Power takeoff shell casting milling tool

Abstract

The invention relates to the technical field of machining tools, and particularly provides a power takeoff shell casting milling tool. The milling device is used for milling the end surfaces of a base, an input port and an output port of the power takeoff shell; the milling tool comprises an auxiliary support; the two rotating shaft assemblies are coaxially and oppositely arranged and rotationally mounted on the auxiliary bracket; the reference frame is fixed between the two rotating shaft assemblies; the side clamping assembly is assembled on the reference frame; the two supporting plate assemblies are oppositely arranged and connected to the side clamping assemblies; the holding and clamping assembly is assembled on the reference frame; according to the tool provided by the invention, through auxiliary supporting and matched locking of the auxiliary bracket and comprehensive clamping and positioning of the tool clamp, the effects that the clamping reliability is reduced and the milling stability is poor due to the position change of the gravity center in the space and the change of the distance between the milling end face and the indexing shaft after the milling end face is switched are weakened; and the milling quality of the power takeoff shell can be improved.

Description

Technical Field

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

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

[0003] The power take-off includes an external housing and a power transmission mechanical structure located inside the housing. The power take-off housing is usually integrally formed by casting. The power take-off housing 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 housing is cast and formed, the surface of the casting is usually rough and the flatness accuracy is low. In order to improve the stable reliability of the overall installation of the power take-off and ensure the assembly accuracy required for the docking of the input port and the output port with the outside, at least the installation end face of the base of the power take-off housing and the docking faces of the two docking ports of the input port and the input port need to be milled.

[0004] Under the existing processing technology, for the power take-off housing, a professional milling machine tool can be used for milling. In order to ensure the milling efficiency, most of the used milling machine tools are multi-axis structures, so as to facilitate continuous face-changing milling of the power take-off housing after a single clamping. 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 faces; although the above processing method improves the processing efficiency, there are still the following problems: (1) In order to realize the step-by-step avoidance milling of the three end faces of the base, the input port and the output port, the existing fixtures are usually simply designed, and their clamping structures are basically concentrated at both ends of the rotating shaft of the machine tool. 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 processing, the position of the rotating shaft of the machine tool that drives the fixture to rotate remains unchanged, but the distance between the end face to be milled and the rotating shaft changes after continuous face-changing. Only relying on the position locking of the rotating shaft of the machine tool itself, the greater the relative distance, the lower the processing stability of the end face to be milled, affecting the milling quality. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a milling tooling for a power take-off housing casting to solve the problems mentioned in the above background art.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A milling tooling 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 tooling includes: an auxiliary bracket; two rotating shaft assemblies, which are coaxially and oppositely arranged and rotatably installed on the auxiliary bracket, and locking assemblies for restricting the rotation of the rotating shaft assemblies are arranged in cooperation between each of them and the auxiliary bracket; a reference frame, which is fixed between the two rotating shaft assemblies and is used to position the base; a side clamping assembly, which is assembled on the reference frame and is used to axially side-clamp and position the power take-off housing in cooperation with the reference frame; two support plate assemblies, which are relatively arranged and connected to the side clamping assembly; when performing axial side-clamping positioning, the side clamping 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, which is assembled on the reference frame and is used to clamp and position the power take-off housing in a direction perpendicular to the clamping direction of 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, input port, or 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 in clamping contact with the two support plate assemblies. When the base is in a vertical state, the side clamping assembly drives the two support plate 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; the two rotating shaft assemblies are respectively assembled on the two locking blocks; 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 through the locking block. One end of the secondary rotating shaft extending into the U-shaped frame is fixed with a connecting shaft frame, and the reference frame is fixed between the two connecting shaft frames. A fixed 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 fixed seat. When switching the end face to be milled of the power take-off housing, the locking component can cooperate with the locking block to lock the switching rotating shaft on the auxiliary bracket.

[0009] Preferably, a side clamping portion for clamping and contacting the side wall where the input port or output port is located is provided on the reference frame, and the side clamping assembly is used to clamp the other axial end of the power take-off housing in cooperation with the side clamping portion; the side clamping assembly includes a travel bar slidably and drivingly installed on the reference frame, a side clamping plate is slidably 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 positions near both ends of the travel bar.

[0010] Preferably, two guiding holes corresponding to and cooperating with the two pallet assemblies are symmetrically formed in the reference frame, and the guiding holes are V-shaped; the pallet assembly includes a sliding pin slidably and fittingly mounted on the travel bar along a direction perpendicular to the sliding direction of the travel bar, the sliding pin penetrates through the corresponding guiding hole, and the sliding pin moves along the guiding hole. A supporting plate is fixed to one end of the sliding pin passing through the guiding hole. A hinge block slider is slidably and fittingly mounted on the supporting plate along the length direction thereof. A connecting rod is hinged between the hinge block slider and the reference frame.

[0011] Preferably, the clamping assembly includes two elastic bases slidably mounted on the reference frame relatively along a direction perpendicular to the clamping direction of the side clamping assembly. Clamping plates are correspondingly assembled on the two elastic bases, and the two clamping plates are arranged oppositely; the power take-off housing is clamped between the two clamping plates.

[0012] Preferably, four locking holes are circumferentially and uniformly formed in the locking block around the secondary rotating shaft, and the central axis of the locking hole is located on the radial direction of the secondary rotating shaft; the locking component includes a cylinder fixed on the fixed seat and a locking pin fixed to the output end of the cylinder, and the locking pin is matched with the locking hole.

[0013] Preferably, the auxiliary bracket further includes a positioning socket and a plug column that can be fittingly inserted into the positioning socket. The inserting direction of the plug column relative to the positioning socket is perpendicular to the axial direction of the switching rotating shaft; the plug column is fixed to the outer side wall of the frame of the U-shaped frame.

[0014] Preferably, the elastic base includes a sliding base slidably mounted on the reference frame. A plurality of guide posts are fixed to the sliding base. The clamping plate is slidably mounted on the plurality of guide posts. An adaptive spring is sleeved on the guide post, and two ends of the adaptive spring are respectively fixed to the clamping plate and the sliding base.

[0015] Preferably, the clamping assembly further includes a bidirectional lead screw rotatably mounted between the two connecting shaft frames. 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 tooling for a power take-off housing casting, which is composed of an auxiliary bracket and a tooling fixture rotatably matched with the auxiliary bracket. On the one hand, the auxiliary bracket strengthens the rotational support for the tooling fixture. On the other hand, by cooperating with the locking components provided in the tooling fixture, the cooperation locking between the tooling fixture and the auxiliary bracket can be achieved, and the position locking state can be further enhanced in cooperation with the indexing shaft to achieve stable positioning milling. In addition, compared with the existing fixtures, the clamping structure design and clamping method only clamp the power take-off housing at positions close to both ends of the indexing shaft. The tooling fixture is provided with multi-angle and multi-dimensional clamping structures, greatly improving the stability during milling processing; through the auxiliary support and cooperation locking of the auxiliary bracket, and through the comprehensive clamping and positioning of the tooling fixture, the effects of reduced clamping reliability and poor milling stability caused by the change in the position of the center of gravity in space and the change in the distance between the milling end face and the indexing shaft after switching the milling end face are weakened, which is beneficial to improving the milling processing quality of the power take-off housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings, the present invention and its features, shapes, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the emphasis is on showing the gist of the present invention.

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

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

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

[0021] Figure 4 FIG. is a working state diagram of a milling tooling for a power take-off housing casting provided by the present invention from the first perspective.

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

[0023] Figure 6 FIG. is a front view of a milling tooling for a power take-off housing casting provided by the present invention in the working state.

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

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

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

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

[0028] In the figure: 1. Auxiliary bracket; 11. Positioning socket; 12. Plug column; 13. U-shaped frame; 14. Locking block; 141. Locking hole; 2. Rotating shaft component; 21. Switching rotating shaft; 22. Fixed seat; 23. Sub-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 component; 41. Side clamping cylinder; 42. Stroke bar; 421. Slide rail; 43. Side clamping plate; 44. Guide rod; 45. Clamping spring; 5. Pallet component; 51. Sliding pin; 52. Connecting rod; 53. Hinge seat slider; 54. Supporting plate; 6. Clamping component; 61. Elastic base; 611. Sliding base; 612. Guide post; 613. Adaptive spring; 62. Clamping plate; 621. Ball; 63. Bidirectional lead 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 implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In order to enable those in the technical field to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] A milling tooling for a power take-off housing casting, used for Figure 3The end faces at three places, namely the base 71, the input port 72, and the output port 73 of the power take-off housing 7 shown in the figure, are milled. The power take-off housing 7 is a casting workpiece. This milling tooling is used to cooperate with the existing milling machine tool to mill the power take-off housing 7 shown in the figure. It should be noted that the milling machine tool is preferably a horizontal milling machine tool. In addition to including a tool spindle for installing a milling cutter, this horizontal milling machine tool also includes a workbench spindle 81 for fixedly installing a workpiece fixture to cooperate with milling. The tool spindle can move in the X, Y, and Z axis directions in space. A dividing shaft 83 rotatably installed perpendicular to the workbench spindle 81 is also provided on the workbench spindle 81. The milling tooling provided by the present invention is specifically installed on this dividing shaft 83. During the milling process, the dividing shaft 83 of the machine tool can drive the milling tooling and the power take-off housing 7 as a whole to rotate to achieve the milling switching of the three end faces. The above-mentioned horizontal milling machine tool with multiple axes is an existing machine tool equipment.

[0032] As Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 10 As shown in the figure, the milling tooling includes an auxiliary support 1; the auxiliary support 1 includes a positioning socket 11, a plugging column 12, and a U-shaped frame 13; the inside of the positioning socket 11 is a square socket hole. In this embodiment, the positioning socket 11 is fixed to the rotating mounting seat 82 of the machine tool dividing shaft 83 by screws, and the central axis of the socket hole of the fixed positioning socket 11 coincides with the central axis of the workbench spindle 81 of the machine tool; the plugging column 12 is a square shaft structure that matches the socket hole of the positioning socket 11, and the plugging column 12 is plugged into the positioning socket 11. The U-shaped frame 13 is in the structure of a U-shaped plate. One end of the plugging column 12 located outside the positioning socket 11 is welded to the side walls at the middle positions of the opposite ends of the U-shaped frame 13, and the welding position of the plugging column 12 is outside the U-shaped notch of the U-shaped frame 13.

[0033] As Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, the milling tooling further includes a tooling fixture for clamping and fixing the power take-off housing 7 to facilitate stable milling. The tooling fixture is fixedly assembled on the indexing shaft 83 of the machine tool, and the indexing shaft 83 drives the power take-off housing 7 together with the tooling fixture to rotate integrally to switch the milling end face. It should be added that the indexing shaft 83 of the machine tool itself has a position self-locking function. In this embodiment, the tooling fixture is also rotatably installed on the U-shaped frame 13. The tooling fixture includes two rotating shaft assemblies 2, a reference frame 3, side clamping assemblies 4, a support plate assembly 5, and a clamping assembly 6. It should be noted here that the following descriptions of the assembly and connection methods of the components in the tooling fixture are all 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 respectively assembled on the two locking blocks 14. 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 through the locking block 14. One end of the secondary rotating shaft 23 extending into the frame of the U-shaped frame 13 is welded with a coupling frame 25. A fixing seat 22 is welded between the other end of the switching rotating shaft 21 and the secondary rotating shaft 23. A locking component 24 cooperating with the locking block 14 is assembled on the fixing seat 22. The locking component 24 and the cooperating locking block 14 form a locking assembly. Four locking holes 141 are circumferentially and evenly distributed around the secondary rotating shaft 23 on the locking block 14. The central axis of the locking holes 141 is located on the radial direction of the secondary rotating shaft 23, that is, the four locking holes 141 are in a cross structure, and the intersection point is on the central axis of the pipe through hole of the secondary rotating shaft 23 on the locking block 14. The locking component 24 includes a cylinder 241 fixed on the fixing seat 22 by bolts and a locking pin 242 welded to the output end of the cylinder 241. The locking pin 242 is matched with the locking holes 141. When the milling end face of the power take-off housing 7 is switched, the locking component 24 and the locking block 14 can cooperate to lock the switching rotating shaft 21 on the auxiliary bracket 1.

[0034] It should be noted that the indexing shaft 83 has a two-section structure composed of two shaft sections, so as to facilitate the corresponding fixation of the two switching rotating shafts 21 on the two shaft sections. Both shaft sections are rotatably installed on the rotating mounting seat 82, and one of the shaft sections is fixedly connected to the driving end of the indexing shaft 83. When installing the milling tooling provided by the present invention on the workbench spindle 81 of the machine tool, the tooling fixture can be pre-assembled on the U-shaped frame 13 through the two rotating shaft assemblies 2 first, and the positioning socket 11 is also pre-fixed on the rotating mounting seat 82 of the indexing shaft 83. During installation, the plug post 12 is inserted into the positioning socket 11 and adjusted by sliding, so that the two switching rotating shafts 21 are aligned with the two shaft sections of the indexing shaft 83. A split coupling 84 can be used to fixedly connect the switching rotating shaft 21 and the shaft section. Here, the plug-in fit between the plug post 12 and the positioning socket 11 can perform the initial installation positioning to facilitate the assembly operation, and the plug-in method is slidably adjustable, which is also conducive to the adjustment and alignment between the switching rotating shaft 21 and the shaft section to facilitate the installation of the coupling 84.

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

[0036] As Figure 1 , Figure 3 , Figure 5, Figure 6 , Figure 7 and Figure 9 As shown in Figure 6 , Figure 7 , and Figure 9 , two symmetrically arranged slide rails 421 are provided on the stroke bar 42, and both of the two slide rails 421 extend along the length direction of the stroke bar 42 to the end; a support plate assembly 5 is correspondingly assembled on each of the two slide rails 421, two guide holes 32 corresponding to and cooperating with 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 penetrates through the corresponding guide hole 32, and the sliding pin 51 moves along the guide hole 32. A support plate 54 is welded to one end of the sliding pin 51 passing through the guide hole 32. A hinge block 53 is slidably installed on the support plate 54 along its length direction, and a connecting rod 52 is hinged between the hinge block 53 and the reference frame 3; a rubber layer is fixedly covered on the supporting surface of the support plate 54 in contact with the base 71, so that the gap between the support 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] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , and Figure 6 , a clamping assembly 6 for clamping and positioning the power take-off housing 7 in a direction perpendicular to the clamping direction of the side clamping structure is assembled on the reference frame 3; the clamping assembly 6 includes two horizontally opposed elastic bases 61, two chutes corresponding to and assembled with the two elastic bases 61 are provided on the reference frame 3, and the two chutes are correspondingly distributed on the two side edges of the reference frame 3 adjacent to the side where the notch is provided. A clamping plate 62 is correspondingly assembled on each of the two elastic bases 61, and the two clamping plates 62 are horizontally opposed; the elastic base 61 includes a sliding base 611 slidably installed in the chute, two guide posts 612 are welded to the upper end surface of the sliding base 611, the clamping plate 62 is slidably installed on the two guide posts 612, and an adaptive spring 613 is sleeved on the guide post 612. Two ends of the adaptive spring 613 are respectively welded to the sliding base 611 and the clamping plate 62; the clamping plate 62 matches the outer contour of the power take-off housing 7. In order to address the problem of poor clamping due to the possibly rough or uneven surface of the casting wall of the power take-off housing 7, balls 621 are evenly embedded on the side surface of the clamping plate 62 for clamping, and multi-point clamping contact is achieved between the side clamping plate 43 and the outer wall of the power take-off housing 7 by using the balls 621. A two-way lead screw 63 is rotatably installed on the two coupling frames 25 through bearings, and the two clamping plates 62 are correspondingly threadedly connected to the two threaded sections of the two-way lead screw 63.

[0038] The present invention provides a milling tooling for a power take-off housing casting. The following elaborates on the machining process of milling the power take-off housing 7: First, the indexing shaft 83 drives the tooling fixture to rotate, so that the reference frame 3 is in a horizontal state with the front side facing up. Then, two cylinders 241 drive the locking pins 242, so that the locking pins 242 are inserted into the locking holes 141. Through the locking cooperation between the locking member 24 and the locking block 14, while the indexing shaft 83 locks the position of the tooling fixture, the tooling fixture is further relatively locked on the auxiliary support 1.

[0039] Next, the power take-off housing 7 is passed through the reference frame 3 and placed on the reference frame 3. Then, the side clamping cylinder 41 is started, so that the stroke bar 42 slides towards the direction close to the power take-off housing 7. The side clamping plate 43 pushes the power take-off housing 7 to translate until one axial end contacts with the two side clamping parts 31. As the side clamping plate 43 continues to move, then under the elastic force of the clamping spring 45, the power take-off housing 7 is clamped between the side clamping plate 43 and the two side clamping parts 31, and the axial two ends of the power take-off housing 7 are completed with side clamping fixation. During the movement of the stroke bar 42, the stroke bar 42 drives the two sliding pins 51 to move along the guide holes 32, and the two supporting plates 54 move towards each other and approach, 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 with the base 71 is the largest, being in the best clamping effect. Supplementary explanation, when milling the end face of the base 71 of the power take-off housing 7, it is naturally necessary to completely expose the end face of the base 71. At this time, the side clamping cylinder 41 can be started again, so that the stroke bar 42 further moves closer to the power take-off housing 7, and the side clamping spring is further compressed. The side clamping 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 further move along the guide holes 32, so that the distance between the two supporting 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 lead screw 63, the two clamping plates 62 are driven to slide towards each other and approach. With the cooperation of the two elastic bases 61, the clamping plates 62 are in multi-point contact through the balls 621 and adaptively clamp on the power take-off housing 7. The cooperation of the two clamping plates 62 enables the power take-off housing 7 to be clamped in the direction perpendicular to its axis and parallel to the base 71, and further clamped in the direction perpendicular to the base 71. Thus, the power take-off housing 7 is fixed and clamped by the tooling fixture. Compared with the existing fixture, which only clamps the power take-off housing 7 at the positions near both ends of the indexing shaft 83 in terms of the clamping structure design and clamping method, the tooling fixture provided by the present invention can comprehensively 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 processing.

[0041] After completing the fixed clamping of the power take-off housing 7, milling processing can be carried out. During processing, since the base 71 is in the upward state when the power take-off housing 7 is fixed, the input port 72 or the output port 73 can be milled first, specifically depending on the clamping state at both axial ends. For example, Figure 7 in the shown clamping state, the three end faces of the input port 72, the base 71, and the output port 73 are processed in sequence. During processing, by rotating and switching through the indexing shaft 83, the port to be processed is rotated to face the milling cutter spindle, and then milling processing is carried out. It should be added that before rotating and switching through the indexing shaft 83, the locking pin 242 is withdrawn from the locking hole 141. When the rotation and switching are completed, the locking pin 242 is inserted into the corresponding locking hole 141 again to maintain the locked state of the cooperation with the auxiliary support 1. In addition, when milling the end face of the base 71, the two supporting plates 54 are moved away from the end face of the base 71, making the end face of the base 71 completely exposed. When milling the input port 72 and the output port 73, the two supporting plates 54 and the reference frame 3 maintain the clamping state with the base 71 to ensure the stability of the milling processing.

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

[0043] The present invention provides a milling tooling for a power take-off housing casting, which is composed of an auxiliary bracket 1 and a tooling fixture that is rotationally matched with the auxiliary bracket 1. On the one hand, the auxiliary bracket 1 strengthens the rotational support for the tooling fixture. On the other hand, by cooperating with the locking component 24 arranged in the tooling fixture, the cooperation locking between the tooling fixture and the auxiliary bracket 1 can be realized. It can further enhance the position locking state in cooperation with the indexing shaft 83 to achieve stable positioning milling. In addition, compared with the existing fixture, only the clamping structure design and clamping method for clamping the power take-off housing 7 at the positions near both ends of the indexing shaft 83 are adopted. The tooling fixture is provided with multi-angle and multi-dimensional clamping structures, which greatly improve the stability during milling processing; through the auxiliary support and cooperation locking of the auxiliary bracket 1, and through the comprehensive clamping and positioning of the tooling fixture, the effects of reduced clamping reliability and poor milling stability caused by the change of the center of gravity in space and the change of the distance between the milling end face and the indexing shaft 83 after switching the milling end face are weakened, which is beneficial 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 orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 construed as a limitation of the present invention.

[0045] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0046] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A milling tooling for the 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; characterized in that, The milling tooling includes: An auxiliary bracket; Two rotating shaft assemblies, which are coaxially and oppositely arranged and rotatably installed on the auxiliary bracket, and locking assemblies for restricting the rotation of the rotating shaft assemblies are arranged in cooperation between each of them and the auxiliary bracket; A reference frame, fixed between the two rotating shaft assemblies, for positioning the base; A side clamping assembly, assembled on the reference frame, for axially side-clamping and positioning the power take-off housing in cooperation with the reference frame; Two pallet assemblies, oppositely arranged and connected to the side clamping assembly; when axially side-clamping and positioning, the side clamping assembly indirectly drives the two pallet assemblies to clamp the base between the reference frame and the two pallet assemblies; And a clamping assembly, assembled on the reference frame, for clamping and positioning the power take-off housing in a direction perpendicular to the clamping direction of 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 in clamping contact with the two pallet assemblies. When the base is in a vertical state, the side clamping assembly drives the two pallet assemblies to separate from the end face of the base.

2. The milling tooling for a power take-off housing casting according to claim 1, wherein: 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 respectively assembled on the two locking blocks; the rotating shaft assembly includes a switching rotating shaft and a secondary rotating shaft coaxially arranged with the switching rotating shaft. The secondary rotating shaft is rotatably installed through the locking block. One end of the secondary rotating shaft extending into the frame of the U-shaped frame is fixed with a connecting shaft frame, the reference frame is fixed between the two connecting shaft frames, a fixed seat is fixed between the other end of the switching rotating shaft and the secondary rotating shaft, and a locking component cooperating with the locking block is assembled on the fixed seat. When the end face to be milled of the power take-off housing is switched, the locking component and the locking block cooperate to lock the switching rotating shaft on the auxiliary bracket.

3. A milling tooling for a power take-off housing casting according to claim 1, characterized in that: A side clamping portion for clamping and contacting the side wall on the side where the input port or the output port is located is arranged on the reference frame, and the side clamping assembly is used to clamp the other axial end of the power take-off housing in cooperation with the side clamping portion; the side clamping assembly includes a travel bar slidably and drivingly installed on the reference frame, a side clamping plate is slidably installed on the travel bar, and the side clamping plate and the travel bar are connected by an elastic member; the two pallet assemblies are symmetrically connected to positions near both ends of the travel bar.

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

5. The milling tooling for the power take-off housing casting according to claim 2, characterized in that: The clamping assembly includes two elastic bases that are relatively slidably mounted on the reference frame along a direction perpendicular to the side clamping direction of the side clamping assembly. Clamping plates are correspondingly assembled on both of the two elastic bases, and the two clamping plates are arranged oppositely; the power take-off housing is clamped between the two clamping plates.

6. A milling tooling for a power take-off housing casting according to claim 2, characterized in that: Four locking holes are circumferentially and uniformly distributed around the secondary rotating shaft on the locking block, and the central axis of the locking hole is located on the radial direction of the secondary rotating shaft; the locking component includes a cylinder fixed on the fixed seat and a locking pin fixed on the output end of the cylinder, and the locking pin is matched with the locking hole.

7. A milling tooling for a power take-off housing casting according to claim 2, characterized in that: The auxiliary bracket further includes a positioning socket and a plug post that can be cooperatively inserted into the positioning socket, and the insertion direction of the plug post relative to the positioning socket is perpendicular to the axial direction of the switching rotating shaft; the plug post is fixed on the outer side wall of the frame of the U-shaped frame.

8. A milling tooling 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 posts are fixed on the sliding base, the clamping plate is slidably mounted on the plurality of guide posts, a self-adaptive spring is sleeved on the guide posts, and both ends of the self-adaptive spring are respectively fixed on the clamping plate and the sliding base.

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

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