Workpiece fixing device

Abstract

The utility model relates to the technical field of auxiliary equipment for workpiece machining, and provides a workpiece fixing device which comprises a first clamping seat, a second clamping seat and a positioning disc, and a first containing groove is formed in the first clamping seat; the second clamping base is provided with a second containing groove which is used for containing the workpiece after being spliced with the first containing groove. A mounting hole penetrating through the thickness direction is formed in the positioning disc, the second clamping seat and the first clamping seat are used for being inserted into the mounting hole after being locked, and the positioning disc is used for being clamped on a clamp of a lathe. By means of the technical scheme, external force borne by a workpiece is evenly distributed when the workpiece is clamped, the machining precision of a finished product can be effectively improved, the generation probability of unqualified products is reduced, the rotating speed and the cutting feeding speed of a lathe can be increased to the reasonable level, the machining time of a single piece is greatly shortened, the overall production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for workpiece processing, and more specifically, to a workpiece fixing device. Background Technology

[0002] Currently, in precision casting, some casting structures require further machining on a lathe. When machining irregularly shaped precision casting workpieces such as tees on a lathe, two-jaw chucks or bending plate chucks are typically used for clamping and fixing. However, these chucks result in uneven stress on the irregularly shaped workpieces, easily leading to deformation, which in turn affects the machining accuracy of the finished product and may even produce defective products. Furthermore, machining can only be performed at low speeds and low feed rates, significantly reducing machining efficiency. Therefore, there is an urgent need for a workpiece fixing device that can stably clamp irregularly shaped workpieces and enable the lathe to perform cutting at a reasonable speed. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a workpiece fixing device, which solves the technical problem in the related technology of needing a workpiece fixing device that can stably clamp irregularly shaped parts and enable the lathe to perform cutting processing at a reasonable speed.

[0004] According to one aspect, at least one embodiment of the present invention provides a workpiece fixing device, comprising:

[0005] A first clamping seat, wherein the first clamping seat has a first receiving groove;

[0006] The second clamping seat has a second receiving groove, which is used to accommodate the workpiece after being spliced ​​with the first receiving groove;

[0007] A positioning plate having a mounting hole extending through the thickness direction; a second clamping seat and a first clamping seat, after being locked together, are inserted into the mounting hole; the positioning plate is used to clamp onto a lathe fixture.

[0008] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, the first clamping seat has a guide groove on the side away from the first receiving groove, the length direction of the guide groove is parallel to the axial direction of the positioning disk, and also includes a guide protrusion, the guide protrusion is disposed in the mounting hole, and the guide protrusion is inserted into the guide groove.

[0009] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, a stop is provided at one end of the positioning plate. After the guide protrusion is inserted into the guide groove, the stop abuts against the first clamping seat to block the first clamping seat.

[0010] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, one end of the positioning plate has a groove communicating with the mounting hole, one end of the stop block is disposed in the groove, and the other end of the stop block extends into the mounting hole to block the first clamping seat.

[0011] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, the first clamping seat has a slot at the position corresponding to the sink groove, and the stop block engages with the slot.

[0012] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, the stop block and the positioning plate are detachably connected.

[0013] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, one of the first clamping seat and the second clamping seat has a positioning groove, and the other has a positioning protrusion for insertion into the positioning groove, wherein the positioning protrusion and the positioning groove are both located on the periphery of the workpiece.

[0014] For example, in a workpiece fixing device provided by at least one embodiment of the present invention, the number of positioning protrusions and positioning grooves are equal, and there are at least two of each, with the positioning protrusions on both sides of the axis of the positioning disk.

[0015] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, the circumferential surface of the positioning disk has a screw hole, the screw hole is located on the side of the second clamping seat away from the first clamping seat and communicates with the mounting hole, and also includes a tightening bolt, the top bolt is threadedly connected to the screw hole and contacts the second clamping seat, for clamping the second clamping seat between the first clamping seat and the tightening bolt.

[0016] For example, in a workpiece fixing device provided in at least one embodiment of the present invention, the screw hole is arranged radially along the positioning plate and located at the center of the second clamping seat.

[0017] The beneficial effects of this utility model embodiment are as follows: In use, the workpiece is first placed in the first receiving groove on the first clamping seat. At this time, part of the workpiece is located in the first receiving groove, and the other part is exposed outside the first clamping seat. Then, the second clamping seat is fastened to the first clamping seat, and the part of the workpiece exposed outside the first clamping seat enters the second receiving groove on the second clamping seat. Then, the second clamping seat and the first clamping seat are locked together. At this time, the workpiece is clamped between the second clamping seat and the first clamping seat. Then, the first clamping seat and the second clamping seat are inserted into the mounting holes of the positioning plate and locked together with the positioning plate. Finally, the positioning plate is clamped on the lathe fixture. After processing, the positioning plate is first removed from the lathe fixture, then the first clamping seat and the second clamping seat are removed from the positioning plate, and then the first clamping seat and the second clamping seat are separated to remove the workpiece.

[0018] The positioning plate ensures uniform and stable support for the first and second clamping seats within the mounting holes. The cooperation between the first and second clamping seats provides uniform and stable support for the workpiece, resulting in a more even distribution of external force during clamping. This effectively prevents deformation caused by excessive localized stress, better ensuring the workpiece's positional accuracy during subsequent machining. This significantly improves the machining accuracy of the finished product, reduces the probability of defective products, and guarantees the stability and consistency of product quality. The stable clamping system provided by this device allows the lathe to achieve optimal speed and feed rate, fully utilizing its performance, significantly shortening single-piece machining time, improving overall production efficiency, and reducing production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model in one direction during specific use according to an embodiment;

[0021] Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention in use from another direction;

[0022] Figure 3 for Figure 1 Cross-sectional view of the embodiment;

[0023] Figure 4 for Figure 1 A schematic diagram of the positioning disk in one direction in the embodiment;

[0024] Figure 5 for Figure 1 A schematic diagram of the positioning disk in another direction in the embodiment;

[0025] Figure 6 for Figure 1 A schematic diagram of the connection structure between the first clamping seat and the second clamping seat in the embodiment;

[0026] Figure 7 for Figure 1 A schematic diagram of the structure of the first clamping seat in one direction in the embodiment;

[0027] Figure 8 for Figure 1 A schematic diagram of the first clamping seat in another direction in the embodiment;

[0028] Figure 9 for Figure 1 A schematic diagram of the connection structure between the workpiece and the first clamping seat in the embodiment;

[0029] Figure 10 for Figure 1 A schematic diagram of the structure of the second clamping seat in the embodiment;

[0030] Figure 11 for Figure 1 A schematic diagram of the connection structure between the workpiece and the second clamping seat in the embodiment.

[0031] In the figure: 1. First clamping seat, 101. First receiving groove, 1011. First main pipe groove, 1012. First branch pipe groove, 102. Guide groove, 103. Slot, 104. Positioning protrusion, 2. Second clamping seat, 201. Second receiving groove, 2011. Second main pipe groove, 2012. Second branch pipe groove, 202. Positioning groove, 3. Positioning plate, 301. Mounting hole, 302. Countersunk groove, 303. Screw hole, 4. Guide protrusion, 5. Stop block, 6. Tightening bolt, 7. Workpiece. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0033] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0034] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection 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.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] like Figures 1-3As shown, this invention illustrates a workpiece fixing device according to one embodiment, including a first clamping seat 1, a second clamping seat 2, and a positioning plate 3. The first clamping seat 1 has a first receiving groove 101. The shape and size of the first receiving groove 101 are designed according to the characteristics of common irregularly shaped workpieces. The depth of the first receiving groove 101 is less than or equal to the outer radius of the workpiece 7. For example, for tee-type workpieces, the first receiving groove 101 is designed to conform to the shape of the main pipe and branches of the tee to achieve a tight fit. The groove wall of the first receiving groove 101 is finely polished, resulting in extremely low surface roughness to reduce scratches on the surface of the workpiece 7.

[0039] The second clamping seat 2 has a second receiving groove 201, which, when spliced ​​with the first receiving groove 101, is used to receive the workpiece 7. The second clamping seat 2 and the first clamping seat 1 are detachably connected. The depth of the second receiving groove 201 is less than or equal to the outer radius of the workpiece 7. The second receiving groove 201 and the first receiving groove 101 are complementary designs, and when spliced ​​together, they can perfectly enclose the workpiece 7. The groove wall of the second receiving groove 201 is finely polished, with extremely low surface roughness, to reduce scratches on the surface of the workpiece 7.

[0040] The positioning disk 3 has a mounting hole 301 that extends through the thickness direction. After the second clamping seat 2 and the first clamping seat 1 are locked, they are inserted into the mounting hole 301 and form a detachable connection with the positioning disk 3. The positioning disk 3 is used to clamp on the fixture of the lathe. The fixture is preferably a three-jaw chuck, which clamps the circumferential surface of the positioning disk 3, so that the positioning disk 3 is reliably clamped and the force is even.

[0041] Taking the positioning disk 3 as an example, with its axis arranged along the front-rear direction and the second clamping seat 2 located above the first clamping seat 1, for a tee-type workpiece, the first receiving groove 101 located on the upper end face of the first clamping seat 1 includes a first main pipe groove 1011 and a first branch pipe groove 1012. The axis of the first main pipe groove 1011 is arranged along the front-rear direction, and the first branch pipe groove 1012 is inclined to the left or right side of the first main pipe groove 1011 and one end is connected to the first main pipe groove 1011. Figure 8 As shown. The second receiving groove 201 located on the lower end face of the second clamping seat 2 includes a second main pipe groove 2011 and a second branch pipe groove 2012. The axis of the second main pipe groove 2011 is arranged in the front-back direction. The second branch pipe groove 2012 is inclined to the left or right side of the second main pipe groove 2011 and one end is connected to the second main pipe groove 2011. Figure 10 As shown. The first main pipe groove 1011 and the second main pipe groove 2011 are joined together to accommodate the main pipe of the tee, and the first branch pipe groove 1012 and the second branch pipe groove 2012 are joined together to accommodate the branch pipe of the tee.

[0042] In use, first place the workpiece 7 in the first receiving groove 101 on the first clamping seat 1. At this time, the lower end of the workpiece 7 is located in the first receiving groove 101, and the upper end protrudes above the first clamping seat 1. Then, fasten the second clamping seat 2 onto the first clamping seat 1, and let the part of the workpiece 7 protruding outside the first clamping seat 1 enter the second receiving groove 201 on the second clamping seat 2. Then, lock the second clamping seat 2 and the first clamping seat 1 together. At this time, the workpiece 7 is clamped between the second clamping seat 2 and the first clamping seat 1. Then, insert the first clamping seat 1 and the second clamping seat 2 into the mounting hole 301 of the positioning plate 3 and lock them together with the positioning plate 3. Finally, clamp the positioning plate 3 onto the lathe fixture. After processing, first remove the positioning plate 3 from the lathe fixture, then remove the first clamping seat 1 and the second clamping seat 2 from the positioning plate 3, and then separate the first clamping seat 1 and the second clamping seat 2 to remove the workpiece 7.

[0043] The positioning plate 3 ensures that the first clamping seat 1 and the second clamping seat 2 receive uniform and stable support within the mounting hole 301. The cooperation of the first clamping seat 1 and the second clamping seat 2 provides uniform and stable support for the workpiece 7. The external force on the workpiece 7 is evenly distributed during clamping, effectively preventing deformation due to excessive localized force. This better ensures the positional accuracy of the workpiece 7 during subsequent processing, effectively improving the machining accuracy of the finished product, reducing the probability of defective products, and guaranteeing the stability and consistency of product quality. The stable clamping system provided by this device enables the lathe to increase its rotational speed and cutting feed rate to a reasonable level, fully utilizing the lathe's performance, significantly shortening the single-piece machining time, improving overall production efficiency, and reducing production costs.

[0044] In some examples, the first clamping seat 1 has a guide groove 102 on the side away from the first receiving groove 101. The length direction of the guide groove 102 is parallel to the axial direction of the positioning disk 3. It also includes a guide protrusion 4, which is disposed in the mounting hole 301 and is inserted into the guide groove 102.

[0045] For example, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, taking the axial direction of the positioning disk 3 as an example, the length direction of the guide groove 102 and the guide protrusion 4 is also set in the front-back direction. When the first clamping seat 1 and the second clamping seat 2 are inserted into the mounting hole 301 of the positioning disk 3 from back to front, the guide protrusion 4 is inserted into the guide groove 102, so that the first clamping seat 1 can only move along the guide protrusion 4. The operator does not need to repeatedly adjust the angle and position, and can quickly and accurately insert the first clamping seat 1 and the second clamping seat 2 into the mounting hole 301 of the positioning disk 3, which can reduce the installation time and possible assembly errors.

[0046] In some examples, a stop 5 is provided at one end of the positioning disk 3. After the guide protrusion 4 is inserted into the guide groove 102, the stop 5 abuts against the first clamping seat 1 to block the first clamping seat 1.

[0047] For example, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, taking the stop 5 located at the front end of the positioning disk 3 as an example, when the first clamping seat 1 and the second clamping seat 2 are inserted from back to front into the mounting hole 301 of the positioning disk 3, the first clamping seat 1 moves along the guide protrusion 4, and the first clamping seat 1 and the second clamping seat 2 gradually approach the stop 5. When the first clamping seat 1 contacts the stop 5, the stop 5 blocks the first clamping seat 1, so that the first clamping seat 1 and the second clamping seat 2 cannot continue to move forward, indicating that the insertion is in place. The operator does not need to repeatedly confirm the installation position, which saves more time and effort.

[0048] In some examples, one end of the positioning disk 3 has a recess 302 communicating with the mounting hole 301, one end of the stop block 5 is disposed in the recess 302, and the other end of the stop block 5 extends into the mounting hole 301 to block the first clamping seat 1.

[0049] For example, such as Figure 1 and Figure 3 As shown, the recess 302 is located on the front end face of the positioning disk 3, and the stop block 5 is embedded in the recess 302. This can prevent the stop block 5 from shifting, making the connection between the stop block 5 and the positioning disk 3 more secure and reliable. Moreover, the stop block 5 does not need to protrude from the outside of the positioning disk 3, making the overall appearance neater and more aesthetically pleasing.

[0050] In some examples, the first clamping seat 1 has a slot 103 at the position corresponding to the sink 302, and the stop block 5 engages with the slot 103.

[0051] For example, such as Figure 1 and Figure 3 As shown, after the stop block 5 is inserted into the slot 103, it not only blocks the first clamping seat 1 in the axial direction, but also limits the possible small displacement of the first clamping seat 1 in other directions to a certain extent. By increasing the contact and connection points, the fixing effect of the first clamping seat 1 in the positioning plate 3 can be enhanced, so that the fixing device can withstand greater cutting force and vibration during lathe machining, thereby better ensuring machining accuracy, reducing the defect rate, and improving the consistency of product quality.

[0052] In some examples, the stop 5 and the positioning plate 3 are detachably connected.

[0053] For example, such as Figure 1 and Figure 3As shown, the connection can be made by bolts or clips. This allows the positioning plate 3 or the stop block 5 to be easily removed from the positioning plate 3 without damaging the positioning plate 3 or the stop block 5 when maintenance or replacement is required, or when the position of the stop block 5 needs to be adjusted according to different clamping requirements. This improves the maintainability and flexibility of the entire device.

[0054] In some examples, one of the first clamping seat 1 and the second clamping seat 2 has a positioning groove 202, and the other has a positioning protrusion 104 for interlocking with the positioning groove 202. Both the positioning protrusion 104 and the positioning groove 202 are located around the workpiece 7.

[0055] For example, such as Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, when the positioning groove 202 is located on the first clamping seat 1, the positioning protrusion 104 is located on the second clamping seat 2. When the positioning groove 202 is located on the second clamping seat 2, the positioning protrusion 104 is located on the first clamping seat 1. When the first clamping seat 1 and the second clamping seat 2 are joined, the positioning protrusion 104 is inserted into the positioning groove 202. This design can play a role in rapid positioning when the two are joined, ensuring that the first receiving groove 101 and the second receiving groove 201 can be accurately joined, thereby ensuring the positional accuracy of the workpiece 7, so that the workpiece 7 can be clamped more stably, thereby improving the processing accuracy, reducing the instability of the workpiece 7 and processing errors caused by inaccurate joining, and better ensuring the stability of product quality.

[0056] In some examples, the number of positioning protrusions 104 and positioning grooves 202 are equal, and there are at least two of each, with positioning protrusions 104 on both sides of the axis of the positioning disk 3.

[0057] For example, such as Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the arrangement of multiple positioning protrusions 104 and multiple positioning grooves 202, and their distribution on both sides of the axis of the positioning disk 3, enables multiple positioning points to more comprehensively restrict the relative movement of the two during the splicing process, preventing inaccurate splicing due to the failure of a single positioning point. This can further enhance the stability and accuracy of the splicing of the first clamping seat 1 and the second clamping seat 2, reduce the deformation and dimensional deviation of the workpiece 7 caused by unstable clamping, thereby improving the consistency of product quality and reducing the probability of producing defective products.

[0058] In some examples, the positioning disk 3 has a screw hole 303 on its circumferential surface. The screw hole 303 is located on the side of the second clamping seat 2 away from the first clamping seat 1 and communicates with the mounting hole 301. It also includes a tightening bolt 6, which is threadedly connected to the screw hole 303 and contacts the second clamping seat 2 for clamping the second clamping seat 2 between the first clamping seat 1 and the tightening bolt 6.

[0059] For example, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, after the first clamping seat 1 and the second clamping seat 2 are inserted into the mounting holes 301 of the positioning plate 3, the tightening bolt 6 is rotated to apply pressure to the second clamping seat 2, clamping the second clamping seat 2 between the first clamping seat 1 and the tightening bolt 6. This locks the first clamping seat 1 and the second clamping seat 2 into the mounting holes 301 of the positioning plate 3. When disassembly is required, the tightening bolt 6 is separated from the second clamping seat 2, allowing the first clamping seat 1 and the second clamping seat 2 to be removed from the positioning plate 3. During lathe machining, this effectively prevents relative displacement between the first clamping seat 1 and the second clamping seat 2, ensuring the stability of the workpiece 7 clamping, improving machining accuracy, reducing machining errors caused by loose clamping components, improving product quality, and offering a simple structure that is convenient and quick to assemble and disassemble, saving time and effort.

[0060] In some examples, the screw hole 303 is arranged radially along the positioning disk 3 and located at the center of the second clamping seat 2.

[0061] For example, such as Figure 1 , Figure 2 and Figure 3 As shown, this allows the pressure applied by the tightening bolt 6 to act more directly and evenly on the second clamping seat 2, improving the stability and reliability of the connection between the first clamping seat 1 and the second clamping seat 2. This helps maintain the correct position of the workpiece 7 in the receiving cavity, reduces the positional changes of the workpiece 7 caused by uneven force on the second clamping seat 2, thereby improving machining accuracy and better ensuring the stability and consistency of product quality.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A workpiece fixing device, characterized in that, include: The first clamping seat (1) has a first receiving groove (101); The second clamping seat (2) has a second receiving groove (201) which is spliced ​​with the first receiving groove (101) to receive the workpiece (7). The positioning plate (3) has a mounting hole (301) that extends through the thickness direction. The second clamping seat (2) and the first clamping seat (1) are locked together and inserted into the mounting hole (301). The positioning plate (3) is used to clamp onto the fixture of the lathe.

2. The workpiece fixing device according to claim 1, characterized in that, The first clamping seat (1) has a guide groove (102) on the side away from the first receiving groove (101). The length direction of the guide groove (102) is parallel to the axial direction of the positioning disk (3). It also includes a guide protrusion (4). The guide protrusion (4) is disposed in the mounting hole (301). The guide protrusion (4) is inserted into the guide groove (102).

3. The workpiece fixing device according to claim 2, characterized in that, A stop (5) is provided at one end of the positioning disk (3). After the guide protrusion (4) is inserted into the guide groove (102), the stop (5) abuts against the first clamping seat (1) to block the first clamping seat (1).

4. The workpiece fixing device according to claim 3, characterized in that, One end of the positioning disk (3) has a groove (302) communicating with the mounting hole (301), one end of the stop (5) is disposed in the groove (302), and the other end of the stop (5) extends into the mounting hole (301) to block the first clamping seat (1).

5. The workpiece fixing device according to claim 4, characterized in that, The first clamping seat (1) has a slot (103) at the position corresponding to the sink (302), and the stop block (5) engages with the slot (103).

6. The workpiece fixing device according to claim 3, characterized in that, The stop block (5) and the positioning plate (3) are detachably connected.

7. The workpiece fixing device according to claim 1, characterized in that, One of the first clamping seat (1) and the second clamping seat (2) has a positioning groove (202), and the other has a positioning protrusion (104) for insertion into the positioning groove (202). The positioning protrusion (104) and the positioning groove (202) are both located around the workpiece (7).

8. A workpiece fixing device according to claim 7, characterized in that, The number of the positioning protrusions (104) and the positioning grooves (202) are equal, and there are at least two of each. The positioning protrusions (104) are located on both sides of the axis of the positioning disk (3).

9. A workpiece fixing device according to claim 2, characterized in that, The positioning disk (3) has a screw hole (303) on its circumferential surface. The screw hole (303) is located on the side of the second clamping seat (2) away from the first clamping seat (1) and communicates with the mounting hole (301). It also includes a tightening bolt (6), which is threadedly connected to the screw hole (303) and contacts the second clamping seat (2) to clamp the second clamping seat (2) between the first clamping seat (1) and the tightening bolt (6).

10. A workpiece fixing device according to claim 9, characterized in that, The screw hole (303) is arranged radially along the positioning disk (3) and is located at the center of the second clamping seat (2).

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