A method for intermittent turning of an elastic bearing housing

Abstract

The present invention provides a method for intermittent turning of an elastic bearing housing, comprising the following specific steps: S1, manufacturing a process welding insert based on the width of the interval between adjacent lower elastic lugs and the thickness of the lower elastic lugs; S2, placing the process welding insert in the interval between adjacent lower elastic lugs and welding the process welding insert to the upper and lower end surfaces of the lower elastic lugs; S3, filling the welded process welding insert and the lower elastic lug with a paste of tooth base powder, and allowing the paste of tooth base powder to solidify; S4, performing upper and lower symmetrical rough turning, semi-finishing turning, and finishing on the lower elastic lugs of S3, removing the process welding insert, the paste of tooth base powder, and the machining allowance to obtain the elastic bearing housing after intermittent turning. The method of the present invention is simple to operate, can avoid the use of complex tooling, and can effectively solve the problem of intermittent cutting of elastic bearing housings.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular to an intermittent turning method for a gas turbine elastic bearing housing. Background Art

[0002] Bearing housing (such as Figure 1 The part shown in the figure is a key component in a gas turbine power turbine. It features two layers of elastic, fan-shaped lugs, requiring lathing of both the end faces and the outer diameter. Several difficulties arise during machining: First, the turning process involves intermittent cutting, which can easily lead to tool wear and chipping. Second, the lugs are overhanging elastic structures, resulting in poor rigidity in the machining area and prone to vibration, leading to severe tool chatter and tool deflection. Third, strict dimensional accuracy requirements exist, with end runout of 0.02, round runout of 0.03, and an outer diameter tolerance of 0.056. Intermittent turning is difficult to achieve given the poor rigidity and vibration-prone machining area.

[0003] In the early stages of the machining process, direct intermittent turning was performed, resulting in vibration, tool breakage, poor roughness, and low machining efficiency. Subsequent approaches included inserting an interference fit of wood between the two sector-shaped lugs, welding fixed tie rods to the upper and lower ends of the elastic lugs, and wrapping extensive rubber tubing around the receiver body and the elastic lugs. While these approaches achieved some results, they did not completely resolve the associated issues. Intermittent cutting of elastic bearing housings has always been a difficult problem in machining. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a method for intermittent turning of a gas turbine elastic bearing housing, which is easy to operate, can avoid the use of complex tooling, and can effectively solve the problem of intermittent cutting of the elastic bearing housing.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for intermittent turning of an elastic bearing housing, comprising the following specific steps:

[0006] S1 manufacturing process welding inserts;

[0007] S2: placing a process welding insert in the interval between adjacent lower elastic ear seats, and welding the process welding insert to the upper and lower end surfaces of the lower elastic ear seats;

[0008] S3: Fill the process welding insert and the lower elastic ear seat with paste dental tray powder after welding, and wait for the paste dental tray powder to solidify;

[0009] S4 performs upper and lower symmetrical rough turning, semi-finishing turning, finishing turning and trimming on the lower elastic ear seat of S3, removing the process welding insert, paste tooth base powder and processing allowance to obtain the elastic bearing housing after intermittent turning.

[0010] Furthermore, in S1, the process welding insert is made of the same material as the elastic bearing housing, and the process welding insert is manufactured according to the interval width of adjacent lower elastic ear seats and the thickness of the lower elastic ear seats.

[0011] Furthermore, in S1, after the process welding insert is placed, the distance between it and the wall surfaces of the two adjacent lower elastic ear seats is 0.2mm~0.4mm, and its upper end face and lower end face extend at least 0.5mm beyond the upper end face and lower end face of the lower elastic ear seat after final processing.

[0012] Furthermore, in S2, the welding is spot welding, the diameter of the welding spot is Ф2mm to Ф3mm, and the thickness of the welding spot is less than 2mm.

[0013] Furthermore, in S4, the machining allowance for rough turning is 3 mm to 5 mm, the machining allowance for semi-finishing turning is 0.5 mm to 1 mm, the machining allowance for finishing turning is 0.2 mm to 0.5 mm, and the machining allowance for trimming is 0.05 mm to 0.1 mm.

[0014] Furthermore, in S4, during rough turning, a cutter body with a main rake angle of 45° to 75° and an S-shaped insert with a tip radius of R0.8 to R1.2 are selected.

[0015] Furthermore, in S4, during rough turning, the upper end face is machined first and then the lower end face according to the machining allowance, the cutting depth is 1 mm to 2 mm, and the cutting feed rate is 0.12 mm / r to 0.15 mm / r.

[0016] Furthermore, in S4, a C-shaped insert with a negative rake angle is selected during semi-finishing turning, finishing turning or trimming, and the upper end face is first processed according to the machining allowance, and then the lower end face is processed during the semi-finishing turning, finishing turning or trimming process.

[0017] Furthermore, in S4, during semi-finishing turning, a blade with a tool tip radius of R0.8 to R1.2 is selected, and the cutting feed is 0.1 mm / r to 0.12 mm / r; during finishing turning, a blade with a tool tip radius of R0.8 to R1.2 is selected, and the cutting feed is 0.1 mm / r to 0.12 mm / r; during trimming, the tool tip radius is R0.4 to R0.8, and the cutting feed is 0.08 mm / r to 0.10 mm / r.

[0018] Furthermore, in S4, the dental tray powder and the process welding insert are removed before finishing.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The present invention provides a method for intermittent turning of an elastic bearing housing. By welding process welding inserts between the intervals of the lower elastic ear seats, all the lower elastic ear seats are connected and converted into rigid parts, which can provide good working conditions for rough turning to remove excess. The present invention also fills the lower elastic ear seats and the process welding inserts with paste-like tooth base powder, which can reduce the impact of intermittent cutting on the blade and convert the intermittent cutting into approximately continuous cutting, greatly improving the processing conditions. Secondly, the tooth base powder can increase the rigidity of the elastic ear seats, reduce vibration during processing, improve cutting efficiency, reduce the processing difficulty of intermittent turning of elastic parts, greatly improve processing efficiency, and greatly improve the turning quality of the elastic bearing housing.

[0021] The width setting and thickness setting of the process welding insert of the present invention can ensure that after the rough turning is completed, the welding point of the process welding insert can be removed by turning before semi-finishing, so that the process welding insert is disconnected from the lower elastic ear seat. The early stage of the margin removal turning is a hard connection between the process welding insert and the lower elastic ear seat. The deformation of the elastic bearing housing during the processing process is not released. After the welding point is disconnected, deformation will appear. At this time, there is still margin and space to release the deformation of the elastic ear seat. The fine processing can eliminate the deformation in the rough turning stage.

[0022] The present invention selects a blade type with a strong cutting edge, which is not easy to break when impacted. By specially selecting cutting parameters, the blade life can be extended and higher production efficiency can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the elastic bearing housing structure and casting area;

[0024] Figure 2 Schematic diagram of the welding process between the insert and the lower elastic ear seat; where L is the single-side gap.

[0025] Figure 3 Schematic diagram of the axial assembly position of the process welding insert and the lower elastic ear seat; where H is the single-side thickness and the axial position requirement.

[0026] In the figure: 1—lower elastic ear seat; 2—process welding insert; 3—upper elastic ear seat; 4—tooth tray powder casting area; 5—turning processing area. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention provides a method for intermittent turning of an elastic bearing housing. The structure of the elastic bearing housing is shown in FIG. Figure 1As shown, it includes a lower elastic ear seat 1 and an upper elastic ear seat 3. Both the lower elastic ear seat 1 and the upper elastic ear seat 3 have a turning processing area 5. A plurality of lower elastic ear seats 1 are circumferentially spaced apart on the elastic bearing housing. By welding process welding inserts 2 between the spaced lower elastic ear seats 1, all the lower elastic ear seats 1 are connected and converted into rigid parts. This allows for good working conditions for rough turning to remove the allowance, thereby improving cutting efficiency. The specific steps are as follows:

[0029] 1) Manufacturing process Welding insert 2

[0030] (1) The material of process welding insert 2 is the same as that of the workpiece;

[0031] (2) The width of the process welding insert 2 should ensure that there is a single-side gap L between it and the wall surface of the lower elastic ear seat 1 on one side after assembly. The single-side gap L is 0.2~0.4mm (such as Figure 2 shown);

[0032] (3) The upper and lower end faces of the process welding insert 2 at least exceed the same single-side thickness H of the upper and lower end faces of the lower elastic ear seat 1 after the final processing, and the single-side thickness H is 0.5mm (such as Figure 3 shown);

[0033] The above purpose is to ensure that after the rough turning is completed, the welding point of the process welding insert 2 can be removed by turning before semi-finishing, so that the process welding insert 2 is disconnected from the lower elastic ear seat 1. The early removal of allowance turning is a hard connection between the process welding insert 2 and the lower elastic ear seat 1. The deformation of the elastic bearing housing during the processing process is not released, and deformation will occur after the welding point is disconnected. At this time, there is still allowance, and finishing can eliminate the deformation in the rough turning stage.

[0034] 2) Determine the machining allowance

[0035] Based on the machining allowances of the upper and lower end surfaces of the elastic ear seat 1 at the bottom of the elastic bearing housing, the turning process is divided into four symmetrical stages: rough turning, semi-finishing turning, finishing turning, and trimming. Appropriate machining allowances are reserved for each stage. The machining allowances for rough turning are 3 mm to 5 mm, for semi-finishing turning 0.5 mm to 1 mm, for finishing 0.2 mm to 0.5 mm, and for trimming 0.05 mm to 0.1 mm.

[0036] 3) Select turning tools

[0037] (1) When rough turning, a cutter body with a main deflection angle of 45°~75° is selected. Compared with a large main deflection angle, the same feed per revolution can produce thinner chips, reduce the load on the cutting edge, and thus protect the cutting edge and prevent it from chipping.

[0038] (2) Negative rake angle blades are selected for rough turning, semi-finishing turning, finishing and trimming processes, and the clamping method of the tool shank is rigid clamping.

[0039] (3) When rough turning, use an S (90°) shaped blade with a large cutting depth, low speed, and medium feed to achieve higher production efficiency.

[0040] (4) Use C (80°) blades for semi-finishing, finishing or trimming to ensure that the cutting depth is not greater than the corner radius. At this time, a speed of 40~50r / min and low feed can be used.

[0041] Because it is intermittent turning, the blade type with strong cutting edge is selected, which is not easy to break when impacted. The purpose of selecting cutting parameters is to extend the life of the blade and obtain higher production efficiency.

[0042] 4) Assembly process welding insert 2

[0043] Assemble the process welding insert 2 between the two lower elastic ear seats 1, ensuring a single-side gap of 0.2~0.4mm (such as Figure 2 As shown), its purpose is to have space to release the deformation of the adjacent lower elastic ear seats 1 after the process welding insert 2 is disconnected from the two lower elastic ear seats 1 before finishing.

[0044] 5) Positioning spot welding process welding insert 2 (such as Figure 2 As shown, the process welding inserts 2 are spot welded to the upper and lower end surfaces of the lower elastic lugs 1 on either side. The weld spot diameter is 2 to 3 mm and the weld thickness is less than 2 mm. Connecting all lower elastic lugs 1 with the process welding inserts 2 converts them into rigid parts, providing excellent conditions for rough turning to remove excess stock, improving cutting efficiency.

[0045] 6) Casting tray powder (such as Figure 1 shown);

[0046] Apply an appropriate amount of self-setting denture water to form the denture powder into a paste. Fill the denture powder pouring area 4 around the lower elastic ear seat 1 and the process welding insert 2 with the paste, compact it, and leave it at room temperature for at least 2 hours to solidify. Using denture powder can reduce the impact of intermittent cutting on the blade, converting intermittent cutting into a near-continuous cutting, greatly improving the processing conditions. Denture powder also increases the rigidity of the elastic ear seat, reducing vibration during processing.

[0047] 7) Rough turning of the upper and lower surfaces of the lower elastic ear seat 1

[0048] According to the machining allowance determined in step 2, first machine the upper end face and then the lower end face. Use an S-shaped blade with a tip radius of R0.8~R1.2 and a machine-clamped blade. The cutting depth is 1mm~2mm and the cutting feed rate is 0.12~0.15mm / r.

[0049] 8) Semi-finishing turning of the upper and lower surfaces of the lower elastic ear seat 1

[0050] According to the machining allowance determined in step 2, finish the upper end face first, then the lower end face. Use a C-shaped blade with a tip radius of R0.8-R1.2 and a cutting feed rate of 0.1-0.12mm / r.

[0051] 9) Finish turning the upper and lower surfaces of the lower elastic ear seat 1

[0052] Finish turn the upper end face first, then the lower end face, according to the machining allowance determined in step 2. Use a C-shaped insert with a machine-clamped insert with a tip radius of R0.8 to R1.2, and a cutting feed rate of 0.1 to 0.12 mm / r.

[0053] 10) Remove the dental tray powder and process the welding insert 2

[0054] 11) Finishing the surface

[0055] At this time, the lower elastic ear seat 1 is in a free state. The surface of the lower elastic ear seat 1 is polished to eliminate the final deformation. A C-shaped blade with a tip radius of R0.8~R1.2 and a machine-clamped blade is selected, and the cutting feed rate is 0.08~0.10mm / r.

[0056] Example

[0057] The present invention mainly comprises the following steps:

[0058] 1) Manufacturing process Welding insert 2

[0059] The material of process welding insert 2 is martensitic stainless steel, the same material as the workpiece; the width is 59.6 mm and the thickness is 27.5 mm.

[0060] 2) Determine the machining allowance

[0061] According to the machining allowance of 5mm on the upper and lower end surfaces of the lower elastic ear seat 1, 3.5mm is removed by rough turning, 1mm by semi-finishing turning, 0.4mm by fine turning and 0.1mm by trimming.

[0062] 3) Select turning tools

[0063] Use a tool body with a 75° main rake angle and an S (90°) shaped blade with a 0.8° tip radius.

[0064] 4) Assembly process welding insert 2

[0065] The elastic bearing housing has a plurality of lower elastic ears 1 arranged at intervals in the axial direction. The process welding insert 2 is assembled between two adjacent lower elastic ears 1 to ensure that the single-side gap L between the process welding insert 2 and the two adjacent lower elastic ears 1 is within the range of 0.2~0.4mm (such as Figure 2 shown).

[0066] 5) Positioning spot welding process welding insert 2

[0067] The process welding insert 2 is spot welded to the upper and lower end surfaces of the two adjacent lower elastic ear seats 1, with the diameter of the welding spot being 2 to 3 mm and the thickness of the welding spot being less than 2 mm.

[0068] 6) pouring the tray powder;

[0069] Apply an appropriate amount of self-curing dental tray water to make the dental tray powder into a paste. Fill the periphery of the lower elastic ear seat 1 and the process welding insert 2 with the paste dental tray powder, compact it, and wait for it to solidify.

[0070] 8) According to the machining allowance determined in step 2, perform rough turning, semi-finishing turning and finishing turning in an upper and lower symmetrical manner.

[0071] 10) Remove the dental tray powder and process welding insert 2.

[0072] 11) At this time, the lower elastic ear seat 1 is in a free state. A machine-clamped blade with a tip radius of R0.8 and a cutting feed rate of 0.08 mm / r is used to trim the lower elastic ear seat 1 to ensure the roughness and shape and position dimensions of the elastic bearing housing, and obtain the trimmed elastic bearing housing.

Claims

1. A method for intermittent turning of an elastic bearing housing, characterized in that: The specific steps are as follows: S1 Manufacturing process Welding insert (2); S2: placing a process welding insert (2) in the interval between adjacent lower elastic ear seats (1), and welding the process welding insert (2) to the upper and lower end surfaces of the lower elastic ear seats (1); S3: filling the process welding insert (2) and the lower elastic ear seat (1) with paste-like tooth tray powder after welding, and waiting for the paste-like tooth tray powder to solidify; S4 performs intermittent turning on the lower elastic ear seat (1) of S3 symmetrically in the upper and lower directions, including rough turning, semi-finishing turning, finishing turning and trimming, and removes the process welding insert (2), the paste tooth base powder and the machining allowance to obtain the elastic bearing housing after intermittent turning; In S1, the material of the process welding insert (2) is selected to be the same as that of the elastic bearing housing, and the process welding insert (2) is manufactured according to the interval width of adjacent lower elastic ear seats (1) and the thickness of the lower elastic ear seat (1); In S1, the distance between the process welding insert (2) and the wall surface of the two adjacent lower elastic ear seats (1) after placement is 0.2mm~0.4mm, and the upper end surface and the lower end surface thereof are at least 0.5mm beyond the upper end surface and the lower end surface of the lower elastic ear seat (1) after final processing; In S4, the machining allowance for rough turning is 3 mm to 5 mm, the machining allowance for semi-finishing turning is 0.5 mm to 1 mm, the machining allowance for finishing turning is 0.2 mm to 0.5 mm, and the machining allowance for trimming is 0.05 mm to 0.1 mm.

2. The method for intermittent turning of an elastic bearing housing according to claim 1, characterized in that: In S2, the welding is spot welding, the diameter of the spot welding spot is Φ2mm to Φ3mm, and the thickness of the spot welding spot is less than 2mm.

3. The method for intermittent turning of an elastic bearing housing according to claim 1, characterized in that: In S4, when rough turning, a tool body with a main rake angle of 45°~75°, an S-shaped insert with a negative rake angle, and a tool tip radius of R0.8~R1.2 are selected.

4. The method for intermittent turning of an elastic bearing housing according to claim 3, characterized in that: In S4, during rough turning, the upper end face is machined first and then the lower end face according to the machining allowance, the cutting depth is 1mm~2mm, and the cutting feed rate is 0.12mm / r~0.15mm / r.

5. The method for intermittent turning of an elastic bearing housing according to claim 1, characterized in that: In S4, a C-shaped insert with a negative rake angle is selected for semi-finishing, finishing or trimming. The upper end face is processed first and then the lower end face according to the machining allowance during the semi-finishing, finishing or trimming process.

6. The method for intermittent turning of an elastic bearing housing according to claim 5, characterized in that: In S4, during semi-finishing turning, a blade with a tool tip radius of R0.8 to R1.2 is selected, and the cutting feed rate is 0.1 mm / r to 0.12 mm / r; during finishing turning, a blade with a tool tip radius of R0.8 to R1.2 is selected, and the cutting feed rate is 0.1 mm / r to 0.12 mm / r; during trimming, the tool tip radius is R0.4 to R0.8, and the cutting feed rate is 0.08 mm / r to 0.10 mm / r.

Images