Clamp for lathe

Abstract

The utility model belongs to the technical field of machine tool accessory machining, and particularly relates to a clamp for a lathe. The clamp comprises a fixing plate, a positioning block and a clamping assembly. The positioning block is arranged on the fixing plate. The clamping assembly and the positioning block are arranged adjacently, and the clamping assembly comprises a fixing block and a jacking structure. The fixing block of one clamping assembly, the jacking structure of the other adjacent clamping assembly and the adjacent positioning block jointly define a clamping space used for containing a workpiece. Under the condition that the clamp positions and clamps the workpiece, the adjacent fixing blocks, the adjacent jacking structures and the adjacent positioning blocks abut against the workpiece. The clamp is used for the lathe, milling machining is replaced with turning machining, a workpiece is positioned and clamped through the clamp firstly, the clamping force of the clamp is larger than cutting force generated in the turning machining process, the positioning and clamping stability and the workpiece machining precision are improved, and then the workpiece machining efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of machine tool accessory processing technology, specifically relating to a fixture for a lathe. Background Technology

[0002] Currently, during the manufacturing of car door hinges, the front arc surface of the hinge is machined using double-sided cross-milling. The door hinge is a critical connecting component of the car body, and its machining quality, especially the dimensional accuracy and surface quality of the arc surface, directly affects the assembly precision, opening and closing smoothness, and service life of the door.

[0003] In related technologies, a car door hinge is held in a fixture and its arc surface is milled. During the machining process, insufficient clamping force of the fixture and excessive milling force can cause the fixture to loosen during positioning, resulting in dimensional deviations of the arc surface. When assembled onto the car door, this can lead to abnormal noises from the door. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the related art.

[0005] Therefore, this application provides a fixture for a lathe, comprising: a fixed plate; a positioning block disposed on the fixed plate; and a clamping assembly disposed adjacent to the positioning block, the clamping assembly including a fixed block and a clamping structure; wherein the fixed block of one clamping assembly, the clamping structure of another adjacent clamping assembly, and the adjacent positioning block together define a clamping space for placing a workpiece; wherein, when the fixture positions and clamps the workpiece, the adjacent fixed block, the clamping structure, and the positioning block respectively abut against different sides of the workpiece.

[0006] In one possible implementation, the clamping assembly further includes: a mounting block fixed to the fixing plate, one side of the mounting block being detachably connected to the fixing block, and a first groove provided on the side of the mounting block facing away from the fixing block; the clamping structure includes a second groove, the second groove being disposed opposite to the first groove and together defining a clamping slide; the clamping assembly further includes a tensioning member and a clamping bolt, the tensioning member being movably disposed within the clamping slide, and the clamping bolt passing through the tensioning member and threadedly connected to the fixing plate; wherein, tightening the clamping bolt causes the tensioning member to move along the clamping slide toward the fixing plate to squeeze between the clamping structure and the mounting block, thereby clamping the workpiece with the clamping structure.

[0007] In one possible implementation, the clamping slide gradually contracts along the direction in which the tensioner presses against the fixed plate.

[0008] In one possible implementation, the mounting block is provided with a slide rail on the side opposite to the fixing block, and the slide rail extends out of the mounting block; the tightening structure is provided with a slide rail corresponding to the slide rail, and the slide rail is slidably connected to the slide rail.

[0009] In one possible implementation, the slide is located on the side of the clamping structure closer to the fixing plate.

[0010] In one possible implementation, the clamping structure further includes: a connecting block having the second groove; and a clamping block detachably disposed on the side of the connecting block opposite to the mounting block for clamping the workpiece.

[0011] In one possible implementation, the positioning block includes a positioning surface facing the center of the fixing plate for abutting against the side of the workpiece to position the workpiece.

[0012] In one possible implementation, multiple clamping components and multiple positioning blocks are provided; the multiple clamping components are evenly and spaced apart along the circumference of the fixing plate, and the multiple positioning blocks are evenly and spaced apart along the circumference of the fixing plate to form multiple clamping spaces.

[0013] In one possible implementation, the fixing plate is provided with a leveling hole located within the clamping space; the fixture further includes a leveling bolt threadedly connected to the leveling hole of the fixing plate for leveling the workpiece.

[0014] In one possible implementation, the fixing plate has an axisymmetric structure, and the center of the fixing plate is provided with a clearance hole.

[0015] The fixture for a lathe provided in this application can achieve at least the following technical effects:

[0016] In this application, the fixture for a lathe includes a fixed plate to achieve stable assembly of the workpiece, clamping assembly, and locating block. The locating block is disposed on the fixed plate, providing a stable and precise positioning reference surface for the workpiece. The clamping assembly is disposed adjacent to the locating block and includes a fixed block and a clamping structure. The fixed block provides a stable clamping surface for the workpiece, providing auxiliary positioning and further improving positioning accuracy. The clamping structure provides an adjustable mechanical clamping force. Through the cooperation of the clamping structure with adjacent fixed blocks and locating blocks, the workpiece can be positioned and clamped in a single placement, providing a large clamping force. The fixed block of one clamping assembly, the clamping structure of another adjacent clamping assembly, and the adjacent locating block together define the clamping space for placing the workpiece. When the fixture positions and clamps the workpiece, the adjacent fixed blocks, clamping structures, and locating blocks respectively abut against the workpiece, achieving the positioning and clamping of the workpiece. Furthermore, the fixture of this application is used on a lathe, replacing milling with turning. The workpiece is first positioned and clamped by the fixture, so that the clamping force of the fixture is greater than the cutting force generated during turning, thereby improving the stability and machining accuracy of positioning and clamping, and thus improving the machining efficiency of the workpiece.

[0017] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0019] Figure 1 This is a schematic diagram of the structure of the fixture provided in the embodiments of this disclosure;

[0020] Figure 2 for Figure 1 A schematic diagram showing the arrangement of the positioning block and two adjacent clamping components provided in the illustrated embodiment;

[0021] Figure 3 for Figure 1 The diagram shows the structure of the clamping assembly provided in the embodiment shown.

[0022] Figure 4 for Figure 1 A schematic diagram showing the arrangement of the mounting blocks and connecting blocks provided in the illustrated embodiment;

[0023] Figure 5 This is a schematic diagram of the structure of the three-jaw chuck clamping fixture provided in the embodiments of this disclosure.

[0024] The reference numerals in the attached figures are as follows:

[0025] 100: Fixture;

[0026] 101: Fixing plate; 102: Leveling hole; 103: Clearance hole; 104: Positioning block; 105: Positioning surface; 106: Clamping assembly; 107: Fixing block; 108: Mounting block; 109: First groove; 110: Slide rail; 111: Tightening structure; 112: Second groove; 113: Pressing slide; 114: Slide; 115: Tensioner; 116: Tightening bolt; 117: Connecting block; 118: Tightening block; 119: Clamping space;

[0027] 200: Workpiece;

[0028] 300: Three-jaw chuck. Detailed Implementation

[0029] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0030] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0031] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0032] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0033] Unless otherwise stated, the term "multiple" means two or more.

[0034] It should be noted that, in the description of this embodiment, the edge of the fixing plate refers to the outer boundary of the fixing plate. Figure 1 and Figure 5 The arrow 'a' in the diagram indicates the edge of the fixing plate. The center of the fixing plate refers to the central area of ​​the fixing plate. Figure 1 and Figure 5 The arrow 'b' in the diagram is used to indicate the center of the fixed plate. Figure 3 The 'c' arrow in the diagram indicates the direction in which the tensioner presses against the fixed plate. Figure 2 The arrow 'd' in the diagram is used to indicate the curved surface of the door hinge.

[0035] Combination Figures 1 to 5 As shown, this application provides a fixture 100 for a lathe, including a fixed plate 101, a positioning block 104, and a clamping assembly 106. The positioning block 104 is disposed on the fixed plate 101. The clamping assembly 106 is disposed adjacent to the positioning block 104, and the clamping assembly 106 includes a fixed block 107 and a clamping structure 111. The fixed block 107 of one clamping assembly 106, the clamping structure 111 of the adjacent clamping assembly 106, and the adjacent positioning block 104 together define a clamping space 119 for placing a workpiece 200. When the fixture 100 positions and clamps the workpiece 200, the adjacent fixed block 107, clamping structure 111, and positioning block 104 respectively abut against the workpiece 200.

[0036] The fixture 100 includes a fixed plate 101, which enables stable assembly of the workpiece 200, the clamping assembly 106, and the positioning block 104. The positioning block 104, which is set on the fixed plate 101, provides a stable and accurate positioning reference surface (i.e., the positioning surface 105 of the positioning block 104) for the workpiece 200.

[0037] The clamping assembly 106 is arranged adjacent to the positioning block 104. The clamping assembly 106 includes a fixing block 107 and a clamping structure 111. The fixing block 107 provides a stable clamping side for the workpiece 200, providing auxiliary positioning and further improving positioning accuracy. The clamping structure 111 provides an adjustable mechanical clamping force. Through the cooperation of the clamping structure 111 with the adjacent fixing block 107 and positioning block 104, the workpiece 200 can be positioned and clamped in one placement, and a large clamping force can be provided.

[0038] The fixing block 107 of one clamping assembly 106, the clamping structure 111 of another adjacent clamping assembly 106, and the adjacent positioning block 104 together define a clamping space 119 for placing the workpiece 200. Specifically, the fixing block 107 of one clamping assembly 106, the clamping structure 111 of another adjacent clamping assembly 106, and the adjacent positioning block 104 correspond to different sides of the workpiece 200 to clamp the workpiece 200.

[0039] When the fixture 100 positions and clamps the workpiece 200, the adjacent fixing block 107, the clamping structure 111, and the positioning block 104 abut against different sides of the workpiece 200 to achieve positioning and clamping of the workpiece 200. That is, the positioning and clamping of a workpiece 200 is provided by two adjacent clamping components 106 and one positioning block 104. Specifically, the workpiece 200 is clamped and pressed onto the fixing plate 101 by the matching modular structure (i.e., the adjacent fixing block 107 and the positioning block 104) and the adjustable flexible clamping structure (i.e., the clamping structure 111).

[0040] In related technologies, milling is used to process the arc surface of a workpiece. This method is complex, costly, and has low stability at high speeds, resulting in low processing efficiency and yield. Compared to related technologies, this embodiment replaces milling with turning, improving processing efficiency and yield. Specifically, the fixture 100 in this embodiment is used on a lathe. Turning is performed on the workpiece 200 instead of milling, and the fixture 100 clamps and positions the workpiece 200. The clamping force of the fixture 100 is greater than the cutting force generated during turning, improving the stability of positioning and clamping, and thus improving the processing efficiency, thereby improving the processing accuracy of the workpiece 200.

[0041] For example, workpiece 200 is a car door hinge, which is an irregular part. The car door hinge is placed in the clamping space 119, so that the adjacent fixing block 107, clamping structure 111, and positioning block 104 abut against different sides of workpiece 200. The fixing block 107 assists in positioning the workpiece 200, achieving positioning in a single placement. The clamping structure 111 then flexibly clamps the workpiece 200, so that the clamping force of the adjacent fixing block 107, clamping structure 111, and positioning block 104 can reach 198N, which is greater than the cutting force generated during machining, thus achieving the desired arc surface of the car door hinge. Figure 2 Stable machining is performed at the location indicated by the arrow d in the middle, thereby achieving high-quality and efficient machining of the door hinge.

[0042] Of course, the fixture 100 in this embodiment is also applicable to the clamping of other parts, such as other parts that need to be machined with arc surfaces.

[0043] In practical applications, the fixture 100 can be made of cast iron, which is low in manufacturing cost, not easily deformed, and can be used for a long time. No special counterweight rules are required, improving reliability during high-speed machining.

[0044] Combination Figure 3 and Figure 4 As shown, in some embodiments, the clamping assembly 106 further includes a mounting block 108, a tightening structure 111, a tensioning member 115, and a clamping bolt 116. The mounting block 108 is fixed to the fixing plate 101, and one side of the mounting block 108 is detachably connected to the fixing block 107. A first groove 109 is provided on the side of the mounting block 108 facing away from the fixing block 107. The tightening structure 111 includes a second groove 112, which is opposite to the first groove 109 and together defines a clamping slide 113. The tensioning member 115 is movably disposed within the clamping slide 113, and the clamping bolt 116 passes through the tensioning member 115 and is threadedly connected to the fixing plate 101. Tightening the clamping bolt 116 causes the tensioning member 115 to move along the clamping slide 113 toward the fixing plate 101 to be squeezed between the tightening structure 111 and the mounting block 108, thereby causing the tightening structure 111 to clamp the workpiece 200.

[0045] In this embodiment, the mounting block 108 serves as the basic support for the entire clamping assembly 106 and is fixed to the fixing plate 101. For example, the mounting block 108 is fixed to the fixing plate 101 by bolts, providing a stable foundation for the entire clamping assembly 106.

[0046] One side of the mounting block 108 is detachably connected to the fixing block 107, for example, by bolts or clips. When the fixing block 107 wears out and needs to be replaced, only the fixing block 107 can be replaced without replacing the mounting block 108 or the entire clamping assembly 106, reducing costs. When different workpieces 200 need to be positioned and clamped, the mounting block 108 can be shared, and only the fixing block 107 adapted to different workpieces 200 needs to be replaced, making replacement convenient and applicable to the processing of various workpieces 200.

[0047] The mounting block 108 has a first groove 109 on the side opposite to the fixing block 107. The tightening structure 111 includes a second groove 112, which is opposite to the first groove 109 and together defines a pressing slide 113, realizing a sliding connection between the tensioning member 115 and the pressing slide 113. The first groove 109 and the second groove 112 can be inclined grooves, allowing the tensioning member 115 to slide into the pressing slide 113 defined by the first groove 109 and the second groove 112, resulting in a sliding fit between the tensioning member 115 and the pressing slide 113.

[0048] The clamping structure 111 includes a second groove 112, which is disposed opposite to the first groove 109 and together defines a clamping slide 113, so that the tensioning member 115 can slide within the set clamping slide 113 to achieve clamping of the workpiece 200.

[0049] The tensioning member 115 is movably disposed within the clamping slide 113. The clamping bolt 116 passes through the tensioning member 115 and is threadedly connected to the fixing plate 101. Specifically, the threaded part of the clamping bolt 116 passes through the tensioning member 115, pushing the tensioning member 115 toward the fixing plate 101, so as to drive the clamping structure 111 to smoothly approach and clamp the workpiece 200 in the direction away from the mounting block 108, thereby improving the positioning accuracy of the workpiece 200.

[0050] Tighten the clamping bolt 116 to move the tensioning member 115 along the clamping slide 113 toward the fixed plate 101 to squeeze between the clamping structure 111 and the mounting block 108, so that the clamping structure 111 clamps the workpiece 200, preventing the workpiece 200 from shifting or vibrating during processing and improving processing stability.

[0051] In practical applications, the tensioner 115 material can be made of Q345 steel, which has low manufacturing cost, is not easily deformed, and can be used for a long time.

[0052] Combination Figure 3 and Figure 4 As shown, in some embodiments, the compression slide 113 gradually contracts along the direction in which the tensioner 115 presses against the fixing plate 101.

[0053] Along the direction of the tensioner 115 pressing against the fixing plate 101 ( Figure 3 (In the direction of arrow c), the pressing slide 113 gradually contracts. That is, along the direction in which the tensioner 115 presses against the fixing plate 101, the distance between the first groove 109 and the second groove 112 gradually decreases. For example, the pressing slide 113 can have an inverted frustum-shaped structure.

[0054] As the tensioner 115 presses against the fixed plate 101, the clamping slide 113 gradually contracts. This allows the tensioner 115, driven by the clamping bolt 116, to press against the fixed plate 101, pushing the clamping structure 111 to move away from the mounting block 108. In practical applications, when the tensioner 115 presses against the fixed plate 101, it pushes the clamping structure 111 towards the workpiece 200, so that the clamping structure 111 cooperates with the adjacent fixed block 107 and positioning block 104 to clamp the workpiece 200.

[0055] For example, by tightening the clamping bolt 116, the tensioning member 115 is moved along the clamping slide 113 toward the fixing plate 101 to be squeezed between the clamping structure 111 and the mounting block 108. The clamping slide 113 gradually contracts to push the clamping structure 111 toward the side away from the mounting block 108, so that the clamping structure 111 moves toward the workpiece 200, so that the clamping structure 111 cooperates with the adjacent fixing block 107 and positioning block 104 to clamp the workpiece 200.

[0056] In one alternative embodiment, the shape of the tensioner 115 is adapted to the pressing slide 113. That is, along the direction in which the tensioner 115 presses against the fixing plate 101, the outer wall of the tensioner 115 gradually contracts. For example, the tensioner 115 has an inverted frustum-shaped structure. This ensures that when the tensioner 115 is squeezed between the tightening structure 111 and the mounting block 108, the surface of the tensioner 115 fits against the first groove 109 and the second groove 112, achieving stable compression.

[0057] Combination Figure 3 and Figure 4 As shown, in some embodiments, a slide rail 110 is provided on the side of the mounting block 108 opposite to the fixing block 107, and the slide rail 110 extends out of the mounting block 108. The tightening structure 111 is provided with a slide rail 114 corresponding to the slide rail 110, and the slide rail 114 is slidably connected to the slide rail 110.

[0058] In this embodiment, a slide rail 110 is provided on the side of the mounting block 108 opposite to the fixing block 107, and the slide rail 110 extends out of the mounting block 108. The tightening structure 111 is provided with a slide rail 114 corresponding to the slide rail 110, and the slide rail 114 is slidably connected to the slide rail 110, thereby realizing the slidable connection between the tightening structure 111 and the mounting block 108. The slide rail 114 can be a strip-shaped groove, and the slide rail 110 can be a strip-shaped structure matching the slide rail 114, allowing the slide rail 110 to extend into the slide rail 114 and slide in cooperation with it.

[0059] Combination Figure 3 and Figure 4 As shown, in some embodiments, the slide 114 is located on the side of the clamping structure 111 near the fixing plate 101. Correspondingly, the slide rail 110 is located on the side of the mounting block 108 near the fixing plate 101.

[0060] In this embodiment, the slide 114 is located on the side of the clamping structure 111 close to the fixed plate 101, which can provide a more stable moving reference for the entire movement process of the clamping structure 111, so that the clamping structure 111 can accurately clamp onto the workpiece 200.

[0061] For example, the slide 114 is located on the side of the clamping structure 111 close to the fixing plate 101. When the clamping structure 111 clamps the workpiece 200, the clamping structure 111 moves along the slide rail 110 of the mounting block 108, so that the clamping structure 111 stably and accurately clamps the workpiece 200.

[0062] Combination Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the clamping structure 111 further includes a connecting block 117 and a clamping block 118. The connecting block 117 is provided with a second groove 112. The clamping block 118 is detachably disposed on the side of the connecting block 117 opposite to the mounting block 108, and is used to clamp the workpiece 200. The connecting block 117 is provided with a slide 114.

[0063] In this embodiment, the connecting block 117 is provided with a second groove 112, which cooperates with the first groove 109 of the mounting block 108 to jointly define the pressing slide 113. When the tensioning member 115 moves toward the fixing plate 101, it pushes the connecting block 117 and the pressing block 118 toward the workpiece 200 to press the workpiece 200.

[0064] The clamping block 118 is detachably mounted on the side of the connecting block 117 opposite to the mounting block 108. When the clamping block 118 wears out and needs to be replaced, only the clamping block 118 can be replaced without replacing the connecting block 117 or the entire clamping assembly 106, thus reducing costs. When different workpieces 200 need to be clamped, the mounting block 108 and the connecting block 117 can be shared, and only the clamping block 118 adapted to different workpieces 200 needs to be replaced, making replacement convenient and applicable to the machining of arc surfaces of various workpieces 200.

[0065] In this embodiment, the shapes of the clamping block 118 and the fixing block 107 are not limited, as long as they can be adapted to the side of the workpiece 200. For example, the fixing block 107 can be a wedge block. In practical applications, by replacing the clamping block 118 and the fixing block 107 to adapt to different workpieces 200, the versatility and flexibility of the fixture 100 are improved, and the manufacturing cost is reduced.

[0066] Combination Figure 1 and Figure 5 As shown, in some embodiments, the positioning block 104 includes a positioning surface 105 facing the center of the fixing plate 101, for abutting against the side of the workpiece 200 to position the workpiece 200.

[0067] In this embodiment, the positioning surface 105 of the positioning block 104 faces the center of the fixing plate 101 (the position indicated by arrow b), and the positioning surface 105 abuts against the side of the workpiece 200 to position the workpiece 200. That is, one side of the workpiece 200 is in close contact with the positioning surface 105, which determines the accurate position of the workpiece 200 in one direction within the plane of the fixture 100, thereby improving the positioning accuracy.

[0068] Combination Figure 1 and Figure 5 As shown, in some embodiments, multiple clamping components 106 and positioning blocks 104 are respectively provided. The multiple clamping components 106 are evenly and spaced apart along the circumference of the fixing plate 101. The multiple positioning blocks 104 are evenly and spaced apart along the circumference of the fixing plate 101 to form multiple clamping spaces 119.

[0069] In this embodiment, multiple clamping components 106 and positioning blocks 104 are respectively provided, allowing the fixture 100 to be installed on the lathe once, simultaneously clamping multiple workpieces 200, achieving synchronous processing of multiple workpieces 200 and significantly improving efficiency. The multiple clamping components 106 and multiple positioning blocks 104 are evenly and spaced along the circumference of the fixed plate 101, resulting in minimal vibration and smooth operation of the fixture 100 during high-speed rotation of the lathe, thus achieving high-precision machining. Furthermore, it ensures that each workpiece 200 is consistently clamped.

[0070] For example, multiple clamping assemblies 106 define ten clamping spaces 119, which can clamp ten workpieces 200 at the same time and complete the processing of ten workpieces 200 in one go, greatly improving processing efficiency.

[0071] Combination Figure 1 As shown, in some embodiments, the fixing plate 101 is provided with a leveling hole 102, which is located within the clamping space 119. The fixture 100 also includes a leveling bolt, which is threadedly connected to the leveling hole 102 of the fixing plate 101 for leveling the workpiece 200.

[0072] In this embodiment, the fixing plate 101 is provided with a leveling hole 102, which is located within the clamping space 119. The workpiece 200 is leveled by threading the leveling bolts into the leveling hole 102 of the fixing plate 101, thereby improving the stability of the workpiece 200 during processing.

[0073] For example, the leveling bolt is disposed on the side of the fixing plate 101 opposite to the clamping assembly 106. During the rotation of the leveling bolt relative to the fixing plate 101, the leveling bolt can extend from the leveling hole 102 of the fixing plate 101 and abut against the workpiece 200 to level the workpiece 200.

[0074] In practical applications, two leveling holes 102 and two leveling bolts are each provided. The leveling holes 102 and the leveling bolts can be set one-to-one.

[0075] Combination Figure 1 As shown, in some embodiments, the fixing plate 101 has an axisymmetric structure, and the center of the fixing plate 101 is provided with a clearance hole 103.

[0076] In this embodiment, the fixing plate 101 has an axisymmetric structure to achieve the overall static balance of the fixture 100, improve stability during high-speed machining, and thus improve the machining accuracy of the workpiece 200. The fixing plate 101 has a clearance hole 103 at its center to allow the cutting tool or tool holder to pass through during turning, thus enabling smooth turning.

[0077] For example, refer to Figure 5 As shown. The fixing plate 101 is a circular plate, and a circular hole 103 is provided in the center of the fixing plate 101 as a clearance hole. The fixture 100 is fixed to the lathe by a three-jaw chuck 300. The workpiece 200 is a car door hinge. The fixture 100 can clamp ten car door hinges at the same time, and position the arc surface of the car door hinge to be machined at the clearance hole 103. The arc surface of the ten car door hinges can be machined by turning.

[0078] This disclosure also provides a method for using a fixture 100 for a lathe, comprising the following steps:

[0079] The fixing plate 101, which serves as the main body of the tooling, is placed upright and flat. Multiple (e.g., ten) workpieces 200 are placed in the clamping space 119. Each workpiece 200 is pressed onto the fixing plate 101 by adjacent fixing blocks 107, clamping structures 111 and positioning blocks 104, thus clamping the workpiece 200. The multiple workpieces 200 are arranged at equal intervals along the circumference of the fixing plate 101.

[0080] The fixing plate 101 is positioned and tightened by the three-jaw chuck 300 and installed on the lathe. The workpieces 200 can be leveled using the leveling bolts.

[0081] According to the preset workpiece 200 arc diameter size (the specific size is not limited), the arc surfaces of multiple workpieces 200 are machined, and the machining of the arc surfaces of multiple workpieces 200 is completed in one go, thereby improving the machining efficiency.

[0082] When workpiece 200 is a car door hinge, the fixture 100 of this embodiment is used to clamp workpiece 200, and then the arc surface of the car door hinge is machined by turning, resulting in high machining accuracy. When the machined car door hinge is assembled onto the car body, it has good compatibility with the car body, enabling quiet opening and closing of the car door, and also extending the service life of the hinge.

[0083] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A chuck for a lathe, characterized in that, The clamp comprises: a fixed plate; a positioning block arranged on the fixed plate; a clamping assembly arranged adjacent to the positioning block, comprising a fixed block and a tightening structure; wherein the fixed block of one clamping assembly, the tightening structure of the adjacent other clamping assembly, and the adjacent positioning block jointly define a clamping space for placing a workpiece; wherein, in the case of clamping a workpiece, the adjacent fixed block, the tightening structure and the positioning block are respectively in abutment with the workpiece.

2. The chuck for a lathe according to claim 1, characterized in that, The clamping assembly further comprises: a mounting block fixed on the fixed plate, one side of the mounting block being detachably connected with the fixed block, and the side of the mounting block away from the fixed block being provided with a first recess; the tightening structure comprises a second recess, the second recess being arranged opposite to the first recess and jointly defining a pressing slide; the clamping assembly further comprises a tensioning piece and a pressing bolt, the tensioning piece being movably arranged in the pressing slide, and the pressing bolt being arranged through the tensioning piece and being threadedly connected with the fixed plate; wherein, by rotating the pressing bolt, the tensioning piece is driven to move along the pressing slide towards the fixed plate to be squeezed between the tightening structure and the mounting block, so that the tightening structure tightens the workpiece.

3. The clamp for a lathe according to claim 2, wherein: along the direction in which the tensioning piece is pressed towards the fixed plate, the pressing slide gradually shrinks.

4. The clamp for a lathe according to claim 2, wherein: the side of the mounting block away from the fixed plate is provided with a slide rail, and the slide rail protrudes from the mounting block; the tightening structure is provided with a slide channel corresponding to the slide rail, and the slide channel is in sliding connection with the slide rail.

5. The clamp for a lathe according to claim 4, wherein: the slide channel is located on the side of the tightening structure close to the fixed plate.

6. The chuck as defined in claim 2 wherein, The tightening structure further comprises: a connecting block provided with the second recess; a tightening block detachably arranged on the side of the connecting block away from the mounting block, for tightening the workpiece.

7. The chuck for a lathe according to any one of claims 1 to 6, characterized in that, The positioning block comprises: a positioning surface facing the center of the fixed plate, for abutting with the side surface of the workpiece to position the workpiece.

8. The chuck for a lathe according to any one of claims 1 to 6, characterized in that, The clamping assembly and the positioning block are respectively provided with a plurality of: a plurality of clamping assemblies are uniformly and spaced arranged along the circumference of the fixed plate, and a plurality of positioning blocks are uniformly and spaced arranged along the circumference of the fixed plate, so as to form a plurality of clamping spaces.

9. The clamp for a lathe according to any one of claims 1 to 6, wherein: the fixed plate is provided with a leveling hole, and the leveling hole is located in the clamping space; the clamp further comprises a leveling bolt threadedly connected with the leveling hole of the fixed plate, for leveling the workpiece.

10. The clamp for a lathe according to any one of claims 1 to 6, wherein: the fixed plate is of an axisymmetric structure, and the center of the fixed plate is provided with an avoiding hole.

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