CN118024015B - Method for determining center track of tool nose circle of tool and method for processing revolving body - Google Patents

Abstract

The invention discloses a method for determining the center track of a tool nose circle of a tool and a method for processing a revolving body, which comprises the following steps: controlling the end face of the cutter point to be vertical to the Y axis; determining a difference delta Y between the tool tip end face and the central axis of the machine tool main shaft in the Y direction, and judging whether the tool tip end face is coplanar with the central axis of the machine tool main shaft or not based on the difference delta Y; when the difference value delta Y is not zero, determining the value of the required bias of the established machining coordinate system in the Y direction based on the difference value delta Y; determining the position delta X of the center of the tool nose circle to the center of the sphere of the workpiece to be processed in the X direction; determining the position delta Z from the center of the tool nose circle to the center of the workpiece to be processed; and (3) taking the spherical center of the workpiece to be processed as an origin, establishing a processing coordinate system, and taking the compiled contour as a contour track program of the center of the tool nose circle based on delta Y, delta X and delta Z. The invention determines a new processing coordinate system based on delta Y, delta X and delta Z, and can very accurately control the cutter to cut along the surface of the workpiece to be processed after a processing program is run.

Description

Method for determining center track of tool nose circle of tool and method for processing revolving body

Technical Field

The invention relates to the technical field of bearing processing methods, in particular to a method for determining a tool nose circle center track of a tool and a method for processing a revolving body.

Background

This section provides merely background information related to the present disclosure and does not necessarily constitute prior art.

The joint bearing is a spherical sliding bearing, the sliding contact surface of which is an inner spherical surface and an outer spherical surface, and can rotate and swing at any angle during movement, and the joint bearing is manufactured by adopting a plurality of special process treatment methods such as surface phosphating, hole explosion, gasket inlay, spraying and the like. The knuckle bearing has the characteristics of high load capacity, impact resistance, corrosion resistance, abrasion resistance, self-aligning property, good lubrication and the like.

The common processing equipment for the spherical surfaces of the inner ring and the outer ring of the knuckle bearing is a horizontal lathe, and the inner spherical surface and the outer spherical surface are turned. Because the feed mechanism of the horizontal lathe adopts screw-nut transmission, the processing precision grade of the knuckle bearing in some special application scenes is very high, the positioning precision is not high, and the processing equipment cannot meet the precision requirements of the inner spherical surface and the outer spherical surface of the knuckle bearing. When the high-precision linear motor is adopted to drive the vertical machining center to machine the machining center of the rotary table, after the cutter is mounted on the main shaft of the machine tool, the cutter is required to be fixed through a specific cutter handle, but the end face of the cutter cannot be guaranteed to be coplanar with the axis of the main shaft of the machine tool, and the workpiece machining method is required to determine the positions of the center of a cutter point circle of the cutter and the center of a sphere to be machined, so that a machining coordinate system is established.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the existing processing method cannot meet the requirements of the spherical profile accuracy of the inner and outer surfaces of the knuckle bearing, so as to provide a method for determining the circular center track of the tool nose of the tool and a method for processing a revolving body.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

A method for determining the center track of a tool nose circle of a tool comprises the following steps:

controlling the end face of the cutter point to be vertical to the Y axis; determining a difference delta Y between the end face of the tool nose and the central axis of the machine tool main shaft in the Y direction, and judging whether the end face of the tool nose and the central axis of the machine tool main shaft are coplanar or not based on the difference delta Y;

when the difference delta Y is zero, determining that the end face of the tool nose is coplanar with the central axis of the main shaft of the machine tool, and directly programming a tool nose circle center track program;

when the difference value delta Y is not zero, the end face of the tool nose is not coplanar with the central axis of the main shaft of the machine tool, and the value of the required offset of the established machining coordinate system in the Y direction is determined based on the difference value delta Y; determining the position delta X of the center of the tool nose circle to the center of the workpiece to be processed in the X direction, determining the position delta Z of the center of the tool nose circle to the center of the workpiece to be processed in the Z direction, taking the center of the workpiece to be processed as an origin, establishing a processing coordinate system of the center of the tool nose circle at the coordinate position of the center of the workpiece to be processed, and compiling a contour track program of the center of the tool nose circle at the center of the workpiece to be processed.

Further optimizing the technical scheme, the step of determining the difference delta Y between the end face of the tool nose and the central axis of the machine tool spindle in the Y direction comprises the following steps:

determining the highest point of a cutter handle, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the relative coordinate on a mechanical panel as Y0;

determining a point of the end face position of a tool nose, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the coordinate of the point on the mechanical panel relative to the highest point of the tool handle as Y1;

And determining a difference delta Y= (-Y1-r) of the tool tip end surface and the central axis of the machine tool spindle in the Y direction, wherein Y1 is a negative value, and r is the radius of the tool handle.

According to the further optimized technical scheme, the highest point of the cutter handle and the point for determining the position of the end face of the cutter tip are determined by adopting mu table points.

Further optimizing the technical scheme, determining the position delta X=x1/2-R of the center of the tool nose circle to the center of the workpiece to be processed in the X direction, wherein X1 is the distance between the center of the workpiece to be processed and the tool nose in the X direction, and R is the radius of the tool nose circle.

Further optimizing the technical scheme, determining the position delta Z=Z1-R of the center of the tool nose circle to the center of the workpiece to be processed in the Z direction, wherein Z1 is the distance between the center of the tool nose circle and the center of the workpiece to be processed in the Z direction, and R is the radius of the tool nose circle.

A processing method of a revolving body comprises the following steps:

positioning the rotor onto a rotating device;

establishing a machining coordinate system of the center of the tool nose circle at the coordinate position of the sphere center of the revolving body based on the tool nose circle center track determining method;

And (3) offsetting the allowance, programming a machining program based on a machining coordinate system of the center of the cutter point circle at the coordinate position of the center of the revolving body, and carrying out rough machining and/or finish machining on the revolving body through a cutter.

According to the technical scheme, the revolving body is a joint bearing inner ring or a joint bearing outer ring.

Further optimizing the technical scheme, the joint bearing inner ring is positioned through a first tool, and the specific positioning process is as follows:

and expanding the central hole of the inner ring of the knuckle bearing by using the conical round table, and locking and positioning the conical round table and the inner ring of the knuckle bearing to the first tool.

Further optimizing the technical scheme, the knuckle bearing outer lane is fixed a position through the second frock, and specific location process is:

the outer ring of the knuckle bearing is pressed onto the bottom plate by utilizing an end cover with an opening at the top end, and the end cover and the bottom plate are locked and positioned;

Or a plurality of locating pieces are arranged along the grooves of the outer ring of the knuckle bearing, and the outer ring of the knuckle bearing is located on the bottom plate by the locating pieces.

Further optimizing the technical scheme, before the rough machining and/or the finish machining are carried out on the revolving body, the method further comprises the step of confirming a machining route of an inner ring or an outer ring of the knuckle bearing:

Determining a processing route of an inner ring of the knuckle bearing: roughly turning the outer circle of the inner ring of the knuckle bearing, ensuring the external dimension and determining the reference position; a blade is finely turned, and semi-finish machining is carried out on the outer circle of the inner ring of the knuckle bearing; reducing the offset allowance, and carrying out finish machining on the outer circle of the inner ring of the knuckle bearing;

Determining a machining route of the outer ring of the knuckle bearing: finely boring a reference hole of an outer ring of the knuckle bearing; roughly turning the inner circle of the outer ring of the knuckle bearing; straightening the pin hole and roughly milling an open slot; finish milling and back-off; reducing the offset allowance and finely turning the inner circle of the outer ring of the knuckle bearing.

Further optimizing the technical scheme, wherein the cutter is a CBN lathe tool;

And/or the cutter is a vertical cutter;

and/or the tool nose circle at the end part of the tool is contacted with the revolving body and processes the revolving body.

According to the technical scheme, the cutter is positioned on the cutter handle, the cutter handle is a special-shaped cutter handle, and a cutter positioning groove for positioning the cutter is formed in the cutter handle;

The tool handle is fixed on the tool handle positioning seat, and the tool handle positioning seat is fixedly connected with the machine tool spindle shell so that the tool and the tool handle do not rotate along with the machine tool spindle.

According to the further optimized technical scheme, the revolving body is driven through the direct-drive motor, the output shaft end of the direct-drive motor is connected with the rotating shaft, and the rotating shaft is connected with the tool for positioning the revolving body.

The technical scheme of the invention has the following advantages:

1. The method for determining the center track of the tool nose circle of the tool adopts a mode of judging the difference delta Y between the end face of the tool nose and the central axis of the main shaft of the machine tool in the Y direction to judge whether the end face of the tool nose and the central axis of the main shaft of the machine tool are coplanar. When the end face of the tool nose is not coplanar with the central axis of the main shaft of the machine tool, respectively calculating the value of the offset required by the center of the tool nose circle in the Y, X, Z direction, manually inputting preset coordinate values delta X, delta Y and delta Z of the position of the tool in a workpiece coordinate system after trial cutting into a corresponding tool compensation unit of the numerical control lathe through a machine tool operation panel, and determining the position of the origin of the workpiece coordinate system through coordinate conversion calculation according to the coordinate values preset at the position, so that the origin of the machine tool coordinate system is offset to the required origin of the workpiece coordinate system, thus establishing a workpiece coordinate system, writing a machining program through the coordinate system, and very accurately controlling the tool to carry out cutting machining along the surface of the workpiece to be machined after the machining program is operated, thereby ensuring the machining precision grade requirement of the knuckle bearing in some special application scenes.

2. According to the method for determining the center track of the tool nose circle of the tool, provided by the invention, the highest point of the tool shank and the point for determining the position of the end face of the tool nose are determined by adopting the mu meter, the mu meter can be very accurately positioned to the highest point of the tool shank and the position of the end face of the tool nose, the point at the mu meter is accurately detected based on the grating ruler, and the difference delta Y between the end face of the tool nose and the central axis of the main shaft of the machine tool in the Y direction is very accurately determined.

3. The method for determining the center track of the tool nose circle of the tool, provided by the invention, correctly determines the positioning scheme and the clamping scheme, performs error analysis and calculation, and ensures the machining precision of a workpiece; the structure is simpler, and the manufacturing cost is low; the installation datum surface of the tool body is large in area and high in surface quality, so that the assembly precision is high; the designed tool is convenient to operate and safe to work, and reduces the labor intensity of workers.

4. The processing method of the revolving body provided by the invention has the advantages that the revolving body is driven by the direct-drive motor, the defects that lead screw transmission cannot be overcome are eliminated, the precision is high, the speed is high, the surface quality is good, the processing method of the revolving body also has better flexible processing performance, the processing method of the revolving body is suitable for processing parts with higher precision, the batch production can be realized, and even the automatic processing of flexible wires can be realized.

5. According to the processing method of the revolving body, the center hole of the inner ring of the knuckle bearing is expanded by the conical round table, so that the inner ring of the knuckle bearing is locked and fixed.

6. According to the processing method of the revolving body, when the joint bearing outer ring is positioned on the revolving device, the joint bearing outer ring is pressed on the bottom plate by the end cover with the top end opening, and the end cover and the bottom plate are locked and positioned. The clamp adopts one-side two-pin positioning, has high positioning precision, the clamping surface is arranged on the whole end surface, the stress surface is larger, and the clamp is stable and is not easy to deform.

7. According to the processing method of the revolving body, the cutter is a CBN turning tool, the CBN cutter is high in self hardness and excellent in wear resistance, high-speed cutting is realized, the service life of the cutter is longer, and the processing method is suitable for processing high-hardness workpieces with the hardness higher than HRC 45; the impact toughness and fracture resistance are strong, the metal cutting rate is high, and the workpiece with the intermittent machining rate of more than HRC60 does not break; the cutting performance is more stable, the double cutting edges are more economical, and the process of replacing grinding with turning and the like can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of a method for determining the center locus of a tool nose circle of a tool;

FIG. 2 is a schematic view of the structure of the inner ring of the knuckle bearing provided by the invention;

FIG. 3 is a schematic view of the structure of the outer race of the knuckle bearing provided by the invention;

FIG. 4 is a schematic structural view of the first tooling provided by the invention when positioning the inner ring of the knuckle bearing;

FIG. 5 is a schematic structural diagram of the second tooling provided by the invention when positioning the outer ring of the knuckle bearing;

FIG. 6 is a schematic view of a second tooling for positioning an outer race of a spherical plain bearing according to another embodiment of the present invention;

Fig. 7 is a schematic view of a structure of a knuckle bearing inner ring processed by the processing method of a revolving body according to the present invention;

Fig. 8 is a schematic structural view of the method for processing the knuckle bearing outer ring according to the present invention;

FIG. 9 is a schematic view of the structure of the tool shank provided by the invention;

FIG. 10 is a schematic diagram of the connection structure among the machine tool spindle, the tool shank positioning seat and the tool shank provided by the invention;

FIG. 11 is a cross-sectional view of a machine tool spindle, a tool shank positioning seat, and a tool shank provided by the invention.

Reference numerals:

1. The tool comprises a joint bearing inner ring, 2, a joint bearing outer ring, 3, a first tool, 4, a second tool, 41, an end cover, 42, a bottom plate, 43, a locating piece, 5, a conical round table, 6, a locking screw, 7, a tool, 8, a tool handle, 81, a tool locating groove, 82, a tool handle shaft, 83, a locating block, 9, a tool handle locating seat, 91, a boss, 10, a machine tool main shaft, 11, a machine tool main shaft housing, 12 and a locking piece.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, the method for processing the revolving body according to the present invention is only a preferred embodiment and is not limited to the protection scope of the method for processing the revolving body.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are inclusive and therefore specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.

Although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. In addition, in the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

For ease of description, spatially relative terms, such as "front," "back," "middle," "inner," "longitudinal," "lateral," "side," "vertical," "outer," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the mechanism in use or operation in addition to the orientation depicted in the figures. For example, if the mechanism in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Accordingly, the example term "below … …" may include both upper and lower orientations. The mechanism may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

The joint bearing is a spherical sliding bearing, the sliding contact surface of which is an inner spherical surface and an outer spherical surface, and can rotate and swing at any angle during movement, and the joint bearing is manufactured by adopting a plurality of special process treatment methods such as surface phosphating, hole explosion, gasket inlay, spraying and the like. The knuckle bearing has the characteristics of high load capacity, impact resistance, corrosion resistance, abrasion resistance, self-aligning property, good lubrication and the like.

The common processing equipment for the spherical surfaces of the inner ring and the outer ring of the knuckle bearing is a horizontal lathe, and the inner spherical surface and the outer spherical surface are turned. As shown in fig. 9, the tool 7 is positioned on a shank, and the shank 8 is a shaped shank. The shank 8 includes a shank body and a shank shaft 82. The cutter handle 8 is provided with a cutter positioning groove 81 for positioning the cutter 7. Because the diameter of the shank is small, the shank needs to bear cutting force after the cutter is mounted to the cutter positioning groove 81, so the shank at the cutter positioning groove often has a certain thickness, and when the cutter is positioned to the cutter positioning groove 81, a distance exists between the cutter tip end surface and the machine tool spindle in the Y direction. On the other hand, the tool is not required to be positioned in the tool positioning groove 81, and the end face of the tool tip of the tool is positioned at the center of the spindle of the machine tool, and the position of the tool can be calibrated only after the tool is positioned. Therefore, when the tool is positioned in the tool positioning groove 81, there is a distance in the Y direction between the edge face and the spindle of the machine tool. Therefore, after the tool is mounted on the machine tool spindle, the end face of the tool cannot be guaranteed to be coplanar with the axis of the machine tool spindle.

The existing workpiece processing method is to establish a processing coordinate system by taking the coplanarity of the end face of the cutter and the axis of the main shaft of the machine tool as a reference. The machining precision grade of the knuckle bearing in some special application scenes is high, and the existing horizontal lathe equipment and machining method cannot meet the precision requirements of the inner spherical surface and the outer spherical surface of the knuckle bearing.

Based on the method, the invention provides a method for determining the center track of the tool nose circle of the tool, which calculates the value of the offset required by the center of the tool nose circle in the Y, X, Z direction, and adds delta Y, delta X and delta Z on a machine tool coordinate system respectively, so as to determine a new processing coordinate system, realize the programming of the center track of the tool nose circle of the tool, and realize the precise processing of the inner spherical surface profile and the outer spherical surface profile of the knuckle bearing.

Because the processing precision grade of the knuckle bearing is high in some special application scenes (such as the knuckle bearing of an aircraft landing gear), the precision of interpolation circular arcs is not high in a servo motor and screw rod driving mode adopted by the horizontal lathe feed, and the precision requirements of the inner spherical surface and the outer spherical surface contours of the knuckle bearing are not met.

Based on the method, the direct-drive motor drive and the full-closed loop control of the grating ruler are utilized, high-precision interpolation precision is guaranteed, and special tool handles and tools are designed to meet the requirements of internal and external spherical surface profile precision.

Specific embodiments of the present invention will be described in detail below in connection with a method for determining a center locus of a tool nose circle according to a first aspect of the present invention and a method for processing a rotator according to a second aspect of the present invention.

Example 1

It should be noted that, the method for determining the center track of the tool nose circle according to the first aspect of the present invention is only a preferred embodiment of the present invention, and the center track of the tool nose circle according to the present invention may be determined by the method according to the first aspect of the present invention, or may be determined by other methods.

As shown in fig. 1 and 7, the present embodiment discloses a method for determining a center track of a tool nose circle, which includes the following steps:

S1, controlling the end face of the cutter point to be perpendicular to the Y axis. And determining a difference delta Y between the tool tip end face and the central axis of the machine tool main shaft in the Y direction, and judging whether the tool tip end face and the central axis of the machine tool main shaft are coplanar or not based on the difference delta Y. Wherein the end face of the tool nose corresponds to the front tool face of the turning tool.

S2, when the difference delta Y is zero, the end face of the cutter point is determined to be coplanar with the central axis of the main shaft of the machine tool, and then a cutter point circle center track program of the cutter can be directly compiled.

S3, when the difference value delta Y is not zero, the end face of the tool nose is not coplanar with the central axis of the machine tool spindle, and the value of the required offset of the established machining coordinate system in the Y direction is determined based on the difference value delta Y. The value of the required offset in the Y direction of the established machining coordinate system is the difference deltay. That is, in this step, the positional relationship between the center axis of the machine tool spindle and the end face of the tool is determined, and the position of the tool in the workpiece coordinate system is determined.

And determining the position delta X from the center of the tool nose circle to the center of the sphere of the workpiece to be processed in the X direction.

And determining the position delta Z from the center of the tool nose circle to the center of the sphere of the workpiece to be processed in the Z direction.

And taking the center of the workpiece to be processed as an origin, establishing a processing coordinate system of the center of the tool nose circle at the coordinate position of the center of the workpiece to be processed based on the difference value delta Y, the position delta X and the position delta Z, and compiling an arc interpolation program to obtain a contour track program of the center of the tool nose circle at the position of the center of the workpiece to be processed.

In this embodiment, the difference Δy between the edge end surface and the central axis of the machine tool spindle is determined to determine whether the edge end surface and the central axis of the machine tool spindle are coplanar. When the end face of the tool nose is not coplanar with the central axis of the machine tool spindle, calculating the value of the bias required by the center of the tool nose circle in the Y, X, Z direction, adding delta Y, delta X and delta Z on the machine tool coordinate system, and further determining a new machining coordinate system (namely the machining coordinate system of the center of the tool nose circle at the spherical center coordinate position of the workpiece to be machined), writing a machining program through the coordinate system, and after the machining program is run, cutting machining of the tool along the surface of the workpiece to be machined can be controlled very accurately, so that the machining precision grade requirement of the spherical bearing under some special application scenes is ensured.

Before step S1, the edge end surface of the tool needs to be leveled, and this can be performed by a mu-meter (dial indicator), and after the edge end surface is leveled, the handle is locked by a positioning pin. The tool 7 can be easily removed by means of the locating pin, and the position of the tool can be determined by means of the position of the locating pin, more specifically the position of the tool shank with respect to the spindle of the machine tool.

In some embodiments, determining the difference Δy in the Y-direction of the nose end face from the central axis of the machine spindle comprises the steps of:

First, determining the highest point of a cutter handle, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the relative coordinate on a mechanical panel as Y0. More specifically, the pointer is pressed to an easily observable value a by using the mu point to the highest point of the shank (the mu point to the shank, the X direction is pulled back and forth, the highest position indicated by the pointer is the highest point of the shank), and the relative coordinate position on the machine panel is set to Y0.

And secondly, determining a point of the end face position of the tool nose, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the coordinate of the point on the mechanical panel relative to the highest point of the tool handle as Y1. More specifically, the relative coordinate position is recorded as Y1 with μ gauge point to the end face position of the blade, gauge needle pressed to the value a.

And thirdly, determining a difference delta Y= (-Y1-r) of the tool tip end surface and the central axis of the machine tool spindle in the Y direction, wherein Y1 is a negative value, and r is the radius of the tool shank. The difference between the tool tip end surface and the central axis of the machine tool spindle is the value which needs to be offset. The shank diameter in this embodiment is Φ40, so Δy= -Y1-20.

In this embodiment, the point at which the highest point of a shank is determined and the point at which the end face position of a nose is determined are both determined using a mu-meter. The position of the tool nose at the center of the sphere can be conveniently found by using a trial cutting method according to a theoretical method, and R of the offset blade after the tool nose position is found is the position of the center of the tool nose circle R at the center of the sphere.

In some embodiments, the position Δx=x1/2-R of the center of the nose circle to the center of the workpiece to be machined in the X direction is determined, where X1 is the distance between the center of the workpiece to be machined and the nose in the X direction, and R is the radius of the nose circle.

More specifically, the tool is leveled and clamped on a table top of the DD motor, the rotation center of the DD motor is found in four sides, and G57 is set as X0Y0. As is clear from the difference between the tool end face and the machine spindle central axis, Δy needs to be added to the coordinate of G57. The method comprises the steps of finding the rotation center of a DD motor in four sides, taking the highest positions of two opposite end surfaces of a rotation shaft by adopting a mu table point, taking the average value of the highest positions, obtaining a middle positioning point, taking the highest positions of the other two opposite end surfaces of the rotation shaft by adopting the mu table point, taking the average value of the highest positions, obtaining another middle positioning point, and obtaining the rotation center of the motor when the two positioning points are overlapped.

After the position of Y0 is determined, the tool nose is positioned on the XZ plane of the rotation center of the DD motor, the machine tool is positioned to Y0, and the tool is finely turned to the sizeIf G57 is set to X0, the position from the center of the nose circle R to the rotation center is Δx= -32.5-1.2= -33.7, and Δx needs to be added to the coordinates of G57.

Note that: Δx is not necessarily the outer circle of Φ65, and if all the tools are turned out to see light, the measurement is recorded as X1 by a micrometer, and G57 is set as X0, Δx=x1/2-1.2.

It should be noted that, the rotation center in this embodiment refers to the rotation center of the rotation shaft connected to the DD motor, and when the workpiece to be processed is positioned on the tool, the rotation center is the center of sphere of the workpiece to be processed.

In some embodiments, the location of the tip circle R center at the center of sphere Z0 is determined. And determining the position delta Z from the center of the tool nose circle to the center of the sphere of the workpiece to be processed in the Z direction.

And (3) turning out the bottom end surface, setting the Z0 coordinate of G57, and adding delta Z=Z1-R to the coordinate value of G57, wherein Z1 is the distance between the center of the tool nose circle and the rotation center of the rotating shaft in the Z direction, and R is the radius of the tool nose circle. More specifically, Δz=18-1.2=16.8 in the present embodiment.

The machining coordinates WCS, i.e. the coordinate position of the center of the sphere with respect to the center of the nose circle R, can be established above.

The main steps of the above steps are completed, the offset X value is set to be 0.2 step pitch, the semi-finishing is set to be 0.1 step pitch, the finishing is set to be 0.005-0.05 step pitch, and the finishing ensures the sizeAnd (5) running a program for trial cutting.

Note that: when a new blade is used for finish machining, the X value is preferably offset by 0.2 for trial cutting, a micrometer is used for measuring the outer diameter after each turning, a machine tool for machining the inner ring can be used as a special machine tool, and the tool is not detachable after the part is machined and inspected to be qualified.

Example 2

The method of processing the revolving body according to the second aspect of the present invention is only a preferred embodiment of the present invention, and the revolving body according to the present invention may be processed by the method according to the second aspect of the present invention, or may be processed by other methods.

The embodiment discloses a processing method of a revolving body, which comprises the following steps:

s10, analyzing the machining content of the revolving body and the positioning tool requirements.

S20, positioning the revolving body on a rotating device.

S30, establishing a machining coordinate system of the center of the tool nose circle at the coordinate position of the sphere center of the revolving body based on the method for determining the center track of the tool nose circle of the tool in the embodiment 1.

S40, offsetting the allowance, programming a machining program based on a machining coordinate system of the center of the cutter point circle at the coordinate position of the center of the revolving body, and carrying out rough machining and/or finish machining on the revolving body through a cutter.

The rotator in this embodiment is a knuckle bearing inner ring 1 or a knuckle bearing outer ring 2. The two parts processing surfaces are only composed of circular arcs, are typical revolution bodies, and have simple structures, but have strict requirements on dimensional accuracy and surface roughness of the diameter size. The critical dimensions are the spherical diameter and spherical shape (line profile) of the two parts.

The structure of the knuckle bearing inner ring 1 is shown in fig. 2, the structure of the knuckle bearing outer ring 2 is shown in fig. 3, and both parts are parts of a revolution body type, one is an outer spherical surface, and the other is an inner spherical surface. The parts belong to medium-small parts, and are easy to detach and install. The precision grade of the two parts is higher, and the machining on a common screw machine tool is difficult to guarantee the dimensional precision, so that the latest linear motor machine tool S7 series is selected and used in the embodiment, the defects that screw transmission cannot be overcome are eliminated, the precision is high, the speed is high, the surface quality is good, the flexible machining performance is better, the flexible wire is relatively suitable for machining parts with higher precision, batch production can be realized, and automatic machining of flexible wires can be realized.

The step S10 comprises the steps of analyzing the machining content and the tooling requirement of the inner ring and analyzing the machining content and the tooling requirement of the outer ring.

S101, analyzing machining content of inner ring and positioning tool requirements

In order to guarantee technical requirements, the most critical is to find a positioning reference. Meanwhile, the improvement of the product productivity, the reduction of the labor intensity and the improvement of the economic benefit of enterprises are considered. From the part drawings, it can be seen that: the inner ring is a highly symmetrical part, the precise size is only the middle inner hole size, and the inner ring is highly processed in place. Thus being positioned with the inner bore of the middle phi 65 and one bottom surface. The diameter of the cylinder of the tool is a precise size, the tool is required to be made into a special tool, and the tool is directly finished on a machine tool and matched with a part.

S102, analyzing machining content of outer ring and positioning tool requirements

The tool is mainly used for processing the inner spherical surface, and the dimensional tolerance requirement is required to be met during processing. In order to guarantee technical requirements, the most critical is to find a positioning reference. Meanwhile, the improvement of the product productivity, the reduction of the labor intensity and the improvement of the economic benefit of enterprises are considered.

From the part drawings, it can be seen that: the inner spherical surface of the outer ring is also a rotating surface, and besides the high machining in place, only the large surface limits three degrees of freedom, so that a precise positioning reference needs to be machined, and an inner hole is finely bored to serve as the positioning reference.

S201, positioning the inner ring of the knuckle bearing on a rotating device

The cutting force of turning is not very big, and the work piece is difficult to turn after compressing tightly, so with big face as the benchmark, the frock is both to be fixed a position easily and will find the exact position when the part is not dismantled, figure 4 is the first frock of joint bearing inner ring, joint bearing inner ring is fixed a position through first frock 3, the frock is by big face and cylinder (long cylindric lock) location, three degree of freedom is restricted to big face, respectively the removal in the Z direction, rotation in X and Y direction, the cylinder restriction X and Y direction removes, because the turning, rotate around the Z axle, Z axle rotatory degree of freedom need not control, utilize taking tapering round platform 5 to "bulge" with the part frock in order to reach the effect of locking fixed part. The bottom of the conical round table 5 is positioned by a locking screw 6. Note that: during clamping, the tool or the part is prevented from plastic deformation by tightening the torque wrench with scales, and the cylinder is tightly matched with the part.

S202, positioning the outer ring of the knuckle bearing on a rotating device

Fig. 5 shows a first tooling scheme of the outer ring of the knuckle bearing, wherein the outer ring of the knuckle bearing is positioned by a second tooling 4, and the scheme is that the outer ring of the knuckle bearing is pressed onto a bottom plate 42 by an end cover 41 with an open top end, and the end cover and the bottom plate are locked and positioned. The tool is positioned by a large surface and a column body (long cylindrical pin), wherein the large surface limits three degrees of freedom, namely movement in the Z direction and rotation in the X and Y directions, the column body limits the movement in the X and Y directions, two positioning pins limit the rotation of the Z axis, only one pin is inserted during clamping, 0.05 is reserved after the inner ball is turned, and a cylindrical opening of phi 90B2 is processed by the alignment pin hole. The clamp adopts one-side two-pin positioning, has high positioning precision, the clamping surface is arranged on the whole end surface, the stress surface is larger, and the clamp is stable and is not easy to deform.

When designing the frock of outer lane, owing to be the processing inside groove, need consider the drainage and cut the problem, consequently when designing the frock, mill 4 water drainage grooves in the bottom. The water drainage groove in the embodiment is used for timely discharging liquid in the processing process, and the influence of the liquid on the cutter is avoided.

Fig. 6 shows a second tooling scheme of the outer ring of the knuckle bearing, wherein the positioning mode and the processing method are the same as those of the first scheme, but the pressing mode is different. The scheme is that a plurality of locating pieces 43 are arranged along the grooves of the outer ring of the knuckle bearing, and the outer ring of the knuckle bearing is located on a bottom plate by the locating pieces 43. However, this protocol has fewer pinch points and requires stability to be measured. It should be noted that the parts must not be crushed during clamping.

S401, before rough machining and/or finish machining are carried out on the revolving body, the method further comprises the step of confirming a machining route of an inner ring or an outer ring of the knuckle bearing.

S4011, determining a process route

For parts to be mass produced, a unified reference is generally first machined. The bottom surfaces and the top surfaces of the two parts are machined in place, and the inner ring is already machined with an inner hole and can be used as a positioning reference; the outer ring is required to be processed with a positioning reference hole, so that two parts to be processed have unified references, and time waste for finding the references each time is avoided. The inner ring is only provided with one outer sphere, and only one procedure is needed, and the tool cannot be cut into the tool in the processing process; the outer ring is provided with an inner spherical surface and a cylindrical opening, and the two procedures are two. All process arrangements should follow the principle of coarse-fine separation.

S4012 arrangement of process sequences

After the processing method is determined, the sequence of the technological process is determined according to the specific production conditions such as the production type, the structural characteristics of the parts, the technical requirements, the machine tool equipment and the like. Basic principles of process sequence arrangement are determined:

1) Firstly processing the reference surface and then processing other surfaces

In order to ensure certain positioning accuracy, when the accuracy requirement of the processed surface is very high, the fine reference should be finished before finish machining.

The machining of the inner ring and the outer ring must first determine the precise reference of the blank, and then the machining is based on the reference.

2) Typically, the holes are machined after the plane is machined

When a larger plane on the part can be used as a positioning reference, the part can be firstly processed to be used as a positioning surface so as to position the processing hole. Therefore, stable and accurate positioning can be ensured, and workpiece clamping is convenient.

The upper and lower surfaces of the inner ring and the outer ring are machined in place, and the inner hole of the inner ring is also machined in place, so that the machining standard can be determined.

3) Machining the primary surface first and machining the secondary surface second

Major surfaces refer to design reference surfaces and major working surfaces, while minor surfaces refer to keyways, threads, and other surfaces.

4) Firstly, a rough machining process is arranged, and then a finish machining process is arranged

In the comprehensive analysis of the above principle and the structural characteristics of the inner ring and the outer ring, the approximate process sequence of the inner ring processing is as follows: ① . Roughly turning an outer circle; ② . And (5) finely turning the excircle.

The general process sequence of the outer ring processing is as follows: ① . Finely boring a reference hole phi 102.3; ② . Positioning the rough turning inner circle by using the reference hole; ③ . Finish milling an open slot of phi 90B2 and back-off; ④ . Finely turning the inner circle.

In general, in small lot production of single parts, the process is often properly concentrated to simplify the production management. If the device is used as a special device, the centralized management of the working procedures can be completely realized. The special equipment and the simple fixture are adopted to organize the assembly line production, after the processing procedure is finished, the workpiece is cleaned, and the cleaning is carried out in a solution containing 0.4 to 1.1 percent of soda and 0.25 to 0.5 percent of sodium nitrite at the temperature of 80 to 90 ℃. After cleaning, the waste is blown clean by compressed air. The residual amount of impurities, scrap iron, burrs, sand grains and the like in the parts is not more than 200mg.

S4013 dividing processing stages

The processing quality of the parts is high, so we divide the processing process into several stages:

1) Rough machining stage

The purpose of rough machining is to remove most of more metal, create better conditions for the later finish machining, provide positioning reference for semi-finish machining, and can discover the defects of blanks early in rough machining and discard or repair so as to avoid wasting working hours.

The rough machining can be performed by a machine tool with high power and good rigidity, and a large pre-cutting dosage is selected to improve the productivity, and when in rough machining, the cutting force is large, the cutting heat is large, the required clamping force is large, so that the internal stress and deformation generated by the workpiece are large, the machining precision is low, and the roughness value is large.

2) Semi-finishing stage

The semi-finishing stage is to finish some secondary surfaces and prepare them for finishing the primary surfaces, ensuring a proper machining margin.

3) Finishing stage

The main purpose of cutting off the residual small machining allowance in the finishing stage is to ensure the shape and position precision, the dimensional precision and the surface roughness of the part, so that all main surfaces meet the drawing requirements. In addition, the finishing process is arranged at the end, so that the damage of the finished surface of the workpiece can be prevented or reduced.

The finish machining adopts a high-precision machine tool with small cutting amount and small working procedure deformation, thereby being beneficial to improving the machining precision.

In addition, after the processing stages are divided, the reasonable arrangement of the heat treatment process is also facilitated. Due to the different heat treatment properties, some are arranged before the roughing and some are interposed between the roughing and finishing.

However, it should be noted that the division of the machining stages is not absolute, and in real life, for workpieces with good rigidity, low precision requirement or small batch, and heavy parts with complicated transportation and clamping are often not strictly divided into the stages, and on the premise of meeting the machining quality requirement, the machining stages are generally divided into coarse and fine machining stages, and even coarse and fine machining is not separated. The clear division of the stages is meant to indicate that the whole process cannot be distinguished by the nature of a certain surface process or a certain procedure.

The surface allowance of the two processed parts is only about 0.5mm, and the positioning reference is accurate, so that the workpiece can be cut with small cutting quantity, and the workpiece is firstly semi-finished and then finished.

S4014 determination of processing route

Under the technical conditions of ensuring the dimensional tolerance, the form and position tolerance, the surface roughness and the like of parts, the mass production can be considered to adopt a special machine tool so as to improve the productivity. But simultaneously, the economic effect and the actual equipment are considered, the production cost is reduced, and the following processing technology route scheme is proposed.

1. Inner ring process route

Step1: roughly turning the outer circle of the part, ensuring the external dimension Sphi 90 (+ 0.05/+0.1), and taking a reference hole of phi 65 as a reference;

and 2, a step of: finishing turning blade (note that multiple offset of 0.2 is needed, trial cutting is needed), single side reservation of 0.02 in semi-finishing is carried out, and reference hole phi 65 is used as reference;

And step 3: finish turning the profile, the step pitch is offset by 0.005, and the dimension SΦ90 (-0.034/-0.012) is finally ensured, with reference to the reference hole of phi 65.

2. Outer ring process route

Step 1: finely boring a reference hole of phi 102.3, wherein the dimension phi 102.3 (+ 0.02/+0.04) is ensured;

and 2, a step of: roughly turning the inner circle of the part, ensuring the external dimension Sphi 90 (0.12/+0.15), and taking a phi 102.3 hole as a reference;

and step 3: straightening the two pin holes, roughly milling an open slot of phi 90B12, and ensuring the dimension phi 90 (+ 0/+0.15);

And 4, a step of: straightening the two pin holes, finish milling an open slot of phi 90B12, and ensuring the dimension phi 90 (+ 0.22/+0.57);

And a step 5 of: finish milling and back-off;

and a step 6 of: finish turning the inner circle, the step pitch is offset by 0.005, and the final guarantee size SΦ90 (0/+0.035) is based on the phi 102.3 hole.

S402, selecting a cutter

The selection principle of the cutter 7 is as follows: 1) The cross section size of the cutter bar is selected as large as possible, and the strength and the rigidity of the cutter are enhanced by the shorter length size, so that the vibration of the cutter is reduced; 2) Selecting a larger principal deflection angle (greater than 75 °, approaching 90 °); a negative-edge dip angle cutter is selected during rough machining, and a positive-edge dip angle cutter is selected during finish machining; 3) During finish machining, a non-coated blade and a small arc radius of a tool nose are selected; 4) Selecting standard variation and systematic cutters as much as possible; 5) The correct, fast clamping tool shank is selected.

According to the size of the part and the addition content of the part, the embodiment is specially used for customizing a CBN turning tool, the R angle at the top of the blade is R1.2, and compared with other cutters made of other materials, the CBN turning tool has the following advantages:

The CBN cutter has high self-hardness and excellent wear resistance, realizes high-speed cutting, has longer service life, and is suitable for processing high-hardness workpieces with the hardness of more than HRC 45;

The impact toughness and fracture resistance are strong, the metal cutting rate is high, and the workpiece with the intermittent machining rate of more than HRC60 does not collapse;

And thirdly, the cutting performance is more stable, the double cutting edges are more economical, and the processes of turning instead of grinding and the like can be realized.

In addition, the cutter in the embodiment is a vertical cutter and does not rotate along a main shaft of the machine tool, so that the cutter is ensured not to deflect, and the cutter can process the revolving body strictly according to a processing route.

As shown in fig. 9, the tool 7 is positioned on a shank 8, and the shank 8 is a shaped shank. The shank 8 includes a shank body and a shank shaft 82. The shape of the cutter handle body is special. In order to provide a mounting position of the tool 7, a tool positioning groove 81 for positioning the tool 7 is provided in the shank 8. Because the diameter of the shank is small, the shank needs to bear cutting force after the cutter is mounted to the cutter positioning groove 81, so the shank at the cutter positioning groove often has a certain thickness, and when the cutter is positioned to the cutter positioning groove 81, a distance exists between the cutter tip end surface and the machine tool spindle in the Y direction. On the other hand, the tool is not required to be positioned in the tool positioning groove 81, and the end face of the tool tip of the tool is positioned at the center of the spindle of the machine tool, and the position of the tool can be calibrated only after the tool is positioned. Therefore, when the tool is positioned in the tool positioning groove 81, there is a distance in the Y direction between the edge face and the spindle of the machine tool.

As shown in fig. 10 and 11, the shank shaft 82 is positioned on the shank positioning seat, the machine tool spindle 10 is disposed inside the machine tool spindle housing 11, the top of the shank positioning seat 9 is provided with a boss 91, the boss 91 is inserted inside the machine tool spindle housing 11 and has a distance from the machine tool spindle 10, the side of the shank positioning seat 9 is fixedly connected with the machine tool spindle housing 11 through the locking member 12, the bottom end of the shank positioning seat 9 is provided with a groove, and the shank shaft 82 is fixed in the groove of the shank positioning seat. When the main shaft of the machine tool rotates, the tool handle 8 and the tool 7 cannot rotate, so that the tool is used as a vertical turning tool.

The cutter positioning groove 81 is formed in the cutter handle body and the positioning block 83 in an outward extending mode, so that the contact area between the cutter and the cutter handle is increased, and the possibility of breakage of the cutter can be effectively avoided.

S403, determining the cutting dosage

The cutting speed, the feeding amount and the back cutting amount are required to be selected for each cutting process, and the cutting amount has very close relation with the production efficiency, the processing quality and the processing cost, so that the most reasonable cutting amount is required.

A) Basic principle of cutting amount selection in rough machining:

High productivity in roughing is a fundamental goal pursued; this goal is often expressed in terms of minimum single piece maneuvers or maximum volume of metal cut per unit time.

Therefore, during rough machining, under the condition that a machine tool and a cutter meet the use requirement, firstly, the maximum back cutting amount is selected, secondly, the feeding amount which is as large as possible is selected on the premise that the power and the rigidity of the machine tool allow, and finally, the cutting speed is determined after the reasonable numerical value of the service life of the cutter is ensured.

B) Basic principle of cutting amount selection in finish machining:

The cutting amount during finish machining is mainly used for ensuring the machining quality, and the productivity and the necessary service life of the cutter are taken into consideration; the back cutting amount of the finish machining is small, the generated cutting force is not large, and the back cutting amount is selected to meet the rigidity requirement of a process system. The feed rate is mainly limited by the surface roughness, and a smaller value is also selected for improving the surface quality of the workpiece. The finish machining mostly adopts higher cutting speed, so that the machining efficiency can be improved, and the service life of the cutter is also considered.

And calculating the cutting amount, wherein the cutting parameters of the rough turning and the finish turning of the inner ring and the outer ring can be consistent, so that the cutting amount of the inner ring is calculated in the turning step.

S404, machining a revolving body by using an actual manipulator

And the method analyzes how to enable the turning tool to have a certain position on the main shaft of the machine tool, so that the machine tool has a certain direction and is convenient to assemble and disassemble. The position of the turning tool is determined by a locating pin.

S4041 method for analyzing processing of two gyrorotors

When Y is 0, an arc interpolation program is compiled on the XZ plane, the compiled outline is the outline track of the center of the tool nose circle R, and the established processing coordinates are the center of the sphere center relative to the tool nose circle R, so that the position of the center of the tool nose circle R in the sphere center is critical in the processing process. And after the center position of the tool nose circle R is found, the allowance is offset in the positive direction of the X axis to carry out rough machining and finish machining.

S4042 finding the position of the center of the tool nose R at the center of the sphere (establishing WCS processing coordinates)

The first step: determination of X0, Y0

In establishing WCS, since the tool is a non-standard turning tool, it is first determined whether the end face of the blade is on the central axis of the machine tool spindle.

The determining method comprises the following steps: the diameter of the cutter handle is phi 40, and the distance from the highest point of the cutter handle to the end face of the blade is punched by using a mu meter.

The relative coordinate position on the mechanical panel is set as Y0 by pressing the gauge needle to an easily observable value a from the mu gauge point to the highest point of the shank (the mu gauge point is used to the shank, the gauge is pulled back and forth in the X direction, and the highest position indicated by the gauge needle is the highest point of the shank).

The relative coordinate position is recorded as Y1 by using mu gauge point to the end face position of the blade and pressing the gauge needle to the value a.

The position of the end face of the blade on the central axis of the machine tool spindle is determined, and the difference between the end face of the blade and the central axis of the machine tool spindle is the value required to be offset as shown in the previous two steps, namely, delta Y= -Y1-20.

The position of the tool nose at the center of the sphere can be conveniently found by using a trial cutting method according to a theoretical method, and R of the offset blade after the tool nose position is found is the position of the center of the tool nose circle R at the center of the sphere.

The tool is leveled and clamped on the table top of the DD motor, the rotation center of the DD motor is found in four sides, and G57 is set as X0Y0. As is clear from the difference between the tool end face and the machine spindle central axis, Δy needs to be added to the coordinate of G57. The DD motor is a direct drive motor, and the coordinates of the center of the tool nose R at the center of the sphere as the origin of coordinates are determined.

After the position of Y0 is determined, the tool nose is positioned on the XZ plane of the rotation center of the DD motor, the machine tool is positioned to Y0, and the tool is finely turned to the sizeIf G57 is set to X0, the position from the center of the nose circle R to the rotation center is Δx= -32.5-1.2= -33.7, and Δx needs to be added to the coordinates of G57.

It should be noted that Δx is not necessarily an outer circle of Φ65, and if all the tools are turned out to emit visible light, the measurement is recorded as X1 by using a micrometer, and G57 is set as X0, Δx=x1/2-1.2.

Second, determining the position of the center of the tool tip circle R at the center Z0

And turning out the bottom end surface, setting the Z0 coordinate of G57, and adding the deltaZ=18-1.2=16.8 to the coordinate value of G57.

The machining coordinates WCS, i.e. the coordinate position of the center of the sphere with respect to the center of the nose circle R, can be established above.

The main steps of the above steps are completed, the offset X value is set to be 0.2 step pitch, the semi-finishing is set to be 0.1 step pitch, the finishing is set to be 0.005-0.05 step pitch, and the finishing ensures the sizeAnd (5) running a program for trial cutting.

Note that: when a new blade is used for finish machining, the X value is preferably offset by 0.2 for trial cutting, a micrometer is used for measuring the outer diameter after each turning, a machine tool for machining the inner ring can be used as a special machine tool, and the tool is not detachable after the part is machined and inspected to be qualified.

After the processing method and the interpolation instruction of the numerical control program are obtained, the track program of the center of the tool nose R relative to the center of the sphere can be quickly compiled.

On the other hand, as shown in fig. 8, when another machine tool is used to machine the knuckle bearing outer ring, the machining method and the method of establishing machining coordinates are identical to those of the knuckle bearing inner ring, and each one-turning one-knife is measured by an inside dial gauge and assembled by an inner ring.

During clamping, cylindrical pins are inserted, the outer ring is positioned, after spherical semi-finishing (single side is reserved for 0.05), the spherical semi-finishing is performed, the two cylindrical pins are used for straightening, and an open slot is finished and the outer ring is reversely buckled.

The invention correctly determines the positioning scheme and the clamping scheme, performs error analysis and calculation, and ensures the machining precision of the workpiece; the structure is simpler, and the manufacturing cost is low; the installation datum surface of the tool body is large in area and high in surface quality, so that the assembly precision is high; the designed tool is convenient to operate and safe to work, and reduces the labor intensity of workers.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (13)

1. The method for determining the center track of the tool nose circle of the tool is characterized by comprising the following steps of:

controlling the end face of the cutter point to be vertical to the Y axis; determining a difference delta Y between the end face of the tool nose and the central axis of the machine tool main shaft in the Y direction, and judging whether the end face of the tool nose and the central axis of the machine tool main shaft are coplanar or not based on the difference delta Y;

when the difference delta Y is zero, determining that the end face of the tool nose is coplanar with the central axis of the main shaft of the machine tool, and directly programming a tool nose circle center track program;

when the difference value delta Y is not zero, the end face of the tool nose is not coplanar with the central axis of the main shaft of the machine tool, and the value of the required offset of the established machining coordinate system in the Y direction is determined based on the difference value delta Y; determining the position delta X of the center of the tool nose circle to the center of the workpiece to be processed in the X direction, determining the position delta Z of the center of the tool nose circle to the center of the workpiece to be processed in the Z direction, taking the center of the workpiece to be processed as an origin, establishing a processing coordinate system of the center of the tool nose circle at the coordinate position of the center of the workpiece to be processed, and compiling a contour track program of the center of the tool nose circle at the center of the workpiece to be processed.

2. The method for determining the center locus of a tool nose circle according to claim 1, wherein determining the difference Δy between the end face of the tool nose and the center axis of the spindle of the machine tool in the Y direction comprises the steps of:

determining the highest point of a cutter handle, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the relative coordinate on a mechanical panel as Y0;

determining a point of the end face position of a tool nose, detecting the coordinate of the point in the Y direction by using a grating ruler, and setting the coordinate of the point on the mechanical panel relative to the highest point of the tool handle as Y1;

And determining a difference delta Y= (-Y1-r) of the tool tip end surface and the central axis of the machine tool spindle in the Y direction, wherein Y1 is a negative value, and r is the radius of the tool handle.

3. The method for determining the center locus of a tool nose circle according to claim 2, wherein the point for determining the highest point of a tool shank and the point for determining the position of an end face of a tool nose are determined by using a μ table.

4. The method for determining the center locus of a tool nose circle according to claim 2, wherein the position Δx=x1/2-R of the center of the tool nose circle to the center of the sphere of the workpiece to be processed in the X direction is determined, where X1 is the distance between the center of the sphere of the workpiece to be processed and the tool nose in the X direction, and R is the radius of the tool nose circle.

5. The method for determining the center locus of a tool nose circle according to claim 3, wherein the position Δz=z1-R of the center of the nose circle to the center of the sphere of the workpiece to be processed in the Z direction is determined, where Z1 is the distance between the center of the nose circle and the center of the sphere of the workpiece to be processed in the Z direction, and R is the radius of the nose circle.

6. A method for processing a revolving body is characterized by comprising the following steps:

positioning the rotor onto a rotating device;

Establishing a processing coordinate system of the center of the tool nose circle at the coordinate position of the sphere center of the revolving body based on the method for determining the center track of the tool nose circle of the tool according to any one of claims 1 to 5;

And (3) offsetting the allowance, programming a machining program based on a machining coordinate system of the center of the cutter point circle at the coordinate position of the center of the revolving body, and carrying out rough machining and/or finish machining on the revolving body through a cutter.

7. The method for machining a rotor according to claim 6, wherein the rotor is a knuckle bearing inner ring or a knuckle bearing outer ring.

8. The method for machining a revolving body according to claim 7, wherein the knuckle bearing inner ring is positioned by a first tool, and the specific positioning process is as follows:

and expanding the central hole of the inner ring of the knuckle bearing by using the conical round table, and locking and positioning the conical round table and the inner ring of the knuckle bearing to the first tool.

9. The method for machining a revolving body according to claim 7, wherein the knuckle bearing outer ring is positioned by a second tool, and the specific positioning process is as follows:

the outer ring of the knuckle bearing is pressed onto the bottom plate by utilizing an end cover with an opening at the top end, and the end cover and the bottom plate are locked and positioned;

Or a plurality of locating pieces are arranged along the grooves of the outer ring of the knuckle bearing, and the outer ring of the knuckle bearing is located on the bottom plate by the locating pieces.

10. The method for machining a rotary body according to claim 7, further comprising the step of confirming a machining route of the knuckle bearing inner ring or the knuckle bearing outer ring before the rotary body is roughed and/or finished:

Determining a processing route of an inner ring of the knuckle bearing: roughly turning the outer circle of the inner ring of the knuckle bearing, ensuring the external dimension and determining the reference position; a blade is finely turned, and semi-finish machining is carried out on the outer circle of the inner ring of the knuckle bearing; reducing the offset allowance, and carrying out finish machining on the outer circle of the inner ring of the knuckle bearing;

Determining a machining route of the outer ring of the knuckle bearing: finely boring a reference hole of an outer ring of the knuckle bearing; roughly turning the inner circle of the outer ring of the knuckle bearing; straightening the pin hole and roughly milling an open slot; finish milling and back-off; reducing the offset allowance and finely turning the inner circle of the outer ring of the knuckle bearing.

11. The method for machining a rotary body according to any one of claims 6 to 10, characterized in that the tool is a CBN turning tool;

And/or the cutter is a vertical cutter;

and/or the tool nose circle at the end part of the tool is contacted with the revolving body and processes the revolving body.

12. The method for machining a revolving body according to any one of claims 6 to 10, characterized in that the tool is positioned on a tool shank, the tool shank is a profiled tool shank, and a tool positioning groove for positioning the tool is formed in the tool shank;

The tool handle is fixed on the tool handle positioning seat, and the tool handle positioning seat is fixedly connected with the machine tool spindle shell so that the tool and the tool handle do not rotate along with the machine tool spindle.

13. The method according to any one of claims 6 to 10, characterized in that the rotator is driven by a direct-drive motor, an output shaft end of which is connected to a rotation shaft, and the rotation shaft is connected to a tool for positioning the rotator.