A machine tool for assembling knurled composite camshafts

Abstract

This invention discloses a machine tool for assembling a knurled composite camshaft, comprising: a vertical feed assembly, a rotary assembly, an assembly platform, a feed table assembly, and a lower center positioning device; the vertical feed assembly includes a movable platform and a first power source, the power source being fixedly mounted on the machine frame, the movable platform being connected to the power source and movable along a first direction; the rotary assembly is fixedly mounted on the vertical feed assembly and is used to grip and rotate the camshaft; the assembly platform has a through hole in the middle for the camshaft to pass through; the feed table assembly is movably mounted on the assembly platform and is used to assemble cam plates, signal wheels, rear end plugs, and oil pump cam plates, and the side of the feed table assembly near the rotary assembly has a knurling tool holder for knurling the camshaft; the lower center positioning device is fixed on the machine frame and is used to position the camshaft passing through the assembly platform. This configuration provides a versatile and efficient machine tool for assembling composite camshafts.

Description

Technical Field

[0001] This invention relates to the field of camshaft assembly technology, and in particular to a machine tool for assembling knurled composite camshafts. Background Technology

[0002] Currently, the camshafts used in mid-to-high-end vehicles are all knurled composite camshafts, basically covering most small engines. The advantages of knurling assembly are minimal deformation before and after assembly, high camshaft torque after assembly, and a shorter product processing route. As is well known, the assembly of knurled composite camshafts requires a knurling assembly process. However, the current knurling assembly process relies heavily on automated knurling equipment (such as robotic arms and automatic loading and unloading systems), which is only suitable for large-scale production of a single product. Due to the complexity of the assembly process, it cannot solve the problem of multi-variety, small-batch camshaft production in China. Developing new products is too difficult, the changeover cycle is too long, and the cost of changing automated equipment is also high.

[0003] The knurling process we use is a transverse knurling connection. This involves using a knurling tool to roll triangular grooves perpendicular to the axis onto the surface of the steel pipe. Then, a cam with a splined inner hole is pressed into the mandrel. Because the cam is harder than the mandrel, the inner wall tooth shape of the cam remains basically unchanged when it is pressed into the mandrel. This is equivalent to the inner wall of the cam being embedded in the mandrel, thus allowing it to withstand a larger torque and achieve a firm connection.

[0004] Therefore, how to provide a versatile and efficient assembly machine tool for combined camshafts is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an assembly machine tool for a knurled composite camshaft, which can provide a camshaft assembly machine tool with strong versatility and high efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A machine tool for assembling a knurled composite camshaft, used to sequentially assemble a cam plate, a signal wheel, a rear end plug, and an oil pump cam plate in a direction away from the front end plug of the camshaft, comprising:

[0008] The up-and-down feeding assembly includes a mobile platform and a first power source. The first power source is fixedly installed on the frame, and the mobile platform is connected to the first power source and can move along a first direction.

[0009] The rotating assembly includes a second power source and a clamp, the clamp being connected to the second power source via a rotating spindle, the rotating spindle being fixed to the moving platform, and its axial direction being parallel to the first direction;

[0010] The assembly platform is a plate-shaped structure and is fixedly installed on the frame. The assembly platform extends along the second direction and has a through hole in the middle for the camshaft to pass through.

[0011] A feed table assembly is movably mounted on the assembly platform, including a first feed table and a second feed table. The feed table assembly is used to assemble the cam plate, the signal wheel, the rear end plug and the oil pump cam plate. The feed table assembly is provided with a knurling tool holder for knurling the camshaft on the side near the rotating assembly.

[0012] A lower center positioning device is fixed to the assembly platform and is used to position the camshaft that passes through the assembly platform.

[0013] Preferably, the first power source end is provided with a first ball screw along the first direction, the moving platform is connected to the ball screw through a first screw nut, the frame is provided with a first linear guide along the first direction, and the moving platform moves along the first linear guide through a first slider.

[0014] Preferably, the clamp is a pneumatic chuck.

[0015] Preferably, the assembly platform is fixedly mounted with a second linear guide rail along the second direction on the side near the rotating component, and the feed table assembly moves along the second direction via a second slider.

[0016] Preferably, both the first feed table and the second feed table are provided with a third power source on the side away from the rotating assembly. The third power source transmits power through a second roller screw and a second screw nut mounted on the feed table assembly.

[0017] Preferably, the first feed table is movable along the second direction, and the first feed table is provided with a cam plate positioning chamber and a signal wheel positioning chamber, and the knurling tool holder is provided on the side of the first feed table near the rotating assembly.

[0018] Preferably, the second feed table can move along the second direction. The second feed table is provided with a rear end plug positioning chamber and an oil pump cam plate positioning chamber. Two knurling tool holders are provided on the side of the second feed table near the rotating assembly.

[0019] Preferably, the cam plate positioning chamber is movably provided with a cam plate feeding chamber for feeding.

[0020] Preferably, the lower center positioning device includes:

[0021] The fourth power source is fixedly mounted on the connecting plate, and its output shaft can move along the first direction;

[0022] The rear tip, corresponding to the through hole of the assembly platform, is connected to the output shaft of the fourth power source via a rack assembly.

[0023] Preferably, the first power source, the second power source, and the third power source are all servo motors.

[0024] Compared to the aforementioned background technology, the knurled composite camshaft assembly machine tool provided by the present invention is used to sequentially assemble a cam plate, a signal wheel, a rear end plug, and an oil pump cam plate in a direction away from the front end plug of the camshaft. It includes: an up-and-down feed assembly, a rotary assembly, an assembly platform, a feed table assembly, and a lower center positioning device; the up-and-down feed assembly includes a moving platform and a first power source, the first power source being fixedly mounted on the frame, and the moving platform being connected to the first power source and movable along a first direction; the rotary assembly includes a second power source and a fixture, the fixture being connected to the second power source via a rotary spindle, and the rotary spindle being fixedly mounted on the moving platform. The assembly platform is a plate-shaped structure fixedly mounted on the frame and extends along a second direction. A through hole for the camshaft to pass through is provided in the middle of the assembly platform. A feed table assembly is movably mounted on the assembly platform, including a first feed table and a second feed table. The feed table assembly is used to assemble cam plates, signal wheels, rear end plugs, and oil pump cam plates. A knurling tool holder for knurling the camshaft is provided on the side of the feed table assembly near the rotating assembly. A lower center positioning device is fixed to the frame and used to position the camshaft passing through the assembly platform.

[0025] Specifically, when it is necessary to assemble the cam plate, signal wheel, rear end plug, and oil pump cam plate onto the camshaft, the end of the front end plug on the camshaft is clamped by the fixture in the rotating assembly. At this time, the camshaft is in a vertical state and passes through the through hole on the assembly platform. Then, the lower center positioning device positions and fixes the camshaft. Under the action of the up and down feed assembly, the camshaft is moved to the position of the part to be installed. Then, the feed table assembly moves to the position of the camshaft to be processed. Under the action of the rotating assembly, the camshaft is rotated and knurled with the knurling tool holder. After the knurling is completed, the camshaft rises to its original position under the action of the up and down feed assembly. Then, the first feed table and the second feed table move to the position of the through hole. Then, the camshaft descends again and passes through the first feed table and the second feed table, thus completing the assembly of the cam plate, signal wheel, rear end plug, and oil pump cam plate in sequence.

[0026] With this setup, different cam plates, signal wheels, rear end plugs, and oil pump cam plates can be fixed on the first and second feed worktables to assemble different parts onto the camshaft. Furthermore, the fixture of the rotating component can also clamp camshafts of different specifications. Knurling can also be set at different positions on the camshaft by controlling the up and down feed components. This greatly improves the versatility of the assembly machine tool and increases its assembly efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the assembly machine tool for the knurled combined camshaft provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the camshaft structure provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the camshaft assembly provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the first feed table structure provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the second feed table provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the lower center positioning device provided in an embodiment of the present invention.

[0034] in:

[0035] 001-Camshaft, 002-Front end plug, 003-Cam plate, 004-Signal wheel, 005-Rear end plug, 006-Oil pump cam plate;

[0036] 100-rack;

[0037] 200 - Up and down feed components, 210 - Mobile platform, 220 - Primary power source;

[0038] 300 - Rotary assembly, 310 - Secondary power source, 320 - Fixture, 330 - Rotary spindle;

[0039] 400 - Assembly Platform;

[0040] 510-First feed table, 511-Cam plate positioning chamber, 512-Signal wheel positioning chamber, 513-Cam plate feed chamber, 520-Second feed table, 521-Rear end block positioning chamber, 522-Oil pump cam plate positioning chamber, 530-Knurled tool holder, 540-Third power source;

[0041] 600-Lower center positioning device, 610-Fourth power source, 611-Connecting plate, 620-Rear center, 630-Rack assembly. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0045] It should be noted that in this embodiment, the X direction in the attached figure is defined as the first direction, and the Y direction is defined as the second direction. The first direction and the second direction are perpendicular to each other.

[0046] Please see Figures 1 to 6This embodiment provides an assembly machine tool for a knurled composite camshaft 001, used to sequentially assemble a cam plate 003, a signal wheel 004, a rear end plug 005, and an oil pump cam plate 006 onto the camshaft 001 in a direction away from the front end plug 002. The machine tool includes: an up-and-down feed assembly 200, a rotary assembly 300, an assembly platform 400, a feed table assembly, and a lower center positioning device 600. The up-and-down feed assembly 200 includes a moving platform 210 and a first power source 220. The first power source 220 is fixedly mounted on the frame 100, and the moving platform 210 is connected to the first power source 220 and can move along a first direction. The rotary assembly 300 includes a second power source 310 and a fixture 320. The fixture 320 is connected to the second power source 310 via a rotary spindle 330. The assembly platform 400 is fixed to the moving platform 210, and its axis is parallel to the first direction; the assembly platform 400 is a plate-shaped structure, fixedly installed on the frame 100, and extends along the second direction. The assembly platform 400 has a through hole in the middle for the camshaft 001 to pass through; the feed table assembly is movably installed on the assembly platform 400, including a first feed table 510 and a second feed table 520. The feed table assembly is used to assemble the cam plate 003, signal wheel 004, rear end plug 005 and oil pump cam plate 006. The feed table assembly has a knurling tool holder 530 for knurling the camshaft 001 on the side near the rotating assembly 300; the lower center positioning device 600 is fixed to the assembly platform 400 and is used to position the camshaft 001 passing through the assembly platform 400.

[0047] Specifically, such as Figure 1 and Figure 2As shown, in this embodiment, the front end plug 002 of the camshaft 001 is first pressed in by a CNC servo press, and then the outer circle of the front end plug 002 is clamped by the clamp 320 in the rotating assembly 300 to perform rotational knurling on the camshaft 001. Then, the cam plate 003, signal wheel 004, rear end plug 005, and oil pump cam plate 006 are pressed in sequentially for assembly. The specific assembly process is as follows: First, the end of the front plug 002 on the camshaft 001 is clamped by the clamp 320 in the rotating assembly 300. At this time, the camshaft 001 is in a vertical position and passes through the through hole on the assembly platform 400. Then, the lower center positioning device 600 positions and fixes the camshaft 001. Under the action of the up and down feed assembly 200, the camshaft 001 is moved to the position of the part to be installed. Then, the feed table assembly moves to the position of the camshaft 001 to be processed. Under the action of the rotating assembly 300, the camshaft 001 is rotated, and with the help of the knurling tool holder 530, the camshaft 001 is knurled. After the knurling is completed, the camshaft 001 rises to its original position under the action of the up and down feed assembly 200, and the lower center positioning device 600 retracts. At this time, depending on the type of part to be installed, the first feed table 510 or the second feed table 510... The worktable 520 moves and moves the corresponding assembly fixed on the worktable to the through hole position. Then, the camshaft 001 descends again, and the lower center positioning device 600 also positions and fixes the camshaft 001. The camshaft 001 passes through the assembly fixed on the first feed worktable 510 or the second feed worktable 520 to complete the installation of the assembly. The first feed worktable 510 and the second feed worktable 520 are fixed with cam plate 003, signal wheel 004, rear end plug 005 and oil pump cam plate 006. When the corresponding assembly needs to be installed, the corresponding worktable moves to move the assembly to be installed to the through hole position. After the installation of one assembly is completed, the above knurling operation and pressing operation are repeated to complete the installation of cam plate 003, signal wheel 004, rear end plug 005, oil pump cam plate 006 and other assemblies in sequence.

[0048] Understandably, the rotating assembly 300 can not only clamp the camshaft 001 and rotate it for knurling, but also rotate the camshaft 001 to a suitable angle to precisely control the phase angle of each cam plate 003 and other parts to be assembled during assembly. The first feed table 510 and the second feed table 520 are movably set on the assembly platform 400, which can realize the axial positioning of parts such as cam plates 003, signal wheels 004, rear end plugs 005 and oil pump cam plates 006 for pressing in. In addition, the feed table assembly can simultaneously place multiple cam plates 003 to be assembled and install multiple cam plates 003 on the camshaft 001.

[0049] With this configuration, different cam plates 003, signal wheels 004, rear end plugs 005, and oil pump cam plates 006 can be fixed on the first feed worktable 510 and the second feed worktable 520 to assemble different parts onto the camshaft 001. Furthermore, the clamp 320 of the rotating assembly 300 can also clamp camshafts 001 of different specifications. Moreover, the knurling can be set at different positions on the camshaft 001 by controlling the up and down feed assembly 200. This greatly improves the versatility of the assembly machine tool and also increases its assembly efficiency.

[0050] Preferably, the first power source 220 is provided with a first ball screw at its end along the first direction, the moving platform 210 is connected to the ball screw through the first screw nut, the frame 100 is provided with a first linear guide along the first direction, and the moving platform 210 moves along the first linear guide through the first slider.

[0051] Specifically, such as Figure 1 As shown, the first power source 220 is fixed at the top of the frame 100, and its movable shaft is set in the vertical direction. The output shaft is connected to the first ball screw and can rotate with the rotation of the movable shaft of the first power source 220. The first screw nut is fixedly set at the rear of the moving platform 210 and is sleeved on the first ball screw. Therefore, when the output shaft of the first power source 220 rotates, it will drive the first ball screw to rotate. Under the action of the first screw nut, the moving platform 210 will move up and down in the first direction, that is, in the vertical direction. In addition, in order to make the movement of the moving platform 210 more stable and smooth, the first slider is set on both sides of the moving platform 210, and the first linear guide rail that cooperates with the first slider is installed on the frame 100 at the corresponding position. With this configuration, when the moving platform 210 needs to move up and down, it can be done simply by rotating the output shaft of the first power source 220.

[0052] Preferably, clamp 320 is a pneumatic chuck.

[0053] In this embodiment, the clamp 320 is preferably a pneumatic chuck, which can stably clamp the front end plug 002 of the camshaft 001, thereby processing and assembling the camshaft 001.

[0054] Preferably, the assembly platform 400 is fixedly mounted with a second linear guide along the second direction on the side near the rotating component 300, and the feed table assembly moves along the second direction via the second slider.

[0055] Specifically, such as Figure 1As shown, two parallel second linear guides are provided on one side of the assembly platform 400. The feed table assembly, namely the first feed table 510 and the second feed table 520, is equipped with a second slider at the bottom for cooperating with the second linear guides. In this way, both the first feed table 510 and the second feed table 520 can move along the second direction on the assembly platform 400. This arrangement allows the first feed table 510 and the second feed table 520 to have a definite movement path and direction, which facilitates the assembly of the camshaft 001.

[0056] Preferably, a third power source 540 is provided on the side of the first feed table 510 and the second feed table 520 away from the rotating assembly 300. The third power source 540 transmits power through a second roller screw and a second screw nut installed on the feed table assembly.

[0057] Specifically, such as Figure 4 and Figure 5 As shown, the first feed table 510 and the second feed table 520 are arranged opposite each other on the assembly platform 400, located on both sides of the rotating assembly 300. A third power source 540 is provided on the outer side of both the first feed table 510 and the second feed table 520. The movement of the first feed table 510 and the second feed table 520 is achieved by the cooperation of the second roller screw and the second screw nut installed on the feed table assembly. It should be noted that the two third power sources 540 installed on the first feed table 510 and the second feed table 520 can be controlled separately to realize the free movement of the first feed table 510 and the second feed table 520.

[0058] Preferably, the first feed table 510 can move along the second direction. The first feed table 510 is provided with a cam plate positioning chamber 511 and a signal wheel positioning chamber 512. A knurling tool holder 530 is provided on the side of the first feed table 510 near the rotating assembly 300.

[0059] Specifically, such as Figure 4 As shown, the first feed table 510 is Figure 1On the left-hand feed table, the first feed table 510 is equipped with a cam plate positioning chamber 511 and a signal wheel positioning chamber 512. The cam plate positioning chamber 511 can position and fix the cam plate 003 to be installed. After fixing, it will move to the middle through hole position of the assembly platform 400 under the drive of the third power source 540. In this embodiment, the through hole position corresponds to the axis position of the upper rotating component 300, that is, the axis position of the clamped camshaft 001. When the cam plate positioning chamber 511 moves into place, the camshaft 001 will rotate a certain angle under the action of the rotating component 300, so that it rotates to the proper assembly phase angle. Then, under the action of the up and down feed assembly 200, the camshaft 001 moves downward, and the lower center positioning device 600 positions and fixes the camshaft 001, assembling it into the cam plate 003; the signal wheel positioning chamber 512 is the same, except that the signal wheel positioning chamber 512 is used to fix and install the signal wheel; in addition, a knurling tool holder 530 for knurling the camshaft 001 is set on the inner side of the first feed worktable 510. Before assembling other parts into the camshaft 001, the camshaft 001 is first positioned by the lower center positioning device 600, and knurling is machined at the position of the parts to be installed by the rotation of the rotating assembly 300.

[0060] It should be noted that in this embodiment, the first feed table 510 is also provided with a spare positioning chamber, which can fix other different types of parts or replace the damaged positioning chamber.

[0061] Preferably, the second feed table 520 can move along the second direction. The second feed table 520 is provided with a rear end block positioning chamber 521 and an oil pump cam plate positioning chamber 522. Two knurling tool holders 530 are provided on the side of the second feed table 520 near the rotating assembly 300.

[0062] Specifically, such as Figure 5 As shown, the overall structure of the second feed table 520 is similar to that of the first feed table 510. The only difference is that the positioning chambers on the second feed table 520 are specifically the rear end plug positioning chamber 521 and the oil pump cam plate positioning chamber 522. In addition, two knurling tool holders 530 are set on the left side of the second feed table 520. The two knurling tool holders 530 on the second feed table 520 can cooperate with the knurling tool holders 530 on the first feed table 510 to knurl the camshaft 001. This makes the knurling process of the camshaft 001 more mature and efficient.

[0063] Of course, the specific type and location of the positioning chambers on the first feed table 510 and the second feed table 520 can be adjusted according to the actual situation, as long as the cam can complete the assembly.

[0064] Preferably, a cam plate feeding chamber 513 for feeding is movably provided at the cam plate positioning chamber 511.

[0065] Understandably, multiple cam plates 003 may be assembled on the camshaft 001. Therefore, in order to improve the assembly efficiency of the camshaft 001, a cam plate feed chamber 513 is installed at the cam plate positioning chamber 511. The cam plate feed chamber 513 can store multiple cam plates 003. When it is necessary to install the cam plate 003, the cam plate 003 can be positioned and pushed onto the cam plate positioning chamber 511 by a cylinder. After the cam plate 003 is fixed, it is moved back to a distance. By repeatedly pushing the cam plate 003 on the feed chamber 513, the assembly of multiple cam plates 003 can be completed. This can greatly improve the installation efficiency of the cam plate 003.

[0066] Preferably, the lower center positioning device 600 includes: a fourth power source 610 and a rear center 620; the fourth power source 610 is fixedly mounted on the connecting plate 611, and its output shaft can move along a first direction; the rear center 620 is set with a through hole corresponding to the assembly platform 400, and is connected to the output shaft of the fourth power source 610 through a rack assembly 630.

[0067] Specifically, such as Figure 6 As shown, a connecting plate 611 is connected directly below the assembly platform 400. The connecting plate 611 is a strip-shaped structure with its length extending vertically upward. A fourth power source 610 is fixedly installed at the lower end of the connecting plate 611. The fourth power source 610 is a telescopic cylinder. The movable end of the cylinder is connected to a rack assembly 630, and the rack assembly 630 is also connected to a rear center 620. The rear center 620 is located exactly on the axis of the through hole of the assembly platform 400. In this way, the rear center 620 can move upward under the action of the fourth power source 610 to position and fix the camshaft 001.

[0068] Preferably, the first power source 220, the second power source 310, and the third power source 540 are all servo motors.

[0069] Specifically, in this embodiment, in order to accurately control the rotation angle of the camshaft 001 and the diameter of the knurling, the first power source 220, the second power source 310 and the third power source 540 are all servo motors. Among them, the first power source 220 is a 180ST-M75010MAZ series servo motor, the second power source 310 is a 150ST-M23015M6A series servo motor, and the third power source 540 is a KA130-M10015M6A series AC synchronous servo motor.

[0070] Of course, the specific model of the servo motor can be set according to the actual situation. This article does not make specific restrictions, as long as the expected effect can be achieved.

[0071] In this embodiment, a pressure and displacement monitor is also installed at the fixture 320 to monitor the pressure curve of the knurled camshaft 001 during press-fitting, and to realize pressure monitoring alarm and position detection. It integrates the accurate acquisition and monitoring of press-fitting force and press-fitting displacement data during the press-fitting process, and uses rich judgment window functions to achieve the precise press-fitting target. This embodiment also designs a positioning device for the fixture 320, and configures a cylinder position sensor and position detection. In addition, an automatic lubrication system and an oiler are also configured to provide lubrication for the lead screws and racks of each shaft.

[0072] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0074] The embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A knurling combined camshaft assembling machine tool for sequentially assembling cam lobes (003), signal wheels (004), rear end plugs (005) and oil pump cam lobes (006) to a camshaft (001) in a direction away from a front end plug (002), characterized in that, The utility model relates to a camshaft assembly line, including: The upper and lower feeding assembly (200) includes a moving platform (210) and a first power source (220), the first power source (220) is fixedly installed on the rack (100), the moving platform (210) is connected with the first power source (220), and can move along a first direction; The rotating assembly (300) includes a second power source (310) and a clamp (320), the clamp (320) is connected with the second power source (310) through a rotating main shaft (330), the rotating main shaft (330) is fixedly arranged on the moving platform (210), and the axis direction is parallel to the first direction; The assembly platform (400) is a plate structure, is fixedly installed on the rack (100), and extends along a second direction, and the middle part of the assembly platform (400) is provided with a through hole for the camshaft (001) to pass through; The feeding workbench assembly is movably installed on the assembly platform (400) and includes a first feeding workbench (510) and a second feeding workbench (520), the feeding workbench assembly is used for assembling the cam lobe (003), the signal wheel (004), the rear end plug (005) and the oil pump cam lobe (006), and the feeding workbench assembly is provided with a knurling tool rest (530) for knurling the camshaft (001) on the side close to the rotating assembly (300); The lower center positioning device is fixedly arranged on the assembly platform (400) and is used for positioning the camshaft (001) passing through the assembly platform (400).

2. The knurling assembly machine for camshafts according to claim 1, characterized in that, The end of the first power source (220) is provided with a first ball screw along the first direction, the moving platform (210) is connected with the ball screw through a first screw nut, the rack (100) is provided with a first linear guide rail along the first direction, and the moving platform (210) moves along the first linear guide rail through a first sliding block.

3. The knurling assembly machine for camshaft as claimed in claim 1 wherein, The clamp (320) is a pneumatic chuck.

4. The knurling assembly machine for camshafts as claimed in claim 1, wherein, The assembly platform (400) is fixedly installed with a second linear guide rail along the second direction on the side close to the rotating assembly (300), and the feeding workbench assembly moves along the second direction through a second sliding block.

5. The knurling assembly machine for camshafts according to claim 4, characterized in that, The first feeding workbench (510) and the second feeding workbench (520) are provided with a third power source (540) on the side away from the rotating assembly (300), and the third power source transmits power through cooperation of a second roller screw and a second screw nut installed on the feeding workbench assembly.

6. The knurling assembly machine for camshafts according to claim 5, characterized in that, The first feeding workbench (510) can move along the second direction, is provided with a cam lobe positioning bin (511) and a signal wheel positioning bin (512) on the first feeding workbench (510), and is provided with a knurling tool rest (530) on the side close to the rotating assembly (300).

7. The knurling assembly machine for camshafts according to claim 6, characterized in that, A second feeding workbench (520) is movable along the second direction, and a rear end block positioning bin (521) and an oil pump cam lobe positioning bin (522) are arranged on the second feeding workbench (520). Two knurling tool holders (530) are arranged on the side of the second feeding workbench (520) close to the rotating assembly (300).

8. The knurling assembly machine for camshafts according to claim 7, characterized in that, A cam lobe feeding bin (513) for feeding is movably arranged at the cam lobe positioning bin (511).

9. The knurling assembly machine for camshafts as claimed in claim 1, wherein, The lower center positioning device (600) comprises: A fourth power source (610) is fixedly installed on a connecting plate (611), and an output shaft of the fourth power source (610) is movable along the first direction. A rear center (620) is arranged corresponding to the through hole of the assembly platform (400) and is connected with the output shaft of the fourth power source (610) through a rack assembly (630).

10. The knurling assembly machine for camshafts as claimed in claim 5 wherein, The first power source (220), the second power source (310) and the third power source (540) are all servo motors.

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