Universal fixture and clamping method for small five-axis machining center

Abstract

The present invention discloses a universal clamp for a small five-axis machining center and a clamping method thereof, comprising a base, a first clamping block and a second clamping block located at the right end of the base and movable back and forth along the longitudinal direction of the base, a third clamping block located at the left end of the base and movable back and forth along the transverse direction of the base, a longitudinal positioning assembly for driving the first clamping block and the second clamping block to move back and forth along the longitudinal direction of the base, a transverse positioning assembly for driving the third clamping block to move back and forth along the transverse direction of the base, a first hook-shaped pressing block hinged at the middle part above the first clamping block, a second hook-shaped pressing block hinged at the middle part above the second clamping block, a pair of third hook-shaped pressing blocks hinged symmetrically above the third clamping block, a first clamping assembly, a second clamping assembly, and a third clamping assembly. The present invention realizes clamping and positioning through the first and second clamping blocks that can be adjusted longitudinally and the third clamping block that can be adjusted transversely, which is convenient for clamping parts of different sizes and types, and has a wider range of applications.

Description

Technical Field

[0001] The invention relates to a quick clamping device, in particular to a universal clamp for a small five-axis machining center. Background Art

[0002] The machining center is a CNC programmable mechanical processing equipment. When using a five-axis machining center to cut plate parts, a fixture is needed to position the workpiece. The fixture is a device used to conveniently install the workpiece during the process. Due to the limited internal space of the machine tool, it is about 240mm*550mm*770mm; the spindle stroke is small, and traditional fixtures (flat-nose pliers, etc.) are usually too large and prone to tool collision. The height of the fixture must not be greater than 45mm. If the fixture is designed directly using the proportional reduction method, the tool can only have a processing depth of 10 to 20mm, otherwise it is easy to collide with the tool; for a five-axis machining center, the thickness of the workpiece it processes may be uneven, and the clamping needs to be adjusted according to the thickness of the workpiece during the processing. Most of the existing fixtures need to tighten the bolts and use a pressure block to press the workpiece. There are problems such as frequent adjustment of the clamping thickness when processing workpieces of different thicknesses, complex operation, and inconvenient placement of parts. A dynamometer is also installed on the workbench of the small five-axis machining center. Since the stroke of the machining center spindle is small, the center height of the workbench cannot be changed, and the dynamometer further limits the spindle stroke range; therefore, the height of the fixture must be limited to within 4 cm to meet the processing conditions.

[0003] Therefore, it is urgent to solve the above problems. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a universal fixture for a small five-axis machining center that is convenient for clamping different types of workpieces in a narrow space.

[0005] Technical solution: To achieve the above objectives, the present invention discloses a universal fixture for a small five-axis machining center, comprising:

[0006] Base,

[0007] The first clamping block and the second clamping block are located at the right end of the base and can move back and forth along the longitudinal direction of the base and are arranged in parallel.

[0008] A third clamping block is located at the left end of the base, can move back and forth laterally along the base, and cooperates with the first clamping block and the second clamping block to clamp the workpiece.

[0009] A longitudinal positioning assembly for respectively driving the first clamping block and the second clamping block to move back and forth longitudinally along the base,

[0010] A lateral positioning assembly for driving the third clamping block to move back and forth laterally along the base,

[0011] A first hook-shaped pressing block is hinged at the middle part above the first clamping block and is used to press the workpiece.

[0012] The middle part of the second hook-shaped pressing block is hinged above the second clamping block and is used to press the workpiece.

[0013] A pair of third hook-shaped pressing blocks symmetrically hinged above the third clamping block and used to press the workpiece,

[0014] A first pressing assembly for adjusting the pressing state of the first hook-shaped pressing block,

[0015] A second pressing assembly for adjusting the pressing state of the second hook-shaped pressing block,

[0016] And a third pressing assembly for synchronously adjusting the pressing state of the two third hook-shaped pressing blocks.

[0017] Among them, the longitudinal positioning component includes:

[0018] A first threaded rod and a second threaded rod are arranged in parallel front and back and pass through the first clamping block and the second clamping block in sequence,

[0019] Both ends of the first threaded rod and the second threaded rod are connected to the base through a first sleeve.

[0020] The first threaded rod passes through the threaded hole of the first clamping block and the light hole of the second clamping block in sequence.

[0021] The second threaded rod passes through the optical hole of the first clamping block and the threaded hole of the second clamping block in sequence.

[0022] Preferably, the lateral positioning assembly includes a positioning screw rod that is transversely arranged on the base and connected to the base at both ends. The third clamping block is threadedly connected to the positioning screw rod. By rotating the positioning screw rod, the third clamping block can move back and forth laterally along the base.

[0023] Furthermore, a first positioning block with an adjustable positioning screw stroke is provided at the right end of the base, a first positioning hole for passing the positioning screw is provided on the left end of the base, a transverse sliding groove for guiding the movement of the third clamping block and an embedding groove matching the first positioning block are also provided on the base, the first positioning block is inserted into the embedding groove and can be moved to a specified position along the embedding groove, the first positioning block is fixed to the base by a first positioning pin, a second positioning hole for passing the positioning screw is provided on the first positioning block, the left end of the positioning screw extends outward through the first positioning hole, and the right end of the positioning screw is sleeved with a second sleeve and inserted into the second positioning hole.

[0024] Further, the first pressing assembly comprises:

[0025] The upper end of the first push rod abuts against the lower surface of the first hook-shaped pressing block and the lower end of the first push rod penetrates into the first clamping block.

[0026] A first clamping rod is provided on the first clamping block and has a front end extending into the first clamping block to push the first push rod upward.

[0027] The lower end of the first push rod is a first inclined surface,

[0028] The front end of the first clamping rod is a second inclined surface adapted to the first inclined surface.

[0029] The first clamping rod is rotated, and the second inclined surface of the first clamping rod moves forward, pushing the first inclined surface, and driving the first push rod to push upward.

[0030] Preferably, the second pressing assembly comprises:

[0031] The upper end of the second push rod abuts against the lower surface of the rear end of the second hook-shaped pressing block and the lower end of the second push rod penetrates into the second clamping block.

[0032] A second clamping rod is provided on the second clamping block and has a front end extending into the second clamping block to push the second push rod upward.

[0033] The lower end of the second push rod is a third inclined surface.

[0034] The front end of the second clamping rod is a fourth inclined surface matched with the third inclined surface.

[0035] The second clamping rod is rotated, and the fourth inclined surface of the second clamping rod moves forward, pushing the third inclined surface, and driving the second push rod to push upward.

[0036] Furthermore, the third pressing assembly includes:

[0037] A third clamping rod mounted on the third clamping block,

[0038] A long rod connected to the end of the third clamping rod in the middle,

[0039] The short rods are connected to both ends of the long rod and are symmetrically arranged.

[0040] The upper end of the top block abuts against the lower surface of the rear end of the third hook-shaped pressing block and vertically penetrates the end of the short rod.

[0041] The upper end of the top block has a fifth inclined surface,

[0042] The third clamping rod is rotated to push the top block to move rightward along the base through the long rod and the short rod, and the fifth inclined surface lifts the rear end of the third hook-shaped pressing block upward.

[0043] Furthermore, a first fixing block is arranged on the third clamping block, and a first threaded hole for penetrating the third clamping rod is opened on the first fixing block.

[0044] Preferably, the third clamping block is symmetrically provided with guide grooves for guiding the movement of the top block.

[0045] The present invention provides a clamping method for a universal fixture for a small five-axis machining center, comprising the following steps:

[0046] The first clamping rod is rotated, the second inclined surface of the first clamping rod moves backward, the first push rod is in the initial state, and the first hook-shaped pressing block is in the relaxed state; the second clamping rod is rotated, the fourth inclined surface of the second clamping rod moves backward, the second push rod is in the initial state, and the second hook-shaped pressing block is in the relaxed state; the third clamping rod is rotated, and the push block is pushed to move rightward along the base through the long rod and the short rod, and the third hook-shaped pressing block is in the relaxed state;

[0047] Rotate the first threaded rod to move the first clamping block to one outer side of the base, rotate the second threaded rod to move the second clamping block to the other outer side of the base, and rotate the positioning screw to move the third clamping block to the leftmost side of the base;

[0048] Then, according to the size of the plate-like parts, the first clamping block is moved to a suitable position by rotating the first threaded rod, the second clamping block is moved to a suitable position by rotating the second threaded rod, and the third clamping block is moved to a suitable position by rotating the positioning screw rod, so as to realize the positioning of the plate-like parts;

[0049] Finally, rotate the first clamping rod, the second inclined surface of the first clamping rod moves forward, pushing the first inclined surface, driving the first push rod to push upward, thereby realizing the clamping of the first hook-shaped pressure block; rotate the second clamping rod, the fourth inclined surface of the second clamping rod moves forward, pushing the third inclined surface, driving the second push rod to push upward, thereby realizing the clamping of the second hook-shaped pressure block; rotate the third clamping rod, and through the long rod and the short rod, pull the push block to move to the left along the base, and the fifth inclined surface pushes the rear end of the third hook-shaped pressure block upward, thereby realizing the synchronous clamping of the two third hook-shaped pressure blocks.

[0050] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0051] (1) The present invention realizes the clamping and positioning of the workpiece by means of the longitudinally adjustable first clamping block and the second clamping block, and the transversely adjustable third clamping block, which is convenient for clamping parts of different sizes and types and has a wider range of applications;

[0052] (2) The present invention increases the convenience of clamp operation by using the first clamping assembly, the second clamping assembly and the third clamping assembly. Compared with the clamping method of the general clamp using bolts to tighten the clamping block, under the same size and height limit, the present invention has a greater drilling depth when clamping plate parts in drilling conditions;

[0053] (3) The present invention can be directly connected to the force measuring equipment of the equipment to realize the real-time monitoring of the cutting force during the processing, so as to identify the actual situation of the tool cutting processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the structure of the present invention when clamping a workpiece;

[0055] Figure 2 It is a structural schematic diagram of the present invention;

[0056] Figure 3 It is a structural schematic diagram of the base in the present invention;

[0057] Figure 4 It is a schematic diagram of the connection between the positioning screw rod and the base in the present invention;

[0058] Figure 5 It is a structural schematic diagram of the first positioning block in the present invention;

[0059] Figure 6 It is a structural diagram of the third clamping block in the present invention;

[0060] Figure 7 It is a structural schematic diagram of the third pressing assembly in the present invention;

[0061] Figure 8 is a top view of the third clamping assembly in the present invention;

[0062] Fig. 9 is a partial cross-sectional view of the third clamping assembly in the present invention;

[0063] Fig.10 It is a schematic diagram of the connection between the first clamping block, the second clamping block and the base in the present invention;

[0064] Fig.11 It is a schematic diagram of the connection between the first threaded rod, the second threaded rod and the base in the present invention;

[0065] Fig.12 It is a structural schematic diagram of the first pressing assembly in the present invention;

[0066] Fig.13 It is a schematic structural diagram of the second clamping assembly in the present invention. DETAILED DESCRIPTION

[0067] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0068] like Figure 1 and Figure 2 As shown, the present invention is a universal fixture for a small five-axis machining center, including a base 1, a first clamping block 2, a second clamping block 3, a third clamping block 4, a longitudinal positioning assembly, a transverse positioning assembly, a first hook-shaped pressing block 5, a second hook-shaped pressing block 6, a third hook-shaped pressing block 7, a first clamping assembly, a second clamping assembly and a third clamping assembly.

[0069] like Figure 1 , Fig.10 and Fig.11 As shown, the longitudinal positioning assembly includes a first threaded rod 8, a second threaded rod 9 and a first sleeve 10, the first threaded rod 8 and the second threaded rod 9 are arranged in parallel front and back and pass through the first clamping block and the second clamping block in sequence, wherein both ends of the first threaded rod 8 and the second threaded rod 9 are connected to the base 1 through the first sleeve 10. Figure 3 As shown, a positioning groove 104 for placing the first clamping block 2 and the second clamping block 3 is provided on the base 1, a fixing groove 105 is provided on one side wall of the positioning groove 104, a second fixing block 24 for mounting the first threaded rod 8 and the second threaded rod 9 is provided on the fixing groove 105, the second fixing block 24 is fixedly connected to the fixing groove 105 through a second fixing pin 25, and a third positioning hole 2401 for penetrating the first threaded rod 8 and a fourth positioning hole 2402 for penetrating the second threaded rod 9 are provided on the second fixing block 24. A fifth positioning hole 106 for penetrating the first threaded rod 8 and a sixth positioning hole 107 for penetrating the second threaded rod 9 are provided on the other side wall of the positioning groove 104. The first sleeve 10 is placed in the third positioning hole 2401, the fourth positioning hole 2402, the fifth positioning hole 106 and the sixth positioning hole 107 respectively, and the first threaded rod 8 passes through the first sleeve 10 in the third positioning hole 2401, the threaded hole of the first clamping block 2, the optical hole of the second clamping block 3 and the first sleeve 10 in the fifth positioning hole 106 in sequence. Rotating the first threaded rod 8 can drive the first clamping block 2 to move back and forth along the longitudinal direction of the base; the second threaded rod 9 passes through the first sleeve 10 in the fourth positioning hole 2402, the optical hole of the first clamping block 2, the threaded hole of the second clamping block 3 and the first sleeve 10 in the sixth positioning hole 107 in sequence. Rotating the second threaded rod 9 can drive the second clamping block 3 to move back and forth along the longitudinal direction of the base.

[0070] The lateral positioning assembly includes a positioning screw 11, which is transversely arranged on the base 1 and connected to the base at both ends. A connecting block 26 is fixedly arranged below the third clamping block 4, and a screw thread hole 2601 is opened on the connecting block 26. The connecting block 26 is threadedly connected to the positioning screw 11. Figure 4 As shown, a first positioning hole 101 is provided on the left end of the base 1, and a transverse slide groove 102 for guiding the movement of the third clamping block 4 is also provided on the base 1. The connecting block 26 passes through the transverse slide groove 102 and is threadedly connected to the positioning screw rod 11. The transverse slide groove 102 is parallel to the positioning screw rod 11. Figure 4 and Figure 5As shown, the base 1 is further provided with an embedding groove 103 at the right end of the horizontal slide groove 102, and a first positioning block 12 is provided at the right end of the base 1. The first positioning block 12 can adjust the travel distance of the positioning screw, and the first positioning block 12 is adapted to the embedding groove 103. The first positioning block 12 is inserted into the embedding groove 103 and can be moved to a specified position along the embedding groove 103, and the first positioning block 12 is fixed to the base 1 by the first positioning pin 13. The base 1 is provided with a seventh positioning hole 108 for inserting the first positioning pin 13; the first positioning block 12 is provided with a second positioning hole 1201 for penetrating the positioning screw, and the left end of the positioning screw 11 extends outward through the first positioning hole 101, and the right end of the positioning screw 11 is sleeved with a second sleeve 14 and inserted into the second positioning hole 1201, and the positioning screw 11 is rotated, and the connecting block 26 drives the third clamping block 4 to move back and forth laterally along the base. A number of mounting holes 109 are evenly arranged on the base 1 for mounting the multifunctional fixture on the machining center. The multifunctional fixture can also be used to connect high-precision mechanical sensors to measure drilling and milling forces during machining.

[0071] like Figure 7 and Fig.12 As shown, the middle part of the first hook-shaped pressing block 5 is hinged to the first clamping block 2 through the pressing block bracket 27, and the first clamping assembly includes a first push rod 15 and a first clamping rod 16. The lower end of the first push rod 15 is a first inclined surface, and the upper end of the first push rod 15 abuts against the lower surface of the rear end of the first hook-shaped pressing block 5. The lower end of the first push rod 15 vertically extends into the interior of the first clamping block 2. The front end of the first clamping rod 16 has a disc-shaped protrusion, which is embedded from the side opening of the first wedge block 28 and nested with the first wedge block 28. The front end of the first wedge block 28 is a second inclined surface adapted to the first inclined surface. The first clamping rod 16 is horizontally penetrated on the first clamping block 2. The first clamping rod 16 moves forward, pushes the first wedge block through the second inclined surface of the first wedge block, and drives the first push rod 15 to push upward. Alternatively, the first clamping rod 16 is an integrally formed structure. A cross-shaped groove is provided in the first clamping block 2 to facilitate the insertion of the first push rod 15 and the first clamping rod 16. A first workpiece groove 201 is provided on the first clamping block 2 for positioning a workpiece.

[0072] like Figure 7 and Fig.13As shown, the middle part of the second hook-shaped pressing block 6 is hinged with the second clamping block 3 through the pressing block bracket 27, and the second clamping assembly includes a second push rod 17 and a second clamping rod 18. The lower end of the second push rod 17 is a third inclined surface, and the upper end of the second push rod 17 abuts against the lower surface of the rear end of the second hook-shaped pressing block 6. The lower end of the second push rod 17 penetrates the second clamping block 3 and vertically extends into the interior of the second clamping block 3. The front end of the second clamping rod 18 has a disc-shaped protrusion, which is embedded from the side opening of the second wedge block 29 and is nested and connected with the second wedge block 29. The front end of the second wedge block 29 is a fourth inclined surface adapted to the third inclined surface. The second clamping rod 18 is horizontally penetrated on the second clamping block 3. The second clamping rod 18 moves forward, and pushes the third inclined surface through the fourth inclined surface of the second wedge block, driving the second push rod 17 to push upward. Alternatively, the second clamping rod 18 is an integrally formed structure and a cross-shaped groove is provided in the second clamping block 3 to facilitate the insertion of the second push rod 17 and the second clamping rod 18. The second clamping block 3 is provided with a second workpiece groove 301 for positioning the workpiece.

[0073] like Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the third clamping assembly includes a third clamping rod 19, a long rod 20, a short rod 21 and a top block 22. A first fixing block 23 is provided on the third clamping block 4. A first threaded hole 2301 for passing the third clamping rod is provided on the first fixing block 23. A guide groove 401 for guiding the movement of the top block 22 is symmetrically provided on the third clamping block 4. A limit rod 30 is horizontally provided on the guide groove 401. The top block 22 is passed through the limit rod 30. The limit rod 30 can limit the top block 22 from sliding out of the guide groove 401. The third clamping rod 19 is mounted on the first fixed block 23 of the third clamping block 4. The middle part of the long rod 20 is connected to the end of the third clamping rod through the spherical surface 1901. The two ends of the long rod are connected to the short rod 22 through the connecting pin 31 and the first ring 32 respectively. The two short rods 22 are symmetrically arranged. The upper end of the top block 22 abuts against the lower surface of the rear end of the third hook-shaped pressing block 7. The top block 22 is vertically penetrated on the second ring 33 at one end of the short rod 22. The upper end of the top block 22 has a fifth inclined surface. The third clamping rod 19 is rotated, and the top block 22 is pulled to move leftward along the guide groove 401 of the base through the long rod 20 and the short rod 21. The fifth inclined surface lifts the rear end of the third hook-shaped pressing block 7 upward. The third clamping block 4 is provided with a third workpiece groove 402 for positioning the workpiece.

[0074] The present invention provides a clamping method for a universal fixture for a small five-axis machining center, comprising the following steps:

[0075] First, the first clamping rod 16 is rotated, the second inclined surface of the first clamping rod 16 moves backward, the first push rod 15 is in the initial state, and the first hook-shaped pressing block 5 is in the relaxed state. The second clamping rod 18 is rotated, the fourth inclined surface of the second clamping rod 18 moves backward, the second push rod 17 is in the initial state, and the second hook-shaped pressing block 6 is in the relaxed state. The third clamping rod 19 is rotated, and the push block 22 is pushed to move rightward along the base through the long rod 20 and the short rod 21, and the third hook-shaped pressing block 7 is in the relaxed state.

[0076] At the same time, the first threaded rod 8 is rotated to move the first clamping block 2 to one outer side of the base, the second threaded rod 9 is rotated to move the second clamping block 3 to the other outer side of the base, and the positioning screw 11 is rotated to move the third clamping block 4 to the leftmost side of the base;

[0077] Then, according to the size of the plate-like parts, the first clamping block 2 is moved to a suitable position by rotating the first threaded rod 8, the second clamping block 3 is moved to a suitable position by rotating the second threaded rod 9, and the third clamping block 4 is moved to a suitable position by rotating the positioning screw 11, so as to realize the positioning of the plate-like parts;

[0078] Finally, rotate the first clamping rod 16, the second inclined surface of the first clamping rod 16 moves forward, pushing the first inclined surface, driving the first push rod 15 to push upward, thereby realizing the clamping of the first hook-shaped pressure block 5; rotate the second clamping rod 18, the fourth inclined surface of the second clamping rod 18 moves forward, pushing the third inclined surface, driving the second push rod 17 to push upward, thereby realizing the clamping of the second hook-shaped pressure block 6; rotate the third clamping rod 19, and push the push block 22 to move rightward along the base through the long rod 20 and the short rod 21, and the fifth inclined surface pushes the rear end of the third hook-shaped pressure block 7 upward, thereby realizing the synchronous clamping of the two third hook-shaped pressure blocks 7.

Claims

1. A universal fixture for a small five-axis machining center, characterized in that: include: Base (1), A first clamping block (2) and a second clamping block (3) are located at the right end of the base and can move back and forth along the longitudinal direction of the base and are arranged in parallel. A third clamping block (4) is located at the left end of the base, can move back and forth laterally along the base, and cooperates with the first clamping block and the second clamping block to clamp the workpiece. A longitudinal positioning assembly for respectively driving the first clamping block and the second clamping block to move back and forth longitudinally along the base, the longitudinal positioning assembly comprising: a first threaded rod (8) and a second threaded rod (9) arranged in parallel front and back and passing through the first clamping block and the second clamping block in sequence, wherein both ends of the first threaded rod (8) and the second threaded rod (9) are connected to the base (1) through a first sleeve (10), the first threaded rod (8) passes through the threaded hole of the first clamping block (2) and the light hole of the second clamping block (3) in sequence, and the second threaded rod (9) passes through the light hole of the first clamping block (2) and the threaded hole of the second clamping block (3) in sequence; A lateral positioning assembly for driving the third clamping block to move back and forth laterally along the base, the lateral positioning assembly comprising a positioning screw (11) which is laterally passed through the base and connected to the base at both ends, the third clamping block (4) being threadedly connected to the positioning screw (11), and the third clamping block (4) can move back and forth laterally along the base by rotating the positioning screw (11); A first hook-shaped pressing block (5) is hingedly connected in the middle to the top of the first clamping block and is used to press the workpiece. A second hook-shaped pressing block (6) is hinged at its middle portion above the second clamping block and is used to press the workpiece. A pair of third hook-shaped pressing blocks (7) symmetrically hinged above the third clamping block and used to press the workpiece, A first clamping assembly for adjusting the clamping state of the first hook-shaped clamping block, the first clamping assembly comprising: a first push rod (15) whose upper end abuts against the lower surface of the first hook-shaped clamping block (5) and whose lower end penetrates into the first clamping block (2); a first clamping rod (16) which penetrates the first clamping block (2) and whose front end extends into the first clamping block (2) and pushes the first push rod (15) to move upward; the lower end of the first push rod (15) is a first inclined surface, and the front end of the first clamping rod (16) is a second inclined surface adapted to the first inclined surface; when the first clamping rod (16) is rotated, the second inclined surface of the first clamping rod (16) moves forward, pushes the first inclined surface, and drives the first push rod (15) to push upward; A second clamping assembly for adjusting the clamping state of the second hook-shaped clamping block, the second clamping assembly comprising: a second push rod (17) whose upper end abuts against the lower surface of the rear end of the second hook-shaped clamping block (6) and whose lower end penetrates into the second clamping block (3); a second clamping rod (18) which is penetrated on the second clamping block (3) and whose front end extends into the second clamping block (3) and pushes the second push rod (17) to move upward; the lower end of the second push rod (17) is a third inclined surface, and the front end of the second clamping rod (18) is a fourth inclined surface adapted to the third inclined surface; when the second clamping rod (18) is rotated, the fourth inclined surface of the second clamping rod (18) moves forward, pushes the third inclined surface, and drives the second push rod (17) to push upward; and a third clamping assembly for synchronously adjusting the clamping state of the two third hook-shaped clamping blocks, the third clamping assembly comprising: a third clamping rod (19) mounted on the third clamping block, a long rod (20) whose middle part is connected to the end of the third clamping rod, short rods (21) respectively connected to the two ends of the long rod and symmetrically arranged, a top block (22) whose upper end abuts against the lower surface of the rear end of the third hook-shaped clamping block (7) and vertically penetrates the end of the short rod, the upper end of the top block (22) having a fifth inclined surface, the third clamping rod (19) is rotated, and the top block (22) is pulled to move rightward along the base through the long rod (20) and the short rod (21), and the rear end of the third hook-shaped clamping block (7) is lifted upward by the fifth inclined surface, and the third clamping block (4) is provided with a first fixed block (23), and the first fixed block (23) is provided with a first threaded hole (2301) for penetrating the third clamping rod; The right end of the base (1) is provided with a first positioning block (12) capable of adjusting the travel distance of the positioning screw rod, the left end of the base (1) is provided with a first positioning hole (101) for passing the positioning screw rod, the base (1) is also provided with a transverse sliding groove (102) for guiding the movement of the third clamping block (4) and an embedding groove (103) matched with the first positioning block (12), the first positioning block (12) is inserted into the embedding groove (103) and can be moved along the embedding groove (103) to a specified position, and the first positioning pin (13) is used to move the third clamping block (4) to the first positioning block (12). ) fixes the first positioning block (12) to the base (1), the first positioning block (12) is provided with a second positioning hole (1201) for passing the positioning screw rod, the left end of the positioning screw rod (11) passes through the first positioning hole (101) and extends outward, and the right end of the positioning screw rod (11) is sleeved with a second sleeve (14) and inserted into the second positioning hole (1201); the third clamping block (4) is provided with a first fixing block (23), and the first fixing block (23) is provided with a first threaded hole (2301) for passing the third clamping rod.

2. The universal fixture for a small five-axis machining center according to claim 1 is characterized in that: The third clamping block (4) is symmetrically provided with guide grooves (401) for guiding the movement of the top block (22).

3. A clamping method using the universal fixture for a small five-axis machining center as described in any one of claims 1 or 2, characterized in that: The steps include: The first clamping rod (16) is rotated, the second inclined surface of the first clamping rod (16) moves backward, the first push rod (15) is in an initial state, and the first hook-shaped pressing block (5) is in a relaxed state; the second clamping rod (18) is rotated, the fourth inclined surface of the second clamping rod (18) moves backward, the second push rod (17) is in an initial state, and the second hook-shaped pressing block (6) is in a relaxed state; the third clamping rod (19) is rotated, and the push block (22) is driven to move leftward along the base through the long rod (20) and the short rod (21), and the third hook-shaped pressing block (7) is in a relaxed state; The first threaded rod (8) is rotated to move the first clamping block (2) to one outer side of the base, the second threaded rod (9) is rotated to move the second clamping block (3) to the other outer side of the base, and the positioning screw rod (11) is rotated to move the third clamping block (4) to the leftmost side of the base; Then, according to the size of the plate-like part, the first clamping block (2) is moved to a suitable position by rotating the first threaded rod (8), the second clamping block (3) is moved to a suitable position by rotating the second threaded rod (9), and the third clamping block (4) is moved to a suitable position by rotating the positioning screw rod (11), thereby achieving positioning of the plate-like part; Finally, the first clamping rod (16) is rotated, and the second inclined surface of the first clamping rod (16) moves forward, pushing the first inclined surface, driving the first push rod (15) to push upward, thereby realizing the compression of the first hook-shaped pressing block (5); the second clamping rod (18) is rotated, and the fourth inclined surface of the second clamping rod (18) moves forward, pushing the third inclined surface, driving the second push rod (17) to push upward, thereby realizing the compression of the second hook-shaped pressing block (6); the third clamping rod (19) is rotated, and the push block (22) is pulled to move rightward along the base through the long rod (20) and the short rod (21), and the fifth inclined surface pushes the rear end of the third hook-shaped pressing block (7) upward, thereby realizing the synchronous compression of the two third hook-shaped pressing blocks (7).

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