阅读说明：本技术 一种多连体涡轮切割装置及切割方法 (Multi-connected turbine cutting device and cutting method ) 是由 勇铁军 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种多连体涡轮切割装置及切割方法,切割装置包括基板和设置在基板上的左基座和右基座,左基座上安装有分度盘,分度盘上安装有三爪自定心卡盘,右基座上安装有伸缩套筒,伸缩套筒的前端安装有旋转顶针,旋转顶针为改制型旋转顶针,改制型旋转顶针的前端被削平并在旋转顶针的前端外圆位置安装有三个浮动支撑缸,浮动支撑缸的前端顶头指向左基座方向；分度盘的回转轴线与旋转顶针的旋转轴线同轴；装夹时多连体涡轮的中间轴的平头端外圆通过三爪自定心卡盘定位夹紧,多连体涡轮的中间轴的球头端通过三个浮动支撑缸实现三点式浮动顶住并锁紧,多连体涡轮旁设置有砂轮机。本发明实现了多连体涡轮的高效自动化切割。(The invention discloses a multi-connected turbine cutting device and a cutting method, wherein the cutting device comprises a substrate, a left base and a right base which are arranged on the substrate, a dividing plate is arranged on the left base, a three-jaw self-centering chuck is arranged on the dividing plate, a telescopic sleeve is arranged on the right base, a rotary thimble is arranged at the front end of the telescopic sleeve, the rotary thimble is a modified rotary thimble, the front end of the modified rotary thimble is flattened, three floating support cylinders are arranged at the excircle positions of the front end of the rotary thimble, and the top of the front end of each floating support cylinder points to the direction of the left base; the rotary axis of the dividing plate is coaxial with the rotary axis of the rotary thimble; when in clamping, the outer circle of the butt end of the intermediate shaft of the multi-connected turbine is positioned and clamped through the three-jaw self-centering chuck, the ball end of the intermediate shaft of the multi-connected turbine realizes three-point floating propping and locking through the three floating supporting cylinders, and a grinding wheel machine is arranged beside the multi-connected turbine. The invention realizes the high-efficiency automatic cutting of the multi-connected turbine.)

1. The multi-connected turbine cutting device is characterized by comprising a workpiece positioning and fixing tool and a grinding wheel moving and cutting tool, wherein the workpiece positioning and fixing tool comprises a base plate, a left base and a right base which are arranged on the base plate, an index plate facing to the direction of the right base is arranged on the left base, a three-jaw self-centering chuck is arranged on the index plate, a telescopic sleeve pointing to the direction of the left base is arranged on the right base, a rotating ejector pin is arranged at the front end of the telescopic sleeve, the rotating ejector pin is a modified rotating ejector pin, the front end of the modified rotating ejector pin is flattened, three floating support cylinders are arranged at the excircle positions of the front ends of the rotating ejector pins, and the top ends of the floating support cylinders point to the direction of the left base; the rotary axis of the dividing plate is coaxial with the rotary axis of the rotary thimble; during clamping, the outer circle of the butt end of the intermediate shaft of the multi-connected turbine is positioned and clamped through the three-jaw self-centering chuck, and the blank surface of the ball head end of the intermediate shaft of the multi-connected turbine realizes three-point floating propping and locking through the three floating supporting cylinders; the grinding wheel moving and cutting tool comprises a grinding wheel machine movably arranged beside the multi-connected turbine.

2. The multiple connected turbine cutting device according to claim 1, wherein three support legs extending toward the left base are further arranged at an outer circle position of the front end of the rotating ejector pin, the front ends of the three support legs are commonly connected with a pre-positioning ring, an annular groove is formed in an inner hole of the pre-positioning ring, an annular hollow air ring is installed in the annular groove, and the annular hollow air ring is connected with a compressed air source through a compressed air pipeline and an electromagnetic valve arranged on the compressed air pipeline.

3. The multiple turbine cutting device according to claim 1, wherein the grinding wheel moving and cutting tool further comprises a linear guide rail fixedly arranged on the base plate and close to one side of the multiple turbine, and a grinder mounting seat movably arranged on the linear guide rail, wherein the grinder mounting seat is driven by a lead screw connected with the grinder mounting seat and a speed reduction servo motor connected with the lead screw to realize the movement of the grinder along the direction of the linear guide rail during cutting.

4. The multiple-connected turbine cutting device according to claim 3, wherein a pull pressure sensor is connected in series with a connection part of an output shaft of the speed reduction servo motor on the screw rod, and the speed reduction servo motor and the pull pressure sensor are respectively connected with a control system; during cutting, the control system dynamically adjusts the feeding speed according to the screw rod propelling force detected by the tension and pressure sensor, so that the screw rod propelling force is kept constant or does not exceed a preset value, and the cutting force controlled variable-speed cutting is realized.

5. The multiple-connected turbine cutting device according to claim 4, wherein an elastic cushion pad is connected in series with a connection part of the screw rod and an output shaft of the speed reduction servo motor.

6. The multiple connected turbine cutting device according to claim 1, wherein three semicircular unfilled circular positioning holes are formed in the outer circle of the rotating ejector pin, and the floating support cylinder is installed and positioned in the unfilled circular positioning holes; the three floating support cylinders are connected with the hydraulic station.

7. The multiple-connected turbine cutting device according to claim 1, wherein the telescopic sleeve is of a tailstock sleeve structure of a horizontal lathe; the index plate is a numerical control index plate; a section of arc-shaped bent steel wire which is tightly attached to and protrudes out of the clamping face of the clamping jaw is welded on the clamping face of the clamping jaw of the three-jaw self-centering chuck, and the plane of the arc-shaped bent steel wire is perpendicular to the rotary central axis of the dividing plate.

8. The multiple turbine cutting device according to claim 1, wherein the lower end of the base plate is supported on a frame, and the upper end of the base plate is provided with a combined movable transparent shield which covers the grinder when moving to the periphery of the multiple turbine; and an organ type guide rail cover is arranged on the linear guide rail.

9. The multi-connected turbine cutting device according to claim 1, wherein a dust hood is connected to the lower end of the base plate, a plurality of dust suction holes communicated with the dust hood are formed in the base plate, and the dust hood is connected with a dust collector through a dust suction pipeline; the compressed air source is an air pump, and an electric air release valve is arranged on the compressed air pipeline.

10. A cutting method using the device for multiple turbine cutting according to claims 1 to 9, characterized in that it comprises the following steps:

(1) workpiece installation: opening the combined movable transparent shield, and clamping the workpiece; during clamping, firstly positioning the outer circle of the ball end of the intermediate shaft of the multi-connected turbine, then clamping the outer circle of the butt end of the intermediate shaft of the multi-connected turbine through a three-jaw self-centering chuck, and finally realizing three-point floating propping and locking on the blank surface of the ball end of the intermediate shaft of the multi-connected turbine through the three floating supporting cylinders; when the outer circle of the ball end of the middle shaft of the multi-connected turbine is clamped, the outer circle of the ball end of the middle shaft of the multi-connected turbine is inserted into the inner hole of the annular hollow air ring, and compressed air is filled into the annular hollow air ring to enable the inner hole of the annular hollow air ring to shrink uniformly so as to realize pre-positioning of the outer circle of the ball end of the middle shaft of the multi-connected turbine; after clamping is finished, the combined movable transparent shield is closed;

(2) cutting a workpiece: the control system starts a dust collector, simultaneously starts a grinding machine to rotate, starts a speed-reducing servo motor connected with the screw rod to drive the grinding machine to move along the direction of the linear guide rail, and cuts off a plurality of turbines positioned on the same side of the middle shaft by a grinding wheel of the grinding machine in the moving process;

(3) transposition and cutting: the control system drives the numerical control dividing plate to rotate by an angle, and the turbine on the side, which is not cut, of the middle shaft rotates to a cutting position and then is cut by the grinding wheel machine;

(4) taking out the workpiece: and (4) repeating the step (3) to cut until the turbines at all the angle positions on the intermediate shaft are cut, closing the grinding machine, opening the combined movable transparent shield, and taking out the turbines and the intermediate shaft.

Technical Field

The invention relates to the technical field of turbine manufacturing, in particular to a multi-connected turbine cutting device and a cutting method.

Background

The manufacture of the small and medium-sized turbine is usually cast and formed by adopting a multi-connected lost wax casting method, and a plurality of blank turbines are connected to an intermediate shaft which is originally used as a casting crucible after casting; the turbines are arranged on the outer circle of the intermediate shaft in a straight line along the axial direction and are arranged at intervals, and a plurality of rows of turbine groups are arranged on the outer circle of one intermediate shaft to form the multi-connected turbine. One end of the intermediate shaft is provided with a ball head, and the other end of the intermediate shaft is a flat opening, and the specific structure of the intermediate shaft is a multi-connected turbine 10 in a figure 2.

The multiple turbine body is required to be cut from the intermediate shaft after casting. The cutting method of the multi-connected turbine in the prior art comprises the following steps: firstly fix a position the concatemer turbine through dedicated location frock to compress tightly fixedly with the clamp plate, then hand-held grinder cuts the concatemer turbine one by one, and the transposition of turning over after need loosen the concatemer turbine on dedicated frock many times during, then compress tightly with the clamp plate again, cut again, its drawback of bringing is: the operation is troublesome, the cutting precision is poor, the cutting efficiency is low, and the safety is poor.

In view of the above, there is a need to improve the existing multiple turbine cutting technology to overcome the above drawbacks.

Disclosure of Invention

In order to solve the problems, the invention provides a multi-connected turbine cutting device, which aims to realize efficient and automatic cutting of a multi-connected turbine, improve the cutting precision and quality and improve the safety of cutting operation. The specific technical scheme is as follows:

a multi-connected turbine cutting device comprises a workpiece positioning and fixing tool and a grinding wheel moving and cutting tool, wherein the workpiece positioning and fixing tool comprises a base plate, a left base and a right base which are arranged on the base plate, an index plate facing the direction of the right base is arranged on the left base, a three-jaw self-centering chuck is arranged on the index plate, a telescopic sleeve pointing to the direction of the left base is arranged on the right base, a rotating ejector pin is arranged at the front end of the telescopic sleeve, the rotating ejector pin is a reformed rotating ejector pin, the front end of the reformed rotating ejector pin is flattened, three floating support cylinders are arranged at the outer circle position of the front end of the rotating ejector pin, and the top of the front end of each floating support cylinder points to the direction of the left base; the rotary axis of the dividing plate is coaxial with the rotary axis of the rotary thimble; during clamping, the outer circle of the butt end of the intermediate shaft of the multi-connected turbine is positioned and clamped through the three-jaw self-centering chuck, and the blank surface of the ball head end of the intermediate shaft of the multi-connected turbine realizes three-point floating propping and locking through the three floating supporting cylinders; the grinding wheel moving and cutting tool comprises a grinding wheel machine movably arranged beside the multi-connected turbine.

Preferably, the three floating support cylinders are uniformly arranged at the outer circle position of the front end of the rotating thimble along the circumferential direction.

As a further improvement of the invention, the outer circle position of the front end of the rotating thimble is further provided with three support legs extending towards the left base, the front ends of the three support legs are connected with a pre-positioning ring together, an annular groove is arranged in an inner hole of the pre-positioning ring, an annular hollow air ring is installed in the annular groove, and the annular hollow air ring is connected with a compressed air source through a compressed air pipeline and an electromagnetic valve arranged on the compressed air pipeline.

The grinding wheel moving and cutting tool further comprises a linear guide rail fixedly arranged on the base plate and close to one side of the multi-connected turbine, and a grinding machine mounting seat movably arranged on the linear guide rail, wherein the grinding machine mounting seat is driven by a lead screw connected with the grinding machine mounting seat and a speed reduction servo motor connected with the lead screw to realize the movement of a grinding machine along the direction of the linear guide rail during cutting.

As a further improvement of the invention, a tension and pressure sensor is connected in series with the output shaft connecting part of the speed reducing servo motor on the screw rod, and the speed reducing servo motor and the tension and pressure sensor are respectively connected with a control system; during cutting, the control system dynamically adjusts the feeding speed according to the screw rod propelling force detected by the tension and pressure sensor, so that the screw rod propelling force is kept constant or does not exceed a preset value, and the cutting force controlled variable-speed cutting is realized.

Preferably, an elastic cushion pad is connected in series with a connecting part of the screw rod and an output shaft of the speed reduction servo motor.

The elastic buffer cushion can play a role in buffering when a grinding wheel of the grinding machine just contacts with a workpiece, so that the service life of the grinding wheel is protected and prolonged, and the cutting safety is improved.

Preferably, the outer circle of the rotating thimble is provided with three semicircular unfilled circular positioning holes, and the floating support cylinder is installed and positioned in the unfilled circular positioning holes; the three floating support cylinders are connected with the hydraulic station.

The arrangement of the circle-lacking positioning hole meets the installation requirement of the floating support cylinder on one hand, and the external connection of an oil way on the floating support cylinder is facilitated on the other hand.

In the invention, the telescopic sleeve adopts a tailstock sleeve structure of a horizontal lathe; the index plate is a numerical control index plate; a section of arc-shaped bent steel wire which is tightly attached to and protrudes out of the clamping face of the clamping jaw is welded on the clamping face of the clamping jaw of the three-jaw self-centering chuck, and the plane of the arc-shaped bent steel wire is perpendicular to the rotary central axis of the dividing plate.

Preferably, the lower end of the base plate is supported on the frame, the upper end of the base plate is provided with a combined movable transparent shield, and the combined movable transparent shield covers the grinder when moving to the periphery of the multi-connected turbine; and an organ type guide rail cover is arranged on the linear guide rail.

Preferably, the lower end of the base plate is connected with a dust hood, a plurality of dust absorption holes communicated with the dust hood are formed in the base plate, and the dust hood is connected with a dust collector through a dust absorption pipeline; the compressed air source is an air pump, and an electric air release valve is arranged on the compressed air pipeline and used for releasing the compressed air in the annular hollow air ring when the workpiece is unloaded.

A cutting method of a multi-connected turbine cutting device comprises the following steps:

(1) workpiece installation: opening the combined movable transparent shield, and clamping the workpiece; during clamping, firstly positioning the outer circle of the ball end of the intermediate shaft of the multi-connected turbine, then clamping the outer circle of the butt end of the intermediate shaft of the multi-connected turbine through a three-jaw self-centering chuck, and finally realizing three-point floating propping and locking on the blank surface of the ball end of the intermediate shaft of the multi-connected turbine through the three floating supporting cylinders; when the outer circle of the ball end of the middle shaft of the multi-connected turbine is clamped, the outer circle of the ball end of the middle shaft of the multi-connected turbine is inserted into the inner hole of the annular hollow air ring, and compressed air is filled into the annular hollow air ring to enable the inner hole of the annular hollow air ring to shrink uniformly so as to realize pre-positioning of the outer circle of the ball end of the middle shaft of the multi-connected turbine; after clamping is finished, the combined movable transparent shield is closed;

(2) cutting a workpiece: the control system starts a dust collector, simultaneously starts a grinding machine to rotate, starts a speed-reducing servo motor connected with the screw rod to drive the grinding machine to move along the direction of the linear guide rail, and cuts off a plurality of turbines positioned on the same side of the middle shaft by a grinding wheel of the grinding machine in the moving process;

(3) transposition and cutting: the control system drives the numerical control dividing plate to rotate by an angle, and the turbine on the side, which is not cut, of the middle shaft rotates to a cutting position and then is cut by the grinding wheel machine;

(4) taking out the workpiece: and (4) repeating the step (3) to cut until the turbines at all the angle positions on the intermediate shaft are cut, closing the grinding machine, opening the combined movable transparent shield, and taking out the turbines and the intermediate shaft.

The invention has the beneficial effects that:

firstly, the cutting device and the cutting method of the multi-connected turbine adopt the specially designed modified rotating ejector pin, the clamping adaptability of the multi-connected turbine middle shaft to the blank surface of the ball head end is good, and compared with the conventional ejector pin clamping, a process of machining a center hole can be reduced, so that the work efficiency is improved.

Secondly, the multi-connected turbine cutting device and the cutting method provided by the invention are provided with the annular hollow air ring, so that the blank excircle of the multi-connected turbine can be uniformly pre-positioned, and the positioning precision is improved.

Thirdly, the device and the method for cutting the multi-connected turbine adopt a combined clamping mode that a three-jaw self-centering chuck at one end of a numerical control dividing plate and a three-point floating propping and locking of a modified rotating thimble at the other end, have good clamping rigidity, can realize the cutting of all turbines of the multi-connected turbine under one-time clamping, and have good automation degree and high cutting efficiency.

Fourthly, according to the multi-connected turbine cutting device and the cutting method, the connecting part of the speed reduction servo motor which drives the grinding machine to feed for cutting and feeding and the screw rod is connected with the pull pressure sensor in series, so that the control system can dynamically adjust the feeding speed according to the screw rod propelling force detected by the pull pressure sensor, the screw rod propelling force is ensured to be constant or not to exceed a preset value, and therefore the variable-speed cutting with the controlled cutting force is realized, the cutting operation is stable and reliable, and the safety is good.

Drawings

FIG. 1 is a schematic structural view of a multiple turbine cutting apparatus of the present invention;

FIG. 2 is a top view of FIG. 1;

fig. 3 and 4 are partial enlarged views of fig. 2.

In the figure: 1. the device comprises a base plate, 2, a left base, 3, a right base, 4, an index plate, 5, a three-jaw self-centering chuck, 6, a telescopic sleeve, 7, a rotating thimble, 8, a floating support cylinder, 9, a multi-connected turbine, 10, an intermediate shaft, 11, a ball head end of the intermediate shaft, 12, a grinding machine, 13, a support leg, 14, a pre-positioning ring, 15, an annular hollow air ring, 16, a linear guide rail, 17, a grinding machine mounting seat, 18, a screw rod, 19, a speed-reducing servo motor, 20, a tension pressure sensor, 21, an elastic cushion pad, 22, a circle-lacking positioning hole, 23, an arc-shaped bent steel wire, 24, a rack, 25, a combined movable transparent shield, 26, a dust hood, 27, a dust suction hole, 28, a dust collector, 29 and a turbine.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1:

as shown in fig. 1 to 4, an embodiment of the multiple-connected turbine cutting device of the present invention includes a workpiece positioning and fixing tool and a grinding wheel moving and cutting tool, the workpiece positioning and fixing tool comprises a substrate 1, a left base 2 and a right base 3 which are arranged on the substrate 1, the left base 2 is provided with an index plate 4 facing the right base 3, the index plate 4 is provided with a three-jaw self-centering chuck 5, a telescopic sleeve 6 pointing to the left base 2 is arranged on the right base 3, a rotary thimble 7 is arranged at the front end of the telescopic sleeve 6, the rotating ejector pin 7 is a modified rotating ejector pin, the front end of the modified rotating ejector pin is flattened, three floating support cylinders 8 are mounted at the excircle positions of the front end of the rotating ejector pin 7, and the top of the front end of each floating support cylinder 8 points to the direction of the left base 2; the revolution axis of the dividing plate 4 is coaxial with the rotation axis of the rotating thimble 7; during clamping, the outer circle of the butt end of the middle shaft of the multi-connected turbine 9 is positioned and clamped through the three-jaw self-centering chuck 5, and the blank surface of the ball head end 11 of the middle shaft of the multi-connected turbine 9 is supported and locked in a three-point floating mode through the three floating supporting cylinders 8; the grinding wheel moving and cutting tool comprises a grinding wheel machine 12 movably arranged beside the multi-connected turbine 9.

Preferably, the three floating support cylinders 8 are uniformly arranged in the circumferential direction at the outer circumferential position of the front end of the rotating thimble 7.

As a further improvement of the present invention, three support legs 13 extending toward the left base 2 are further disposed at an outer circle position of the front end of the rotating thimble 7, a pre-positioning ring 14 is commonly connected to the front ends of the three support legs 13, an annular groove is disposed in an inner hole of the pre-positioning ring 14, an annular hollow air ring 15 is installed in the annular groove, and the annular hollow air ring 15 is connected to a compressed air source through a compressed air pipeline and an electromagnetic valve disposed on the compressed air pipeline.

In the invention, the grinding wheel movable cutting tool further comprises a linear guide rail 16 fixedly arranged on the substrate 1 and close to one side of the multi-connected turbine 9, and a grinding machine mounting seat 17 movably arranged on the linear guide rail 16, wherein the grinding machine mounting seat 17 is driven by a screw rod 18 connected with the grinding machine mounting seat 17 and a speed reduction servo motor 19 connected with the screw rod 18 to realize the movement of the grinding machine 12 along the direction of the linear guide rail 16 during cutting.

As a further improvement of the present invention, a pull pressure sensor 20 is connected in series with the output shaft connecting part of the speed reducing servo motor 19 on the screw rod 18, and the speed reducing servo motor 19 and the pull pressure sensor 20 are respectively connected with a control system; during cutting, the control system dynamically adjusts the feeding speed according to the propelling force of the screw rod 18 detected by the tension and pressure sensor 20, so that the propelling force of the screw rod 18 is kept constant or does not exceed a preset value, and cutting force controlled variable-speed cutting is realized.

Preferably, an elastic cushion 21 is connected in series to a connection portion of the screw rod 18 and an output shaft of the reduction servo motor 19.

The elastic cushion pad 21 can play a role of buffering when the grinding wheel of the grinder 12 is just in contact with the workpiece, thereby protecting and prolonging the service life of the grinding wheel and improving the safety of cutting.

Preferably, three semicircular unfilled circular positioning holes 22 are formed in the outer circle of the rotating ejector pin 7, and the floating support cylinder 8 is installed and positioned in the unfilled circular positioning holes 22; the three floating support cylinders 8 are connected to a hydraulic station.

The arrangement of the circle-lacking positioning hole 22 meets the installation requirement of the floating support cylinder 8 on one hand, and facilitates the external connection of an oil path on the floating support cylinder 8 on the other hand.

In the invention, the telescopic sleeve 6 adopts a tailstock sleeve structure of a horizontal lathe; the index plate 4 is a numerical control index plate; a section of arc-shaped bent steel wire 23 which is tightly attached to and protrudes out of the clamping face of the clamping jaw is welded on the clamping face of the clamping jaw of the three-jaw self-centering chuck 5, and the plane where the arc-shaped bent steel wire 23 is located is perpendicular to the rotary central axis of the index plate 4.

Preferably, the lower end of the substrate 1 is supported on a frame 24, the upper end of the substrate 1 is provided with a combined movable transparent shield 25, and the combined movable transparent shield 25 covers the grinder 12 when moving to the periphery of the multi-connected turbine 9; and an organ type guide rail cover is arranged on the linear guide rail 16.

Preferably, the lower end of the base plate 1 is connected with a dust collection cover 26, the base plate 1 is provided with a plurality of dust collection holes 27 communicated with the dust collection cover 26, and the dust collection cover 26 is connected with a dust collector 28 through a dust collection pipeline; the compressed air source is an air pump, and an electric air release valve is arranged on the compressed air pipeline and used for releasing the compressed air in the annular hollow air ring 15 when the workpiece is unloaded.

Example 2:

a cutting method using the multiple connected turbine cutting device of embodiment 1, comprising the steps of:

(1) workpiece installation: opening the combined movable transparent shield 25, and clamping the workpiece; during clamping, firstly positioning the excircle of the ball end 11 of the intermediate shaft of the multi-connected turbine 9, then clamping the excircle of the butt end of the intermediate shaft of the multi-connected turbine 9 through the three-jaw self-centering chuck 5, and finally realizing three-point floating propping and locking on the blank surface of the ball end 11 of the intermediate shaft of the multi-connected turbine 9 through the three floating support cylinders 8; when the excircle of the ball end 11 of the middle shaft of the multi-connected turbine 9 is clamped, the excircle of the ball end 11 of the middle shaft of the multi-connected turbine 9 is inserted into the inner hole of the annular hollow air ring 15, and compressed air is filled into the annular hollow air ring 15 to enable the inner hole of the annular hollow air ring 15 to shrink uniformly so as to realize pre-positioning of the excircle of the ball end 11 of the middle shaft of the multi-connected turbine 9; after clamping is completed, the combined movable transparent shield 25 is closed;

(2) cutting a workpiece: the control system starts the dust collector 28, simultaneously starts the grinder 12 to rotate, starts the speed reduction servo motor 19 connected with the screw rod 18 to drive the grinder 12 to move along the linear guide rail 16, and cuts off a plurality of turbines positioned on the same side of the intermediate shaft 10 by the grinding wheel of the grinder 12 in the moving process;

(3) transposition and cutting: the control system drives the numerical control dividing disc 4 to rotate for an angle, a turbine on the uncut side of the intermediate shaft 10 rotates to a cutting position, and then the turbine is cut by the grinder 12;

(4) taking out the workpiece: and (4) repeating the step (3) to cut until the turbines at all the angular positions on the intermediate shaft 10 are cut, closing the grinder 12, opening the combined movable transparent shield 25, and taking out the turbines 29 and the intermediate shaft 10.

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 technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.