A boring device and method for deep hole machining of a turbocharger
By incorporating support and adjustment components within the boring bar, uniform support and flexible contact are provided, thus resolving the chatter problem in deep hole machining of turbochargers using cantilever boring bar structures and achieving high-precision machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FENGCHENG MINGXI MACHINERY MANUFACTURING CO LTD
- Filing Date
- 2026-04-22
- Publication Date
- 2026-05-29
AI Technical Summary
The existing cantilever boring bar structure lacks auxiliary support in the rough boring of deep holes in turbochargers, resulting in cutting chatter and insufficient machining accuracy, which affects the yield of finished products.
A boring device was designed, which includes a support component and an adjustment component inside the boring bar. Through the cooperation of multiple telescopic holes, guide blocks and contact cylinders, it provides uniform support and flexible contact, suppresses cutting chatter, and realizes active drainage of chips and coolant through reverse spiral grooves and reflective guide grooves.
It effectively suppresses radial runout and cutting chatter at the feed end of the boring bar, ensuring the roundness and straightness of the deep hole, reserving a uniform machining allowance, and improving machining accuracy and stability.
Smart Images
Figure CN122099401A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of turbocharger machining technology, specifically to a boring device and method for deep hole machining of turbochargers. Background Technology
[0002] Turbochargers are core components for improving the power density of internal combustion engines, optimizing fuel economy, and reducing exhaust emissions. They are widely used in internal combustion engine systems across various fields. The intermediate body, as the core load-bearing component of the turbocharger, has a deep hole structure inside that is crucial for ensuring the high-speed operation stability of the turbine rotor system and the smooth circulation of lubricating oil. The diameter accuracy, shape tolerance, and axial straightness of these deep holes directly determine the overall assembly accuracy, operational reliability, and service life of the turbocharger. In the industry, the machining of such deep holes generally adopts a multi-process sequential process. Among them, the rough boring process is the front-end basic process. Its core function is to quickly remove the casting allowance of the blank, leaving a uniform and stable machining allowance for the subsequent finishing process. It is the core foundation that determines the production efficiency and finished product qualification rate of the entire machining line. The rough boring process usually adopts a cutting condition with large allowance and large feed. Under this condition, the cutting load is large and the cutting force fluctuates violently, which places extremely high demands on the overall rigidity, vibration resistance and operational stability of the machining equipment. At present, the industry's common core equipment for rough boring of the above-mentioned deep holes in turbochargers is a cantilevered coaxial boring bar structure matched with a horizontal boring machine. By optimizing the main structure of the boring bar and using high-rigidity materials, the overall bending rigidity of the boring bar is improved, thereby suppressing radial runout and cutting chatter problems during the machining process. In the mass production machining of deep hole rough boring of turbochargers, the aforementioned cantilever boring bar structure provides rigid support only through the connection end between the boring bar and the boring machine spindle. The feed end of the boring bar extending into the workpiece hole is completely cantilevered without any auxiliary support structure. The large allowance and large feed conditions of the rough boring process will cause the cutting tool to be subjected to a violently fluctuating unilateral radial cutting force. This cutting force will directly cause the feed end of the cantilevered boring bar to generate radial runout, which will then cause continuous cutting chatter. Ultimately, this will result in the roundness and straightness of the hole after rough boring being seriously out of tolerance, making it impossible to reserve a uniform and stable machining allowance for subsequent finishing, directly affecting the machining qualification rate of the finished parts. Summary of the Invention
[0003] The purpose of this invention is to provide a boring device and method for deep hole machining of turbochargers.
[0004] The objective of this invention is achieved through the following technical solution: a boring device and method for deep hole machining of turbochargers, comprising a boring machine body, a boring bar detachably connected to the surface of the boring machine body, and a boring tool detachably connected to the boring bar; The boring bar is provided with a support auxiliary mechanism for supporting the boring bar, and the support auxiliary mechanism consists of a support component and an adjustment component; The support assembly includes multiple telescopic holes formed on the surface of the boring bar, a guide block slidably connected in the telescopic holes, a contact cylinder rotatably connected in the guide block, a reverse spiral groove formed on the surface of the contact cylinder, a reflective guide groove formed on the surface of the contact cylinder, and a first elastic element disposed between the guide block and the boring bar. The reverse spiral groove rotates in the opposite direction to the working rotation direction of the boring bar, and the opening direction of the reflective guide groove faces the opposite side of the feed direction of the boring machine body; The adjustment component is used to adjust the length of the support component extending out of the boring bar surface.
[0005] A gap is provided between the telescopic hole and the guide block. The support assembly also includes a plurality of second elastic elements fixedly connected to the inner wall of the telescopic hole, a pressure plate fixedly connected to one end of the second elastic elements, a triangular groove plate fixedly connected to the inner wall of the telescopic hole, and a triangular protrusion plate fixedly connected to the surface of the guide block.
[0006] The surface of the pressure plate is in contact with the surface of the guide block under the elastic force of the second elastic element, and the surface of the triangular protrusion plate cooperates with the inner cavity of the triangular groove plate to realize the positioning of the guide block in the telescopic hole.
[0007] The adjustment assembly includes a frustum extrusion plate slidably connected to the inner drum of the boring bar, a plurality of third elastic elements fixedly connected to the frustum extrusion plate, a floating plate fixedly connected to one end of the third elastic elements, a plurality of first triangular protrusions fixedly connected to the surface of the frustum extrusion plate, and a plurality of second triangular protrusions fixedly connected to one end of the guide block, wherein one end of the second triangular protrusion is in contact with the surface of the floating plate.
[0008] The surface of the boring bar is provided with a relief groove, and a connector is slidably connected to the inner cavity of the relief groove. One end of the connector is fixedly connected to the surface of the frustum extrusion plate, and the end of the connector away from the frustum extrusion plate extends to the outside of the boring bar. The connector fits against the surface of the relief groove, restricting the sliding direction of the connector.
[0009] The inclined surface of the first triangular protrusion is adapted to the inclined surface of the second triangular protrusion; when the frustum extrusion plate slides along the boring bar axis, the first triangular protrusion extrudes the second triangular protrusion and drives the guide block to slide radially along the telescopic hole; under the reset action of the first elastic element, the guide block reciprocates radially along the telescopic hole and causes the iron filings in the reverse spiral groove to fall off.
[0010] The contact cylinder can rotate freely around its own axis. The outer circular surface of the contact cylinder is adapted to the inner wall of the deep hole of the turbocharger. The multiple telescopic holes are evenly distributed along the circumference of the boring bar, and the positions of the telescopic holes are staggered from the circumferential position of the boring tool.
[0011] S1. Place the turbocharger on the boring machine body, connect the boring bar to the spindle of the boring machine body, operate the connecting piece to drive the axial movement of the rotary table extrusion plate, so that the guide block slides radially along the telescopic hole, and drives the contact cylinder to extend out of the boring bar surface; S2. The contact cylinder contacts the inner wall of the deep hole of the turbocharger. The inner wall of the deep hole squeezes the contact cylinder, causing the guide block to compress the third elastic element through the second triangular protrusion, thereby achieving radial contraction of the contact cylinder. S3. The boring bar rotates, which drives the contact cylinder to rotate. The reverse spiral groove conveys the coolant and iron chips to the opposite side of the feed direction of the boring machine body, and the reflective guide groove reflects the coolant and iron chips out. S4. After the contact cylinder is separated from the inner wall of the deep hole and squeezed, the third elastic element pushes the floating plate to reset, which drives the guide block to move radially. The triangular protrusion plate separates from and engages with the triangular groove plate, causing the guide block to vibrate and drive the iron filings in the reverse spiral groove to fall off.
[0012] Compared with the prior art, the advantages of the present invention are as follows: 1. By setting up support and adjustment components, the defect of existing cantilever boring bars without auxiliary support structures is overcome; the connecting piece drives the axial movement of the frustum extrusion plate, and the frustum extrusion plate pushes the guide block to slide radially through the first triangular protrusion. The guide block drives the contact cylinder to extend out of the boring bar surface, so that the outer circular surface of the contact cylinder contacts the inner wall of the deep hole of the turbocharger; multiple telescopic holes are evenly distributed along the circumference of the boring bar, and the positions of the telescopic holes are staggered from the circumferential position of the boring tool. Multiple support components form uniform support points in the circumferential direction of the boring bar, so that the boring bar remains centered in the deep hole; this auxiliary support structure effectively suppresses the radial runout and cutting chatter of the boring bar feed end caused by the unilateral radial cutting force under the large allowance and large feed conditions during rough boring, ensuring the roundness and straightness of the hole after rough boring, and reserving a uniform and stable machining allowance for subsequent finishing.
[0013] 2. By setting a third elastic element and a floating plate, one end of the second triangular protrusion contacts the surface of the floating plate, achieving flexible contact between the contact cylinder and the inner wall of the deep hole. When the contact cylinder contacts the inner wall of the deep hole, the inner wall of the deep hole squeezes the contact cylinder, and the contact cylinder squeezes the floating plate through the guide block and the second triangular protrusion. The floating plate compresses the third elastic element, causing the guide block to contract inward along the radial direction of the telescopic hole. This flexible contraction structure avoids rigid contact between the contact cylinder and the inner wall of the deep hole, preventing damage to the inner wall of the deep hole, while ensuring the stability of the support.
[0014] The 501 achieves active discharge of chips and coolant through the reverse spiral groove and reflective guide groove on the surface of the contact cylinder. The spiral groove rotates in the opposite direction to the working rotation direction of the boring bar. When the boring bar rotates, the reverse spiral groove generates axial thrust, which transports coolant and iron chips to the opposite side of the feed direction of the boring machine body. The opening direction of the reflective guide groove is opposite to the feed direction of the boring machine body, which reflects and discharges coolant and iron chips, preventing coolant and iron chips from accumulating between the contact cylinder and the inner wall of the deep hole, ensuring the cleanliness of the support surface and the normal rolling of the contact cylinder. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the engagement of the boring bar and the boring tool according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the boring bar according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cooperation between the guide block and the telescopic hole in an embodiment of the present invention; Figure 5 This is an exploded view of the auxiliary support mechanism and boring bar according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the cooperation between the support component and the adjustment component in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the support component according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the adjustment component according to an embodiment of the present invention.
[0016] Labeling Explanation: 1. Boring machine body; 101. Boring rod; 102. Boring tool; 2. Telescopic hole; 201. Guide block; 202. Contact cylinder; 203. Reverse spiral groove; 204. Reflective guide groove; 205. First elastic element; 3. Second elastic element; 301. Pressure plate; 302. Triangular groove plate; 303. Triangular protrusion plate; 4. Frustum extrusion plate; 401. Third elastic element; 402. Floating plate; 403. First triangular protrusion; 404. Second triangular protrusion; 5. Relief groove; 501. Connecting part. Detailed Implementation
[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figure 1-8 The diagram shows an embodiment of a boring device and method for deep hole machining of a turbocharger provided by the present invention, including a boring machine body 1, a boring bar 101 detachably connected to the surface of the boring machine body 1, and a boring tool 102 detachably connected to the boring bar 101. The boring bar 101 is provided with a support auxiliary mechanism for supporting the boring bar 101. The support auxiliary mechanism consists of a support component and an adjustment component. The support assembly includes multiple telescopic holes 2 formed on the surface of the boring bar 101, a guide block 201 slidably connected to the telescopic holes 2, a contact cylinder 202 rotatably connected to the guide block 201, a reverse spiral groove 203 formed on the surface of the contact cylinder 202, a reflective guide groove 204 formed on the surface of the contact cylinder 202, and a first elastic member 205 disposed between the guide block 201 and the boring bar 101; The reverse spiral groove 203 rotates in the opposite direction to the working rotation direction of the boring bar 101, and the opening direction of the reflective guide groove 204 faces the opposite side of the feed direction of the boring machine body 1. The adjustment component is used to adjust the length of the support component extending out of the surface of the boring bar 101.
[0018] A gap is provided between the telescopic hole 2 and the guide block 201. The support assembly also includes a plurality of second elastic elements 3 fixedly connected to the inner wall of the telescopic hole 2, a pressure plate 301 fixedly connected to one end of the second elastic element 3, a triangular groove plate 302 fixedly connected to the inner wall of the telescopic hole 2, and a triangular protrusion plate 303 fixedly connected to the surface of the guide block 201.
[0019] The surface of the pressure plate 301 is in contact with the surface of the guide block 201 under the elastic force of the second elastic member 3, and the surface of the triangular protrusion plate 303 cooperates with the inner cavity of the triangular groove plate 302 to realize the positioning of the guide block 201 in the telescopic hole 2.
[0020] The adjustment assembly includes a frustum extrusion plate 4 slidably connected to the inner frustum extrusion plate 4 of the boring bar 101, a plurality of third elastic elements 401 fixedly connected to the frustum extrusion plate 4, a floating plate 402 fixedly connected to one end of the third elastic elements 401, a plurality of first triangular protrusions 403 fixedly connected to the surface of the frustum extrusion plate 4, and a plurality of second triangular protrusions 404 fixedly connected to one end of the guide block 201, with one end of the second triangular protrusions 404 in contact with the surface of the floating plate 402.
[0021] The surface of the boring bar 101 is provided with a relief groove 5. A connector 501 is slidably connected to the inner cavity of the relief groove 5. One end of the connector 501 is fixedly connected to the surface of the frustum extrusion plate 4. The end of the connector 501 away from the frustum extrusion plate 4 extends to the outside of the boring bar 101. The connector 501 fits against the surface of the relief groove 5, restricting the sliding direction of the connector 501.
[0022] The inclined surface of the first triangular protrusion 403 and the inclined surface of the second triangular protrusion 404 are adapted to each other; when the frustum extrusion plate 4 slides along the axial direction of the boring bar 101, the first triangular protrusion 403 extrudes the second triangular protrusion 404 and drives the guide block 201 to slide radially along the telescopic hole 2; under the reset action of the first elastic element 205, the guide block 201 reciprocates radially along the telescopic hole 2 and causes the iron filings in the reverse spiral groove 203 to fall off.
[0023] The contact cylinder 202 can rotate freely around its own axis. The outer circular surface of the contact cylinder 202 is adapted to the inner wall of the deep hole of the turbocharger. Multiple telescopic holes 2 are evenly distributed along the circumference of the boring bar 101, and the positions of the telescopic holes 2 are offset from the circumferential position of the boring bar 102.
[0024] S1. Place the turbocharger on the boring machine body 1, connect the boring bar 101 to the spindle of the boring machine body 1, operate the connecting piece 501 to drive the axial movement of the frustum extrusion plate 4, so that the guide block 201 slides radially along the telescopic hole 2, and drives the contact cylinder 202 to extend out of the surface of the boring bar 101. S2. The contact cylinder 202 contacts the inner wall of the deep hole of the turbocharger. The inner wall of the deep hole squeezes the contact cylinder 202, causing the guide block 201 to compress the third elastic element 401 through the second triangular protrusion 404, thereby achieving radial contraction of the contact cylinder 202. S3. The boring bar 101 rotates, which drives the contact cylinder 202 to rotate. The reverse spiral groove 203 conveys the coolant and iron chips to the opposite side of the feed direction of the boring machine body 1. The reflective guide groove 204 reflects and discharges the coolant and iron chips. S4. After the contact cylinder 202 is separated from the inner wall of the deep hole and squeezed, the third elastic element 401 pushes the floating plate 402 to reset, which drives the guide block 201 to move radially. The triangular protrusion plate 303 separates from and engages with the triangular groove plate 302, causing the guide block 201 to vibrate and drive the iron filings in the reverse spiral groove 203 to fall off.
[0025] The working principle of this device is as follows: When performing deep hole machining, the turbocharger is first placed on the boring machine body 1. The boring bar 101 is connected to the spindle of the boring machine body 1. The connecting part 501 consists of a screw and a nut.
[0026] When it is necessary to adjust the length of the support assembly extending beyond the surface of the boring bar 101, the operator loosens the nut of the connector 501, releasing the locking state between the connector 501 and the boring bar 101. The operator pushes the screw of the connector 501, and the connector 501 slides along the relief groove 5. The connector 501 drives the frustum pressing plate 4 to move axially along the boring bar 101. When the frustum pressing plate 4 moves, the first triangular protrusion 403 fixed to the surface of the frustum pressing plate 4 moves together with the frustum pressing plate 4. The inclined surface of the first triangular protrusion 403 contacts the inclined surface of the second triangular protrusion 404 fixed to one end of the guide block 201 and generates relative sliding. The first triangular protrusion 403 applies radial pressing force to the second triangular protrusion 404, pushing the guide block 201 to slide radially outward along the telescopic hole 2. The guide block 201 drives the contact cylinder 202 rotatably connected inside it to extend beyond the surface of the boring bar 101.
[0027] When the frustum pressing plate 4 moves in the opposite direction, the pressing force of the first triangular protrusion 403 on the second triangular protrusion 404 decreases. The first elastic element 205 located between the guide block 201 and the boring bar 101 is in a compressed state, and the restoring force of the first elastic element 205 pushes the guide block 201 to slide radially inward along the telescopic hole 2. The guide block 201 drives the contact cylinder 202 to retract to the surface of the boring bar 101.
[0028] During the movement of the frustum extrusion plate 4, the third elastic element 401 fixedly connected inside the frustum extrusion plate 4 and the floating plate 402 fixedly connected to one end of the third elastic element 401 work together. One end of the second triangular protrusion 404 contacts the surface of the floating plate 402. When the frustum extrusion plate 4 moves, the third elastic element 401 applies a buffering force to the second triangular protrusion 404 through the floating plate 402, keeping the frustum extrusion plate 4 in contact with the guide block 201.
[0029] When the contact cylinder 202 extends and contacts the inner wall of the deep bore of the turbocharger, the inner wall of the deep bore applies a radial compressive force to the contact cylinder 202. The contact cylinder 202 transmits this compressive force to the guide block 201. The guide block 201 compresses the floating plate 402 through the second triangular protrusion 404. After being compressed, the floating plate 402 compresses the third elastic element 401, causing the guide block 201 to retract radially inward along the telescopic hole 2. This retraction action avoids rigid contact between the contact cylinder 202 and the inner wall of the deep bore, preventing damage to the inner wall of the deep bore.
[0030] When the contact cylinder 202 is no longer compressed by the inner wall of the deep hole, the reset force of the third elastic element 401 pushes the floating plate 402 to move outward. The floating plate 402 pushes the guide block 201 to reset radially outward along the telescopic hole 2 via the second triangular protrusion 404.
[0031] During the resetting process of guide block 201, the triangular protrusion 303 fixedly connected to the surface of guide block 201 and the triangular groove 302 fixedly connected to the inner wall of telescopic hole 2 undergo relative movement. The surface of triangular protrusion 303 disengages from the inner cavity of triangular groove 302, and then re-engages as guide block 201 continues to move. The disengagement and engagement of triangular protrusion 303 and triangular groove 302 causes guide block 201 to vibrate in the up-down direction while moving radially. This vibration is transmitted to contact cylinder 202, causing iron filings attached to the reverse spiral groove 203 to fall off under the action of vibration.
[0032] When the frustum pressing plate 4 moves continuously reciprocally along the axial direction, the first triangular protrusion 403 and the second triangular protrusion 404 alternately press and release. Under the combined action of the thrust of the first triangular protrusion 403 and the restoring force of the first elastic element 205, the guide block 201 continuously reciprocates radially along the telescopic hole 2. The reciprocating telescopic motion of the guide block 201 is transmitted to the contact cylinder 202, further causing the iron filings attached to the reverse spiral groove 203 to fall off under the action of vibration.
[0033] Meanwhile, the supporting components also have a positioning function during operation. Multiple second elastic elements 3, fixedly connected to the inner wall of the telescopic hole 2, push the pressure plate 301, causing the surface of the pressure plate 301 to fit against the surface of the guide block 201. The triangular groove plate 302, fixedly connected to the inner wall of the telescopic hole 2, and the triangular protrusion plate 303, fixedly connected to the surface of the guide block 201, cooperate with each other. The surface of the triangular protrusion plate 303 engages with the inner cavity of the triangular groove plate 302, restricting the circumferential rotation and axial displacement of the guide block 201 within the telescopic hole 2, thus achieving the positioning of the guide block 201 within the telescopic hole 2.
[0034] After the contact cylinder 202 extends, its outer circular surface contacts the inner wall of the deep hole of the turbocharger. When the boring bar 101 rotates, the contact cylinder 202 rotates freely around its own axis within the guide block 201, and its outer circular surface rolls along the inner wall of the deep hole.
[0035] During the rotation of the boring bar 101, the reverse spiral groove 203 formed on the surface of the contact cylinder 202 rotates together with the contact cylinder 202. The direction of rotation of the reverse spiral groove 203 is opposite to the working rotation direction of the boring bar 101. During the rotation, the reverse spiral groove 203 generates axial thrust, which transports coolant and iron filings to the opposite side of the feed direction of the boring machine body 1. The opening direction of the reflective guide groove 204 formed on the surface of the contact cylinder 202 faces the opposite side of the feed direction of the boring machine body 1. The reflective guide groove 204 discharges coolant, preventing coolant and iron filings from accumulating between the contact cylinder 202 and the inner wall of the deep hole.
[0036] Because there is a gap between the telescopic hole 2 and the guide block 201, the gap provides radial floating space for the guide block 201 when it slides radially within the telescopic hole 2. Multiple telescopic holes 2 are evenly distributed along the circumference of the boring bar 101, and the positions of the telescopic holes 2 are offset from the circumferential position of the boring tool 102. Multiple support components form uniform support points in the circumferential direction of the boring bar 101, keeping the boring bar 101 centered within the deep hole.
[0037] After the operator completes the adjustment of the extension length of the support component, he tightens the nut of the connector 501 to lock and fix the connector 501 and the boring bar 101, keeping the axial position of the frustum extrusion plate 4 unchanged.
Claims
1. A boring device for deep hole machining of a turbocharger, comprising a boring machine body (1), a boring bar (101) detachably connected to the surface of the boring machine body (1), and a boring tool (102) detachably connected to the boring bar (101). Its features are: The boring bar (101) is provided with a support auxiliary mechanism for supporting the boring bar (101), and the support auxiliary mechanism consists of a support component and an adjustment component; The support assembly includes a plurality of telescopic holes (2) formed on the surface of the boring bar (101), a guide block (201) slidably connected in the telescopic holes (2), a contact cylinder (202) rotatably connected in the guide block (201), a reverse spiral groove (203) formed on the surface of the contact cylinder (202), a reflective guide groove (204) formed on the surface of the contact cylinder (202), and a first elastic member (205) provided between the guide block (201) and the boring bar (101); The reverse spiral groove (203) rotates in the opposite direction to the working rotation direction of the boring bar (101), and the opening direction of the reflective guide groove (204) faces the opposite side of the feed direction of the boring machine body (1). The adjustment component is used to adjust the length of the support component extending out of the surface of the boring bar (101).
2. The boring device for deep hole machining of turbochargers according to claim 1, characterized in that: A gap is provided between the telescopic hole (2) and the guide block (201). The support assembly also includes a plurality of second elastic elements (3) fixedly connected to the inner wall of the telescopic hole (2), a pressure plate (301) fixedly connected to one end of the second elastic element (3), a triangular groove plate (302) fixedly connected to the inner wall of the telescopic hole (2), and a triangular protrusion plate (303) fixedly connected to the surface of the guide block (201).
3. A boring device for deep hole machining of turbochargers according to claim 2, characterized in that: The surface of the pressure plate (301) is in contact with the surface of the guide block (201) under the elastic force of the second elastic element (3), and the surface of the triangular protrusion plate (303) cooperates with the inner cavity of the triangular groove plate (302) to realize the positioning of the guide block (201) in the telescopic hole (2).
4. A boring device for deep hole machining of turbochargers according to claim 3, characterized in that: The adjustment assembly includes a frustum extrusion plate (4) slidably connected to the inner frustum extrusion plate (4) of the boring bar (101), a plurality of third elastic elements (401) fixedly connected to the frustum extrusion plate (4), a floating plate (402) fixedly connected to one end of the third elastic element (401), a plurality of first triangular protrusions (403) fixedly connected to the surface of the frustum extrusion plate (4), and a plurality of second triangular protrusions (404) fixedly connected to one end of the guide block (201), wherein one end of the second triangular protrusion (404) is in contact with the surface of the floating plate (402).
5. A boring device for deep hole machining of a turbocharger according to claim 4, characterized in that: The surface of the boring bar (101) is provided with a relief groove (5), and a connector (501) is slidably connected to the inner cavity of the relief groove (5). One end of the connector (501) is fixedly connected to the surface of the frustum extrusion plate (4), and the end of the connector (501) away from the frustum extrusion plate (4) extends to the outside of the boring bar (101). The connector (501) fits against the surface of the relief groove (5) to restrict the sliding direction of the connector (501).
6. A boring device for deep hole machining of a turbocharger according to claim 5, characterized in that: The inclined surface of the first triangular protrusion (403) is adapted to the inclined surface of the second triangular protrusion (404); when the frustum extrusion plate (4) slides along the axial direction of the boring bar (101), the first triangular protrusion (403) extrudes the second triangular protrusion (404) and drives the guide block (201) to slide radially along the telescopic hole (2); under the reset action of the first elastic element (205), the guide block (201) reciprocates radially along the telescopic hole (2) and causes the iron filings in the reverse spiral groove (203) to fall off.
7. A boring device for deep hole machining of a turbocharger according to claim 6, characterized in that: The contact cylinder (202) can rotate freely around its own axis. The outer circular surface of the contact cylinder (202) is adapted to the inner wall of the deep hole of the turbocharger. The multiple telescopic holes (2) are evenly distributed along the circumference of the boring bar (101), and the position of the telescopic holes (2) is offset from the circumferential position of the boring bar (102).
8. A method for deep hole machining of a turbocharger, characterized in that, A boring apparatus for deep hole machining of turbochargers according to any one of claims 1-9, the specific method comprising the following steps: S1. Place the turbocharger on the boring machine body (1), connect the boring bar (101) to the spindle of the boring machine body (1), operate the connecting piece (501) to drive the axial movement of the frustum extrusion plate (4), so that the guide block (201) slides radially along the telescopic hole (2), and drives the contact cylinder (202) to extend out of the surface of the boring bar (101); S2, the contact cylinder (202) contacts the inner wall of the deep hole of the turbocharger, and the inner wall of the deep hole squeezes the contact cylinder (202), so that the guide block (201) compresses the third elastic element (401) through the second triangular protrusion (404), thereby realizing the radial contraction of the contact cylinder (202); S3. The boring bar (101) rotates, which drives the contact cylinder (202) to rotate. The reverse spiral groove (203) transports the coolant and iron chips to the opposite side of the feed direction of the boring machine body (1). The reflective guide groove (204) reflects and discharges the coolant and iron chips. S4. After the contact cylinder (202) is separated from the inner wall of the deep hole and squeezed, the third elastic element (401) pushes the floating plate (402) to reset, which drives the guide block (201) to move radially. The triangular protrusion plate (303) separates from and engages with the triangular groove plate (302), causing the guide block (201) to vibrate and drive the iron filings in the reverse spiral groove (203) to fall off.