A machining clamp for processing circular arc groove by numerical control milling machine

Abstract

The utility model discloses a kind of machining clamps for machining arc slot of numerical control milling machine, including bottom plate, support plate, first positioning plate and compression assembly, bottom plate is used to install on the machining platform of numerical control milling machine;Support plate is obliquely arranged on bottom plate, for the bottom surface of plate-shaped workpiece, to make the top surface of plate-shaped workpiece and the radial surface of the machining cutter of numerical control milling machine offset;First positioning plate is used to position the lower side of plate-shaped workpiece along the oblique direction of support plate;Compression assembly is located above the oblique direction of first positioning plate along support plate, for compressing the upper side of plate-shaped workpiece along the oblique direction of support plate.The utility model of a kind of machining clamps for machining arc slot of numerical control milling machine, can be through the oblique angle of positioning plate-shaped workpiece, reach the purpose of using ordinary milling cutter in plate-shaped workpiece plane machining arc slot, reduce the limitation of tool in plate-shaped workpiece plane machining arc slot, reduce processing cost and tool procurement difficulty.

Description

Technical Field

[0001] This utility model relates to the technical field of fixtures, and in particular to a machining fixture for machining arc grooves on a CNC milling machine. Background Technology

[0002] In related technologies, such as Figure 1 In CNC milling, the machining of the arc groove 110 on the plane of the plate workpiece 100 generally requires the use of special tools, namely milling cutters with arc-shaped cutting edges. The special cutting edge shape of the special tool is used to machine the arc groove 110 on the plane of the plate workpiece 100.

[0003] However, the existing machining method for machining the arc groove 110 on the plane of the plate-shaped workpiece 100 has great limitations on the cutting tools, resulting in high machining costs and difficulties in procuring cutting tools. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a machining fixture for machining arc grooves on a CNC milling machine. By positioning the tilt angle of a plate-shaped workpiece, it achieves the purpose of machining arc grooves on the plane of the plate-shaped workpiece using a conventional milling cutter, reducing the limitations on cutting tools when machining arc grooves on the plane of a plate-shaped workpiece, and lowering machining costs and the difficulty of procuring cutting tools.

[0005] A machining fixture for machining arc grooves on a CNC milling machine according to an embodiment of the present invention includes: Base plate, used for mounting on the machining platform of a CNC milling machine; A support plate is inclinedly disposed on the base plate to support the bottom surface of the plate-shaped workpiece, so that the top surface of the plate-shaped workpiece is offset from the radial surface of the machining tool of the CNC milling machine. A first positioning plate is disposed on the support plate and is used to position the lower side of the plate-shaped workpiece along the inclined direction of the support plate. A clamping assembly is disposed on the support plate, located above the first positioning plate along the inclined direction of the support plate, for clamping the upper side of the plate-shaped workpiece along the inclined direction of the support plate.

[0006] A machining fixture for machining arc grooves on a CNC milling machine according to an embodiment of the present invention has at least the following beneficial effects: 1. This utility model, through the design of the inclined support plate, makes the machining surface of the plate-shaped workpiece form an offset angle with the radial surface of the machining tool, allowing the use of a standard flat end mill to replace a special arc end mill for arc groove machining. The arc edge of the cutting edge of the standard flat end mill is used to machine the arc groove on the machining surface of the plate-shaped workpiece, which significantly reduces the cost of tools and the difficulty of procurement.

[0007] 2. By setting a first positioning plate and a clamping assembly, the present invention ensures that the plate-shaped workpiece is stably fixed in the tilting direction, which improves the processing accuracy and safety, reduces the risk of displacement of the plate-shaped workpiece, and is conducive to achieving efficient mass production.

[0008] According to some embodiments of the present invention, the clamping assembly includes a fixed seat, a top block, and a first screw. The fixed seat is fixed to the support plate, the first screw is parallel to the support plate and threadedly connected to the fixed seat, the top block is rotatably connected to the first screw, and the first screw rotates to drive the top block to clamp and loosen the plate-shaped workpiece.

[0009] The advantage of this invention is that by adopting a threaded transmission mechanism with the first screw and the fixed seat threadedly engaged, it provides simple and reliable clamping force control, ensuring that the plate-shaped workpiece is firmly clamped onto the support plate and preventing loosening during processing.

[0010] According to some embodiments of the present invention, the support plate is hinged to the base plate, and an adjustment mechanism for adjusting the tilt angle of the support plate is provided between the support plate and the base plate.

[0011] The advantages of this invention are: by hinged to the support plate and the base plate and setting an adjustment mechanism, the tilt angle of the support plate can be flexibly adjusted according to the processing requirements of different arc grooves, which enhances the versatility and adaptability of the fixture, so that the same fixture can be used for processing a variety of workpieces, reducing the frequency of fixture replacement, and improving production efficiency and equipment utilization.

[0012] According to some embodiments of the present invention, the adjusting mechanism includes an adjusting plate and an adjusting bolt. The adjusting bolt is threadedly connected to the support plate. The adjusting plate is fixed to the base plate. The adjusting plate is provided with an arc-shaped groove that extends axially through the adjusting plate along the hinge center of the support plate and the base plate. The arc-shaped groove extends circumferentially along the axis of the hinge center of the support plate and the base plate. The arc-shaped groove accommodates the adjusting bolt to move along the extension direction of the arc-shaped groove. The adjusting bolt can lock and loosen the adjusting plate.

[0013] The advantages of this invention are: by setting an arc groove on the adjusting plate, the arc groove allows the adjusting bolt to move smoothly within a predetermined range, thereby achieving fine adjustment and precise fixing of the tilt angle of the support plate. The locking function of the locking bolt on the adjusting plate ensures the stability of the angle during processing and prevents angle changes caused by vibration or external force, thereby improving processing accuracy and repeatability.

[0014] According to some embodiments of the present invention, the adjustment plate is provided with an angle scale, the angle scale is coaxially arranged with the hinge center of the support plate and the base plate, the support plate is provided with a pointer, the pointer is arranged radially along the hinge center of the support plate and the base plate, and the pointer points to the angle scale to indicate the tilt angle of the support plate.

[0015] The advantages are: by setting angle scales and pointers on the adjustment plate and support plate respectively, this utility model provides an intuitive angle display, enabling the operator to quickly and accurately set the required tilt angle, reducing debugging time and human error.

[0016] According to some embodiments of the present invention, the support plate is hinged to the base plate, and a driving mechanism is further provided between the base plate and the support plate, the driving mechanism being used to drive the support plate to swing up and down.

[0017] The advantages are: this utility model realizes the mechanical swing of the support plate through the drive mechanism, which replaces the manual swing adjustment of the support plate, improves the efficiency and accuracy of angle adjustment, and reduces the labor intensity of the operator.

[0018] According to some embodiments of this utility model, the driving mechanism includes two mutually hinged first connecting rods, two mutually hinged second connecting rods, and a second screw. One first connecting rod and one second connecting rod are coaxially hinged to the base plate, and the other first connecting rod and the other second connecting rod are coaxially hinged to the support plate. A first seat is provided at the hinge center of the two first connecting rods, and a second seat is provided at the hinge center of the two second connecting rods. The second screw is rotatably connected to the first seat and threadedly connected to the second seat. The rotation of the second screw drives the first seat and the second seat to move closer and further away from each other, so that the support plate swings closer and further away from the base plate.

[0019] The advantages are: this utility model provides a smooth and reliable transmission through the cooperation of the connecting rod and the second screw, ensuring that the swinging process of the support plate is smooth and precise. In addition, it makes the drive mechanism have a self-locking characteristic, preventing the support plate from moving accidentally during processing. At the same time, the transmission efficiency is high and easy to control, improving the stability and service life of the fixture. Moreover, through the cooperation of the first connecting rod, the second connecting rod, the first seat and the second seat, the length direction of the second screw can be set along the radial direction of the base plate and the support plate, avoiding the second screw from interfering with the machining platform or cutting tool of the CNC milling machine.

[0020] According to some embodiments of the present invention, the first seat is located on the side of the second seat near the hinge center of the support plate and the base plate, one end of the second screw is rotatably connected to the first seat, and the other end of the second screw extends outward through the second seat.

[0021] The advantages of this invention are: by placing the first seat on the side of the second seat near the hinge center of the support plate and the base plate, with one end of the second screw rotatably connected to the first seat and the other end of the second screw extending outward through the second seat, the layout of the drive mechanism is optimized, making the structure more compact and reducing space occupation. At the same time, the through-hole design of the second screw makes it easy for the operator to rotate the second screw from the radially outer side of the hinge center of the support plate and the base plate, which is beneficial to optimizing the operating space.

[0022] According to some embodiments of the present invention, a handwheel is provided at the end of the second screw away from the first seat.

[0023] The advantages are: This utility model provides a user-friendly operating interface through the handwheel, allowing the operator to easily rotate the second screw without tools, thereby achieving rapid adjustment of the support plate and improving the convenience and efficiency of operation.

[0024] According to some embodiments of the present invention, a second positioning plate is further provided on the support plate, the second positioning plate being used to position the side adjacent to the upper and lower sides of the plate-shaped workpiece.

[0025] The advantages are: by setting a second positioning plate, this utility model increases the positioning points for the plate-shaped workpiece, ensuring that the plate-shaped workpiece is accurately aligned in multiple directions and preventing the plate-shaped workpiece from rotating or shifting during the clamping process.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the plate-shaped workpiece according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a machining fixture for machining arc grooves on a CNC milling machine, according to an embodiment of the present invention. Figure 3 for Figure 2 A structural schematic diagram from another perspective is shown; Figure 4 for Figure 2 The side view shown.

[0029] Reference numerals: 100-plate-shaped workpiece, 110-arc groove, 120-base plate, 130-support plate, 140-first positioning plate, 150-clamping assembly, 160-fixed seat, 170-top block, 180-first screw, 190-adjusting mechanism, 200-adjusting plate, 210-adjusting bolt, 220-arc groove, 230-angle scale, 240-pointer, 250-drive mechanism, 260-first connecting rod, 270-second connecting rod, 280-second screw, 290-first seat, 300-second seat, 310-handwheel, 320-second positioning plate. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following description, in conjunction with the accompanying drawings, describes a machining fixture for machining arc grooves on a CNC milling machine according to an embodiment of the present invention.

[0035] The present invention aims to provide an embodiment of a machining fixture for machining arc grooves on a CNC milling machine.

[0036] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, a machining fixture for machining arc grooves on a CNC milling machine mainly includes a base plate 120, a support plate 130, a first positioning plate 140, and a clamping assembly 150.

[0037] The base plate 120 is used to be mounted on the machining platform of a CNC milling machine.

[0038] Specifically, the base plate 120 can be fixed to the processing platform with bolts.

[0039] The support plate 130 is inclinedly disposed on the base plate 120. The support plate 130 is used to support the bottom surface of the plate-shaped workpiece 100 so that the top surface of the plate-shaped workpiece 100 is offset from the radial surface of the machining tool of the CNC milling machine.

[0040] It is understood that, through the design of the inclined support plate 130, this embodiment makes the machining surface of the plate workpiece 100 and the radial surface of the machining tool form an offset angle, allowing the use of a standard flat end mill to replace the special arc end mill for machining the arc groove 110. The arc groove 110 is machined on the machining surface of the plate workpiece 100 by using the arc edge of the cutting edge of the standard flat end mill, which significantly reduces the cost of the tool and the difficulty of procurement.

[0041] The first positioning plate 140 is disposed on the support plate 130 and is used to position the lower side of the plate-shaped workpiece 100 along the inclined direction of the support plate 130.

[0042] The clamping assembly 150 is disposed on the support plate 130. The clamping assembly 150 is located above the first positioning plate 140 along the inclined direction of the support plate 130. The clamping assembly 150 is used to clamp the upper side of the plate-shaped workpiece 100 along the inclined direction of the support plate 130.

[0043] It is understood that by setting the first positioning plate 140 and the clamping component 150, the first positioning plate 140 and the clamping component 150 together ensure that the plate-shaped workpiece 100 is stably fixed in the tilting direction, which improves the processing accuracy and safety, reduces the risk of displacement of the plate-shaped workpiece 100, and is conducive to achieving efficient mass production.

[0044] In some specific embodiments, the clamping assembly 150 includes a fixed base 160, a top block 170, and a first screw 180. The fixed base 160 is fixed on the support plate 130. The first screw 180 is parallel to the support plate 130 and threadedly connected to the fixed base 160. The top block 170 is rotatably connected to the first screw 180. The first screw 180 rotates to drive the top block 170 to clamp and loosen the plate-shaped workpiece 100.

[0045] It is understood that this embodiment provides a simple and reliable clamping force control by adopting a threaded transmission mechanism with the first screw 180 and the fixed seat 160 threadedly engaged, ensuring that the plate-shaped workpiece 100 is firmly clamped on the support plate 130 and preventing loosening during processing.

[0046] Furthermore, the top block 170 is slidably connected to the support plate 130.

[0047] Specifically, the support plate 130 is provided with at least two sliding grooves, and the bottom of the top block 170 is provided with at least two protrusions, which cooperate with the sliding grooves to slide.

[0048] In some specific embodiments, the support plate 130 is hinged to the base plate 120, and an adjustment mechanism 190 for adjusting the tilt angle of the support plate 130 is provided between the support plate 130 and the base plate 120.

[0049] It is understood that by hinged support plate 130 to base plate 120 and setting adjustment mechanism 190, this embodiment allows the tilt angle of support plate 130 to be flexibly adjusted according to the processing requirements of different arc grooves 110, which enhances the versatility and adaptability of the fixture, so that the same fixture can be used for processing a variety of workpieces, reducing the frequency of fixture replacement, and improving production efficiency and equipment utilization.

[0050] Specifically, the adjustment mechanism 190 includes an adjustment plate 200 and an adjustment bolt 210. The adjustment bolt 210 is threadedly connected to the support plate 130. The adjustment plate 200 is fixed on the base plate 120. The adjustment plate 200 is provided with an arc-shaped groove 220 that extends axially through the adjustment plate 200 along the hinge center of the support plate 130 and the base plate 120. The arc-shaped groove 220 extends circumferentially along the axis of the hinge center of the support plate 130 and the base plate 120. The arc-shaped groove 220 accommodates the adjustment bolt 210, which moves along the extension direction of the arc-shaped groove 220. The adjustment bolt 210 can lock and loosen the adjustment plate 200.

[0051] It is understood that in this embodiment, by setting an arc groove 220 in the adjusting plate 200, the arc groove 220 allows the adjusting bolt 210 to move smoothly within a predetermined range, thereby achieving fine adjustment and precise fixation of the tilt angle of the support plate 130. The locking function of the locking bolt on the adjusting plate 200 ensures the stability of the angle during processing and prevents angle changes caused by vibration or external force, thereby improving processing accuracy and repeatability.

[0052] In some specific embodiments, the adjustment plate 200 is provided with an angle scale 230, which is coaxially arranged with the hinge center of the support plate 130 and the base plate 120. The support plate 130 is provided with a pointer 240, which is arranged radially along the hinge center of the support plate 130 and the base plate 120. The pointer 240 points to the angle scale 230 to indicate the tilt angle of the support plate 130.

[0053] It is understood that this embodiment provides an intuitive angle display by setting an angle scale 230 and a pointer 240 on the adjustment plate 200 and the support plate 130 respectively, enabling the operator to quickly and accurately set the required tilt angle, reducing debugging time and human error.

[0054] In some specific embodiments, the support plate 130 is hinged to the base plate 120, and a drive mechanism 250 is also provided between the base plate 120 and the support plate 130. The drive mechanism 250 is used to drive the support plate 130 to swing up and down.

[0055] It is understood that in this embodiment, the mechanical swing of the support plate 130 is achieved through the drive mechanism 250, which replaces the manual swing adjustment of the support plate 130, improves the efficiency and accuracy of angle adjustment, and reduces the labor intensity of the operator.

[0056] Specifically, the drive mechanism 250 includes two hinged first links 260, two hinged second links 270, and a second screw 280. One first link 260 and one second link 270 are coaxially hinged to the base plate 120, and the other first link 260 and the other second link 270 are coaxially hinged to the support plate 130. A first seat 290 is provided at the hinge center of the two first links 260, and a second seat 300 is provided at the hinge center of the two second links 270. The second screw 280 is rotatably connected to the first seat 290 and threadedly connected to the second seat 300. The rotation of the second screw 280 causes the first seat 290 and the second seat 300 to move closer to and further away from each other, so that the support plate 130 swings closer to and further away from the base plate 120.

[0057] It is understood that this embodiment provides a smooth and reliable transmission through the cooperation of the connecting rod and the second screw 280, ensuring that the swinging process of the support plate 130 is smooth and precise. In addition, it enables the drive mechanism 250 to have a self-locking characteristic, preventing the support plate 130 from moving accidentally during the processing. At the same time, the transmission efficiency is high and easy to control, improving the stability and service life of the fixture. Moreover, through the cooperation of the first connecting rod 260, the second connecting rod 270, the first seat 290 and the second seat 300, the length direction of the second screw 280 can be arranged radially along the base plate 120 and the support plate 130, avoiding the second screw 280 from interfering with the machining platform or tool of the CNC milling machine.

[0058] Furthermore, the first seat 290 is located on the side of the second seat 300 near the hinge center of the support plate 130 and the base plate 120. One end of the second screw 280 is rotatably connected to the first seat 290, and the other end of the second screw 280 extends outward through the second seat 300. This optimizes the layout of the drive mechanism 250, making the structure more compact and reducing space occupation. At the same time, the through-hole design of the second screw 280 facilitates the operator to rotate the second screw 280 from the second seat 300 along the radially outer side of the hinge center of the support plate 130 and the base plate 120, which helps to optimize the operating space.

[0059] In some specific embodiments, a handwheel 310 is provided at the end of the second screw 280 away from the first seat 290.

[0060] It is understood that this embodiment provides a user-friendly operating interface through the handwheel 310, allowing the operator to easily rotate the second screw 280 without tools, thereby achieving rapid adjustment of the support plate 130 and improving the convenience and efficiency of operation.

[0061] In some specific embodiments, a second positioning plate 320 is also provided on the support plate 130. The second positioning plate 320 is used to position the side of the plate-shaped workpiece 100 that is adjacent to the lower side.

[0062] It is understood that by setting the second positioning plate 320, this embodiment increases the positioning points of the plate-shaped workpiece 100, ensuring that the plate-shaped workpiece 100 is accurately aligned in multiple directions and preventing the plate-shaped workpiece 100 from rotating or shifting during the clamping process.

[0063] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The terms "first," "second," "third," "fourth," etc. (if applicable) in the specification, claims, and accompanying drawings of this application 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 so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.

[0065] It should also be noted that, in the description of this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0066] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may also include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatus.

[0067] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A machining fixture for machining arc grooves on a CNC milling machine, characterized in that, include: The base plate (120) is used to be mounted on the machining platform of a CNC milling machine; A support plate (130) is inclinedly disposed on the base plate (120) to support the bottom surface of the plate-shaped workpiece (100) so that the top surface of the plate-shaped workpiece (100) is offset from the radial surface of the machining tool of the CNC milling machine. A first positioning plate (140) is disposed on the support plate (130) for positioning the lower side of the plate-shaped workpiece (100) along the inclined direction of the support plate (130); A clamping assembly (150) is disposed on the support plate (130) and located above the first positioning plate (140) along the inclined direction of the support plate (130), for clamping the upper side of the plate-shaped workpiece (100) along the inclined direction of the support plate (130).

2. A machining fixture for machining arc grooves on a CNC milling machine according to claim 1, characterized in that, The clamping assembly (150) includes a fixed seat (160), a top block (170), and a first screw (180). The fixed seat (160) is fixed on the support plate (130). The first screw (180) is parallel to the support plate (130) and threadedly connected to the fixed seat (160). The top block (170) is rotatably connected to the first screw (180). The first screw (180) rotates to drive the top block (170) to clamp and release the plate-shaped workpiece (100).

3. A machining fixture for machining arc grooves on a CNC milling machine according to claim 1, characterized in that, The support plate (130) is hinged to the base plate (120), and an adjustment mechanism (190) for adjusting the tilt angle of the support plate (130) is provided between the support plate (130) and the base plate (120).

4. A machining fixture for machining arc grooves on a CNC milling machine according to claim 3, characterized in that, The adjustment mechanism (190) includes an adjustment plate (200) and an adjustment bolt (210). The adjustment bolt (210) is threadedly connected to the support plate (130). The adjustment plate (200) is fixed on the base plate (120). The adjustment plate (200) is provided with an arc-shaped groove (220) that passes through the adjustment plate (200) along the axial direction of the hinge center of the support plate (130) and the base plate (120). The arc-shaped groove (220) extends circumferentially along the axis of the hinge center of the support plate (130) and the base plate (120). The arc-shaped groove (220) accommodates the adjustment bolt (210) to move along the extension direction of the arc-shaped groove (220). The adjustment bolt (210) can lock and loosen the adjustment plate (200).

5. A machining fixture for machining arc grooves on a CNC milling machine according to claim 4, characterized in that, An angle scale (230) is provided on the adjustment plate (200). The angle scale (230) is coaxially arranged with the hinge center of the support plate (130) and the base plate (120). The support plate (130) is provided with a pointer (240). The pointer (240) is arranged radially along the hinge center of the support plate (130) and the base plate (120). The pointer (240) points to the angle scale (230) to indicate the tilt angle of the support plate (130).

6. A machining fixture for machining arc grooves on a CNC milling machine according to claim 1 or 4, characterized in that, The support plate (130) is hinged to the base plate (120), and a drive mechanism (250) is provided between the base plate (120) and the support plate (130). The drive mechanism (250) is used to drive the support plate (130) to swing up and down.

7. A machining fixture for machining arc grooves on a CNC milling machine according to claim 6, characterized in that, The drive mechanism (250) includes two hinged first links (260), two hinged second links (270), and a second screw (280). One first link (260), one second link (270), and the base plate (120) are coaxially hinged. The other first link (260), the other second link (270), and the support plate (130) are coaxially hinged. A first seat (290) is hinged to the hinge center of the two first links (260), and a second seat (300) is hinged to the hinge center of the two second links (270). The second screw (280) is rotatably connected to the first seat (290) and threadedly connected to the second seat (300). The rotation of the second screw (280) causes the first seat (290) and the second seat (300) to move closer to and away from each other, so that the support plate (130) swings closer to and away from the base plate (120).

8. A machining fixture for machining arc grooves on a CNC milling machine according to claim 7, characterized in that, The first seat (290) is located on the side of the second seat (300) near the hinge center of the support plate (130) and the base plate (120). One end of the second screw (280) is rotatably connected to the first seat (290), and the other end of the second screw (280) extends outward through the second seat (300).

9. A machining fixture for machining arc grooves on a CNC milling machine according to claim 8, characterized in that, A handwheel (310) is provided at the end of the second screw (280) away from the first seat (290).

10. A machining fixture for machining arc grooves on a CNC milling machine according to claim 1, characterized in that, The support plate (130) is also provided with a second positioning plate (320), which is used to position the side of the plate-shaped workpiece (100) adjacent to the lower side.

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