Clamp for improving machining quality of inner and outer end faces of thin-walled titanium alloy welded frame body

Abstract

This utility model discloses a fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame. It includes a fixture for milling the inner end face of the left support arm, a fixture for milling the inner end face of the right support arm, and fixtures for milling the outer end faces of the left and right support arms. When machining the inner end faces of the left and right support arms of the titanium alloy fork-shaped frame, the fixture for milling the inner end face of the left support arm is mounted on the base on the left side of the worktable and on the left support arm of the titanium alloy fork-shaped frame, and the fixture for milling the inner end face of the right support arm is mounted on the base on the right side of the worktable and on the right support arm of the titanium alloy fork-shaped frame. After machining, both fixtures are removed. When machining the outer end faces of the left and right support arms of the titanium alloy fork-shaped frame, the fixtures for milling the outer end faces of the left and right support arms are connected between the process holes for welding at the upper middle part of the left and right support arms of the titanium alloy fork-shaped frame. This invention improves the rigidity of the local system on the inner and outer end faces of the left and right support arms of the workpiece.

Description

Technical Field

[0001] This utility model relates to a fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame, belonging to the field of mechanical technology. Background Technology

[0002] In the production of artillery parts, a thin-walled titanium alloy welded workpiece needs to be processed. Its outline shape is similar to a tuning fork-shaped frame. The fork-shaped support arms have symmetrically designed trunnion chambers with a diameter close to Ф150 at a height of about 500mm, and a balance support hole structure at a height of about 1000mm. The two end arms are made of 10mm thick titanium alloy plates welded to this height in an alternating manner, and covered with a 15mm thick skirt plate and welded on top. During the cutting process, resonance is easily caused due to the tuning fork effect. The trunnion and balance support hole are located at a high position and have poor local rigidity, which has a significant impact on the finishing process. The machined surface is very easy to form a wavy shape, which cannot meet the dimensional accuracy, shape and position accuracy and surface roughness requirements of the product drawings.

[0003] Moreover, titanium alloys are characterized by high strength, poor thermal conductivity, severe work hardening, and significant elastic deformation, resulting in low processing efficiency and poor cutting quality, making it difficult to meet the requirements of product drawings.

[0004] The inner and outer end faces of the left and right support arm balance brackets and the inner and outer end faces of the left and right trunnions of this workpiece all need to be machined. Therefore, when machining the inner end face, auxiliary support is required on the outer end face of the support arm balance bracket. When machining the outer end face, the auxiliary support on the outer end face needs to be removed and replaced with auxiliary support on the inner end face to improve the local rigidity of the workpiece. The adjustment process is too cumbersome, and the auxiliary adjustment time exceeds the actual operation time for machining the end face. The height of the workpiece auxiliary clamping shim is too high and the clamping space is too small, which poses a safety hazard. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame. This fixture effectively improves the rigidity of the local system of the inner and outer end faces of the left and right support arms of the workpiece.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame, including a fixture for milling the inner end face of the left support arm, a fixture for milling the inner end face of the right support arm, and fixtures for milling the outer end faces of the left and right support arms. When machining the inner end face of the left support arm and the inner end face of the right support arm of the titanium alloy fork-shaped frame, the fixture for milling the inner end face of the left support arm is installed on the base on the left side of the workbench and on the left support arm of the titanium alloy fork-shaped frame, and the fixture for milling the inner end face of the right support arm is installed on the base on the right side of the workbench and on the right support arm of the titanium alloy fork-shaped frame. After machining, the fixtures for milling the inner end face of the left support arm and the right support arm are removed.

[0007] When machining the outer end faces of the left and right support arms of the titanium alloy fork frame, the milled outer end faces of the left and right support arms are horizontally connected by a fixture between the process hole for welding at the upper middle part of the left support arm and the process hole for welding at the upper middle part of the right support arm.

[0008] The fixture for milling the inner end face of the left support arm includes a spherical nut I, a spherical washer I, a rotating arm assembly I, a tie rod assembly I, a positioning sleeve I, a hex socket screw I, a support seat I, and a retaining washer I. The support seat I is fixedly connected to the outside of the left base. The support seat I is connected to one end of the rotating arm assembly I through the positioning sleeve I, the hex socket screw I, and the retaining washer I. The other end of the rotating arm assembly I is connected to the process hole for welding the upper middle part of the left support arm of the titanium alloy fork-shaped frame through the spherical nut I, the spherical washer I, and the tie rod assembly I.

[0009] The fixture for milling the inner end face of the right support arm includes a support base II, a tie rod assembly II, a spherical nut II, a spherical washer II, a rotating arm assembly II, a positioning sleeve II, a retaining washer II, and an internal hex screw II. The support base II is fixedly connected to the outside of the right base. The support base II is connected to one end of the rotating arm assembly II through the positioning sleeve II, the internal hex screw II, and the retaining washer II. The other end of the rotating arm assembly II is connected to the process hole for welding the upper middle part of the right support arm of the titanium alloy fork-shaped frame through the spherical nut II, the spherical washer II, and the tie rod assembly II.

[0010] The fixture for milling the outer end faces of the left and right support arms includes a right tie rod assembly, a hex socket head cap screw III, a spherical washer III, a spherical nut III, a hex nut, a connecting rod assembly, a double-ended screw, and a left tie rod assembly. One end of the right tie rod assembly is connected to the process hole for welding at the upper middle part of the right support arm of the titanium alloy fork-shaped frame. A hex socket head cap screw III is fitted to the other end of the right tie rod assembly, with the end of the hex socket head cap screw III facing the left support arm of the titanium alloy fork-shaped frame. A spherical nut III is threaded onto the hex socket head cap screw III, and a spherical washer III is fitted between the spherical nut III and the right tie rod assembly.

[0011] The end of the hex socket screw III is threaded into one end of the connecting rod assembly, which is horizontally arranged. One end of the left tie rod assembly is connected to the process hole for welding at the upper middle part of the left support arm of the titanium alloy fork-shaped frame. The other end of the left tie rod assembly is threaded into one end of the double-ended screw, and the other end of the double-ended screw is threaded into the other end of the connecting rod assembly. Near the end of the left tie rod assembly, a spherical nut III is threaded onto the double-ended screw. Between the spherical nut III and the left tie rod assembly, a spherical washer III is fitted onto the double-ended screw. At both ends of the connecting rod assembly, a hexagonal nut is threaded onto both the double-ended screw and the hex socket screw III.

[0012] Furthermore, the tie rod assembly I includes a tie rod body I, a tie rod flange I, and a beveled hexagonal screw I. The tie rod flange I is boss-shaped, and its bottom center is fixedly connected to one end of the tie rod body I. The other end of the tie rod body I is connected to the swing arm assembly I. On both sides of the swing arm assembly I, two spherical nuts I are threaded onto the tie rod body I. Between the two spherical nuts I and the swing arm assembly I, two spherical washers I are connected onto the tie rod body I. A beveled hexagonal screw I is threaded onto the tie rod flange I. The beveled hexagonal screw I is eccentrically arranged in the tie rod flange I. The protruding part of the tie rod flange I and the head of the beveled hexagonal screw I are fitted into the process hole for welding at the upper middle part of the left support arm of the titanium alloy fork-shaped frame, and are tightened and fixed by the beveled hexagonal screw I.

[0013] Furthermore, the tie rod assembly II includes a tie rod body II, a tie rod flange II, and a beveled hexagonal screw II. The tie rod flange II is boss-shaped, and its bottom center is fixedly connected to one end of the tie rod body II. The other end of the tie rod body II is fitted into the swing arm assembly II. On both sides of the swing arm assembly II, two spherical nuts II are threaded onto the tie rod body II. Between the two spherical nuts II and the swing arm assembly II, two spherical washers II are fitted onto the tie rod body II. A beveled hexagonal screw II is threaded into the tie rod flange II. The beveled hexagonal screw II is eccentrically arranged in the tie rod flange II. The protruding part of the tie rod flange II and the head of the beveled hexagonal screw II are fitted into the process hole for welding at the upper middle part of the right support arm of the titanium alloy fork-shaped frame, and are tightened and fixed by the beveled hexagonal screw II.

[0014] Furthermore, the right-side tie rod assembly includes tie rod a and a beveled hexagonal screw A. The bottom of tie rod a is a notched waist-shaped base plate. A circular boss is fixedly connected to the upper side of one side of the base plate. A beveled hexagonal screw A is threaded into the cylindrical protrusion at the top of the boss. The beveled hexagonal screw A is eccentrically arranged in the protrusion of tie rod a.

[0015] The protruding part on one end of the tie rod a of the right tie rod assembly and the beveled hexagonal screw A are connected to the process hole for welding at the upper middle end of the right support arm of the titanium alloy fork-shaped frame. By rotating the beveled hexagonal screw A, the head of the beveled hexagonal screw A is eccentrically tightened into the process hole for welding at the upper middle end of the right support arm of the titanium alloy fork-shaped frame, thus achieving a rigid connection between the right tie rod assembly and the right support arm of the titanium alloy fork-shaped frame; a hexagonal screw III is connected to the other end of the tie rod a of the right tie rod assembly.

[0016] Furthermore, the left tie rod assembly includes tie rod b and a beveled hexagonal screw B. The bottom of tie rod b is an oblong base plate, and a circular boss is fixedly connected to the upper side of one side of the base plate. A beveled hexagonal screw B is threaded into the cylindrical protrusion at the top of the boss. The beveled hexagonal screw B is eccentrically arranged in the protrusion of tie rod b.

[0017] The protruding part on one end of the tie rod b of the left tie rod assembly and the beveled hexagonal screw B are connected to the process hole for welding at the upper middle end of the left support arm of the titanium alloy fork-shaped frame. By rotating the beveled hexagonal screw B, the head of the beveled hexagonal screw B is eccentrically tightened into the process hole for welding at the upper middle end of the left support arm of the titanium alloy fork-shaped frame, thus achieving a rigid connection between the left tie rod assembly and the left support arm of the titanium alloy fork-shaped frame; the other end of the tie rod b of the left tie rod assembly is threadedly connected to one end of a double-ended screw.

[0018] Furthermore, a positioning sleeve I is installed at the center of the outer side of the support base I, and an internal hexagon screw I is installed in the positioning sleeve I. A retainer I is connected to the internal hexagon screw I. In the circumferential direction around the internal hexagon screw I, four other internal hexagon screws I are threadedly connected to the support base I at even intervals.

[0019] Furthermore, a positioning sleeve II is installed at the center of the outer side of the support base II, and an internal hexagon screw II is installed in the positioning sleeve II. A retainer II is connected to the internal hexagon screw II. In the circumferential direction around the internal hexagon screw II, four other internal hexagon screws II are threadedly connected to the support base II at even intervals.

[0020] The beneficial effects of this utility model are: (1) This fixture is suitable for cutting environments where the rigidity of the local system of the workpiece is poor. Using this fixture can effectively improve the rigidity of the local system when milling the inner and outer end faces of the workpiece. When milling the inner end face, the fixture is positioned by the process hole of the workpiece welding and the outer end face of the support arm. During the milling process, the fixture bears both the milling compressive stress and the milling tensile stress. After the inner end face is milled, a simple adjustment is made to ensure that the fixture does not interfere with the tool when milling the outer end face, thereby maximizing the rigidity of the local system of the inner and outer end faces of the left and right support arms of the workpiece. (2) By rotating the hexagonal screw with the beveled nail head, a radius difference eccentric tension is generated between the positioning shaft that is threaded to it, so as to ensure that the tie rod assembly and the welding process hole of the support arm are rigidly connected; (3) The rotating arm assembly can rotate radially around the outer positioning sleeve of the support base. The four screws around the positioning sleeve ensure that the rotating arm is rigidly connected to the outside of the support base. The fastening and disassembly process is relatively easy to achieve. (4) A concentric arc groove is machined on the other side of the swing arm to facilitate the compensation of welding errors of the thin-walled fork-shaped titanium alloy frame and the positioning errors of the fixture installation; (5) The spherical nut is used in conjunction with the spherical washer, which helps to compensate for the perpendicularity error between the positioning plane and the positioning hole; (6) The fixture has a simple structure and is easy to manufacture. It uses common bolts, screws and pressure plates, and the manufacturing process is mature and the cost is low. (7) The fixture is easy to operate and adjust during use. It uses common bolts, nuts and pressure plates and does not require special auxiliary clamping tools.

[0021] This auxiliary fixture has a compact design, which is designed in conjunction with the workpiece contour and the clamping size of the worktable. After the base is clamped, it basically does not need to be adjusted. It is suitable for the characteristics of CNC equipment to process multiple varieties and small batches. The positional deviation of the workpiece clamping is small. After clamping, the workpiece can be processed by making a slight adjustment at the zero point. It is very suitable for the machining of thin-walled irregular titanium alloy workpieces with poor local rigidity during positioning and clamping, and improves the local system rigidity of the workpiece. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the fixture for milling the inner end face of the left support arm according to this utility model during use.

[0024] Figure 2 yes Figure 1 Side view of the fixture used for milling the inner end face of the middle left support arm.

[0025] Figure 3 This is a schematic diagram of the fixture for milling the inner end face of the right support arm according to this utility model during use.

[0026] Figure 4 yes Figure 3 Side view of the fixture used for milling the inner end face of the right support arm.

[0027] Figure 5 This is the front view of the fixture for milling the outer end face of the left and right support arms of this utility model.

[0028] Figure 6 yes Figure 5 Side view.

[0029] Figure 7 This is a front view of the right-side tie rod assembly of this utility model.

[0030] Figure 8 yes Figure 7 Side view.

[0031] Figure 9 This is a front view of the left-side tie rod assembly of this utility model.

[0032] Figure 10 yes Figure 9 Side view.

[0033] Figure 11 This is the front view of the tie rod assembly I of this utility model.

[0034] Figure 12 yes Figure 10 Side view.

[0035] Figure 13 This is the front view of the tie rod assembly II of this utility model.

[0036] Numbering on the map: 1. Fixture for milling the inner end face of the left support arm: 101. Spherical nut I; 102. Spherical washer I; 103. Rotary arm assembly I; 104. Tie rod assembly I; 1041. Tie rod body I; 1042. Tie rod flange I; 1043. Hexagonal screw with beveled head I; 105. Positioning sleeve I; 106. Socket head screw I; 107. Support seat I; 108. Stop washer I; 2. Fixture for milling the inner end face of the right support arm: 201. Support seat II; 202. Tie rod assembly II; 2021. Tie rod body II; 2022. Tie rod flange II; 2023. Hexagonal screw with beveled head II; 203. Spherical nut II; 204. Spherical washer II; 20 5. Rotary arm assembly II; 206. Positioning sleeve II; 207. Stop washer II; 208. Socket head cap screw II; 3. Fixture for milling the outer end face of the left and right support arms; 301. Right side tie rod assembly; 3011. Tie rod a; 3012. Socket head cap screw A with beveled head; 302. Socket head cap screw III; 303. Spherical washer III; 304. Spherical nut III; 305. Hex nut; 306. Connecting rod assembly; 307. Double-ended screw; 308. Left side tie rod assembly; 3081. Tie rod b; 3082. Socket head cap screw B with beveled head; 4. Base; 5. Left support arm of titanium alloy fork-shaped frame; 6. Right support arm of titanium alloy fork-shaped frame; 7. Worktable. Detailed Implementation

[0037] like Figure 1As shown in Figure 13, a fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame includes a fixture 1 for milling the inner end face of the left support arm, a fixture 2 for milling the inner end face of the right support arm, and fixtures 3 for milling the outer end faces of the left and right support arms. When machining the inner end face of the left support arm 5 and the inner end face of the right support arm 6 of the titanium alloy fork-shaped frame, the fixture 1 for milling the inner end face of the left support arm is installed on the base 4 on the left side of the worktable 7 and on the left support arm 5 of the titanium alloy fork-shaped frame, and the fixture 2 for milling the inner end face of the right support arm is installed on the base 4 on the right side of the worktable 7 and on the right support arm 6 of the titanium alloy fork-shaped frame. After machining, the fixture 1 for milling the inner end face of the left support arm and the fixture 2 for milling the inner end face of the right support arm are removed.

[0038] When machining the outer end faces of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame, the milled outer end faces of the left and right supports are horizontally connected between the process hole for welding at the upper middle part of the left support arm 5 and the process hole for welding at the upper middle part of the right support arm 6 of the titanium alloy fork frame using a fixture 3.

[0039] The fixture 1 for milling the inner end face of the left support arm includes a spherical nut I101, a spherical washer I102, a rotating arm assembly I103, a tie rod assembly I104, a positioning sleeve I105, a hex socket screw I106, a support seat I107, and a retaining washer I108. The support seat I107 is fixedly connected to the outside of the left base 4. The support seat I107 is connected to one end of the rotating arm assembly I103 through the positioning sleeve I105, the hex socket screw I106, and the retaining washer I108. A positioning washer is installed at the center of the outer side of the support seat I107. A socket head cap screw I106 is installed in the positioning sleeve I105. A retainer I108 is connected to the socket head cap screw I106. In the circumferential direction around the socket head cap screw I106, four other socket head cap screws I106 are threaded on the support seat I107 at even intervals. The other end of the swing arm assembly I103 is connected to the upper end of the welding process hole of the left support arm 5 of the titanium alloy fork frame through the spherical nut I101, the spherical washer I102 and the tie rod assembly I104.

[0040] The tie rod assembly I104 includes a tie rod body I1041, a tie rod flange I1042, and a beveled hexagonal screw I1043. The tie rod flange I1042 is boss-shaped and is fixedly connected to one end of the tie rod body I1041 at its bottom center. The other end of the tie rod body I1041 is fitted into the swing arm assembly I103. On both sides of the swing arm assembly I103, two spherical nuts I101 are threaded onto the tie rod body I1041; the two spherical nuts I101 are connected to the swing arm assembly I103. Between them, two spherical pads I102 are connected to the tie rod body I1041; a hexagonal screw I1043 with a beveled head is threaded into the tie rod flange I1042. The hexagonal screw I1043 with a beveled head is eccentrically arranged in the tie rod flange I1042. The protruding part of the tie rod flange I1042 and the head of the hexagonal screw I1043 are fitted into the process hole for welding at the upper end of the left support arm 5 of the titanium alloy fork-shaped frame, and are tightened and fixed by the hexagonal screw I1043 with a beveled head.

[0041] The fixture 2 for milling the inner end face of the right support arm includes a support base II 201, a tie rod assembly II 202, a spherical nut II 203, a spherical washer II 204, a rotating arm assembly II 205, a positioning sleeve II 206, a retaining washer II 207, and a socket head cap screw II 208. The support base II 201 is fixedly connected to the outside of the right base 4. The support base II 201 is connected to one end of the rotating arm assembly II 205 through the positioning sleeve II 206, the socket head cap screw II 208, and the retaining washer II 207. A positioning sleeve is installed at the center of the outer side of the support base II 201. A socket head cap screw II208 is installed in the positioning sleeve II206. A retainer II207 is connected to the socket head cap screw II208. In the circumferential direction around the socket head cap screw II208, four other socket head cap screws II208 are threaded on the support seat II201 at even intervals. The other end of the swing arm assembly II205 is connected to the upper end of the right support arm 6 of the titanium alloy fork frame through the spherical nut II203, the spherical washer II204 and the tie rod assembly II202.

[0042] The tie rod assembly II202 includes a tie rod body II2021, a tie rod flange II2022, and a beveled hexagonal screw II2023. The tie rod flange II022 is boss-shaped, and its bottom center is fixedly connected to one end of the tie rod body II2021. The other end of the tie rod body II021 is fitted into the swing arm assembly II205. On both sides of the swing arm assembly II205, two spherical nuts II203 are threaded onto the tie rod body II2021; the two spherical nuts II203 are connected to the swing arm assembly II205. Between them, two spherical pads II204 are connected to the tie rod body II2021; a hexagonal screw II2023 with a beveled head is threaded into the tie rod flange II2022. The hexagonal screw II2023 with a beveled head is eccentrically arranged in the tie rod flange II2022. The protruding part of the tie rod flange II2022 and the head of the hexagonal screw II2023 are fitted into the process hole for welding at the upper end of the right support arm 6 of the titanium alloy fork-shaped frame, and are tightened and fixed by the hexagonal screw II2023 with a beveled head.

[0043] The fixture 3 for milling the outer end faces of the left and right support arms includes a right tie rod assembly 301, a hex socket screw III 302, a spherical washer III 303, a spherical nut III 304, a hex nut 305, a connecting rod assembly 306, a double-ended screw 307, and a left tie rod assembly 308. The right tie rod assembly 301 includes a tie rod a 3011 and a hex socket screw A 3012 with a beveled head. The bottom of the tie rod a 3011 is a waist-shaped base plate with a notch. A circular boss is fixedly connected to the upper side of one side of the base plate. A beveled head is threaded into the cylindrical protrusion at the top of the boss. The hexagonal screw A3012 with a beveled head is eccentrically arranged in the protrusion of the pull rod a3011; the left pull rod assembly 308 includes a pull rod b3081 and a hexagonal screw B3082 with a beveled head. The bottom of the pull rod b3081 is an oblong base plate. A circular boss is fixedly connected to the upper side of one side of the base plate. A hexagonal screw B3082 with a beveled head is threaded into the cylindrical protrusion at the top of the boss. The hexagonal screw B3082 with a beveled head is eccentrically arranged in the protrusion of the pull rod b3081.

[0044] The protruding part on one end of the pull rod a3011 of the right-side pull rod assembly 301 and the beveled hexagonal screw A3012 are connected to the welding process hole at the upper end of the right support arm 6 of the titanium alloy fork-shaped frame. By rotating the beveled hexagonal screw A3012, the head of the beveled hexagonal screw A3012 is eccentrically tightened into the welding process hole at the upper end of the right support arm 6 of the titanium alloy fork-shaped frame, thus realizing the connection between the right-side pull rod assembly 301 and the titanium alloy fork. The rigid connection of the right support arm 6 of the frame body; a hexagonal socket screw III302 is connected to the other end of the pull rod a3011 of the right tie rod assembly 301, with the end of the hexagonal socket screw III302 facing the left support arm 5 of the titanium alloy fork-shaped frame body; a spherical nut III304 is threaded onto the hexagonal socket screw III302, and a spherical washer III303 is connected between the spherical nut III304 and the pull rod a3011 of the right tie rod assembly 301, and the hexagonal socket screw III302.

[0045] The end of the socket head cap screw III302 is threaded into one end of the connecting rod assembly 306, which is horizontally arranged. The protruding portion of the pull rod b3081 of the left tie rod assembly 308 and the beveled socket head cap screw B3082 are connected to the upper welding process hole in the left support arm 5 of the titanium alloy fork-shaped frame. Rotating the beveled socket head cap screw B3082 causes its head to eccentrically tighten into the upper welding process hole in the left support arm 5 of the titanium alloy fork-shaped frame, thus achieving rigidity between the left tie rod assembly 308 and the left support arm 5 of the titanium alloy fork-shaped frame. Connections: The other end of the pull rod b3081 of the left pull rod assembly 308 is threaded to one end of the double-ended screw 307, and the other end of the double-ended screw 307 is threaded to the other end of the connecting rod assembly 306; a spherical nut Ⅲ304 is threaded onto the double-ended screw 307 near the end of the left pull rod assembly 308; a spherical washer Ⅲ303 is fitted onto the double-ended screw 307 between the spherical nut Ⅲ304 and the pull rod b3081 of the left pull rod assembly 308; a hexagonal nut 305 is threaded onto both the double-ended screw 307 and the internal hexagonal screw Ⅲ302 at both ends of the connecting rod assembly 306.

[0046] The fixture 1 for milling the inner end face of the left support arm and the fixture 2 for milling the inner end face of the right support arm of the thin-walled tuning fork-shaped titanium alloy frame are respectively machined with positioning holes on the outer side of support seat I107 and support seat II201. Positioning sleeve I105 and positioning sleeve II206 are respectively installed in the positioning holes. Rotatable titanium alloy fork-shaped frame left support arm 5 and titanium alloy fork-shaped frame right support arm 6 are arranged around positioning sleeve I105 and positioning sleeve II206. The rotating arm is assembled with I107 using hexagonal screws and retaining washers. 3 and the swing arm assembly II 205 are axially positioned on the outside of support seat I 107 and support seat II 201, respectively, and can rotate around positioning sleeve I 105 and positioning sleeve II 206; the other end of the swing arm assembly I 103 and the swing arm assembly II 205 are provided with a semi-through arc groove, and the arc groove hooks are respectively hung on the outside of tie rod assembly I 104 and tie rod assembly II 202, and the swing arm assembly I 103 and the swing arm assembly II 205 are clamped and secured by two sets of inner and outer arc nuts and arc washers.

[0047] The other end of tie rod assembly I104 and the other end of tie rod assembly II202 are respectively equipped with beveled hexagonal screws I1043 and II2023. These screws, in conjunction with the shaft diameters of tie rod assembly I104 and tie rod assembly II202, are inserted into the welding process holes on the left support arm 5 and right support arm 6 of the thin-walled tuning fork-shaped titanium alloy frame. By rotating the beveled hexagonal screws I1043 and II2023, the shaft diameters eccentrically tighten within the process holes, achieving... The tie rod assembly is rigidly connected to the titanium alloy fork-shaped frame. In addition, four screw holes are evenly distributed around the positioning sleeve I105 of the swing arm assembly I103 and around the positioning sleeve II206 of the swing arm assembly II205. Four hex socket head cap screws I106 and four hex socket head cap screws II208 are inserted and locked respectively. After the tie rod assembly I104 and tie rod assembly II202 are rigidly connected to the swing arm assembly I103 and the swing arm assembly II205 respectively, the reliable connection between the swing arm assembly I103 and the swing arm assembly II205 and the support base I107 and the support base II201 is achieved respectively.

[0048] The fixture 3 for milling the outer end faces of the left and right support arms is used to enhance the rigidity of the system after the inner end face of the thin-walled tuning fork-shaped titanium alloy frame is sized. The left tie rod assembly 308 and the right tie rod assembly 301 are respectively connected to the welding process holes on the left support arm 5 and the right support arm 6 of the titanium alloy fork-shaped frame and are provided with matching shaft diameters. Inside them are respectively eccentrically fitted hexagonal screws B3082 and A3012 with beveled nail heads, which are inserted into the left support arm 5 and the right support arm 6 of the titanium alloy fork-shaped frame, respectively. Inside the process hole for welding, the screw is tightened by eccentric rotation. The other ends of the left tie rod assembly 308 and the right tie rod assembly 301 are respectively inserted into the double-ended screw 307 and the internal hexagon screw III 302. The double-ended screw 307 and the internal hexagon screw III 302 are rigidly connected to the connecting rod assembly 306, the left tie rod assembly 308, and the right tie rod assembly 301 by the spherical nut and the spherical washer, thereby improving the local rigidity of the workpiece on the outer end face of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame.

[0049] How to use: 1) Position and clamp the titanium alloy fork-shaped frame onto the workbench 7. 2) Adjust the position of base 4 relative to the workpiece and clamp base 4; 3) Adjust the beveled hexagonal screws I1043 and II2023 on tie rod assembly I104 and tie rod assembly II202 respectively, so that tie rod assembly I104 and tie rod assembly II202 pass through the welding process holes from the outside of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame respectively. Rotate the beveled hexagonal screws I1043 and II2023 respectively, and eccentrically tighten them in the welding process holes on the outer end face of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame, in accordance with the side shaft diameters of tie rod assembly I104 and tie rod assembly II202. 4) Remove the four hexagonal screws evenly distributed on the outside of positioning sleeve I105 and positioning sleeve II206. Rotate the rotating arm assembly I103 and rotating arm assembly II205 around positioning sleeve I105 and positioning sleeve II206 so that the arc groove on the other side of rotating arm assembly I103 and the arc groove on the other side of rotating arm assembly II205 hook onto the outside of tie rod assembly I104 and tie rod assembly II202 respectively. At the same time, adjust the corresponding angles so that the four hexagonal screws on the outside of positioning sleeve I105 and positioning sleeve II206 are inserted into the corresponding screw holes and tighten them. 5) Adjust the inner and outer sets of arc nuts and arc pads to clamp and secure the rotating arm assembly I103 and rotating arm assembly II205, forming a rigid connection on the outer sides of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame, so as to improve the local rigidity of the workpiece system when milling the inner end face of the left support arm 5 and the inner end face of the right support arm 6 of the titanium alloy fork frame; 6) After the inner end face milling is completed, loosen and remove the spherical nut and spherical washer; 7) Loosen the beveled hexagonal screws I1043 and II2023 on the tie rod assembly I104 side and tie rod assembly II202 side, and remove tie rod assembly I104 and tie rod assembly II202. 8) Remove the four hexagonal screws around positioning sleeve I105 and positioning sleeve II206 respectively, so that the rotating arm assembly I103 and rotating arm assembly II205 can rotate around positioning sleeve I105 and positioning sleeve II206 to a suitable position, making enough space to meet the requirements of the tool milling the outer surface of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame. Insert the four screws into the corresponding screw holes to press the rotating arm assembly I103 and rotating arm assembly II205 to prevent the rotation around positioning sleeve I105 and positioning sleeve II206 during the milling process from interfering with the milling work. 9) Adjust the beveled hexagonal screws B3082 and A3012 of the left tie rod assembly 308 and the right tie rod assembly 301, respectively, and insert them into the welding process holes on the left support arm 5 and the right support arm 6 of the titanium alloy fork frame. Adjust the beveled hexagonal screws B3082 and A3012 to make the left tie rod assembly 308 and the right tie rod assembly 301 tighten inside the left support arm 5 and the right support arm 6 of the titanium alloy fork frame, respectively. 10) The other end of the left tie rod assembly 308 and the other end of the right tie rod assembly 301 are respectively inserted into the double-ended screw 307 and the internal hexagon screw III 302. The double-ended screw 307 and the internal hexagon screw III 302 are rigidly connected to the connecting rod assembly 306 and the other end of the left tie rod assembly 308 and the right tie rod assembly 301 through the spherical nut and spherical washer; thereby improving the local rigidity of the workpiece on the outer end face of the left support arm 5 and the outer end face of the right support arm 6 of the titanium alloy fork frame respectively. 11) After milling the outer end face of the left support arm 5 and the outer end face of the right support arm 6 of the titanium alloy fork frame, loosen the spherical nut and disassemble the connecting rod assembly 306. 12) Loosen the beveled hexagonal screws B3082 and A3012 from the welding process holes on the outside of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame, respectively, and remove the left tie rod assembly 308 and the right tie rod assembly 301, respectively, to complete the milling of the outer end face of the left support arm 5 and the right support arm 6 of the titanium alloy fork frame.

[0050] Using the above processing method, the end faces of the trunnions of the two side arms and the holes of the balance bracket of the thin-walled tuning fork-shaped titanium alloy welded frame are milled, which greatly enhances the local rigidity. The arithmetic mean deviation Ra of the surface profile after milling can reach more than 3.2, close to 1.6. The machining dimensions of the inner and outer end faces are easier to measure accurately, so the dimensions are easier to control.

Claims

1. A fixture for improving the machining quality of the inner and outer end faces of a thin-walled titanium alloy welded frame, characterized in that: The equipment includes a jig (1) for milling the inner end face of the left support arm, a jig (2) for milling the inner end face of the right support arm, and jigs (3) for milling the outer end faces of the left and right support arms. When machining the inner end faces of the left support arm (5) and the right support arm (6) of the titanium alloy fork-shaped frame, the jig (1) for milling the inner end face of the left support arm is mounted on the base (4) on the left side of the worktable (7) and on the left support arm (5). The jig (2) for milling the inner end face of the right support arm is mounted on the right side of the worktable (7). The base (4) is on the right support arm (6) of the titanium alloy fork frame; after the machining is completed, the jig (1) for milling the inner end face of the left support arm and the jig (2) for milling the inner end face of the right support arm are removed; when machining the outer end faces of the left support arm (5) and the right support arm (6) of the titanium alloy fork frame, the jig (3) for milling the outer end faces of the left and right support arms is horizontally connected between the process hole for welding at the upper end of the left support arm (5) of the titanium alloy fork frame and the process hole for welding at the upper end of the right support arm (6) of the titanium alloy fork frame; The fixture (1) for milling the inner end face of the left support arm includes a spherical nut I (101), a spherical pad I (102), a rotating arm assembly I (103), a tie rod assembly I (104), a positioning sleeve I (105), an internal hexagon screw I (106), a support seat I (107), and a retaining pad I (108). The support seat I (107) is fixedly connected to the outside of the left base (4). The support seat I (107) is connected to one end of the rotating arm assembly I (103) through the positioning sleeve I (105), the internal hexagon screw I (106), and the retaining pad I (108). The other end of the rotating arm assembly I (103) is connected to the process hole for welding the upper part of the left support arm (5) of the titanium alloy fork frame through the spherical nut I (101), the spherical pad I (102), and the tie rod assembly I (104). The fixture (2) for milling the inner end face of the right support arm includes a support seat II (201), a tie rod assembly II (202), a spherical nut II (203), a spherical pad II (204), a rotating arm assembly II (205), a positioning sleeve II (206), a stop pad II (207), and an internal hex screw II (208). The support seat II (201) is fixedly connected to the outside of the right base (4). The support seat II (201) is connected to one end of the rotating arm assembly II (205) through the positioning sleeve II (206), the internal hex screw II (208), and the stop pad II (207). The other end of the rotating arm assembly II (205) is connected to the process hole for welding the upper part of the right support arm (6) of the titanium alloy fork frame through the spherical nut II (203), the spherical pad II (204), and the tie rod assembly II (202). The fixture (3) for milling the outer end face of the left and right support arms includes a right tie rod assembly (301), a hexagon socket screw III (302), a spherical washer III (303), a spherical nut III (304), a hexagonal nut (305), a connecting rod assembly (306), a double-ended screw (307), and a left tie rod assembly (308). One end of the right tie rod assembly (301) is connected to the process hole for welding the upper end of the right support arm (6) of the titanium alloy fork frame. The other end of the right tie rod assembly (301) is fitted with a hexagon socket screw III (302). The end of the hexagon socket screw III (302) faces the left support arm (5) of the titanium alloy fork frame. A spherical nut III (304) is threaded onto the hexagon socket screw III (302). Between the spherical nut III (304) and the right tie rod assembly (301), a spherical washer III (303) is fitted onto the hexagon socket screw III (302). The end of 302) is threaded to one end of the connecting rod assembly (306), which is horizontally arranged; one end of the left tie rod assembly (308) is connected to the process hole for welding at the upper end of the left support arm (5) of the titanium alloy fork frame, and the other end of the left tie rod assembly (308) is threaded to one end of the double-ended screw (307), and the other end of the double-ended screw (307) is threaded to the other end of the connecting rod assembly (306); near the end of the left tie rod assembly (308), a spherical nut III (304) is threaded on the double-ended screw (307); between the spherical nut III (304) and the left tie rod assembly (308), a spherical washer III (303) is fitted on the double-ended screw (307); at both ends of the connecting rod assembly (306), a hexagonal nut (305) is threaded on both the double-ended screw (307) and the internal hexagonal screw III (302).

2. The fixture of claim 1, wherein: The tie rod assembly I (104) includes a tie rod body I (1041), a tie rod flange I (1042), and a hexagonal screw I (1043) with a beveled head. The tie rod flange I (1042) is boss-shaped, and its bottom center is fixedly connected to one end of the tie rod body I (1041). The other end of the tie rod body I (1041) is fitted into the swing arm assembly I (103). On both sides of the swing arm assembly I (103), two spherical nuts I (101) are threaded onto the tie rod body I (1041). The two spherical nuts I (101) and the swing arm assembly I (1043) are connected to the tie rod body I (1041). Between 103), two spherical pads 1 (102) are connected to the tie rod body 1 (1041); a hexagonal screw 1 (1043) with a beveled head is threaded into the tie rod flange 1 (1042). The hexagonal screw 1 (1043) with a beveled head is eccentrically arranged in the tie rod flange 1 (1042). The protruding part of the tie rod flange 1 (1042) and the head of the hexagonal screw 1 (1043) are fitted into the process hole for welding at the upper end of the left support arm (5) of the titanium alloy fork frame, and are tightened and fixed by the hexagonal screw 1 (1043).

3. The fixture of claim 1, wherein: Tie rod assembly II (202) includes tie rod body II (2021), tie rod flange II (2022), and hexagonal screw II (2023) with beveled head. Tie rod flange II (2022) is boss-shaped. The bottom center of tie rod flange II (2022) is fixedly connected to one end of tie rod body II (2021). The other end of tie rod body II (2021) is fitted into swing arm assembly II (205). On both sides of swing arm assembly II (205), two spherical nuts II (203) are threaded onto tie rod body II (2021). The two spherical nuts II (203) and swing arm assembly II (2021) are connected to each other. Between 205), two spherical pads 204 are connected to the tie rod body Ⅱ (2021); a hexagonal screw Ⅱ (2023) with a beveled head is threaded into the tie rod flange Ⅱ (2022). The hexagonal screw Ⅱ (2023) with a beveled head is eccentrically arranged in the tie rod flange Ⅱ (2022). The protruding part of the tie rod flange Ⅱ (2022) and the head of the hexagonal screw Ⅱ (2023) are fitted into the process hole for welding at the upper end of the right support arm (6) of the titanium alloy fork frame, and are tightened and fixed by the hexagonal screw Ⅱ (2023).

4. The fixture of claim 1, wherein: The right-side tie rod assembly (301) includes a tie rod a (3011) and a beveled hexagonal screw A (3012). The bottom of the tie rod a (3011) is a notched waist-shaped base plate. A circular boss is fixedly connected to the upper part of one side of the base plate. A beveled hexagonal screw A (3012) is threaded into the cylindrical protrusion at the top of the boss. The beveled hexagonal screw A (3012) is eccentrically arranged in the protrusion of the tie rod a (3011). The protrusion and the beveled hexagonal screw A (3012) at one end of the tie rod a (3011) of the right-side tie rod assembly (301) are connected to the cylindrical protrusion at the top of the boss. A hexagonal screw A (3012) is fitted into the process hole for welding at the upper end of the right support arm (6) of the titanium alloy fork-shaped frame. The hexagonal screw A (3012) with the beveled head is rotated, and the head of the hexagonal screw A (3012) with the beveled head is eccentrically tightened into the process hole for welding at the upper end of the right support arm (6) of the titanium alloy fork-shaped frame, so as to realize the rigid connection between the right tie rod assembly (301) and the right support arm (6) of the titanium alloy fork-shaped frame. A hexagonal screw III (302) is fitted into the other end of the tie rod a (3011) of the right tie rod assembly (301).

5. The fixture of claim 1, wherein: The left tie rod assembly (308) includes a tie rod b (3081) and a beveled hexagonal screw B (3082). The bottom of the tie rod b (3081) is an oblong base plate. A circular boss is fixedly connected to the upper side of one side of the base plate. The cylindrical protrusion on the top of the boss is eccentrically arranged, and a beveled hexagonal screw B (3082) is threaded into the cylindrical protrusion. The protrusion on one end of the tie rod b (3081) of the left tie rod assembly (308) and the beveled hexagonal screw B (3082) cooperate. The process hole for welding at the upper end of the left support arm (5) of the titanium alloy fork frame is connected to the rotating hexagonal screw B (3082) with beveled nail head. The head of the hexagonal screw B (3082) with beveled nail head is eccentrically tightened in the process hole for welding at the upper end of the left support arm (5) of the titanium alloy fork frame, so as to realize the rigid connection between the left tie rod assembly (308) and the left support arm (5) of the titanium alloy fork frame; the other end of the tie rod b (3081) of the left tie rod assembly (308) is threaded to one end of the double-ended screw (307).

6. The fixture of claim 1, wherein: A positioning sleeve I (105) is installed at the center of the outer side of the support base I (107). A socket head cap screw I (106) is installed in the positioning sleeve I (105). A retainer I (108) is connected to the socket head cap screw I (106). In the circumferential direction around the socket head cap screw I (106), four other socket head cap screws I (106) are threaded on the support base I (107) at even intervals.

7. The fixture of claim 1, wherein: A positioning sleeve II (206) is installed at the center of the outer side of the support base II (201). A socket head cap screw II (208) is installed in the positioning sleeve II (206). A retainer II (207) is connected to the socket head cap screw II (208). In the circumferential direction around the socket head cap screw II (208), four other socket head cap screws II (208) are threaded on the support base II (201) at even intervals.

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