A milling tool for power take-off housing casting

Abstract

The present invention relates to the technical field of mechanical processing tooling, and specifically proposes a milling tooling for a power take-off housing casting; it is used for milling the end faces of the power take-off housing at three locations: the base, the input port, and the output port; the milling tooling includes: an auxiliary bracket; two rotating shaft assemblies, which are coaxially arranged and rotatably installed on the auxiliary bracket; a reference frame, fixed between the two rotating shaft assemblies; a side clamping assembly, assembled on the reference frame; two support plate assemblies, which are relatively arranged and connected to the side clamping assemblies; and a clamping assembly, assembled on the reference frame; the tooling provided by the present invention reduces the effects of reduced clamping reliability and poor milling stability caused by changes in the position of the center of gravity in space and the distance between the milling end face and the dividing axis after switching the milling end face through the auxiliary support and cooperative locking of the auxiliary bracket, and through the comprehensive clamping and positioning of the tooling fixture, which is beneficial to improving the milling processing quality of the power take-off housing.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing tooling, and specifically proposes a milling tooling for a power take-off housing casting. Background Art

[0002] A power take-off is a device in mechanical engineering with an input and an output. The input is generally connected to the vehicle's engine or gearbox to obtain power, and the output is connected to other external devices to achieve power extraction and transmission. It can be used to drive external equipment such as pumps, compressors, generators, lawn mowers, snow blowers, etc. to meet the power requirements of external equipment.

[0003] The power take-off includes an external shell and a power transmission mechanical structure located inside the shell. The power take-off shell is usually molded in an integrated manner by casting. The power take-off shell has a base for facilitating the overall fixed installation of the power take-off, and also includes an input port and an output port. After the power take-off shell is cast, the casting surface is usually rough and the flatness accuracy is low. In order to improve the stability and reliability of the overall installation of the power take-off, and to ensure the assembly accuracy required for the input port and the output port to dock with the outside, at least the installation end face of the power take-off shell base and the docking surfaces of the two docking ports of the input port and the output port need to be milled.

[0004] Under the existing processing technology, the power take-off housing can be milled by a professional milling machine. In order to ensure the efficiency of milling, the milling machine used is mostly a multi-axis structure, so that the power take-off housing can be clamped once and then continuously milled. The power take-off housing is fixed in a specially designed fixture, and the fixture is fixed on the rotating shaft of the machine tool that drives the power take-off housing to change its face. Although the above processing method improves the processing efficiency, it still has the following problems: (1) In order to realize the avoidance milling of the three end faces of the base, input port and output port one by one, the existing fixture is usually simple in design, and its clamping structure is basically concentrated at the two ends of the machine tool shaft. During the continuous face changing process, the entire center of gravity position of the power take-off housing changes in space, affecting the reliability of the fixture clamping.

[0005] (2) During the machining process, the position of the machine tool shaft that drives the fixture to rotate remains unchanged, but the distance between the end face to be milled and the shaft changes after continuous face changing. If the position of the machine tool shaft is locked, the larger the relative distance, the lower the machining stability of the end face to be milled, which affects the milling quality. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a milling tool for a power take-off housing casting, which is used to solve the problems mentioned in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a milling tool for a power take-off housing casting, which is used to mill the end faces of the base, input port and output port of the power take-off housing; the milling tool comprises: an auxiliary bracket; two rotating shaft assemblies, which are coaxially arranged and rotatably mounted on the auxiliary bracket, and are both equipped with a locking assembly that limits the rotation of the rotating shaft assembly in cooperation with the auxiliary bracket; a reference frame, which is fixed between the two rotating shaft assemblies and is used to position the base; a side clamp assembly, which is assembled on the reference frame and is used to cooperate with the reference frame to perform axial side clamp positioning on the power take-off housing; two support plate assemblies, which are arranged relatively to each other Connected to the side clamp assembly; when performing axial side clamp positioning, the side clamp assembly indirectly drives the two pallet assemblies to clamp the base between the reference frame and the two pallet assemblies; and the clamping assembly, assembled on the reference frame, is used to clamp and position the power take-off housing in a clamping direction perpendicular to the side clamp structure; the two rotating shaft assemblies drive the power take-off housing to rotate synchronously with the reference frame, switching the base, input port or output port as the end face to be milled, and locking it through the locking assembly. When the base is in a horizontal state, the base is clamped in contact with the two pallet assemblies. When the base is in a vertical state, the side clamp assembly drives the two pallet assemblies to separate from the end face of the base.

[0008] Preferably, the auxiliary bracket includes a U-shaped frame, and locking blocks are relatively fixed at both ends of the U-shaped frame; two rotating shaft assemblies are assembled on the two locking blocks in a one-to-one correspondence; the rotating shaft assembly includes a switching rotating shaft and a secondary rotating shaft arranged coaxially with the switching rotating shaft, the secondary rotating shaft is rotatably installed on the locking block, and the end of the secondary rotating shaft extending into the U-shaped frame is fixed with a coupling frame, the reference frame is fixed between the two coupling frames, and a fixing seat is fixed between the switching rotating shaft and the other end of the secondary rotating shaft, and a locking component that cooperates with the locking block is assembled on the fixing seat. When the power take-off housing is switched for milling end face, the locking component and the locking block can cooperate to lock the switching rotating shaft on the auxiliary bracket.

[0009] Preferably, the reference frame is provided with a side clamping portion for clamping the side wall on the side where the input port or the output port is located, and the side clamping assembly is used to cooperate with the side clamping portion to clamp the axial end on the other side of the power take-off housing; the side clamping assembly includes a travel bar that is driven by a sliding fit and installed on the reference frame, and a side clamping plate is slidingly installed on the travel bar, and the side clamping plate and the travel bar are connected by an elastic member; the two support plate assemblies are symmetrically connected to the travel bar near the two ends.

[0010] Preferably, two guide holes corresponding to the two support plate assemblies are symmetrically provided on the reference frame, and the guide holes are V-shaped; the support plate assembly includes a sliding pin installed on the travel bar in a sliding direction perpendicular to the sliding direction of the travel bar, the sliding pin passes through the corresponding guide hole, and the sliding pin moves along the guide hole, and a support plate is fixed to one end of the sliding pin passing through the guide hole, and a hinge seat slider is installed on the support plate in a sliding manner along its length direction, and a connecting rod is hinged between the hinge seat slider and the reference frame.

[0011] Preferably, the clamping assembly includes two elastic bases mounted on the reference frame for relative sliding along a direction perpendicular to the side clamping direction of the side clamping assembly, and the two elastic bases are respectively equipped with clamping plates, which are arranged opposite to each other; the power take-off housing is clamped between the two clamping plates.

[0012] Preferably, the locking block is provided with four locking holes evenly distributed around the secondary rotating shaft, and the central axis of the locking hole is located in the radial direction of the secondary rotating shaft; the locking component includes a cylinder fixed on a fixed seat and a locking pin fixed on the output end of the cylinder, and the locking pin matches the locking hole.

[0013] Preferably, the auxiliary bracket also includes a positioning sleeve and a plug-in column that can be plugged into the positioning sleeve, and the plug-in direction of the plug-in column relative to the positioning sleeve is perpendicular to the axial direction of the switching shaft; the plug-in column is fixed on the outer side wall of the U-shaped frame.

[0014] Preferably, the elastic base includes a sliding base slidably mounted on the reference frame, a plurality of guide columns are fixed on the sliding base, a clamping plate is slidably mounted on the plurality of guide columns, an adaptive spring is sleeved on the guide column, and both ends of the adaptive spring are respectively fixed on the clamping plate and the sliding base.

[0015] Preferably, the clamping assembly further comprises a bidirectional lead screw rotatably mounted between the two coupling frames, and the two clamping plates are correspondingly threadedly connected to the two threaded sections of the bidirectional lead screw.

[0016] The above technical solution has the following advantages or beneficial effects: The present invention provides a milling tool for a power take-off housing casting, which is composed of an auxiliary bracket and a tool fixture that rotates with the auxiliary bracket. On the one hand, the auxiliary bracket strengthens the rotational support of the tool fixture. On the other hand, by cooperating with the locking component provided in the tool fixture, the tool fixture and the auxiliary bracket can be locked together, and the position locking state can be further enhanced in cooperation with the indexing axis to achieve stable positioning milling. In addition, compared with the existing fixture, the clamping structure design and clamping method only clamp the power take-off housing at the position near the two ends of the indexing axis, and the tool fixture is provided with a multi-angle and multi-dimensional clamping structure, which greatly improves the stability during milling processing; through the auxiliary support and cooperative locking of the auxiliary bracket, and through the comprehensive clamping and positioning of the tool fixture, the effect of reduced clamping reliability and poor milling stability caused by the change in the position of the center of gravity in space after switching the milling end face and the change in the distance of the milling end face from the indexing axis is weakened, which is conducive to improving the milling processing quality of the power take-off housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention and its features, configurations and advantages will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which like reference numerals indicate like parts throughout the drawings, which are not drawn to scale, with emphasis placed on illustrating the subject matter of the present invention.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a milling tool for a power take-off housing casting provided by the present invention.

[0019] Figure 2 It is a top view of a milling tool for a power take-off housing casting provided by the present invention.

[0020] Figure 3 This is a three-dimensional structural diagram of the power take-off housing.

[0021] Figure 4 This is a working state diagram of a power take-off housing casting milling tool provided by the present invention at a first viewing angle.

[0022] Figure 5 This is a working state diagram of a power take-off housing casting milling tool provided by the present invention from a second perspective.

[0023] Figure 6 This is a main view of a power take-off housing casting milling tool provided by the present invention in a working state.

[0024] Figure 7 The figure is a side view of a milling tool for a power take-off housing casting provided by the present invention in a working state.

[0025] Figure 8It is a three-dimensional structural diagram of the assembly of two rotating shaft components and auxiliary brackets.

[0026] Figure 9 It is a three-dimensional structural diagram of the assembly of the side clamp assembly, the pallet assembly and the reference frame.

[0027] Figure 10 This is a schematic diagram of the installation of the worktable spindle and milling tooling structure.

[0028] In the figure: 1. Auxiliary bracket; 11. Positioning sleeve; 12. Plug-in column; 13. U-shaped frame; 14. Locking block; 141. Locking hole; 2. Rotating shaft assembly; 21. Switching shaft; 22. Fixing seat; 23. Auxiliary rotating shaft; 24. Locking component; 241. Cylinder; 242. Locking pin; 25. Coupling frame; 3. Reference frame; 31. Side clamping part; 32. Guide hole; 4. Side clamping assembly; 41. Side clamping cylinder; 42. Stroke bar; 421. Slide rail; 43. Side clamping plate; 44. Guide rod ;45. Clamping spring;5. Support plate assembly;51. Sliding pin;52. Connecting rod;53. Hinge seat slider;54. Support plate;6. Clamping assembly;61. Elastic base;611. Sliding base;612. Guide column;613. Adaptive spring;62. Clamping plate;621. Ball;63. Bidirectional screw;7. Power take-off housing;71. Base;72. Input port;73. Output port;81. Workbench spindle;82. Rotating mounting seat;83. Indexing shaft;84. Coupling. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] A milling tool for casting a power take-off housing, used for Figure 3The end faces of the base 71, input port 72 and output port 73 of the power take-off housing 7 shown are milled. The power take-off housing 7 is a cast part. The milling tool is used to cooperate with the existing milling machine to mill the power take-off housing 7 shown in the figure. It should be noted that the milling machine here is preferably a horizontal milling machine. In addition to including a tool spindle for installing a milling cutter, the horizontal milling machine also includes a worktable spindle 81 for fixing and installing a workpiece fixture to cooperate with milling. The tool spindle can move in the space along the X, Y, and Z axes. The worktable spindle 81 is also provided with a dividing shaft 83 that is mounted and rotated perpendicularly to the worktable spindle 81. The milling tool provided by the present invention is specifically installed on the dividing shaft 83. During the milling process, the milling tool can be driven by the dividing shaft 83 of the machine tool to rotate together with the power take-off housing 7 to realize the milling switching of the three end faces. The above-mentioned horizontal milling machine with multiple axes is an existing machine tool equipment.

[0032] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 and Figure 10 As shown, the milling tool includes an auxiliary bracket 1; the auxiliary bracket 1 includes a positioning sleeve 11, a connecting column 12 and a U-shaped frame 13; the positioning sleeve 11 has a square hole. In this embodiment, the positioning sleeve 11 is fixed to the rotating mounting seat 82 of the machine tool indexing shaft 83 by screws, and the center axis of the hole of the positioning sleeve 11 after fixation coincides with the center axis of the worktable spindle 81 of the machine tool; the connecting column 12 is a square shaft structure that matches the hole of the positioning sleeve 11, and the connecting column 12 is inserted into the positioning sleeve 11. The U-shaped frame 13 is a U-shaped plate structure, and the end of the connecting column 12 located outside the positioning sleeve 11 is welded to the side walls centered at the opposite ends of the U-shaped frame 13, and the welding position of the connecting column 12 is located outside the U-shaped recess of the U-shaped frame 13.

[0033] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8As shown, the milling fixture also includes a fixture for clamping the power take-off housing 7 to facilitate stable milling. The fixture is fixedly mounted on the indexing shaft 83 of the machine tool, and the indexing shaft 83 drives the power take-off housing 7 and the fixture to rotate as a whole to switch the milling end face. It should be noted that the indexing shaft 83 of the machine tool itself has a position self-locking function. In this embodiment, the fixture is also rotatably mounted on the U-shaped frame 13. The fixture includes two rotating shaft assemblies 2, a reference frame 3, a side clamp assembly 4, a support plate assembly 5, and a clamping assembly 6. It should be noted that the following description of the assembly and connection methods of the various component structures in the fixture is based on the reference frame 3 being in a horizontal state. The two rotating shaft assemblies 2 are coaxially arranged opposite to each other, and locking blocks 14 are integrally formed at both ends of the U-shaped frame 13; the two rotating shaft assemblies 2 are assembled on the two locking blocks 14 in a one-to-one manner; the rotating shaft assembly 2 includes a switching rotating shaft 21 and a secondary rotating shaft 23 arranged coaxially with the switching rotating shaft 21, the secondary rotating shaft 23 is rotatably installed on the locking block 14, and a coupling frame 25 is welded on one end of the secondary rotating shaft 23 extending into the frame of the U-shaped frame 13, and a fixing seat 22 is welded between the switching rotating shaft 21 and the other end of the secondary rotating shaft 23, and a locking component 24 that cooperates with the locking block 14 is assembled on the fixing seat 22. The locking component 24 and the cooperating locking block 14 constitute a locking assembly. The locking block 14 has four locking holes 141 evenly distributed around the secondary shaft 23. The central axes of the locking holes 141 are radially aligned with the secondary shaft 23. This means the four locking holes 141 form a cross-shaped structure, with the intersection located at the central axis of the secondary shaft 23's through-hole on the locking block 14. The locking component 24 includes a cylinder 241 bolted to the mounting base 22 and a locking pin 242 welded to the output end of the cylinder 241. The locking pin 242 mates with the locking holes 141. When the power take-off housing 7 is switched to milling end faces, the locking component 24 and the locking block 14 cooperate to lock the switching shaft 21 to the auxiliary bracket 1.

[0034] It should be noted that the indexing shaft 83 is a two-section structure consisting of two shaft segments, so that the two switching shafts 21 are fixed to the two shaft segments respectively. The two shaft segments are rotatably mounted on the rotating mounting seat 82, and one of the shaft segments is fixedly connected to the driving end of the indexing shaft 83. When the milling tool provided by the present invention is installed on the worktable spindle 81 of the machine tool, the tool fixture can be pre-assembled on the U-shaped frame 13 through the two rotating shaft assemblies 2, and the positioning sleeve 11 is also pre-fixed on the rotating mounting seat of the indexing shaft 83. 82, during installation, the plug-in column 12 is inserted into the positioning sleeve 11 and slidably adjusted so that the two switching shafts 21 are aligned with the two shaft sections of the indexing shaft 83, and the switching shaft 21 and the shaft section can be fixedly connected by a two-half coupling 84 that is separated in half; here, the plug-in column 12 and the positioning sleeve 11 are directly plugged in and matched, and the initial positioning of the installation can be performed to facilitate the assembly operation, and the plug-in method is slidingly adjustable, which is also beneficial to the adjustment and alignment between the switching shaft 21 and the shaft section and facilitates the installation of the coupling 84.

[0035] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 9 As shown, a reference frame 3 for positioning the base 71 of the power take-off housing 7 is fixedly connected between the bottom ends of the two coupling frames 25 by bolts; the reference frame 3 is a rectangular frame structure with a notch in the center of one side, and side clamping parts 31 are provided at both ends of the side where the notch is provided on the reference frame 3. The side clamping parts 31 are used to clamp the side wall on the side where the input port 72 or output port 73 of the power take-off housing 7 is located. A side clamping assembly 4 is assembled on the side opposite to the side where the notch is provided on the reference frame 3, which is used to cooperate with the two side clamping parts 31 to perform axial side clamping and positioning of the power take-off housing 7; the side clamping assembly 4 includes a side clamping cylinder 41 welded to the reference frame 3 by a fixing plate, and a stroke bar 42 is fixed to the output end of the side clamping cylinder 41 by screws, and a sliding groove is provided on the reference frame 3 to cooperate with the stroke bar 42. The sliding groove is perpendicular to the central axis of the switching shaft 21, and the stroke bar 42 is slidably installed in the sliding groove. The stroke bar 42 slides on Two guide rods 44 are dynamically installed axially along the sliding direction of the travel bar 42, and a side clamping plate 43 is welded between the ends of the two guide rods 44 close to the side clamping part 31. A clamping spring 45 is sleeved on the guide rod 44, and the two ends of the clamping spring 45 are respectively welded to the travel bar 42 and the side clamping plate 43; the side clamping plate 43 is an L-plate structure, and the plate portion of the side clamping plate 43 that is perpendicular to the guide rod 44 is used for clamping contact with the axial side end face of the power take-off housing 7, and the other plate portion of the side clamping plate 43 is used for contacting the end face of the base 71 of the power take-off housing 7.

[0036] like Figure 1 、 Figure 3 、 Figure 5、 Figure 6 、 Figure 7 and Figure 9 As shown, two symmetrically arranged slide rails 421 are provided on the travel bar 42, and both slide rails 421 extend to the end along the length direction of the travel bar 42; a support plate assembly 5 is correspondingly assembled on the two slide rails 421, and two guide holes 32 corresponding to the two support plate assemblies 5 are symmetrically provided on the reference frame 3, and the guide holes 32 are V-shaped; the support plate assembly 5 includes a sliding pin 51 slidably installed in the slide rail 421, the sliding pin 51 passes through the corresponding guide hole 32, and the sliding pin 51 moves along the guide hole 32, and a supporting plate 54 is welded to one end of the sliding pin 51 passing through the guide hole 32, and a hinge seat slider 53 is slidably installed on the supporting plate 54 along its length direction, and a connecting rod 52 is hinged between the hinge seat slider 53 and the reference frame 3; the supporting surface of the supporting plate 54 that contacts the base 71 is covered and fixed with a rubber layer, so that the gap between the supporting plate 54 and the reference frame 3 is slightly smaller than the thickness of the base 71 of the power take-off housing 7

[0037] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As shown, the reference frame 3 is equipped with a clamping assembly 6 for clamping and positioning the power take-off housing 7 in a clamping direction perpendicular to the side clamping structure; the clamping assembly 6 includes two elastic bases 61 arranged horizontally opposite to each other, and the reference frame 3 is provided with two slide grooves corresponding to the two elastic bases 61, and the two slide grooves are distributed one-to-one on the two side edges of the reference frame 3 adjacent to the side where the notch is located, and the two elastic bases 61 are respectively equipped with clamping plates 62, and the two clamping plates 62 are arranged horizontally opposite to each other; the elastic base 61 includes a sliding base 611 slidably installed in the slide groove, and the sliding base Two guide posts 612 are welded to the upper end of 611, and the clamping plate 62 is slidably mounted on these two guide posts 612. Adaptive springs 613 are mounted on the guide posts 612, and the ends of the adaptive springs 613 are welded to the sliding base 611 and the clamping plate 62, respectively. The clamping plate 62 matches the outer contour of the power take-off housing 7. To address the problem of poor clamping due to the rough or uneven surface of the casting of the power take-off housing 7, the clamping side of the clamping plate 62 is evenly embedded with ball bearings 621. The ball bearings 621 provide multi-point clamping contact between the side clamping plate 43 and the outer wall of the power take-off housing 7. A bidirectional lead screw 63 is rotatably mounted on the two coupling frames 25 via bearings. The two clamping plates 62 are threadedly connected to the two threaded segments of the bidirectional lead screw 63.

[0038] The present invention provides a milling tool for a power take-off housing casting. The following describes the milling process of the power take-off housing 7: first, the tooling fixture is driven to rotate by the dividing shaft 83 so that the reference frame 3 is in a horizontal state with the front side facing up, and then the two cylinders 241 drive the locking pin 242 so that the locking pin 242 is inserted into the locking hole 141. Through the locking cooperation between the locking component 24 and the locking block 14, the dividing shaft 83 locks the position of the tooling fixture while further locking the tooling fixture relative to the auxiliary bracket 1.

[0039] Next, the power take-off housing 7 is passed through the reference frame 3 and placed on the reference frame 3. The side clamping cylinder 41 is then started, so that the stroke bar 42 slides toward the direction close to the power take-off housing 7. The side clamping plate 43 pushes the power take-off housing 7 to move horizontally to a state where one axial end contacts the two side clamping parts 31. As the side clamping plate 43 continues to move, the power take-off housing 7 is clamped between the side clamping plate 43 and the two side clamping parts 31 under the elastic force of the clamping spring 45, and the axial ends of the power take-off housing 7 are fixed with the side clamps. During the movement of the stroke bar 42, the stroke bar 42 drives the two sliding pins 51 to move along the guide hole 32, and the two supporting plates 54 move toward each other, so that the base 71 of the power take-off housing 7 enters the gap between the supporting plate 54 and the reference frame 3, and the base 71 is clamped between the reference frame 3 and the two supporting plates 54. In this embodiment, when the sliding pin 51 moves to the turning point of the V-shaped guide hole 32, the two supporting plates 54 are closest to each other, and the clamping contact surface between them and the base 71 is the largest, achieving the best clamping effect. In addition, when the end face of the base 71 of the power take-off housing 7 is milled, it is naturally necessary to completely expose the end face of the base 71. At this time, the side clamp cylinder 41 can be started again, so that the stroke bar 42 moves further toward the power take-off housing 7, and the side clamp spring is further compressed. The side clamp plate 43 still maintains the side clamping state of the power take-off housing 7, but the stroke bar 42 drives the two sliding pins 51 to move further along the guide hole 32, so that the distance between the two support plates 54 gradually opens and disengages from the base 71, so that the end face of the base 71 is completely exposed.

[0040] Subsequently, by manually rotating the bidirectional screw 63, the two clamping plates 62 are driven to slide toward each other. With the cooperation of the two elastic bases 61, the clamping plates 62 are adaptively clamped to the power take-off housing 7 through multi-point contact via the ball bearings 621. The cooperation of the two clamping plates 62 clamps the power take-off housing 7 in a direction perpendicular to its axial direction and parallel to the base 71, and further clamps it in a direction perpendicular to the base 71. At this point, the power take-off housing 7 is fixedly clamped by the fixture. Compared to existing fixtures, which only clamp the power take-off housing 7 near the ends of the indexing shaft 83, the fixture provided by the present invention can fully clamp the power take-off housing 7 from multiple angles and dimensions, greatly improving the stability of the power take-off housing 7 during milling.

[0041] After the fixing and clamping of the power take-off housing 7 is completed, milling can be carried out. During processing, since the base 71 is in an upward state when the power take-off housing 7 is fixed, the input port 72 or the output port 73 can be milled first, depending on the clamping state of the axial ends. Figure 7 In the clamping state shown, the three end faces of the input port 72, the base 71 and the output port 73 are processed in sequence. During processing, the indexing shaft 83 is rotated and switched so that the port to be processed is rotated to face the milling cutter spindle, and then the milling process is performed. It should be added that before the rotation switching is performed by the indexing shaft 83, the locking pin 242 is pulled out from the locking hole 141. After the rotation switching is completed, the locking pin 242 is inserted into the corresponding locking hole 141 again to maintain the matching locking state with the auxiliary bracket 1; in addition, when the end face of the base 71 is milled, the two support plates 54 move away from the end face of the base 71 so that the end face of the base 71 is completely exposed. When the input port 72 and the output port 73 are milled, the two support plates 54 and the reference frame 3 maintain a clamping state with the base 71 to ensure the stability of the milling process.

[0042] After completing the milling of the three end faces, loosen the fixture and take out the power take-off housing 7.

[0043] The present invention provides a milling tool for a power take-off housing casting, which is composed of an auxiliary bracket 1 and a tool fixture that rotates with the auxiliary bracket 1. On the one hand, the auxiliary bracket 1 strengthens the rotational support of the tool fixture. On the other hand, by cooperating with the locking component 24 provided in the tool fixture, the tool fixture and the auxiliary bracket 1 can be locked together, and can cooperate with the indexing shaft 83 to further enhance the position locking state and achieve stable positioning milling. In addition, compared with the existing fixture, the clamping structure design and clamping method only clamp the power take-off housing 7 at the positions near the two ends of the indexing shaft 83. The tool fixture is provided with a multi-angle and multi-dimensional clamping structure, which greatly improves the stability during milling processing; through the auxiliary support and cooperative locking of the auxiliary bracket 1, and through the comprehensive clamping and positioning of the tool fixture, the clamping reliability is reduced and the milling stability is poor due to the change in the position of the center of gravity in space after switching the milling end face and the change in the distance of the milling end face from the indexing shaft 83. This is conducive to improving the milling processing quality of the power take-off housing 7.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A milling tool for a power take-off housing casting, used for milling the end faces of the base, input port and output port of the power take-off housing; characterized in that: Milling tooling includes: Auxiliary bracket; Two rotating shaft assemblies are coaxially arranged relative to each other and rotatably mounted on the auxiliary bracket, and both are equipped with locking assemblies for limiting the rotation of the rotating shaft assemblies in cooperation with the auxiliary bracket; A reference frame, fixed between the two rotating shaft assemblies, for positioning the base; A side clamp assembly, mounted on the reference frame, for cooperating with the reference frame to perform axial side clamp positioning on the power take-off housing; Two support plate assemblies are arranged opposite to each other and connected to the side clamp assembly; when performing axial side clamp positioning, the side clamp assembly indirectly drives the two support plate assemblies to clamp the base between the reference frame and the two support plate assemblies; and a clamping assembly, mounted on the reference frame, for clamping and positioning the power take-off housing in a clamping direction perpendicular to the side clamping structure; The two rotating shaft assemblies drive the power take-off housing to rotate synchronously with the reference frame, switch the base, the input port or the output port as the end face to be milled, and lock it through the locking assembly. When the base is in a horizontal state, the base is clamped in contact with the two support plate assemblies. When the base is in a vertical state, the side clamp assembly drives the two support plate assemblies to separate from the end face of the base.

2. A milling tool for a power take-off housing casting according to claim 1, characterized in that: The auxiliary bracket includes a U-shaped frame, and locking blocks are relatively fixed at both ends of the U-shaped frame; the two rotating shaft assemblies are assembled on the two locking blocks in a one-to-one manner; the rotating shaft assembly includes a switching rotating shaft and a secondary rotating shaft arranged coaxially with the switching rotating shaft, and the secondary rotating shaft is rotatably installed on the locking block, and the end of the secondary rotating shaft extending into the U-shaped frame is fixed with a coupling frame, the reference frame is fixed between the two coupling frames, and a fixing seat is fixed between the switching rotating shaft and the other end of the secondary rotating shaft, and a locking component cooperating with the locking block is assembled on the fixing seat. When the power take-off housing is switched for milling end face, the locking component and the locking block can cooperate to lock the switching rotating shaft on the auxiliary bracket.

3. The milling tool for a power take-off housing casting according to claim 1, characterized in that: The reference frame is provided with a side clamping portion for clamping and contacting the side wall on the side where the input port or the output port is located, and the side clamping assembly is used to cooperate with the side clamping portion to clamp the axial end of the other side of the power take-off housing; the side clamping assembly includes a travel bar driven by a sliding fit installed on the reference frame, and a side clamping plate is slidingly installed on the travel bar, and the side clamping plate and the travel bar are connected by an elastic member; the two support plate assemblies are symmetrically connected to the travel bar near the two ends.

4. A milling tool for a power take-off housing casting according to claim 3, characterized in that: Two guide holes corresponding to the two support plate assemblies are symmetrically provided on the reference frame, and the guide holes are V-shaped; the support plate assembly includes a sliding pin installed on the travel bar in a sliding direction perpendicular to the sliding direction of the travel bar, the sliding pin passes through the corresponding guide hole, and the sliding pin moves along the guide hole, a supporting plate is fixed to one end of the sliding pin passing through the guide hole, a hinge seat slider is installed on the support plate in a sliding manner along its length direction, and a connecting rod is hinged between the hinge seat slider and the reference frame.

5. The milling tool for a power take-off housing casting according to claim 2, characterized in that: The clamping assembly includes two elastic bases mounted on the reference frame for relative sliding along a direction perpendicular to the side clamping direction of the side clamping assembly. The two elastic bases are respectively equipped with clamping plates, and the two clamping plates are arranged opposite to each other; the power take-off housing is clamped between the two clamping plates.

6. The milling tool for a power take-off housing casting according to claim 2, characterized in that: The locking block is provided with four locking holes evenly distributed around the circumference of the secondary rotating shaft, and the central axis of the locking hole is located in the radial direction of the secondary rotating shaft; the locking component includes a cylinder fixed on the fixing seat and a locking pin fixed at the output end of the cylinder, and the locking pin matches the locking hole.

7. The milling tool for a power take-off housing casting according to claim 2, characterized in that: The auxiliary bracket also includes a positioning sleeve and a plug-in column that can be plugged into the positioning sleeve. The plug-in direction of the plug-in column relative to the positioning sleeve is perpendicular to the axial direction of the switching shaft; the plug-in column is fixed to the outer side wall of the U-shaped frame.

8. The milling tool for a power take-off housing casting according to claim 5, characterized in that: The elastic base includes a sliding base slidably mounted on the reference frame, a plurality of guide columns are fixed on the sliding base, the clamping plate is slidably mounted on the plurality of guide columns, an adaptive spring is sleeved on the guide column, and both ends of the adaptive spring are respectively fixed on the clamping plate and the sliding base.

9. The milling tool for a power take-off housing casting according to claim 5, characterized in that: The clamping assembly further comprises a bidirectional lead screw rotatably mounted between the two coupling frames, and the two clamping plates are correspondingly threadedly connected to the two threaded sections of the bidirectional lead screw.

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