Numerical control machine tool and trial cutting piece clamp thereof

Abstract

The utility model provides a numerical control machine tool and a trial cutting piece clamp thereof. The trial cutting piece clamp comprises a mounting seat and a clamping mechanism. Force is applied to the two clamping rods to enable the two clamping rods to move away from each other, the two clamping rods move away from each other to drive the two first sliding blocks to move away from each other, the two first sliding blocks move away from each other to enable the two springs to be compressed and shrunk, then a trial cutting piece is placed between the two clamping blocks, and then the force applied to the two clamping rods is cancelled. At the moment, the reacting force of two groups of springs can enable two groups of first sliding blocks to drive two groups of clamping rods to move relatively close to each other, so that the two groups of clamping blocks are used for clamping the trial cutting pieces; the rotating shaft is rotated to drive the two clamping rods to move close to or away from each other through the transmission assembly, so that the initial distance between the two clamping rods can be reduced or increased, the two clamping rods can be conveniently adjusted at the same time, the initial distance between the two clamping rods is conveniently adjusted, and the machining efficiency of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to a numerical control machine tool and a trial cutting fixture thereof. Background Art

[0002] CNC machine tool is the abbreviation of digitally controlled machine tool. It is an automated machine tool equipped with a program control system. Its basic components include processing program carrier, CNC device, servo drive device, machine tool body and other auxiliary devices. It has the characteristics of high precision, high efficiency and high flexibility, and is widely used in various industrial fields.

[0003] A CNC machine tool test-cut fixture is a device used to clamp test-cut pieces and guide cutting tools on CNC machine tools. The design and use of this type of fixture is crucial to ensuring the machining accuracy and production efficiency of test-cut pieces. Most existing CNC machine tool test-cut fixtures have a simple structure. When clamping test-cut pieces of different sizes, in order to ensure that the test-cut pieces are located in the middle of the fixture, the positions of the two sets of clamping rods need to be adjusted separately to adjust the initial spacing between the two sets of clamping rods. This adjustment is relatively cumbersome and reduces the machining efficiency of the device. Therefore, in response to the above-mentioned technical problems, a CNC machine tool and a test-cut fixture thereof are proposed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention proposes a CNC machine tool and a trial cutting fixture thereof, which facilitates simultaneous adjustment of two sets of clamping rods, facilitates adjustment of the initial spacing between the two sets of clamping rods, and improves the processing efficiency of the device.

[0005] Test cutting fixture, including:

[0006] A mounting base, one side of which is provided with a first sliding groove, and a cover plate covering the opening of the first sliding groove is fixed to one side of the mounting base by bolts; and

[0007] The clamping mechanism includes a first slider, a spring, a connecting seat, a clamping rod, a clamping block, a rotating shaft and a transmission assembly, wherein the first slider is slidably provided at both ends of the first slide, and the two groups of the first slide blocks are provided with the springs abutting against the two ends of the first slide, and two groups of through grooves connected to the first slide are relatively opened on one side of the cover plate, and one side of the two groups of the connecting seats passes through the two groups of through grooves and is fixed to the two groups of the first slide blocks by bolts, the clamping rods are slidably provided on the two groups of the connecting seats, and the clamping blocks are provided on the opposite sides of the two groups of the clamping rods, and the trial cutting piece is clamped between the two groups of the clamping blocks, the rotating shaft is rotatably provided on the cover plate, and is connected to the two groups of the clamping rods through the transmission assembly. Rotating the rotating shaft can drive the two groups of the clamping rods to move relatively close or away through the transmission assembly.

[0008] The beneficial effects of the above-mentioned CNC machine tool and the test cutting fixture are as follows:

[0009] When clamping the trial cut piece, force is applied to the two sets of clamping rods to make the two sets of clamping rods move relatively apart. The relative movement of the two sets of clamping rods drives the two sets of first sliders to move relatively apart. The relative movement of the two sets of first sliders can compress the two sets of springs and shrink. Then the trial cut piece is placed between the two sets of clamping blocks. When the force applied to the two sets of clamping rods is cancelled, the reaction force of the two sets of springs can make the two sets of first sliders drive the two sets of clamping rods to move relatively close to each other, so that the two sets of clamping blocks clamp the trial cut piece. When it is necessary to clamp trial cut pieces of different sizes, the rotating shaft can be used to drive the two sets of clamping rods to move relatively close to or away from each other through the transmission assembly to reduce or increase the initial spacing of the two sets of clamping rods, which is convenient for adjusting the two sets of clamping rods at the same time. It is convenient to adjust the initial spacing of the two sets of clamping rods, thereby improving the processing efficiency of the device.

[0010] In one embodiment, both sets of the connecting seats are provided with T-shaped slots, and both sets of the clamping rods are provided with T-shaped sliders at one end, and the two sets of T-shaped sliders are slidably disposed in the two sets of the T-shaped slots. The provision of the T-shaped slots and the T-shaped sliders in conjunction with each other can improve the sliding stability of the clamping rods.

[0011] In one embodiment, the transmission assembly includes a screw, a first gear, and a second gear; the two sets of T-shaped slides are each provided with a rotatable screw, the helical lines of the two sets of screws are opposite, and are respectively threadedly connected to the two sets of T-shaped sliders; the opposite ends of the two sets of screws are provided with a coaxial second gear; the first gear is rotatably provided on the two sets of connecting seats, and the first gear on one set of the connecting seats is meshed with the second gear, and the two sets of first gears are respectively slidably mounted on both ends of the rotating shaft along the axial direction of the rotating shaft. By rotating the rotating shaft, the rotation of the rotating shaft drives the two sets of first gears to rotate, and the rotation of the two sets of first gears meshes with the two sets of second gears to drive the two sets of second gears to rotate, and the rotation of the two sets of second gears drives the two sets of screws to rotate, and the rotation of the two sets of screws and the threaded engagement of the two sets of T-shaped sliders can drive the two sets of T-shaped sliders to drive the two sets of clamping rods to move relatively closer, and conversely, by rotating the rotating shaft in the opposite direction, the two sets of clamping rods can be driven to move relatively farther, and the two sets of clamping rods can be driven to move relatively closer or farther.

[0012] In one embodiment, a second sliding groove is provided on both ends of the rotating shaft, a coaxial through hole is provided on the two groups of the first gears, a second slider is provided in the two groups of the through holes, and the two groups of the second sliders are slidably provided in the two groups of the second sliding grooves.

[0013] In one embodiment, the clamping mechanism further includes a pressing member and a connecting rod; a vertically extending guide groove is formed on the top surface of the first slide, and the bottom end of the pressing member slides through the guide groove and is located between the two sets of first sliders. The bottom end of the pressing member is relatively hinged with two sets of connecting rods, and one end of the two sets of connecting rods is respectively hinged to the two sets of first sliders. By pressing the pressing member to move the pressing member downward, the downward movement of the pressing member can drive the two sets of first sliders to move away from each other via the two sets of connecting rods. The relative movement of the two sets of first sliders can drive the two sets of clamping rods to move away from each other via the two sets of connecting seats. Driving the two sets of clamping rods to move away from each other is convenient, making it easy to place the test cutting piece between the two sets of clamping seats.

[0014] In one embodiment, the first chute is open at both ends, and sealing seats are fixed to both ends of the mounting base via bolts to seal the openings of the first chute. The two sets of springs have their opposing ends resting against the two sets of sealing seats, respectively. The springs can be replaced by removing the sealing seats, making spring replacement convenient.

[0015] In one embodiment, the two sets of sealing seats are each provided with a positioning hole at the opposite ends thereof, and the two sets of first sliders are each provided with a positioning shaft at the ends thereof facing away from each other. One end of the two sets of springs is inserted into the positioning hole, and the other end is sleeved on the positioning shaft. The coordination of the positioning hole and the positioning shaft improves the stability of the spring during expansion and contraction.

[0016] In one embodiment, two sets of clamping rods are each provided with two sets of opposing fixing bolts, which are threadedly connected to the clamping block. The clamping block can be removed by rotating the fixing bolts to separate the fixing bolts from the clamping block, facilitating replacement of the clamping block with a suitable size for the desired test piece, thereby improving the practicality of the device.

[0017] In one embodiment, third slots are defined on opposing sides of the two sets of clamping rods, and third sliders are defined on the opposing sides of the two sets of clamping blocks. The two sets of third sliders are configured to slide toward or away from the cover plate within the two sets of third slots. Limiting slots communicating with the third slots are defined on the opposing sides of the two sets of clamping rods, and one end of the fixing bolt passes through the limiting slot and is threadedly connected to the third slider. The position of the clamping block on the clamping rod can be adjusted by loosening or tightening the fixing bolt and sliding it within the limiting slot, thereby increasing the range of the device capable of clamping test pieces of different sizes and further improving the practicality of the device.

[0018] A numerically controlled machine tool comprises any one of the above-mentioned trial cutting fixtures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a test cutting fixture provided in one embodiment of the present utility model;

[0021] Figure 2 for Figure 1 Exploded view of the test-cut fixture shown;

[0022] Figure 3 for Figure 1 An exploded view of the clamping mechanism in the test piece fixture shown;

[0023] Figure 4 for Figure 1 An exploded view of the transmission assembly in the test piece fixture is shown;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of area A in the middle.

[0025] Reference numerals:

[0026] 1. Trial cutting;

[0027] 10. Mounting seat; 101. First slide groove; 102. Cover plate; 1021. Through groove; 103. Guide groove; 104. Sealing seat; 1041. Positioning hole;

[0028] 20. Clamping mechanism; 201. First slider; 2011. Positioning shaft; 202. Spring; 203. Connecting seat; 2031. T-shaped slide; 204. Clamping rod; 2041. T-shaped slider; 2042. Fixing bolt; 2043. Third slide; 2044. Limiting groove; 205. Clamping block; 2051. Third slider; 206. Rotating shaft; 2061. Second slide; 207. Screw; 208. First gear; 2081. Second slider; 209. Second gear.

[0029] 30. Pressing piece; 301. Connecting rod. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0031] See also Figures 1 to 4In one embodiment, a CNC machine tool includes a trial cutting fixture, which includes a mounting seat 10 and a clamping mechanism 20.

[0032] Among them, a first slide groove 101 is opened on one side of the mounting base 10, and a cover plate 102 covering the opening of the first slide groove 101 is fixed to one side of the mounting base 10 by bolts. The clamping mechanism 20 includes a first slider 201, a spring 202, a connecting seat 203, a clamping rod 204, a clamping block 205, a rotating shaft 206 and a transmission assembly. The first sliders 201 are slidably set at both ends of the first slide groove 101. The two groups of first sliders 201 are both provided with springs 202 that abut against the two ends of the first slide groove 101 at the diverging ends. Two groups of through grooves 1021 communicating with the first slide groove 101 are opened on one side of the cover plate 102. The two groups of connecting seats 203 pass through the two sides respectively. The through groove 1021 is fixed to the two groups of first sliders 201 by bolts, and the two groups of connecting seats 203 are slidably provided with clamping rods 204, and the opposite sides of the two groups of clamping rods 204 are provided with clamping blocks 205. The trial cutting piece 1 is clamped between the two groups of clamping blocks 205, and the rotating shaft 206 is rotatably provided on the cover plate 102 and is connected to the two groups of clamping rods 204 through a transmission assembly. The rotating shaft 206 can drive the two groups of clamping rods 204 to move relatively closer or farther away through the transmission assembly.

[0033] In the above embodiment, when clamping the test piece 1, the two sets of clamping rods 204 are forced to move away from each other, and the two sets of clamping rods 204 move away from each other, which drives the two sets of first sliders 201 to move away from each other. The two sets of first sliders 201 move away from each other, which can compress and shrink the two sets of springs 202. Then, the test piece 1 is placed between the two sets of clamping blocks 205. When the force applied to the two sets of clamping rods 204 is canceled, the reaction force of the two sets of springs 202 is released. The two groups of first sliders 201 can drive the two groups of clamping rods 204 to move relatively close to each other, so that the two groups of clamping blocks 205 clamp the test cut piece 1. When it is necessary to clamp the test cut piece 1 of different sizes, the rotating shaft 206 drives the two groups of clamping rods 204 to move relatively close to or away from each other through the transmission component to reduce or increase the initial spacing between the two groups of clamping rods 204, which is convenient for adjusting the two groups of clamping rods 204 at the same time, and the initial spacing between the two groups of clamping rods 204 is convenient to adjust, thereby improving the processing efficiency of the device.

[0034] On the basis of the above embodiment, the clamping mechanism 20 further includes a pressing member 30 and a connecting rod 301; a vertically penetrating guide groove 103 is opened on the top surface of the first slide groove 101, and the bottom end of the pressing member 30 slides through the guide groove 103 and is located between the two groups of first sliders 201. The bottom end of the pressing member 30 is relatively hinged with two groups of connecting rods 301, and one end of the two groups of connecting rods 301 is respectively hinged to the two groups of first sliders 201.

[0035] By pressing the pressing piece 30 to move the pressing piece 30 downward, the downward movement of the pressing piece 30 can drive the two groups of first sliders 201 to move relatively away from each other through the two groups of connecting rods 301. The relative movement of the two groups of first sliders 201 can drive the two groups of clamping rods 204 to move relatively away from each other through the two groups of connecting seats 203. It is convenient to drive the two groups of clamping rods 204 to move relatively away from each other, so that the test cutting piece 1 is placed between the two groups of clamping blocks 205.

[0036] See also Figure 2 、 Figure 4 In one embodiment, both sets of connecting seats 203 are provided with T-shaped slots 2031, and both sets of clamping rods 204 are provided with T-shaped sliders 2041 at one end. The two sets of T-shaped sliders 2041 are slidably disposed in the two sets of T-shaped slots 2031. The T-shaped slots 2031 cooperate with the T-shaped sliders 2041 to improve the sliding stability of the clamping rods 204.

[0037] See also Figure 4 、 Figure 5 In one embodiment, the transmission assembly includes a screw 207, a first gear 208, and a second gear 209. A rotatable screw 207 is disposed within each of the two sets of T-shaped slots 2031. The screws 207 have opposite helical lines and are threadedly connected to the two sets of T-shaped sliders 2041. A coaxial second gear 209 is disposed at the opposite ends of each set of screws 207. A rotatable first gear 208 is disposed on each of the two sets of connecting seats 203. The first gear 208 meshes with the second gear 209 on one set of connecting seats 203. The two sets of first gears 208 are respectively slidably mounted on both ends of the rotating shaft 206 along the axial direction. Specifically, a second slot 2061 is formed on each circumference of the rotating shaft 206. Coaxial through-holes are formed on each of the two sets of first gears 208. A second slider 2081 is disposed in each of the two through-holes. The two sets of second sliders 2081 are slidably disposed within the two sets of second slots 2061.

[0038] In the above embodiment, by rotating the rotating shaft 206, the rotating shaft 206 drives the two groups of first gears 208 to rotate, the two groups of first gears 208 rotate to engage with the two groups of second gears 209 to drive the two groups of second gears 209 to rotate, the two groups of second gears 209 rotate to drive the two groups of screws 207 to rotate, the two groups of screws 207 rotate to engage with the two groups of T-shaped sliders 2041 threads to drive the two groups of T-shaped sliders 2041 to drive the two groups of clamping rods 204 to move relatively close, conversely, by rotating the rotating shaft 206 in the opposite direction, the two groups of clamping rods 204 can be driven to move relatively away, which makes it convenient to drive the two groups of clamping rods 204 to move relatively close or away.

[0039] See also Figure 2 、 Figure 3In one embodiment, the first chute 101 is open at both ends, and sealing seats 104 are fixed to both ends of the mounting base 10 by bolts to seal the openings of the first chute 101. The two sets of springs 202 have their diverging ends against the two sets of sealing seats 104. The springs 202 can be replaced by removing the sealing seats 104, making replacement of the springs 202 convenient.

[0040] In addition to the above embodiment, positioning holes 1041 are formed at opposing ends of the two sets of sealing seats 104, positioning shafts 2011 are provided at the facing ends of the two sets of first sliders 201, and one end of the two sets of springs 202 is inserted into the positioning holes 1041 and the other end is sleeved on the positioning shafts 2011. The cooperation between the positioning holes 1041 and the positioning shafts 2011 improves the stability of the springs 202 during expansion and contraction.

[0041] See also Figure 1 、 Figure 4 In one embodiment, two sets of fixing bolts 2042 are disposed on opposite sides of the two sets of clamping rods 204, and the fixing bolts 2042 are threadedly connected to the clamping blocks 205. Specifically, third sliding grooves 2043 are defined on opposing sides of the two sets of clamping rods 204, and third sliders 2051 are disposed on the opposite sides of the two sets of clamping blocks 205. The two sets of third sliders 2051 are disposed within the two sets of third sliding grooves 2043 so as to be slidable toward or away from the cover plate 102. A limiting groove 2044 is defined on the opposite sides of the two sets of clamping rods 204, which is connected to the third sliding grooves 2043. One end of the fixing bolt 2042 passes through the limiting groove 2044 and is threadedly connected to the third slider 2051.

[0042] In the above embodiment, the clamping block 205 and the clamping rod 204 are detachably arranged, which makes it easy to replace the clamping block 205 with an appropriate size according to the size of the test cutting piece 1 to be clamped, thereby improving the practicality of the device, and the position of the clamping block 205 on the clamping rod 204 can be adjusted by loosening or tightening the fixing bolt 2042 and sliding the fixing bolt 2042 in the limit groove 2044, thereby increasing the range of the device for clamping test cutting pieces 1 of different sizes, thereby further improving the practicality of the device.

[0043] The specific implementation of the above-mentioned CNC machine tool and the test cutting fixture thereof is as follows:

[0044] By pressing the pressing piece 30 to move downward, the pressing piece 30 can be driven downward by the two sets of connecting rods 301 to drive the two sets of first sliders 201 to move relatively away from each other. At this time, the two sets of springs 202 are compressed and contracted, and the two sets of first sliders 201 move relatively away from each other, which can drive the two sets of clamping rods 204 to move relatively away from each other through the two sets of connecting seats 203. Then the test cutting piece 1 is placed between the two sets of clamping blocks 205. When the force applied to the pressing piece 30 is cancelled, the reaction force of the two sets of springs 202 causes the two sets of first sliders 201 to move relatively close to each other. The two sets of first sliders 201 move relatively close to each other, which can drive the two sets of clamping rods 204 to move relatively close to each other through the two sets of connecting seats 203, so that the two sets of clamping blocks 205 clamp the test cutting piece 1, which is convenient for clamping the test cutting piece 1.

[0045] When it is necessary to clamp the trial cutting pieces 1 of different sizes, the rotating shaft 206 is rotated, and the rotating shaft 206 drives the two sets of first gears 208 to rotate. The two sets of first gears 208 rotate to engage with the two sets of second gears 209 to drive the two sets of second gears 209 to rotate. The two sets of second gears 209 rotate to drive the two sets of screws 207 to rotate. The two sets of screws 207 rotate to engage with the two sets of T-shaped sliders 2041 threads to drive the two sets of T-shaped sliders 2041 to drive the two sets of clamping rods 204 to move relatively close. Conversely, by rotating the rotating shaft 206 in the opposite direction, the two sets of clamping rods 204 can be driven to move relatively away from each other. It is convenient to drive the two sets of clamping rods 204 to move relatively close or away. By driving the two sets of clamping rods 204 to move relatively close or away, the initial spacing between the two sets of clamping rods 204 can be reduced or increased. It is convenient to adjust the initial spacing between the two sets of clamping rods 204, thereby improving the processing efficiency of the device.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. Trial cutting fixture, characterized by: include: A mounting seat (10) is provided with a first sliding groove (101) on one side, and a cover plate (102) covering the opening of the first sliding groove (101) is fixed to one side of the mounting seat (10) by bolts; and The clamping mechanism (20) comprises a first slider (201), a spring (202), a connecting seat (203), a clamping rod (204), a clamping block (205), a rotating shaft (206) and a transmission assembly. The first sliders (201) are slidably provided at both ends of the first slide groove (101). The two groups of the first sliders (201) are provided with the springs (202) that abut against the two ends of the first slide groove (101). Two groups of through grooves (1021) communicating with the first slide groove (101) are provided on one side of the cover plate (102). One side of the two groups of the connecting seats (203) passes through the two groups of the The through groove (1021) is fixed to the two groups of the first sliding blocks (201) by bolts, the clamping rods (204) are slidably arranged on the two groups of the connecting seats (203), the clamping blocks (205) are arranged on the opposite sides of the two groups of the clamping rods (204), and the test cutting piece (1) is clamped between the two groups of the clamping blocks (205), the rotating shaft (206) is rotatably arranged on the cover plate (102), and is connected to the two groups of the clamping rods (204) through the transmission assembly, and the rotating shaft (206) can drive the two groups of the clamping rods (204) to move relatively closer or farther away through the transmission assembly.

2. The test cutting fixture according to claim 1, characterized in that: The two groups of connecting seats (203) are both provided with T-shaped sliding grooves (2031), and one end of the two groups of clamping rods (204) is both provided with T-shaped sliding blocks (2041), and the two groups of T-shaped sliding blocks (2041) are slidably arranged in the two groups of T-shaped sliding grooves (2031).

3. The test cutting fixture according to claim 2, characterized in that: The transmission assembly includes a screw (207), a first gear (208) and a second gear (209); the two groups of T-shaped slide grooves (2031) are each provided with a rotatable screw (207), the helical lines of the two groups of screws (207) are opposite, and are respectively threadedly connected to the two groups of T-shaped sliders (2041), the opposite ends of the two groups of screws (207) are each provided with a coaxial second gear (209), the two groups of connecting seats (203) are both rotatably provided with the first gear (208), the first gear (208) on one group of connecting seats (203) is engaged with the second gear (209), and the two groups of the first gears (208) are respectively slidable along the axial direction of the rotating shaft (206) and are sleeved on both ends of the rotating shaft (206).

4. The test cutting fixture according to claim 3, characterized in that: Second sliding grooves (2061) are provided on both ends of the rotating shaft (206), coaxial through holes are provided on the two groups of the first gears (208), second sliders (2081) are provided in the two groups of the through holes, and the two groups of the second sliders (2081) are slidably provided in the two groups of the second sliding grooves (2061).

5. The test cutting fixture according to claim 1, characterized in that: The clamping mechanism (20) further includes a pressing member (30) and a connecting rod (301); a vertically penetrating guide groove (103) is provided on the top surface of the first slide groove (101); the bottom end of the pressing member (30) is slidably arranged in the guide groove (103) and is located between the two groups of the first sliders (201); the bottom end of the pressing member (30) is relatively hinged with two groups of the connecting rods (301), and one end of the two groups of the connecting rods (301) is respectively hinged to the two groups of the first sliders (201).

6. The test cutting fixture according to claim 1, characterized in that: Both ends of the first slide groove (101) are open, and both ends of the mounting seat (10) are fixed with sealing seats (104) by bolts to seal the openings at both ends of the first slide groove (101), and the diverging ends of the two groups of springs (202) respectively abut against the two groups of sealing seats (104).

7. The test cutting fixture according to claim 6, characterized in that: Positioning holes (1041) are provided at the opposite ends of the two groups of sealing seats (104), and positioning shafts (2011) are provided at the away ends of the two groups of first sliders (201). One end of the two groups of springs (202) is inserted into the positioning hole (1041), and the other end is sleeved on the positioning shaft (2011).

8. The test cutting fixture according to claim 1, characterized in that: Two sets of fixing bolts (2042) are arranged opposite to each other on the two sets of clamping rods (204), and the fixing bolts (2042) are threadedly connected to the clamping blocks (205).

9. The test cutting fixture according to claim 8, characterized in that: The two groups of clamping rods (204) are provided with a third sliding groove (2043) on the opposite sides, and the two groups of clamping blocks (205) are provided with a third slider (2051) on the away sides. The two groups of third sliders (2051) can slide close to or away from the cover plate (102) and are arranged in the two groups of third sliding grooves (2043). The two groups of clamping rods (204) are provided with a limiting groove (2044) connected to the third sliding groove (2043) on the away sides. One end of the fixing bolt (2042) passes through the limiting groove (2044) and is threadedly connected to the third slider (2051).

10. A CNC machine tool, characterized in that: The invention comprises a test cutting piece fixture as described in any one of claims 1 to 9.

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