An apparatus for machining a shaft hole in a camshaft holder during a sample preparation stage

Abstract

The application discloses a device for machining a shaft hole in a camshaft frame in a sample preparation stage, which comprises a general CNC machine tool, a tool mechanism and a clamp mechanism. The tool mechanism comprises a short-distance angle head, a rotating seat arranged on the short-distance angle head, an inverted L-shaped mounting seat arranged on the rotating seat, and a tool clamping seat arranged on the inner side surface of the L-shaped mounting seat. The tool clamping seat is provided with a boss, a inverted T-shaped tool holder is protrusively arranged at the front end of the boss, and a tool assembly is arranged on the inverted T-shaped tool holder. A plurality of assembly notches are circumferentially arranged on the boss of the tool clamping seat, and a guide strip is protrusively arranged in each assembly notch and is obliquely distributed. The clamp mechanism clamps a camshaft frame to be machined. The tool assembly comprises rough machining tool grains and fine machining tool grains which are alternately arranged on the inverted T-shaped tool holder. The device drives the tool assembly through the short-distance angle head, so that the tool is prevented from vibrating due to being too long and affecting the hole machining quality. The rough machining tool and the fine machining tool are arranged on the tool clamping seat, so that the tool does not need to be replaced during machining, and the machining efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of camshaft carrier machining technology, and more particularly to a device for machining the central shaft hole of a camshaft carrier during the sample preparation stage. Background Technology

[0002] Typically, automakers outsource some automotive component projects (such as camshaft bracket bore drilling) to other automotive component suppliers. During the production process, these suppliers first produce small batches of prototypes (sample making). Only after verifying that the prototypes meet all the requirements can they proceed to mass production (mass production). However, during the process from sample making to mass production, the product structure may be modified, and some projects may even fail and prevent mass production.

[0003] Please refer to the instruction manual appendix. Figure 1 Camshaft carriers are relatively large and long frame-shaped products. The technical difficulty in producing camshaft carriers lies in ensuring the coaxiality between the several camshaft holes 100 spaced apart in each gear.

[0004] During mass production, to ensure the coaxiality between the various camshaft holes 100, specialized mass production drilling equipment, specialized mass production long cutting tools, and specialized mass production tooling fixtures are typically required. These three components work together to machine the camshaft holes 100 with high coaxial precision. Furthermore, the machining process for the camshaft carrier generally involves two steps: rough machining to drill small holes, followed by finish machining to enlarge the holes. Rough machining produces small-diameter holes, while finish machining produces large-diameter holes. Therefore, the mass production stage of the camshaft carrier requires two sets of specialized mass production long cutting tools for drilling the holes separately.

[0005] During the small-batch prototyping stage, due to the short processing cycle and high cost risk of camshaft brackets, manufacturers usually do not directly invest in dedicated mass production equipment (dedicated mass production drilling equipment, dedicated mass production long cutting tools, and dedicated mass production tooling fixtures) for prototyping production. Therefore, outsourced suppliers usually adopt a compromise approach, that is, only investing in dedicated mass production long cutting tools in combination with existing general-purpose CNC machine tools (non-dedicated mass production drilling equipment), and using the combination of the two to process camshaft holes in small batches.

[0006] In summary, the machining of camshaft supports has had the following defects in both the mass production and prototyping stages:

[0007] 1. Due to the excessive length and insufficient rigidity of the dedicated mass-production long cutting tool, if it is used with a general-purpose CNC machine tool to process the camshaft hole, the tool will vibrate uncontrollably, resulting in poor forming quality of the camshaft hole and low coaxiality during the sample preparation stage, which does not meet the precision requirements of the product.

[0008] 2. Specialized mass production equipment is specialized and can only be used to process camshaft holes, not other products, resulting in low equipment utilization.

[0009] 3. Dedicated mass production equipment is specialized, and the dedicated mass production tooling fixtures it comes with only have dedicated tool guide sleeves, resulting in poor versatility. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a device for machining the central shaft hole of a camshaft bracket during the sample preparation stage, thereby overcoming the deficiencies in existing technologies.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] An apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage includes a general-purpose CNC machine tool, and a tool mechanism and a fixture mechanism arranged vertically and vertically on the general-purpose CNC machine tool.

[0013] The tool mechanism includes a short-distance angle head, a rotating seat is provided on the short-distance angle head, an inverted L-shaped mounting seat is provided on the rotating seat, and a tool clamping seat is provided on the inner side of the L-shaped mounting seat.

[0014] The tool holder is provided with a boss, and a swastika-shaped tool holder is provided at the front end of the boss. The tool assembly is installed on the swastika-shaped tool holder.

[0015] The tool holder has mounting slots evenly distributed around the boss in the circumferential direction. Each mounting slot has a protruding guide bar, which is obliquely distributed on the boss of the tool holder.

[0016] The clamping mechanism holds and fixes the camshaft frame to be processed.

[0017] Furthermore, the tool assembly includes roughing inserts and finishing inserts alternately arranged on a swastika-shaped tool holder; the length of the roughing insert extending axially from the swastika-shaped tool holder is slightly greater than the length of the finishing insert extending axially from the swastika-shaped tool holder, and the rotation radius of the roughing insert is slightly smaller than the rotation radius of the finishing insert.

[0018] Furthermore, the rotation radius of the finishing cutting tool is slightly larger than the rotation radius of the guide bar.

[0019] Furthermore, in the tool mechanism, a number of internal cooling ports are provided on the tool holder, and the internal cooling ports are connected to an external container holding cooling cutting fluid through built-in pipes.

[0020] Furthermore, the clamping mechanism includes a positioning frame, a clamping plate is provided on the top of the positioning frame, and a lifting guide assembly, a pre-positioning assembly, a positioning assembly and a clamping assembly are provided on the clamping plate.

[0021] Furthermore, the lifting guide assembly includes a guide sleeve and a guide post symmetrically and slidably disposed at the bottom of the clamping plate, and a lifting cylinder fixedly disposed at the center position at the bottom of the clamping plate.

[0022] Furthermore, the guide sleeve is fixed to the bottom surface of the fixture plate, the top end of the guide post passes through the guide sleeve and the fixture plate and is connected to the prepositioning component set on the top surface of the fixture plate, and the output end of the lifting cylinder passes through the fixture plate and drives the prepositioning component to rise and fall.

[0023] Furthermore, the pre-positioning component includes a support frame, a positioning sensor, and a coarse limiting plate; the support frame is located in the middle of the clamping plate, the bottom of the support frame is connected to the guide column and the output end of the lifting cylinder, and plastic pads are provided on both sides of the top surface of the support frame; the positioning sensor and the coarse limiting plate are spaced apart at the rear end edge of the top surface of the support frame, and the coarse limiting plate is symmetrically arranged on both sides of the positioning sensor.

[0024] Furthermore, the positioning assembly includes several support seats and positioning pin seats; the distribution position of the support seats on the fixture plate is adapted to the bottom surface of the camshaft carrier; the distribution position of the positioning pin seats on the fixture plate is adapted to the assembly hole position of the camshaft carrier.

[0025] Furthermore, the clamping assembly includes several clamping cylinders disposed on the clamping plate, and each clamping cylinder has an L-shaped pressure block installed on its output shaft.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1) The device described in this case for machining the central shaft hole of a camshaft bracket during the sample preparation stage uses a general-purpose CNC machine tool to drive a short-distance angle head, thereby driving the tool assembly and avoiding vibration caused by excessively long tools, which would affect the hole quality. Simultaneously, both roughing and finishing tools are mounted on the tool holder, allowing for the completion of both roughing and finishing processes of the camshaft hole with just one tool assembly. This eliminates the need for machine downtime for tool changes, resulting in high tool utilization and high machining efficiency.

[0028] 2) In this case, an apparatus for machining the central shaft hole of a camshaft holder during the sample preparation stage has guide bars uniformly protruding circumferentially from the boss of the tool holder. The guide bars are obliquely distributed, and since the rotation radius of the finishing tool is slightly larger than the rotation radius of the guide bars, a guide gap is formed between the boss of the tool holder and the inner wall of the camshaft hole. The guide gap is divided by the obliquely distributed guide bars, and the cooling cutting fluid filling the guide gap forms a supporting film, thereby playing a guiding and restricting role, ensuring that the tool assembly can move stably along the axial direction of the camshaft hole.

[0029] 3) The device in this case for processing the central shaft hole of the camshaft bracket during the sample preparation stage reduces the investment in special equipment during the sample preparation stage, lowers production costs, and ensures the processing quality of products during the sample preparation stage.

[0030] To provide a clearer understanding of the present invention, the preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0031] Figure 1 This is a reference diagram showing the usage state of the present invention;

[0032] Figure 2 This is a schematic diagram of the short-distance angle head of the present invention;

[0033] Figure 3 , Figure 4 This is a schematic diagram of the tool holder of the present invention;

[0034] Figure 5 , Figure 6 This is a schematic diagram of the clamping mechanism of the present invention;

[0035] Figure 7 This is a schematic diagram of the positioning component and clamping component of the present invention.

[0036] Attached image labels:

[0037] 1-Short-distance angle head, 2-Tool holder, 3-Tool assembly; 11-Rotating seat, 12-L-type mounting seat; 21-Boss, 22-Swastika-shaped tool holder, 23-Guide bar; 31-Roughing insert, 32-Finishing insert; 41-Positioning frame, 42-Clamping plate; 51-Guide sleeve, 52-Guide column, 53-Lifting cylinder; 61-Support frame, 62-Position sensor, 63-Rough limit plate, 64-Plastic pad; 71-Support seat, 72-Positioning pin seat; 81-Clamping cylinder, 82-L-type pressure block; 100-Camshaft hole. Detailed Implementation

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0040] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0041] Please see Figure 1-7 The present invention provides an apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage, comprising a general-purpose CNC machine tool (not shown), and a tool mechanism and a fixture mechanism arranged vertically and vertically on the general-purpose CNC machine tool.

[0042] The cutting tool mechanism includes a short-distance angle head 1, a cutting tool holder 2 is provided on the short-distance angle head 1, and a cutting tool assembly 3 is held on the cutting tool holder 2; the overall width of the cutting tool assembly 3 is smaller than the distance between two adjacent camshaft holes.

[0043] The short-distance angle head 1 has a vertically arranged rotating base 11, on which an inverted L-shaped mounting base 12 is arranged, and the tool holder 2 is arranged on the L-shaped mounting base 12. The short-distance angle head 1 is connected to a general-purpose CNC machine tool through the rotating base 11. The general-purpose CNC machine tool drives the rotating base 11 to rise or drive the L-shaped mounting base 12 to rotate, thereby adjusting the machining direction of the tool assembly 3 on the tool holder 2.

[0044] The tool holder 2 is horizontally mounted on the inner side of the L-shaped mounting base 12. The tool holder 2 is provided with a boss 21, and a swastika-shaped tool holder 22 is provided at the front end of the boss 21. The tool assembly 3 is mounted on the swastika-shaped tool holder 22.

[0045] Furthermore, the boss 21 of the tool holder 2 is uniformly provided with mounting slots in the circumferential direction, and a guide bar 23 is provided protruding in each mounting slot. The guide bar 23 is obliquely distributed on the circumferential surface of the boss 21 of the tool holder 2. The gap formed by the isolation between each guide bar 23 and the cutting fluid sprayed into the gap form a supporting film, thereby playing a guiding and restricting role, ensuring that the tool assembly 3 can move stably along the axial direction of the camshaft hole, which can improve the rigidity of the tool assembly 3 and suppress the vibration of the tool assembly 3 during machining.

[0046] The tool assembly 3 includes roughing inserts 31 and finishing inserts 32 alternately arranged on a swastika-shaped tool holder 22. The length of the roughing insert 31 extending axially out of the swastika-shaped tool holder 22 is slightly greater than the length of the finishing insert 32 extending axially out of the swastika-shaped tool holder 22, so that when machining the camshaft hole, the roughing insert 31 contacts the cutting surface of the camshaft holder first before the finishing insert 32. At the same time, the rotation radius of the roughing insert 31 is slightly smaller than the rotation radius of the finishing insert 32, so that the roughing insert 31 first initially cuts out a camshaft hole with a small radius, and then the finishing insert 32 finishes out a camshaft hole with a large radius.

[0047] In this application, the roughing insert 31 and the finishing insert 32 are alternately set on the swastika-shaped tool holder 22. Only one tool assembly 3 is needed to complete the two processes of roughing and finishing of the camshaft hole. There is no need to stop the machine to change the tool, which has high processing efficiency. Due to the simple structure, the subsequent maintenance is also less and the maintenance cost is low.

[0048] Furthermore, in the tool mechanism, a number of internal cooling ports (not shown in the figure) are also provided on the tool holder 2. The internal cooling ports are connected to an external container for holding cooling cutting fluid through built-in pipes, which is used to spray cooling cutting fluid during the machining of camshaft holes. This can protect the machining cutting bits and improve the machining speed and machining quality.

[0049] Furthermore, the rotation radius of the finishing insert 32 is slightly larger than that of the guide bar 23, so that the diameter of the camshaft hole cut by the finishing insert 32 is also slightly larger than that of the guide bar 23. This results in a guide gap being formed between the boss 21 of the tool holder 2 and the inner wall of the camshaft hole. This guide gap is divided by the guide bar 23 in a diagonal pattern. The cooling cutting fluid filling the guide gap forms the support film, thereby playing a guiding and restricting role, ensuring that the tool assembly 3 can move stably along the axial direction of the camshaft hole.

[0050] Working principle of the tool mechanism for machining camshaft holes:

[0051] 1. The clamping mechanism first clamps the camshaft bracket, and then the general-purpose CNC machine tool drives the short-distance angle head 1 to descend to the distance between adjacent cutting surfaces. The machining direction and angle of the tool holder 2 are adjusted by the rotary seat 11. The general-purpose CNC machine tool drives the tool assembly 3 on the tool holder 2 to gradually contact the cutting surface.

[0052] 2. The high-speed rotating roughing insert 31 contacts the cutting surface of the camshaft carrier before the finishing insert 32. The roughing insert 31 first preliminarily cuts out a small radius camshaft hole, and then the finishing insert 32 finishes out a large radius camshaft hole. At the same time, during the cutting and hole making process, under the control of the general-purpose CNC machine tool, the internal cooling port sprays cooling cutting fluid into the camshaft hole.

[0053] 3. Cooling cutting fluid fills the guide gap between the boss 21 and the inner wall of the camshaft hole, forming a high-speed rotating support film. Under the guidance and restriction of the support film, the tool assembly 3 moves steadily along the axial direction of the camshaft hole until one camshaft hole is machined.

[0054] 4. Under the control of a general-purpose CNC machine tool, the tool assembly 3 can be raised or lowered or moved laterally for positioning. Repeat the above steps until each camshaft hole is machined.

[0055] The clamping mechanism includes a positioning frame 41, a clamping plate 42 on the top of the positioning frame 41, and a lifting guide assembly, a pre-positioning assembly, a positioning assembly and a clamping assembly on the clamping plate 42.

[0056] The lifting guide assembly includes a guide sleeve 51 and a guide post 52 symmetrically and slidably disposed at the bottom of the clamping plate 42, and a lifting cylinder 53 fixedly disposed at the center of the bottom of the clamping plate 42. The guide sleeve 51 is fixed to the bottom surface of the clamping plate 42, the top end of the guide post 52 passes through the guide sleeve 51 and the clamping plate 42 and connects to a pre-positioning component disposed on the top surface of the clamping plate 42, and the output end of the lifting cylinder 53 passes through the clamping plate 42 and drives the pre-positioning component to rise and fall. The function of this lifting guide assembly is to lower the camshaft bracket, which is placed high on the pre-positioning component, and accurately place it on the positioning component.

[0057] The pre-positioning component includes a support frame 61, a positioning sensor 62, and a coarse limiting plate 63;

[0058] The support frame 61 is located in the middle of the clamp plate 42. The bottom of the support frame 61 is connected to the guide column 52 and the output end of the lifting cylinder 53. Plastic pads 64 are provided on both sides of the top surface of the support frame 61 to prevent the support frame 61 from scratching the camshaft frame placed on it. The support frame 61 is made of metal, has high rigidity, and can support large and heavy camshaft frames.

[0059] The positioning sensor 62 and the coarse limiting plate 63 are spaced apart at the rear end edge of the top surface of the support frame 61, and the coarse limiting plate 63 is symmetrically arranged on both sides of the positioning sensor; the coarse limiting plate 63 and the positioning sensor 62 are used to limit the camshaft frame placed on the support frame 61 and detect whether it is placed in place.

[0060] The function of the pre-positioning component is to drive the liftable support frame 61 through the lifting cylinder 53, first place the camshaft frame at a high position on the support frame 61 and then slowly lower it into place, so as to avoid deviation and damage to other parts such as instruments and equipment on the fixture plate 42 when the large and heavy camshaft frame is placed directly.

[0061] The positioning assembly includes several support seats 71 and positioning pin seats 72. The distribution of the support seats 71 on the fixture plate 42 is adapted to the bottom surface of the camshaft frame, so that the support seats 71 can support the camshaft frame that has been lowered into position from the bottom. The distribution of the positioning pin seats 72 on the fixture plate 42 is adapted to the assembly hole positions of the camshaft frame, so that the positioning pins on the positioning pin seats 72 can be inserted into the assembly holes of the lowered camshaft frame. Preferably, in this embodiment, only two positioning pin seats 72 are used to avoid over-positioning and affecting production efficiency. The support seats 71 and positioning pin seats 72 work together to fix the camshaft frame on the support frame 61.

[0062] The clamping assembly includes several clamping cylinders 81 mounted on the clamping plate 42. Each clamping cylinder 81 has an L-shaped pressure block 82 mounted on its output shaft. The clamping cylinder 81 drives the L-shaped pressure block 82 to press against the flange of the camshaft bracket from the inside, thereby further fixing the camshaft bracket on the support frame 61.

[0063] The overall workflow of the device used in this case for machining the central shaft hole of the camshaft bracket during the sample preparation stage is as follows:

[0064] 1. The camshaft bracket is placed on the support frame 61. The position sensor 62 detects whether it is in position. Then, the lifting cylinder 53 drives the camshaft bracket on the support frame 61 to move downward to the positioning component. The position sensor 62 detects whether it is in position again. The clamping cylinder drives the L-shaped pressure plate to clamp the camshaft bracket.

[0065] 2. A general-purpose CNC machine tool drives a short-distance angle head 1, which in turn drives the tool assembly 3 to process the camshaft holes one by one; the processing of each camshaft hole includes two processes: preliminary machining and finishing machining.

[0066] 3. After all camshaft holes have been machined, the clamping cylinder drives the L-shaped pressure plate to loosen, and the lifting cylinder 53 drives the camshaft bracket on the support frame 61 to move upward to its original position.

[0067] Compared to existing technologies, the device in this case for machining the central shaft hole of a camshaft bracket during the sample preparation stage uses a general-purpose CNC machine tool to drive a short-distance angle head, thereby driving the tool assembly. This avoids vibration caused by excessively long tools, which could affect the hole quality. Furthermore, both roughing and finishing tools are mounted on the tool holder, allowing a single tool assembly to complete both roughing and finishing processes of the camshaft hole without requiring machine downtime for tool changes. This results in high tool utilization and high machining efficiency.

[0068] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage, comprising a general-purpose CNC machine tool, and a tool mechanism and a fixture mechanism arranged vertically and horizontally on the general-purpose CNC machine tool, characterized in that: The tool mechanism includes a short-distance angle head (1), a rotating seat (11) is provided on the short-distance angle head (1), an inverted L-shaped mounting seat (12) is provided on the rotating seat (11), and a tool clamping seat (2) is provided on the inner side of the L-shaped mounting seat (12). The tool holder (2) is provided with a boss (21), and a swastika-shaped tool holder (22) is provided at the front end of the boss (21). The tool assembly (3) is installed on the swastika-shaped tool holder (22). The boss (21) of the tool holder (2) is evenly provided with mounting slots in the circumferential direction. Each mounting slot is provided with a guide bar (23) protruding out. The guide bar (23) is obliquely distributed on the boss (21) of the tool holder (2). The clamping mechanism is used to clamp and fix the camshaft frame to be processed; the clamping mechanism includes a positioning frame (41), and a clamping plate (42) is provided on the top of the positioning frame (41). The clamping plate (42) is provided with a lifting guide assembly, a pre-positioning assembly, a positioning assembly and a clamping assembly. The lifting guide assembly includes a guide sleeve (51) and a guide post (52) symmetrically and slidably disposed at the bottom of the clamping plate (42), and a lifting cylinder (53) fixedly disposed at the center of the bottom of the clamping plate (42); the guide sleeve (51) is fixed on the bottom surface of the clamping plate (42), the top end of the guide post (52) passes through the guide sleeve (51) and the clamping plate (42) and is connected to a pre-positioning assembly disposed on the top surface of the clamping plate (42), and the output end of the lifting cylinder (53) passes through the clamping plate (42) and drives the pre-positioning assembly to lift; The pre-positioning component includes a support frame (61), a position sensor (62), and a coarse limiting plate (63). The support frame (61) is located in the middle of the clamping plate (42). The bottom of the support frame (61) is connected to the guide column (52) and the output end of the lifting cylinder (53). Plastic pads (64) are provided on both sides of the top surface of the support frame (61). The position sensor (62) and the coarse limiting plate (63) are spaced apart at the rear end edge of the top surface of the support frame (61). The coarse limiting plate (63) is symmetrically arranged on both sides of the position sensor.

2. The apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage according to claim 1, characterized in that: The tool assembly (3) includes roughing inserts (31) and finishing inserts (32) alternately arranged on a swastika-shaped tool holder (22); the length of the roughing insert (31) extending axially out of the swastika-shaped tool holder (22) is slightly greater than the length of the finishing insert (32) extending axially out of the swastika-shaped tool holder (22), and the rotation radius of the roughing insert (31) is slightly smaller than the rotation radius of the finishing insert (32).

3. The apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage according to claim 2, characterized in that: The radius of rotation of the finishing blade (32) is slightly larger than the radius of rotation of the guide bar (23).

4. The apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage according to claim 1, characterized in that: In the tool mechanism, a number of internal cooling ports are provided on the tool holder (2), and the internal cooling ports are connected to an external container for holding cooling cutting fluid through built-in pipes.

5. The apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage according to claim 1, characterized in that: The positioning assembly includes several support seats (71) and positioning pin seats (72); the distribution position of the support seats (71) on the fixture plate (42) is adapted to the bottom surface of the camshaft bracket; the distribution position of the positioning pin seats (72) on the fixture plate (42) is adapted to the assembly hole position of the camshaft bracket.

6. The apparatus for machining the central shaft hole of a camshaft bracket during the sample preparation stage according to claim 1, characterized in that: The clamping assembly includes several clamping cylinders (81) mounted on the clamping plate (42), and each clamping cylinder (81) has an L-shaped pressure block (82) mounted on its output shaft.

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