CN113399750A

CN113399750A - Numerical control gear burnishing machine with high machining precision and precision improving process

Info

Publication number: CN113399750A
Application number: CN202110702902.XA
Authority: CN
Inventors: 杨孝耀
Original assignee: Jiaxing Xinlan Technology Co ltd
Current assignee: Jiaxing Xinlan Technology Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-09-17

Abstract

The invention relates to the technical field of numerical control processing production equipment, and discloses a numerical control gear burnishing machine with high processing precision, which comprises a machine body, wherein a fixed column is fixedly arranged on the machine body, the inner wall of the bottom end of the fixed column is rotationally connected with the inner wall of the top of a gear burnishing assembly, a movable seat is fixedly arranged at the bottom end of the gear burnishing assembly, the numerical control gear burnishing machine with high processing precision and a precision improving process are adopted, an extension block arranged at the bottom end of a gear burnishing cutter is stressed to extrude and move a sliding plate, the sliding plate slides on the inner wall of a rotating plate, a contact head moves downwards to separate two attracted magnetic blocks, the moving magnetic blocks slide a transverse rod through a movable rod, the transverse rod passes through the movable rod to drive the rotating plate to rotate, a rectangular block on the inner wall of a side box slides on the surface of an arc-shaped rod to enable a guide rope to be downwards stretched, the moved guide rope drives a baffle to rotate, then the baffle does not intercept a lifting column, the lifting column moves upwards to enable the gear burnishing cutter to be contacted with a workpiece again, thereby effectively improving the processing precision.

Description

Numerical control gear burnishing machine with high machining precision and precision improving process

Technical Field

The invention relates to the technical field of numerical control machining production equipment, in particular to a numerical control gear burnishing machine with high machining precision and a process for improving the precision.

Technical Field

The numerical control gear-extruding machine is suitable for batch, small batch and single piece production and processing of cylindrical gears and worm gears, 6 teeth with the length less than 300 and short spline shafts with the length more than 6 teeth can also be continuously subjected to indexing hobbing by a spline hob for processing the cylindrical gears with certain parameters, the cylindrical gears can be subjected to reverse milling and forward milling hobbing, the full tooth width is processed by adopting an axial feeding method, and the common worm gears are processed by adopting a radial feeding method in the hobbing of the numerical control gear-extruding machine.

In the production process of a general numerical control gear burnishing machine, the following two defects are often existed:

1. teeth and cylinders of the conventional numerical control gear-extruding machine are generally manufactured by adopting die casting, namely the teeth and the cylinders are a whole, the conditions of uneven casting and irregularity are very likely to occur in the casting process, a certain tiny error exists in the gear-extruding process, and after one tooth is damaged, the whole gear-extruding cutter cannot perform gear-extruding work and needs to be integrally replaced;

2. if the teeth and the cylinder are embedded and separated, the root of the extruding cutter is impacted to generate vibration when the extruding operation is carried out, so that friction is caused, the teeth are shortened and loosened, and the surface of a workpiece of a moxa worker is not smooth;

according to the problems, the slidable tooth is provided, a certain buffer effect can be achieved when the tooth extruding work is started, the damage of a motor caused by the impact generated when the tooth extruding cutter is in contact with a workpiece can be avoided, and the upward moving force can be generated after the tooth extruding cutter is abraded.

Disclosure of Invention

In order to achieve the purpose of improving the precision, the invention provides the following technical scheme: the numerical control gear burnishing machine with high machining precision comprises a machine body, a gear burnishing assembly, a bottom box and a fixing assembly, wherein a fixing column is fixedly arranged on the machine body, the inner wall of the bottom end of the fixing column is rotatably connected with the inner wall of the top of the gear burnishing assembly, and a movable seat is fixedly arranged at the bottom end of the gear burnishing assembly;

the tooth extruding assembly comprises a supporting column, an installation shell is fixedly installed on the surface of the supporting column, a tooth extruding cutter is slidably connected to the inner wall of the installation shell, a rebound rod is fixedly installed on the surface of the top end of the installation shell, a push pad is fixedly installed on the surface of the top end of the rebound rod, a side support is fixedly installed at the top of the inner wall of the installation shell, a support frame is fixedly installed at the bottom of the inner wall of the installation shell, and a bottom box is fixedly installed at the top end of the support frame;

the side box is fixedly arranged on the left side and the right side of the bottom of the inner wall of the bottom box, a rotating plate is connected to one side, close to the vertical center line of the bottom box, of the side box in a sliding mode, a sliding plate is movably connected to the inner wall, close to one side of the vertical center line of the bottom box, of the rotating plate, a touch head is fixedly arranged on one side, close to the vertical center line of the bottom box, of the sliding plate, fixing components are fixedly arranged on the left side and the right side of the surface of the bottom of the inner wall of the bottom box, an extending block is fixedly arranged on the surface of the top end of the sliding plate, a lifting column is fixedly arranged on the inner wall of the side box, an auxiliary rod is movably connected to the surface of the top of the lifting column, a baffle is rotatably connected to the back of the top of the auxiliary rod, and a guide rope is fixedly arranged on the surface of the top end of the baffle;

the fixed subassembly is including the ejector pin, the left side inner wall swing joint of ejector pin has the transverse bar, the right side fixed surface of transverse bar installs the movable rod, the top surface sliding connection of movable rod has the hollow tube, the inner wall fixed mounting of hollow tube has interior pole, the top fixed mounting of movable rod has the magnetic path, the inner wall fixed mounting that hollow tube vertical center line one side was kept away from to the magnetic path has the shrink pole, one side fixed mounting that hollow tube vertical center line was kept away from to the shrink pole has the guide arm.

Preferably, the number of the magnetic blocks is two, the two magnetic blocks are oppositely arranged, holes matched with the diameter of the guide rod are formed in the inner wall of each magnetic block, the arranged magnetic blocks are made of neodymium magnets, and the oppositely arranged magnetic blocks are convenient to attract and fix.

Preferably, the movable rod is connected with the transverse rod and is movably connected with a rotating shaft, the guide rod is far away from the surface fixed on one side of the vertical center line of the hollow tube and is provided with an inclined rod, the ejector rod is fixed with the bottom box through a circular seat, the rotating shaft of the installation can drive the rotating plate to rotate when the movable rod moves, and the transverse rod is guaranteed to be fixed.

Preferably, the touch head is located above the magnetic blocks, the top end of the touch head is fixedly provided with a stretching belt and a wire bunching wheel and is fixedly connected with the tooth extruding cutter through a round inclined column, and the touch head located above the magnetic blocks can rapidly separate the two attracted magnetic blocks after the touch head is moved by the tooth extruding cutter.

Preferably, the sliding plate is fixedly connected with the touch head through a telescopic rod, a rotating ball and a sliding block are installed at the joint of the sliding plate and the rotating plate, an inclined groove is formed in the inner wall of the rotating plate, and the installed telescopic rod can continuously keep the rotating plate and the touch head fixedly connected after the rotating plate is rotated for a long distance.

Preferably, the inner wall of the side box close to one side of the vertical center line of the bottom box is fixedly provided with an arc-shaped rod, the surface of the side box is connected with a rectangular block in a sliding mode and is connected with the rotating plate through a connecting rod, the length of the rectangular block is fixedly connected with a guide rope, and the installed arc-shaped rod plays a role in facilitating connection.

Preferably, the number of the tooth extruding cutters and the connecting structures of the tooth extruding cutters is twelve, the twelve tooth extruding cutters are equal in shape and size and are symmetrically distributed relative to the circle center of the support, and the twelve tooth extruding cutters with the same shape and size can rapidly cut a workpiece.

Preferably, the push pad is made of heat-resistant flexible materials, the rebound rod is fixed with the push pad through the compression air cushion, the top end surface of the bottom box is provided with a hole matched with the tooth extruding cutter, and the push pad made of flexible materials has a rebound effect and is not easy to damage.

The precision improving process of the numerical control gear burnishing machine with high machining precision comprises the following steps:

s1: cleaning the fixed column, the tooth extruding cutter and the movable seat by using an air gun, and moving residual scrap iron and slag into the tray;

s2: after clamping the workpiece on the basis of S1, starting the whole equipment gear-extruding cutter to extrude the gear of the workpiece at 1000-2000 rpm;

s3: when the bottom end of the tooth extruding cutter is worn on the basis of S2, the rotating plate is not blocked by the baffle 378 after being stressed and moved, and then the tooth extruding cutter is enabled to move outwards by acting force;

s4: unloading the machined workpiece on the basis of S3, then checking the damage condition of each tooth extruding cutter, and then replacing the tooth extruding cutter with serious abrasion;

s5: placing the workpiece on a workbench and standing for 3-5min on the basis of S4;

s6: and (5) cleaning the machine tool on the basis of S5, dismounting the whole gear-extruding device, and placing the gear-extruding device to cause damage due to accidental collision.

The invention has the beneficial effects that: a numerical control gear-extruding machine with high processing precision and a process for improving the precision are characterized in that a tooth-extruding cutter is driven to rotate through a support column and an installation shell, a push pad is firstly contacted with a workpiece to push residual scrap iron and residues of the workpiece flat in the rotating process, then the tooth-extruding cutter performs gear hobbing work, an extension block arranged at the bottom end of the tooth-extruding cutter is forced to extrude and move a sliding plate due to friction generated by the stress of the tooth-extruding cutter, the sliding plate slides on the inner wall of a rotating plate, a touch head moves downwards to separate two attracted magnetic blocks, the moved magnetic blocks slide on the surface of an inner rod through a movable rod, so that a transverse rod slides by the movement of the movable rod, the sliding transverse rod drives the rotating plate to rotate through a rotating shaft, the rotating plate after rotating enables a rectangular block on the inner wall of a side box to slide on the surface of an arc-shaped rod through a connecting rod to enable a guide rope to be stretched downwards, the guide rope after moving drives a baffle plate to rotate, and then the baffle plate does not intercept a lifting column any more, the lifting column moves upwards to enable the gear burnishing cutter to be in contact with the workpiece again, machining precision is effectively improved, and the machining surface of the workpiece is enabled to be neater and smoother.

Drawings

FIG. 1 is an overall front view of the present invention;

FIG. 2 is a schematic view of a tooth extrusion assembly of the present invention;

FIG. 3 is an enlarged view of the structure of the teeth-extruding cutter of the present invention;

FIG. 4 is a schematic view of the bottom case structure of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;

FIG. 6 is a partially sectioned diagrammatic view of a fixing assembly according to the invention;

FIG. 7 is an enlarged view of the structure at C of FIG. 6 according to the present invention.

In the figure: 1. a body; 2. fixing a column; 3. a tooth-extruding component; 31. a pillar; 32. mounting a shell; 33. a gear-extruding cutter; 34. a rebound rod; 35. pushing the pad; 36. a side bracket; 37. a bottom box; 371. a side box; 372. rotating the plate; 373. a sliding plate; 374. a touch head; 375. a fixing assembly; 3751. a top rod; 3752. a transverse bar; 3753. a movable rod; 3754. a hollow tube; 3755. an inner rod; 3756. a magnetic block; 3757. a retracting lever; 3758. a guide bar; 376. an extension block; 377. a lifting column; 378. a baffle plate; 379. guiding a rope; 3710. an auxiliary lever; 38. a support frame; 4. a movable seat.

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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the protection scope of the present invention.

Referring to fig. 1, the numerical control gear burnishing machine with high processing precision comprises a machine body 1, a gear burnishing assembly 3, a bottom box 37 and a fixing assembly 375, wherein the machine body 1 is fixedly provided with a fixing column 2, the inner wall of the bottom end of the fixing column 2 is rotatably connected with the inner wall of the top of the gear burnishing assembly 3, and the bottom end of the gear burnishing assembly 3 is fixedly provided with a movable seat 4;

the movable seat 4 arranged according to the figure 1 is fixed and can rotate in cooperation with the gear-extruding component 3;

referring to fig. 2 and 3, the tooth-extruding component 3 includes a pillar 31, a mounting shell 32 is fixedly mounted on the surface of the pillar 31, the mounting shell 32 is hollow and can support and facilitate mounting of a tooth-extruding cutter 33, and the inner wall of the mounting shell 32 is slidably connected with the tooth-extruding cutter 33;

according to the tooth extruding knives 33 and the connecting structure quantity of the tooth extruding knives in fig. 2, twelve tooth extruding knives 33 are equal in shape and size and are symmetrically distributed relative to the circle center of the strut 31, the twelve tooth extruding knives 33 with the shape and size can rapidly cut a workpiece, the top end surface of the mounting shell 32 is fixedly provided with the rebound rod 34, and the top end surface of the rebound rod 34 is fixedly provided with the push pad 35;

according to the drawing 2, the push pad 35 is made of heat-resistant flexible material, the rebound rod 34 is fixed with the push pad 35 through the compression air cushion, the top end surface of the bottom box 37 is provided with a hole matched with the tooth extruding cutter 33, the push pad 35 made of flexible material has the rebound effect and is not easy to damage, and the installed compression air cushion can conveniently drive the push pad 35 to return to the original position when the push pad 35 is not in contact with a workpiece;

a side bracket 36 is fixedly installed at the top of the inner wall of the installation shell 32, a support frame 38 is fixedly installed at the bottom of the inner wall of the installation shell 32, and a bottom box 37 is fixedly installed at the top end of the support frame 38;

referring to fig. 4 and 5, side cases 371 are fixedly mounted on the left and right sides of the bottom of the inner wall of the bottom case 37, arc-shaped rods are fixedly mounted on the inner wall of the side case 371 close to the vertical center line of the bottom case 37, the surface of the side case is connected with a rectangular block in a sliding manner and connected with the rotating plate 372 through a connecting rod, the short ends of the rectangular block are fixedly connected with the guide ropes 379, the installed arc-shaped rods have the function of facilitating connection, the rectangular block can drive the guide ropes 379 to move by sliding on the surface of the arc-shaped rods, so that the baffle 378 rotates, the rotating plate 372 is connected to the side of the side case 371 close to the vertical center line of the bottom case 37 in a sliding manner, and a sliding plate 373 is movably connected to the inner wall of the rotating plate 372 close to the side of the vertical center line of the bottom case 37;

according to the scheme shown in fig. 4, a sliding plate 373 is fixedly connected with a touch head 374 through a telescopic rod, a rotary ball and a sliding block are installed at the joint of the sliding plate 373 and a rotary plate 372, a chute is formed in the inner wall of the rotary plate 372, the installed telescopic rod can continue to keep the rotary plate 372 and the touch head 374 fixedly connected after the rotary plate 372 is lengthened, the installed rotary ball and the installed sliding block are suitable for different positions of the rotary plate 372 in rotation, and the chute is formed to correspond to the installed sliding block, so that the sliding block can move conveniently;

according to fig. 4 and 7, a touch head 374 is fixedly installed on one side of a sliding plate 373 close to the vertical center line of a bottom case 37, the touch head 374 is located above a magnetic block 3756, a stretching belt and a wire bundling wheel are fixedly installed at the top end of the touch head 374 and fixedly connected with a tooth extruding cutter 33 through a round oblique column, the touch head 374 located above the magnetic block 3756 can rapidly separate two attracted magnetic blocks 3756 after the touch head 374 is moved by the tooth extruding cutter 33, the installed stretching belt and the wire bundling wheel play a role in assisting in fixing the touch head 374, the touch head 374 can be effectively prevented from accidentally dropping, the round oblique column can enhance the fixing force, fixing components 375 are fixedly installed on the left side and the right side of the bottom surface of the inner wall of the bottom case 37, an extending block 376 is fixedly installed on the top surface of the sliding plate 373, a lifting column 377 is fixedly installed on the inner wall of a side case 371, and an auxiliary rod 3710 is movably connected to the top surface of the lifting column 377, a baffle 378 is rotatably connected to the back of the top of the auxiliary rod 3710, and a guide rope 379 is fixedly installed on the top surface of the baffle 378;

referring to fig. 6 and 7, the fixing assembly 375 includes a top rod 3751, a lateral rod 3752 is movably connected to the left inner wall of the top rod 3751, and a movable rod 3753 is fixedly installed on the right surface of the lateral rod 3752;

according to the connection between the movable rod 3753 and the transverse rod 3752 in fig. 6, a rotating shaft is movably connected, an inclined rod is fixedly installed on the surface of one side of the guide rod 3758, which is far away from the vertical center line of the hollow tube 3754, the top rod 3751 is fixed with the bottom box 37 through a circular seat, the installed rotating shaft can drive the rotating plate 372 to rotate when the movable rod 3753 moves, and the transverse rod 3752 is ensured to be fixed, the installed inclined rod plays a role in auxiliary support, the contact area of the installed circular seat is larger than that of the top rod 3751, and the circular seat can be better attached to the bottom box 37;

the top surface of the movable rod 3753 is slidably connected with a hollow tube 3754, the inner wall of the hollow tube 3754 is fixedly provided with an inner rod 3755, and the top end of the movable rod 3753 is fixedly provided with a magnet 3756;

according to the figure 7, the number of the two magnets 3756 is two, the two magnets 3756 are oppositely installed, holes matched with the diameter of the guide rod 3758 are formed in the inner walls of the two magnets 3756, the installed magnets 3756 are made of neodymium magnets, the oppositely installed magnets 3756 are convenient to attract and fix, the matched holes can move to the surface of the guide rod 3758 after the magnets 3756 are stressed, and the effect that the magnets 3756 are convenient to move is achieved;

the inner wall of the magnet 3756 far away from the vertical center line of the hollow tube 3754 is fixedly provided with a contraction rod 3757, and the side of the contraction rod 3757 far away from the vertical center line of the hollow tube 3754 is fixedly provided with a guide rod 3758.

The first embodiment is as follows:

s1: cleaning the fixed column 2, the tooth extruding cutter 33 and the movable seat 4 by using an air gun, and moving residual scrap iron and slag into the tray;

s2: after clamping the workpiece on the basis of S1, starting the whole gear-extruding cutter 33 to extrude the workpiece at 1000 revolutions per minute;

s3: when the bottom end of the teeth-extruding cutter 33 is worn on the basis of S2, the rotating plate 372 is forced to move and then the lifting column 377 is not blocked by the matching baffle 378, so that the teeth-extruding cutter 33 is forced to move outwards;

s4: the machined workpiece is unloaded on the basis of S3, the damage condition of each tooth extruding cutter 33 is checked, and then the tooth extruding cutter 33 with serious abrasion is replaced;

s5: placing the workpiece on a workbench and standing for 3min on the basis of S4;

Example two:

s2: after clamping the workpiece on the basis of S1, starting the whole gear-extruding cutter 33 to extrude the workpiece at 1500 revolutions per minute;

s5: placing the workpiece on a workbench and standing for 4min on the basis of S4;

Example three:

s2: after clamping the workpiece on the basis of S1, starting the whole gear-extruding cutter 33 to extrude the workpiece at 2000 revolutions per minute;

s5: placing the workpiece on a workbench and standing for 5min on the basis of S4;

In conclusion, the numerical control gear-extruding machine with high processing precision and the process for improving the machining precision drive the gear-extruding cutter 33 to rotate through the support column 31 and the mounting shell 32, the push pad 35 contacts with the workpiece to push the residual iron chips and residues of the workpiece to be flat in the rotating process, then the gear-extruding cutter 33 performs gear hobbing work, the friction generated by the force applied to the gear-extruding cutter 33 enables the extension block 376 mounted at the bottom end of the gear-extruding cutter 33 to be pressed and moved to the sliding plate 373, the sliding plate 373 slides on the inner wall of the rotating plate 372, the contact head 374 moves downwards to separate the two attracted magnetic blocks 3756, the moved magnetic blocks 3756 slide on the surface of the inner rod 3755 through the movable rod 3753, so that the transverse rod 3752 is moved and slides by the movable rod 3753, the sliding transverse rod 3752 drives the rotating plate 372 to rotate through the rotating shaft, the rotating plate 372 enables the rectangular blocks on the inner wall of the side box to slide on the surface of the arc rod 371 through the connecting rod to enable the guide rope 379 to be stretched downwards, the guide rope 379 after moving drives the baffle 378 to rotate, then the baffle 378 no longer intercepts the lifting column 377, the lifting column 377 moves upwards to contact the tooth extruding cutter 33 with the workpiece again, and therefore machining precision is effectively improved, and the machining surface of the workpiece is enabled to be neat and smooth.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims

1. Numerical control gear burnishing machine that machining precision is high, including fuselage (1), gear burnishing subassembly (3), under casing (37) and fixed subassembly (375), its characterized in that: a fixed column (2) is fixedly installed on the machine body (1), the inner wall of the bottom end of the fixed column (2) is rotatably connected with the inner wall of the top of the tooth extruding assembly (3), and a movable seat (4) is fixedly installed at the bottom end of the tooth extruding assembly (3);

the tooth extruding assembly (3) comprises a support column (31), a mounting shell (32) is fixedly mounted on the surface of the support column (31), a tooth extruding cutter (33) is slidably connected to the inner wall of the mounting shell (32), a rebound rod (34) is fixedly mounted on the surface of the top end of the mounting shell (32), a push pad (35) is fixedly mounted on the surface of the top end of the rebound rod (34), a side support (36) is fixedly mounted at the top of the inner wall of the mounting shell (32), a support frame (38) is fixedly mounted at the bottom of the inner wall of the mounting shell (32), and a bottom box (37) is fixedly mounted at the top end of the support frame (38);

the left side and the right side of the bottom of the inner wall of the bottom box (37) are fixedly provided with side boxes (371), one side of each side box (371), which is close to the vertical center line of the bottom box (37), is slidably connected with a rotating plate (372), the inner wall of each rotating plate (372), which is close to one side of the vertical center line of the bottom box (37), is movably connected with a sliding plate (373), one side of each sliding plate (373), which is close to the vertical center line of the bottom box (37), is fixedly provided with a contact head (374), the left side and the right side of the bottom surface of the inner wall of the bottom box (37) are fixedly provided with fixed components (375), the top end surface of each sliding plate (373) is fixedly provided with an extending block (376), the inner wall of each side box (371) is fixedly provided with a lifting column (377), the top surface of each lifting column (377) is movably connected with an auxiliary rod (, a guide rope (379) is fixedly arranged on the top end surface of the baffle (378);

fixed subassembly (375) is including ejector pin (3751), the left side inner wall swing joint of ejector pin (3751) has transverse bar (3752), the right side fixed surface of transverse bar (3752) installs movable rod (3753), the top surface sliding connection of movable rod (3753) has hollow tube (3754), the inner wall fixed mounting of hollow tube (3755) has interior pole (3755), the top fixed mounting of movable rod (3753) has magnetic path (3756), the inner wall fixed mounting that hollow tube (3754) vertical center line one side was kept away from in magnetic path (3756) has shrink pole (3757), one side fixed mounting that hollow tube (3754) vertical center line was kept away from in shrink pole (3757) has guide arm (3758).

2. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the number of the magnetic blocks (3756) is two, the two magnetic blocks (3756) are oppositely arranged, and holes matched with the diameters of the guide rods (3758) are formed in the inner walls of the two magnetic blocks.

3. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the movable rod (3753) is movably connected with the transverse rod (3752) through a rotating shaft, an inclined rod is fixedly mounted on the surface of one side, away from the vertical center line of the hollow tube (3754), of the guide rod (3758), and the ejector rod (3751) is fixed with the bottom box (37) through a circular seat.

4. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the touch head (374) is located above the magnetic block (3756), and the top end of the touch head (374) is fixedly provided with a stretching belt and a wire bunching wheel and is fixedly connected with the tooth extruding cutter (33) through a round oblique column.

5. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the sliding plate (373) is fixedly connected with the contact head (374) through a telescopic rod, a rotating ball and a sliding block are installed at the joint of the sliding plate (373) and the rotating plate (372), and a chute is formed in the inner wall of the rotating plate (372).

6. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the inner wall fixed mounting that limit case (371) are close to bottom case (37) vertical center line one side has the arc pole, and surperficial sliding connection has the rectangular block to be connected with commentaries on classics board (372) through the connecting rod, the very weak point and the rope (379) fixed connection of leading of rectangular block.

7. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the number of the tooth extruding cutters (33) and the number of the connecting structures of the tooth extruding cutters are twelve, and the twelve tooth extruding cutters (33) are equal in shape and size and are symmetrically distributed relative to the circle center of the strut (31).

8. The numerical control gear burnishing machine with high machining precision according to claim 1, characterized in that: the push pad (35) is made of heat-resistant flexible materials, the rebound rod (34) is fixed with the push pad (35) through a compression air cushion, and holes matched with the tooth extruding cutter (33) are formed in the top end surface of the bottom box (37).

9. The precision improving process of the high-precision numerical control gear burnishing machine according to claim 1, which is characterized by comprising the following steps of:

s1: cleaning the fixed column (2), the tooth extruding cutter (33) and the movable seat (4) by using an air gun, and moving residual scrap iron and slag into a tray;

s2: after clamping the workpiece on the basis of S1, starting the whole gear-extruding cutter (33) to extrude the workpiece at 1000-2000 rpm;

s3: when the bottom end of the teeth-extruding cutter 33 is worn on the basis of S2, the rotating plate 372 is forced to move and then the baffle (378) is matched with not to block the lifting column (377), so that the teeth-extruding cutter (33) is forced to move outwards;

s4: unloading the machined workpiece on the basis of S3, then checking the damage condition of each tooth extruding cutter (33), and then replacing the tooth extruding cutter (33) which is seriously worn;