CN110712075A - Negative chamfering machining clamp for cutter and using method of negative chamfering machining clamp - Google Patents

Abstract

The invention provides a tool negative chamfering processing fixture and a using method thereof, belonging to the field of mechanical processing. The device includes three parts: a position adjusting mechanism, a rotating shaft mechanism and an angle adjusting mechanism. At present, the processing of negative chamfering mainly relies on the special indexable tool CNC precision grinder imported from abroad and the ordinary grinder assisted by the special negative chamfering fixture. With the help of foreign special indexable tool CNC precision grinder, the precision of negative chamfering is high quality and stable, but the equipment investment is large; while the ordinary grinder grinding using special negative chamfering fixture in China has less equipment investment, but the negative chamfering of grinding. The edge precision is low, the quality is unstable, and the operation is inconvenient. The invention expands the processing range of the common grinding machine, so that the common grinding machine can process the negative chamfer with high precision and stable quality; meanwhile, the structure is simple, the operation is convenient, the tool processing production efficiency is improved, and the production cost is reduced.

Description

A tool for negative chamfering machining fixture and using method thereof

technical field

The invention belongs to the field of mechanical processing, and particularly relates to a tool negative chamfering processing fixture and a method for using the same.

Background technique

The negative chamfering of the tool is a negative rake angle plane with a width of about 0.1-0.2mm that is ground at the cutting edge of the tool, so as to increase the wedge angle of the tool to improve the strength of the tool, and at the same time change the heat dissipation conditions, which can strengthen the cutting edge. On the basis of not increasing the cutting force, the durability of the tool is improved. On many carbide tools, ceramic tools, PCBN tools and various machine-clamped blades, the method of grinding negative chamfers is used to increase the strength of the cutting edge.

At present, the processing of negative chamfering mainly relies on the special indexable tool CNC precision grinder imported from abroad and the ordinary grinder assisted by the special negative chamfering fixture. Due to the existence of technological fortresses in advanced precision grinding technology abroad, it is difficult for us to get a glimpse of some foreign precision CNC grinding machines; while the negative chamfering fixtures independently designed by domestic tool processing factories are relatively poor in quality and poor in operation. It is inconvenient to get up, so in order to effectively and conveniently process the negative chamfers of various tools without resorting to foreign expensive tool precision grinders, we aim to design a tool negative chamfer grinding fixture to expand the processing range of ordinary grinders , so that we can grind high-quality negative chamfering tools on ordinary grinding machines.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems, and to provide a new tool negative chamfering jig.

The technical scheme adopted in the present invention is as follows:

A tool negative chamfering processing fixture comprises a position adjusting mechanism, a rotating shaft mechanism and an angle adjusting mechanism.

The position adjustment mechanism includes a tool rest 1 , an upper slider 2 , a first lead screw bolt 3 , an intermediate slider 4 , a rotating shaft 5 , a tool clamping block 6 , a tool 7 and a second lead screw bolt 8 .

The front side of the tool holder 1 is provided with a figure-eight positioning baffle plate for tool positioning and a cylindrical countersunk hole for the installation of the tool holder fixing bolts; the bottom of the tool holder 1 is provided with a T-shaped for installing the tool holder block 6 . The front end of the T-shaped groove communicates with the front side of the tool holder, the T-shaped groove is opposite to the opening direction of the figure-eight positioning baffle, and the top of the T-shaped groove is provided with a bolt hole for fixing the tool holder 6; the rear side of the tool holder 1 is provided with There is a positioning block for the positioning of the tool holder. The tool holder 1 needs to be replaced with different tool holders according to different tool types to be processed, so as to meet the needs of negative chamfer grinding of different tools.

The upper slider 2 is an irregular structure, and its front side is provided with a positioning groove for positioning the tool holder 1 and a bolt hole for fixing the tool holder 1; , the nut structure and the second screw bolt 8 can cooperate to move the upper slider 2 to drive the tool holder 1 to move in the Y direction;

The first lead screw bolt 3 is a hexagon socket bolt, and an annular semicircular groove is set near the bolt head for installing the first lead screw bolt 3 on the T-shaped slider at the front end of the rotating shaft 5 through the pin.

The middle slider 4 is an irregular structure, and its front end is provided with a rectangular slider. The rectangular slider can slide along the rectangular groove on the rear side of the upper slider 2. The rectangular slider is provided with a groove for installing the upper slider. The nut structure of 2, the front side of the rectangular slider is provided with a pin hole, and the second lead screw bolt 8 is fixedly installed through the pin column. There is a rectangular slot in the middle of the rear end of the middle slider 4, the rectangular slider at the front end is perpendicular to the rectangular slot at the rear end, and a nut structure is also arranged in the middle of the rectangular slot, and the nut structure and the first screw bolt 3 can cooperate with each other. The middle slider 4 drives the upper slider 2 and the tool holder 1 to move in the X direction; the side of the rectangular groove is provided with a bolt hole for installing a clamping bolt to fix the position of the T-shaped slider at the front end of the rotating shaft 5 in the rectangular groove.

The tool clamping block 6 is a T-shaped block. The tool clamping block 6 can slide along the T-shaped groove on the side of the tool holder 1. The front end of the T-shaped block is provided with a groove, which can realize the clamping of a quadrilateral tool; The edges are provided with corresponding chamfers to facilitate tool clamping.

The tool 7 is positioned by the figure-eight positioning baffle on the front end surface of the tool holder 1, and is fixed on the tool holder 1 by a tool holder 6 and an inner hexagon bolt.

The second lead screw bolt 8 is a hexagon socket head bolt, and an annular semicircular groove is set near the bolt head for mounting the second lead screw bolt 8 on the rectangular slide on the front end surface of the intermediate slider 4 through the pin. on the block.

The rotating shaft mechanism includes a rotating shaft 5 , a rotating shaft base 9 and a crank handle 10 .

The front end of the rotating shaft 5 is provided with a T-shaped sliding block, and the T-shaped sliding block can slide along the rectangular groove at the rear end of the intermediate sliding block 4; , The front side of the T-shaped slider is provided with a pin hole for installing the first screw bolt 3 . The middle part of the rotating shaft 5 is placed in the stepped through hole in the horizontal direction at the upper part of the rotating shaft base 9 , and after being placed, the rotating shaft 5 is pushed tightly by the nut in the horizontal direction. The rear end of the rotating shaft 5 is provided with a threaded through hole for installing the crank handle 10 .

The rotating shaft base 9 is a stepped rectangular block structure, the upper part of which is perpendicular to the direction of the front side face is provided with a stepped through hole. Smooth operation. The top of the rotating shaft base 9 is provided with a threaded hole, and a hexagon socket head bolt is installed to fix the rotating shaft 5 to prevent it from rotating when adjusting the position adjusting mechanism. There are through holes on the left and right sides of the stepped platform at the bottom of the rotating shaft base 9 for installing the clamping shaft 13 to fix the position of the rotating shaft base 9 .

The crank handle 10 is a conical cylindrical body with a stepped platform, and a thread is provided at the position where the diameter of the end portion is small, which is used for connecting with the rotating shaft 5 to drive the rotating shaft 5 to rotate. The crank handle 10 is used to increase the rotation radius of the rotating shaft 5 to facilitate the operator to rotate the rotating shaft 5 .

The middle part of the rotating shaft 5 penetrates the stepped through hole of the rotating shaft base 9, and the rear end surface of the T-shaped slider at the front end of the rotating shaft 5 is in contact with the deep groove ball bearing matched with the front side of the stepped hole of the rotating shaft base 9 through a flat washer. The outer diameter of the flat washer is slightly larger. It is smaller than the inner diameter of the outer ring of the deep groove ball bearing to ensure that the flat washer fits the inner ring of the deep groove ball bearing, so that the shaft 5 can rotate with the rotation of the inner ring of the deep groove ball bearing. The deep groove ball bearing matched with the rear side of the stepped hole of the rotating shaft base 9 is fitted with a thrust ball bearing, and the fastening bolts threaded with the middle of the rotating shaft 5 jointly ensure the fixing of the rotating shaft 5 .

The angle adjustment mechanism includes a clamping pin 11 , a nylon sleeve 12 , a clamping shaft 13 , an angle pointer 14 and a base 15 .

The clamping shaft 13 is a cylindrical shaft with two stepped platforms. The part with the smallest diameter at one end is provided with a thread, which passes through the step platform at the bottom of the rotating shaft base 9 to fix the clamping shaft 13 on the base 15; the part with the largest diameter at the other end is provided with a pin hole for installing the clamping pin 11 It is convenient for the operator to rotate the clamping shaft 13 ; the middle optical shaft part is used to cooperate with the rotating shaft base 9 to fix the position of the rotating shaft base 9 .

One end of the clamping pin 11 is a hemispherical head, the diameter of the hemispherical head is larger than the inner diameter of the pin hole of the clamping shaft 13 , the other end is an elliptical cylinder, and the middle part is a cylindrical structure. The middle of the clamping pin 11 passes through the pin hole of the clamping shaft 13 , and the hemispherical head and the tail of the elliptical column enable it to move up and down without breaking away from the clamping shaft 13 . The clamping pin 11 can make it convenient for the operator to rotate the clamping shaft 13 under the condition of its own small size.

The nylon sleeve 12 is a nylon material ring, which is installed between the clamping shaft 13 and the rotating shaft base 9 to ensure that the surfaces of the two parts are not damaged during clamping.

The angle pointer 14 is an L-shaped angle iron. One side is triangular, and the angle determined by the rotation of the shaft base 9 is ensured by the coincidence of the triangular apex angle with the different angle scale lines on the left side of the base 15; the other side is provided with two threaded holes for the angle pointer. Installed on the shaft base 9 .

The left side of the base 15 is provided with a countersunk bolt hole for installing the clamping shaft 13 and fixing the position of the rotating shaft base 9; the left side is also provided with an angle scale, which is used to coincide with the triangular top of the angle pointer 14 Determine the rotation angle of the shaft base 9; the right side is provided with a wedge-shaped groove, and the rear side is provided with a pin hole, which is used to install a pin to clamp the ordinary grinder tool holder into the wedge-shaped groove, and fix the base 15 to the ordinary grinder. on the knife holder.

The position adjustment mechanism needs to be adjusted by means of a stereo microscope before processing a batch of tools of the same specification to ensure that the arc of the tool tip coincides with the axis of the rotating shaft 5 .

A method for using a tool negative chamfering fixture, the steps are as follows:

The first step, first, after the tool negative chamfering processing fixture is assembled, after fixing the base 15 on the stereo microscope worktable, hold the clamping pin 11 to rotate the clamping shaft 13, so that the rotating shaft base 9 can be rotated around. The clamping shaft 13 is rotated. Next, rotate the rotating shaft base 9 to make the rotating shaft 5 vertical, and then hold the clamping pin 11 again to rotate the clamping shaft 13 to fix the position of the rotating shaft base 9 . Finally, loosen the clamping bolts behind the tool clamping block 6, place the tool 7 on the figure-eight positioning baffle of the tool holder 1, and then rotate the tool clamping bolts to drive the tool clamping block 6 to clamp the tool.

The second step is to loosen the slider clamping bolt on the side of the middle slider 4, and adjust the position of the tool 7X relative to the rotating shaft by adjusting the first screw bolt 3; loosen the slider clamping bolt on the side of the upper slider 2 The position of the tool 7Y relative to the rotation axis can be adjusted by adjusting the second screw bolt 8. By adjusting the displacement of the tool 7 in the X and Y directions, it is ensured that the center of the arc of the tool nose of the tool 7 coincides with the axis of the rotating shaft 5 .

In the third step, after the center of the tool nose arc of tool 7 is adjusted to coincide with the axis of rotating shaft 5, rotate the slider clamping bolt on the side of the middle slider 4 to fix the position of tool 7 relative to the rotating shaft in the X direction; rotate the upper slider 2. The slider on the side clamps the bolt to fix the position of the tool 7 relative to the rotation axis in the Y direction; loosen the fixation of the base 15 on the stereo microscope worktable, and move the tool negative chamfering fixture to the ordinary grinder worktable. The fixed base 15 is fixed on the tool holder of a common grinder.

The fourth step is to hold the clamping pin 11 to rotate the clamping shaft 13, loosen the fixing of the rotating shaft base 9, and manually rotate the rotating shaft base 9 so that the rotating shaft 5 driven by it is at a certain angle with the vertical plane, and the size of the angle is The angle of the negative chamfering required to be ground is ensured by ensuring that the triangular top of the angle pointer 14 coincides with the angle scale on the base 15 to ensure the accuracy of the angle. The negative chamfering width to be ground is adjusted by the micro-feed mechanism of the ordinary grinding machine.

The fifth step is to carry out grinding. When grinding, rotate the crank handle 10 to ensure that the main and auxiliary cutting edges of the tool and the negative chamfering of the tool tip arc are ground. After grinding a tool, release the tool holder 6. After the clamping bolt is removed from the tool, the negative chamfering of the next tool is performed. Because the same batch of tools have the same specifications, there is no need to re-calibrate the tool. It is only necessary to install a new tool and then repeat the grinding.

Beneficial effects of the invention: a negative chamfering grinding fixture is designed and invented, which can realize uniform grinding of the main and auxiliary cutting edges of the tool and the negative chamfering with a certain angle and width at the arc of the tool tip. On the one hand, it is convenient to use, and tools of the same specification can be processed in batches after one position adjustment; The invention has the advantages of simple structure, convenient manufacture and use, and high negative chamfering quality of the grinding tool.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure in an embodiment of the present invention.

Fig. 2 is the axonometric schematic diagram of the lower side of the structure of the position adjustment mechanism in the embodiment of the present invention;

FIG. 3 is a schematic axonometric view of the upper side of the structure of the position adjustment mechanism in the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a rotating shaft in an embodiment of the present invention.

5 is a schematic diagram of an angle adjustment mechanism in an embodiment of the present invention;

6 is a schematic diagram of the right side of the angle adjustment mechanism in the embodiment of the present invention;

FIG. 7 is a schematic structural diagram of the upper slider 2 in the embodiment of the present invention;

FIG. 8 is a schematic structural diagram of the middle slider 4 in the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of the second lead screw bolt 8 in the embodiment of the present invention;

10 is a schematic structural diagram of the rotating shaft 5 in the embodiment of the present invention;

In the figure: tool holder 1, upper slider 2, first screw bolt 3, middle slider 4, rotating shaft 5, tool holder 6, tool 7, second screw bolt 8, rotating shaft base 9, crank handle 10 , Clamping pin 11, nylon sleeve 12, clamping shaft 13, angle pointer 14, base 15.

Detailed ways

The technical solutions of the present invention will be further described below with reference to specific embodiments and accompanying drawings.

A tool negative chamfering processing fixture comprises a position adjusting mechanism, a rotating shaft mechanism and an angle adjusting mechanism.

The position adjustment mechanism includes a tool rest 1 , an upper slider 2 , a first lead screw bolt 3 , an intermediate slider 4 , a rotating shaft 5 , a tool clamping block 6 , a tool 7 and a second lead screw bolt 8 .

The front side of the tool holder 1 is provided with a figure-eight positioning baffle plate for tool positioning and a cylindrical countersunk hole for the installation of the tool holder fixing bolts; the bottom of the tool holder 1 is provided with a T-shaped for installing the tool holder block 6 . The front end of the T-shaped groove communicates with the front side of the tool holder, the T-shaped groove is opposite to the opening direction of the figure-eight positioning baffle, and the top of the T-shaped groove is provided with a bolt hole for fixing the tool holder 6; the rear side of the tool holder 1 is provided with There is a positioning block for the positioning of the tool holder. The tool holder 1 needs to be replaced with different tool holders according to different tool types to be processed, so as to meet the needs of negative chamfer grinding of different tools.

The upper slider 2 is an irregular structure, and its front side is provided with a positioning groove for positioning the tool holder 1 and a bolt hole for fixing the tool holder 1; , the nut structure and the second screw bolt 8 can cooperate to move the upper slider 2 to drive the tool holder 1 to move in the Y direction;

The first lead screw bolt 3 is a hexagon socket bolt, and an annular semicircular groove is set near the bolt head for installing the first lead screw bolt 3 on the T-shaped slider at the front end of the rotating shaft 5 through the pin.

The middle slider 4 is an irregular structure, and its front end is provided with a rectangular slider. The rectangular slider can slide along the rectangular groove on the rear side of the upper slider 2. The rectangular slider is provided with a groove for installing the upper slider. The nut structure of 2, the front side of the rectangular slider is provided with a pin hole, and the second lead screw bolt 8 is fixedly installed through the pin column. There is a rectangular slot in the middle of the rear end of the middle slider 4, the rectangular slider at the front end is perpendicular to the rectangular slot at the rear end, and a nut structure is also arranged in the middle of the rectangular slot, and the nut structure and the first screw bolt 3 can cooperate with each other. The middle slider 4 drives the upper slider 2 and the tool holder 1 to move in the X direction; the side of the rectangular groove is provided with a bolt hole for installing a clamping bolt to fix the position of the T-shaped slider at the front end of the rotating shaft 5 in the rectangular groove.

The tool clamping block 6 is a T-shaped block. The tool clamping block 6 can slide along the T-shaped groove on the side of the tool holder 1. The front end of the T-shaped block is provided with a groove, which can realize the clamping of a quadrilateral tool; The edges are provided with corresponding chamfers to facilitate tool clamping.

The tool 7 is positioned by the figure-eight positioning baffle on the front end surface of the tool holder 1, and is fixed on the tool holder 1 by a tool holder 6 and an inner hexagon bolt.

The second lead screw bolt 8 is a hexagon socket head bolt, and an annular semicircular groove is set near the bolt head for mounting the second lead screw bolt 8 on the rectangular slide on the front end surface of the intermediate slider 4 through the pin. on the block.

The rotating shaft mechanism includes a rotating shaft 5 , a rotating shaft base 9 and a crank handle 10 .

The front end of the rotating shaft 5 is provided with a T-shaped sliding block, and the T-shaped sliding block can slide along the rectangular groove at the rear end of the intermediate sliding block 4; , The front side of the T-shaped slider is provided with a pin hole for installing the first screw bolt 3 . The middle part of the rotating shaft 5 is placed in the stepped through hole in the horizontal direction at the upper part of the rotating shaft base 9 , and after being placed, the rotating shaft 5 is pushed tightly by the nut in the horizontal direction. The rear end of the rotating shaft 5 is provided with a threaded through hole for installing the crank handle 10 .

The rotating shaft base 9 is a stepped rectangular block structure, the upper part of which is perpendicular to the direction of the front side face is provided with a stepped through hole. Smooth operation. The top of the rotating shaft base 9 is provided with a threaded hole, and a hexagon socket head bolt is installed to fix the rotating shaft 5 to prevent it from rotating when adjusting the position adjusting mechanism. There are through holes on the left and right sides of the stepped platform at the bottom of the rotating shaft base 9 for installing the clamping shaft 13 to fix the position of the rotating shaft base 9 .

The crank handle 10 is a conical cylindrical body with a stepped platform, and a thread is provided at the position where the diameter of the end portion is small, which is used for connecting with the rotating shaft 5 to drive the rotating shaft 5 to rotate. The crank handle 10 is used to increase the rotation radius of the rotating shaft 5 to facilitate the operator to rotate the rotating shaft 5 .

The stepped shaft at the rear of the rotating shaft 5 penetrates the stepped through hole of the rotating shaft base 9, and the rear end surface of the T-shaped slider at the front end of the rotating shaft 5 contacts the deep groove ball bearing matched with the front side of the stepped hole of the rotating shaft base 9 through a flat washer. The outer diameter is slightly smaller than the inner diameter of the outer ring of the deep groove ball bearing to ensure that the flat washer fits the inner ring of the deep groove ball bearing, so that the shaft 5 can rotate with the rotation of the inner ring of the deep groove ball bearing. The deep groove ball bearing matched with the rear side of the stepped hole of the rotating shaft base 9 is fitted with a thrust ball bearing, and the fastening bolts threaded with the middle of the rotating shaft 5 jointly ensure the fixing of the rotating shaft 5 .

The angle adjustment mechanism includes a clamping pin 11 , a nylon sleeve 12 , a clamping shaft 13 , an angle pointer 14 and a base 15 .

The clamping shaft 13 is a cylindrical shaft with two stepped platforms. The part with the smallest diameter at one end is provided with a thread, which passes through the step platform at the bottom of the rotating shaft base 9 to fix the clamping shaft 13 on the base 15; the part with the largest diameter at the other end is provided with a pin hole for installing the clamping pin 11 It is convenient for the operator to rotate the clamping shaft 13 ; the middle optical shaft part is used to cooperate with the rotating shaft base 9 to fix the position of the rotating shaft base 9 .

One end of the clamping pin 11 is a hemispherical head, the diameter of the hemispherical head is larger than the inner diameter of the pin hole of the clamping shaft 13 , the other end is an elliptical cylinder, and the middle part is a cylindrical structure. The middle of the clamping pin 11 passes through the pin hole of the clamping shaft 13 , and the hemispherical head and the tail of the elliptical column enable it to move up and down without breaking away from the clamping shaft 13 . The clamping pin 11 can make it convenient for the operator to rotate the clamping shaft 13 under the condition of its own small size.

The nylon sleeve 12 is a nylon material ring, which is installed between the clamping shaft 13 and the rotating shaft base block 9 to ensure that the surfaces of the two parts are not damaged during clamping.

The angle pointer 14 is an L-shaped angle iron. One side is triangular, and the angle determined by the rotation of the shaft base 9 is ensured by the coincidence of the triangular apex angle with the different angle scale lines on the left side of the base 15; the other side is provided with two threaded holes for the angle pointer. Installed on the shaft base 9 .

The left side of the base 15 is provided with a countersunk bolt hole for installing the clamping shaft 13 and fixing the position of the rotating shaft base 9; the left side is also provided with an angle scale, which is used to coincide with the triangular top of the angle pointer 14 Determine the rotation angle of the shaft base 9; the right side is provided with a wedge-shaped groove, and the rear side is provided with a pin hole, which is used to install a pin to clamp the ordinary grinder tool holder into the wedge-shaped groove, and fix the base 15 to the ordinary grinder. on the knife holder.

The position adjustment mechanism needs to be adjusted by means of a stereo microscope before processing a batch of tools of the same specification to ensure that the arc of the tool tip coincides with the axis of the rotating shaft 5 .

A method of using a tool negative chamfering fixture, the steps are as follows:

The first step, first, after the tool negative chamfering processing fixture is assembled, after fixing the base 15 on the stereo microscope worktable, hold the clamping pin 11 to rotate the clamping shaft 13, so that the rotating shaft base 9 can be rotated around. The clamping shaft 13 is rotated. Next, rotate the rotating shaft base 9 to make the rotating shaft 5 vertical, and then hold the clamping pin 11 again to rotate the clamping shaft 13 to fix the position of the rotating shaft base 9 . Finally, loosen the clamping bolts behind the tool clamping block 6, place the tool 7 on the figure-eight positioning baffle of the tool holder 1, and then rotate the tool clamping bolts to drive the tool clamping block 6 to clamp the tool.

The second step is to loosen the slider clamping bolt on the side of the middle slider 4, and adjust the position of the tool 7X relative to the rotating shaft by adjusting the first screw bolt 3; loosen the slider clamping bolt on the side of the upper slider 2 The position of the tool 7Y relative to the rotation axis can be adjusted by adjusting the second screw bolt 8. By adjusting the displacement of the tool 7 in the X and Y directions, it is ensured that the center of the arc of the tool nose of the tool 7 coincides with the axis of the rotating shaft 5 .

In the third step, after the center of the tool nose arc of tool 7 is adjusted to coincide with the axis of rotating shaft 5, rotate the slider clamping bolt on the side of the middle slider 4 to fix the position of tool 7 relative to the rotating shaft in the X direction; rotate the upper slider 2. The slider on the side clamps the bolt to fix the position of the tool 7 relative to the rotation axis in the Y direction; loosen the fixation of the base 15 on the stereo microscope worktable, and move the tool negative chamfering fixture to the ordinary grinder worktable. The fixed base 15 is fixed on the tool holder of a common grinder.

The fourth step is to hold the clamping pin 11 to rotate the clamping shaft 13, loosen the fixing of the rotating shaft base 9, and manually rotate the rotating shaft base 9 so that the rotating shaft 5 driven by it is at a certain angle with the vertical plane, and the size of the angle is The angle of the negative chamfering required to be ground is ensured by ensuring that the triangular top of the angle pointer 14 coincides with the angle scale on the base 15 to ensure the accuracy of the angle. The negative chamfering width to be ground is adjusted by the micro-feed mechanism of the ordinary grinding machine.

The fifth step is to carry out grinding. When grinding, rotate the crank handle 10 to ensure that the main and auxiliary cutting edges of the tool and the negative chamfering of the tool tip arc are ground. After grinding a tool, release the tool holder 6. After the clamping bolt is removed from the tool, the negative chamfering of the next tool is performed. Because the same batch of tools have the same specifications, there is no need to re-calibrate the tool. It is only necessary to install a new tool and then repeat the grinding.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (6)

1. The fixture for machining the negative chamfer of the cutter is characterized by comprising a position adjusting mechanism, a rotating shaft mechanism and an angle adjusting mechanism;

the position adjusting mechanism comprises a tool rest (1), an upper sliding block (2), a first lead screw bolt (3), a middle sliding block (4), a rotating shaft (5), a tool clamping block (6), a tool (7) and a second lead screw bolt (8); the position adjusting mechanism needs to be adjusted through a stereoscopic microscope before a batch of cutters with the same specification are processed, and the coincidence of the circular arc of the cutter point of the cutter and the axis of the rotating shaft (5) is ensured;

the front side surface of the tool rest (1) is provided with a splayed positioning baffle for positioning a tool (7) and a cylindrical counter bore for mounting a tool rest fixing bolt, and the tool (7) is fixed on the tool rest (1) through a tool clamping block (6) and an inner hexagon bolt after being positioned; the bottom of the tool rest (1) is provided with a T-shaped groove for installing the tool clamping block (6), the tool clamping block (6) can slide along the T-shaped groove on the side surface of the tool rest (1), the front end of the T-shaped groove is communicated with the front side surface of the tool rest, the T-shaped groove is opposite to the opening direction of the splayed positioning baffle plate, and the top of the T-shaped groove is provided with a bolt hole for fixing the tool clamping block (6); a positioning block for installing and positioning the tool rest is arranged on the rear side surface of the tool rest (1);

the front side surface of the upper sliding block (2) is provided with a positioning groove for positioning the tool rest (1) and a bolt hole for fixing the tool rest (1); the rear part of the rectangular groove is provided with a rectangular groove, the middle of the rectangular groove is provided with a nut structure, and the nut structure and a second screw bolt (8) are matched to move so that the upper sliding block (2) drives the tool rest (1) to move along the Y direction; the upper sliding block (2) is fixed through a clamping bolt arranged on the side surface of the rectangular groove;

an annular semicircular groove is formed in the position, close to the bolt head, of the first lead screw bolt (3) and used for installing the first lead screw bolt (3) on a T-shaped sliding block at the front end of the rotating shaft (5); an annular semicircular groove is formed in the position, close to the bolt head, of the second lead screw bolt (8) and used for installing the second lead screw bolt (8) on the rectangular sliding block on the front end face of the middle sliding block (4);

the front end of the middle sliding block (4) is provided with a rectangular sliding block which can slide along a rectangular groove on the rear side surface of the upper sliding block (2), a groove is formed in the rectangular sliding block and used for installing a nut structure of the upper sliding block (2), and the front side surface of the rectangular sliding block is provided with a pin hole for fixedly installing a second lead screw bolt (8); a rectangular groove is formed in the middle of the rear end of the middle sliding block (4), the rectangular sliding block at the front end is perpendicular to the rectangular groove at the rear end in spatial position, a nut structure is arranged in the middle of the rectangular groove, and the nut structure and the first lead screw bolt (3) are matched to move so that the middle sliding block (4) drives the upper sliding block (2) and the tool rest (1) to move along the X direction; the position of a T-shaped sliding block at the front end of the rotating shaft (5) in the rectangular groove is fixed through a clamping bolt arranged on the side surface of the rectangular groove;

the rotating shaft mechanism comprises a rotating shaft (5), a rotating shaft base (9) and a crank (10);

the front end of the rotating shaft (5) is provided with a T-shaped sliding block, and the T-shaped sliding block can slide along a rectangular groove at the rear end of the middle sliding block (4); a groove matched with the nut structure of the middle sliding block (4) is formed in the middle of the T-shaped sliding block, and a pin hole is formed in the front side face of the T-shaped sliding block and used for mounting a first lead screw bolt (3); a crank (10) is arranged at the rear end of the rotating shaft (5);

the rotating shaft base (9) is of a stepped rectangular block structure and comprises an upper stepped platform and a bottom stepped platform; a step through hole is formed in the upper step platform in the horizontal direction, and the middle of the rotating shaft (5) penetrates through the step through hole; the top of the rotating shaft base 9 is provided with a threaded hole, and an inner hexagon bolt is arranged for fixing the rotating shaft 5 to prevent the rotating shaft from rotating when the position adjusting mechanism is adjusted; deep groove ball bearings are arranged on the front side and the rear side of the stepped through hole to ensure the stable operation of the rotating shaft (5) under the working condition, the rear end face of a T-shaped sliding block at the front end of the rotating shaft (5) is contacted with the deep groove ball bearing matched with the front side of the stepped hole of the rotating shaft base (9) through a flat gasket, and the rotating shaft (5) rotates along with the rotation of an inner ring of the deep groove ball bearing; a deep groove ball bearing matched with the rear side of the stepped through hole of the rotating shaft base (9) is attached to a thrust ball bearing, and the fixing of the rotating shaft (5) is ensured together with a nut in the middle of the rotating shaft (5); the bottom step platform is provided with a through hole for installing a clamping shaft (13) and fixing the position of the rotating shaft base (9), and the rear side surface of the bottom step platform is provided with two threaded holes for installing angle pointers (14);

the angle adjusting mechanism comprises a clamping pin (11), a nylon sleeve (12), a clamping shaft (13), an angle pointer (14) and a base (15);

the clamping shaft (13) is of a cylindrical shaft structure provided with two steps; the end with the smallest diameter is provided with a thread and penetrates through the step table at the bottom of the rotating shaft base (9) to fix the clamping shaft (13) on the base (15); the end with the largest diameter is used for installing a clamping pin (11) of a rotary clamping shaft (13); the middle optical axis part is used for matching with the rotating shaft base (9) to fix the rotating shaft base (9);

the nylon sleeve (12) is a nylon material circular ring and is arranged between the clamping shaft (13) and the rotating shaft base (9) to ensure that the surfaces of the two parts are not damaged during clamping;

the angle pointer (14) is an L-shaped angle iron; one side of the rotating shaft base is triangular, and the determined angle of rotation of the rotating shaft base (9) is ensured by the coincidence of the vertex angle of the triangle and the scale marks of different angles on the left side surface of the base (15); the other side is arranged on a rotating shaft base (9);

a clamping shaft (13) is arranged on the left side surface of the base (15) to fix the position of the rotating shaft base (9); the left side surface is also provided with angle scales which are used for determining the rotating angle of the rotating shaft base (9) by being coincided with the triangular tip of the angle pointer (14); the base (15) is fixed on a common grinder rest.

2. The negative chamfering tool fixture according to claim 1, wherein the first lead screw bolt (3) and the second lead screw bolt (8) are both hexagon socket head cap screws.

3. The negative chamfering machining clamp of the cutter as claimed in claim 1, wherein the cutter clamping block (6) is of a T-shaped block structure, and the front end of the T-shaped block is provided with a groove for clamping a quadrilateral cutter; the edges at the two sides of the groove are provided with corresponding chamfers to facilitate the clamping of a cutter.

4. The negative chamfering fixture of the cutter as claimed in claim 1, wherein the rear end face of the T-shaped slider at the front end of the rotating shaft (5) is contacted with the deep groove ball bearing matched with the front side of the stepped hole of the rotating shaft base (9) through a flat washer, the outer diameter of the flat washer is smaller than the inner diameter of the outer ring of the deep groove ball bearing, the flat washer is ensured to be attached to the inner ring of the deep groove ball bearing, and the rotating shaft (5) can rotate along with the rotation of the inner ring of the deep groove ball bearing.

5. The negative chamfering tool fixture as claimed in claim 1, wherein one end of the clamping pin (11) is a hemispherical head, the diameter of the hemispherical head is larger than the inner diameter of the pin cylinder hole of the clamping shaft (13), the other end of the clamping pin is an elliptic cylinder, and the middle part of the clamping pin is of a cylindrical structure; the middle part of the clamping pin (11) passes through a pin hole of the clamping shaft (13), and the semi-spherical head and the elliptic cylinder tail part enable the clamping pin to move up and down without separating from the clamping shaft (13).

6. The use method of the tool negative chamfer machining fixture according to any one of claims 1 to 5, characterized by comprising the following steps:

firstly, after the tool negative chamfering machining clamp is assembled, fixing a base (15) on a stereoscopic microscope workbench, holding a clamping pin (11) by hand to rotate a clamping shaft (13), and enabling a rotating shaft base (9) to rotate around the clamping shaft (13); secondly, rotating the rotating shaft base (9) to enable the rotating shaft (5) to be vertical, then holding the clamping pin (11) again to rotate the clamping shaft (13), and fixing the position of the rotating shaft base (9); finally, loosening the clamping bolt behind the cutter clamping block (6), placing the cutter (7) on the splayed positioning baffle of the tool rest (1), and rotating the cutter clamping bolt to drive the cutter clamping block (6) to clamp the cutter;

secondly, loosening a slide block clamping bolt on the side surface of the middle slide block (4), and adjusting the position of the cutter (7) in the X direction relative to the rotating shaft by adjusting the first screw bolt (3); loosening a slide block clamping bolt on the side surface of the upper slide block (2), and adjusting the position of the cutter (7) in the Y direction relative to the rotating shaft by adjusting a second lead screw bolt (8); the center of the arc of the tool point of the tool (7) is ensured to coincide with the axle center of the rotating shaft (5) by adjusting the displacement of the tool (7) X, Y;

thirdly, after the center of the arc of the tool point of the tool (7) is adjusted to coincide with the axis of the rotating shaft (5), rotating a sliding block clamping bolt on the side surface of the middle sliding block (4) and fixing the position of the tool (7) relative to the rotating shaft in the X direction; rotating a slide block clamping bolt on the side surface of the upper slide block (2) and fixing the position of the cutter (7) relative to the rotating shaft in the Y direction; loosening the fixing of the base (15) on the stereoscopic microscope workbench, moving the negative chamfering fixture of the cutter to the workbench of a common grinding machine, and fixing the base (15) on a tool rest of the common grinding machine;

fourthly, holding the clamping pin (11) by hand to rotate the clamping shaft (13), loosening the fixation of the rotating shaft base (9), manually rotating the rotating shaft base (9), further enabling the rotating shaft (5) driven by the rotating shaft base to form a certain angle with the vertical surface, wherein the angle is the angle of the negative chamfer to be ground, and ensuring the accuracy of the angle by ensuring the superposition of the triangular tip of the angle pointer (14) and the angle scale on the base (15); the width of the ground negative chamfer is adjusted by a micro-feeding mechanism of a common grinding machine;

fifthly, grinding is carried out, the crank (10) is rotated during grinding to ensure that the main and auxiliary cutting edges of the cutter and the negative chamfer grinding at the arc position of the cutter point, and after one cutter is ground, a clamping bolt after a cutter clamping block (6) is loosened is dismounted from the cutter, and then the negative chamfer grinding of the next cutter is carried out; the same specification of the same batch of cutters does not need to be adjusted again, and only a new cutter needs to be installed and then grinding is repeated.

Images