Grinding method for concave non-arc cutting edge contour cutter

Abstract

The invention discloses a grinding method for a concave non-arc cutting edge contour cutter, and relates to the technical field of cutter grinding. A cup-shaped grinding wheel is adopted, and the method comprises the following steps that the cup-shaped grinding wheel is clamped on a main shaft, a workpiece to be machined is clamped on a swing shaft, the main shaft can drive the cup-shaped grinding wheel to rotate along a preset axis and move in the X direction and the Y direction, and the swing shaft can drive the workpiece to be machined to swing and feed the disc face of the cup-shaped grinding wheel by a set feed amount; according to the to-be-machined contour of the to-be-machined workpiece, the cup-shaped grinding wheel is driven to rotate, the to-be-machined workpiece is driven to swing by a set swing angle, the normal direction of the grinding point is parallel to the preset axis, the cup-shaped grinding wheel is driven to move by corresponding displacement in the X direction and the Y direction, and the corresponding to-be-ground point is ground; all points on the to-be-machined contour are machined point by point, machining forming motion of the to-be-machined contour is completed, the concave arc cutting edge contour can be ground, and complex non-arc cutting edge contours such as an ellipse, a parabola and a hyperbolic curve can also be ground.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tool grinding, in particular to a method for grinding an inner concave non-circular arc edge profile tool. BACKGROUND

[0002] The current diamond tool grinding process is usually used for processing convex circular arc profile edge diamond tools, and under certain conditions, the side edge of the disc surface of the disc grinding wheel can be used to grind the inner concave circular arc profile edge. SUMMARY

[0003] The present application provides a method for grinding an inner concave non-circular arc edge profile tool, which can not only grind an inner concave circular arc edge profile, but also grind an elliptical, parabolic, hyperbolic, and other complex non-circular arc edge profile.

[0004] The present application is achieved by the following technical solutions:

[0005] The present application provides a method for grinding an inner concave non-circular arc edge profile tool, which adopts a cup-shaped grinding wheel with a grinding protrusion radially arranged, and includes the following steps:

[0006] The cup-shaped grinding wheel is clamped on the main shaft, and the workpiece to be processed is clamped on the swing shaft, the main shaft can drive the cup-shaped grinding wheel to rotate along the preset axis and move along the X and Y directions, and the swing shaft can drive the workpiece to be processed to swing and feed the cup-shaped grinding wheel with a set amount of feed;

[0007] According to the profile to be processed of the workpiece to be processed, the cup-shaped grinding wheel is driven to rotate and the workpiece to be processed is driven to swing at a set swing angle, so that the normal of the grinding point is parallel to the preset axis, and the cup-shaped grinding wheel is driven to move along the X and Y directions by a corresponding displacement, and the corresponding grinding point is ground;

[0008] The swing angle is continuously adjusted, and the cup-shaped grinding wheel is driven to move along the X and Y directions by a corresponding displacement, and all points on the profile to be processed are processed one by one, and the processing and forming movement of the profile to be processed is completed.

[0009] The method for grinding an inner concave non-circular arc edge profile tool provided by the present application adopts a cup-shaped grinding wheel with a grinding protrusion radially arranged, which can make the grinding protrusion contact with the workpiece to be processed, and at the same time, can avoid the workpiece to be processed from colliding with the grinding wheel during rotation within a certain range, resulting in movement interference between the workpiece to be processed and the grinding wheel, ensuring that the grinding wheel can play a role in grinding the workpiece to be processed.

[0010] Meanwhile, the cup-shaped grinding wheel is clamped on the main shaft, and the workpiece to be processed is clamped on the swing shaft, the main shaft can drive the cup-shaped grinding wheel to rotate along the preset axis, to move along the X direction and the Y direction, the swing shaft can drive the workpiece to be processed to swing and feed the cup-shaped grinding wheel to the disc surface by a set feeding amount, then according to the profile to be processed of the workpiece to be processed, the cup-shaped grinding wheel is driven to rotate and the workpiece to be processed is driven to swing by a set swing angle, so that the normal line of the grinding point is parallel to the preset axis, and the cup-shaped grinding wheel is driven to move along the X direction and the Y direction by a corresponding displacement, so as to grind the corresponding grinding point, then the swing angle is continuously adjusted and the cup-shaped grinding wheel is driven to move along the X direction and the Y direction by a corresponding displacement, so as to process all points on the profile to be processed point by point, and the processing forming movement of the profile to be processed is completed.

[0011] Therefore, the forming movement of the present application includes the rotation movement of the cup-shaped grinding wheel around the center line of the main shaft (i.e. the above-mentioned preset axis), the movement of the cup-shaped grinding wheel in the X direction and the Y direction in the horizontal direction relative to the swing center of the workpiece to be processed, and the linkage movement of the workpiece to be processed with the swing of the swing shaft, so that the normal line of the contact point between the grinding convex (the working part of the grinding wheel) and the inner concave non-circular arc edge profile is always along the direction parallel to the center line of the grinding wheel (i.e. the above-mentioned center line of the main shaft, the preset axis), which can not only grind the inner concave circular arc edge profile, but also grind complex non-circular arc edge profiles such as ellipse, parabola, hyperbola and the like.

[0012] Specifically, the swing shaft is installed on a sliding table, the sliding table is installed on a feeding shaft, and the sliding table can slide relative to the feeding shaft by a set distance to the cup-shaped grinding wheel.

[0013] Specifically, a limiting mechanism is arranged on the feeding shaft, and the limiting mechanism is used to limit the sliding amount of the sliding table.

[0014] Specifically, the profile to be processed is an inner concave ellipse edge profile, an inner concave parabola edge profile, an inner concave hyperbola edge profile, an inner concave non-spherical meridian section edge profile, an inner concave multi-segment circular arc edge profile and the like, which does not intersect with the normal line of any point thereof, and does not intersect with a line passing through the point and forming a certain angle with the normal line, i.e. the profile to be processed can satisfy the movement interference between the workpiece and the grinding wheel disc in the above-mentioned processing method.

[0015] In an optional embodiment of the present application, the profile to be processed is an inner concave ellipse edge profile.

[0016] Specifically, the model of the profile to be processed is:

[0017] ,

[0018] wherein a and b are the semi-axis lengths of the ellipse, respectively, and are the parameter angles corresponding to the end points of the profile curve respectively. and are the parameter angles corresponding to the end points of the profile curve respectively.

[0019] Specifically, the coordinates of the grinding starting point are , and the normal direction vector of the modified point is .

[0020] Correspondingly, the coordinates of the to-be-ground point (point A) are , and the direction vector is .

[0021] Therefore, the included angle between the normal vector of point A and point N, i.e. the swing angle, is calculated as .

[0022] Specifically, when the swing angle is in the positive direction (counterclockwise is the positive direction), the displacement of the cup-shaped grinding wheel relative to the center of rotation of the to-be-processed workpiece is calculated as:

[0023] ,

[0024] wherein:

[0025] is the displacement of the cup-shaped grinding wheel relative to the X direction of the center of rotation of the to-be-processed workpiece;

[0026] is the displacement of the cup-shaped grinding wheel relative to the Y direction of the center of rotation of the to-be-processed workpiece;

[0027] is the point position of the grinding point A in the X direction after the swing angle β;

[0028] is the point position of the grinding point A in the Y direction after the swing angle β.

[0029] In an optional embodiment of the present application, the grinding protrusion is a bevel wedge structure to expand the angle range that can be processed by the cup-shaped grinding wheel.

[0030] In an optional embodiment of the present application, the cup-shaped grinding wheel is a diamond grinding wheel suitable for grinding diamond materials to ensure that the cup-shaped grinding wheel can grind diamond cutters.

[0031] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0032] The grinding method of the concave non-circular-arc edge profile cutter provided by the application comprises the following steps: a cup-shaped grinding wheel is arranged on a grinding machine, and a workpiece to be machined is arranged on a worktable of the grinding machine; the cup-shaped grinding wheel is rotated around a center line, and the workpiece to be machined is swung around a swing axis; and the workpiece to be machined is moved along a horizontal direction X and a horizontal direction Y relative to the rotation center of the cup-shaped grinding wheel. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0034] In the drawings:

[0035] Figure 1 The structure schematic diagram of the cup-shaped grinding wheel used in the embodiments of the present application;

[0036] Figure 2 The flowchart schematic diagram of the grinding method of the concave non-circular-arc edge profile cutter provided by the embodiments of the present application;

[0037] Figure 3 The schematic diagram of the initial position of the concave non-circular-arc edge profile cutter during the grinding process of the embodiments of the present application;

[0038] Figure 4 The schematic diagram of the concave non-circular-arc edge profile cutter during the grinding process of the embodiments of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments.

[0040] Embodiment 1

[0041] The embodiment provides a grinding method of a concave non-circular-arc edge profile cutter, and a cup-shaped grinding wheel is used, and a grinding protrusion is arranged in a radial direction of the cup-shaped grinding wheel.

[0042] Combination Figure 1The cup-shaped grinding wheel is radially provided with the grinding protrusions, so that the grinding protrusions can contact the workpiece to be processed, and the workpiece to be processed can avoid collision with the grinding wheel during rotation within a certain range, so that the workpiece to be processed and the grinding wheel do not interfere with each other, and the grinding wheel can grind the workpiece to be processed.

[0043] Preferably, the grinding protrusions are in the form of inclined wedge structures to expand the angle range of the cup-shaped grinding wheel.

[0044] In the embodiment, the cup-shaped grinding wheel is a diamond grinding wheel suitable for grinding diamond materials, so that the cup-shaped grinding wheel can grind the diamond tool. Of course, for other materials of the workpiece to be processed, a grinding wheel suitable for the corresponding material is used, such as a commonly used grinding metal, glass, etc.

[0045] The embodiment includes the following steps:

[0046] S10, respectively clamping the cup-shaped grinding wheel on the main shaft and clamping the workpiece to be processed on the swing shaft, the main shaft can drive the cup-shaped grinding wheel to rotate along the preset axis and move along the X direction and the Y direction, and the swing shaft can drive the cup-shaped grinding wheel to swing and feed the disc surface of the cup-shaped grinding wheel by a set amount.

[0047] That is, during processing, the cup-shaped grinding wheel installed on the main shaft has a rotational motion around the center line and a motion in the X direction and the Y direction relative to the workpiece. The workpiece is located on the swing shaft and swings with the swing shaft, and has a feeding motion towards the disc surface of the grinding wheel under the action of the grinding pressure.

[0048] That is, in the grinding process of the inner concave non-circular arc edge profile, the forming motion includes the rotational motion of the cup-shaped grinding wheel around the center line, the motion of the cup-shaped grinding wheel in the X direction and the Y direction relative to the workpiece, and the linkage of the workpiece swinging with the swing shaft. The rotation of the main shaft provides the speed condition required for the grinding wheel disc installed thereon to grind the diamond.

[0049] It can be understood that the feeding motion is a straight line motion, which can be realized by a feeding shaft with a straight line motion. In the embodiment, the swing shaft is installed on the sliding table, the sliding table is installed on the feeding shaft, and the sliding table can slide towards the cup-shaped grinding wheel by a set distance, that is, the feeding motion.

[0050] In combination with Figure 3, actual processing when the diamond tool to be polished on the point (A point) position has a margin of polishing processing, the feed axis of the feed slide under the action of force (such as the weight of the pull), so that the fixed on the diamond tool to be polished A point pressure on the working part of the cup-shaped grinding wheel (grinding convex, that is Figure 1 The tip position), with the grinding of the cup-shaped grinding wheel, the excess material at A point is removed. A point material removal at the same time under the action of the above force, the diamond tool to the grinding wheel face, keep the diamond tool to be polished A point pressure on the working part of the grinding wheel.

[0051] Generally, the feed axis is provided with a limiting mechanism, the limiting mechanism is used to limit the sliding amount of the slide, the feed axis also has a feed limiting device, which realizes the limiting function of the feed slide, that is, the slide of the feed axis can be limited and cannot continue to feed under the action of force.

[0052] Specifically, when the A point position of the diamond tool to be polished has no margin of polishing processing, for the grinding of A point, the slide of the feed axis should be limited, so that the force promoting the workpiece feeding motion is borne by the limiting device, so that the A point of the diamond tool to be polished fixed thereon has no grinding pressure with the working part of the grinding wheel, at this time the material of A point is no longer removed, and the processing at A point is completed. This process is applicable to each grinding point on the profile, and when all the points to be polished have no margin of polishing processing, the concave non-circular arc edge profile of the tool is completed.

[0053] S20, according to the profile to be processed of the workpiece to be processed, driving the cup-shaped grinding wheel to rotate and driving the workpiece to be processed to swing a set swing angle, making the normal of the grinding point parallel to the preset axis, and driving the cup-shaped grinding wheel to move in X direction and Y direction corresponding displacement, grinding the corresponding point to be polished.

[0054] Combined with Figure 3 And Figure 4 , specifically, the concave non-circular arc edge profile is designed in advance, and the profile is known. The forming motion method of the concave non-circular arc edge profile is described as follows: the cup-shaped grinding wheel rotates all the time, assuming that the point coordinates of a point on the concave non-circular arc edge profile polished by the cup-shaped grinding wheel at the starting position are N , the normal of N point is parallel to the direction of the center line of the grinding wheel disc, at this time the A point coordinates on the workpiece are , if A point is to be polished next, the grinding wheel disc should move relative to the workpiece center of rotation in the horizontal direction relative to the starting position as follows:

[0055] (1) The swing axis drives the workpiece to swing an angle β, the size of the angle β is the included angle between the normal line of point A and the normal line of point N, to ensure that the normal of the grinding point is always parallel to the direction of the rotational symmetry center line of the grinding wheel disc. After setting the swing angle β of the swing axis, the coordinates of point A become .

[0056] (2) The displacement Δx of the grinding wheel disc relative to the workpiece rotation center in the X direction is .

[0057] (3) The displacement Δy of the grinding wheel disc relative to the workpiece rotation center in the Y direction is .

[0058] S30, continue to adjust the swing angle and drive the cup-shaped grinding wheel to move in the X direction and the Y direction by a corresponding displacement, process all points on the to-be-processed contour one by one, and complete the processing forming motion of the to-be-processed contour.

[0059] That is, according to the above motion mode, all points on the to-be-processed contour are processed one by one, and the processing forming motion of the to-be-processed concave non-circular arc edge contour is completed. The motions in the above (1)-(3) involved in the entire forming motion need to be linked.

[0060] In summary, the cup-shaped grinding wheel is clamped on the main shaft and the to-be-processed workpiece is clamped on the swing axis in the embodiment, the main shaft can drive the cup-shaped grinding wheel to rotate along the preset axis, move in the X direction and the Y direction, the swing axis can drive the to-be-processed workpiece to swing and feed a set amount of feed to the disc surface of the cup-shaped grinding wheel, then according to the to-be-processed contour of the to-be-processed workpiece, the cup-shaped grinding wheel is driven to rotate and the to-be-processed workpiece is driven to swing a set swing angle, the normal of the grinding point is parallel to the preset axis, and the cup-shaped grinding wheel is driven to move in the X direction and the Y direction by a corresponding displacement, to grind the corresponding to-be-ground point, then the swing angle is continuously adjusted and the cup-shaped grinding wheel is driven to move in the X direction and the Y direction by a corresponding displacement, to process all points on the to-be-processed contour one by one, and complete the processing forming motion of the to-be-processed contour.

[0061] Therefore, the forming motion of the embodiment includes not only the rotational motion of the cup-shaped grinding wheel around the center line, but also the motion of the cup-shaped grinding wheel in the X direction and the Y direction relative to the rotation center of the to-be-processed workpiece in the horizontal direction, and the linkage motion of the to-be-processed workpiece with the swing of the swing axis, so that the normal of the contact point between the grinding convex (the working part of the grinding wheel) and the concave non-circular arc edge contour is always in a direction parallel to the center line of the grinding wheel rotation, which not only can grind the concave circular arc edge contour, but also can grind complex non-circular arc edge contours such as ellipse, parabola, hyperbola, etc.

[0062] The workpiece to be machined in the grinding process does not interfere with the grinding wheel, and can be machined according to the above method, so it is not limited to ellipses, parabolas, hyperbolas, non-spherical meridian section lines, multi-segment circular arcs, etc., that is, the to-be-machined profile is an inner concave elliptical edge profile, an inner concave parabolic edge profile, an inner concave hyperbolic edge profile, an inner concave non-spherical meridian section line edge profile, an inner concave multi-segment circular arc edge profile, etc., which does not intersect with the normal line of any point on itself, and does not intersect with the line passing through the point and the normal line at a certain angle, that is, the to-be-machined profile can satisfy the movement interference of the workpiece with the grinding wheel in the above machining method.

[0063] Embodiment 2

[0064] In combination with Figure 3 and Figure 4 , this embodiment provides a method for grinding an inner concave non-circular arc edge profile cutter, based on the description of embodiment 1, in this embodiment, the to-be-machined profile is an inner concave elliptical edge profile. That is, this embodiment takes machining an inner concave elliptical edge profile as an example, specifically:

[0065] Suppose the elliptical edge profile curve on the diamond cutter of the inner concave elliptical edge profile to be ground (the coordinate system origin coincides with the center point of the elliptical profile, and the major and minor axes of the elliptical profile are parallel to the coordinate axes), the semi-axes are a and b respectively, then the model of the to-be-machined profile is:

[0066] , wherein, is the parameter angle of the elliptical equation, and are the parameter angles corresponding to the end points of the profile curve, respectively.

[0067] Suppose the coordinates at the starting position (grinding starting point) are , and the normal direction vector is ;

[0068] The coordinates of the to-be-ground point are , and the normal direction vector is ;

[0069] The swing angle is .

[0070] Specifically, when the swing angle is in the positive direction (counterclockwise is positive), the coordinates of point A on the profile become , according to the coordinate rotation transformation , that is, Therefore, when the swing shaft swings by an angle β (counterclockwise is positive), the displacement calculation model of the cup-shaped grinding wheel relative to the center of rotation of the workpiece to be machined is:

[0071] .

[0072] It should be noted that, for other concave curved surface profile, according to the above method, when grinding a certain point, the swing angle β of the swing shaft and the displacement of the grinding wheel disc are calculated, and after all the points on the profile to be processed are processed point by point, the corresponding concave non-circular blade profile diamond cutter can be ground out.

[0073] It should be particularly pointed out that the embodiment can be used on similar or other products, such as grinding and polishing processing of other materials with similar concave non-circular arc profile surfaces, and can also be used for convex curved surface profile processing.

[0074] The application provides a concave non-circular arc blade profile cutter grinding method, and the above specific embodiments further specifically explain the purposes, technical solutions and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A method for grinding a tool with a concave non-circular arc cutting edge profile, characterized in that, Using a cup-shaped grinding wheel, wherein the cup-shaped grinding wheel has grinding protrusions arranged radially, the process includes the following steps: The cup-shaped grinding wheel is clamped on the main spindle and the workpiece to be processed is clamped on the swing shaft. The main spindle can drive the cup-shaped grinding wheel to rotate along a preset axis and move along the X and Y directions. The swing shaft can drive the workpiece to be processed to swing and feed a set amount of feed to the disc surface of the cup-shaped grinding wheel. According to the contour of the workpiece to be processed, the cup-shaped grinding wheel is driven to rotate and the workpiece to be processed is driven to swing at a set swing angle so that the normal of the grinding point is parallel to the preset axis, and the cup-shaped grinding wheel is driven to move the corresponding displacement along the X and Y directions to grind the corresponding grinding point. Continue to adjust the swing angle and drive the cup-shaped grinding wheel to move the corresponding displacement along the X and Y directions, and process all points on the contour to be processed one by one to complete the processing and forming motion of the contour to be processed.

2. The grinding method for a tool with a concave non-circular arc cutting edge profile according to claim 1, characterized in that, The swing shaft is mounted on a slide table, which is mounted on the feed shaft, and the slide table can slide a set distance relative to the feed shaft towards the cup-shaped grinding wheel.

3. The method for grinding tools with concave non-circular arc cutting edge contours according to claim 2, characterized in that, The feed axis is provided with a limiting mechanism, which is used to limit the sliding amount of the slide.

4. The grinding method for a tool with a concave non-circular arc cutting edge profile according to claim 1, characterized in that, The profile to be processed is a concave elliptical cutting edge profile, a concave parabolic cutting edge profile, a concave hyperbola cutting edge profile, a concave aspherical meridional section cutting edge profile, or a concave multi-segment circular arc cutting edge profile.

5. The method for grinding tools with concave non-circular arc cutting edge contours according to claim 4, characterized in that, The contour to be processed is an inwardly concave ellipse.

6. The method for grinding tools with concave non-circular arc cutting edge contours according to claim 5, characterized in that, The model of the contour to be processed is: ,in, Let be the parameter angle of the ellipse equation. and These are the parameter angles corresponding to the endpoints of the contour curve.

7. The method for grinding tools with concave non-circular arc cutting edge contours according to claim 6, characterized in that, The coordinates of the grinding starting point are Directional quantity is , where b is the length of the minor axis of the ellipse; The coordinates of the point to be ground are: Directional quantity is , where a is the length of the major axis of the ellipse; The swing angle is .

8. The method for grinding tools with concave non-circular arc cutting edge contours according to claim 7, characterized in that, When the swing angle is in the positive direction, the displacement calculation model of the cup-shaped grinding wheel relative to the rotation center of the workpiece to be processed is as follows: ， in: The displacement of the cup-shaped grinding wheel in the X direction relative to the rotation center of the workpiece to be processed; The displacement of the cup-shaped grinding wheel in the Y direction relative to the rotation center of the workpiece to be processed; The point to be ground is located in the X direction; The point to be ground is located in the Y direction.

9. The method for grinding tools with concave non-circular arc cutting edge contours according to any one of claims 1 to 8, characterized in that, The grinding protrusions have a wedge-shaped structure.

10. The method for grinding tools with concave non-circular arc cutting edge contours according to any one of claims 1 to 8, characterized in that, The cup-shaped grinding wheel is a diamond grinding wheel suitable for grinding and processing diamond materials.

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