Chock reference conversion method

Abstract

The application discloses a bearing seat reference conversion method, before machining a blank, according to the selection requirement of the axial reference given by the oil channel end face in the cavity and the mounting seat center, according to the selection requirement of the radial reference given by the outer circle and the inner hole, according to the selection requirement of the angular reference given by the oil channel, the axial, radial and angular references meeting the requirement are selected on the blank; in the machining process, the conversion requirement of the axial, radial and angular references in the blank reference is given, so as to judge whether the selected axial, radial and angular references meet the reference conversion requirement, if the requirement is met, the blank reference is converted into the machining reference; the scheme standardizes the selection and conversion of the blank reference, compared with the prior art, solves the problems of the deviation of the mounting seat center, the penetration of the oil channel end face hole machining, the overcut or no allowance machining and the misplacement of the oil channel butt joint, improves the qualified rate of the bearing seat machining, has strong practicability and is suitable for being widely promoted and applied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing seat processing, in particular, to a bearing seat reference conversion method. BACKGROUND

[0002] As an important supporting component of the engine rotor system, the bearing seat has high function integration, complex internal oil circuit and compact structure, therefore, how to improve the machining qualification rate of the bearing seat part is the key in the manufacturing process. At present, the reference conversion scheme of the bearing seat is that the axial, radial and angular references of the blank are marked according to the given reference of the design, and the reference conversion is carried out according to the conventional part machining in the machining process. Firstly, the axial reference is aligned with the marked part of the blank, and is converted to the current machining end face; secondly, the radial reference is aligned with the marked part of the blank, and is converted to the current machining outer circle or inner hole; thirdly, the angular reference is aligned with the marked part of the blank, and is converted to the hole on the current machining surface.

[0003] However, the above reference conversion scheme has the following problems in actual machining:

[0004] 1) In the axial reference conversion, the center of the installation seat outside the bearing seat cavity is easy to deviate to a certain axial direction, and the oil circuit end face hole is easy to penetrate into the oil cavity;

[0005] 2) In the radial reference conversion, the outer circle and the inner hole of the bearing seat are easy to appear overcut or no allowance machining, so that the minimum wall thickness size of the bearing seat cannot be guaranteed, and the "vase" type bearing seat is the most typical size end coaxiality difference part, which is most prone to the above problems;

[0006] 3) In the angular reference conversion, the oil circuit butt joint hole is easy to be misaligned. SUMMARY

[0007] The present application provides a bearing seat reference conversion method to solve the technical problems of the existing bearing seat in the reference conversion, such as the deviation of the installation seat hole center, the penetration of machining, the overcut or no allowance machining and the misalignment of the oil circuit butt joint hole.

[0008] According to one aspect of the present application, a bearing seat reference conversion method is provided, comprising the following steps: S1, before machining the blank, according to the selection requirements of the axial reference given by the oil circuit end face in the cavity and the center of the installation seat, according to the selection requirements of the radial reference given by the outer circle and the inner hole of the blank, and according to the selection requirements of the angular reference given by the oil circuit, the axial, radial and angular references that meet the requirements are selected on the blank; S2, in the machining process, the conversion requirements of the axial, radial and angular references in the blank reference are given to judge whether the selected axial, radial and angular references meet the reference conversion requirements, and if the requirements are met, the blank reference is converted into the machining reference.

[0009] As a further improvement of the above technical solution:

[0010] Further, in step S1, the selection of the axial reference requires that the axial reference is located at the non-machining surface or the oil passage end surface in the cavity, and the left-right deviation of the center of the mounting seat is ≤0.4mm.

[0011] Further, in step S2, the conversion of the axial reference requires that the axial reference surface jump is ≤0.2mm, and the left-right deviation of the center of the mounting seat is ≤0.2mm.

[0012] Further, in step S2, when the bearing seat is a "flower vase" type bearing seat, the conversion of the axial reference requires that the axial reference surface jump is ≤0.2mm, the left-right deviation of the center of the mounting seat is ≤0.2mm, and the coaxiality of the large end and the small end of the bearing seat is ≤0.2mm.

[0013] Further, in step S1, the selection of the radial reference requires that the radial reference is located at the blank outer circle or inner hole with good rigidity at the non-machining surface.

[0014] Further, in step S2, the conversion of the radial reference requires that the radial reference symmetric four-point jump is ≤0.1mm.

[0015] Further, in step S1, when the bearing seat has an internal oil cavity, the selection of the radial reference requires that the radial reference is located at the blank outer circle or inner hole with good rigidity at the non-machining surface, and the coaxiality of the circular part where the internal oil cavity is located and the radial reference is ≤0.2mm.

[0016] Further, in step S1, when the bearing seat is a "flower vase" type bearing seat, the selection of the radial reference requires that the radial reference is located at the blank outer circle or inner hole with good rigidity at the non-machining surface, and the coaxiality of the large end and the small end of the bearing seat is ≤0.2mm.

[0017] Further, in step S1, the selection of the angular reference requires that the angular reference is located at the oil passage bottom hole, and the position degree of the angular reference is ≤0.2mm.

[0018] Further, in step S3, the conversion of the angular reference requires that the angular reference symmetric four-point jump is ≤0.08mm.

[0019] The present application has the following beneficial effects:

[0020] The bearing seat reference conversion method of the application selects the axial, radial and angular references on the blank according to the selection requirements of the axial reference given by the oil passage end face in the cavity and the mounting seat center, the selection requirements of the radial reference given by the outer circle and the inner hole, and the selection requirements of the angular reference given by the oil passage, before the blank machining; in the machining process, the conversion requirements of the axial, radial and angular references in the blank reference are given to judge whether the selected axial, radial and angular references meet the reference conversion requirements, and if the requirements are met, the blank reference is converted into the machining reference; the selection and conversion of the axial reference of the blank are standardized, and the oil passage end face in the cavity and the mounting seat center are associated with the axial reference, so that the mounting seat center deviation and the oil passage end face hole machining penetration are avoided; the selection and conversion of the radial reference of the blank are standardized, and the outer circle and the inner hole are associated with the radial reference, so that the overcut or no margin machining of the outer circle and the inner hole of the bearing seat is avoided, thereby ensuring the minimum wall thickness; the selection and conversion of the angular reference of the blank are standardized, and the angular reference and the oil passage are associated, so as to ensure the accurate oil passage docking; the selection and conversion of the blank reference are standardized and associated with the parts that may have problems, so as to realize the accurate and reliable control of the parts, compared with the prior art, the problems of mounting seat center deviation, oil passage end face hole machining penetration, overcut or no margin machining and oil passage docking misplacement are solved, the bearing seat machining qualification rate is improved, the practicality is strong, and the application is suitable for wide promotion and application.

[0021] In addition to the objects, features and advantages described above, the application has other objects, features and advantages. The application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate embodiments of the application and assist in explaining the application. In the drawings:

[0023] Figure 1 is a step block diagram of the bearing seat reference conversion method of the preferred embodiment of the application;

[0024] Figure 2 is a structural schematic diagram of a bearing seat of a certain typical structure. DETAILED DESCRIPTION

[0025] The embodiments of the application will be described in detail below with reference to the drawings, but the application can be implemented in various different ways limited and covered by the following description.

[0026] As Figure 1 and Figure 2The bearing seat reference conversion method of the embodiment includes the following steps: S1, before machining the blank, according to the selection requirement of the axial reference given by the oil passage end face in the cavity and the mounting seat center, according to the selection requirement of the radial reference given by the outer circle and the inner hole, and according to the selection requirement of the angular reference given by the oil passage, the required axial, radial and angular references are selected on the blank; S2, in the machining process, the conversion requirement of the axial, radial and angular references in the blank reference is given to determine whether the selected axial, radial and angular references meet the reference conversion requirement, and if the requirement is met, the blank reference is converted into the machining reference.

[0027] Specifically, the bearing seat reference conversion method of the embodiment includes the following steps: before machining the blank, according to the selection requirement of the axial reference given by the oil passage end face in the cavity and the mounting seat center, according to the selection requirement of the radial reference given by the outer circle and the inner hole, and according to the selection requirement of the angular reference given by the oil passage, the required axial, radial and angular references are selected on the blank; in the machining process, the conversion requirement of the axial, radial and angular references in the blank reference is given to determine whether the selected axial, radial and angular references meet the reference conversion requirement, and if the requirement is met, the blank reference is converted into the machining reference; by standardizing the selection and conversion of the axial reference of the blank and correlating the oil passage end face in the cavity and the mounting seat center with the axial reference, the mounting seat center deviation and the oil passage end face hole machining penetration are avoided; by standardizing the selection and conversion of the radial reference of the blank and correlating the outer circle and the inner hole with the radial reference, the overcut or no allowance machining of the outer circle and the inner hole of the bearing seat is avoided, thereby ensuring the minimum wall thickness; by standardizing the selection and conversion of the angular reference of the blank and correlating the angular reference with the oil passage, the oil passage docking accuracy is ensured; the present scheme standardizes the selection and conversion of the blank reference and correlates the selection and conversion of the reference with the parts that may have problems to achieve accurate and reliable control of the parts, solves the problems of mounting seat center deviation, oil passage end face hole machining penetration, overcut or no allowance machining and oil passage docking misplacement, improves the qualification rate of bearing seat machining, has strong practicality, and is suitable for wide promotion and application.

[0028] In the embodiment, in step S1, the selection requirement of the axial reference is that the axial reference is defined on the oil passage end face in the cavity, and the left-right deviation of the mounting seat center is ≤0.4mm.

[0029] Specifically, by defining the axial reference on the oil passage end face in the cavity, the axial position and the machining allowance of the oil passage end face in the cavity can be accurately controlled, so that when the oil passage end face hole is machined, the axial reference deviation is less than the thickness from the hole bottom to the oil passage, and thus the machining penetration phenomenon is avoided. Then, the left-right deviation of the mounting seat center is ≤0.4mm, so that after the conversion of the axial reference, the position of the mounting seat center is qualified, thereby ensuring the qualification of the mounting seat position machining.

[0030] Optionally, with the axial reference as the reference, a line is drawn at the mounting seat to check the left and right deviation of the mounting seat center, and when the deviation is greater than 0.4 mm, the blank needs to be remedied.

[0031] It should be understood that the deviation of the axial reference will cause the deviation of the axis of the part, thereby affecting the related dimensions of the outer circle and the inner hole of the part, and therefore, ensuring a good axial reference is the prerequisite for processing.

[0032] In this embodiment, in step S2, the conversion requirement of the axial reference is that the axial reference surface runout is found to be ≤0.2 mm, and the left and right deviation of the mounting seat center is ≤0.2 mm.

[0033] Specifically, when the axial reference surface runout is found to be ≤0.2 mm, and the left and right deviation of the mounting seat center is ≤0.2 mm, the processing quality of the part after the conversion of the axial reference meets the requirements; if the axial reference surface runout is greater than 0.2 mm, the deviation of the axis of the part is uncontrollable, thereby causing the uneven axial dimension allowance of the outer circle, the inner hole and the size end of the part.

[0034] Optionally, if the left and right deviation of the mounting seat center is >0.2 mm, the axial reference needs to be re-found, and if the axial reference is correct, the blank is fed back for axial reference checking and correction. If it cannot be corrected, the axial difference from the mounting seat center to the axial reference is measured, compared with the design theoretical value, adjusted and processed according to the difference, and three basically uniformly distributed mounting seat centers are selected as the reference surface to find and process.

[0035] In this embodiment, in step S2, when the bearing seat is a "flower vase" type bearing seat, the conversion requirement of the axial reference is that the axial reference surface runout is found to be ≤0.2 mm, the left and right deviation of the mounting seat center is ≤0.2 mm, and the coaxiality of the size end of the bearing seat is ≤0.2 mm.

[0036] Specifically, when the axial reference surface runout is found to be ≤0.2 mm, the left and right deviation of the mounting seat center is ≤0.2 mm, and the coaxiality of the size end of the bearing seat is ≤0.2 mm, the processing quality of the part after the conversion of the axial reference meets the requirements; when the coaxiality of the size end of the bearing seat is greater than 0.2 mm, the inner hole and the outer circle of the part will appear large area overcut or no allowance processing after the conversion of the reference.

[0037] It should be understood that the main feature of the "flower vase" type bearing seat is that the size end diameter difference is large, and there is no excessive section in the middle, which is a sudden change type of diameter enlargement or reduction. In the blank manufacturing process, part of the "flower vase" type bearing seat blank is spliced type, that is, a small diameter barrel and a large diameter barrel are spliced into a "flower vase" type bearing seat, and the coaxiality of the size end is difficult.

[0038] In this embodiment, in step S1, the selection of the radial reference requires that the radial reference is located at the non-machining surface and the rigid blank outer circle or inner hole.

[0039] Specifically, by locating the radial reference at the non-machining surface and the rigid blank outer circle or inner hole, the positional accuracy between the blank outer circle or inner hole and the machining surface is ensured, thereby avoiding overcutting or no margin machining of the part outer circle or inner hole during machining, and ensuring the minimum wall thickness.

[0040] In this embodiment, in step S2, the conversion of the radial reference requires that the symmetry four-point runout of the radial reference is ≤0.1mm. Specifically, during the conversion of the radial reference, by adjusting the symmetry four-point runout of the radial reference to ≤0.1mm, the accuracy after the conversion of the radial reference is ensured, the machining precision is guaranteed, the machining efficiency is improved, and the stability of the part is enhanced.

[0041] In this embodiment, in step S1, when the bearing seat has an internal oil cavity, the selection of the radial reference requires that the radial reference is located at the non-machining surface and the rigid blank outer circle or inner hole, and the coaxiality between the part circle where the internal oil cavity is located and the radial reference is ≤0.2mm.

[0042] Specifically, when selecting the radial reference, by ensuring that the coaxiality between the part circle where the internal oil cavity is located and the radial reference is ≤0.2mm, the internal oil cavity can be prevented from being machined through.

[0043] Alternatively, when the bearing seat has an internal oil cavity, the conversion of the radial reference requires that the symmetry four-point runout of the radial reference is ≤0.1mm, and the symmetry four-point runout of the part circle where the internal oil cavity is located is ≤0.2mm. If the symmetry four-point runout value of the part circle where the internal oil cavity is located is unqualified, the two runout values need to be homogenized to prevent the oil cavity from being machined through.

[0044] In this embodiment, in step S1, when the bearing seat is a "flower vase" type bearing seat, the selection of the radial reference requires that the radial reference is located at the non-machining surface and the rigid blank outer circle or inner hole, and the coaxiality between the large and small ends of the bearing seat is ≤0.2mm. Specifically, when selecting the radial reference, the coaxiality between the large and small ends of the bearing seat is ensured to be ≤0.2mm, so as to avoid overcutting or no margin machining of the outer circle and the inner hole.

[0045] In this embodiment, in step S1, the selection of the angular reference requires that the angular reference is located at the oil passage bottom hole, and the position degree of the angular reference is ≤0.2mm. Specifically, when the angular reference is located at the oil passage bottom hole and the position degree of the angular reference is ≤0.2mm, the oil passage can be accurately connected, and the problem of oil passage misalignment can be avoided.

[0046] In this embodiment, in step S3, the conversion requirement of the angular reference is that the symmetry four-point runout of the angular reference is less than or equal to 0.08 mm.

[0047] Specifically, in the angular reference conversion, the symmetry four-point runout of the angular reference is less than or equal to 0.08 mm, so as to ensure the accuracy after the angular reference conversion, guarantee the machining precision, improve the machining efficiency, and enhance the stability of the part.

[0048] Optionally, when the angular reference is converted to the end face design requirement angular hole, the position degree requirement of 0.03 mm is proposed for the blank angular reference and the machining angular reference, so as to ensure the accuracy after the angular reference conversion.

[0049] As shown in Figure 2 , the specific steps of the bearing seat reference conversion method of a certain bearing seat in this embodiment are as follows:

[0050] The axial reference is selected on the internal oil cavity end face, the radial reference is selected on the small end outer circle blank face, the angular reference is selected at the oil way bottom hole, and the blank scribe is at the center position of the mounting seat;

[0051] The axial reference surface runout is less than or equal to 0.2 mm;

[0052] The scribe deviation (left and right swing) is less than or equal to 0.2 mm, and whether the axial position of the mounting seat is correct is confirmed;

[0053] The radial reference symmetry four-point runout is less than or equal to 0.1 mm;

[0054] The bearing seat large end part round runout is less than or equal to 0.2 mm, and the coaxial degree of the part with the axial reference is less than or equal to 0.2 mm;

[0055] The internal oil cavity part round symmetry four-point runout is less than or equal to 0.2 mm;

[0056] The angular reference symmetry four-point runout is less than or equal to 0.08 mm;

[0057] In the angular reference conversion, the machining angular reference needs to propose a position degree requirement of 0.03 mm for the blank angular reference;

[0058] Start machining, use the center drill to pre-machining 1 mm deep drill pit in each mounting seat, so as to determine whether the positions of the mounting seats are correct.

[0059] As shown in Figure 2 , the bearing seat of the typical structure includes a mounting seat, an oil way, and an internal oil cavity.

[0060] It should be understood that, in Figure 2 , the references not specially marked are blank references.

[0061] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A method of chock reference transfer, characterized by, It comprises the following steps: S1, before machining the blank, according to the selection requirements of the axial reference of the oil passage end face in the cavity and the center of the mounting seat, according to the selection requirements of the radial reference of the outer circle and the inner hole of the blank, according to the selection requirements of the angular reference of the oil passage, the axial, radial and angular references meeting the requirements are selected on the blank; S2, in the machining process, the conversion requirements of the axial, radial and angular references in the blank reference are given to judge whether the selected axial, radial and angular references meet the reference conversion requirements, if they meet the requirements, the blank reference is converted into the machining reference; In step S1, the selection requirements of the axial reference are: The axial reference is determined on the non-machining surface or the oil passage end face in the cavity, and the left and right deflection amount of the mounting seat center is ≤0.4mm; In step S2, when the bearing seat is a "flower vase" type bearing seat, the conversion requirements of the axial reference are: The axial reference surface runout is ≤0.2mm, the left and right deflection amount of the mounting seat center is ≤0.2mm, and the coaxiality of the large and small ends of the bearing seat is ≤0.2mm; In step S2, the conversion requirements of the radial reference are: The symmetric four-point runout of the radial reference is ≤0.1mm; In step S1, when the bearing seat is a "flower vase" type bearing seat, the selection requirements of the radial reference are: The radial reference is determined on the non-machining surface and the outer circle or the inner hole of the blank with good rigidity, and the coaxiality of the large and small ends of the bearing seat is ≤0.2mm; In step S1, the selection requirements of the angular reference are: The angular reference is determined on the oil passage bottom hole, and the position degree of the angular reference is ≤0.2mm; In step S3, the conversion requirements of the angular reference are: The symmetric four-point runout of the angular reference is ≤0.08mm.

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