Automobile engine cam composite heat treatment device and treatment method

Abstract

The invention relates to the technical field of heat treatment, and discloses an automobile engine cam composite heat treatment device which comprises a gas nitriding furnace, and a heat processing mechanism comprises a controllable atmosphere multi-purpose furnace fixedly arranged on one side of the gas nitriding furnace and a tempering furnace fixedly arranged on one side of the controllable atmosphere multi-purpose furnace; the guiding mechanism comprises two supporting frames located on one side of the gas nitriding furnace and a transverse moving assembly fixedly installed on the surfaces of the two supporting frames. By means of the composite heat treatment process, a high-hardness layer can be formed on the surface of the cam, the hardness of the surface of the cam is about 30 HV0.3 higher than that of the surface of the cam treated through a conventional heat treatment process, abrasion resistance can be remarkably improved, and the effect of prolonging the service life of a product is achieved; the cam can be automatically transferred, taken and placed in the composite heat treatment process, the effect of the composite heat treatment process on the cam is guaranteed, and the machining efficiency of the cam is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, and in particular to a composite heat treatment device and a treatment method for a cam of an automobile engine. Background Art

[0002] Cam products are widely used in many fields such as the automotive industry and the machinery industry. They are in a state of constant reciprocating motion when working, and their surfaces are prone to wear and fatigue damage, so the surface must have higher hardness and higher wear resistance.

[0003] At present, the commonly used material for automobile engine cams is GCr15. The conventional heat treatment process is tempering after quenching in a protective atmosphere. The surface hardness after treatment is about 60HRC (700HV0.3). The wear resistance of the cam with this hardness is short, and the service life is short. Therefore, a composite heat treatment process is considered to improve the surface hardness and wear resistance and extend the service life of the cam. Summary of the invention

[0004] In view of the above problems existing in the existing automobile engine cam composite heat treatment device, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a composite heat treatment device for an automobile engine cam.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising: A heat treatment mechanism, comprising a gas nitriding furnace, wherein the heat treatment mechanism comprises a controllable atmosphere multi-purpose furnace fixedly arranged on one side of the gas nitriding furnace, and a tempering furnace fixedly arranged on one side of the controllable atmosphere multi-purpose furnace; The guide mechanism comprises a support frame located at one side of the gas nitriding furnace, the number of the support frames is two, and a transverse movement assembly fixedly mounted on the surfaces of the two support frames; And, a lifting mechanism fixedly arranged directly above the transverse movement assembly, and a pick-and-place mechanism located above the lifting mechanism.

[0007] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the transverse movement assembly includes a same positioning column fixedly connected to the one side surface of the two support frames, a first motor adapted to be installed on the one side surface of one of the support frames, a first screw rod fixedly connected to the output end of the first motor, a positioning block slidably connected to the surface of the positioning column, a first internal thread block threadedly connected to the surface of the first screw rod, and a same connecting plate fixedly connected to the positioning block and one side of the outer surface of the first internal thread block.

[0008] As a preferred solution of the automobile engine cam composite heat treatment device of the present invention, the lifting mechanism includes a mounting box fixedly connected to the top surface of the connecting plate, and a driving component fixedly installed on the surface of the mounting box.

[0009] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the driving assembly includes a second motor adapted to be installed on one side of the outer surface of the mounting box, a worm fixedly connected to the output end of the second motor, a support plate fixedly installed on the inner wall surface of the mounting box, and an internal threaded column rotatably connected to the inner surface of the support plate.

[0010] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the drive assembly also includes a worm gear fixedly connected to one end of the internal thread column, a second screw rod threadedly connected to the inner surface of the internal thread column, a limiting groove opened on the surface of the second screw rod, and a positioning rod fixedly installed on one side of the inner surface of the mounting box.

[0011] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the picking and placing mechanism includes a fixing box fixedly connected to one end of the second screw rod, a telescopic component located on the surface of the fixing box, and a clamping component fixedly arranged on one side surface of the telescopic component.

[0012] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the telescopic assembly includes a fixing plate fixedly connected to the top surface of the fixing box, a third motor adapted to be installed in the inner cavity of the fixing box, a gear fixedly connected to the output end of the fixing plate, and a slide rail fixedly installed on the top surface of the fixing plate.

[0013] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the telescopic assembly also includes a rack slidably connected to the inner surface of one of the slide rails, a support rod slidably connected to the inner surface of the other slide rail, and a limit rod fixedly connected to the rack and one end of the support rod.

[0014] As a preferred solution of the automobile engine cam composite heat treatment device described in the present invention, the clamping assembly includes a same fixing frame fixedly connected to the rack and the other end of the support rod, a fixing frame fixedly connected to the inner surface of the fixing frame, a fourth motor adapted to be installed on one side of the outer surface of the fixing frame, a double-headed screw fixedly connected to the output end of the fourth motor, a second internal thread block threadedly connected to the surface of the fourth motor, and a cam clamp fixedly installed on one side of the outer surface of the second internal thread block.

[0015] The present invention also provides a processing method.

[0016] The present invention provides the following technical solution: a treatment method, comprising the above-mentioned automobile engine cam composite heat treatment device, the method comprising the following steps: S1: After controlling the fourth motor to clamp and fix the cam, the fourth motor is turned off and the first motor is turned on, and after the cam clamp and the cam are moved to a suitable position, the first motor is turned off; S2: After controlling the second motor to move the cam fixture and the cam to a suitable height, the second motor is turned off, and the third motor is turned on to move the cam into the gas nitriding furnace, and the output end of the fourth motor is controlled to reverse, and the cam is placed inside the gas nitriding furnace; S3: nitrogen replacement is introduced, and after the temperature is raised to 580°C, nitrogen replacement is stopped, and ammonia and carbon dioxide are introduced for co-penetration treatment. After cooling down after 6 hours, nitrogen replacement is introduced at the same time, and the temperature is lowered to below 80°C before being taken out of the furnace; S4: by repeating the clamping and placing actions of S1 and S2, the cam is sent into a multi-purpose furnace with a controlled atmosphere, the temperature is raised to 840°C, and after being kept at this temperature for 90 minutes, it is automatically pulled into the front room for quenching, and then cooled in 60°C oil for 10 minutes before being taken out of the furnace, wherein the protective atmosphere is methanol and propane atmosphere; S5: Repeat the clamping and placing actions of S1 and S2, put the cam into the tempering furnace, raise the temperature to 240°C, keep the temperature for 120 minutes and then take it out of the furnace.

[0017] The beneficial effects of the present invention are as follows: through the composite heat treatment process of the present invention, a high hardness layer can be formed on the cam surface, which is about 30HV0.3 higher than the cam surface hardness treated by the conventional heat treatment process, and can significantly improve the wear resistance to achieve the effect of extending the service life of the product. Through the cooperation of the guiding mechanism, the lifting mechanism, the picking and placing mechanism and the heat processing mechanism, the transfer and picking and placing of the cam in the composite heat processing process can be automatically completed, thereby ensuring the effect of the composite heat treatment process on the cam and greatly improving the processing efficiency of the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure of the guide mechanism in the present invention.

[0020] Figure 3For the present invention Figure 2 A schematic diagram of the enlarged local structure at point A in the middle.

[0021] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the local structure at point B in the middle.

[0022] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the local structure at point C in the middle.

[0023] Figure 6 It is a schematic diagram of the internal structure of the lifting mechanism in the present invention.

[0024] Figure 7 It is a schematic diagram of the internal structure of the fixing box in the present invention.

[0025] Figure 8 It is a schematic diagram of the overall structure of the clamping assembly in the present invention.

[0026] Fig. 9 It is a curve diagram of the conventional heat treatment process of the cam in the prior art.

[0027] Fig.10 It is a curve diagram of the cam composite heat treatment process in the present invention.

[0028] In the figure: 100, hot working mechanism; 101, gas nitriding furnace; 102, multi-purpose furnace with controlled atmosphere; 103, tempering furnace; 200, guide mechanism; 201, support frame; 202, traverse assembly; 202a, positioning column; 202b, first motor; 202c, first screw rod; 202d, positioning block; 202e, first internal thread block; 202f, connecting plate; 300, lifting mechanism; 301, mounting box; 302, driving assembly; 302a, second motor; 302b, worm; 302c, support plate; 302d, internal thread column; 302e, worm gear; 302f, second screw rod; 302g, limit groove; 302h, positioning rod; 400, pick-and-place mechanism; 401, fixed box; 402, telescopic assembly; 402a, fixed plate; 402b, third motor; 402c, gear; 402d, slide rail; 402e, rack; 402f, support rod; 402g, limit rod; 403, clamping assembly; 403a, fixed frame; 403b, fixed frame; 403c, fourth motor; 403d, double-headed screw rod; 403e, second internal thread block; 403f, cam clamp. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Example 1

[0034] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a composite heat treatment device for a cam of an automobile engine, the device comprising: The heat treatment mechanism 100 includes a gas nitriding furnace 101, the heat treatment mechanism 100 includes a controlled atmosphere multi-purpose furnace 102 fixedly arranged on one side of the gas nitriding furnace 101, and a tempering furnace 103 fixedly arranged on one side of the controlled atmosphere multi-purpose furnace 102; Among them, the gas nitriding furnace 101 can perform gas nitrocarburizing treatment on the cam. After the carbon nitriding treatment, a nitriding layer of about 0.65 mm is formed on the surface of the cam, the surface white bright layer is about 20 um, and the surface hardness is about 600HV0.3. After the controlled atmosphere multi-purpose furnace 102 performs protective atmosphere quenching treatment on the cam, the surface hardness of the cam can reach above 900HV0.3. After the cam is tempered in the tempering furnace 103, the surface hardness of the cam is about 730HV0.3, and the structure is tempered nitrogen-containing martensite and dispersed carbonitrides.

[0035] The guide mechanism 200 includes a support frame 201 located at one side of the gas nitriding furnace 101, the number of the support frames 201 is two, and a transverse movement assembly 202 fixedly mounted on the surfaces of the two support frames 201; The support frame 201 is used to support the transverse moving assembly 202, so that each component in the transverse moving assembly 202 can drive the cam to move laterally.

[0036] Also, a lifting mechanism 300 fixedly disposed directly above the transverse moving assembly 202 , and a pick-and-place mechanism 400 located above the lifting mechanism 300 .

[0037] Among them, the lifting mechanism 300 and the pick-and-place mechanism 400 are moved to appropriate positions through the transverse movement component 202, and then the pick-and-place mechanism 400 is moved to an appropriate height through the lifting mechanism 300. Through the direct cooperation of various components in the pick-and-place mechanism 400, the cam can be placed in the heat treatment box or the cam can be taken out of the heat treatment box.

[0038] Furthermore, the transverse movement assembly 202 includes a same positioning column 202a fixedly connected to the side surface of the two support frames 201, a first motor 202b adapted to be installed on the side surface of one of the support frames 201, a first screw rod 202c fixedly connected to the output end of the first motor 202b, a positioning block 202d slidably connected to the surface of the positioning column 202a, a first internal thread block 202e threadedly connected to the surface of the first screw rod 202c, and a same connecting plate 202f fixedly connected to one side of the outer surface of the positioning block 202d and the first internal thread block 202e.

[0039] Among them, the output end of the first motor 202b passes through the surface of one of the support frames 201 and is fixedly connected to one end of the first screw rod 202c. The other end of the first screw rod 202c is fixedly installed on the side surface of the other support frame 201 through a bearing. Through the cooperation of the support frame 201, the positioning column 202a and the connecting plate 202f, the first internal thread block 202e can be limited. When the first motor 202b drives the first screw rod 202c to rotate, the first internal thread block 202e can drive the connecting plate 202f, the positioning block 202d, the lifting mechanism 300 and the pick-and-place mechanism 400 to perform synchronous linear motion.

[0040] When in use, the first motor 202b is turned on, so that the output end of the first motor 202b drives the first screw rod 202c to rotate synchronously, and the first internal thread block 202e is limited by the cooperation of the support frame 201, the positioning column 202a and the connecting plate 202f, so that the first internal thread block 202e drives the connecting plate 202f, the positioning block 202d, the lifting mechanism 300 and the picking and placing mechanism 400 to perform synchronous linear motion. After the lifting mechanism 300 and the picking and placing mechanism 400 are driven to a suitable position, the first motor 202b is turned off.

[0041] In summary, the guide mechanism 200 can drive the lifting mechanism 300 and the pick-and-place mechanism 400 to a suitable position, and then through the cooperation between the various components in the lifting mechanism 300 and the pick-and-place mechanism 400, the cam is placed in the hot working mechanism 100, or taken out from the hot working mechanism 100, so as to achieve a composite treatment effect of continuously performing carbon co-diffusion, quenching and tempering treatment on the cam.

[0042] Example 2

[0043] Reference Figure 4 and Figure 6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that a lifting mechanism 300 is provided which can adjust the pick-and-place mechanism 400 to a suitable height for picking up and placing the cam.

[0044] Furthermore, the lifting mechanism 300 includes a mounting box 301 fixedly connected to the top surface of the connecting plate 202 f , and a driving assembly 302 fixedly installed on the surface of the mounting box 301 .

[0045] The connecting plate 202f is used to support the installation box 301, and the installation box 301 is used to support various components in the driving assembly 302.

[0046] Furthermore, the driving assembly 302 includes a second motor 302a adapted to be installed on one side of the outer surface of the installation box 301, a worm 302b fixedly connected to the output end of the second motor 302a, a support plate 302c fixedly installed on the inner wall surface of the installation box 301, and an internal threaded column 302d rotatably connected to the inner surface of the support plate 302c.

[0047] Among them, the output end of the second motor 302a passes through the inner cavity of the installation box 301 and is connected to one end of the worm 302b. The other end of the worm 302b is fixedly installed on the side surface of the inner wall of the installation box 301 through a bearing. When the output end of the second motor 302a rotates, it can drive the worm 302b to rotate synchronously. The support plate 302c is used to support the internal threaded column 302d to prevent the position of the internal threaded column 302d from shifting.

[0048] Preferably, the drive assembly 302 also includes a worm gear 302e fixedly connected to one end of the internal threaded column 302d, a second screw rod 302f threadedly connected to the inner surface of the internal threaded column 302d, a limiting groove 302g opened on the surface of the second screw rod 302f, and a positioning rod 302h fixedly installed on one side of the inner surface of the installation box 301.

[0049] Among them, the spiral pattern of the worm 302b is meshed with the worm gear teeth of the worm wheel 302e. When the worm 302b rotates, it can drive the worm wheel 302e to rotate, so that the worm wheel 302e drives the internal threaded sleeve 302d to rotate synchronously. One end of the second screw rod 302f extends to the outside of the fixed box 301, and the positioning rod 302h is inserted into the limiting groove 302g. Through the limiting of the positioning rod 302h by the fixed box 301, the positioning rod 302h is limited by the cooperation with the limiting groove 302g to limit the second screw rod 302f, so that the second screw rod 302f can perform linear motion through the rotation of the internal threaded column 302d.

[0050] When in use, turn on the second motor 302a to drive the worm 302b to rotate synchronously, so that the worm 302b drives the worm wheel 302e to rotate and rotate with the internal threaded column 302d, and the positioning rod 302h is limited by the fixed box 301, and the second screw rod 302f is limited by the cooperation of the positioning rod 302h and the limiting groove 302g, so that the second screw rod 302f drives the release mechanism 400 to move in a straight line through the rotation of the internal threaded column 302d. After the second screw rod 302f drives the release mechanism 400 to move to an appropriate height, the second motor 302a is turned off.

[0051] In summary, the pick-and-place mechanism 400 is adjusted to an appropriate height through the lifting mechanism 300, so that the pick-and-place mechanism 400 can put the cam into the hot working mechanism 100, or take it out from the hot working mechanism 100, so as to achieve the composite treatment effect of continuously performing carbon co-diffusion, quenching and tempering treatment on the cam.

[0052] Example 3

[0053] Reference Figure 3 , Figure 5 , Figure 7 and Figure 8 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: a pick-and-place mechanism 400 is provided for moving the clamping assembly 403 to a suitable position and picking up and placing the cam through a telescopic assembly 402.

[0054] Furthermore, the pick-and-place mechanism 400 includes a fixing box 401 fixedly connected to one end of the second screw rod 302 f , a telescopic component 402 located on the surface of the fixing box 401 , and a clamping component 403 fixedly disposed on one side surface of the telescopic component 402 .

[0055] The fixing box 401 is used to support the components in the telescopic assembly 402, so that the telescopic assembly 402 can move the clamping assembly 403 to a suitable position to pick up and place the cam.

[0056] Furthermore, the telescopic assembly 402 includes a fixed plate 402a fixedly connected to the top surface of the fixed box 401, a third motor 402b adapted to be installed in the inner cavity of the fixed box 401, a gear 402c fixedly connected to the output end of the fixed plate 402a, and a slide rail 402d fixedly installed on the top surface of the fixed plate 402a.

[0057] The output end of the third motor 402b penetrates the top surface of the fixing plate 402a and is fixedly connected to the gear 402c. When the output end of the third motor 402b rotates, it can drive the gear 402c to rotate synchronously.

[0058] Preferably, the telescopic assembly 402 also includes a rack 402e slidably connected to the inner surface of one of the slide rails 402d, a support rod 402f slidably connected to the inner surface of the other slide rail 402d, and a limiting rod 402g fixedly connected to one end of the rack 402e and the support rod 402f.

[0059] Among them, the two slide rails 402d are used to support the rack 402e and the support rod 402f respectively, and the teeth of the gear 402c are meshed with the teeth of the support rod 402f. The rack 402e is limited by one of the slide rails 402d, so that the rack 402e can move linearly through the rotation of the rack 402e, and then the support rod 402f is driven to move synchronously linearly through the cooperation between the rack 402e and the limiting rod 402g.

[0060] It should be noted that the clamping assembly 403 includes a same fixing frame 403a fixedly connected to the rack 402e and the other end of the support rod 402f, a fixing frame 403b fixedly connected to the inner surface of the fixing frame 403a, a fourth motor 403c adapted to be installed on one side of the outer surface of the fixing frame 403b, a double-headed screw 403d fixedly connected to the output end of the fourth motor 403c, a second internal thread block 403e threadedly connected to the surface of the fourth motor 403c, and a cam clamp 403f fixedly installed on one side of the outer surface of the second internal thread block 403e.

[0061] Among them, the fixed frame 403b is used to support the fourth motor 403c, and the output end of the fourth motor 403c passes through the one side surface of the inner wall of the fixed frame 403b, and is fixedly connected to the movement of the double-headed screw rod 403d. The other end of the double-headed screw rod 403d is fixedly installed on the other side surface of the inner wall of the fixed frame 403b through a bearing. The two threads of the double-headed screw rod 403d are in opposite directions. The number of the second internal thread blocks 403e and the cam clamp 403f are two respectively. The two second internal thread blocks 403e are both slidably connected in the fixed frame 403b. Through the limiting of the two second internal thread blocks 403e by the fixed frame 403b, the two second internal thread blocks 403e can drive the two cam clamps 403f to move in opposite directions through the rotation of the double-headed screw rod 403d, so that the two cam clamps 403f clamp and fix the cam.

[0062] When in use, the third motor 402b is turned on to drive the gear 402c to rotate synchronously, and the rack 402e is limited by one of the slide rails 402d, so that the rack 402e performs linear motion through the rotation of the rack 402e, and then the support rod 402f is driven to perform synchronous linear motion through the cooperation of the rack 402e and the limiting rod 402g. After the rack 402e and the support rod 402f drive the fixing frame 403a to move to a suitable position, the third motor 402b is turned off and the fourth motor 403c is turned on, so that the double-headed screw rod 403d of the fourth motor 403c drives the double-headed screw rod 403d to rotate synchronously, and the two second internal thread blocks 403e are limited by the fixing frame 403b, so that the two second internal thread blocks 403e pass The rotation of the double-headed screw 403d drives the two cam clamps 403f to move in opposite directions, so that the two cam clamps 403f clamp and fix the cam. After the cam clamp 403f clamps and fixes the cam, the third motor 402b is reversed to take out the cam, and then the cam is moved to a suitable position by reversing the first motor 202b and the second motor 302a, and then the first motor 202b and the second motor 302a are turned off, and the third motor 402b is turned on again to put the cam into the heat treatment mechanism 100, and the fourth motor 403c is turned over to release the clamping of the cam, and the third motor 402b is reversed again to move the cam clamp 403f to the outside of the heat treatment mechanism 100, so that the heat treatment mechanism 100 performs heat treatment on the cam.

[0063] In summary, through the cooperation between the various components in the telescopic component 402 and the clamping component 403, the cam can be arbitrarily taken and placed in the thermal processing mechanism 100, so as to achieve the effect of facilitating different heat treatment processes for the cam.

[0064] Example 4

[0065] Reference Figure 1 to Figure 8 , which is the fourth embodiment of the present invention, is different from the previous embodiment in that this embodiment provides a processing method, including a composite heat treatment device for an automobile engine cam.

[0066] The device can be applied to an engine cam production line. The heat treatment device comprises a gas nitriding furnace 101, a controlled atmosphere multi-purpose furnace 102 and a tempering furnace 103. The gas nitriding furnace 101 can perform gas nitrocarburizing treatment on the cam. After the carbon nitriding treatment, a nitriding layer of about 0.65 mm is formed on the surface of the cam, a surface white bright layer of about 20 um, and a surface hardness of about 600 HV0.3. After the controlled atmosphere multi-purpose furnace 102 performs protective atmosphere quenching treatment on the cam, the surface hardness of the cam can reach above 900 HV0.3. After the cam is tempered in the tempering furnace 103, the surface hardness of the cam is about 730 HV0.3, and the structure is tempered nitrogen-containing martensite and dispersed carbonitrides. The cam material is GCr15, and the state before treatment is spheroidizing annealing.

[0067] The specific processing methods are as follows: S1: After controlling the fourth motor 403c to clamp and fix the cam, the fourth motor 403c is turned off, the first motor 202b is turned on to move the cam clamp 403f and the cam to a suitable position, and then the first motor 202b is turned off; S2: After controlling the second motor 302a to move the cam fixture 403f and the cam to a suitable height, the second motor 302a is turned off, and the third motor 402b is turned on to move the cam into the gas nitriding furnace 101, and the output end of the fourth motor 403c is controlled to reverse, and the cam is placed inside the gas nitriding furnace 101; S3: nitrogen is introduced for replacement. After the temperature is raised to 580°C, nitrogen replacement is stopped, and ammonia and carbon dioxide are introduced for co-penetration treatment. After cooling down after 6 hours, nitrogen is introduced for replacement at the same time. The temperature is lowered to below 80°C and the furnace is taken out. After gas nitrocarburizing treatment, a nitriding layer of about 0.65mm is formed on the surface of the cam, the surface white bright layer is about 20um, and the surface hardness is about 600HV0.3; S4: By repeating the clamping and placing actions of S1 and S2, the cam is sent into the multi-purpose furnace 102 with controlled atmosphere, and the temperature is raised to 840°C. After being kept at this temperature for 90 minutes, the cam is automatically pulled to the front room for quenching, and then cooled in 60°C oil for 10 minutes before being taken out of the furnace. The protective atmosphere is methanol + propane atmosphere. After the protective atmosphere quenching treatment, the surface hardness of the cam can reach above 900HV0.3; S5: Repeat the clamping and placing actions of S1 and S2, put the cam into the tempering furnace 103, raise the temperature to 240°C, keep it warm for 120 minutes and then take it out of the furnace, and cool it naturally in the air. After tempering, the surface hardness of the cam is about 730HV0.3, and the structure is tempered nitrogen-containing martensite and dispersed carbon and nitrogen compounds.

[0068] In summary, through the composite heat treatment process of the present invention, a high hardness layer can be formed on the cam surface. Compared with the cam surface treated by the conventional heat treatment process, the hardness is about 30HV0.3 higher, which can significantly improve the wear resistance and achieve the effect of extending the service life of the product.

[0069] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0070] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A composite heat treatment device for automobile engine cam, characterized in that: include, A heat treatment mechanism (100) comprises a gas nitriding furnace (101), wherein the heat treatment mechanism (100) comprises a controllable atmosphere multi-purpose furnace (102) fixedly arranged on one side of the gas nitriding furnace (101), and a tempering furnace (103) fixedly arranged on one side of the controllable atmosphere multi-purpose furnace (102); A guide mechanism (200) comprising a support frame (201) located at one side of the gas nitriding furnace (101), wherein the number of the support frames (201) is two, and a transverse movement assembly (202) fixedly mounted on the surfaces of the two support frames (201); Also, a lifting mechanism (300) fixedly arranged directly above the transverse movement component (202), and a pick-and-place mechanism (400) located above the lifting mechanism (300).

2. The automobile engine cam composite heat treatment device according to claim 1, characterized in that: The transverse movement assembly (202) comprises a same positioning column (202a) fixedly connected to the side surface of the two support frames (201), a first motor (202b) adapted to be installed on the side surface of one of the support frames (201), a first screw rod (202c) fixedly connected to the output end of the first motor (202b), a positioning block (202d) slidably connected to the surface of the positioning column (202a), a first internal thread block (202e) threadedly connected to the surface of the first screw rod (202c), and a same connecting plate (202f) fixedly connected to one side of the outer surface of the positioning block (202d) and the first internal thread block (202e).

3. The composite heat treatment device for automobile engine cam according to claim 2, characterized in that: The lifting mechanism (300) comprises a mounting box (301) fixedly connected to the top surface of the connecting plate (202f), and a driving assembly (302) fixedly mounted on the surface of the mounting box (301).

4. The composite heat treatment device for automobile engine cam according to claim 3, characterized in that: The driving assembly (302) comprises a second motor (302a) adapted to be mounted on one side of the outer surface of the installation box (301), a worm (302b) fixedly connected to the output end of the second motor (302a), a support plate (302c) fixedly mounted on the inner wall surface of the installation box (301), and an internal threaded column (302d) rotatably connected to the inner surface of the support plate (302c).

5. The composite heat treatment device for automobile engine cam according to claim 4, characterized in that: The drive assembly (302) further comprises a worm gear (302e) fixedly connected to one end of the internal threaded column (302d), a second screw rod (302f) threadedly connected to the inner surface of the internal threaded column (302d), a limiting groove (302g) provided on the surface of the second screw rod (302f), and a positioning rod (302h) fixedly mounted on one side of the inner surface of the installation box (301).

6. The automobile engine cam composite heat treatment device according to claim 5, characterized in that: The pick-and-place mechanism (400) comprises a fixing box (401) fixedly connected to one end of the second screw rod (302f), a telescopic component (402) located on the surface of the fixing box (401), and a clamping component (403) fixedly arranged on a side surface of the telescopic component (402).

7. The automobile engine cam composite heat treatment device according to claim 6, characterized in that: The telescopic assembly (402) comprises a fixing plate (402a) fixedly connected to the top surface of the fixing box (401), a third motor (402b) adapted to be installed in the inner cavity of the fixing box (401), a gear (402c) fixedly connected to the output end of the fixing plate (402a), and a slide rail (402d) fixedly installed on the top surface of the fixing plate (402a).

8. The automobile engine cam composite heat treatment device according to claim 7, characterized in that: The telescopic assembly (402) further comprises a rack (402e) slidably connected to the inner surface of one of the slide rails (402d), a support rod (402f) slidably connected to the inner surface of another of the slide rails (402d), and a same limiting rod (402g) fixedly connected to the rack (402e) and one end of the support rod (402f).

9. The automobile engine cam composite heat treatment device according to claim 8, characterized in that: The clamping assembly (403) comprises a same fixing frame (403a) fixedly connected to the rack (402e) and the other end of the support rod (402f), a fixing frame (403b) fixedly connected to the inner surface of the fixing frame (403a), a fourth motor (403c) adapted to be mounted on one side of the outer surface of the fixing frame (403b), a double-headed screw (403d) fixedly connected to the output end of the fourth motor (403c), a second internal thread block (403e) threadedly connected to the surface of the fourth motor (403c), and a cam clamp (403f) fixedly mounted on one side of the outer surface of the second internal thread block (403e).

10. A processing method, characterized in that: The composite heat treatment device for the cam of an automobile engine according to claim 9 comprises the following steps: S1: After controlling the fourth motor to clamp and fix the cam, the fourth motor is turned off and the first motor is turned on, and after the cam clamp and the cam are moved to a suitable position, the first motor is turned off; S2: After controlling the second motor to move the cam fixture and the cam to a suitable height, the second motor is turned off, and the third motor is turned on to move the cam into the gas nitriding furnace, and the output end of the fourth motor is controlled to reverse, and the cam is placed inside the gas nitriding furnace; S3: nitrogen replacement is introduced, and after the temperature is raised to 580°C, nitrogen replacement is stopped, and ammonia and carbon dioxide are introduced for co-penetration treatment. After cooling down after 6 hours, nitrogen replacement is introduced at the same time, and the temperature is lowered to below 80°C before being taken out of the furnace; S4: by repeating the clamping and placing actions of S1 and S2, the cam is sent into a multi-purpose furnace with a controlled atmosphere, the temperature is raised to 840°C, and after being kept at this temperature for 90 minutes, it is automatically pulled into the front room for quenching, and then cooled in 60°C oil for 10 minutes before being taken out of the furnace, wherein the protective atmosphere is methanol and propane atmosphere; S5: Repeat the clamping and placing actions of S1 and S2, put the cam into the tempering furnace, raise the temperature to 240°C, keep the temperature for 120 minutes and then take it out of the furnace.

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