A method of grinding a plurality of compound bevels

Abstract

The present application relates to a kind of grinding methods of multiple complex bevels, comprising the following steps: S1.the intersection of first bevel and second bevel is positioned;S2.rotate the part so that its intersection is parallel to longitudinal axis;S3.according to the included angle θ of first bevel and second bevel, the included angle ∠1 of first bevel and horizontal axis, the included angle ∠2 of second bevel and horizontal axis, design the outer shape of grinding wheel, so that the included angle of its outer shape line is θ;S4.clamp the part, rotate the grinding wheel, the rotation angle of grinding machine grinding platform is ∠1+π / 2‑θ / 2 while rotating around longitudinal axis and feeding grinding along longitudinal axis direction.The present application can process multiple complex bevels simultaneously, not only improve processing efficiency, and can effectively improve processing precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machining, in particular to a grinding method for multiple composite bevels. BACKGROUND

[0002] There are many composite bevels in the turbine blades of an aero-engine, such as the turbine blade crown meshing surface and the guide vane back plate surface, and the precision requirements of multiple composite bevels are relatively high for assembly size, and the processing difficulty is great.

[0003] A square tube multiple composite bevel milling method is disclosed in the prior application document CN112719379B, which provides a thought that the composite bevel is rotated in parallel with the spindle of the machine tool, projected into a contour line in the direction of the spindle, and milled along the contour line. After processing a composite bevel, the above process is repeated to process the next composite bevel, and the parallel composite bevels can be combined. In the above invention specification, the angle of rotation of the composite bevel is not explained how to determine, and each composite bevel is processed separately (parallel surfaces are combined), the processing time is long, the precision of the machine tool is high, and it is difficult to guarantee the size relationship between the composite bevels, the surface roughness of the processing is not good, and the requirement for the operator programming is high.

[0004] Therefore, the technical personnel in the art are committed to developing a grinding method for multiple composite bevels, which can process multiple composite bevels at the same time, not only improves the processing efficiency, but also effectively improves the processing precision. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a grinding method for multiple composite bevels, which can process multiple composite bevels at the same time, not only improves the processing efficiency, but also effectively improves the processing precision.

[0006] The technical solution of the present application to solve the above technical problem is as follows: a grinding method for multiple composite bevels, comprising the following steps:

[0007] S1. Positioning the intersection line of the first bevel and the second bevel;

[0008] S2. Rotating the part so that the intersection line is parallel to the longitudinal axis;

[0009] S3. Designing the outer shape of the grinding wheel according to the included angle θ of the first bevel and the second bevel, the included angle ∠1 of the first bevel and the horizontal axis, and the included angle ∠2 of the second bevel and the horizontal axis, so that the included angle of the outer contour line of the grinding wheel is θ;

[0010] S4. Clamping the part, rotating the grinding wheel, and rotating the grinding wheel around the longitudinal axis and feeding the grinding wheel in the longitudinal direction. The rotation angle of the grinding wheel is ∠1+π / 2-θ / 2.

[0011] The beneficial effects of the present application are: according to the spatial geometry theory, the azimuth angle and intersection line of the first inclined surface and the second inclined surface are analyzed, the real angle of the spatial dihedral angle is calculated, the grinding wheel profile is designed, the spatial angle of the intersection line of the two inclined surfaces and the angle of the projected straight line on the reference plane are calculated, the motion parameters of the grinding machine are determined, the profile of the grinding wheel is matched with the intersection line of the first inclined surface and the second inclined surface, so that the first inclined surface and the second inclined surface can be machined at the same time, the machining efficiency is improved, and the machining precision is effectively improved.

[0012] Based on the above technical solutions, the present application can be further improved as follows.

[0013] Further, in step S3, the grinding wheel is formed by roller grinding, the left profile and the right profile of the roller are designed according to the included angle θ of the first inclined surface and the second inclined surface, so that the included angle between the left profile and the right profile of the roller is θ, the included angle between the left profile and the horizontal axis is ∠3, the included angle between the right profile and the horizontal axis is ∠4, and ∠3=∠4.

[0014] The beneficial effects of the above further scheme are that ∠3=∠4 not only ensures the grinding performance of the grinding wheel, but also further improves the grinding precision.

[0015] Further, in step S4, the rotation angle of the grinding table of the grinding machine is ∠1+∠3.

[0016] The beneficial effects of the above further scheme are that the included angle between the inclined surface and the longitudinal axis and the included angle between the grinding wheel and the longitudinal axis determine the rotation angle of the grinding table of the grinding machine, and further improve the grinding precision.

[0017] Further, in step S2, the intersection line is projected onto the horizontal plane to obtain a projection line, the angle between the projection line and the horizontal axis is w, the angle between the projection line and the intersection line is γ, the part is rotated by π / 2-w around the vertical axis, at this time the projection line is parallel to the longitudinal axis, and then the part is rotated by γ around the horizontal axis, so that the intersection line is parallel to the longitudinal axis.

[0018] The beneficial effects of the above further scheme are that the intersection line is parallel to the longitudinal axis according to the spatial geometry theory, and the grinding efficiency is further improved.

[0019] Further, in step S3, after the outer profile angle of the grinding wheel is manufactured, it needs to be rounded.

[0020] The beneficial effects of the above further scheme are that the surface profile of the grinding wheel has a rounding, and the surface grinding precision of the part is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a flowchart of a specific embodiment of the present application;

[0022] Figure 2 It is a schematic view of the first inclined surface and the second inclined surface of the first embodiment of the present application;

[0023] Figure 3 Figure 1 is a schematic diagram of the first inclined surface and the second inclined surface according to an embodiment of the present application;

[0024] Figure 4 Figure 2 is a schematic diagram of the roller and the horizontal shaft according to an embodiment of the present application;

[0025] Figure 5 Figure 3 is a schematic diagram of the grinding feed according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "length", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the system or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] As shown in Figure 1 , Figure 2 , a grinding method of a plurality of composite inclined surfaces, comprising the following steps:

[0031] S1. Positioning the intersection of the first inclined surface and the second inclined surface;

[0032] S2. Rotate the part so that the intersection line is parallel to the longitudinal axis. Specifically, project the intersection line onto the horizontal plane to obtain a projection line, the angle between the projection line and the transverse axis is w, the angle between the projection line and the intersection line is γ, rotate the part around the vertical axis by π / 2-w, at this time the projection line is parallel to the longitudinal axis, then rotate the part around the transverse axis by γ angle, so that the intersection line is parallel to the longitudinal axis.

[0033] S3. According to the included angle θ between the first inclined surface and the second inclined surface, the included angle ∠1 between the first inclined surface and the transverse axis, and the included angle ∠2 between the second inclined surface and the transverse axis, design the outer shape of the grinding wheel, so that the outer shape line of the grinding wheel has an included angle θ, after the outer shape line of the grinding wheel is designed, in order to further guarantee the grinding performance and improve the surface grinding precision of the part, it is also necessary to round off.

[0034] Specifically, the grinding wheel is formed by a roller, according to the included angle θ between the first inclined surface and the second inclined surface, the left profile line and the right profile line of the roller are designed, so that the included angle between the left profile line and the right profile line of the roller is θ, the included angle between the left profile line and the transverse axis is ∠3, the included angle between the right profile line and the transverse axis is ∠4, and ∠3=∠4.

[0035] S4. Clamping the part, rotating the grinding wheel, rotating the grinding wheel around the longitudinal axis, and feeding the grinding along the longitudinal axis direction, the rotation angle of the grinding wheel is ∠1+π / 2-θ / 2. Specifically, the rotation angle of the grinding wheel is ∠1+∠3.

[0036] According to the spatial geometry theory, the azimuth angle, intersection line and other information of the first inclined surface and the second inclined surface are analyzed, the real angle of the spatial dihedral angle is calculated, the grinding wheel profile is designed, the spatial angle of the intersection line of the two inclined surfaces and the angle of the straight line projected on the reference plane are calculated, and the movement parameters of the grinding machine are determined, so that the profile line of the grinding wheel matches the intersection line of the first inclined surface and the second inclined surface, thereby the first inclined surface and the second inclined surface can be machined at the same time, not only the machining efficiency is improved, but also the machining precision is effectively improved.

[0037] Example one

[0038] As shown in Figure 2 S1. Position the intersection line of the first inclined surface and the second inclined surface. Specifically, the direction of the grinding wheel spindle (also the rotation axis of the grinding wheel) is the X axis, the five-axis grinding machine rotary table can rotate around the Z axis and the Y axis, and move along the ZYZ direction, the three-axis grinding machine can move along the XYZ direction. The two compound inclined surfaces ABCD and AEFD are the first inclined surface and the second inclined surface respectively, the intersection line of the first inclined surface and the second inclined surface is AD, the projection line of AD on the XOY plane is A'D', the included angle between A'D' and the X axis is w, and the included angle between A'D' and AD is γ.

[0039] As shown in Figure 2 , Figure 3As shown, S2. Rotate the part so that the intersection line is parallel to the longitudinal axis. Specifically, project the intersection line onto the horizontal plane to obtain a projection line, the angle between the projection line and the transverse axis is w, the angle between the projection line and the intersection line is γ, rotate the part around the vertical axis by π / 2-w, at this time the projection line is parallel to the longitudinal axis, then rotate the part around the transverse axis by γ angle, so that the intersection line is parallel to the longitudinal axis.

[0040] In a specific embodiment, the part structure is imported by using drawing software UG, the intersection line AD of the first inclined surface and the second inclined surface is drawn, the intersection line AD is projected on the XOY plane to obtain A'D', the angle between A'D' and the X axis is w, and the angle between A'D' and AD is γ. Rotate the part around the Z axis by π / 2-w angle, at this time A'D' is parallel to the Y axis; then rotate the part around the X axis by γ angle, at this time AD is parallel to the Y axis. The fixture is designed for this state of the part, the bottom surface of the fixture bottom plate is parallel to the XOY plane, and the side surface is parallel to the XOZ and YOZ planes, so as to facilitate the fixture and the grinding machine to be aligned. Then select appropriate positioning points and clamping, connect with the bottom plate, and perform normal fixture design. In this state, the intersection line AD of the first inclined surface and the second inclined surface is parallel to the Y axis, the intersection line AD of the first inclined surface and the second inclined surface is perpendicular to the XOZ, the real included angle θ of the first inclined surface and the second inclined surface can be measured, the included angle ∠1 of the first inclined surface and the X axis, and the included angle ∠2 of the second inclined surface and the X axis.

[0041] As shown in Figure 4 S3. According to the included angle θ of the first inclined surface and the second inclined surface, the included angle ∠1 of the first inclined surface and the transverse axis, and the included angle ∠2 of the second inclined surface and the transverse axis, the outer shape of the grinding wheel is designed, so that the outer shape line of the grinding wheel has an included angle θ. After the outer shape line of the grinding wheel is designed, in order to further ensure the grinding performance and improve the surface grinding precision of the part, rounding is also needed.

[0042] Specifically, the grinding wheel is formed by roller grinding, the left profile line and the right profile line of the roller are designed according to the included angle θ of the first inclined surface and the second inclined surface, so that the included angle between the left profile line and the right profile line of the roller is θ, the included angle of the left profile line and the transverse axis is ∠3, the included angle of the right profile line and the transverse axis is ∠4, and ∠3=∠4, the rounding is R, and the value of R is determined according to the actual inclined surface to be ground.

[0043] S4. The part is clamped, the grinding wheel is rotated, the grinding machine grinding table is rotated around the longitudinal axis, and the grinding machine grinding table is fed in the longitudinal axis direction. The rotation angle of the grinding machine grinding table is ∠1+π / 2-θ / 2. Specifically, the rotation angle of the grinding machine grinding table is ∠1+∠3.

[0044] As shown in Figure 5As shown, after the designed clamp is aligned with the grinder bed and connected and compressed, the grinder spindle direction (i.e. the rotation axis of the grinding wheel) is the X axis, and the five-axis grinder rotary table can rotate around the Y axis. Under the positioning of the clamp, the intersection AD of the first inclined surface and the second inclined surface is parallel to the Y axis. The five-axis grinder rotary table is rotated around the Y axis by an angle of ∠1+∠3, so that the roller curve is consistent with the first inclined surface and the second inclined surface curve. The tool is adjusted to the accurate position, and then the grinding is fed along the Y direction, so that the first inclined surface and the second inclined surface can be machined. During the machining process, the roller continuously corrects the surface of the grinding wheel, thereby ensuring the grinding accuracy of the first inclined surface and the second inclined surface.

[0045] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0046] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A grinding method of a plurality of compound bevels, characterized by, The method comprises the following steps: S1. Positioning the intersection line of the first inclined surface and the second inclined surface; S2. Rotating the part so that the intersection line is parallel to the longitudinal axis; S3. Designing the outer shape of the grinding wheel according to the included angle θ of the first inclined surface and the second inclined surface, the included angle ∠1 of the first inclined surface and the horizontal axis, and the included angle ∠2 of the second inclined surface and the horizontal axis, so that the outer shape line of the grinding wheel has an included angle of θ; S4. Clamping the part, rotating the grinding wheel, and rotating the grinding wheel head around the longitudinal axis and feeding the grinding wheel along the longitudinal axis, and the rotation angle of the grinding wheel head is ∠1+π / 2-θ / 2; In step S2, the intersection line is projected onto the horizontal plane to obtain a projection line, the angle between the projection line and the horizontal axis is w, the angle between the projection line and the intersection line is γ, the part is rotated around the vertical axis by π / 2-w, at this time the projection line is parallel to the longitudinal axis, and then the part is rotated around the horizontal axis by γ, so that the intersection line is parallel to the longitudinal axis.

2. The grinding method of a plurality of compound bevels according to claim 1, wherein: In step S3, the grinding wheel is formed by roller grinding, the left profile line and the right profile line of the roller are designed according to the included angle θ of the first inclined surface and the second inclined surface, so that the included angle between the left profile line and the right profile line of the roller is θ, the included angle between the left profile line and the horizontal axis is ∠3, the included angle between the right profile line and the horizontal axis is ∠4, and ∠3=∠4.

3. The grinding method of a plurality of compound bevels according to claim 2, wherein: In step S4, the rotation angle of the grinding wheel head is ∠1+∠3.

4. The method of claim 1, wherein: In step S3, after the outer shape line of the grinding wheel is manufactured, it needs to be rounded.

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