Clamping fixture and machining method for combined machining of half-type outer ring of guide
Patent Information
- Application Number
- CN202611034640.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-13
- Publication Date
- 2026-11-03
AI Technical Summary
In the existing technology, the processing of the front and rear outer ring combination parts of the guide has the problems of high difficulty in process route design, high difficulty in part processing and easy deformation. In particular, since it is a half-and-half structure and the material is TC1 which is difficult to process and has thin wall thickness, it is easy to deform during processing.
A clamping fixture for machining the outer ring assembly of a split guide was designed, including a base plate, multiple pressure plate assemblies and positioning pins. The outer ring assembly of the guide is fixed by inverted support, and the rigidity is enhanced by the inner and outer clamping components to reduce clamping deformation. By using a reasonable process route and special fixtures, the clamping and alignment method of the parts is adjusted to ensure the accuracy of the machining datum and dimensional datum.
Stable clamping of the outer ring assembly of the half-type guide was achieved, reducing machining deformation, improving machining pass rate and efficiency, ensuring the accuracy and quality of the parts, and meeting the machining requirements of aero-engines.
Smart Images
Figure CN123025140A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aero-engine component guide machining technology, and in particular, to a clamping fixture for machining the outer ring assembly of a half-type guide. Furthermore, this invention also relates to a method for machining the outer ring assembly of a half-type guide using this clamping fixture. Background Technology
[0002] The guide vane front and rear outer ring assembly is a key component for the installation of guide vanes in turboprop engines. Its outer ring connects to the accessory drive housing, and its inner ring connects to the guide vanes. Unlike conventional one-piece parts and housing-split-half parts, the guide vane front and rear outer ring assembly is radially cut into two axial parts: the guide vane front outer ring and the guide vane rear outer ring, as shown in the attached diagram. Figure 1 and Figure 2 As shown, there is a ring of guide vane holes at the cut-off point between the two parts. The guide vane holes are divided into upper and lower halves, and the center of the holes is located on the mating surface of the two parts. It is a typical upper and lower half ring-shaped part, which has the common characteristics of ring-shaped parts and half-shaped parts. Its existing processing method has the following problems: 1. The process route design is very difficult: Aero-engine parts are usually machined individually and then assembled or assembled in half left and right. However, this part has an upper and lower half structure and cannot be machined using the conventional guide mechanism process. This is mainly because the front outer ring and the rear outer ring of the guide mechanism have common features and need to be machined together. In addition, the assembly surface of the part is the reference surface of the part and the machining accuracy requirements are high. At the same time, the holes and surfaces on the part have mutual positional relationships. Therefore, the rationality of the process route design directly affects the machining quality of the part. 2. The part is a thin-walled part that is difficult to machine and is prone to deformation during processing: The part is made of TC1, a difficult-to-machine material, with a minimum wall thickness of 3mm and a maximum diameter of φ480. It is a typical thin-walled part that is prone to deformation during processing. Furthermore, the outer circles and holes on the front and rear outer rings are all related to assembly, so the dimensional requirements are high and the processing is difficult to meet the standards. Summary of the Invention
[0003] This invention provides a clamping fixture and processing method for machining the outer ring of a half-type guide, in order to solve the technical problems of high difficulty in process route design, high difficulty in part machining, and easy deformation during machining in existing clamping and machining methods.
[0004] The technical solution adopted in this invention is as follows: A clamping fixture for machining and fixing a split-type guide outer ring assembly is provided. The split-type guide outer ring assembly includes a front outer ring and a rear outer ring. The surfaces of the front and rear outer rings are respectively provided with three positioning pin holes, multiple bolt holes, and multiple blade assembly holes. The axial middle section of the rear outer ring also forms a concave annular groove. The maximum outer diameters of the front and rear outer rings form a positioning outer diameter. The clamping fixture includes: a base plate for mounting support, multiple pressure plate assemblies, and three positioning pins. The base plate is used to provide axial upward reverse support for the split-type guide outer ring assembly, so that... The front outer ring of the guide is located below the rear outer ring of the guide; multiple pressure plate assemblies are evenly spaced along the circumference of the half-type guide outer ring assembly, and each pressure plate assembly includes an inner clamping component and an outer clamping component that are radially correspondingly disposed on the inner and outer sides of the half-type guide outer ring assembly. The inner clamping component and the outer clamping component are respectively supported and connected to the base plate, and the inner clamping component is used to press down the top of the rear outer ring of the guide, and the outer clamping component is used to press down the lower groove surface of the inner concave annular groove of the rear outer ring of the guide; three positioning pins are spaced along the circumference of the base plate and vertically supported and connected to the base plate, so as to be inserted into the three positioning combination pin holes of the half-type guide outer ring assembly one by one.
[0005] Furthermore, the inner and outer clamping components have the same structure. The inner clamping component includes a pull rod component, a support pin assembly, and a pressure plate. The pull rod component and the support pin assembly are respectively vertically arranged, and the bottom end of the pull rod component is fixed to the base plate, while the bottom end of the support pin assembly is supported on the base plate. The pressure plate is Z-shaped, and its lower horizontal plate passes through the upper ends of the pull rod component and the support pin assembly, so as to pull the lower horizontal plate downward through the pull rod component and support the lower horizontal plate through the support pin assembly, thereby causing the upper horizontal plate of the pressure plate to press downward against the top end of the outer ring of the guide.
[0006] Furthermore, the base plate has a through-hole for mounting the tie rod component and a recessed positioning groove for the support pin assembly. The tie rod component includes a bushing installed in the through-hole, a fastening screw for fixing the bushing to the base plate, a vertically arranged tie rod with its lower end mounted in the bushing via a semi-circular key, a washer and a pressing nut installed on the outer circle of the upper end of the tie rod. The support pin assembly includes a vertically arranged support pin with its lower end supported in the positioning groove and a support nut installed on the outer circle of the upper end of the support pin. The lower horizontal plate of the pressure plate passes through the upper ends of the support pin and the tie rod, and is supported on the support nut and subjected to the pressing force applied by the washer and the pressing nut.
[0007] Furthermore, a hollow ring-shaped positioning support ring protrudes upward from the center of the base plate, and the bottom end of the outer ring of the guide is supported on the positioning support ring; the base plate is also provided with several through-holes arranged in a regular manner to reduce the weight of the base plate.
[0008] Furthermore, the base plate is also machined with three locating pin holes that penetrate the plate surface, and the bottom ends of the three locating pins are respectively installed in the corresponding three locating pin holes; the center of the base plate is also machined with a locating center hole as a locating reference, the inner hole runout of the locating center hole is no greater than 0.01, and the three locating pin holes and the locating center hole meet the set size and tolerance requirements.
[0009] According to another aspect of the present invention, a method for machining the outer ring assembly of a split-type guide is also provided, using a clamping fixture for machining the outer ring assembly of a split-type guide as described above. The machining method includes the following steps: machining the outer dimensions, assembly surface, and end face of the front outer ring and the rear outer ring of the guide separately; machining three corresponding positioning pin holes on the front and rear outer rings of the guide after assembly; machining multiple bolt connection holes on the front and rear outer rings of the guide separately; inserting three positioning pins into the three positioning pin holes to position the front and rear outer rings of the guide, and clamping them in the clamping fixture for machining the outer ring assembly of the split-type guide; machining the inner flow channel surface, two positioning outer circles, and multiple blade assembly holes of the split-type guide outer ring assembly formed after positioning and assembly.
[0010] Furthermore, when the half-shaped guide outer ring assembly formed by the positioning combination is clamped and positioned in the clamping fixture, the three positioning combination pin holes on the half-shaped guide outer ring assembly are constrained to the three corresponding positioning pins on the clamping fixture. After the half-shaped guide outer ring assembly is installed in the clamping fixture, the positioning center hole reference of the clamping fixture is aligned to be no greater than 0.01, thereby aligning the center of the three positioning combination pin holes and ensuring that the position reference of the positioning pin holes coincides with the center of the three positioning combination pin holes.
[0011] Furthermore, the step "machining the inner flow channel surface, two positioning outer circles, and multiple blade assembly holes of the half-type guide outer ring assembly formed after machining and positioning" specifically includes the following steps: machining the inner flow channel surface of the half-type guide outer ring assembly; rough machining the two positioning outer circles and the outer circles at the blade assembly holes of the half-type guide outer ring assembly; rough machining the multiple blade assembly holes of the half-type guide outer ring assembly; finish machining the two positioning outer circles of the half-type guide outer ring assembly; and finish machining the multiple blade assembly holes of the half-type guide outer ring assembly.
[0012] Furthermore, the step "finish machining of the two positioning outer circles of the half-type guide outer ring assembly" specifically includes the following steps: before machining, align the positioning center hole of the clamping fixture so that the runout is no greater than 0.01 and the runout of the bottom end face of the guide's front outer ring is no greater than 0.02; before tightening, use a 0.02 feeler gauge to check whether there is a gap between the bottom end face of the guide's front outer ring and the upper surface of the positioning support ring. If there is a gap, fill it with the feeler gauge; check that the runout values of the four symmetrical points at the blade assembly hole on the guide's rear outer ring before and after the pressure plate is tightened should not differ by more than 0.02; after machining, disassemble the guide's front outer ring and rear outer ring, deburr them, and send them for inspection.
[0013] Furthermore, after completing the step "precision machining of the two positioning outer circles of the half-type guide outer ring assembly", and before performing the step "precision machining of multiple blade assembly holes of the half-type guide outer ring assembly", the steps also include: combining the positioning combination pin with the positioning combination pin hole and combining the bolt with the bolt connection hole by using precise tightening torque.
[0014] The present invention has the following beneficial effects: In the clamping fixture of this invention, the half-type guide outer ring assembly is inverted and fixed in the fixture, that is, the rear outer ring of the guide is located above the front outer ring of the guide. At the same time, multiple sets of pressure plate assemblies are evenly distributed along the circumference of the half-type guide outer ring assembly. Each set of pressure plate assemblies includes an inner clamping component and an outer clamping component arranged radially inward and outward. The inner clamping component is used to press down on the top end of the rear outer ring of the guide, and the outer clamping component is used to press down on the lower groove surface of the concave annular groove of the rear outer ring of the guide. Thus, on the one hand, the rigidity of the half-type guide outer ring assembly is strengthened by "inverting", reducing clamping deformation and solving the technical problem of easy deformation of the half-type guide outer ring assembly after processing. On the other hand, the entire clamping and fixing method is simple, stable and reliable, and can stably clamp the half-type guide outer ring assembly while avoiding its clamping deformation. In the processing method of this invention, although the initial step involves rough machining of the positioning outer circle of the part followed by machining of the positioning combination pin hole, the subsequent finishing machining of the two positioning outer circles uses the positioning combination pin hole for positioning. Therefore, the machining datum and dimensional datum errors are relatively small. At the same time, the mutual conversion of positioning datums reduces the accumulation of errors. Thus, the processing method of this invention, through the design of a reasonable process route, adjustment of the part clamping and alignment method, and design of a special fixture, has achieved the following results after processing and verification on multiple batches of parts: the processing of the half-type guide part of the aero-engine has been realized, and the part processing qualification rate is 90%, while the processing efficiency is also greatly improved.
[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description
[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the outer ring space structure in front of the guide; Figure 2 This is a schematic diagram of the outer ring space structure behind the guide; Figure 3 This is a top view of the outer ring structure of the guide. Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction; Figure 5 This is a top view of the outer ring structure of the guide. Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure along the CC direction; Figure 7 This is a process diagram for machining the three existing positioning combination pin holes; Figure 8 This is the existing machining process drawing for the outer circle of the positioning device; Figure 9 This is a top view of the clamping fixture of the present invention for clamping the outer ring of the half-type guide. Figure 10 yes Figure 9 A schematic diagram of the EE cross-sectional structure; Figure 11 yes Figure 9 Top view of the midsole plate; Figure 12 yes Figure 11 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 13 This is the machining process diagram for the outer ring of the guide in step S10; Figure 14 This is the machining process diagram of the outer ring of the guide in step S10; Figure 15 This is the machining process diagram for the three positioning combination pin holes in step S20; Figure 16 This is the machining process diagram for the outer ring of the guide in step S30; Figure 17 This is the machining process diagram for the outer ring of the guide in step S30; Figure 18 These are the machining process diagrams for the inner flow channel surface in step S501, the positioning outer circle in S502 and S504, and the outer circle at the blade assembly hole. Figure 19 These are the process diagrams for machining the blade assembly holes in steps S503 and S506. Figure 20 This is a schematic diagram of the inverted assembly of the outer ring of the half-type guide.
[0017] Legend: 1. Half-type guide outer ring assembly; 101. Assembly surface; 102. Positioning assembly pin hole; 103. Bolt connection hole; 104. Blade assembly hole; 105. Inner concave annular groove; 106. Positioning outer circle; 107. Inner flow channel surface; 11. Guide front outer ring; 12. Guide rear outer ring; 13. Positioning assembly pin; 2. Base plate; 201. Mounting through hole; 202. Positioning groove; 203. Positioning support ring; 205. Positioning center hole; 3. Positioning pin; 401. Tie rod assembly; 4011. Bushing; 4012. Fastening screw; 4013. Semicircular key; 4014. Tie rod; 4015. Press-down nut; 402. Support pin assembly; 4021. Support pin; 4022. Support nut; 403. Pressure plate. Detailed Implementation
[0018] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0019] Those skilled in the art will understand that, unless specifically stated otherwise, the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, and / or combinations thereof. It should be understood that when we say a component is "connected" to another component, it can be directly connected to the other component or connected via an intermediate component. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items. The terms "first" and "second," etc., in this specification and claims are used to distinguish different objects, not to describe a particular order.
[0020] Reference Figures 1-6 , Figures 9-10A preferred embodiment of the present invention provides a clamping fixture for machining a half-type guide outer ring assembly, used to clamp and fix the half-type guide outer ring assembly 1. The half-type guide outer ring assembly 1 includes a front guide outer ring 11 and a rear guide outer ring 12. Three positioning pin holes 102, multiple bolt connection holes 103, and multiple blade assembly holes 104 are correspondingly provided on the assembly surface 101 of the front guide outer ring 11 and the rear guide outer ring 12. The axial middle section of the rear guide outer ring 12 is also concave to form an inwardly recessed annular groove 105. The maximum outer diameters of the front guide outer ring 11 and the rear guide outer ring 12 form a positioning outer diameter 106. The clamping fixture includes: a base plate 2 for mounting support, multiple pressure plate assemblies, and three positioning pins 3; the base plate 2 is used for axial upward reverse support. The bi-half guide outer ring assembly 1 is supported so that the front outer ring 11 of the guide is located below the rear outer ring 12 of the guide; multiple sets of pressure plate assemblies are evenly spaced along the circumference of the bi-half guide outer ring assembly 1, and each pressure plate assembly includes an inner pressing component and an outer pressing component that are radially correspondingly disposed on the inner and outer sides of the bi-half guide outer ring assembly 1. The inner pressing component and the outer pressing component are respectively supported and connected to the base plate 2, and the inner pressing component is used to press down the top end of the rear outer ring 12 of the guide, and the outer pressing component is used to press down the lower groove surface of the inner concave annular groove 105 of the rear outer ring 12 of the guide; three positioning pins 3 are spaced along the circumference of the base plate 2 and vertically supported and connected to the base plate 2, so as to be inserted into the three positioning combination pin holes 102 of the bi-half guide outer ring assembly 1 one by one.
[0021] When the existing half-type guide outer ring assembly 1 is clamped and fixed using existing fixtures, the thinner-walled rear outer ring 12 of the guide is located below the relatively thicker-walled front outer ring 11 of the guide. The entire clamping and fixing method only involves the downward pressure on the top of the front outer ring 11 of the guide, and there is torque involved in the entire clamping and fixing method. Moreover, the thinnest part of the wall thickness of the rear outer ring 12 of the guide is only 3.2mm, so it is very easy to cause clamping and processing deformation. After measurement and processing, the positioning outer circle 106 has irregular elliptical deformation, with the maximum deformation being about 0.25 ellipse. This results in the two positioning outer circle diameter dimensions φ479.92 (0, -0.06) on the half-type guide outer ring assembly 1 being unqualified, which in turn indirectly affects the position accuracy of the bolt connection hole 103 and the blade assembly hole 104. In the clamping fixture of the present invention, the half-type guide outer ring assembly 1 is inverted and supported and fixed in the fixture, that is, the rear outer ring 12 of the guide is located above the front outer ring 11 of the guide. At the same time, multiple sets of pressure plate assemblies are evenly distributed along the circumference of the half-type guide outer ring assembly 1. Each set of pressure plate assemblies includes an inner clamping component and an outer clamping component arranged radially inward and outward respectively. The inner clamping component is used to press down on the top end of the rear outer ring 12 of the guide, and the outer clamping component is used to press down on the lower groove surface of the concave annular groove 105 of the rear outer ring 12 of the guide. Thus, on the one hand, the rigidity of the half-type guide outer ring assembly 1 is strengthened by "inverting", reducing clamping deformation and solving the technical problem of easy deformation of the half-type guide outer ring assembly 1 after processing. At the same time, the entire clamping and fixing method is simple, stable and reliable, which can stably clamp the half-type guide outer ring assembly 1 and avoid its clamping deformation.
[0022] Optionally, such as Figure 9 and Figure 10 As shown, the inner and outer clamping components have the same structure. The inner clamping component includes a pull rod component 401, a support pin group 402, and a pressure plate 403. The pull rod component 401 and the support pin group 402 are respectively vertically arranged, and the bottom end of the pull rod component 401 is fixed to the base plate 2, while the bottom end of the support pin group 402 is supported on the base plate 2. The pressure plate 403 is Z-shaped, and its lower horizontal plate passes through the upper ends of the pull rod component 401 and the support pin group 402 respectively, so as to pull the lower horizontal plate downward through the pull rod component 401 and support the lower horizontal plate through the support pin group 402, thereby causing the upper horizontal plate of the pressure plate 403 to press down on the top end of the outer ring 12 of the guide.
[0023] In this optional solution, such as Figures 10-12As shown, the base plate 2 has a through-hole 201 that penetrates the plate surface at the position corresponding to the tie rod component 401, and a recessed positioning groove 202 at the position corresponding to the support pin assembly 402; the tie rod component 401 includes a bushing 4011 installed in the through-hole 201, a fastening screw 4012 that fixes the bushing 4011 to the base plate 2, a vertically arranged tie rod 4014 installed in the bushing 4011 with its lower end passing through a semi-circular key 4013, and a tie rod 4014 installed on the tie rod The upper outer circle of 4014 has a washer and a pressing nut 4015. The support pin assembly 402 includes a vertically arranged support pin 4021 with its bottom end supported in the positioning groove 202, and a support nut 4022 installed on the upper outer circle of the support pin 4021. The lower horizontal plate of the pressure plate 403 passes through the upper ends of the support pin 4021 and the pull rod 4014, and is supported on the support nut 4022 and subjected to the downward pressing force applied by the washer and the pressing nut 4015. During operation, the pressure plate 403 is subjected to downward pressure by tightening the pressing nut 4015, and the pressure plate 403 is supported by adjusting the height position of the support nut 4022. In addition, the bushing 4011 and the semi-circular key 4013 prevent the pull rod 4014 from rotating, thereby improving the stability of the pressure plate 403 under pressure.
[0024] In this optional solution, such as Figures 10-12 As shown, a hollow ring-shaped positioning support ring 203 protrudes upward from the center of the base plate 2. The bottom end of the guide's outer ring 11 is supported on the positioning support ring 203, thereby reducing the contact area between the bottom end of the guide's outer ring 11 and the positioning support ring 203, so as to reduce the processing difficulty of the positioning support ring 203. The base plate 2 is also provided with several through holes arranged in a regular pattern to reduce the weight of the base plate 2.
[0025] In this optional solution, such as Figures 11-12 As shown, the base plate 2 is also machined with three positioning pin holes that penetrate the plate surface. The bottom ends of the three positioning pins 3 are respectively installed in the corresponding three positioning pin holes. The center of the base plate 2 is also machined with a positioning center hole 205 as a positioning reference. The inner hole runout of the positioning center hole 205 is no greater than 0.01. The three positioning pin holes and the positioning center hole 205 meet the set size and tolerance requirements in order to improve the subsequent clamping and positioning accuracy.
[0026] A preferred embodiment of the present invention also provides a method for machining the outer ring assembly 1 of a half-type guide, using a machining clamping fixture for machining the outer ring assembly of the half-type guide as described above, and the machining method includes the following steps: S10: Separately process the outer dimensions, assembly surface 101, and end face of the guide front outer ring 11 and guide rear outer ring 12; S20: The three corresponding positioning combination pin holes 102 of the guide front outer ring 11 and guide rear outer ring 12 after assembly; S30: Separately process the multiple bolt connection holes 103 corresponding to the front outer ring 11 and the rear outer ring 12 of the guide; S40: Three positioning combination pins 13 are inserted into three positioning combination pin holes 102 respectively to position the front outer ring 11 and the rear outer ring 12 of the combined guide, and clamped and positioned in the half-type guide outer ring combination machining clamping fixture. S50: The inner flow channel surface 107, two positioning outer circles 106, and multiple blade assembly holes 104 of the half-type guide outer ring assembly 1 formed after machining and positioning assembly.
[0027] On the one hand, in the processing method of the present invention, since the above-mentioned clamping fixture for processing the outer ring assembly of the half-type guide is used, when processing using the processing method of the present invention, the outer ring assembly of the half-type guide can be "inverted" using the fixture of the present invention, such as... Figure 20 As shown, this strengthens the rigidity of the half-type guide outer ring assembly 1, reduces clamping deformation, and the clamping and fixing method of the half-type guide outer ring assembly 1 is simple, stable, reliable, easy to clamp, and can stably clamp the half-type guide outer ring assembly 1 while avoiding its clamping deformation.
[0028] On the other hand, the outer circle 106 of the structural positioning part (referring to the half-type guide outer ring assembly 1) has a dimension of φ479.92 (0, -0.06) which is the assembly dimension for assembly with the casing, and is also the datum for the holes on the front outer ring 11 and rear outer ring 12 of the guide. These dimensions have a positional relationship and require high machining precision. Furthermore, since both the front outer ring 11 and the rear outer ring 12 of the guide have a dimension of φ479.92 (0, -0.06) that needs to be machined together, and the assembly of the front outer ring 11 and the rear outer ring 12 requires passing through holes, the holes must be machined first, i.e., the hole elements must be machined first, followed by the datum. This contradicts the conventional process of machining the datum first and then the hole elements, increasing machining errors and thus raising the process requirements. The existing process scheme for machining φ479.92 (0, -0.06) and the holes is as follows: First, machine the holes: Align the separated and rough-machined outer diameter G1 so that the runout is no greater than 0.02 mm. After fixing, align G2 so that the runout is no greater than 0.01 mm. Machine the positioning pin hole 102, as shown in the attached diagram. Figure 7 As shown; The outer diameter of the positioning circle 106 is further machined to a dimension of φ479.92 (0, -0.06): According to... Figure 8 The alignment of the inner circular surface of φC is shown to ensure that the runout of the four symmetrical points is no greater than 0.03. Figure 8 As can be seen from the clamping method, the actual part cannot be aligned due to interference from the clamping pressure plate. Therefore, an inner conical surface is used to replace φC. The inner circle size of φC is required to be φ450 (+0.2, 0), which has a large dimensional tolerance and a 0.2 gap, resulting in a large cumulative error.
[0029] Based on the analysis of the above processing steps and alignment methods, the following problems exist with the existing processing clamping methods: 1. The machining position of the outer circle 106 is the reference of the positioning combination pin hole 102. However, the positioning combination pin hole 102 was not used to determine the center during the subsequent finishing of the outer circle 106, which resulted in a large error between the machining reference and the dimensional position reference. 2. After the rough machining of the positioning outer circle of the previous alignment part, the positioning assembly pin hole 102 was machined. Subsequently, a new positioning center was replaced and the positioning outer circle 106 was precision machined. The positioning datum conversion caused the accumulation of errors.
[0030] In the processing method of this invention, although the positioning outer circle of the part is rough-machined first and then the positioning combination pin hole 102 is machined, the positioning combination pin hole 102 is used for positioning machining when the two positioning outer circles 106 are finished. Therefore, the machining datum and dimensional datum errors are small. At the same time, the mutual conversion of positioning datums reduces the accumulation of errors. Thus, the processing method of this invention, through the design of a reasonable process route, adjustment of the part clamping and alignment method and design of special fixtures, has achieved the following results after processing and verification of multiple batches of parts: the processing of the half-type guide part of the aero-engine is realized, and the part processing qualification rate is 100%. At the same time, the processing efficiency is also greatly improved.
[0031] Preferably, such as Figures 13-14 As shown, in step S10, since the blank is a cylindrical forging with a large amount of allowance, the outer dimensions of the front outer ring 11 and the rear outer ring 12 of the guide need to be rough-machined first to remove the allowance of the single piece, and then heat-treated to eliminate stress. Then, the assembly surface 101 and the end face are semi-finished to ensure that the accuracy of the assembly surface 101 and the end face (used as a reference for subsequent machining) meets the requirements, and to ensure that the subsequent assembly machining is qualified.
[0032] Preferably, such as Figure 15 As shown, during step S20, the positioning combination pin 13 is also machined simultaneously. Subsequent assembly dimension machining requires assembly using the positioning combination pin 13 before further assembly machining. Furthermore, the positioning combination pin hole 102 is relatively precise, allowing for accurate positioning of the front outer ring 11 and the rear outer ring 12 of the guide, ensuring coaxiality and their relative positional relationship.
[0033] Preferably, such as Figures 16-17As shown, since the bolt connection holes 103 on the front outer ring 11 and the rear outer ring 12 of the guide are located on the part assembly surface 101, the position of the bolt connection holes 103 is obscured after the parts are assembled, so they need to be processed separately. Furthermore, since step S20 simultaneously processes three positioning combination pin holes 102 on the front outer ring 11 and the rear outer ring 12 of the guide, the bolt connection holes 103 on the assembly surface 101 can all be aligned with the three positioning combination pin holes 102 for processing, thereby ensuring the relative positions of the bolt connection holes 103 on the front outer ring 11 and the rear outer ring 12 of the guide.
[0034] Preferably, in step S40, when the half-shaped guide outer ring assembly 1 formed by the positioning assembly is clamped and positioned in the clamping fixture, the three positioning combination pin holes 102 on the half-shaped guide outer ring assembly 1 are constrained to the three corresponding positioning pins 3 on the clamping fixture. After the half-shaped guide outer ring assembly 1 is installed in the clamping fixture, the datum of the positioning center hole 205 of the clamping fixture is aligned to be no greater than 0.01, thereby aligning the center of the three positioning combination pin holes 102 and ensuring that the position datum of the positioning pin holes coincides with the center of the three positioning combination pin holes 102. In step S40, after assembling the front outer ring 11 and the rear outer ring 12 of the guide through the three positioning combination pins 13, the assembly dimensions are machined. Since the positioning combination pin holes 102 are more precise than the bolt connection holes 103 and can better ensure the machining accuracy of the parts, the positioning combination pin holes 102 are selected for assembly.
[0035] Preferably, such as Figures 18-19 As shown, step S50 specifically includes the following steps: S501: Machining the inner flow channel surface 107 of the outer ring assembly 1 of the half-type guide; S502: Rough machining of the outer circles 106 at the two positioning points and the outer circles at the blade assembly holes 104 of the half-type guide outer ring assembly 1; S503: Rough machining of multiple blade assembly holes 104 in the outer ring assembly 1 of the half-type guide; S504: Finish machining of the two positioning outer circles 106 of the half-type guide outer ring assembly 1; S506: Finish machining of multiple blade assembly holes 104 in the outer ring assembly 1 of the half-type guide.
[0036] In step S50, after assembly, the inner flow channel surface 107, the two positioning outer circles 106, and the outer circles of the blade assembly holes 104 are rough-machined first. This is because the inner flow channel is mainly used for ventilation, so the tolerance is relatively large, and it can be machined into place first. The positioning outer circles 106 play an assembly role. There is machining deformation when machining the blade assembly holes 104 later, so rough machining is performed first. Then, the multiple blade assembly holes 104 are rough-machined. This is because the milling force is large when machining the holes, and there is deformation during machining. Rough and finish machining are required to ensure that the quality is qualified. Therefore, they need to be machined after the inner flow channel surface 107 and the positioning outer circles 106. Since the holes are through holes, the machining is discontinuous after completion. Cutting, intermittent cutting with excessive cutting force; then finish machining the two positioning outer circles 106 that mate with the accessory transmission housing to ensure that all bolt connection holes 103 are qualified. Also, because the maximum outer circle of the upper and lower end faces of the half-type guide outer ring assembly 1 is the reference for the blade assembly hole 104 of the guide blade, the final state must be ensured before the finish machining of the 23 blade assembly holes 104, so as to ensure the dimensional accuracy of the blade assembly holes 104; finally, finish machining the 23 blade assembly holes 104 to ensure that the blade assembly is qualified. This is because the reference for the blade assembly hole 104 is the positioning outer circle 106, so the reference must be the final state before finish machining the blade assembly hole 104.
[0037] Preferably, step S504 specifically includes the following steps: Before machining, align the clamping fixture and ensure the runout of the positioning center hole 205 is no greater than 0.01 mm and the runout of the bottom end face of the guide outer ring 11 is no greater than 0.02 mm. Before tightening, use a 0.02 feeler gauge to check whether there is a gap between the bottom end face of the outer ring 11 of the guide and the upper surface of the positioning support ring 203. If there is a gap, fill it with a feeler gauge. After checking the guide, the symmetrical runout values of the four points at the blade assembly hole 104 on the outer ring 12 of the guide should not differ by more than 0.02 before and after the pressure plate 403 is tightened. After processing, the front outer ring 11 and the rear outer ring 12 of the guide are disassembled, deburred, and then sent for inspection.
[0038] Preferably, after completing step S504 and before proceeding to step S506, step S505 is further included: By precisely tightening the torque, the positioning combination pin 13 is combined with the positioning combination pin hole 102, and the bolt is combined with the bolt connection hole 103, thereby simulating the assembly state of the parts, ensuring that the processing state is consistent with the assembly state, and thus ensuring that the processing is qualified.
[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A clamping fixture for machining a half-type guide outer ring assembly, used for clamping and fixing a half-type guide outer ring assembly (1), the half-type guide outer ring assembly (1) including a guide front outer ring (11) and a guide rear outer ring (12), the guide front outer ring (11) and the guide rear outer ring (12) are respectively provided with three positioning combination pin holes (102), multiple bolt connection holes (103) and multiple blade assembly holes (104) on the combination surface (101) of the guide front outer ring (11) and the guide rear outer ring (12), the axial middle section of the guide rear outer ring (12) is also concave to form a concave annular groove (105), the maximum outer circles of the guide front outer ring (11) and the guide rear outer ring (12) form a positioning outer circle (106), characterized in that, The clamping fixture includes: The base plate (2) which serves as the installation support, multiple pressure plate assemblies and three positioning pins (3); The base plate (2) is used to support the half-type guide outer ring assembly (1) in the axial upward direction so that the front outer ring (11) of the guide is located below the rear outer ring (12) of the guide; Multiple pressure plate assemblies are evenly spaced along the circumference of the half-type guide outer ring assembly (1), and each pressure plate assembly includes an inner pressing component and an outer pressing component that are radially respectively disposed on the inner and outer sides of the half-type guide outer ring assembly (1). The inner pressing component and the outer pressing component are respectively supported and connected on the base plate (2). The inner pressing component is used to press down the top of the guide rear outer ring (12), and the outer pressing component is used to press down the lower groove surface of the inner concave annular groove (105) of the guide rear outer ring (12). Three positioning pins (3) are circumferentially spaced and vertically supported on the base plate (2) for insertion into the three positioning combination pin holes (102) of the half-type guide outer ring assembly (1).
2. The clamping fixture for machining the outer ring assembly of the split guide as described in claim 1, characterized in that, The inner clamping assembly and the outer clamping assembly have the same structure. The inner clamping assembly includes a pull rod component (401), a support pin group (402), and a pressure plate (403). The tie rod component (401) and the support pin assembly (402) are respectively vertically arranged, and the bottom end of the tie rod component (401) is fixed to the base plate (2), while the bottom end of the support pin assembly (402) is supported on the base plate (2); The pressure plate (403) is Z-shaped, and the lower horizontal plate is respectively inserted through the upper ends of the pull rod component (401) and the support nail group (402) so that the lower horizontal plate is pulled down by the pull rod component (401) and supported by the support nail group (402), thereby causing the upper horizontal plate of the pressure plate (403) to press down on the top end of the outer ring (12) of the guide.
3. The clamping fixture for machining the outer ring assembly of the split guide as described in claim 2, characterized in that, The base plate (2) has a through hole (201) that penetrates the plate surface at the corresponding tie rod component (401), and a recessed positioning groove (202) at the corresponding support nail group (402). The tie rod assembly (401) includes a bushing (4011) installed in the mounting through hole (201), a fastening screw (4012) that fixes the bushing (4011) to the base plate (2), a tie rod (4014) that is vertically arranged and installed in the bushing (4011) through a semi-circular key (4013) at its lower end, a washer and a pressing nut (4015) installed on the outer circle of the upper end of the tie rod (4014), and a support pin assembly (402) including a support pin (4021) that is vertically arranged and supported at its lower end in the positioning groove (202), and a support nut (4022) installed on the outer circle of the upper end of the support pin (4021). The lower horizontal plate of the pressure plate (403) is provided with the upper end of the support nail (4021) and the tie rod (4014), and is supported on the support nut (4022) and subjected to the downward pressure force applied by the washer and the lower pressure nut (4015).
4. The clamping fixture for machining the outer ring assembly of the half-type guide as described in claim 1, characterized in that, A hollow ring-shaped positioning support ring (203) protrudes upward from the center of the base plate (2), and the bottom end of the outer ring (11) of the guide is supported on the positioning support ring (203); The base plate (2) is also provided with several through holes arranged in a regular pattern to reduce the weight of the base plate (2).
5. The clamping fixture for machining the outer ring assembly of the split guide as described in claim 1, characterized in that, The base plate (2) is also machined with three positioning pin holes that penetrate the plate surface. The bottom ends of the three positioning pins (3) are respectively installed in the corresponding three positioning pin holes. The center of the base plate (2) is also machined with a positioning center hole (205) as a positioning reference. The inner hole runout of the positioning center hole (205) is no greater than 0.01, and the three positioning pin holes and the positioning center hole (205) meet the set size and tolerance requirements.
6. A method for assembling and machining the outer ring of a split-type guide, characterized in that, The machining method using the half-type guide outer ring assembly machining clamping fixture as described in any one of claims 1-5 includes the following steps: Separately process the outer dimensions, assembly surface (101), and end face of the front outer ring (11) and rear outer ring (12) of the guide; After assembly, the three corresponding positioning combination pin holes (102) of the front outer ring (11) and rear outer ring (12) of the guide are machined. Separately process the multiple bolt connection holes (103) corresponding to the front outer ring (11) and the rear outer ring (12) of the guide. Three positioning combination pins (13) are inserted into three positioning combination pin holes (102) respectively to position the front outer ring (11) and rear outer ring (12) of the combined guide, and clamped and positioned in the half-type guide outer ring combination machining clamping fixture; The inner flow channel surface (107), two positioning outer circles (106), and multiple blade assembly holes (104) of the half-type guide outer ring assembly (1) formed after machining and positioning assembly.
7. The processing method of the outer ring assembly (1) of the half-type guide according to claim 6, characterized in that, When the half-type guide outer ring assembly (1) formed by the positioning assembly is clamped and positioned in the clamping fixture, the three positioning combination pin holes (102) on the half-type guide outer ring assembly (1) and the corresponding three positioning pins (3) on the clamping fixture are constrained together. After the half-type guide outer ring assembly (1) is installed in the clamping fixture, the reference of the positioning center hole (205) of the clamping fixture is aligned with no more than 0.01, thereby aligning the center of the three positioning combination pin holes (102) and ensuring that the position reference of the positioning pin hole coincides with the center of the three positioning combination pin holes (102).
8. The processing method of the outer ring assembly (1) of the half-type guide according to claim 6, characterized in that, The step "processing the inner flow channel surface (107), two positioning outer circles (106), and multiple blade assembly holes (104) of the half-type guide outer ring assembly (1) formed after machining and positioning" specifically includes the following steps: Machining the inner flow channel surface (107) of the outer ring assembly (1) of the half-type guide. Roughly machine the outer circles of the two positioning outer circles (106) and the outer circles of the blade assembly hole (104) of the half-type guide outer ring assembly (1); Roughly machine the multiple blade assembly holes (104) of the half-type guide outer ring assembly (1). The two positioning outer circles (106) of the half-type guide outer ring assembly (1) are precision machined. The multiple blade assembly holes (104) of the half-type guide outer ring assembly (1) are precision machined.
9. The processing method of the outer ring assembly (1) of the half-type guide according to claim 8, characterized in that, The step "finish machining of the two positioning outer circles (106) of the half-type guide outer ring assembly (1)" specifically includes the following steps: Before machining, align the clamping fixture and ensure that the runout of the positioning center hole (205) is no greater than 0.01 and the runout of the bottom end face of the outer ring (11) of the guide is no greater than 0.
02. Before tightening, use a 0.02 feeler gauge to check whether there is a gap between the bottom surface of the outer ring (11) of the guide and the upper surface of the positioning support ring (203). If there is a gap, fill it with a feeler gauge. The symmetrical runout values of the outer circle at the blade assembly hole (104) on the outer ring (12) of the guide after the pressure plate (403) are checked and the difference between the four points should not be greater than 0.
02. After processing, the front outer ring (11) and rear outer ring (12) of the guide are disassembled, deburred, and sent for inspection.
10. The processing method of the outer ring assembly (1) of the half-type guide according to claim 8, characterized in that, After completing the step "finish machining the two positioning outer circles (106) of the half-type guide outer ring assembly (1)," and before performing the step "finish machining the multiple blade assembly holes (104) of the half-type guide outer ring assembly (1)," the following step is also included: The positioning combination pin (13) is combined with the positioning combination pin hole (102) by precise tightening torque, and the bolt is combined with the bolt connection hole (103).