A ring belt finishing composite boring cutter assembly for a heavy truck engine cylinder head and application thereof

Abstract

The present application relates to the technical field of finish machining composite boring tool, in particular to a ring belt finish machining composite boring tool assembly for heavy truck engine cylinder cover and application, comprising a tool holder module and a machining module, the tool holder module is used for connecting the machine tool spindle, and the machining module is detachably installed on the tool holder module. The tool holder module comprises a cover cylinder fixed to the end of the tool holder module, a plurality of locking beads embedded in the cylinder wall of the cover cylinder, a Latin movable in the axial direction and penetrating in the tool holder module, a locking tube fixed to the end of the Latin, and a rotating tube rotatingly arranged at the axial center of the cover cylinder. The Latin is pulled by the machine tool spindle tensioning mechanism, the locking tube is driven to move axially, the locking beads are forced to shrink radially and then clamped into the limiting ring groove of the connecting disc, the quick locking and releasing of the tool holder module and the machining module are realized, the module replacement is convenient, and the repeated positioning precision is high.

Description

Technical Field

[0001] This invention relates to the field of precision machining composite boring tools, and more specifically, to a ring-shaped precision machining composite boring tool assembly for heavy truck engine cylinder heads and its application. Background Technology

[0002] The machining of the ring band in heavy-duty truck engine cylinder head is a critical process in cylinder head manufacturing, requiring the sequential boring of the ring band holes and chamfering of the ring band end faces. Currently, the industry typically uses two independent cutting tools to perform these two processes separately, or a single integrated composite cutting tool to complete them in one operation.

[0003] Patent application CN202520951481.8 discloses a composite boring tool, including a round tube, a tool body slidably disposed inside the round tube, a tool holder fixedly disposed on one side of the round tube, a groove opened on the top of the tool body, a rotating rod rotatably disposed inside the groove, a gear fixedly disposed in the middle of the rotating rod, and a rack plate one and a rack plate two meshingly connected on both sides of the gear respectively; ensuring that the insert and the slot are mutually inserted, facilitating quick installation of the tool body.

[0004] However, existing composite cutting tools have the following problems in the machining process. First, the connection between the tool body module and the tool holder is usually fastened with bolts or with a tapered surface, which makes it cumbersome to replace the tool body module and makes it difficult to guarantee the accuracy of repeated positioning. Second, the two machining processes have different requirements for the coolant supply position, but the coolant channel of the existing cutting tools is usually fixed and cannot automatically switch the coolant outlet according to the machining process, resulting in poor cooling effect during hole opening and ring machining.

[0005] In view of this, we propose a ring-belt finishing composite boring tool assembly for heavy truck engine cylinder heads and its application. Summary of the Invention

[0006] The purpose of this invention is to provide a ring-belt precision machining composite boring tool assembly for heavy truck engine cylinder heads and its application. By pulling the lasing rod through the machine tool spindle tensioning mechanism, the locking tube moves axially, forcing the locking ball to retract radially and lock into the limiting ring groove of the connecting plate. This achieves rapid locking and releasing of the tool holder module and the machining module, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A composite boring tool assembly for finishing ring belts in heavy truck engine cylinder heads includes a tool holder module and a machining module. The tool holder module is used to connect to the machine tool spindle, and the machining module is detachably mounted on the tool holder module. The end and side of the machining module are respectively provided with a first insert for boring the main hole and a second insert for chamfering the ring belt. The tool holder module includes a cover tube fixed to the end of the tool holder module, several locking beads embedded in the wall of the cover tube, a axially movable lasing rod passing through the tool holder module, a locking tube fixed to the end of the lasing rod, and a rotating tube rotatably disposed at the center of the cover tube. A through hole for coolant to pass through is provided at the center of the lasing rod. The processing module includes a water supply pipe disposed at its axis and one end sleeved on the outside of the end of the rotating pipe, the water supply pipe rotating synchronously with the rotating pipe; In the above setup, during the drilling operation, the lasing plate moves axially under the tension of the machine tool, which drives the locking tube to move to the first position, forcing the locking ball to retract radially and lock the processing module in place. At this time, the through hole in the lasing plate is connected to the water passage inside the processing module through the water supply pipe, and the coolant is sprayed onto the working surface of the first blade. In the above setup, during the ring belt machining, the lasing tube continues to move axially, driving the locking tube to the second position and driving the rotating tube to rotate the water supply pipe, thereby switching the coolant passage and connecting the through hole to another water passage inside the machining module through the water supply pipe, so that the coolant is sprayed onto the working surface of the second blade.

[0008] In the technical solution of the present invention, a plurality of guide grooves are provided on the outer wall of the rotating tube. The guide groove is composed of a section of axial straight groove and a section of spiral groove connected end to end. A plurality of levers are snapped and fixed on the outer wall of the rotating tube. The ends of the levers are slidably fitted in the guide grooves. The rotating tube is axially limited relative to the cover cylinder by a retaining ring. The rotating tube can only rotate around its own axis and cannot move axially.

[0009] In the technical solution of the present invention, the tool holder module further includes a handle body. The outer wall of the handle body is provided with a notch for positioning with the machine tool spindle. The end of the handle body is provided with a stepped hole for the axial movement of the locking tube. During the ring processing, the locking tube moves to the second position, and its end face abuts against the stepped surface of the stepped hole.

[0010] In the technical solution of the present invention, a spring is sleeved on the outer side of the lasing arm, and the two ends of the spring abut against the wall of the stepped hole at the end of the handle and the outer wall of the locking tube, respectively, for pushing the lasing arm and the locking tube back to their original positions after the machine tool tension is released.

[0011] In the above setup, the axial movement of the lasing rod and locking tube, combined with the engagement of the locking ball and the limiting ring groove, achieves rigid locking between the tool holder module and the machining module, and utilizes the cooperation between the lever and the guide groove to provide a driving basis for subsequent coolant path switching.

[0012] In the technical solution of the present invention, the processing module further includes a blade body, a connecting plate fixedly connected to the end of the blade body by bolts, and a fixing tube tightly fitted inside the blade body. The outer wall of the connecting plate is provided with a limiting ring groove that is adapted to the spherical surface of the locking ball. When the locking ball is inserted into the limiting ring groove, surface contact is formed.

[0013] In the technical solution of the present invention, a fixing hole for placing a fixing tube is provided inside the blade body, a first water supply hole communicating with the fixing hole is provided through the axis of the blade body, and a plurality of second water supply holes are provided through the side walls at both ends of the fixing hole of the blade body. The first water supply hole faces the working surface of the first blade, and the second water supply hole faces the working surface of the second blade.

[0014] In the technical solution of the present invention, the water supply pipe is sleeved inside the fixed pipe and can rotate relative to the fixed pipe; a water passage groove is opened on the outer wall of the end of the fixed pipe, and a number of centrally symmetrically arranged connecting holes are opened on the pipe wall of the fixed pipe; a water supply groove is opened on the outer wall of the end of the water supply pipe, and a number of pipe wall through holes are opened through the pipe walls at both ends of the water supply pipe; a positioning block is integrally formed on the end of the rotating pipe away from the locking pipe; a positioning groove adapted to the positioning block is opened on the end face of the water supply pipe facing the rotating pipe; the positioning block is embedded in the positioning groove to realize the circumferential linkage between the rotating pipe and the water supply pipe.

[0015] In the technical solution of the present invention, the water passage and the water supply passage are both two centrally symmetrical fan-shaped passages; during the hole-opening operation, the water passage and the water supply passage overlap to form a coolant passage leading to the first water supply hole, at which time the pipe wall through hole and the connecting hole are circumferentially offset; during the ring-belt processing, after the water supply pipe is rotated, the water passage and the water supply passage are circumferentially offset, and the pipe wall through hole and the connecting hole are circumferentially aligned to form a coolant passage leading to the second water supply hole.

[0016] In the technical solution of the present invention, the first cutting tool is fixedly installed on the axial end face of the tool body by screws and is used for boring the main hole of the cylinder head ring belt hole; the second cutting tool is fixedly installed on the side of the tool body by screws and is used for chamfering of the cylinder head ring belt.

[0017] In the above setup, the water supply pipe is rotated relative to the fixed pipe by the rotating pipe, so that the water supply tank and the water passage tank are staggered and the through hole and the connecting hole in the pipe wall are aligned, so as to realize the automatic switching of coolant from the first water supply hole to the second water supply hole, and meet the cooling needs of different processes.

[0018] On the other hand, the present invention also provides an application of a composite boring tool assembly for finishing rings in heavy-duty truck engine cylinder heads. The composite boring tool assembly for finishing rings in heavy-duty truck engine cylinder heads described above is used in the integrated machining of the main hole boring and ring chamfering of the ring holes in the engine cylinder head.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The ring-belt precision machining composite boring tool assembly for heavy truck engine cylinder heads and its application, through the machine tool spindle tensioning mechanism pulling the lasing rod, drives the locking tube to move axially, forcing the locking ball to retract radially and then lock into the limiting ring groove of the connecting plate, realizing the rapid locking and releasing of the tool holder module and the machining module, convenient module replacement, and high repeatability positioning accuracy.

[0020] 2. This composite boring tool assembly for finishing ring-belt machining of heavy-duty truck engine cylinder heads and its application utilizes the axial movement of the Latin arm, with the cooperation of a lever and guide groove driving the rotating tube to rotate. The rotating tube then drives the water supply pipe to rotate relative to the fixed pipe through the cooperation of a positioning block and positioning groove. This automatically switches the coolant outlet between the main hole boring and ring-belt chamfering processes, ensuring an effective coolant supply to the cutting edge in each process and extending tool life. The entire coolant channel switching is automatically driven by the tensioning force of the machine tool's tensioning mechanism, requiring no additional drive device. It features a compact structure and simple operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a cross-sectional schematic diagram of the tool holder module in this invention; Figure 4 This is a cross-sectional side view of the tool holder module in this invention; Figure 5 This is one of the partial structural cross-sectional diagrams of the tool holder module in this invention; Figure 6 This is the second sectional view of a portion of the structure of the tool holder module in this invention; Figure 7 This is a schematic diagram of the processing module in this invention; Figure 8 This is a cross-sectional schematic diagram of the processing module in this invention; Figure 9 This is one of the cross-sectional diagrams of the blade body in this invention; Figure 10 This is the second cross-sectional view of the blade body in this invention; Figure 11 This is a schematic diagram of the structure of the fixed tube in this invention; Figure 12 This is a cross-sectional schematic diagram of the fixed tube structure in this invention; Figure 13 This is one of the structural schematic diagrams of the water supply pipe in this invention; Figure 14 This is the second schematic diagram of the water supply pipe in this invention; Explanation of reference numerals in the attached figures: 100. Tool holder module; 110. Handle body; 111. Notch; 120. Cover sleeve; 130. Locking ball; 140. Latin joint; 141. Through hole; 150. Locking tube; 160. Lever; 170. Rotary tube; 171. Guide groove; 172. Positioning block; 180. Spring; 200. Machining module; 210. Tool body; 211. Fixing hole; 212. First water supply hole; 213. Second water supply hole; 220. Connecting plate; 221. Limiting ring groove; 230. Fixing pipe; 231. Water channel; 232. Connecting hole; 240. Water supply pipe; 241. Water channel; 242. Pipe wall through hole; 243. Positioning groove; 250. First cutting tool; 260. Second cutting tool. Detailed Implementation

[0022] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] Please see Figures 1-6 As shown, this embodiment provides a technical solution: A composite boring tool assembly for finishing rings in heavy-duty truck engine cylinder heads is used in the integrated machining of the main hole boring and ring chamfering of the ring holes in the engine cylinder head. It includes a tool holder module 100 and a machining module 200. The tool holder module 100 is used to connect to the machine tool spindle, and the machining module 200 is detachably mounted on the tool holder module 100.

[0024] Furthermore, the tool holder module 100 includes a handle body 110, a cover cylinder 120 fixed to the end of the tool holder module 100, a plurality of locking beads 130 embedded in the cylinder wall of the cover cylinder 120, a axially movable lasing rod 140 passing through the tool holder module 100, a locking tube 150 fixed to the end of the lasing rod 140, and a rotating tube 170 rotatably disposed at the axis of the cover cylinder 120. A spring 180 is sleeved on the outside of the lasing rod 140, and a through hole 141 for introducing coolant is opened through the axis of the lasing rod 140.

[0025] Furthermore, a notch 111 for positioning with the machine tool spindle is provided on the outer wall of the shank 110, and a stepped hole for axial movement of the locking tube 150 is provided at the end of the shank 110. During the ring processing, the locking tube 150 moves to the second position, and its end face abuts against the stepped surface of the stepped hole.

[0026] Furthermore, the outer wall of the rotating tube 170 is provided with several guide grooves 171, which are composed of a straight axial groove and a spiral groove connected end to end; several levers 160 are snapped and fixed on the outer wall of the Latin tube 140, and the ends of the levers 160 are slidably fitted in the guide grooves 171. The rotating tube 170 is axially limited relative to the cover tube 120 by a retaining ring. The rotating tube 170 can only rotate around its own axis and cannot move axially.

[0027] Furthermore, the two ends of the spring 180 abut against the wall of the stepped hole at the end of the handle 110 and the outer wall of the locking tube 150, respectively, to push the lasing tube 140 and the locking tube 150 back to their original positions after the machine tool tension is released.

[0028] Furthermore, the machine tool spindle tensioning mechanism is activated, pulling the lasing tube 140 to move axially backward. The lasing tube 140 drives the locking tube 150 to move synchronously to the first position. The end of the locking tube 150 presses the locking ball 130, realizing the rigid locking and fixing of the machining module 200 and the tool holder module 100. At this time, although the lasing tube 140 still has room to continue axial movement, with the high-strength support of the spring 180, the tool holder module 100 is securely fixed to the machine tool spindle, thereby meeting the rigidity requirements of hole drilling.

[0029] Furthermore, after the main hole boring is completed, the machine tool spindle tensioning mechanism continues to pull the lasing tube 140 to move further axially. The lasing tube 140 drives the locking tube 150 to move to the second position. At this time, the end face of the locking tube 150 abuts against the stepped surface of the stepped hole at the end of the shank 110, providing higher rigidity support for the chamfering of the ring. During the continued axial movement of the lasing tube 140, the lever 160 enters the helical groove section from the axial straight groove section of the guide groove 171. Since the rotating tube 170 is axially fixed, the sliding of the lever 160 in the helical groove forces the rotating tube 170 to rotate around its own axis.

[0030] In the above configuration, the axial movement of the 140 and the locking tube 150, combined with the engagement of the locking ball 130 and the limiting ring groove 221, achieves rigid locking of the tool holder module 100 and the machining module 200, and the cooperation of the lever 160 and the guide groove 171 provides a driving basis for subsequent coolant passage switching.

[0031] Please see Figures 7-14 As shown, in this embodiment, the processing module 200 includes a cutter body 210, a connecting disc 220 fixedly connected to the end of the cutter body 210 by bolts, a fixing tube 230 tightly fitted inside the cutter body 210, and a water supply pipe 240 located at the axis of the processing module 200 and with one end fitted outside the end of the rotating tube 170; the end and side of the processing module 200 are respectively equipped with a first cutting tool 250 for boring the main hole and a second cutting tool 260 for chamfering the ring, and the water supply pipe 240 rotates synchronously with the rotating tube 170.

[0032] Furthermore, during the drilling operation, the Latin tube 140 moves axially under the tension of the machine tool, causing the locking tube 150 to move to the first position. This forces the locking ball 130 to retract radially inward, locking and fixing the machining module 200. At this time, the through hole 141 inside the Latin tube 140 is connected to the water passage inside the machining module 200 via the water supply pipe 240, and coolant is sprayed onto the working surface of the first blade 250. During the ring machining, the Latin tube 140 continues to move axially, causing the locking tube 150 to move to the second position and driving the rotating tube 170 to rotate the water supply pipe 240 to switch the coolant passage. This connects the through hole 141 to another water passage inside the machining module 200 via the water supply pipe 240, and coolant is sprayed onto the working surface of the second blade 260.

[0033] Furthermore, the blade body 210 has a fixing hole 211 for placing the fixing tube 230 inside. A first water supply hole 212 communicating with the fixing hole 211 is opened through the axis of the blade body 210. Several second water supply holes 213 are opened through the side walls at both ends of the fixing hole 211. The first water supply hole 212 faces the working surface of the first blade 250, and the second water supply holes 213 face the working surface of the second blade 260.

[0034] Furthermore, a limiting ring groove 221 adapted to the spherical surface of the locking ball 130 is provided on the outer wall of the connecting plate 220, and the locking ball 130 forms surface contact when it is inserted into the limiting ring groove 221.

[0035] Furthermore, the water supply pipe 240 is sleeved inside the fixed pipe 230 and can rotate relative to the fixed pipe 230; a water passage groove 231 is opened on the outer wall of the end of the fixed pipe 230, and several sets of centrally symmetrically arranged connecting holes 232 are opened on the pipe wall of the fixed pipe 230; a water supply groove 241 is opened on the outer wall of the end of the water supply pipe 240, and several pipe wall through holes 242 are opened through the pipe walls at both ends of the water supply pipe 240; a positioning block 172 is integrally formed on the end of the rotating pipe 170 away from the locking pipe 150; a positioning groove 243 adapted to the positioning block 172 is opened on the end face of the water supply pipe 240 facing the rotating pipe 170; the positioning block 172 is embedded in the positioning groove 243 to realize the circumferential linkage between the rotating pipe 170 and the water supply pipe 240.

[0036] Furthermore, both the water channel 231 and the water supply channel 241 are two centrally symmetrical fan-shaped channels. During the drilling operation, the water channel 231 and the water supply channel 241 overlap to form a coolant passage leading to the first water supply hole 212. At this time, the pipe wall through hole 242 and the connecting hole 232 are circumferentially offset. During the ring processing, after the water supply pipe 240 is rotated, the water channel 231 and the water supply channel 241 are circumferentially offset, and the pipe wall through hole 242 and the connecting hole 232 are circumferentially aligned to form a coolant passage leading to the second water supply hole 213.

[0037] Furthermore, the first insert 250 is fixedly mounted on the axial end face of the cutter body 210 by screws and is used for boring the main hole of the cylinder head ring belt hole; the second insert 260 is fixedly mounted on the side of the cutter body 210 by screws and is used for chamfering of the cylinder head ring belt.

[0038] Furthermore, after the machining module 200 and the tool holder module 100 are rigidly locked and fixed, the axial displacement of the Latin 140 is small, and the lever 160 only slides along the axial straight groove section of the guide groove 171, and the rotary tube 170 does not rotate; at this time, the water supply groove 241 on the water supply pipe 240 and the water passage groove 231 on the fixed pipe 230 overlap in the circumferential direction to form a coolant passage leading to the first water supply hole 212; at the same time, the pipe wall through hole 242 on the pipe wall of the water supply pipe 240 and the connecting hole 232 on the fixed pipe 230 are offset in the circumferential direction, and the second water supply hole 213 has no coolant supply.

[0039] Furthermore, the coolant supply is activated, and the coolant enters from the center of the machine tool spindle, passing sequentially through the through hole 141 of the Latin 140, the inner cavity of the rotary pipe 170, the inner cavity of the water supply pipe 240, the water supply tank 241, and the water passage tank 231, before being sprayed out from the first water supply hole 212, directly acting on the working surface of the first cutting tool 250 to effectively cool the main hole boring; at the same time, the machine tool spindle drives the entire boring tool assembly to rotate, and the first cutting tool 250 completes the main hole boring of the cylinder head ring with holes.

[0040] Furthermore, as the Latin tube 140 continues to move axially, the lever 160 enters the spiral groove section from the axial straight groove section of the guide groove 171; since the rotating tube 170 is axially fixed, the sliding of the lever 160 in the spiral groove forces the rotating tube 170 to rotate around its own axis; the rotating tube 170 drives the water supply pipe 240 to rotate relative to the fixed pipe 230 through the cooperation of the positioning block 172 and the positioning groove 243, thereby realizing the switching of the coolant passage.

[0041] Furthermore, specifically, after the water supply pipe 240 is rotated, the water supply trough 241 and the water passage trough 231 are completely misaligned in the circumferential direction, and the coolant passage of the first water supply hole 212 is cut off; at the same time, the pipe wall through hole 242 on the pipe wall of the water supply pipe 240 and the connecting hole 232 on the fixed pipe 230 are aligned in the circumferential direction to form a coolant passage to the second water supply hole 213.

[0042] Furthermore, the coolant flows from the inside of the water supply pipe 240 through the pipe wall through hole 242 and the connecting hole 232, and then is sprayed out through the second water supply hole 213, acting on the working surface of the second cutting tool 260 to effectively cool the ring chamfering process.

[0043] In the above setup, the water supply pipe 240 is rotated relative to the fixed pipe 230 by the rotating pipe 170, so that the water supply tank 241 and the water passage tank 231 are misaligned and the pipe wall through hole 242 and the connecting hole 232 are aligned, so as to realize the automatic switching of coolant from the first water supply hole 212 to the second water supply hole 213, and meet the cooling needs of different processes.

[0044] When using the ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads of the present invention, the following steps are included: First, align the connecting plate 220 of the processing module 200 with and insert it into the cover cylinder 120 of the tool holder module 100, so that the positioning block 172 at the end of the rotating pipe 170 is embedded in the positioning groove 243 on the end face of the water supply pipe 240, thus completing the initial docking between the tool holder module 100 and the processing module 200. Next, the machine tool spindle tensioning mechanism is activated, pulling the Latin 140 to move axially backward. The Latin 140 drives the locking tube 150 to move synchronously to the first position. The end of the locking tube 150 squeezes the locking ball 130, causing the locking ball 130 to retract radially and then be inserted into the limiting ring groove 221 on the outer wall of the connecting plate 220, thereby achieving rigid locking and fixing of the machining module 200 and the tool holder module 100. During this process, the axial displacement of the Latin tube 140 is small, and the lever 160 only slides along the axial straight groove section of the guide groove 171, while the rotating tube 170 does not rotate. At this time, the water supply groove 241 on the water supply pipe 240 and the water passage groove 231 on the fixed pipe 230 overlap in the circumferential direction, forming a coolant passage leading to the first water supply hole 212. Meanwhile, the pipe wall through hole 242 on the wall of the water supply pipe 240 and the connecting hole 232 on the fixed pipe 230 are offset in the circumferential direction, and the second water supply hole 213 is not supplied with coolant. Subsequently, the coolant supply is activated. The coolant enters from the center of the machine tool spindle, passes sequentially through the through hole 141 of the Latin 140, the inner cavity of the rotary pipe 170, the inner cavity of the water supply pipe 240, the water supply tank 241, and the water passage tank 231, and is then sprayed out from the first water supply hole 212, directly acting on the working surface of the first cutting tool 250 to effectively cool the main hole boring. At the same time, the machine tool spindle drives the entire boring tool assembly to rotate, and the first cutting tool 250 completes the main hole boring of the cylinder head ring with holes. After the main hole boring is completed, the machine tool spindle tensioning mechanism continues to pull the Latin 140 to move further axially. The Latin 140 drives the locking tube 150 to move to the second position. At this time, the end face of the locking tube 150 abuts against the stepped surface of the stepped hole at the end of the shank 110, providing higher rigidity support for the ring chamfering process. As the Latin tube 140 continues to move axially, the lever 160 enters the spiral groove section from the axial straight groove section of the guide groove 171; since the rotating tube 170 is axially fixed, the sliding of the lever 160 in the spiral groove forces the rotating tube 170 to rotate around its own axis; the rotating tube 170 drives the water supply pipe 240 to rotate relative to the fixed pipe 230 through the cooperation of the positioning block 172 and the positioning groove 243, thereby realizing the switching of the coolant passage. Specifically, after the water supply pipe 240 is rotated, the water supply tank 241 and the water passage tank 231 are completely misaligned in the circumferential direction, and the coolant passage of the first water supply hole 212 is cut off; at the same time, the pipe wall through hole 242 on the wall of the water supply pipe 240 and the connecting hole 232 on the fixed pipe 230 are aligned in the circumferential direction to form a coolant passage to the second water supply hole 213. The coolant flows from the inside of the water supply pipe 240 through the pipe wall through hole 242 and the connecting hole 232, and then sprays out through the second water supply hole 213, acting on the working surface of the second cutting tool 260 to effectively cool the ring belt chamfering process; at the same time, the machine tool spindle drives the boring tool assembly to rotate, and the second cutting tool 260 completes the chamfering process of the cylinder head ring belt; After all machining is completed, the machine tool spindle tensioning mechanism releases the tension force, and the elastic force of the spring 180 pushes the locking tube 150 and the lasing tube 140 forward to reset; the lever 160 moves in the opposite direction along the guide groove 171, driving the rotating tube 170 and the water supply tube 240 to rotate in the opposite direction and return to the initial state; finally, the machining module 200 is removed from the cover sleeve 120 of the tool holder module 100, and disassembly is completed.

[0045] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A composite boring tool assembly for finishing ring belts in heavy-duty truck engine cylinder heads, comprising a tool holder module and a machining module, wherein the tool holder module is used to connect to a machine tool spindle, and the machining module is detachably mounted on the tool holder module; the end and side of the machining module are respectively provided with a first insert for boring the main hole and a second insert for chamfering the ring belt, characterized in that: The tool holder module includes a cover tube fixed to the end of the tool holder module, several locking beads embedded in the wall of the cover tube, a axially movable lasing rod passing through the tool holder module, a locking tube fixed to the end of the lasing rod, and a rotating tube rotatably disposed at the center of the cover tube. A through hole for coolant to pass through is provided at the center of the lasing rod. The processing module includes a water supply pipe disposed at its axis and one end sleeved on the outside of the end of the rotating pipe, the water supply pipe rotating synchronously with the rotating pipe; During the drilling operation, the lasing plate moves axially under the tension of the machine tool, which drives the locking tube to the first position, forcing the locking ball to retract radially and lock the processing module in place. At this time, the through hole in the lasing plate is connected to the water passage inside the processing module through the water supply pipe, and the coolant is sprayed onto the working surface of the first blade. During the ring belt machining, the Latin tube continues to move axially, driving the locking tube to the second position and driving the rotating tube to rotate the water supply pipe to switch the coolant passage, so that the through hole is connected to another water passage inside the machining module through the water supply pipe, and the coolant is sprayed onto the working surface of the second blade.

2. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 1, characterized in that: The outer wall of the rotating tube is provided with several guide grooves, which are composed of a straight axial groove and a spiral groove connected end to end; several levers are snapped and fixed on the outer wall of the rotating tube, and the ends of the levers are slidably engaged in the guide grooves. The rotating tube is axially limited relative to the cover cylinder by a retaining ring, and the rotating tube can only rotate around its own axis and cannot move axially.

3. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 2, characterized in that: The tool holder module also includes a handle body. The outer wall of the handle body has a notch for positioning with the machine tool spindle. The end of the handle body has a stepped hole for the axial movement of the locking tube. During the ring machining, the locking tube moves to the second position, and its end face abuts against the stepped surface of the stepped hole.

4. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 3, characterized in that: A spring is fitted on the outer side of the lasing arm, and the two ends of the spring abut against the wall of the stepped hole at the end of the handle and the outer wall of the locking tube, respectively, to push the lasing arm and the locking tube back to their original positions after the machine tool tension is released.

5. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 4, characterized in that: The processing module also includes a cutter body, a connecting plate fixedly connected to the end of the cutter body by bolts, and a fixing tube tightly fitted inside the cutter body. The outer wall of the connecting plate is provided with a limiting ring groove that matches the spherical surface of the locking ball. When the locking ball is inserted into the limiting ring groove, it forms a surface contact.

6. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 5, characterized in that: The blade body has a fixing hole for placing a fixing tube inside. A first water supply hole communicating with the fixing hole is opened through the axis of the blade body. Several second water supply holes are opened through the side walls at both ends of the fixing hole. The first water supply hole faces the working surface of the first blade, and the second water supply holes face the working surface of the second blade.

7. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 6, characterized in that: The water supply pipe is sleeved inside the fixed pipe and can rotate relative to the fixed pipe; a water passage groove is opened on the outer wall of the end of the fixed pipe, and several sets of centrally symmetrically arranged connecting holes are opened on the pipe wall of the fixed pipe; a water supply groove is opened on the outer wall of the end of the water supply pipe, and several pipe wall through holes are opened through both ends of the water supply pipe; a positioning block is integrally formed on the end of the rotating pipe away from the locking pipe; a positioning groove adapted to the positioning block is opened on the end face of the water supply pipe facing the rotating pipe; the positioning block is embedded in the positioning groove to realize the circumferential linkage between the rotating pipe and the water supply pipe.

8. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 7, characterized in that: Both the water passage and the water supply passage are two centrally symmetrical fan-shaped passages. During the drilling operation, the water passage and the water supply passage overlap to form a coolant passage leading to the first water supply hole. At this time, the pipe wall through hole and the connecting hole are circumferentially offset. During the ring processing, after the water supply pipe is rotated, the water passage and the water supply passage are circumferentially offset, and the pipe wall through hole and the connecting hole are circumferentially aligned to form a coolant passage leading to the second water supply hole.

9. The ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads according to claim 8, characterized in that: The first insert is fixedly mounted on the axial end face of the tool body with screws and is used for boring the main hole of the cylinder head ring belt; the second insert is fixedly mounted on the side of the tool body with screws and is used for chamfering of the cylinder head ring belt.

10. An application of a ring-belt finishing composite boring tool assembly for heavy-duty truck engine cylinder heads, as described in claim 9, characterized in that: It is used in the integrated machining of the main hole boring and chamfering of the ring hole in the engine cylinder head.

Images