CN118664084A - Laser welding process method for shifting fork assembly - Google Patents

Abstract

The present invention relates to a laser welding process method for a fork assembly, comprising the following specific steps: stamping and forming the fork, the shift block and the bracket constituting the fork assembly, using a laser generator to sequentially weld the multiple welds on the fork assembly, each weld adopts a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding; then, the assembly hole of the fork assembly is processed, and it is inspected and cleaned. The beneficial effect of the present invention is that the process is simple, and the rapid welding of the fork assembly can be realized. The complex integral fork can be decomposed into several simple parts, and combined into a precision stamped and welded fork assembly by laser welding, which can not only give play to the advantages of low cost of stamping fork, suitable for mass production, and environmentally friendly manufacturing; but also solve the problems of complex stamping mold of integral fork, difficult parts process and high manufacturing cost.

Description

Laser welding process for fork assembly

Technical Field

The invention relates to the technical field of automobile component processing, and in particular to a laser welding process method for a shift fork assembly.

Background Art

The shift fork is the core component of the automobile gearbox. It is connected to the shift handle and the middle shift wheel is turned to change the input/output speed ratio and switch gears. Conventional shift forks are cast, forged, and stamped according to the process. Cast shift forks have low costs, but are large in size, have certain casting defects, and have certain pollution in the casting process; forged shift forks have excellent mechanical properties and can adapt to complex structures, but the manufacturing cost is relatively high; stamped shift forks are made by cold forming steel plates. The advantages are that they are suitable for mass production, low cost, and environmentally friendly manufacturing processes. The disadvantages are that the stamping molds are complex and the parts manufacturing process is complex.

Traditional stamped fork steel plates are blanked and then processed through multiple cold forming processes, which has many steps, complex molds and complicated manufacturing processes.

Summary of the invention

The invention provides a laser welding process method for a shift fork assembly, aiming to solve the problems in the prior art.

The technical solution of the present invention to solve the above technical problems is as follows:

A laser welding process for a fork assembly includes the following specific steps:

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

The beneficial effects of the present invention are as follows: during the welding process, a laser generator is used to sequentially weld multiple welds on the fork assembly, each weld is welded in a reciprocating manner, and each weld is welded in a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding;

The welding method ensures that the welding strength of the shift fork is high and it is not easy to deform during the processing, thereby ensuring the welding quality of the shift fork.

The process of the invention is simple and can realize rapid welding of the fork assembly. The complex integral fork can be decomposed into several simple parts, which are combined into a precision stamped and welded fork assembly by laser welding. The invention can not only give play to the advantages of low cost of stamped forks, suitability for mass production and environmentally friendly manufacturing, but also solve the problems of complex stamping molds for integral forks, difficult parts processing and high manufacturing costs.

Based on the above technical solution, the present invention can also be improved as follows.

Furthermore, the welding penetration of a single weld is greater than 3 mm.

The beneficial effect of adopting the above further solution is that the welding penetration depth is reasonably designed, which ensures the strength of the welding structure of the fork assembly and guarantees the quality of the fork assembly.

Furthermore, the power range in the power ramp adjustment method in S1 is: 0-3.2KW.

The beneficial effect of adopting the above further solution is that the welding power is reasonably designed, the appearance of the weld is improved, the quality of the welding is guaranteed, and local thin weaknesses are avoided.

Furthermore, the laser spot energies generated by the laser generator in S1 are respectively: central beam+annular beam.

The beneficial effect of adopting the above further scheme is that the central beam + annular beam is reasonably designed, so that the area outside the welding area can also be heated, avoiding the formation of depressions due to local overtemperature of the fork assembly, and ensuring the quality of the fork assembly welding.

Furthermore, the wavelength range of the laser generated by the laser generator in S1 is 780-980 mm.

The beneficial effect of adopting the above further scheme is that the laser in this wavelength range is reasonably designed, which can improve the absorption rate of the metal to the laser and reduce spatter.

Furthermore, the step S1 includes S2: machining two assembly holes on the shift fork assembly welded in the step S1.

The beneficial effect of adopting the above further solution is that the two assembly holes are processed reasonably, which is convenient for the subsequent assembly of the shift fork assembly.

Furthermore, the step S2 includes S3: using a comprehensive inspection tool to inspect the shift fork assembly processed in S2.

The beneficial effect of adopting the above further scheme is that after the welding of the fork assembly is completed, the functional dimensions of the fork assembly such as the staggered degree of the fork legs, the width of the fork fork mouth, the opening position dimension of the shift block, the position dimension of the shift block surface, the position dimension of the interlocking arc, and the concentricity of the bushing hole are inspected using a comprehensive inspection fixture to ensure that the functional dimensions and assembly dimensions of the fork assembly meet the technical requirements and ensure the quality of the fork assembly processing.

Furthermore, after S3, S4 is included: using a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

The beneficial effect of adopting the above further scheme is that the cleaning steps are reasonably designed, and metal residues on the surface of the parts are separated from the parts through high-pressure spraying, thereby ensuring that the parts are clean and meet the assembly and use requirements.

Furthermore, the step S1 includes S0: stamping the shift fork, the shift block and the bracket constituting the shift fork assembly.

The beneficial effect of adopting the above further solution is to stamp and form the shift fork, shift block and bracket that constitute the shift fork assembly, so as to facilitate the subsequent welding between the shift fork, shift block and bracket.

Furthermore, the S0 also includes: preparing materials for stamping the shift fork, the shift block and the bracket.

The beneficial effect of adopting the above further solution is to prepare materials for stamping the shift fork, the shift block and the bracket so as to facilitate the subsequent welding between the shift fork, the shift block and the bracket.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of the welding process of the shift fork assembly in the present invention;

FIG2 is a schematic structural diagram of the shift fork assembly of the present invention;

FIG3 is a schematic diagram of welds 1 to 3 in the shift fork assembly of the present invention;

FIG4 is a schematic diagram of weld seams 5 and 6 in the shift fork assembly of the present invention;

FIG. 5 is a schematic diagram of the weld 4 in the shift fork assembly of the present invention.

In the accompanying drawings, the components represented by the reference numerals are listed as follows:

1. Shift fork; 2. Shift block; 3. Bracket.

DETAILED DESCRIPTION

It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

Example 1

As shown in FIGS. 1 to 5 , this embodiment provides a laser welding process for a fork assembly, including the following specific steps:

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

During the welding process, a laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding;

The welding method ensures that the welding strength of the shift fork is high and it is not easy to deform during the processing, thereby ensuring the welding quality of the shift fork.

Based on the above scheme, the above laser power slope adjustment is a technical means in laser processing, which is used to adjust the rate of change of laser output power. By adjusting the laser slope, different powers can be achieved in each welding stage, thereby improving the welding quality of components.

In order to reduce the deformation of the fork during welding, the following process methods are adopted:

During the welding process, add low-power pre-welding (high power can easily cause large deformation of the workpiece): the first step is to use low power (1000W) to quickly connect the parts to be welded together, and the second step is to complete the welding of the final product according to the power in the table below. Using low-power welding can effectively connect and fix the parts, while ensuring the welding position accuracy of each part, with small welding stress and deformation, avoiding the use of high-power welding for the first time, which will increase the welding stress and deformation of the parts;

Influence of welding sequence: Reasonable welding sequence plays a key role in welding deformation. According to process verification, welding in the order of the following weld diagram (weld 1 to weld 6) is the welding sequence with the smallest deformation;

Preferably, in this embodiment, when welding the fork assembly, there are a total of six welds to be welded, and the six welds are weld 1, weld 2, weld 3, weld 4, weld 5 and weld 6 (refer to Figures 3 to 5). The optimized welding parameters of the six welds are shown in Table 1 below:

Table 1 Welding parameters

Principles for selecting welding parameters: Adopting orthogonal test (orthogonal test design: another design method for studying multiple factors and multiple levels, it selects some representative points from a comprehensive test for testing based on orthogonality) scheme, various parameter combinations are selected to select a set of welding parameters with the smallest deformation.

Based on the above scheme, when welding a single weld, first weld from the starting point of the weld to the end point of the weld, and then weld again from the end point of the weld to the starting point to ensure the strength of the welded structure.

In addition, when welding a single weld, the power of the laser generator gradually increases from the starting point to the end point, and the power of the laser generator gradually decreases from the end point to the starting point. This solution is reasonably designed, and the use of low-power welding can effectively connect and fix the components. While ensuring the welding position accuracy of each component, the welding stress and deformation are small, avoiding the increase of welding stress and deformation between the components caused by the first use of high-power welding.

The process of this embodiment is simple and can realize rapid welding of the fork assembly. The complex integral fork can be decomposed into several simple parts, which are combined into a precision stamped and welded fork assembly by laser welding. This can not only give play to the advantages of low cost of stamped forks, suitability for mass production, and environmentally friendly manufacturing; it can also solve the problems of complex stamping molds for integral forks, difficult parts processing, and high manufacturing costs.

Example 2

Based on Example 1, in this example, the welding penetration of a single weld is greater than 3 mm.

The welding penetration depth is reasonably designed to ensure the strength of the welding structure of the fork assembly and the quality of the fork assembly.

In order to ensure the strength of the welded structure, the welding depth of a single weld is required to be greater than 3mm, but a large welding depth means a higher energy input, which has the unfavorable consequence of greater welding thermal deformation. In order to minimize the influence of thermal deformation while ensuring welding depth, a negative defocus welding method is adopted to increase the welding depth, that is, to make the focus of the laser beam at an appropriate position below the surface of the part, thereby achieving the purpose of reducing welding power input and improving thermal deformation while ensuring welding depth.

Preferably, in this embodiment, the welding penetration of the above-mentioned single weld is preferably 5 mm.

In order to reduce welding spatter, the following process methods are adopted:

The characteristic of laser welding is that its energy input intensity is very high in a very short time, which easily leads to the loss of metal splashes and the formation of obvious arc pits at the welding point. In order to improve the appearance of the weld and ensure the welding quality, and avoid local weak points, the power ramp method is adopted to make the welding power have a transition zone where it gradually changes and increases according to the setting at the welding point, effectively eliminating the arc pit and improving the appearance. Correspondingly, the reverse power ramp method is also used at the arc ending point of laser welding, so that the welding power gradually changes and decreases according to the setting, and a better arc ending effect is obtained.

Adjust the laser spot energy distribution: avoid using Gaussian distribution beams and change to annular + central beams to lower the center temperature and reduce the generation of metal gas;

Use short-wavelength laser: Short-wavelength laser can increase the metal's absorption rate of laser and reduce spatter;

Keep the welding surface clean: The presence of contaminants on the material surface can easily lead to the formation of gas under high welding temperature, which is also the cause of welding spatter. Adding a pre-weld cleaning process before the welding process to ensure that the welding surface is clean and free of oil, impurities or oxides can effectively reduce the generation of welding spatter.

Based on the above scheme, the above-mentioned laser generator adopts the 4KW solid laser generator in the existing technology. During the welding process, a welding workstation composed of a 4KW solid laser generator, a fiber laser welding head and a 6-axis robot is used, as well as a pneumatic clamping welding fixture installed and fixed on a rotary positioner. The multiple single pieces of the shift fork, shift block and bracket are clamped and positioned, and then laser welded to form a shift fork assembly.

It should be noted that the above-mentioned devices all adopt existing technologies, and their specific structures and principles will not be described in detail here.

A single fork assembly has a total of 6 welds, which are distributed in different locations due to differences in the combination structure of the parts. During the welding process, it is necessary to control the rotation and displacement of the positioner so that each weld is transformed to a position and angle suitable for welding without blocking the laser beam. The rotation and displacement of the positioner is controlled by the welding workstation in conjunction with the welding program compiled by the debugging. The entire welding process is fast and smooth, with a welding speed of 3000mm/min. The welding cycle of a single fork assembly is only 45s, and the shift output is more than 600 pieces.

Example 3

On the basis of the above embodiments, in this embodiment, the power range in the power ramp adjustment method in S1 is: 0-3.2KW.

The welding power is reasonably designed, which improves the appearance of the weld and ensures the quality of welding, avoiding local thin weaknesses.

Based on the above scheme, the above laser generator adopts the existing technology, and its specific structure and principle will not be described in detail here.

In addition, the power of the above-mentioned laser generator is 4KW. Usually, the maximum welding power during processing is 80% of the power of the laser generator, so the maximum welding power during welding is 3.2KW.

Preferably, in this embodiment, when the fork assembly is welded, the power of the laser generator from the welding start point to the welding end point varies from 0 to 3.2 KW, while the power of the laser generator from the welding end point to the welding start point varies from 3.2 to 0 KW.

Example 4

On the basis of the above embodiments, in this embodiment, the laser spot energies generated by the laser generator in S1 are respectively: central beam+annular beam.

The reasonable design of the central beam + annular beam allows the area outside the welding area to be heated, avoiding the formation of depressions due to excessive local temperature of the fork assembly and ensuring the welding quality of the fork assembly.

The traditional process only uses the central beam. During the welding process, the temperature of the welding area is significantly higher than that of the areas outside the area, which causes the fork assembly to deform and affects the quality of the fork welding.

Based on the above scheme, the central beam and the ring beam refer to a form of laser beam. The combination of the central beam and the ring beam can effectively improve the welding quality and reduce welding spatter.

Example 5

On the basis of the above embodiments, in this embodiment, the wavelength range of the laser generated by the laser generator in S1 is 780-980 mm.

The laser in this wavelength range is reasonably designed to increase the metal's absorption rate of the laser while reducing spatter.

Preferably, in this embodiment, the wavelength of the laser generated by the laser generator in S1 is preferably 850 mm.

Example 6

On the basis of the above embodiments, in this embodiment, the step S1 includes the following step S2: processing two assembly holes on the shift fork assembly welded in the step S1.

The two assembly holes are processed reasonably to facilitate the subsequent assembly of the fork assembly.

The specific steps of S2 are as follows: use a machining center and a hydraulic fixture to machine the two assembly holes of the fork and the bracket, and the hole diameter after machining is Ф12+0.05 and the coaxiality is 0.1. Put the welded fork assembly into the machining hydraulic fixture, tighten it through the hydraulic cylinder, and then use a drill and a reamer to process the holes respectively.

Based on the above scheme, the specific steps of welding the fork assembly are as follows:

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

S2: Processing two assembly holes on the shift fork assembly welded in S1.

Example 7

On the basis of Example 6, in this embodiment, S2 includes S3 after that: using a comprehensive inspection tool to inspect the shift fork assembly processed in S2.

After the fork assembly is welded, the fork leg stagger, fork fork width, block opening position, block face position, interlocking arc position, bushing hole concentricity and other functional dimensions are inspected using a comprehensive inspection fixture to ensure that the functional dimensions and assembly dimensions of the fork assembly meet the technical requirements and to ensure the quality of the fork assembly processing.

Based on the above scheme, the specific steps of welding the fork assembly are as follows:

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

S2: Processing two assembly holes on the shift fork assembly welded in S1.

S3: Use a comprehensive inspection fixture to inspect the shift fork assembly processed in S2.

Example 8

On the basis of Example 7, in this embodiment, S3 includes S4 after S3: using a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

The cleaning steps are reasonably designed, and metal residues on the surface of parts are separated from the parts through high-pressure spraying, ensuring that the parts are clean and meet the requirements of assembly and use.

Based on the above scheme, the specific steps of welding the fork assembly are as follows:

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

S2: Processing two assembly holes on the shift fork assembly welded in S1.

S3: Use a comprehensive inspection fixture to inspect the shift fork assembly processed in S2.

S4: Use a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

Example 9

On the basis of the above embodiments, in this embodiment, the step before S1 includes S0: stamping the shift fork 1 , the shift block 2 and the bracket 3 constituting the shift fork assembly.

The shift fork, shift block and bracket that make up the shift fork assembly are stamped to facilitate subsequent welding between the shift fork, shift block and bracket.

Based on the above scheme, the specific steps of welding the fork assembly are as follows:

S0: stamping the shift fork 1, the shift block 2 and the bracket 3 constituting the shift fork assembly.

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

S2: Processing two assembly holes on the shift fork assembly welded in S1.

S3: Use a comprehensive inspection fixture to inspect the shift fork assembly processed in S2.

S4: Use a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

Example 10

On the basis of Example 9, in this embodiment, S0 further includes: preparing materials for stamping the shift fork 1 , the shift block 2 and the bracket 3 .

Prepare the materials for stamping the shift fork, shift block and bracket to facilitate the subsequent welding between the shift fork, shift block and bracket.

Based on the above scheme, the S0 includes the following specific steps:

Step 1: Fork material preparation: material brand QSTE500, material specification coil, thickness 6mm, width 230mm;

Step 2: Use a 700T fine-blanking machine and a fork fine-blanking die. The 700T fine-blanking machine automatically feeds the material, and the coil is fed into the space between the upper and lower dies of the die through the unwinding and leveling machine. After the material is fed into the die, the 700T fine-blanking machine drives the fine-blanking die to work, and the die starts to move up and down relative to each other. The punch enters the die, and the fork blank is fine-blanked and sheared out from the material. The shear section is 90% bright sheared;

Step 3: Use a 500T hydraulic press and a fork upsetting die to extrude the fork functional area from 6mm to 5mm; first put the part into the upsetting die, and the 500T hydraulic press drives the upsetting die to work. The upsetting die starts to move up and down relative to each other, and the forward punch and the reverse punch start to extrude the part. The part material starts to flow under the extrusion force, and the thickness of the extruded part of the part starts to decrease from 6mm to 5mm.

Step 4: Use an injection molding machine and a shift fork injection mold to inject 1mm thick PA66 engineering plastic material at the contact point between the shift fork and the gear sleeve to avoid metal impact noise during gear shifting and reduce wear: Place the parts into the injection mold, and the injection molding machine drives the shift fork injection mold to move up and down relative to each other. After the injection mold is completely closed, the injection molding machine will heat the liquid PA66 engineering plastic into the injection mold under high pressure. The PA66 engineering plastic wraps the parts in the mold. After the PA66 engineering plastic cools, a wear-resistant layer with a thickness of 1mm is formed on the surface of the parts.

Step 5: Prepare the block material: material grade 27MnCrB5, material specification coil, thickness 6mm, width 125mm;

Step 6: Use 700T fine blanking machine and shift block fine blanking jump step fine blanking die. The 700T fine blanking machine automatically feeds the material, and the coil is fed into the space between the upper and lower dies of the die through the unwinding and leveling machine. After the material is fed into the die, the 700T fine blanking machine drives the fine blanking die to work, and the die starts to move up and down relative to each other. The first step is punching with the punch, the second step is upsetting and chamfering, and the third step is fine blanking and shearing the shift block from the material. The shear section is 100% bright shearing;

Step 7: Use a high-frequency quenching machine and a high-frequency quenching fixture to perform high-frequency quenching on the functional area of the shift paddle block. The surface hardness is greater than 48HRC and the depth of the hardened layer is 0.7-2mm. Place the part on the high-frequency quenching fixture and the machine starts working. First, the induction coil moves downward and approaches the part. When it is 2mm away from the part, the induction coil stops moving. The machine starts to transfer energy to the part through the induction coil. The surface of the part is heated. When it is heated to 1000 degrees Celsius, the machine releases quenching liquid, and the induction heating area of the part cools rapidly to produce martensite. The hardness of the quenching area is increased to HRC50-55.

Step 8: Prepare the bracket: material brand QSTE500, material specification coil, thickness 6mm, width 136mm;

Step 9: Use 320T fine-blanking machine and bracket fine-blanking die. The 320T fine-blanking machine automatically feeds the material, and the coil is fed into the space between the upper and lower dies of the die through the unwinding and leveling machine. After the material is fed into the die, the 320T fine-blanking machine drives the fine-blanking die to work, and the die starts to move up and down relative to each other, and the bracket blank is fine-blanked from the material, and the shear section is 90% bright sheared;

Step 10: Use a 110T press and a bracket bending mold to bend the bracket at a bending angle of 90 degrees; place the part on the push plate of the bending mold, and position it through the positioning pins. The 110T press drives the upper mold to move downward, and the bending punch contacts the part and continues to move downward. The part is pressed into the die to complete the bending at an angle of 90 degrees. The push plate moves upward to push the bent part out of the die.

Based on the above scheme, the specific steps of welding the fork assembly are as follows:

S0: Prepare materials for stamping the shift fork 1, the shift block 2 and the bracket 3, and perform stamping on the shift fork 1, the shift block 2 and the bracket 3 constituting the shift fork assembly.

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence. Each weld is welded in a reciprocating manner, and each weld is welded using a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding.

S2: Processing two assembly holes on the shift fork assembly welded in S1.

S3: Use a comprehensive inspection fixture to inspect the shift fork assembly processed in S2.

S4: Use a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

The laser welding process of the shift fork assembly provided by the present invention is as follows:

S0: preparing materials for stamping the shift fork 1, the shift block 2 and the bracket 3, and stamping the shift fork 1, the shift block 2 and the bracket 3 constituting the shift fork assembly;

S1: A laser generator is used to weld multiple welds on the fork assembly in sequence, each weld is welded in a reciprocating manner, and each weld is welded in a power ramp method, that is, the welding power of the laser generator gradually increases from the starting point to the end point of welding, and the welding power of the laser generator gradually decreases from the end point of welding to the starting point of welding;

S2: machining two assembly holes on the shift fork assembly welded in S1;

S3: using a comprehensive inspection fixture to inspect the shift fork assembly processed in S2;

S4: Use a high-pressure spray cleaning machine to clean the fork assembly in S3, and the spray pressure of the high-pressure spray cleaning machine is 30-40 bar.

It should be noted that each device involved in the present invention adopts the existing technology, and its specific structure and principle are not described in detail here.

It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The shifting fork assembly laser welding process method is characterized by comprising the following specific steps of:

S1: and a plurality of welding seams on the shifting fork assembly are welded sequentially by adopting a laser generator, each welding seam adopts reciprocating welding, and each welding seam adopts a power slope adjustment method, namely the welding power from a welding starting point to a welding end point laser generator is gradually increased, and the welding power from the welding end point to the welding end point laser generator is gradually reduced.

2. The shift fork assembly laser welding process of claim 1, wherein: the welding penetration of the single welding line is more than 3mm.

3. The shift fork assembly laser welding process method according to claim 1, wherein the power range in the power ramp method in S1 is as follows: 0-3.2KW.

4. The shift fork assembly laser welding process method according to claim 1, wherein the laser spot energy generated by the laser generator in S1 is respectively: center beam + annular beam.

5. The shift fork assembly laser welding process according to claim 1, wherein the wavelength range of the laser generated by the laser generator in S1 is 780-980mm.

6. A shift fork assembly laser welding process according to any one of claims 1-5, wherein S1 is followed by S2: and (2) processing two assembly holes on the shifting fork assembly welded in the step (S1).

7. The shift fork assembly laser welding process of claim 6, wherein S2 is followed by S3: and (2) detecting the shifting fork assembly processed in the step (S2) by adopting a comprehensive detection tool.

8. The shift fork assembly laser welding process of claim 7, wherein S3 is followed by S4: and (3) cleaning the shifting fork assembly by adopting a high-pressure spray type cleaning machine, wherein the spray pressure of the high-pressure spray type cleaning machine is 30-40bar.

9. A shift fork assembly laser welding process according to any one of claims 1-5, wherein S1 is preceded by S0: and (3) stamping and forming a shifting fork (1), a shifting block (2) and a bracket (3) which form the shifting fork assembly.

10. The shift fork assembly laser welding process of claim 9, wherein S0 further comprises: the materials of the stamping shifting fork (1), the shifting block (2) and the bracket (3) are prepared.