Inner ball turning tool for differential shell

Abstract

The invention relates to the technical field of numerical control machining equipment, in particular to an inner ball turning tool for a differential shell, which comprises a main body unit, an adjusting unit, a driving mechanism arranged on a tool apron, a transmission mechanism arranged on the tool apron and a tool bar body, a fixing mechanism arranged on a corner tool holder and used for fixing a blade body, and a cooling unit, by adopting the blade design with the adjustable angle, the adaptability and the operation convenience of the cutter are improved, the large-diameter cutter bar design can be directly adopted, the cutting rigidity can be further improved, vibration and deformation in the high-speed cutting process are avoided, the machining precision is guaranteed, meanwhile, the cutter breakage risk is reduced, and the production cost is reduced; by means of the cooling mechanism and the braking mechanism, cooling liquid is accurately sprayed to the machining position, tool abrasion and workpiece thermal deformation are reduced, the machining quality and the service life of a tool are further guaranteed, meanwhile, waste of the cooling liquid is avoided, and the production cost can be further reduced.

Description

Technical Field

[0001] This invention relates to the field of CNC machining equipment technology, specifically to an internal ball lathe tool for a differential housing. Background Technology

[0002] In the field of CNC machining, the differential housing is the core load-bearing and transmission component of the automotive transmission system. The machining accuracy of the internal spherical holes directly determines the transmission efficiency, operational stability and service life. Therefore, it places extremely high demands on the structural design, adaptability and ease of operation of the machining tools. At present, the mainstream tools for machining the inner circle of the differential housing in the industry are mainly hook turning tools and gooseneck tools. Due to the special structure of the differential housing, the internal spherical hole diameter needs to be relatively large, while the external inlet diameter for the tool to enter the housing is relatively small, forming a "small outside, large inside" structural feature. For hook turning tools, in order to adapt to this structure, the tool head needs to be designed with a fixed bending shape to bypass the inlet restriction and enter the interior. However, the fixed bending structure imposes strict limitations on the tool shank size. In order to ensure that the tool can pass through the narrow inlet smoothly, the tool shank diameter must be greatly reduced. This may lead to insufficient tool shank rigidity, which is prone to vibration and deformation during high-speed cutting. This not only affects the machining accuracy but also easily causes tool breakage and increases production costs. Although the gooseneck cutter has been optimized in structure, it requires complex feeding and rotational movements when extending into the differential housing, making the operation process relatively cumbersome. It also requires high control precision of the processing equipment, increasing the equipment debugging cost and operation threshold. In addition, to meet the need for extension into the narrow entrance, the gooseneck cutter also needs to adopt a small-diameter tool holder design, which still has the problem of insufficient cutting rigidity. In view of this, we propose an internal ball lathe tool for differential housing. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention provides an internal ball lathe tool for differential housings, which effectively solves the problems of insufficient tool shank rigidity, cumbersome operation, and high equipment debugging costs associated with existing hook lathe tools and gooseneck tools, which are limited by the "small outside, large inside" structure of the differential housing.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an internal ball-turning tool for a differential housing, comprising a main body unit, including a tool holder, a tool shank body disposed on the tool holder, a corner tool holder disposed on the tool shank body, and a cutting insert body disposed on the corner tool holder. The adjustment unit includes a drive mechanism mounted on the tool holder, a transmission mechanism mounted on the tool holder and the tool holder body, a fixing mechanism mounted on the corner tool holder for fixing the blade body, and a delivery pipe mounted on the tool holder for delivering hydraulic solution inside the tool holder. The drive mechanism and the transmission mechanism are used to drive the fixing mechanism to move, thereby achieving a 90-degree rotation adjustment of the blade body. The adjustment mechanism is also used to drive the blade body to reset when the drive mechanism and the transmission mechanism are depressurized. The cooling unit includes a cooling mechanism mounted on the corner tool holder for spraying coolant onto the machining position of the differential housing during machining, and a braking mechanism mounted on the corner tool holder for adjusting the opening and closing of the cooling mechanism according to the rotation state of the tool body.

[0005] Furthermore, the driving mechanism includes a piston fitted inside the inner wall of the tool holder, a push rod fixedly connected to one side of the piston, and the end of the push rod away from the piston moves through the tool holder and is fixedly connected to a push plate.

[0006] Furthermore, a return spring is fixedly connected to the side of the push plate near the push rod, and a baffle is fixedly connected to the end of the return spring away from the push plate. One side of the baffle is fixedly connected to the surface of the tool holder, and a strip groove is opened on the surface of the baffle. A limiting block for sliding cooperation with the strip groove is fixedly connected to the surface of the push rod, and the limiting block is also used for abutting cooperation with the baffle.

[0007] Furthermore, the transmission mechanism includes a second piston disposed on the side of the first piston away from the push rod, and the surface of the second piston is sleeved on the inner wall of the tool holder.

[0008] Furthermore, a piston rod is fixedly connected to the side of piston two away from piston one. The end of the piston rod away from piston two moves through the tool holder and the tool bar body and extends to the inner wall of the corner tool holder. A rotary joint for connecting with the fixing mechanism is fixedly connected to the end of the piston rod extending to the corner tool holder.

[0009] Furthermore, the fixing mechanism includes a blade fixing head rotatably connected to the inner wall of the rotary joint, with one side of the blade fixing head fixedly connected to the fixing end of the blade body.

[0010] Furthermore, the two sides of the blade fixing head are rotatably connected to the inner wall of the corner blade holder via a fixing shaft. A torsion spring is fixedly connected to the surface of the fixing shaft, and the end of the torsion spring away from the fixing shaft is fixedly connected to the inner wall of the corner blade holder.

[0011] Furthermore, the cooling mechanism includes a sealing cylinder fixedly connected to the inner wall of the corner cutter holder, a nozzle fixedly connected to the output end of the sealing cylinder, a liquid supply pipe fixedly connected to the input end of the sealing cylinder, and the end of the liquid supply pipe away from the sealing cylinder fixedly passing through the cutter bar body and the cutter holder and extending to the outside of the cutter holder.

[0012] Furthermore, a sealing plate is provided inside the sealing cylinder, and the two sides of the sealing plate are rotatably connected to the inner wall of the sealing cylinder through a fixed shaft two. A torsion spring two is fixedly connected to the surface of the fixed shaft two, and the end of the torsion spring two away from the fixed shaft two is fixedly connected to the inner wall of the sealing cylinder.

[0013] Furthermore, the braking mechanism includes a rubber sleeve fixedly connected to one side of the sealing cylinder. A cam is provided inside the rubber sleeve for abutting and cooperating with the blade fixing head. An elastic telescopic rod is fixedly connected to the side of the cam near the sealing cylinder. The fixed end of the elastic telescopic rod is fixedly connected to the side of the sealing cylinder near the rubber sleeve. A push rod is fixedly connected to the surface of the elastic telescopic rod. The end of the push rod away from the elastic telescopic rod moves through the sealing cylinder and extends into the interior of the sealing cylinder for abutting and cooperating with the sealing plate.

[0014] The technical solution provided by this invention has the following advantages compared with known public technologies: This invention employs an angle-adjustable blade design. Before machining, the blade and tool holder are aligned to easily pass through the narrow inlet of the differential housing. After insertion, the blade is driven by an adjustment mechanism to rotate 90 degrees and align with the machining position. This effectively adapts to the "small outside, large inside" structure of the housing, improving the tool's adaptability and ease of operation. By optimizing the tool structure design, the problem of diameter reduction due to adapting to the narrow inlet can be avoided, allowing for the direct use of a large-diameter tool holder design. Combined with the stable support of the adjustment mechanism, this further enhances cutting rigidity, avoids vibration and deformation during high-speed cutting, ensures machining accuracy, reduces the risk of tool breakage, and lowers production costs. Through the linkage cooling control design, the opening and closing of the cooling mechanism is automatically triggered by the rotation of the cutting tool, so that the coolant is accurately sprayed to the machining position, which can remove the cutting heat in time, reduce tool wear and workpiece thermal deformation, further ensure machining quality and tool life, and avoid coolant waste, which can further reduce production costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 A cross-sectional view of the tool holder and tool shank body of the present invention; Figure 3 This is a schematic diagram of the drive mechanism structure of the present invention; Figure 4This is a cross-sectional view of the tool holder and baffle of the present invention; Figure 5 This is a schematic diagram of the transmission mechanism and fixing mechanism of the present invention; Figure 6 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A; Figure 7 This is a cross-sectional view of the rubber sleeve of the present invention; Figure 8 This is a cross-sectional view of the rubber sleeve and sealing cylinder of the present invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point B.

[0017] The labels in the diagram represent: 100, main unit; 101, tool holder; 102, tool holder body; 103, corner tool holder; 104, blade body. 200. Adjustment unit; 201. Drive mechanism; 2011. Push plate; 2012. Push rod; 2013. Return spring; 2014. Piston one; 2015. Strip groove; 2016. Limit block; 2017. Baffle; 202. Transmission mechanism; 2021. Piston two; 2022. Piston rod; 2023. Rotary joint; 203. Fixing mechanism; 2031. Blade fixing head; 2032. Fixing shaft one; 2033. Torsion spring one; 204. Infusion tube; 300. Cooling unit; 301. Cooling mechanism; 3011. Sealing cylinder; 3012. Nozzle; 3013. Liquid supply pipe; 3014. Sealing plate; 3015. Fixed shaft two; 3016. Torsion spring two; 302. Braking mechanism; 3021. Rubber sleeve; 3022. Cam; 3023. Elastic telescopic rod; 3024. Top rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] like Figures 1 to 9As shown, an internal ball lathe tool for a differential housing includes a main unit 100, comprising a tool holder 101, a tool shank body 102 disposed on the tool holder 101, a corner tool holder 103 disposed on the tool shank body 102, and a blade body 104 disposed on the corner tool holder 103. It also includes an adjustment unit 200, comprising a drive mechanism 201 disposed on the tool holder 101, a transmission mechanism 202 disposed on the tool holder 101 and the tool shank body 102, a fixing mechanism 203 disposed on the corner tool holder 103 for fixing the blade body 104, and a delivery pipe 204 disposed on the tool holder 101 for delivering hydraulic solution to the inside of the tool holder 101. The drive mechanism 201 and the transmission mechanism 202 drive the fixing mechanism 203 to move, thereby achieving tool adjustment. The blade body 104 can be rotated 90 degrees. The adjustment mechanism 203 is also used to drive the blade body 104 to reset when the drive mechanism 201 and transmission mechanism 202 are depressurized. The cooling unit 300 includes a cooling mechanism 301 set on the corner tool holder 103 for spraying coolant onto the machining position of the differential housing during machining, and a braking mechanism 302 set on the corner tool holder 103. The braking mechanism 302 is used to adjust the opening and closing of the cooling mechanism 301 according to the rotation state of the blade body 104. The tool holder body 102 is fixedly installed on the tool holder 101. The corner tool holder 103 is assembled on the end of the tool holder body 102 away from the tool holder 101. The blade body 104 is installed on the corner tool holder 103 through the fixing mechanism 203, forming a complete cutting execution assembly. It should be noted that the adjustment unit 200 is used to realize the angle adjustment and reset of the blade body 104. It includes a drive mechanism 201, a transmission mechanism 202, a fixing mechanism 203, and a liquid inlet pipe 204. The liquid inlet pipe 204 is set on the tool holder 101 and is responsible for supplying hydraulic solution to the inside of the tool holder 101. The drive mechanism 201 and the transmission mechanism 202 cooperate to transmit power, drive the fixing mechanism 203 to move, and thus realize the 90-degree rotation adjustment of the blade body 104. When the drive mechanism 201 and the transmission mechanism 202 are depressurized, the fixing mechanism 203 can drive the blade body 104 to automatically reset. The cooling unit 300 is used for cooling during the processing. It consists of a cooling mechanism 301 and a braking mechanism 302. Both are installed on the corner tool holder 103. The cooling mechanism 301 can spray coolant onto the processing position of the differential housing. The braking mechanism 302 can flexibly adjust the opening and closing of the cooling mechanism 301 according to the rotation state of the blade body 104 to ensure that the cooling timing is accurately matched with the processing state. Specifically, refer to Figures 2 to 4The drive mechanism 201 includes a piston 2014 sleeved on the inner wall of the tool holder 101. A push rod 2012 is fixedly connected to one side of the piston 2014. The end of the push rod 2012 away from the piston 2014 moves through the tool holder 101 and is fixedly connected to a push plate 2011. A return spring 2013 is fixedly connected to the side of the push plate 2011 near the push rod 2012. A baffle 2017 is fixedly connected to the end of the return spring 2013 away from the push plate 2011. One side of the baffle 2017 is fixedly connected to the surface of the tool holder 101. A strip groove 2015 is formed on the surface of the baffle 2017. A limiting block 2016 for sliding cooperation with the strip groove 2015 is fixedly connected to the surface of the push rod 2012. 016 is also used to abut against the baffle 2017; the piston 2014 is sleeved on the inner wall of the tool holder 101 and can slide linearly along the inner wall of the tool holder 101. One side of the piston 2014 is fixedly connected to the push rod 2012. The end of the push rod 2012 away from the piston 2014 moves through the side wall of the tool holder 101 and is fixedly connected to the push plate 2011. The push plate 2011 is used to receive external driving force. A return spring 2013 is fixedly connected to the side of the push plate 2011 near the push rod 2012. The end of the return spring 2013 away from the push plate 2011 is fixed to the baffle 2017. One side of the baffle 2017 is fixed to the surface of the tool holder 101 to provide a support base for the return spring 2013. It should be noted that the surface of the baffle 2017 is provided with a strip groove 2015, and the surface of the push rod 2012 is fixedly connected with a limiting block 2016. The limiting block 2016 and the strip groove 2015 form a sliding fit, which can limit the movement direction of the push rod 2012 and prevent it from deviating. At the same time, the limiting block 2016 can abut against the baffle 2017. After the blade body 104 is adjusted to ninety degrees and is perpendicular to the tool holder body 102, the limiting block 2016 and the push plate 2011 can be abutted by rotating the push plate 2011 and the push rod 2012, thereby forming a lock, ensuring stable pressure, and enabling the blade body 104 to perform stable processing. Specifically, refer to Figure 2 and Figure 5The transmission mechanism 202 includes a piston 2021 disposed on the side of piston 1 2014 away from push rod 2012. The surface of piston 2 2021 is sleeved on the inner wall of tool holder 101. A piston rod 2022 is fixedly connected to the side of piston 2 2021 away from piston 1 2014. The end of piston rod 2022 away from piston 2 2021 moves through tool holder 101 and tool holder body 102 and extends to the inner wall of corner tool holder 103. A rotary joint 2023 for connecting with a fixing mechanism is fixedly connected to the end of piston rod 2022 extending to corner tool holder 103. Piston 2 2021 is sleeved on the inner wall of tool holder 101 and is located on the side of piston 1 2014 away from push rod 2012. A closed hydraulic transmission chamber is formed between piston 1 2014 and piston 2 2021. The hydraulic solution input by infusion pipe 204 can cause piston 1 2014 to drive piston 2 2021 to move. It should be noted that the side of piston 2021 away from piston 1 2014 is fixedly connected to piston rod 2022. The end of piston rod 2022 away from piston 2021 moves sequentially through the side wall of tool holder 101 and tool holder body 102, extending to the inner wall of corner tool holder 103. The end of piston rod 2022 extending into corner tool holder 103 is fixedly connected to rotary joint 2023. Rotary joint 2023 is used to connect with fixed mechanism 203 to realize the power steering transmission and ensure that the linear motion of piston 2021 can be converted into the rotational motion of fixed mechanism 203. Specifically, refer to Figure 2 and Figure 5 The fixing mechanism 203 includes a blade fixing head 2031 rotatably connected to the inner wall of a rotary joint 2023. One side of the blade fixing head 2031 is fixedly connected to the fixed end of the blade body 104. Both sides of the blade fixing head 2031 are rotatably connected to the inner wall of the corner blade holder 103 via a fixing shaft 2032. A torsion spring 2033 is fixedly connected to the surface of the fixing shaft 2032. The end of the torsion spring 2033 away from the fixing shaft 2032 is fixedly connected to the inner wall of the corner blade holder 103. One side of the blade fixing head 2031 is fixedly connected to the fixed end of the blade body 104, and the inner wall is rotatably engaged with the rotary joint 2023, so that the power transmitted by the rotary joint 2023 can drive the blade fixing head 2031 to rotate, thereby driving the blade body 104 to adjust its angle. It should be noted that the two sides of the blade fixing head 2031 are rotatably connected to the inner wall of the corner tool holder 103 via the fixing shaft 2032. The surface of the fixing shaft 2032 is fixedly connected to the torsion spring 2033. The end of the torsion spring 2033 away from the fixing shaft 2032 is fixed to the inner wall of the corner tool holder 103. When the drive mechanism 201 and the transmission mechanism 202 transmit power, the blade fixing head 2031 rotates around the fixing shaft 2032, and the torsion spring 2033 undergoes elastic deformation, which can complete the 90-degree adjustment of the blade body 104, so that the blade body 104 and the tool holder body 102 are perpendicularly aligned, which is convenient for machining the inner hole of the differential housing. When the drive mechanism 201 and the transmission mechanism 202 depressurize, the elastic restoring force of the torsion spring 2033 can drive the blade fixing head 2031 to reset, thereby restoring the blade body 104 to the initial position, which is convenient for smoothly removing the blade body 104 from the differential housing after machining. Specifically, refer to Figures 6 to 9 The cooling mechanism 301 includes a sealing cylinder 3011 fixedly connected to the inner wall of the corner cutter clamp 103. A nozzle 3012 is fixedly connected to the output end of the sealing cylinder 3011, and a liquid supply pipe 3013 is fixedly connected to the input end of the sealing cylinder 3011. The end of the liquid supply pipe 3013 away from the sealing cylinder 3011 passes through the cutter bar body 102 and the cutter holder 101 and extends to the outside of the cutter holder 101. A sealing plate 3014 is provided inside the sealing cylinder 3011. The two sides of the sealing plate 3014 are rotatably connected to the sealing cylinder 3011 through a fixed shaft 3015. A torsion spring 3016 is fixedly connected to the surface of the fixed shaft 3015. The end of the torsion spring 3016 away from the fixed shaft 3015 is fixedly connected to the inner wall of the sealing cylinder 3011. The sealing cylinder 3011 is fixedly installed on the inner wall of the corner cutter clamp 103. The output end is fixedly connected to the nozzle 3012, and the input end is fixedly connected to the liquid supply pipe 3013. The end of the liquid supply pipe 3013 away from the sealing cylinder 3011 passes through the side wall of the cutter body 102 and the cutter holder 101 in sequence, and extends to the outside of the cutter holder 101 for connecting to an external coolant source. It should be noted that a sealing plate 3014 is provided inside the sealing cylinder 3011. The two sides of the sealing plate 3014 are rotatably connected to the inner wall of the sealing cylinder 3011 through a fixed shaft 3015. A torsion spring 3016 is fixedly connected to the surface of the fixed shaft 3015. The end of the torsion spring 3016 away from the fixed shaft 3015 is fixed to the inner wall of the sealing cylinder 3011. In the non-processing state, the sealing plate 3014 is kept sealed under the elastic force of the torsion spring 3016 to prevent coolant leakage. When cooling is required, the sealing plate 3014 is pushed open, and the coolant is sprayed from the nozzle 3012 to the processing position through the sealing cylinder 3011. Specifically, refer to Figures 6 to 9The braking mechanism 302 includes a rubber sleeve 3021 fixedly connected to one side of the sealing cylinder 3011. Inside the rubber sleeve 3021 is a cam 3022 for abutting against the blade fixing head 2031. An elastic telescopic rod 3023 is fixedly connected to the side of the cam 3022 near the sealing cylinder 3011. The fixed end of the elastic telescopic rod 3023 is fixedly connected to the side of the sealing cylinder 3011 near the rubber sleeve 3021. A push rod 3024 is fixedly connected to the surface of the elastic telescopic rod 3023. One end of the push rod 3024, away from the elastic telescopic rod 3023, moves through the sealing cylinder 3011 and extends into the interior of the sealing cylinder 3011 for abutting against the sealing plate 3014. The rubber sleeve 3021 is fixedly connected to one side of the sealing cylinder 3011. Inside the rubber sleeve 3021 is the cam 3022, which abuts against the blade fixing head 2031. When the blade fixing head 2031 rotates, it pushes the cam 3022 to produce displacement. It should be noted that the side of the cam 3022 closest to the sealing cylinder 3011 is fixedly connected to the elastic telescopic rod 3023. The fixed end of the elastic telescopic rod 3023 is fixed to the side of the sealing cylinder 3011 closest to the rubber sleeve 3021. A push rod 3024 is fixedly connected to the surface of the elastic telescopic rod 3023. The end of the push rod 3024 away from the elastic telescopic rod 3023 moves through the side wall of the sealing cylinder 3011 and extends into the interior of the sealing cylinder 3011, where it abuts against the sealing plate 3014. When the blade fixing head 2031 rotates and pushes the cam 3022, the cam 3022 drives the elastic telescopic rod 3023 to retract, and the push rod 3024... As the elastic telescopic rod 3023 moves and pushes open the sealing plate 3014, the cooling mechanism 301 is activated. At this time, the blade body 104 rotates to 90 degrees and is perpendicular to the tool holder body 102, which can be used for processing. At the same time, the elastic telescopic rod 3023 reaches its retraction limit and can abut against the blade fixing head 2031, further ensuring the stability of the blade body 104 during processing. When the blade fixing head 2031 is reset, the cam 3022 loses its thrust, the elastic telescopic rod 3023 is reset, the push rod 3024 is disengaged from the sealing plate 3014, and the sealing plate 3014 is reset and sealed under the action of the torsion spring 3016, and the cooling mechanism 301 is closed.

[0021] The working principle of the present invention: Before processing, the tool is in the initial standby state, the blade body 104 and the tool holder body 102 are in the same straight line, at this time the torsion spring 2033 is in the natural extension state, and the blade fixing head 2031 is not subjected to the thrust of the transmission mechanism 202. In the cooling mechanism 301, the sealing plate 3014 is tightly attached to the inner wall of the sealing cylinder 3011 under the elastic force of the torsion spring 3016, and is in a sealed state to prevent coolant leakage. The cam 3022 of the braking mechanism 302 is in contact with the blade fixing head 2031 but is not squeezed. The elastic telescopic rod 3023 is in an extended state, and the push rod 3024 does not exert force on the sealing plate 3014. At the same time, the standard blade body 104 can be replaced according to the material characteristics of the differential housing to be processed, and fixed by the blade fixing head 2031 to adapt to different processing requirements without replacing the entire set of tools. When machining begins, the entire tool is first inserted into the differential housing. Since the blade body 104 and the tool holder body 102 are set in the same direction, and the tool holder body 102 can be designed with a large diameter to ensure rigidity, it does not need to be reduced in size due to structural limitations like hook cutters and gooseneck cutters. This allows the tool to be easily and smoothly inserted into the machining position without the need for complex feed and rotation coordination. After the tool is positioned, the adjustment unit 200 is activated to adjust the blade angle. Pressurized hydraulic solution is delivered to the hydraulic chamber inside the tool holder 101 through the infusion tube 204. The hydraulic solution is located between piston one 2014 and piston two 2021. By pushing the push plate 2011, the push rod 2012 synchronously drives piston one 2014 to move. The return spring 2013 on one side of the push plate 2011 is compressed and undergoes elastic deformation. Piston one 2014 continues to move, pressurizing the hydraulic solution, thereby pushing piston two 2021 to move synchronously. Piston two 2021 drives piston rod 2022 to extend towards the angle tool holder 103. The rotary joint 2023 at the end of piston rod 2022 moves together, generating a lateral thrust on the blade fixing head 2031. Under the action of thrust, the blade fixing head 2031 rotates around the fixing shaft 2032 along the inner wall of the corner blade clamp 103, the torsion spring 2033 is twisted to generate elastic potential energy, and the blade body 104 rotates synchronously with the blade fixing head 2031. When the blade body 104 rotates to a position perpendicular to the blade holder body 102 at 90 degrees, the push plate 2011 can be rotated to drive the push rod 2012 and piston 2014 to rotate, and the return spring 2013 will be twisted, so that the limit block 2016 and the baffle 2017 form a locking structure to maintain the pressure stability of the hydraulic chamber. At this time, the cam 3022 of the braking mechanism 302 moves towards the sealing cylinder 3011 under the pressure of the blade fixing head 2031, pushing the elastic telescopic rod 3023 to retract. The push rod 3024 on the surface of the elastic telescopic rod 3023 moves together, passes through the side wall of the sealing cylinder 3011 and pushes open the sealing plate 3014, releasing the sealing state of the cooling mechanism 301. At the same time, the elastic telescopic rod 3023 retracts to the limit position, forming a reverse support for the blade fixing head 2031. With the elastic tension of the torsion spring 2033, it ensures that the blade body 104 maintains an angle stability during the processing, avoiding vibration from affecting the processing accuracy. After the cooling mechanism 301 is opened, external coolant is introduced into the sealing cylinder 3011 through the supply pipe 3013, and flows to the nozzle 3012 through the opened sealing plate 3014. The nozzle 3012 accurately sprays coolant at the machining position of the differential housing, which promptly removes the heat generated during the cutting process, reduces tool wear and workpiece thermal deformation, and ensures machining quality. At this time, the tool enters a stable cutting state. With the high rigidity support of the large-diameter tool holder body 102 and the precise positioning of the insert body 104, the inner hole of the differential housing is efficiently machined. Moreover, the tool holder body 102 can be combined with conventional tool sleeves, tool holders 101 and tool posts, which has strong versatility and reduces equipment adaptation costs. After processing, the hydraulic chambers of the drive mechanism 201 and the transmission mechanism 202 are depressurized. By rotating the push plate 2011 in the opposite direction, the push rod 2012 and the limiting block 2016 on the push rod 2012 are rotated, so that the limiting block 2016 is aligned with the strip groove 2015. At this time, the return spring 2013 releases elastic potential energy, pushing the push plate 2011, the push rod 2012 and the piston 1 2014 to return to the reverse direction, reducing the pressure of the hydraulic solution. At the same time, the torsion spring 1 2033 releases elastic potential energy synchronously, driving the blade fixing head 2031 to rotate in the opposite direction around the fixing shaft 1 2032. The blade body 104 is then reset to the same straight line as the blade holder body 102. At the same time, the piston rod 2022, the piston 2 2021 and the rotary joint 2023 are reset. During the reset process of the cutting tool fixing head 2031, the squeezing force on the cam 3022 gradually disappears, the elastic telescopic rod 3023 extends and resets under its own elasticity, the push rod 3024 disengages from the sealing plate 3014, and the sealing plate 3014 re-adheres to the inner wall of the sealing cylinder 3011 under the action of the second torsion spring 3016. The cooling mechanism 301 closes and stops spraying coolant. Finally, the reset tool can be smoothly removed from the differential housing, thus completing a complete machining cycle.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An internal ball lathe tool for a differential housing, comprising a main body unit (100), including a tool holder (101), a tool holder body (102) disposed on the tool holder (101), a corner tool holder (103) disposed on the tool holder body (102), and a blade body (104) disposed on the corner tool holder (103), characterized in that, include, The adjustment unit (200) includes a drive mechanism (201) disposed on the tool holder (101), a transmission mechanism (202) disposed on the tool holder (101) and the tool holder body (102), a fixing mechanism (203) disposed on the corner tool holder (103) for fixing the blade body (104), and a delivery pipe (204) disposed on the tool holder (101) for delivering hydraulic solution inside the tool holder (101). The drive mechanism (201) and the transmission mechanism (202) are used to drive the fixing mechanism (203) to move, thereby realizing a 90-degree rotation adjustment of the blade body (104). The adjustment mechanism (203) is also used to drive the blade body (104) to reset when the drive mechanism (201) and the transmission mechanism (202) are depressurized. The cooling unit (300) includes a cooling mechanism (301) disposed on the corner tool holder (103) for spraying coolant onto the machining position of the differential housing during machining, and a braking mechanism (302) disposed on the corner tool holder (103). The braking mechanism (302) is used to adjust the opening and closing of the cooling mechanism (301) according to the rotation state of the blade body (104).

2. The internal ball-handling tool for a differential housing according to claim 1, characterized in that, The drive mechanism (201) includes a piston (2014) sleeved on the inner wall of the tool holder (101), a push rod (2012) fixedly connected to one side of the piston (2014), and the end of the push rod (2012) away from the piston (2014) moving through the tool holder (101) and fixedly connected to a push plate (2011).

3. The internal ball-handling tool for a differential housing according to claim 2, characterized in that, A return spring (2013) is fixedly connected to the side of the push plate (2011) near the push rod (2012). A baffle (2017) is fixedly connected to the end of the return spring (2013) away from the push plate (2011). One side of the baffle (2017) is fixedly connected to the surface of the knife holder (101). A strip groove (2015) is opened on the surface of the baffle (2017). A limiting block (2016) for sliding cooperation with the strip groove (2015) is fixedly connected to the surface of the push rod (2012). The limiting block (2016) is also used for abutting cooperation with the baffle (2017).

4. The internal ball-handling tool for a differential housing according to claim 1, characterized in that, The transmission mechanism (202) includes a piston two (2021) disposed on the side of piston one (2014) away from push rod (2012), and the surface of piston two (2021) is sleeved on the inner wall of the tool holder (101).

5. The internal ball-handling tool for a differential housing according to claim 4, characterized in that, The piston 2 (2021) is fixedly connected to the piston rod (2022) on the side away from the piston 1 (2014). The end of the piston rod (2022) away from the piston 2 (2021) moves through the tool holder (101) and the tool bar body (102) and extends to the inner wall of the corner tool holder (103). The end of the piston rod (2022) extending to the corner tool holder (103) is fixedly connected to a rotary joint (2023) for connecting with the fixing mechanism.

6. The internal ball-handling tool for a differential housing according to claim 1, characterized in that, The fixing mechanism (203) includes a blade fixing head (2031) rotatably connected to the inner wall of the rotary joint (2023), and one side of the blade fixing head (2031) is fixedly connected to the fixing end of the blade body (104).

7. The internal ball-turning tool for a differential housing according to claim 6, characterized in that, The blade fixing head (2031) is rotatably connected to the inner wall of the corner blade holder (103) on both sides via a fixing shaft (2032). A torsion spring (2033) is fixedly connected to the surface of the fixing shaft (2032), and the end of the torsion spring (2033) away from the fixing shaft (2032) is fixedly connected to the inner wall of the corner blade holder (103).

8. The internal ball-handling tool for a differential housing according to claim 1, characterized in that, The cooling mechanism (301) includes a sealing cylinder (3011) fixedly connected to the inner wall of the corner cutter clamp (103), a nozzle (3012) fixedly connected to the output end of the sealing cylinder (3011), and a liquid supply pipe (3013) fixedly connected to the input end of the sealing cylinder (3011). The end of the liquid supply pipe (3013) away from the sealing cylinder (3011) is fixedly passed through the cutter body (102) and the cutter holder (101) and extends to the outside of the cutter holder (101).

9. The internal ball-handling tool for a differential housing according to claim 8, characterized in that, The sealing cylinder (3011) is provided with a sealing plate (3014) inside. The two sides of the sealing plate (3014) are rotatably connected to the inner wall of the sealing cylinder (3011) through a fixed shaft (3015). A torsion spring (3016) is fixedly connected to the surface of the fixed shaft (3015). The end of the torsion spring (3016) away from the fixed shaft (3015) is fixedly connected to the inner wall of the sealing cylinder (3011).

10. The internal ball-handling tool for a differential housing according to claim 1, characterized in that, The braking mechanism (302) includes a rubber sleeve (3021) fixedly connected to one side of the sealing cylinder (3011). The rubber sleeve (3021) is provided with a cam (3022) for abutting and cooperating with the blade fixing head (2031). An elastic telescopic rod (3023) is fixedly connected to the side of the cam (3022) near the sealing cylinder (3011). The fixed end of the elastic telescopic rod (3023) is fixedly connected to the side of the sealing cylinder (3011) near the rubber sleeve (3021). A top rod (3024) is fixedly connected to the surface of the elastic telescopic rod (3023). The end of the top rod (3024) away from the elastic telescopic rod (3023) moves through the sealing cylinder (3011) and extends into the interior of the sealing cylinder (3011) for abutting and cooperating with the sealing plate (3014).

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