CN112201141A - Teaching desktop type miniature five-axis linkage numerical control machine tool - Google Patents

Abstract

The invention relates to the technical field of numerical control machines, in particular to a teaching desktop type miniature five-axis linkage numerical control machine, which comprises a machine tool main body and a gantry support, wherein the upper end of the machine tool main body is fixedly connected with the gantry support, an X-axis mechanism is arranged on the gantry support, the X-axis mechanism comprises a ball screw, a nut, a stepping motor main body, a hollow optical axis main body and a rhombic bearing support seat, the inner wall of the gantry support is movably connected with the ball screw through a bearing, the ball screw is in threaded connection with the nut, one end of the gantry support is fixedly connected with a stepping motor base, and the stepping motor main body is arranged in the. The control system developed by the invention is relatively simple, has high cost performance, can restore the small five-axis equipment of the programming and operation principle of the five-axis machine tool to the maximum extent, can effectively arouse the learning interest of students in the aspect of teaching, and improves the teaching effect.

Description

Teaching desktop type miniature five-axis linkage numerical control machine tool

Technical Field

The invention relates to the technical field of numerical control machine tools, in particular to a teaching desktop type miniature five-axis linkage numerical control machine tool.

Background

The numerical control machine tool is developed for many years and is widely applied to industries such as an automatic production line, machining, a die, woodwork, furniture, artware and the like, compared with the traditional handicraft industry, the numerical control machine tool makes up a short plate of common machining to a great extent, not only improves the machining efficiency, but also reduces the risk and the machining cost, and different from the traditional three-axis numerical control machining equipment, the five-axis numerical control machine tool integrates high-precision, high-performance computer control and servo machining technology, is advanced manufacturing and machining equipment with high technological content, can be used for machining complex curved surfaces, has the advantages of large production flexibility, short production period, good stability and the like, but has high price and foreign technical monopoly, so that the popularization and the learning of the five-axis machining technology are greatly hindered, and therefore, the invention develops the small five-axis machine tool equipment with relatively simple control system, low manufacturing cost and can also reduce the programming and operation principles of the five-axis machining machine tool to the greatest extent .

Aiming at the market demand of a five-axis numerical control machine tool, the design provides a design scheme of an economical five-axis miniature numerical control machine tool, numerical control machining codes are converted into the output pulse number of each axis by means of software running on a PC (personal computer), and a pulse signal is output to a stepping motor driver through a parallel port of the computer to control the movement of a stepping motor, so that the movement of each axis is realized to finish machining.

Aiming at the development bottleneck and wide application prospect of the five-axis numerical control machining technology, the design firstly analyzes the system structure of the numerical control micro numerical control machine tool according to the current research and development situations of the domestic and foreign micro numerical control machine tools, combines the machining characteristics of five-axis linkage, and provides an economical design scheme of the five-axis micro numerical control machine tool.

Compared with millions of five-axis machining equipment on the market, the five-axis numerical control micro numerical control machine tool designed by the invention has the manufacturing cost of only one percent of the five-axis numerical control micro numerical control machine tool, and meanwhile, a relatively simple control system not only can conveniently learn the relevant principle of five-axis machining, but also is beneficial to the maintenance of the equipment, effectively solves the development bottleneck of the five-axis machining technology, and provides a wide development prospect for the localization of the five-axis technology. The five-axis numerical control miniature numerical control machine tool can be used for numerical control teaching of colleges and universities, course design of an electromechanical integrated system and a tool platform of a creative center, is also an important reference for scientific research design of colleges and universities, and can also be used as a research object for college student practice.

Disclosure of Invention

The invention aims to provide a teaching desktop type miniature five-axis linkage numerical control machine tool, which aims to solve the problems that the cost of five-axis machining equipment in the market is too high, the volume is too large, the movement is inconvenient, and the existing control system completely uses a control module of the machine to control, so that the reading of data and the understanding of the working principle are inconvenient, and therefore, the teaching demonstration is not suitable.

In order to achieve the purpose, the invention provides the following technical scheme: a teaching desktop type miniature five-axis linkage numerical control machine tool comprises a machine tool main body and a gantry support, wherein the upper end of the machine tool main body is fixedly connected with the gantry support, an X-axis mechanism is arranged on the gantry support, the X-axis mechanism comprises a ball screw, a nut, a stepping motor main body, a hollow optical axis main body and a rhombic bearing support seat, the inner wall of the gantry support is movably connected with the ball screw through a bearing, the nut is in threaded connection with the ball screw, one end of the gantry support is fixedly connected with a stepping motor base, the stepping motor main body is arranged in the stepping motor base, the stepping motor main body is connected with the ball screw through a coupler, the inner wall of the gantry support is movably connected with a hollow optical axis main body through a bearing, the outer surface of the hollow optical axis main body is slidably connected with an optical axis sliding block, and diamond-shaped bearing supporting seats matched with the hollow optical axis main body are arranged on two sides of the gantry support.

Preferably, the bottom end of the machine tool main body is provided with a Y-axis mechanism, one end of the Y-axis mechanism is connected with the X-axis through a screw hole, and the Y-axis mechanism and the X-axis mechanism are identical in structure.

Preferably, the front end of the X-axis mechanism is provided with a Z-axis mechanism, the Z-axis mechanism comprises a main shaft clamp, an air-cooled main shaft and a linear bearing, one end of the nut is fixedly connected with a fixed plate, one end, far away from the nut, of the fixed plate is fixedly connected with the air-cooled main shaft through the main shaft clamp, the outer surface of the air-cooled main shaft is fixedly connected with the main shaft clamp through the linear bearing, one end of the Z-axis mechanism is provided with another stepping motor base, and another stepping motor main body is arranged in the other stepping motor base.

Preferably, lathe main part one side is provided with A axle mechanism, A axle mechanism includes the support frame, the support frame has been linked firmly on lathe main part one side workstation, the support frame is "H" shape, the support frame comprises two risers and a diaphragm, diaphragm one end is provided with 42 step motor, the diaphragm other end is provided with synchronous pulley, one side riser inboard is provided with 57 step motor, synchronous pulley axle center has linked firmly another hollow optical axis main part, another hollow optical axis main part runs through the diaphragm and has linked firmly the grip block.

Compared with the prior art, the invention has the beneficial effects that:

1. high performance and low cost: different from the traditional three-axis numerical control machining equipment, the five-axis numerical control machine tool integrates high-precision and high-performance computer control and servo machining technology, is advanced manufacturing and machining equipment with high technological content, can be used for machining complex curved surfaces, and has the advantages of high production flexibility, short production period, good stability and the like, but the high price (more than millions at a glance) and foreign technical monopoly limit the popularization and learning of the five-axis linkage machining technology. The control system developed by the invention is relatively simple, has high cost performance, can restore the small five-axis equipment of the programming and operation principle of the five-axis machine tool to the maximum extent, can effectively arouse the learning interest of students in the aspect of teaching, and improves the teaching effect.

2. Convenient to use, simple structure: aiming at the market demand of the five-axis numerical control micro numerical control machine tool, the project provides a design scheme of an economical five-axis numerical control micro numerical control machine tool. The invention uses improved industrial numerical control operation software and typesetting processing software, converts numerical control processing codes into output pulse numbers of each shaft, outputs pulse signals to a stepping motor driver through a computer parallel port to control the movement of the stepping motor, thereby realizing the movement of each shaft to finish the processing, can process any curved surface and the processing demonstration of a composite process, is stable and reliable, has extremely simple operation, can be quickly learned and used by non-professionals, is suitable for being applied to the simple die industry, the seal industry and the artware processing industry, is suitable for the engraving and cutting processing of small objects, and can be used for the production and manufacturing of different industries, and also can be applied to the manufacturing of creative spaces, universities, office buildings, research institutes, laboratories, private workshops and the like.

3. The cost performance is high, and the application scope is wide: compared with millions of five-axis machining equipment on the market, the manufacturing cost of the five-axis numerical control micro numerical control machine tool designed by the project is only one percent of that of the five-axis machining equipment, and meanwhile, a relatively simple control system can conveniently learn the relevant principle of the five-axis machining, is beneficial to the maintenance of the equipment, effectively solves the development bottleneck of the five-axis machining technology, and provides a wide development prospect for the localization of the five-axis technology. The five-axis miniature numerical control machine tool designed by the project can be used for numerical control technology and principle teaching of colleges and universities, is also an important reference for scientific research design of colleges and universities, and can be used as a research object for university student innovative entrepreneur practice and an important scientific platform tool for university student entrepreneur centers, so the project has wide future market prospect.

Drawings

FIG. 1 is a right side elevational perspective view of the present invention;

FIG. 2 is a schematic diagram of the X-axis configuration of the present invention;

FIG. 3 is a schematic view of the Y-axis structure of the present invention;

FIG. 4 is a schematic view of the Z-axis structure of the present invention;

FIG. 5 is an A/C shaft motor and transmission support of the present invention;

FIG. 6 is a schematic view of the A/C axis structure of the present invention;

FIG. 7 is a power supply circuit layout of the present invention;

FIG. 8 is a control board I/O wiring diagram of the present invention;

FIG. 9 is a diagram of the drive train of the present invention;

FIG. 10 is a MACH3 interface board port design of the present invention;

FIG. 11 is an electrical layout of the present invention;

FIG. 12 is a diagram of an electrical cabinet interface design of the present invention;

FIG. 13 is a pictorial representation of the present invention;

FIG. 14 is a schematic of the X, Y, Z and A/C axes of the present invention.

In the figure: 110. a machine tool main body; 120. a gantry support; 210. a ball screw; 220. a nut; 230. a stepping motor main body; 231. a stepping motor base; 232. a coupling; 240. a hollow optic axis body; 241. an optical axis slider; 250. a rhombic bearing supporting seat; 310. a main shaft clamp; 320. an air-cooled main shaft; 330. a linear bearing; 410. a support frame; 420. 42 a stepping motor; 430. a synchronous pulley; 440. 57 a stepper motor; 450. and (4) clamping the plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-14, an embodiment of the present invention is shown: a teaching desktop type miniature five-axis linkage numerical control machine tool comprises a machine tool main body 110 and a gantry support 120, wherein the gantry support 120 is fixedly connected to the upper end of the machine tool main body 110, an X-axis mechanism is arranged on the gantry support 120, the X-axis mechanism comprises a ball screw 210, a nut 220, a stepping motor main body 230, a hollow optical axis main body 240 and a diamond-shaped bearing support seat 250, the inner wall of the gantry support 120 is movably connected with the ball screw 210 through a bearing, the nut 220 is connected to the ball screw 210 in a threaded manner, one end of the gantry support 120 is fixedly connected with a stepping motor seat 231, the stepping motor main body 230 is arranged in the stepping motor seat 231, the stepping motor main body 230 is connected with the ball screw 210 through a coupler 232, the inner wall of the gantry support 120 is movably connected with the hollow optical axis main body 240 through a bearing, the two groups of hollow optical axis main bodies 240 are symmetrically designed about the ball screw 210, diamond-shaped bearing supporting seats 250 matched with the hollow optical axis main bodies 240 are arranged on two sides of the gantry support 120, the X-axis stepping motor adopts a 57-step motor, the model of the X-axis stepping motor is 57FH13-03 with the torque of 1.35N.M according to the parameter range, and if the stepping motor needs to work normally, the current of a driver of the stepping motor needs to be set to be 2.0A. When the stepping motor receives the pulse, the ball screw is driven to rotate by the coupler connected with the stepping motor, and finally the movement of the X-axis sliding table is converted. What chooseed in the design is 1605 ball, and its helical pitch is 5mm, and step motor step angle is 1.8, then step motor rotation 1 week need 360/1.8 be 200 pulses for, in order to improve control accuracy, step motor need open and divide the function, sets up to 16 in the step motor driver and divides, then needs 200 to expect 16 pulses 3200 for, step motor passes through the shaft coupling promptly and drives lead screw operation a week, X axle slip table displacement 5 mm. According to the calculation of formula 1, when the stepping motor receives one pulse, the displacement d of the X-axis sliding table is as follows:

the bottom of the machine tool main body 110 is provided with a Y-axis mechanism, one end of the Y-axis mechanism is connected with an X-axis through a screw hole, the Y-axis mechanism is the same as the X-axis mechanism in structure, the Y-axis is positioned at the bottom of the workbench of the miniature numerical control machine tool, and the Y-axis is connected with the X-axis structure through a countersunk head screw hole on the side edge of a Y-axis sliding table and plays a supporting role in the whole structure. Considering that the gantry support is lengthened due to the addition of an AC shaft in a five-shaft structure, in order to ensure the stability during machining, the height of front and rear panels of a Y shaft is designed to be as small as possible, so that the center of gravity of the gantry support can be reduced through a frame, the machining is more stable, and finally, a structure that a Y shaft sliding table is arranged on the upper portion and a sliding block is arranged on the lower portion is selected, as shown in the figure. The Y-axis structure is basically the same as the X-axis structure and comprises a workbench, a ball screw, a nut, an optical axis, a sliding block, a 57 stepping motor, a coupler, a bracket, a front panel, a rear panel and the like. The front panel and the rear panel of the Y axis are connected through 5 1560 aluminum profiles with the length of 450mm, and T-shaped grooves in the aluminum profiles can be used for clamping workpieces and installing various tool fixtures. In order to reduce the vibration generated during the high-speed cutting of the spindle of the miniature numerical control machine tool, foot pad mounting holes are designed on the front panel and the rear panel.

The front end of the X-axis mechanism is provided with a Z-axis mechanism, the Z-axis mechanism comprises a main shaft clamp 310, an air-cooled main shaft 320 and a linear bearing 330, one end of a nut 220 is fixedly connected with a fixing plate, one end, far away from the nut 220, of the fixing plate is fixedly connected with the air-cooled main shaft 320 through the main shaft clamp 310, the outer surface of the air-cooled main shaft 320 is fixedly connected with the main shaft clamp 310 through the linear bearing 330, one end of the Z-axis mechanism is provided with another stepping motor base 231, another stepping motor main body 230 is arranged in the other stepping motor base 231, the stepping motor is the same as the Y-axis, the size of the Z-axis structure can influence the effective stroke of the X-axis and the Z-axis, and therefore a linear. Similarly, in order to save the space of the panel on the Z axis, the diamond-shaped supporting seat originally used on the XY axis is replaced by a hollow optical axis with internal tapping, and the supporting seat is fixed by an M8 hexagon socket head cap screw. The length and the width of the Z-axis sliding block are shortened, the Z-axis structure designed in the way is more compact, the X-axis space and the Z-axis space can be utilized to the maximum extent, and meanwhile, the Z-axis sliding block has a certain attractive degree. Finally, because there are a large amount of pieces and powder entering Z axle construction during the sculpture, lead to appearing the abnormal sound, the production of transmission efficiency decline scheduling problem, added organ formula dust cover in Z axle construction and can effectively avoid the production of this type of problem.

Machine tool main part 110 one side is provided with A axle mechanism, A axle mechanism includes support frame 410, support frame 410 has been linked firmly on the workstation of machine tool main part 110 one side, support frame 410 is "H" shape, support frame 410 comprises two risers and a diaphragm, diaphragm one end is provided with 42 step motor 420, the diaphragm other end is provided with synchronous pulley 430, one side riser inboard is provided with 57 step motor 440, synchronous pulley 430 axle center has linked firmly another hollow optical axis main part 240, another hollow optical axis main part 240 runs through the diaphragm and has linked firmly grip block 450, need bear the quality of partial cradle type five-axis structure when A axle rotates, consequently, the during operation needs great torque drive, so select 57 step motor as the power supply of A axle. Because the motor power is torque speed, the torque output is larger when the speed is slower under the condition of constant output power, but under the condition of constant speed, if the torque is increased, the current output by a stepping motor driver can only be increased under a rated condition, according to the parameter requirement, a planetary reducer or a synchronous belt speed reduction structure can be selected as the A-shaft speed reduction structure, from the practical point of view, if the planetary reducer is selected, the precision and the speed reduction ratio of the A-shaft speed reduction structure are far better than those of the synchronous belt speed reduction structure, but the factors of economy, convenience in manufacturing and the like are considered, and the synchronous belt is selected as the speed reduction mechanism in the design of the A-shaft. The synchronous belt integrates the advantages of belt transmission, chain transmission and gear transmission, but certain pretightening force needs to be applied for pretightening during installation, tensioning by a tensioning wheel can be adopted or the distance between shafts can be designed to be adjustable, in the design, a fixing plate for fixing the synchronous belt pulley is designed to be in a form that one end is fixed and the other end is adjustable, and four straight notches are additionally arranged on the basis of a fixed through hole of a stepping motor phi 5, as shown in figure 7, the synchronous belt pulley can be installed and tensioned only by adjusting the position of the stepping motor. The synchronous belt speed reduction ratio adopted in the design is 1: 6. The C-axis structure is arranged on the A axis and comprises a synchronous belt pulley, a stepping motor, a workbench, an optical axis and the like. The C-axis rotating shaft is fixed on the diamond-shaped bearing support seat and only needs to bear the mass of a workpiece and a clamp thereof, so that the torque required during rotation is very small, and the C-axis only needs to select a 42 stepping motor as a power source, so that a larger workbench can be installed, and the volume of the C-axis can be reduced. According to the parameter design requirement, a 42 stepping motor with the model number of 42FHO2-01 is selected, and in order to enable the C-axis stepping motor to work normally, the current of a C-axis stepping motor driver is set to be 1A. The speed reducer selected by the shaft C is the same as the shaft A, and is also used for reducing speed by a synchronous belt, and the speed reduction ratio is 1: 6. The AC axis configuration is shown in fig. 6.

For a, C diaxon, the step angle of the selected stepping motor is 1.8 °, and at this time, the stepping motor rotates one circle, and 360/1.8 pulses are required to be received, that is, the stepping motor rotates one circle every 200 steps. The reduction ratio i of the turntable is 6. In order to make the angle of rotation of the stepping motor after obtaining the pulse in the setting divisible, the driver of the stepping motor is preferably set to 4 subdivisions, and three decimal places are taken in the software setting. The control precision is improved by four times, and according to the formula 2, the rotating angle of two shafts is that the numerical control system outputs one pulse A, B:

i.e. the stepper motor rotates 0.075 degrees for each pulse received.

According to design requirements, the electrical structure and the mechanical structure are mutually independent and are connected through a data line and a connector when in use, and in order to make the structure compact and attractive, various electrical elements such as an interface board and a stepping motor are driven to be independently placed and orderly arranged in a control box. The requirements are met, firstly, the specification of the electrical element needs to be researched, the working principle of each electrical component needs to be researched, a simple and clear electrical loop diagram is drawn, secondly, a sheet metal box needs to be designed, and each component needs to be reasonably distributed according to the electrical principle. And finally, opening holes on the box body according to the appearance size of the element, and finishing and drawing a box body processing diagram.

In order to improve the stability of a machine tool system, two switching power supplies which work stably need to be installed in an electrical structure, wherein the 24V switching power supply supplies voltage to various interfaces and stepping motor drivers on a main control board, and the 36V switching power supply supplies power to a spindle motor. In order to enable various components to work normally, a sufficient allowance is reserved by calculating power consumption of each part of system, and the switching power supply is selected from a model with rated current larger than 5A. The power supply circuit after the design is finished is shown in figure 9.

In the design of an electrical system, a general MACH3 interface board with relatively stable performance is selected as a control system for the movement of the miniature numerical control machine tool. The use of the MACH3 control approach has several advantages as follows:

(1) five-axis linkage machining can be controlled by a computer.

(2) The output port of the relay is integrated, and the relay does not need to be matched for use.

(3) The voltage output port with analog 0-10v can be used together with a main shaft control board provided with an analog port, and 17 parallel pins can be used.

(4) When the external circuit is abnormal, the photoelectric coupler can isolate the external circuit, so that the external circuit cannot be damaged, switch interfaces such as tool setting, limiting and emergency stop are integrated on a board, and VB script program development is used in the macro 3 software.

(5) Compared with single chip microcomputer control, programs do not need to be developed, and the G codes can be executed by MACH3 software for PC control.

In the design, a control signal for driving the stepping motor is transmitted to the stepping motor driver through a parallel port of the PC so as to control the movement of the miniature numerical control machine, and a schematic diagram of controlling the movement of the machine tool through a parallel port data line by the PC is shown in FIG. 9.

This design adopts independent step motor driver, though the structure is not as simple as integrated in the control card, also can increase the complexity of wiring, but the advantage lies in can conveniently change when the trouble appears. The motion of the stepping motor needs to receive two signals, wherein one signal is a pulse signal, the other signal is a direction signal, the pulse signal controls the motion, and the direction signal controls the steering. The principle that the PC drives the stepping motor through the parallel port is as follows: the pulse and direction signal output by PC machine can be passed through power amplifier to drive step motor, finally the miniature numerical control machine can be moved. The characteristics of the parallel port signal are taken into account when distributing the ports and the pins. Because some output ports have other special functions besides being used as pulse output, in order to enable the five-axis numerically controlled micro numerical control machine tool to operate normally, when the ports and pins are distributed, the special ports need to be ensured to be unoccupied. With proper allocation, the port configuration of the MACH3 control panel is shown in FIG. 10.

The back of the electrical control box of the miniature numerical control machine tool is provided with a power switch, a fuse, a power indicator lamp, a socket and an aviation plug, and the positions of a USB and a parallel port are required to be reserved in addition for connecting the control box with a computer. The front of the electric control box needs to be provided with a main shaft speed regulating knob, a duplex switch is used for switching manual speed regulation and G code speed regulation, and in addition, an emergency stop button is also needed to be arranged, so that equipment can be quickly and effectively controlled to stop when danger occurs. The components and parts in the electric control box are arranged clearly and reasonably, and the use of the maximized space is ensured under the precondition of heat dissipation. Fig. 11 is a design drawing of electrical control of the micro numerical control machine tool, and the design of the electrical cabinet interface is shown in fig. 12.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (4)

1. Teaching type desktop formula miniature five-axis linkage digit control machine tool, including lathe main part (110) and gantry support (120), its characterized in that: the upper end of the machine tool main body (110) is fixedly connected with a gantry support (120), the gantry support (120) is provided with an X-axis mechanism, the X-axis mechanism comprises a ball screw (210), a nut (220), a stepping motor main body (230), a hollow optical axis main body (240) and a rhombic bearing support seat (250), the inner wall of the gantry support (120) is movably connected with the ball screw (210) through a bearing, the ball screw (210) is in threaded connection with the nut (220), one end of the gantry support (120) is fixedly connected with a stepping motor seat (231), the stepping motor main body (230) is arranged in the stepping motor seat (231), the stepping motor main body (230) is connected with the ball screw (210) through a coupler (232), the inner wall of the gantry support (120) is movably connected with the hollow optical axis main body (240) through a bearing, and the outer surface of the hollow optical axis main body (, the two groups of hollow optical axis main bodies (240) are symmetrically designed about the ball screw (210), and diamond-shaped bearing supporting seats (250) matched with the hollow optical axis main bodies (240) are arranged on two sides of the gantry support (120).

2. The teaching type desktop type miniature five-axis linkage numerical control machine tool according to claim 1, characterized in that: the bottom end of the machine tool main body (110) is provided with a Y-axis mechanism, one end of the Y-axis mechanism is connected with an X-axis through a screw hole, and the Y-axis mechanism and the X-axis mechanism are identical in structure.

3. The teaching type desktop type miniature five-axis linkage numerical control machine tool according to claim 1, characterized in that: x axle mechanism front end is provided with Z axle mechanism, Z axle mechanism includes main shaft clamp (310), air-cooled main shaft (320) and linear bearing (330), nut (220) one end fixedly connected with fixed plate, and the one end that nut (220) were kept away from to the fixed plate has linked firmly air-cooled main shaft (320) through main shaft clamp (310), air-cooled main shaft (320) surface links firmly with main shaft clamp (310) through linear bearing (330), Z axle mechanism one end is provided with another step motor seat (231), and is provided with another step motor main part (230) in another step motor seat (231).

4. The teaching type desktop type miniature five-axis linkage numerical control machine tool according to claim 1, characterized in that: lathe main part (110) one side is provided with A axle mechanism, A axle mechanism includes support frame (410), support frame (410) have been linked firmly on lathe main part (110) one side workstation, support frame (410) are "H" shape, support frame (410) comprise two risers and a diaphragm, diaphragm one end is provided with 42 step motor (420), the diaphragm other end is provided with synchronous pulley (430), one side riser inboard is provided with 57 step motor (440), synchronous pulley (430) axle center has linked firmly another hollow optical axis main part (240), another hollow optical axis main part (240) run through the diaphragm and have linked firmly grip block (450).

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