonal fitting portion 204 is provided on the end face of at least one end of the twin screw 20, so that the operator can use tools to connect and fit with the fitting portion 204 to drive the twin screw 20 to rotate.

[0054] The fitting part 204 can be set as a polygonal protrusion or a polygonal groove, which can be selected according to actual needs. In addition, the specific shape of the fitting part 204 can also be set according to actual needs.

[0055] In this embodiment, the fitting part 204 is configured as a hexagonal groove so that the operator can use a tool with a hexagonal cross section to insert into the fitting part 204 to drive the twin screw 20 to rotate, thereby driving the two clamping mechanisms 30 to move toward or away from the rotation connection point.

[0056] The specific structure of the clamping mechanism 30 and its connection with the base 10 will be described in detail below with reference to the accompanying drawings.

[0057] The base 10 is provided with a first mating part extending along the arrangement direction of the twin screws 20, and the clamping mechanism 30 is provided with a second mating part. The first mating part and the second mating part are slidably mated to constrain the clamping mechanism 30 to the base 10, prevent the clamping mechanism 30 from detaching from the base 10 during the sliding process, and make the clamping mechanism 30 move along a preset trajectory.

[0058] Based on different practical needs, the first mating part and the second mating part can be set with different structures or forms.

[0059] In one embodiment of this utility model, the first mating part includes a sliding groove 12 and a limiting part; wherein, the sliding groove 12 is disposed on the base 10 and extends along the arrangement direction of the twin screws 20, and the bottom of the clamping mechanism 30 is slidably embedded in the sliding groove 12; the limiting part protrudes towards the centerline of the sliding groove 12; the second mating part includes a limiting groove 31, and the limiting part is slidably embedded in the limiting groove 31. Through the sliding groove 12, the limiting part, and the limiting groove 31, the clamping mechanism 30 can be constrained to the base 10, preventing the clamping mechanism 30 from detaching from the base 10 during sliding, and allowing the clamping mechanism 30 to slide along the arrangement direction of the twin screws 20.

[0060] In order to facilitate the connection of the clamping mechanism 30 to the base 10, in one embodiment of the present invention, a pressure plate 13 is detachably connected to the base 10, and the edge of the pressure plate 13 protrudes toward the center line of the slide groove 12, thereby forming the aforementioned limiting part.

[0061] In actual assembly of clamping mechanism 30 and base 10, the bottom of clamping mechanism 30 is first embedded in sliding groove 12, and then the edge of pressure plate 13 is pushed from one side of clamping mechanism 30 into limiting groove 31 to connect pressure plate 13 and base 10, thereby realizing sliding connection of clamping mechanism 30 on base 10.

[0062] In one embodiment of this utility model, the base 10 and the pressure plate 13 can be detachably connected by bolts or other connecting components.

[0063] In one embodiment of the present invention, the clamping mechanism 30 includes a claw 300 and a positioning claw 301; wherein, the claw 300 is slidably embedded in the slide groove 12 and threadedly connected to the double screw 20, and the limiting groove 31 is formed on the claw 300; the positioning claw 301 is detachably connected to the claw 300.

[0064] In actual operation, the double screw 20 is driven to rotate by a tool. During the rotation of the double screw 20, the jaws 300 of the clamping mechanism 30 are driven to slide in the slide groove 12. The jaws 300 drive the positioning jaws 301 to move to clamp or release the workpiece 50.

[0065] Specifically, the positioning claw 301 and the chuck 300 can be detachably connected using bolts or other connecting components.

[0066] Specifically, the positioning claw 301 is provided with a clamping groove, which matches the shape and size of the part of the workpiece 50 to be clamped. By replacing the positioning claw 301 with clamping grooves of different shapes and specifications, workpieces 50 of various shapes and sizes can be clamped, thereby increasing the applicability of the self-centering fixture.

[0067] In one embodiment of the present invention, the self-centering fixture further includes a base 40, on which the base 10 is fixedly connected. The base 40 is suitable for connection with other equipment such as machine tools.

[0068] Specifically, the base 40 is provided with multiple mounting holes, and the base 40 is connected to the machine tool through mounting holes and connecting components such as bolts.

[0069] To facilitate the installation and positioning of the base 40 with other equipment, a positioning block 41 is fixedly connected to the bottom of the base 40. The machine tool and other equipment are provided with positioning grooves corresponding to the position of the positioning block 41. The positioning block 41 is suitable for fitting into the positioning groove to realize the positioning and installation of the base 40 with other equipment, thereby improving the convenience of connecting the self-centering fixture with other equipment.

[0070] In one embodiment of this utility model, a plurality of weight-reducing holes 400 are provided on the base 40 and / or the base 10. The weight-reducing holes 400 are used to reduce the weight of the self-centering fixture, achieve lightweighting, and improve the convenience of installation and assembly of the self-centering fixture.

[0071] In one embodiment of this utility model, a fixed blade block 42 is fixedly connected to the base 40 to provide a positioning reference.

[0072] Specifically, the fixed blade block 42 and the base 40 can be detachably connected by bolts or other connecting components.

[0073] In other embodiments of this utility model, in order to ensure sufficient rigidity and prevent deformation during processing from affecting accuracy, the key parts of the self-centering fixture, such as the clamping parts, can be treated with high-strength steel quenching to improve their surface hardness and wear resistance.

[0074] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0075] The machine tool provided by this utility model is described below. The machine tool described below can be referred to in correspondence with the self-centering fixture described above.

[0076] A machine tool includes a machine tool body and a self-centering fixture provided in any of the above embodiments.

[0077] The self-centering fixture and machine tool provided by this utility model embodiment, since the first threaded portion 200 and the second threaded portion 201 of the twin screw 20 are coaxial and symmetrically arranged with the rotation connection point as the center, when the twin screw 20 is rotated, the two clamping mechanisms 30 will move synchronously toward or away from the rotation connection point, thereby automatically positioning the center of the workpiece 50 to the zero point, i.e., the position of the rotation connection point, ensuring the machining concentricity and other geometric tolerances. Moreover, during the clamping process, there is no need for the operator to correct the position of the clamping mechanism 30 based on experience, eliminating the complex correction and alignment operations, reducing the complexity of the operation, reducing the labor intensity and technical requirements of the operator, thereby improving the clamping efficiency.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A self-centering fixture, characterized by, The utility model relates to a double screw extruder, which comprises a base (10), a double screw (20) arranged along the radial direction of the base (10) and rotationally connected with the base (10), the double screw (20) comprising coaxial first and second threaded parts (200, 201) with opposite screw directions, the first threaded part (200) and the second threaded part (201) being symmetrically arranged about a rotationally connected point, and a clamping mechanism (30) slidingly connected with the base (10) along the arrangement direction of the double screw (20), the clamping mechanism (30) being provided with a pair of clamping mechanisms (30) respectively threadedly connected with the first threaded part (200) and the second threaded part (201). The base (10) is provided with a connecting part (11), and an axial hole is arranged on the connecting part (11) along the radial direction of the base (10). The double screw (20) further comprises an optical axis part (202) located between the first threaded part (200) and the second threaded part (201), the optical axis part (202) being arranged in the axial hole and rotationally matched with the axial hole. The double screw (20) is provided with a pair of stop parts (203) arranged at intervals, and the pair of stop parts (203) respectively abut against opposite sides of the connecting part (11).

2. The self-centering fixture of claim 1, wherein, The connecting part (11) comprises an auxiliary block (110) fixedly connected with the base (10), a first groove being arranged on the side of the auxiliary block (110) away from the base (10), and a positioning pressing block (111) detachably connected with the auxiliary block (110), a second groove being arranged on the side of the positioning pressing block (111) facing the auxiliary block (110) and corresponding to the position of the first groove, the first groove and the second groove being spliced to form the axial hole. The base (10) is provided with a first matching part extending along the arrangement direction of the double screw (20), the clamping mechanism (30) is provided with a second matching part, the first matching part and the second matching part are slidably embedded with each other, and the clamping mechanism (30) is constrained on the base (10). The first matching part comprises a sliding groove (12) and a limiting part, the sliding groove (12) is arranged on the base (10) and extends along the arrangement direction of the double screw (20), and the clamping mechanism (30) is embedded in the sliding groove (12), and the limiting part is protrudingly arranged towards the center line direction of the sliding groove (12).

3. The self-centering fixture of claim 2, wherein, The second matching part comprises a limiting groove (31), and the limiting part is slidably embedded in the limiting groove (31). The base (10) is detachably connected with a pressing plate (13), the edge of the pressing plate (13) is protrudingly arranged towards the center line direction of the sliding groove (12) and forms the limiting part. The clamping mechanism (30) comprises a clamping jaw (300) and a positioning jaw (301), the clamping jaw (300) is slidably embedded in the sliding groove (12) and threadedly connected with the double screw (20), and the positioning jaw (301) is detachably connected with the clamping jaw (300).

4. The self-centering clamp of any one of claims 1 to 3, wherein ​ 5. The self-centering fixture of claim 4, wherein, ​ ​ 6. The self-centering fixture of claim 5, wherein, ​ 7. The self-centering fixture of claim 5, wherein, ​ 8. The self-centering fixture of claim 1, wherein, Also included is a base (40) to which the base (10) is fixedly connected, the base (40) being adapted to be connected to a machine tool.

9. The self-centering fixture of claim 8, wherein, A positioning block (41) is fixedly connected to the bottom of the base (40) and is adapted to be fitted into a positioning groove on the machine tool to perform positioning.

10. A machine tool, characterized by A machine tool body is included, and the self-centering fixture as claimed in any one of claims 1 to 9 is fixedly connected to the machine tool body.

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