Low-floor bogie end beam processing positioning fixture

Abstract

The low-floor bogie end beam processing positioning fixture belongs to the field of positioning devices for low-floor train bogie end beam processing, which includes a machine tool docking base, two sets of rubber node installation hanger positioning devices and a set of gear box hanger positioning devices. The two sets of rubber node installation hanger positioning devices are respectively located on the left and right sides of the gear box hanger positioning device. The three are arranged parallel to each other and the bottoms of the three are welded and fixed to the upper end face of the machine tool docking base. The end beam processing positioning fixture of the present invention can complete the processing of all parts of the end beam on a set of fixtures, and completely overcomes the cumbersome and backward method of the old process that requires multiple sets of tooling, changing different clamping methods and clamping positions, and requiring multiple steps to complete the processing of the workpiece. The positioning fixture makes the positioning and processing process of the front end beam A accurate and efficient, can greatly reduce labor intensity, improve production efficiency, save the occupancy time of the machine tool, and thus improve production benefits.

Description

Technical Field

[0001] The invention belongs to the field of positioning devices for machining end beams of low-floor train bogies, and in particular relates to a positioning fixture for machining end beams of low-floor bogies. Background Art

[0002] A new type of bogie for low-floor rail trains, developed for the domestic urban rail project market, features low speed, low noise, and a compact structure. Due to its compact structure, the machining precision requirements for each component are very strict. Furthermore, one end of the gearbox is fixed to the front end beam, making it a critical load-bearing component for this type of bogie.

[0003] like Figures 1 to 5As shown, the front end beam A of the bogie is a welded component, which includes an end beam lower cover plate 1, an obtuse trapezoidal long cover plate 2, an obtuse trapezoidal short cover plate 3, a right-angled trapezoidal long vertical plate 4, a right-angled trapezoidal short vertical plate 5, a gearbox hanger 6 and two rubber node mounting hangers 7. The end beam lower cover plate 1 includes a lower cover plate long plate 1-1, a lower cover plate middle plate 1-2 and a lower cover plate short plate 1-3 that are coplanar with each other; the contour line of the lower cover plate long plate 1-1 is the projection of the long cover plate 2, the right-angled side of the long vertical plate 4 trapezoid is vertically welded to the center line of the long cover plate 1-1, and the oblique angled side of the long vertical plate 4 trapezoid is vertically welded to the center line of the long cover plate 2, and the three together constitute a long crossbeam structure with an I-shaped cross section; the contour line of the lower cover plate short plate 1-3 is the projection of the short cover plate 3, and the right-angled side of the short vertical plate 5 trapezoid is vertically welded to the center line of the long cover plate Connected to the center line of the short plate 1-3 of the lower cover plate, the beveled side of the trapezoid of the short vertical plate 5 is welded vertically to the center line of the short cover plate 3, and the three together also constitute a long beam structure with an I-shaped cross section and a length of L1; the gear box hanger 6 includes a gear box hanger upper cover plate 6-1 with a main body of a rectangular structure, a gear box hanger vertical plate 6-2 with a rectangular structure and a gear box hanging hole seat 6-3, the top long side of the gear box hanger vertical plate 6-2 and the center line of the short side of the gear box hanger upper cover plate 6-1 are welded vertically to each other, the gear box hanging hole seat 6-3 is welded and fixed to the middle part of the outer side wall of the gear box hanger vertical plate 6-2, and the axis of the gear box hanging hole seat 6-3 is perpendicular to the gear box hanger upper cover plate 6-1; along the axial direction of the gear box hanging hole seat 6-3, a gear box hanger hole 6-3-1 with a size of φ26 needs to be opened through a drilling process. The bottom long side of the gearbox hanger vertical plate 6-2 is welded perpendicularly to the midline of the short side of the lower cover middle plate 1-2. The left and right short sides of the gearbox hanger vertical plate 6-2 are respectively welded to the bottom sides of the right-angled trapezoid of the long vertical plate 4 and the bottom sides of the right-angled trapezoid of the short vertical plate 5, and the three together form a coplanar, integrated vertical plate structure. The left and right short sides of the gearbox hanger upper cover 6-1 are respectively welded to the bottom sides of the obtuse-angled trapezoid of the long cover 2 and the bottom sides of the obtuse-angled trapezoid of the short cover 3, and the three together form a bridge-like structure with a horizontal middle section and lowering to the left and right sides. The side walls of the gearbox hanger vertical plate 6-2 are divided by the gearbox hanging hole seat 6-3 into small flat plates 6-2-1 with a width of D1 on the left and right sides.

[0004] The rubber node mounting hanger 7 includes a wedge block base 7-1 which is a right-angled trapezoid in side view and a rubber node mounting seat sleeve 7-2. The rear end face of the wedge block base serving as the lower base of the right-angled trapezoid and the outer side wall of the rubber node mounting seat sleeve 7-2 are connected to each other and formed as one piece; the wedge block base 7-1 also includes a wedge block front end face 7-1-1 serving as the upper base of the right-angled trapezoid, a wedge block welding end face 7-1-2 serving as the right-angled side of the right-angled trapezoid, a wedge block inclined surface 7-1-4 serving as the hypotenuse of the right-angled trapezoid, and wedge block side wall planes 7-1-3 located on both sides of the wedge block inclined surface. The rubber node mounting bracket 7 is vertically welded to the left and right ends of the integral crossbeam via the wedge welded end faces 7-1-2. The rubber node mounting bracket sleeve 7-2 requires two processes: rough boring and fine milling to create a φ80 bore 7-2-1. The left and right bores 7-2-1 must be coaxial, with their axes parallel to the end beam lower cover plate 1 and perpendicular to the gearbox bracket hole 6-3-1. The lower base of the right-angled trapezoid of the wedge base 7-1 is D2, and the overall length of the rubber node mounting bracket 7 is L2.

[0005] The end beam is welded together by castings and steel plates. Its shape is irregular and its center of gravity is biased. Therefore, during the welding process, many positions require auxiliary support and positioning. Many positions to be processed interfere with the support positions, so the selection of processing positioning datums becomes a difficult problem. When developing welding positioning fixtures, it is crucial to select a reasonable positioning datum. Since the welding area of ​​the front end beam A is relatively large, welding deformation is prone to occur. Therefore, in order to ensure the verticality of the center and side of the boring hole 7-2-1 and the coaxiality of the left and right boring holes 7-2-1, it is necessary to complete the milling of the wedge block welding end face 7-1-2 and the axial inner and outer end faces of the rubber node mounting seat sleeve 7-2 with only one clamping, and then bore the boring hole 7-2-1 of the rubber node mounting seat sleeve 7-2. Finally, drill the gear box hanger hole 6-3-1 to ensure that the processed parts meet the required dimensions of the drawing.

[0006] The existing machining positioning method uses industrial clamps to clamp and fix the front beam workpiece. In order to ensure the stability of the center and the clamping force meets the standards, the position of the clamp often blocks and interferes with the position on the workpiece that needs to be processed. Therefore, multiple sets of tooling are required, different clamping methods and clamping positions are changed, and the workpiece is processed in multiple steps. The process method is cumbersome and backward, time-consuming, labor-intensive, and inefficient. In addition, the clamping force is insufficient, and the size of the workpiece after machining is out of tolerance and does not meet the process standards.

[0007] In order to ensure the quality of parts processing while improving its processing efficiency, saving the number of positioning fixtures and the occupancy time of machining center equipment, it is urgent to develop an end beam processing positioning fixture to achieve the production needs of completing the processing of all parts of the end beam in one step. Summary of the Invention

[0008] In order to solve the problem that the front end beam of a certain type of existing bogie has an asymmetric, multi-slope special-shaped I-beam structure with multiple bends, large size, and easy deformation, and the rubber node mounting hangers welded on the left and right ends have a complex wedge block structure, resulting in the wedge block base of the rubber node mounting hanger and the rubber node mounting seat end milling process and the rubber node mounting seat boring process cannot be carried out in one go due to the inability to establish a unified processing reference with the machine tool, thereby causing the existing process to be unable to complete the reasonable clamping and positioning of the front end beam with only one clamping; and the traditional clamp-based positioning method, its clamp position often obscures and interferes with the processing position on the workpiece, so it is necessary to adopt multiple sets of tooling, change different clamping methods and clamping positions, and it is necessary to complete the processing of the workpiece in multiple steps. The process method is cumbersome and backward, time-consuming and labor-intensive, and inefficient. In addition, insufficient clamping force of the clamp often occurs, and the size of the workpiece after machining is out of tolerance and cannot meet the acceptance standard. The present invention provides a low-floor bogie end beam processing and positioning fixture.

[0009] The low-floor bogie end beam processing and positioning fixture includes a machine tool docking base, two sets of rubber node mounting hanger positioning devices and a set of gearbox hanger positioning devices. The two sets of rubber node mounting hanger positioning devices are respectively located on the left and right sides of the gearbox hanger positioning device. The three are arranged parallel to each other and the bottoms of the three are welded and fixedly connected to the upper end surface of the machine tool docking base.

[0010] The rubber node mounting hanger positioning device includes a rubber node mounting hanger positioning mechanism and a rubber node mounting hanger clamping plate. The rubber node mounting hanger positioning mechanism includes a U-shaped frame, a wedge block side wall support bolt and a wedge block front end face lateral positioning bolt. The U-shaped frame includes an integrally formed base beam, a first column and a rubber node mounting hanger outer circle positioning column. The bottom of the first column and the lower end of the rubber node mounting hanger outer circle positioning column are respectively fixedly connected to the two ends of the base beam, and the bottom of the base beam is fixedly connected to the end face of the machine tool docking base; a vertical wedge block side wall support bolt threaded blind hole is provided in the center of the upper end face of the base beam, and the wedge block side wall support bolt and the wedge block side wall support bolt threaded blind hole are threadedly connected; a horizontal wedge block front end face lateral positioning bolt threaded through hole is provided on the outer wall of the first column, and the wedge block front end face lateral positioning bolt passes through from the outside to the inside. The front end face of the wedge block is threaded with a lateral positioning bolt threaded through hole and is threadedly connected to it; the first column and the top of the rubber node mounting hanger outer circle positioning column are respectively provided with vertical threaded holes; the rubber node mounting hanger clamping plate includes a rubber node mounting hanger clamping plate crossbeam, a wedge block side wall clamping block and two rubber node mounting hanger clamping plate connecting bolts, the wedge block side wall clamping block is vertically fixed to the middle part of the lower end face of the rubber node mounting hanger clamping plate crossbeam, and the two are integrally formed; the two ends of the upper end face of the rubber node mounting hanger clamping plate crossbeam are respectively provided with rubber node mounting hanger clamping plate vertical through holes, the two rubber node mounting hanger clamping plate connecting bolts respectively pass through a corresponding rubber node mounting hanger clamping plate vertical through hole and are respectively threadedly connected to a corresponding vertical threaded hole on the top of the first column and the rubber node mounting hanger outer circle positioning column in a detachable manner.

[0011] The outer circle positioning column of the rubber node installation hanger is located on the side wall inside the U-shaped frame and has a transversely opened V-shaped groove. The minimum distance between the first column and the upper part of the outer circle positioning column of the rubber node installation hanger is D4>L2.

[0012] The gearbox hanger positioning device includes a gearbox hanger positioning mechanism and a gearbox hanger pressing plate. The gearbox hanger positioning mechanism includes a concave frame, lateral positioning bolts of the end beam lower cover plate and lateral positioning bolts of the gearbox hanger vertical plate. The concave frame includes an integrally formed concave frame base crossbeam and two second columns. The two second columns are vertically fixed to the two ends of the concave frame base crossbeam. The three together form a Chinese concave structure. The bottom of the concave frame base crossbeam is fixed to the end face of the machine tool docking base; a second column transverse through hole is opened on the outer side wall of each second column, and the gearbox hanger vertical plate is laterally fixed to the gearbox hanger vertical plate. The positioning bolts and the lateral positioning bolts of the end beam lower cover plate respectively pass through a corresponding second column horizontal through hole from the outside to the inside and are threadedly connected thereto; a second column vertical threaded hole is respectively opened on the top of each second column; the gear box hanger clamping plate includes a cross plate, a gear box hanger pressure block and two connecting bolts; the gear box hanger pressure block is vertically fixed to the middle part of the lower end surface of the cross plate, and the two together form a T-shaped structure, and the cross plate is provided with a cross plate vertical through hole at both ends, and the two connecting bolts respectively pass through a corresponding cross plate vertical through hole, and are threadedly connected to a corresponding second column vertical threaded hole in a detachable manner.

[0013] The distance from the gearbox hanger positioning device to the rubber node installation hanger positioning device farther away is L3, then L1≤L3≤L1+D1+D2 / 2.

[0014] The beneficial effects of the present invention are as follows: the two sets of rubber node mounting hanger positioning devices fixedly connected to the upper end of the machine tool docking base of the low-floor bogie end beam processing positioning fixture are respectively located on the left and right sides of the gear box hanger positioning device, and the distance value L3 from the gear box hanger positioning device to the rubber node mounting hanger positioning device farther away from it satisfies the dimensional relationship of L1≤L3≤L1+D1+D2 / 2. The dimensional chain parameter setting can ensure that the gear box hanger located in the middle section of the front end beam A but in an asymmetric center position can just fall into the gear box hanger positioning device. The gear box hanger seat pressure block can avoid the gear box hanging hole seat on the side of the long beam structure and be pressed from top to bottom on the upper end of the corresponding small flat plate welded to the long vertical plate group, so that the gear box hanger seat positioning mechanism can reliably fix the gear box hanger and the middle section of the front end beam A in the state of being flipped forward 90 degrees. At the same time, the lateral positioning bolts on the front end of the wedge included in the rubber node mounting hanger positioning device can be laterally pressed against the rear of the front end of the wedge in its current state, and cooperate with the transversely open V-shaped groove to limit the arc surface of the outer diameter end of the rubber node seat sleeve. Furthermore, the wedge side wall support bolts supported at the bottom of the wedge side wall plane and the wedge side wall pressure block pressed above the forward-facing wedge side wall plane jointly serve to vertically position the wedge base, thereby ensuring that the entire front end beam A is accurately and reliably fixed to the low-floor bogie end beam processing and positioning fixture of the present invention. The adjustable positioning screws facilitate assembly, disassembly, and fine-tuning of the distance, thereby reducing the operator's labor intensity during repetitive operations. The vertical pressure of the wedge side wall pressure block not only improves the positioning accuracy of the rubber node mounting hanger by the rubber node mounting hanger positioning mechanism, but also provides stress against the rotation of the boring and milling tool during the boring and milling process, giving the rubber node mounting hanger a self-locking characteristic during the boring process, thereby effectively improving processing accuracy.

[0015] The low-floor bogie end beam machining and positioning fixture of the present invention fully considers and utilizes the complex structural features of the wedge block base rubber node mounting seat sleeve and carefully selects the available reference surfaces and structural features that can be used for positioning. On this basis, the corresponding clamping structure and position relationship layout are cleverly designed when the front end beam A is tilted 90 degrees forward. Under the premise of ensuring reliable positioning of the workpiece, the thorny problem of mutual obstruction and interference between the positioning fixture and the processing position is effectively avoided, and the asymmetric, multi-bevel, special-shaped I-beam structure with multiple bends, large dimensions, and large welding deformation is achieved through one-time tightening and positioning, thereby achieving "datum unification" between the CNC machine tool processing coordinate system and the actual coordinate system of the special workpiece. Furthermore, the reference coordinate system of the positioning fixture is used to achieve effective conversion and unification between the workpiece coordinate system and the CNC machine tool machining process, laying a reliable process foundation for one-time processing of all process nodes. By utilizing the end beam processing positioning fixture of the present invention, the processing of all parts of the end beam can be completed on a set of fixtures, and the old process is completely overcome. The cumbersome and backward method that requires multiple sets of tooling, changing different clamping methods and clamping positions, and requires multiple steps to complete the processing of the workpiece. The positioning fixture makes the positioning and processing process of the front end beam A accurate and efficient, which can greatly reduce labor intensity, improve production efficiency, save the occupancy time of the machine tool, and thus improve production benefits.

[0016] In addition, the low-floor bogie end beam processing and positioning fixture of the present invention has the advantages of simple and practical structure, easy operation, low cost, and easy promotion and popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the existing front end beam when installed on a train;

[0018] Figure 2 yes Figure 1 A top view of

[0019] Figure 3 yes Figure 1 Exploded assembly diagram of

[0020] Figure 4 This is a schematic diagram of the exploded assembly of the existing front end beam after it is turned upside down;

[0021] Figure 5 It is the main view, top view and three-dimensional structural diagram of the existing rubber node installation hanger;

[0022] Figure 6 This is a three-dimensional diagram of a positioning fixture for machining the end beam of a low-floor bogie according to the present invention;

[0023] Figure 7 yes Figure 6 A top view of

[0024] Figure 8 yes Figure 6 A partial enlarged view of part I;

[0025] Figure 9 This is a front view of the rubber node installation hanger positioning device of the present invention;

[0026] Figure 10 It is a schematic diagram of the three-dimensional structure of the gear box hanger positioning device of the present invention;

[0027] Figure 11 2. This is a schematic diagram of the application of the low-floor bogie end beam processing and positioning fixture of the present invention;

[0028] Figure 12 yes Figure 11 A top view of

[0029] Figure 13 yes Figure 11 The main view;

[0030] Figure 14 yes Figure 13 Cross-section view at the AA position. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figures 6 to 10 As shown, the low-floor bogie end beam processing and positioning fixture of the present invention includes a machine tool docking base 10, two sets of rubber node mounting hanger positioning devices and a set of gear box hanger positioning devices. The two sets of rubber node mounting hanger positioning devices are respectively located on the left and right sides of the gear box hanger positioning device. The three are arranged parallel to each other and the bottoms of the three are welded and fixed to the upper end surface of the machine tool docking base 10.

[0033] The rubber node mounting hanger positioning device includes a rubber node mounting hanger positioning mechanism 8 and a rubber node mounting hanger pressing plate 9. The rubber node mounting hanger positioning mechanism 8 includes a U-shaped frame, a wedge block side wall support bolt 8-4 and a wedge block front end face lateral positioning bolt 8-5. The U-shaped frame includes an integrally formed base beam 8-1, a first column 8-2 and a rubber node mounting hanger outer circle positioning column 8-3. The bottom of the first column 8-2 and the rubber node mounting hanger outer circle positioning column 8-3 The lower ends of the two ends are respectively fixedly connected to the two ends of the base crossbeam 8-1, and the bottom of the base crossbeam 8-1 is fixedly connected to the end face of the machine tool docking base 10; the center of the upper end face of the base crossbeam 8-1 is provided with a vertical wedge block side wall support bolt threaded blind hole 8-1-1, and the wedge block side wall support bolt threaded blind hole 8-1-1 is threadedly connected; the outer side wall of the first column 8-2 is provided with a horizontal wedge block front end face lateral positioning bolt threaded through hole 8-2-1, the wedge block front end face lateral positioning bolt 8- 5 penetrates the lateral positioning bolt threaded through hole 8-2-1 on the front end surface of the wedge block from the outside to the inside and is threadedly connected thereto; the first column 8-2 and the top of the outer circle positioning column 8-3 of the rubber node mounting hanger are respectively provided with vertical threaded holes 8-6; the rubber node mounting hanger pressing plate 9 includes a rubber node mounting hanger pressing plate crossbeam 9-1, a wedge block side wall pressing block 9-2 and two rubber node mounting hanger pressing plate connecting bolts 9-3, and the wedge block side wall pressing block 9-2 is vertically fixed to the rubber node mounting hanger seat The middle part of the lower end face of the clamping plate beam 9-1, the two are integrally formed; the two ends of the upper end face of the rubber node mounting hanger clamping plate beam 9-1 are respectively provided with vertical through holes for the rubber node mounting hanger clamping plate, and the two rubber node mounting hanger clamping plate connecting bolts 9-3 respectively pass through a corresponding vertical through hole of the rubber node mounting hanger clamping plate and are respectively threadedly connected to a corresponding vertical threaded hole 8-6 on the top of the first column 8-2 and the rubber node mounting hanger outer circle positioning column 8-3 in a detachable manner.

[0034] The outer circle positioning column 8-3 of the rubber node installation hanger is located on the side wall inside the U-shaped frame and is provided with a transversely opened V-shaped groove 8-3-1. The minimum distance D4 between the first column 8-2 and the upper part of the outer circle positioning column 8-3 of the rubber node installation hanger is greater than L2.

[0035] The gearbox hanger positioning device includes a gearbox hanger positioning mechanism 11 and a gearbox hanger clamping plate 12. The gearbox hanger positioning mechanism 11 includes a concave frame, lateral positioning bolts 11-3 on the lower cover of the end beam and lateral positioning bolts 11-4 on the gearbox hanger vertical plate. The concave frame includes an integrally formed concave frame base crossbeam 11-1 and two second columns 11-2. The two second columns 11-2 are vertically fixed to the two ends of the concave frame base crossbeam 11-1, and the three together constitute a Chinese concave structure. The bottom of the concave frame base crossbeam 11-1 is fixed to the end face of the machine tool docking base 10; a second column transverse through hole 11-2-1 is provided on the outer wall of each second column 11-2, and the gearbox hanger vertical plate lateral positioning bolts 11-4 are provided. The positioning bolts 11-4 and the lateral positioning bolts 11-3 of the lower cover plate of the end beam are respectively passed through a corresponding second column horizontal through hole 11-2-1 from the outside to the inside and are threadedly connected thereto; a second column vertical threaded hole is respectively opened on the top of each second column 11-2; the gear box hanger clamping plate 12 includes a transverse plate 12-1, a gear box hanger pressure block 12-2 and two connecting bolts 12-3; the gear box hanger pressure block 12-2 is vertically fixed to the middle part of the lower end face of the transverse plate 12-1, and the two together form a T-shaped structure, and the transverse plate 12-1 is respectively provided with a transverse plate vertical through hole at both ends, and the two connecting bolts 12-3 respectively pass through a corresponding transverse plate vertical through hole and are threadedly connected to a corresponding second column vertical threaded hole in a detachable manner.

[0036] The distance from the gearbox hanger positioning device to the rubber node installation hanger positioning device farther away is L3, then L1≤L3≤L1+D1+D2 / 2.

[0037] When the low-floor bogie end beam processing and positioning fixture of the present invention is specifically applied, Figures 11 to 14 As shown, first remove the rubber node mounting hanger clamping plate 9 from the rubber node mounting hanger positioning mechanism 8, and remove the gear box hanger clamping plate 12 from the gear box hanger positioning mechanism 11, then flip the front end beam A as a whole 90 degrees so that its gear box hanging hole seat 6-3 faces upward, and then hoist the front end beam A in this posture into the low-floor bogie end beam processing and positioning fixture of the present invention.

[0038] like Figure 14As shown, the wedge block side wall support bolt 8-4 is used to support the bottom of the wedge block side wall plane 7-1-3 currently facing downward, and the arc surface of the outer diameter end of the rubber node seat sleeve 7-2 is limited by the transversely opened V-shaped groove 8-3-1, and then the wedge block front end face lateral positioning bolt 8-5 is rotated to make it press from the side behind the wedge block front end face 7-1-1 in the current state, and finally the two rubber node mounting hanger clamping plate connecting bolts 9-3 are reused to install the rubber node mounting hanger clamping plate 9 above the rubber node mounting hanger positioning mechanism 8 and the wedge block side wall clamping block 9-2 is used to press the wedge block side wall plane 7-1-3 currently facing upward downward, thereby completing the complete tightening and positioning of the rubber node mounting hanger 7 in the rubber node mounting hanger positioning device.

[0039] like Figures 11 to 13 In the posture shown, the front end beam A and its gear box hanger 6 just fall into the concave frame, and the end beam lower cover plate 1 and the gear box hanger upper cover plate 6-1 in the vertical state are both located on the concave frame base beam 11-1, and the horizontal end beam lower cover plate lateral positioning bolts 11-3 and the gear box hanger vertical plate lateral positioning bolts 11-4 on the two second columns 11-2 are respectively pressed against the corresponding end faces of the end beam lower cover plate 1 and the gear box hanger upper cover plate 6-1 from the front and rear sides; the gear box hanger clamping plate 12 is fixedly connected to the top of the two second columns 11-2 by two connecting bolts 12-3, and the gear box hanger pressure block 12-2 avoids the side wall from the side where the long beam structure is located and is pressed from top to bottom on the upper end of the corresponding small flat plate 6-2-1 welded to the long vertical plate 4, thereby completing the positioning of the gear box hanger 6 and the front end beam A by using the gear box hanger positioning mechanism 11.

[0040] After that, the machine tool docking base 10 can be fixedly connected to the CNC machine tool, and the relative position coordinates between the various components of the low-floor bogie end beam processing positioning fixture can be input into the CNC machine tool, so as to use the processing positioning fixture to establish the unity between the machine tool processing coordinate system and the factory positioning coordinate system, and then the two processes of rough boring and milling and fine boring and milling of the boring hole 7-2-1 on the rubber node seat sleeve 7-2 and the processing process of axial drilling on the gear box hanging hole seat 6-3 to form the gear box hanging seat hole 6-3-1 can be completed by using the CNC machine tool only under the premise of one clamping and positioning.

Claims

1. The low-floor bogie end beam processing and positioning fixture is characterized by: The fixture comprises a machine tool docking base (10), two sets of rubber node mounting hanger positioning devices and a set of gear box hanger positioning devices, the two sets of rubber node mounting hanger positioning devices are respectively located on the left and right sides of the gear box hanger positioning device, the three are arranged parallel to each other and the bottoms of the three are welded and fixedly connected to the upper end surface of the machine tool docking base (10); The rubber node mounting hanger positioning device comprises a rubber node mounting hanger positioning mechanism (8) and a rubber node mounting hanger pressing plate (9), the rubber node mounting hanger positioning mechanism (8) comprising a U-shaped frame, a wedge block side wall support bolt (8-4) and a wedge block front end face lateral positioning bolt (8-5), the U-shaped frame comprising an integrally formed base crossbeam (8-1), a first column (8-2) and a rubber node mounting hanger outer circle positioning column (8-3), the bottom of the first column (8-2) and the rubber node mounting hanger outer circle positioning column ( The lower ends of the first column (8-3) are respectively fixedly connected to the two ends of the base crossbeam (8-1), and the bottom of the base crossbeam (8-1) is fixedly connected to the end face of the machine tool docking base (10); a vertical wedge block side wall support bolt threaded blind hole (8-1-1) is provided in the center of the upper end face of the base crossbeam (8-1), and the wedge block side wall support bolt (8-4) is threadedly connected to the wedge block side wall support bolt threaded blind hole (8-1-1); a horizontal wedge block front end face lateral positioning bolt threaded through hole (8-2-1) is opened on the outer side wall of the first column (8-2), and the wedge block front end face lateral positioning bolt threaded through hole (8-2-1) is opened. The positioning bolt (8-5) passes through the lateral positioning bolt threaded through hole (8-2-1) on the front end surface of the wedge block from the outside to the inside and is threadedly connected thereto; the first column (8-2) and the top of the outer circle positioning column (8-3) of the rubber node mounting hanger are respectively provided with vertical threaded holes (8-6); the rubber node mounting hanger clamping plate (9) includes a rubber node mounting hanger clamping plate crossbeam (9-1), a wedge block side wall clamping block (9-2) and two rubber node mounting hanger clamping plate connecting bolts (9-3); the wedge block side wall clamping block (9-2) is vertically fixed to the rubber The middle part of the lower end surface of the node mounting hanger clamping plate crossbeam (9-1) is formed in one piece; vertical through holes for the rubber node mounting hanger clamping plate are respectively opened at both ends of the upper end surface of the rubber node mounting hanger clamping plate crossbeam (9-1); two rubber node mounting hanger clamping plate connecting bolts (9-3) respectively pass through a corresponding vertical through hole of the rubber node mounting hanger clamping plate and are respectively threadedly connected to a corresponding vertical threaded hole (8-6) on the top of the first column (8-2) and the rubber node mounting hanger outer circle positioning column (8-3) in a detachable manner.

2. The low-floor bogie end beam machining and positioning fixture according to claim 1, characterized in that: The outer circular positioning column (8-3) of the rubber node mounting hanger is located on the side wall inside the U-shaped frame and is provided with a transversely opened V-shaped groove (8-3-1). The minimum spacing value D4 between the first column (8-2) and the upper portion of the outer circular positioning column (8-3) of the rubber node mounting hanger is greater than L2, where L2 is the overall length of the rubber node mounting hanger (7).

3. The low-floor bogie end beam machining and positioning fixture according to claim 2, characterized in that: The gearbox hanger positioning device comprises a gearbox hanger positioning mechanism (11) and a gearbox hanger pressing plate (12), the gearbox hanger positioning mechanism (11) comprises a concave frame, a lateral positioning bolt (11-3) of the end beam lower cover plate and a lateral positioning bolt (11-4) of the gearbox hanger vertical plate, the concave frame comprises an integrally formed concave frame base crossbeam (11-1) and two second columns (11-2), the two second columns (11-2) are vertically fixedly connected to the two ends of the concave frame base crossbeam (11-1), and the three together form a Chinese concave structure, the bottom of the concave frame base crossbeam (11-1) is fixedly connected to the end face of the machine tool docking base (10); a second column transverse through hole (11-2-1) is opened on the outer side wall of each second column (11-2), and the gearbox hanger vertical plate side is fixedly connected to the end face of the machine tool docking base (10); a second column transverse through hole (11-2-1) is opened on the outer side wall of each second column (11-2), and the gearbox hanger vertical plate side is fixedly connected to the end face of the machine tool docking base (10); a second column transverse through hole (11-2-1) is opened on the outer side wall of each second column (11-2), and the gearbox hanger vertical plate side is fixedly connected to the end face of the machine tool docking base (10); a second column transverse through hole (11-2-1) is opened on the outer side wall of the gearbox hanger vertical plate The lateral positioning bolts (11-4) and the lateral positioning bolts (11-3) of the end beam lower cover plate respectively penetrate a corresponding second column transverse through hole (11-2-1) from the outside to the inside and are threadedly connected thereto; a second column vertical threaded hole is respectively opened on the top of each second column (11-2); the gear box hanger pressing plate (12) comprises a transverse plate (12-1), a gear box hanger pressing block (12-2) and two connecting bolts (12-3); the gear box hanger pressing block (12-2) is vertically fixed to the middle part of the lower end surface of the transverse plate (12-1), and the two together form a T-shaped structure, and the transverse plate (12-1) is respectively provided with a transverse plate vertical through hole at both ends, and the two connecting bolts (12-3) respectively penetrate a corresponding transverse plate vertical through hole and are threadedly connected to a corresponding second column vertical threaded hole in a detachable manner.

4. The low-floor bogie end beam machining and positioning fixture according to claim 3, characterized in that: Assuming that the distance between the gearbox hanger positioning device and the rubber node mounting hanger positioning device farther away is L3, then L1≤L3≤L1+(D1+D2) / 2, L1 is the length of the long crossbeam structure with an I-shaped cross section, D1 is the width of the small flat plate (6-2-1) on the side wall of the gearbox hanger vertical plate (6-2), and D2 is the length of the lower base of the right-angled trapezoid of the wedge block base (7-1).

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