CN111037436A

CN111037436A - Grinding wheel seat rotating mechanism of numerical control cutter grinding machine

Info

Publication number: CN111037436A
Application number: CN202010041429.0A
Authority: CN
Inventors: 顾约明; 邵慧江; 戴成涛
Original assignee: Shaoxing Zhifan Machinery Technology Co Ltd
Current assignee: Shaoxing Zhifan Machinery Technology Co Ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-04-21

Abstract

The invention discloses a grinding wheel seat rotating mechanism of a numerical control tool grinding machine, which comprises a rack, wherein an X-axis supporting plate and a Y-axis supporting plate which slide mutually and vertically are arranged on the rack, a B-axis rotatable working panel is arranged on the Y-axis supporting plate, a C-axis mounting seat is arranged on the B-axis rotatable working panel, a B-axis assembly is rotatably arranged on the Y-axis supporting plate and driven by a B-axis servo motor, the top of the B-axis assembly is connected with the B-axis rotatable working panel, a grinding wheel seat is arranged on the B-axis rotatable working panel, and two C-axis grinding wheel groups and D-axis grinding wheel groups which are mutually and vertically arranged are arranged on. The grinding wheel seat rotating mechanism can control the grinding angles of a plurality of grinding wheel sets together through the B-axis servo motor, is suitable for grinding machining of various different grinding angles, is small in control programming difficulty, can reduce the distance between grinding wheels, is more compact in structure, shortens the machining consumption time, and remarkably improves the machining efficiency.

Description

Grinding wheel seat rotating mechanism of numerical control cutter grinding machine

Technical Field

The invention belongs to the technical field of numerical control machine tools, and particularly relates to a grinding wheel seat rotating mechanism of a numerical control tool grinder.

Background

When a cutter is machined, a cylindrical grinding machine and a cutter grinding machine are needed, the cylindrical grinding machine has high precision and convenient operation, and can grind the circumferential surface and various conical surfaces of various workpieces; the cutter grinder can be used for producing and processing various milling cutters, drill bits, spiral cutters and the like.

The existing cylindrical grinding machine cannot process or produce various cutters due to the limitation of the cutting range, the existing cutter grinding machine (or tool grinding machine) also does not have the performance of the cylindrical grinding machine, and the multifunctional cutter processing equipment does not have the performance of the cylindrical grinding machine, and has complex operation and high equipment cost. The existing cylindrical grinding machine and the existing cutter grinding machine have poor compatibility, and cannot finish machining of a cutter at one time.

The existing cutter machining center is provided with two rows of grinding wheels on the same lifting upright post, the grinding wheels used in the grinding process are adjusted through the lifting of the upright post, each grinding wheel mechanism is arranged on a rotating mechanism in order to adjust the grinding angles of the two rows of grinding wheels, and in order to avoid mutual interference between the rotating mechanisms, a sufficient distance between the two grinding wheels is required, so that the overall structure of a machine tool is complex, the size is large, the manufacturing cost is high, the control programming is complex, the processing time consumption is long, and the processing efficiency is remarkably reduced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the grinding wheel seat rotating mechanism of the numerical control tool grinder, which has a compact structure, can control the grinding angles of a plurality of grinding wheels through one grinding wheel seat rotating mechanism, is accurate and convenient to control, has small control programming difficulty, can reduce the distance between the grinding wheels, has a more compact structure, shortens the processing time consumption and obviously improves the processing efficiency.

In order to solve the technical problem, the invention is solved by the following technical scheme: the grinding wheel seat rotating mechanism of the numerical control cutter grinding machine comprises a rack, wherein an X-axis rail and a Y-axis rail which are perpendicular to each other are arranged on the rack, an X-axis supporting plate is arranged on the X-axis rail, a Y-axis supporting plate is arranged on the Y-axis rail, a B-axis rotatable working panel is arranged on the Y-axis supporting plate, a C-axis mounting seat is arranged on the B-axis rotatable working panel, a B-axis assembly is rotatably arranged on the Y-axis supporting plate and driven by a B-axis servo motor, the top of the B-axis assembly is connected with the B-axis rotatable working panel, a grinding wheel seat is arranged on the B-axis rotatable working panel, and at least two grinding wheel groups are arranged on the grinding wheel seat. The angle of the B-axis rotatable working panel can be accurately controlled by the grinding wheel seat rotating mechanism through the B-axis servo motor, the grinding angles of the plurality of grinding wheel sets can be controlled together through the B-axis servo motor, the grinding wheel seat rotating mechanism is suitable for grinding machining of various different grinding angles, the programming control difficulty is small, the distance between grinding wheels can be reduced, the structure is more compact, the machining consumption time is shortened, and the machining efficiency is remarkably improved.

In the above technical scheme, preferably, the B-axis servo motor is fixed at the bottom of the Y-axis supporting plate, and the B-axis servo motor and the B-axis assembly are driven by a synchronous belt. Adopt this structure to make B axle assembly and B axle servo motor be hidden structure, the structure is compacter, reduces the whole volume of lathe, and the cost reduces.

In the above technical scheme, preferably, the grinding wheel base includes a C-axis mounting base, a C-axis assembly is arranged on the C-axis mounting base, a C-axis grinding wheel set is arranged on the C-axis assembly, and the C-axis assembly is driven by a C-axis servo motor; a Z-axis rail is further arranged on the C-axis mounting seat, a Z-axis supporting plate is arranged on the Z-axis rail, a Z-axis lead screw is arranged in the Z-axis rail along the direction of the Z-axis rail, the Z-axis lead screw is in threaded fit with the Z-axis supporting plate, and the Z-axis lead screw is driven by a Z-axis servo motor; a D-axis grinding wheel set is rotatably arranged on the Z-axis supporting plate and is driven by a D-axis servo motor; the X axis rail, the Y axis rail and the Z axis rail are perpendicular to each other, and the C axis grinding wheel set is perpendicular to the D axis grinding wheel set. The existing cutter machining center is provided with two rows of grinding wheels on the same lifting upright, the two rows of grinding wheels are provided with a rotating mechanism independently, the grinding wheels used are adjusted through the lifting of the upright when grinding is carried out, in order to prevent interference between the grinding wheels, the distance between the grinding wheels must be large, therefore, the lifting distance of the upright is large when the grinding wheels are switched, the whole size of a machine tool is large, the manufacturing cost is high, the stroke of the upright is long when the grinding wheels are switched, the consumed time is long, and the machining efficiency is reduced remarkably. And among the above-mentioned technical scheme, carry out abrasive machining through C axle emery wheel group and D axle emery wheel group, can carry out cylindrical grinding, screw thread grinding and cutter abrasive machining, remove through Z axle servo motor control Z axle layer board, control the position of D axle emery wheel group, the distance in the course of working is closer, and the switching stroke is little, and switching efficiency is higher, promotes whole machining efficiency.

Among the above-mentioned technical scheme, it is preferred, wind in the frame X axis rail and Y axis rail are provided with cooling water conservancy diversion passageway, cooling water conservancy diversion passageway one side is provided with the guide plate, guide plate export below sets up the loop filter water tank assembly, be equipped with the water pump in the loop filter water tank assembly, the water pump exit linkage cooling water pipeline. In the grinding wheel grinding process, cooling water can enter the filter water tank assembly along the cooling water guide channel, and is conveyed out by the water pump after being filtered in the water tank to be used for cooling the grinding wheel, so that on one hand, fragments can be prevented from being accumulated on the rack, and on the other hand, the fragments can be collected in the circulating filter water tank assembly to be conveniently recycled.

In the above technical solution, preferably, the circulation filtration water tank assembly includes a plurality of filter screens that can gradually reduce through particles along the water flow direction.

In the above technical solution, preferably, an X-axis lead screw is arranged in the X-axis rail along the X-axis rail direction, the X-axis lead screw is in threaded fit with the bottom of the X-axis supporting plate, and the X-axis lead screw is driven by an X-axis servo motor; and a Y-axis lead screw is arranged in the Y-axis rail along the Y-axis rail direction, the Y-axis lead screw is in threaded fit with the bottom of the Y-axis supporting plate, and the Y-axis lead screw is driven by a Y-axis servo motor. Adopt this structure can realize the accurate control of X axle layer board and Y axle layer board, compare traditional pneumatic cylinder and promote more accurately, can be used for the screw thread grinding.

In the above technical solution, preferably, the rack is rotatably provided with an X-axis manual adjustment shaft, the X-axis manual adjustment shaft is provided with a first bevel gear and an X-axis scale hand wheel, the X-axis lead screw is provided with a second bevel gear, and the first bevel gear is engaged with the second bevel gear. By adopting the structure, the X-axis lead screw can be driven to rotate by manually rotating the X-axis scale hand wheel, so that the manual feeding of the X-axis supporting plate can be realized.

Among the above-mentioned technical scheme, it is preferred, it is provided with the hand of Y axle and transfers the pivot to rotate in the frame, the hand of Y axle transfer the pivot with go up the Y axle lead screw and pass through synchronous belt drive, Y axle hand transfer pivot one end is provided with Y axle scale hand wheel. By adopting the structure, the Y-axis screw rod can be driven to rotate by manually rotating the Y-axis scale hand wheel, so that the manual feeding of the Y-axis supporting plate can be realized.

In the above technical scheme, preferably, the X-axis supporting plate is provided with an a-axis head frame and a tailstock, the a-axis head frame is provided with an a-axis servo motor and a flange plate, the flange plate is driven by the a-axis servo motor, and the tailstock is provided with an adjustable thimble.

In the above technical solution, preferably, an X-axis working panel is arranged on the X-axis supporting plate, a bottom plate is arranged between the a-axis headstock and the X-axis working panel, a first T-shaped positioning groove is arranged on the X-axis working panel along an X-axis rail direction, a first through hole is arranged on the bottom plate, a first fastening bolt passing through the first through hole is arranged in the first T-shaped positioning groove, and a first fastening nut is arranged on the first fastening bolt to fix the bottom plate; the upper surface of the bottom plate is provided with a second T-shaped positioning groove in an annular shape, the bottom of the A shaft head frame is provided with a second through hole, a second fastening bolt penetrating through the second through hole is arranged in the second T-shaped positioning groove, and a second fastening nut is arranged on the second fastening bolt to fix the A shaft head frame. By adopting the structure, the position of the A shaft head frame on the working panel can be adjusted, and the A shaft head frame and the bottom plate can be rotated to various angles for positioning so as to adapt to grinding processing of different angles.

Compared with the prior art, the invention has the following beneficial effects: the angle of the B-axis rotatable working panel can be accurately controlled by the grinding wheel seat rotating mechanism through the B-axis servo motor, the grinding angles of the plurality of grinding wheel sets can be controlled together through the B-axis servo motor, the grinding wheel seat rotating mechanism is suitable for grinding machining of various different grinding angles, the programming control difficulty is small, the distance between grinding wheels can be reduced, the structure is more compact, the machining consumption time is shortened, and the machining efficiency is remarkably improved.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.

Fig. 2 is a schematic overall front view structure diagram according to an embodiment of the present invention.

Fig. 3 is a schematic top view of the embodiment of the present invention.

Fig. 4 is a left side view schematically illustrating the whole structure of the embodiment of the present invention.

Fig. 5 is a schematic sectional view of the whole of the embodiment of the present invention.

Fig. 6 is an exploded view of the a-axis headstock and bedplate in accordance with an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a water tank assembly according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 7, a grinding wheel revolving gear of a numerical control tool grinder comprises a frame 1, wherein an X-axis rail 2 and a Y-axis rail 3 are arranged on the frame 1, which are perpendicular to each other, an X-axis pallet 21 is arranged on the X-axis rail 2, an X-axis working panel 28 is arranged on the X-axis pallet 21, an a-axis headstock 4 and a tailstock 5 are arranged on the X-axis working panel 28, a bottom plate 29 is arranged between the a-axis headstock 4 and the X-axis working panel 28, a first T-shaped positioning slot 281 is arranged on the X-axis working panel 28 along the direction of the X-axis rail 2, a first through hole 291 is arranged on the bottom plate 29, a first fastening bolt passing through the first through hole 291 is arranged in the first T-shaped positioning slot 281, and a first fastening nut is arranged on the first fastening bolt to fix, after the first nut is loosened, the bottom plate 29 can slide on the first T-shaped positioning slot 281, and the first nut is screwed at any position on the first T-shaped positioning slot 281 according to the processing requirement to fix the bottom plate 29.

The upper surface of the bottom plate 29 is provided with a second T-shaped positioning groove 292 in a circular ring shape, the bottom of the A spindle nose frame 4 is provided with a second through hole 43, a second fastening bolt penetrating through the second through hole 43 is arranged in the second T-shaped positioning groove 292, a second fastening nut is arranged on the second fastening bolt to fix the A spindle nose frame 4, the A spindle nose frame 4 can rotate on the bottom plate 29 after the second nut is unscrewed, and the A spindle nose frame 4 can be fixed on the bottom plate 29 by screwing the second nut at any angle according to the processing requirement.

The A-axis servo motor 41 and the flange plate 42 are arranged on the A-axis head frame 4, the flange plate 42 is driven by the A-axis servo motor 41, the A-axis servo motor 41 is fixed on the A-axis head frame 4, the A-axis servo motor 41 and the flange plate 42 are in synchronous belt transmission, the flange plate 42 is used for mounting an automatic centering clamp or a three-grab chuck, and the tail seat 5 is provided with an adjustable thimble 51; the adjustable thimble 51 adopts the structure among the prior art, is provided with X axle lead screw 22 along X axle line rail 2 direction in the X axle line rail 2, and X axle lead screw 22 and X axle layer board 21 bottom screw-thread fit, and X axle lead screw 22 is driven by X axle servo motor 23, and X axle servo motor 23 is fixed on frame 1, and X axle servo motor 23 passes through the shaft coupling and is connected with X axle lead screw 22.

Y axis rail 3 is last to be provided with Y axis layer board 31, is provided with Y axis lead screw 32 along the 3 directions of Y axis rail in the Y axis rail 3, and Y axis lead screw 32 and the threaded fit in Y axis layer board 31 bottom, and Y axis lead screw 32 is driven by Y axle servo motor 33, and Y axle servo motor 33 is fixed on frame 1, and Y axle servo motor 33 passes through the shaft coupling and is connected with Y axis lead screw 32.

The Y-axis supporting plate 31 is provided with a B-axis rotatable working panel 6, the Y-axis supporting plate 31 is provided with a B-axis assembly 61 in a rotating mode, the B-axis assembly 61 is driven by a B-axis servo motor 62, the top of the B-axis assembly 61 is connected with the B-axis rotatable working panel 6, in the embodiment, the B-axis servo motor 62 is fixed to the bottom of the Y-axis supporting plate 31, and the B-axis servo motor 62 and the B-axis assembly 61 are in transmission through a synchronous belt.

The B-axis rotatable working panel 6 is provided with a C-axis mounting seat 7, the C-axis mounting seat 7 is provided with a C-axis assembly 71, the C-axis assembly 71 is provided with a C-axis grinding wheel set 72, the C-axis assembly 71 is driven by a C-axis servo motor 73, the C-axis servo motor 73 is fixed on the B-axis rotatable working panel 6, and the C-axis servo motor 73 and the C-axis assembly 71 are in transmission through a synchronous belt.

A Z-axis rail 8 is further arranged on the C-axis mounting seat 7, a Z-axis supporting plate 81 is arranged on the Z-axis rail 8, a Z-axis lead screw 82 is arranged in the Z-axis rail 8 along the direction of the Z-axis rail 8, the Z-axis lead screw 82 is in threaded fit with the Z-axis supporting plate 81, and the Z-axis lead screw 82 is driven by a Z-axis servo motor 83; the Z-axis supporting plate 81 is provided with a D-axis grinding wheel set 91 in a rotating mode, the D-axis grinding wheel set 91 is driven by a D-axis servo motor 92, the D-axis servo motor 92 is fixed on the Z-axis supporting plate 81, and the D-axis servo motor 92 and the D-axis grinding wheel set 91 are in synchronous belt transmission.

The X-axis rail 2, the Y-axis rail 3 and the Z-axis rail 8 are perpendicular to each other, and the C-axis grinding wheel group 72 is perpendicular to the D-axis grinding wheel group 91. Carry out abrasive machining through C axle grinding wheel group 72 and D axle grinding wheelset 91, can carry out cylindrical grinding, screw thread grinding and cutter abrasive machining, remove through Z axle servo motor 83 control Z axle layer board 81, control D axle grinding wheel group 91's position, C axle grinding wheel group 72 and D axle grinding wheelset 91's distance is closer in the course of working, and the switching stroke is little, and switching efficiency is higher, promotes whole machining efficiency.

Frame 1 is last to be provided with cooling water conservancy diversion passageway 11 around X axis rail 2 and Y axis rail 3, cooling water conservancy diversion passageway 11 one side is provided with guide plate 12, guide plate 12 export below sets up circulating filter water tank assembly 10, be equipped with water pump 13 in the circulating filter water tank assembly 10, 13 exit linkage cooling water piping of water pump, circulating filter water tank assembly 10 has the filter screen 101 that three accessible particle reduces gradually along the rivers direction, the rear side at three filter screen 101 is installed to water pump 13. By adopting the structure, the grinding debris particles can be filtered, and can be classified and recycled according to the particle size, and the filtering efficiency is high.

An X-axis manual adjusting shaft 24 is rotatably arranged on the frame 1, a first bevel gear 25 and an X-axis scale hand wheel 26 are arranged on the X-axis manual adjusting shaft 24, a second bevel gear 27 is arranged on the X-axis screw rod 22, and the first bevel gear 25 is meshed with the second bevel gear 27. The X-axis screw 22 can be driven to rotate by rotating the X-axis scale hand wheel 26, so that the X-axis supporting plate 31 can be manually fed.

A Y-axis manual adjusting rotating shaft 34 is rotatably arranged on the rack 1, the Y-axis manual adjusting rotating shaft 34 and the upper Y-axis lead screw 32 are in synchronous belt transmission, and a Y-axis scale hand wheel 35 is arranged at one end of the Y-axis manual adjusting rotating shaft 34. The Y-axis screw 32 can be driven to rotate by rotating the Y-axis manual adjustment shaft 34, so that the Y-axis pallet 31 can be manually fed.

The numerical control tool grinding machine is provided with the C-axis grinding wheel group 72 and the D-axis grinding wheel group 91 which are perpendicular to each other, the controller controls the rotation of the X-axis servo motor 23, the Y-axis servo motor 33 and the Z-axis servo motor 83, the feeding speed can be conveniently and accurately controlled, the high-precision cylindrical grinding and tool machining can be realized at one time by matching the feeding amount in each direction, the machining such as thread grinding can be completed, the B-axis servo motor 62 can rotate the B-axis rotatable working panel 6, the grinding angles of the C-axis grinding wheel group 72 and the D-axis grinding wheel group 91 are adjusted, the grinding requirements of different angles are met, a plurality of formed grinding wheels can be simultaneously installed on the D-axis, and the end face cutting angle requirements and the chip groove guiding and machining requirements of any tool can be met by matching the A-axis servo motor.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a grinding wheel seat rotary mechanism of numerical control cutter grinding machine, includes frame (1), be equipped with mutually perpendicular's X axis rail (2) and Y axis rail (3) on frame (1), be provided with X axle layer board (21) on X axis rail (2), be provided with Y axle layer board (31), its characterized in that on Y axis rail (3): the automatic grinding machine is characterized in that a B-axis rotatable working panel (6) is arranged on the Y-axis supporting plate (31), the B-axis rotatable working panel (6) is provided with a C-axis mounting seat (7), a B-axis assembly (61) is arranged on the Y-axis supporting plate (31) in a rotating mode, the B-axis assembly (61) is driven by a B-axis servo motor (62), the top of the B-axis assembly (61) is connected with the B-axis rotatable working panel (6), a grinding wheel seat is arranged on the B-axis rotatable working panel (6), and at least two grinding wheel sets are arranged on the grinding wheel seat.

2. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 1, characterized in that: the B-axis servo motor (62) is fixed at the bottom of the Y-axis supporting plate (31), and the B-axis servo motor (62) and the B-axis assembly (61) are driven through a synchronous belt.

3. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 1, characterized in that: the grinding wheel seat comprises a C-axis mounting seat (7), a C-axis assembly (71) is arranged on the C-axis mounting seat (7), a C-axis grinding wheel set (72) is arranged on the C-axis assembly (71), and the C-axis assembly (71) is driven by a C-axis servo motor (73); a Z-axis linear rail (8) is further arranged on the C-axis mounting seat (7), a Z-axis supporting plate (81) is arranged on the Z-axis linear rail (8), a Z-axis lead screw (82) is arranged in the Z-axis linear rail (8) along the direction of the Z-axis linear rail (8), the Z-axis lead screw (82) is in threaded fit with the Z-axis supporting plate (81), and the Z-axis lead screw (82) is driven by a Z-axis servo motor (83); a D-axis grinding wheel set (91) is rotatably arranged on the Z-axis supporting plate (81), and the D-axis grinding wheel set (91) is driven by a D-axis servo motor (92); the X-axis line rail (2), the Y-axis line rail (3) and the Z-axis line rail (8) are perpendicular to each other, and the C-axis grinding wheel set (72) is perpendicular to the D-axis grinding wheel set (91).

4. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 1, characterized in that: the cooling water circulating and filtering device is characterized in that a cooling water guiding channel (11) is arranged on the rack (1) in a winding mode and is arranged on the X-axis rail (2) and the Y-axis rail (3), a guide plate (12) is arranged on one side of the cooling water guiding channel (11), a circulating and filtering water tank assembly (10) is arranged below an outlet of the guide plate (12), a water pump (13) is arranged in the circulating and filtering water tank assembly (10), and an outlet of the water pump (13) is connected with a cooling water pipeline.

5. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 4, characterized in that: the circulating filtering water tank assembly (10) comprises a plurality of filter screens (101) which can be gradually reduced by particles along the water flow direction.

6. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 1, characterized in that: an X-axis lead screw (22) is arranged in the X-axis linear rail (2) along the X-axis linear rail (2), the X-axis lead screw (22) is in threaded fit with the bottom of the X-axis supporting plate (21), and the X-axis lead screw (22) is driven by an X-axis servo motor (23); and a Y-axis screw rod (32) is arranged in the Y-axis track (3) along the Y-axis track (3) direction, the Y-axis screw rod (32) is in threaded fit with the bottom of the Y-axis supporting plate (31), and the Y-axis screw rod (32) is driven by a Y-axis servo motor (33).

7. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 6, characterized in that: an X-axis manual adjusting shaft (24) is arranged on the rack (1) in a rotating mode, a first bevel gear (25) and an X-axis scale hand wheel (26) are arranged on the X-axis manual adjusting shaft (24), a second bevel gear (27) is arranged on the X-axis lead screw (22), and the first bevel gear (25) is meshed with the second bevel gear (27).

8. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 6, characterized in that: rotate on frame (1) and be provided with Y axle hand regulation pivot (34), Y axle hand regulation pivot (34) with go up Y axle lead screw (32) and pass through synchronous belt drive, Y axle hand regulation pivot (34) one end is provided with Y axle scale hand wheel (35).

9. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 1, characterized in that: the X-axis supporting plate (21) is provided with an A-axis head frame (4) and a tail seat (5), the A-axis head frame (4) is provided with an A-axis servo motor (41) and a flange plate (42), the flange plate (42) is driven by the A-axis servo motor (41), and the tail seat (5) is provided with an adjustable ejector pin (51).

10. The wheel slide rotating mechanism of a cnc cutting grinder as set forth in claim 9, characterized in that: an X-axis working panel (28) is arranged on the X-axis supporting plate (21), a bottom plate (29) is arranged between the A-axis head frame (4) and the X-axis working panel (28), a first T-shaped positioning groove (281) is formed in the X-axis working panel (28) along the direction of an X-axis line rail (2), a first through hole (291) is formed in the bottom plate (29), a first fastening bolt penetrating through the first through hole (291) is arranged in the first T-shaped positioning groove (281), and a first fastening nut is arranged on the first fastening bolt to fix the bottom plate (29); the upper surface of the bottom plate (29) is provided with a second T-shaped positioning groove (292) in a ring shape, the bottom of the A shaft head frame (4) is provided with a second through hole (43), a second fastening bolt penetrating through the second through hole (43) is arranged in the second T-shaped positioning groove (292), and a second fastening nut is arranged on the second fastening bolt to fix the A shaft head frame (4).