High-precision numerical control machining center

Abstract

The application relates to the field of numerical control equipment, in particular to a high-precision numerical control machining center which comprises a machine body, a machining table for placing parts to be machined is arranged in the machine body, a clamping assembly for clamping the parts, and a fine adjustment assembly for compensating the clamping error of the clamping assembly are arranged in the machine body; the clamping assembly comprises a bidirectional screw rod rotatably arranged below the machining table, a motor electrically connected to a control system is coaxially arranged at one end of the bidirectional screw rod, two sections of threads of the bidirectional screw rod correspondingly have sliding blocks, a threaded sleeve threadedly connected with the bidirectional screw rod is rotatably arranged in each sliding block, and a clamping arm is arranged on each sliding block. The application has the advantages of improving the machining precision of workpieces.

Description

TECHNICAL FIELD

[0001] The application relates to the field of numerical control equipment, in particular to a high-precision numerical control machining center. BACKGROUND

[0002] The machining center is a milling machine controlled by an electronic digital signal and provided with a tool magazine, and is widely applied to the field of mechanical manufacturing due to high adaptability, high production efficiency and stable and reliable machining quality.

[0003] At present, when the machining center processes parts in batches, individual defective products are usually generated, and the main reason for the defective products is that the fastening degree of the parts is different when the clamping assembly is manually operated each time to clamp the parts, and the parts with a lighter clamping fastening degree will shake and cause machining errors, and obvious defects exist. SUMMARY

[0004] In order to improve the machining precision, the application provides a high-precision numerical control machining center.

[0005] The high-precision numerical control machining center provided by the application adopts the following technical scheme:

[0006] The high-precision numerical control machining center comprises a machine body, a machining table for placing parts to be machined is arranged in the machine body, a clamping assembly for clamping the parts and a fine adjustment assembly for compensating for clamping errors of the clamping assembly are arranged in the machine body; the clamping assembly comprises a bidirectional threaded rod rotatably arranged below the machining table, a motor electrically connected to a control system is coaxially arranged at one end of the bidirectional threaded rod, two sections of threads of the bidirectional threaded rod correspondingly have sliding blocks, a threaded sleeve threadedly connected with the bidirectional threaded rod is rotatably arranged in each sliding block, and a clamping arm is arranged on each sliding block; the fine adjustment assembly comprises a mounting seat located at a length midpoint of the bidirectional threaded rod, the bidirectional threaded rod rotatably penetrates through the mounting seat, a bidirectional air cylinder is further arranged on the mounting seat, two piston rods of the bidirectional air cylinder are coaxially connected with fine adjustment pins, an insertion hole in insertion cooperation with the fine adjustment pins is arranged on the threaded sleeve, the diameter of the fine adjustment pin gradually decreases in a direction away from the length midpoint of the bidirectional threaded rod, a C-shaped deflection groove is circumferentially arranged in the sliding block, a tab in sliding cooperation with the deflection groove is welded on the outer wall of the threaded sleeve, and a return spring is top-supported between the tab and the end portion of the deflection groove.

[0007] By adopting the technical scheme, the worker places the part to be machined on the workbench, and then starts the motor, the output shaft of the motor drives the bidirectional threaded rod to rotate, and under the thread cooperation of the threaded sleeve and the bidirectional threaded rod, the two sliding blocks are close to each other to a set distance. At this time, the control system closes the motor and the output shaft of the motor cannot rotate, the two piston rods of the bidirectional cylinder are simultaneously extended, drive the fine adjustment pin to be inserted into the corresponding insertion hole, and in the process of insertion and cooperation, the threaded sleeve is rotated under stress, so as to drive the paddle to extrude the return compression spring, and under the action of the threaded sleeve, the sliding block is accurately moved to the clamping position. By the above-mentioned mode, the movement of the sliding block during clamping is divided into two steps and carried out in sequence, that is, first quickly moved to the approximate position, and then quickly moved a small amount to realize accurate clamping, so as to ensure that the clamping and fastening degrees of each workpiece are the same and the clamping is stable, which is beneficial to improve the machining precision of the workpiece.

[0008] Optionally, the sliding block comprises two unit blocks and the two unit blocks are detachably connected, opposite sides of the two unit blocks are respectively provided with accommodating cavities for rotation of the threaded sleeve, and each unit block is further provided with a clearance hole for allowing the bidirectional threaded rod to be accommodated, the clearance hole being communicated with the accommodating cavity and having a diameter smaller than that of the accommodating cavity.

[0009] By adopting the above technical scheme, the clearance hole and the accommodating cavity with different diameters can limit the threaded sleeve, and the possibility of movement of the threaded sleeve relative to the sliding block is reduced.

[0010] Optionally, the inner bottom wall of the machine body is provided with a guide groove parallel to the bidirectional threaded rod, and each unit block is provided with a guide block sliding in the guide groove.

[0011] By adopting the above technical scheme, the sliding cooperation of the guide groove and the guide block plays a guiding role in the relative movement between the two sliding blocks.

[0012] Optionally, the bottom of the guide block is provided with a roller.

[0013] By adopting the above technical scheme, the roller can make the guide block slide more smoothly in the guide groove.

[0014] Optionally, the mounting seat is provided with a fine adjustment ring on each side axially relative to the bidirectional threaded rod, the fine adjustment ring is slidingly and rotatably sleeved on the bidirectional threaded rod, a transition compression spring is arranged between the fine adjustment ring and the mounting seat, the side of the fine adjustment ring away from the mounting seat is provided with an insertion pin inserted into the insertion hole, and the fine adjustment ring is provided with a fine adjustment hole for insertion and cooperation with the fine adjustment pin.

[0015] By adopting the technical scheme, the fine adjustment ring can be driven to rotate during rotation of the bidirectional threaded rod, until the deformation force of the transition compression spring acts on the fine adjustment ring, so that the insertion pin is inserted into the insertion hole. When the piston rod of the bidirectional cylinder is extended, the fine adjustment pin is inserted into the corresponding fine adjustment hole. The direct insertion fit between the fine adjustment pin and the insertion hole is converted into the combined insertion fit among the insertion pin, the fine adjustment pin and the fine adjustment hole, which is beneficial to the accurate adjustment and clamping of workpieces of different sizes.

[0016] Optionally, a mounting blind hole is formed on the fine adjustment ring relative to the position of the insertion pin, and a magnetic block is arranged in the mounting blind hole. The insertion pin is in insertion fit with the mounting blind hole and is magnetically attracted to the magnetic block.

[0017] By adopting the technical scheme, the worker can replace the insertion pin of different lengths through the insertion fit between the mounting blind hole and the insertion pin, so as to further expand the size range of the accurate adjustment and clamping of the corresponding workpiece.

[0018] Optionally, a wear-resistant spacer is arranged between the threaded sleeve and the inner wall of the accommodating cavity.

[0019] By adopting the technical scheme, the wear-resistant spacer is convenient to replace after being worn.

[0020] Optionally, polytetrafluoroethylene is coated on the insertion pin and the fine adjustment pin.

[0021] By adopting the technical scheme, the insertion fit between the insertion pin and the insertion hole and the fine adjustment pin and the fine adjustment hole can be smoother.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. By arranging the clamping assembly and the fine adjustment assembly, the movement of the sliding block during clamping is divided into two steps, i.e., the sliding block is first quickly moved to an approximate position, and then quickly and slightly moved to achieve accurate clamping, so as to ensure that the clamping and fastening degree of each workpiece is the same and stable, which is beneficial to improving the machining precision of the workpiece.

[0024] 2. The direct insertion fit between the fine adjustment pin and the insertion hole is converted into the combined insertion fit among the insertion pin, the fine adjustment pin and the fine adjustment hole, which is beneficial to the accurate adjustment and clamping of workpieces of different sizes. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0026] Figure 2 is a sectional view of the bidirectional threaded rod, the fine adjustment ring and the mounting seat in the embodiment of the present application.

[0027] Figure 3 is an exploded view between the unit block, the wear-resistant spacer and the threaded sleeve in the embodiment of the application.

[0028] Explanation of reference numerals: 1, machine body; 2, machining table; 31, bidirectional threaded rod; 32, motor; 33, threaded sleeve; 331, plug-in hole; 34, clamping arm; 35, sliding block; 351, unit block; 3511, deflection groove; 3512, accommodating cavity; 3513, clearance hole; 41, mounting seat; 42, bidirectional air cylinder; 43, fine adjustment pin; 44, push piece; 45, return compression spring; 5, guide groove; 6, guide block; 7, roller; 8, fine adjustment ring; 81, fine adjustment hole; 82, mounting blind hole; 9, transition compression spring; 10, plug-in pin; 11, magnetic block; 12, wear-resistant spacer. DETAILED DESCRIPTION

[0029] The following will be described in detail with reference to the accompanying drawings. Figures 1-3 The application will be described in further detail.

[0030] The embodiment of the application discloses a high-precision numerical control machining center.

[0031] Reference will be made to Figure 1 , the high-precision numerical control machining center comprises a machine body 1 which is internally hollow, a machining table 2 for placing a part to be machined is arranged in the machine body 1, and a clamping assembly for clamping the part and a fine adjustment assembly for compensating for clamping error of the clamping assembly are further arranged in the machine body 1.

[0032] Reference will be made to Figure 1 , Figure 2 and Figure 3 , the clamping assembly comprises a bidirectional threaded rod 31 rotatably arranged below the machining table 2, a motor 32 coaxially connected to one end of the bidirectional threaded rod 31 is bolted in the machine body 1, and the motor 32 is electrically connected to a control system. The motor 32 adopts a brake motor 32 in the prior art, that is, the output shaft of the motor 32 cannot rotate again after the motor 32 is powered off.

[0033] Reference will be made to Figure 1 , Figure 2 and Figure 3 , the two ends of the bidirectional threaded rod 31 are respectively threaded with one sliding block 35, and a threaded sleeve 33 is rotatably arranged on each sliding block 35, and the threaded sleeve 33 is in threaded connection with the corresponding rod body of the bidirectional threaded rod 31. The top of each sliding block 35 is further bolted with a clamping arm 34.

[0034] Reference will be made to Figure 1 , Figure 2 and Figure 3When the worker places the part to be processed on the processing table 2, the motor 32 is started by the control system, and the output shaft of the motor 32 drives the bidirectional threaded rod 31 to rotate. Since the friction between the threaded sleeve 33 and the sliding block 35 is large, the threaded sleeve 33 and the sliding block 35 do not rotate relative to each other at this time, and the two sliding blocks 35 are relatively close to each other, and the two clamping arms 34 cooperate to clamp the part.

[0035] With reference to Figure 1 , Figure 2 and Figure 3 , since there is a certain deviation between the actual number of revolutions of the output shaft of the motor 32 and the set theoretical number of revolutions, the sliding block 35 does not accurately move to the clamping position.

[0036] To solve the above problems, the fine adjustment assembly includes a mounting seat 41 located at the midpoint of the length of the bidirectional threaded rod 31, which is bolted in the machine body 1. The mounting seat 41 is bolted with a bidirectional cylinder 42, and the two piston rods of the bidirectional cylinder 42 are coaxially threaded with fine adjustment pins 43.

[0037] With reference to Figure 1 , Figure 2 and Figure 3 , one end of the threaded sleeve 33 relative to the mounting seat 41 is provided with a plug-in hole 331 for plug-in cooperation with the fine adjustment pin 43, and the diameter of the fine adjustment pin 43 gradually decreases in the direction away from the midpoint of the length of the bidirectional threaded rod 31.

[0038] The inner circumference of the sliding block 35 is provided with a C-shaped deflection groove 3511, and the outer side wall of the threaded sleeve 33 is welded with a push piece 44 located in the deflection groove 3511 and in sliding cooperation with the deflection groove 3511. The end portion between the push piece 44 and the deflection groove 3511 is supported by a return compression spring 45.

[0039] With reference to Figure 1 , Figure 2 and Figure 3 , when the two sliding blocks 35 are close to each other to a set minimum distance, which is greater than the spacing of the two clamping arms 34 just clamped, the two piston rods of the bidirectional cylinder 42 are simultaneously extended, so that the fine adjustment pin 43 is inserted into the corresponding plug-in hole 331.

[0040] During the plug-in cooperation of the fine adjustment pin 43 and the plug-in hole 331, the corresponding threaded sleeve 33 rotates, the threaded sleeve 33 drives the push piece 44 to rotate in the deflection groove 3511, and then the return compression spring 45 is extruded. Since the threaded sleeve 33 rotates and the output shaft of the motor 32 remains stationary at this time, the threaded sleeve 33 drives the sliding block 35 to accurately move to the clamping position.

[0041] With reference to Figure 1 , Figure 2 and Figure 3, through the above structure, the movement of the sliding block 35 during clamping is divided into two steps, first, the fast and rough approach is realized, and then the fast and accurate movement is realized, so that the clamping and fastening degree of each part is the same, and the possibility of low workpiece machining precision caused by loose clamping is reduced.

[0042] Referring to Figure 1 , Figure 2 and Figure 3 , when the piston rod of the bidirectional cylinder 42 is retracted at the same time, the reset compression spring 45 pushes the threaded sleeve 33 to reverse, at this time the sliding block 35 realizes micro movement, and then the motor 32 is started again, the output shaft of the motor 32 reverses, and the two sliding blocks 35 quickly move away from each other.

[0043] Referring to Figure 1 , Figure 2 and Figure 3 , the sliding block 35 includes two unit blocks 351 and the two unit blocks 351 are bolted, the opposite sides of the two unit blocks 351 are respectively provided with accommodating cavities 3512 for the rotation of the threaded sleeve 33, and the deflection grooves 3511 are distributed in the two accommodating cavities 3512.

[0044] Each unit block 351 is also provided with a let-go hole 3513 for letting go of the bidirectional threaded rod 31, the let-go hole 3513 communicates with the accommodating cavity 3512, and the diameter of the let-go hole 3513 is smaller than that of the accommodating cavity 3512, so that the threaded sleeve 33 in the accommodating cavity 3512 can be limited, and the possibility of movement of the threaded sleeve 33 relative to the sliding block 35 is reduced.

[0045] Referring to Figure 1 , Figure 2 and Figure 3 , a wear-resistant spacer sleeve 12 is arranged between the threaded sleeve 33 and the inner wall of the accommodating cavity 3512, which facilitates the replacement of the worn parts.

[0046] Referring to Figure 1 , Figure 2 and Figure 3 , a guide groove 5 parallel to the bidirectional threaded rod 31 is formed on the inner bottom wall of the body 1, and a guide block 6 sliding in the guide groove 5 is welded on each unit block 351, and the sliding fit between the guide block 6 and the guide groove 5 guides the movement of the two sliding blocks 35.

[0047] Referring to Figure 1 , Figure 2 and Figure 3 , the bottom of the guide block 6 is provided with a roller 7, which makes the guide block 6 move more smoothly in the guide groove 5.

[0048] Referring to Figure 1 ,Figure 2 And Figure 3 Considering that the machining center is usually used for machining workpieces of various sizes, the clamping position of the clamping assembly also needs to be adjusted accordingly, which may cause the clamping position of the sliding block 35 to exceed the extension range of the piston rod of the double-acting cylinder 42.

[0049] Referring to Figure 1 , Figure 2 and Figure 3 However, if the double-acting cylinder 42 is replaced, the replacement process is complex. In addition, the length of the piston rod of the double-acting cylinder 42 is often increased, and the longer the piston rod, the lower the stability of the extension process, which makes the plug-in cooperation between the fine adjustment pin 43 and the plug-in hole 331 more unstable.

[0050] Referring to Figure 1 , Figure 2 and Figure 3 Based on the above situation, the mounting seat 41 is arranged on both sides of the double-acting threaded rod 31 in the axial direction, and a fine adjustment ring 8 is slidably and rotatably sleeved on the double-acting threaded rod 31. The transition compression spring 9 is supported between the fine adjustment ring 8 and the mounting seat 41.

[0051] Referring to Figure 1 , Figure 2 and Figure 3 The side of the fine adjustment ring 8 away from the mounting seat 41 is provided with a plug-in pin 10 plugged into the plug-in hole 331, and the fine adjustment ring 8 is provided with a fine adjustment hole 81 for plug-in cooperation with the fine adjustment pin 43.

[0052] When the double-acting threaded rod 31 rotates, it can drive the fine adjustment ring 8 to rotate synchronously. When the two sliding blocks 35 are close enough to each other, the deformation force of the transition compression spring 9 acts on the fine adjustment ring 8, so that the plug-in pin 10 can be inserted into the corresponding plug-in hole 331.

[0053] Under the plug-in action of the plug-in pin 10 and the plug-in hole 331, the fine adjustment ring 8 remains stationary relative to the threaded sleeve 33. When the piston rod of the double-acting cylinder 42 is extended, the fine adjustment pin 43 is inserted into the corresponding fine adjustment hole 81, so that the fine adjustment ring 8 drives the threaded sleeve 33 to rotate through the plug-in pin 10.

[0054] The structure of the above structure converts the direct cooperation between the fine adjustment pin 43 and the plug-in hole 331 into the indirect combined cooperation between the plug-in pin 10, the plug-in hole 331, the fine adjustment pin 43 and the fine adjustment hole 81. Under the action of maintaining the original fine adjustment function, it can be suitable for clamping workpieces of different sizes.

[0055] Referring to Figure 1 , Figure 2 and Figure 3, the installation blind hole 82 is provided on the fine adjustment ring 8 and relative to the position of the insertion pin 10, the magnetic block 11 is arranged in the installation blind hole 82, the insertion pin 10 is inserted into the installation blind hole 82 and is magnetically attracted to the magnetic block 11. Through the insertion of the installation blind hole 82 and the insertion pin 10, the worker can replace the insertion pin 10 of different lengths, so as to further adapt to the clamping of workpieces of a larger range of different sizes.

[0056] With reference to Figure 1 Figure 2 Figure 3 Figure 2 Figure 3 , the insertion pin 10 and the fine adjustment pin 43 are coated with polytetrafluoroethylene, so as to improve the smoothness of the insertion of the insertion pin 10 and the insertion hole 331 and the fine adjustment pin 43 and the fine adjustment hole 81.

[0057] The implementation principle of the high-precision numerical control machining center in the embodiment of the application is as follows:

[0058] The worker places the part to be machined on the workbench, and then starts the motor 32, the output shaft of the motor 32 drives the bidirectional threaded rod 31 to rotate, the bidirectional threaded rod 31 drives the fine adjustment ring 8 to rotate, and the two sliding blocks 35 are close to each other under the threaded cooperation of the threaded sleeve 33 and the bidirectional threaded rod 31. The fine adjustment ring 8 is deformed under the action of the transition compression spring 9, until the insertion pin 10 is inserted into the insertion hole 331. When the two sliding blocks 35 are close to each other to a set distance, the control system stops the motor 32, and the output shaft of the motor 32 cannot rotate.

[0059] At this time, the piston rods of the bidirectional cylinder 42 are simultaneously extended, so as to drive the fine adjustment pin 43 and the fine adjustment hole 81 to be inserted and matched. Since the fine adjustment pin 43 and the fine adjustment hole 81 are deviated by a small angle in the circumferential direction about the axis of the bidirectional threaded rod 31, the fine adjustment ring 8 is slightly rotated under the force during the insertion and matching, so that the threaded sleeve 33 is slightly rotated by the insertion pin 10.

[0060] The rotation of the threaded sleeve 33 drives the push piece 44 and the wear-resistant spacer sleeve 12 to rotate on the one hand, and the push piece 44 extrudes the return compression spring 45 on the other hand. In addition, the threaded sleeve 33 also drives the sliding block 35 to move a small amount in the axial direction relative to the bidirectional threaded rod 31, and the small amount of movement can accurately move the two sliding blocks 35 to the clamping position.

[0061] When the workpiece machining is completed, the two piston rods of the bidirectional cylinder 42 are simultaneously retracted, the return compression spring 45 drives the threaded sleeve 33 to reverse, so that the two sliding blocks 35 move away from each other by a small amount. At this time, the motor 32 is started, the output shaft of the motor 32 reversely rotates, the two sliding blocks 35 quickly move away from each other, and the insertion pin 10 is separated from the insertion hole 331.

[0062] The above are the preferred embodiments of the application, but not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A high-precision numerical control machining center comprising a machine body (1) in which a machining table (2) for placing a part to be machined is arranged, characterized in that: The machine body (1) is internally provided with a clamping assembly for clamping parts, and a fine adjustment assembly for compensating for clamping errors of the clamping assembly. The clamping assembly comprises a two-way threaded rod (31) rotatably arranged below the machining table (2), one end of the two-way threaded rod (31) is coaxially provided with a motor (32) electrically connected to a control system, and two sections of threads of the two-way threaded rod (31) correspondingly have sliding blocks (35), each of the sliding blocks (35) is rotatably provided with a threaded sleeve (33) threadedly connected with the two-way threaded rod (31), and each of the sliding blocks (35) is provided with a clamping arm (34). The fine adjustment assembly comprises a mounting seat (41) located at the midpoint of the length of the two-way threaded rod (31), the two-way threaded rod (31) rotatably penetrates the mounting seat (41), the mounting seat (41) is further provided with a two-way cylinder (42), two piston rods of the two-way cylinder (42) are coaxially connected with fine adjustment pins (43), the threaded sleeve (33) is provided with a plug-in hole (331) for plug-in cooperation with the fine adjustment pin (43), the diameter of the fine adjustment pin (43) gradually decreases along the direction away from the midpoint of the length of the two-way threaded rod (31), the sliding block (35) is circumferentially provided with a C-shaped deflection groove (3511), the outer side wall of the threaded sleeve (33) is welded with a tab (44) located in the deflection groove (3511) and in sliding cooperation with the deflection groove (3511), and the tab (44) and the end of the deflection groove (3511) are supported by a reset compression spring (45).

2. The high-precision CNC machining center according to claim 1, characterized in that: The sliding block (35) comprises two unit blocks (351) and the two unit blocks (351) are detachably connected, opposite sides of the two unit blocks (351) are respectively provided with accommodating cavities (3512) for rotation of the threaded sleeve (33), each of the unit blocks (351) is further provided with a let-go hole (3513) for letting go of the two-way threaded rod (31), the let-go hole (3513) is communicated with the accommodating cavity (3512), and the diameter of the let-go hole (3513) is smaller than the diameter of the accommodating cavity (3512).

3. The high-precision CNC machining center according to claim 2, characterized in that: The inner bottom wall of the machine body (1) is provided with a guide groove (5) parallel to the two-way threaded rod (31), and each of the unit blocks (351) is provided with a guide block (6) sliding in the guide groove (5).

4. The high-precision CNC machining center according to claim 3, characterized in that: The bottom of the guide block (6) is provided with a roller (7).

5. The high-precision CNC machining center according to claim 1, characterized in that: The mounting seat (41) is provided with fine adjustment rings (8) on both sides of the axial direction of the two-way threaded rod (31), the fine adjustment rings (8) are slidingly and rotatably sleeved on the two-way threaded rod (31), the fine adjustment rings (8) and the mounting seat (41) are supported by a transition compression spring (9), one side of the fine adjustment ring (8) away from the mounting seat (41) is provided with a plug-in pin (10) plug-in cooperating with the plug-in hole (331), and the fine adjustment ring (8) is provided with a fine adjustment hole (81) for plug-in cooperation with the fine adjustment pin (43).

6. The high-precision CNC machining center according to claim 5, characterized in that: The fine adjustment ring (8) is provided with a mounting blind hole (82) opposite the position of the plug-in pin (10), a magnetic block (11) is arranged in the mounting blind hole (82), the plug-in pin (10) is in plug-in cooperation with the mounting blind hole (82) and is magnetically attracted to the magnetic block (11).

7. The high-precision CNC machining center according to claim 2, characterized in that: A wear-resistant spacer sleeve (12) is arranged between the threaded sleeve (33) and the inner wall of the accommodating cavity (3512).

8. The high-precision CNC machining center according to claim 5, characterized in that: The plug-in pin (10) and the fine adjustment pin (43) are coated with polytetrafluoroethylene.

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