A method for manufacturing a high-performance precision welded reinforced piston rod and a piston rod

Abstract

The invention discloses a processing technology for a piston rod, aiming to provide a manufacturing method and a piston rod of a high-performance precision welding-enhanced piston rod with high welding efficiency, good welding quality and high welding strength. The technical scheme of the invention is that a specific notch is arranged on the piston rod. In the process of resistance butt welding or flash butt welding of the piston rod, the notch can concentrate the welding current, improve the heating efficiency of the welding point, reduce the energy and time required for welding, ensure the uniform distribution of the current during welding, and further improve the reliability of welding. The welding of the piston rod adopts the process of resistance butt welding or flash butt welding, has high welding strength after welding, and can optimize the overall process and the finished product to determine the optimal processing technology. The invention is applicable to the technical field of piston rod processing.

Description

Technical Field

[0001] The present invention relates to a processing technology for a piston rod, and more particularly to a manufacturing method for a high-performance precision welded reinforced piston rod and the piston rod. Background Art

[0002] The existing piston rod assembly has no notches on the piston rod, and the piston rod and the limit ring seat are directly butt-welded by resistance welding. The butt welding process will produce welding defects, such as loose welds and overheating of the welding points. These defects will affect the strength and durability of the limit ring seat. Butt welding will produce a heat-affected zone, which will cause changes in material properties, such as increased hardness and decreased toughness, thereby affecting the overall performance of the piston rod. Spot welding will generate internal stresses around the weld. These stresses will cause cracks to form and expand during the operation of the shock absorber, affecting the reliability of the shock absorber. If the retaining ring is poorly welded, it will affect the sealing inside the shock absorber, causing hydraulic oil leakage and affecting the operating efficiency of the shock absorber. Under long-term working conditions of high-frequency vibration and impact, the spot-welded retaining ring will suffer fatigue damage, reducing the service life of the shock absorber. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for manufacturing a high-performance precision welded reinforced piston rod and a piston rod with high welding efficiency, good welding quality and high welding strength.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for manufacturing a high-performance precision welded reinforced piston rod, comprising the following steps: S1, inserting the limit ring seat: inserting the limit ring seat from the small end of the piston rod, while making the flange of the limit ring seat face the loading end;

[0005] S2. Determine the position of the limiting ring seat: Based on the drawing of the piston rod assembly and the welding position and dimensions of the limiting ring seat, determine the position of the limiting ring seat relative to the loading end;

[0006] S3. Determine the location and dimensions of the piston rod groove: Based on the part drawing of the retaining ring seat, determine the location and dimensions of the piston rod groove, and reserve at least the location of the brazing joint, while ensuring that the center of the groove is located at the center of its weldable area;

[0007] S4. Recording the initial set dimensions: Determine the width and depth of the notch, and record them as the initial set dimensions;

[0008] S5. Record the process parameters of the experimental samples: Produce experimental samples based on different notch width and depth dimensions, and perform cross resistance butt welding verification and pull-off force test verification on each experimental sample, while recording all welding process parameters;

[0009] S6. Data analysis: Compare and analyze the loads corresponding to different data to determine the appropriate notch width, notch depth and corresponding welding process parameters;

[0010] S7. Data confirmation: Verify the confirmed data to ensure the reliability of the data;

[0011] S8. Save and modify: After verification, fix the final data and modify the piston rod drawing.

[0012] The present invention is further configured as follows: in step S4, the range of the width of the notch is W1-W2 mm, and the range of the depth of the notch is H1-H2 mm.

[0013] The present invention is further configured as follows: in step S5, the welding process parameters include welding current, heating time, upsetting force and upsetting speed.

[0014] Preferably, the step S5 further includes resistance butt welding and flash butt welding. When the welding method is resistance butt welding, the steps include: S511, cleaning the contact surfaces between the electrode and the workpiece and between the workpieces to remove impurities;

[0015] S512, assembling the parts to be welded relative to each other to form a butt joint, so that the end faces of the parts to be welded are in close contact;

[0016] S513, heating the end surface of the weld joint to a plastic state based on the welding parameters in step S5, then turning off the power and applying an upsetting force based on the upsetting parameters in step S5 to complete the welding;

[0017] When the welding method is flash butt welding, the following steps are included: S521, assembling the parts to be welded relative to each other to form a butt joint, and simultaneously turning on a power supply so that the parts to be welded gradually move closer and partially contact each other to form a contact point;

[0018] S522, the welding joint heats the contact based on the welding parameters in step S5 and generates flashes, so that the end surface metal melts;

[0019] S523, the welding joint is powered off and an upsetting force is applied using the upsetting parameters in step S5 to complete the welding.

[0020] Preferably, the step S5 further includes metal burnout amount detection, including the following steps: S531, setting a predetermined burnout allowance L of the workpiece to be welded;

[0021] S532. During the processing, the current burn-off allowance L1 of each workpiece to be welded is detected. If L1 < L, it is determined that the welding does not meet the heating standard and the workpiece continues to be heated. Otherwise, it is determined that the current predetermined burn-off allowance has disappeared, the device is powered off and top forging welding is performed.

[0022] The present application also provides a piston rod manufactured based on the manufacturing method of the above-mentioned high-performance precision welded enhanced piston rod, wherein the piston rod is provided with a ring seat groove and a limiting ring seat arranged on the ring seat groove, and the limiting ring seat has a circular ring end and a flange end.

[0023] By adopting the above technical solution, the beneficial effects are as follows: 1. A specific notch is provided on the piston rod. During the process of resistance butt welding or flash butt welding of the piston rod, the notch can concentrate the welding current, so that the temperature rises quickly, which can improve the heating efficiency of the welding point, reduce the energy and time required for welding, improve the overall welding efficiency, and ensure that the current is evenly distributed during the welding process, further improving the reliability of the welding. At the same time, the welding of the piston rod adopts the process of resistance butt welding or flash butt welding, and has a high welding strength after the welding is completed. In addition, the above process can determine the processing data of the piston rod and the processing parameters of the equipment through multiple groups of experiments, and can optimize the overall process and the processed product to determine the optimal processing process.

[0024] 2. Furthermore, in the process of welding the piston rod, it is necessary to further set the processing parameters, including the size of the welding current, the heating time of the welding head, the upsetting force and the upsetting speed. Specifically, the resistance butt welding and the flash butt welding both generate a large current and a high temperature by turning on the power so that the end face of the workpiece to be processed melts into a plastic state, and applies an upsetting force to complete the welding. Generally speaking, during the welding process, it is necessary to control the amount of metal burned to ensure the quality of the weld joint. At the same time, the upsetting force and the upsetting speed make the contact between the metals closer, further improving the quality of the welding. In addition, the width W of the limit groove can be adjusted as needed, and The adjustment range of W, that is, the range of W1-W2 is 4mm-6mm, which can limit the direction of plastic deformation of the limit ring seat in the radial direction during the processing, and ensure that the limit ring seat can have regular plastic deformation in the groove, that is, the convex points are pre-processed before processing, so that the welding current is more concentrated, the accuracy and strength of the welding point are enhanced, the deviation of the molten core during spot welding is prevented, and the uniformity and stability of the welding point are improved. At the same time, by providing an adjustable limit ring seat groove depth H, further, the adjustment range of H, that is, the range of H1-H2 is 0.3mm-0.8mm, which can promote the formation of fusion during the processing process to adapt to different production needs.

[0025] 3. At the same time, the welding adopts resistance butt welding or flash butt welding. The resistance butt welding can provide higher welding strength. Since the piston rod usually needs to withstand large loads and stresses during use, and the minimum load borne by the limit ring seat is 30KN, the weld must be free of cracks, fractures and strains. In addition, in order to further improve the accuracy of piston rod welding and the connection strength after welding, a flash butt welding method is adopted. Flash is generated by a large current during the welding process, so that there is no need to clean the electrode and the workpiece before processing. At the same time, the flash butt welding has a good welding effect and can be used for welding dissimilar metals. Furthermore, during the resistance welding of the piston rod, since the piston rod has a ring seat groove, and the ring seat groove has a depth H set based on the welding parameters, during the welding of the piston rod, the weld nugget is accurately generated in the ring seat groove of the piston rod, thereby improving the controllability of the welding process. At the same time, during the processing, the processing parameters can be adjusted as needed, and the welding process can be accurately controlled to meet different production needs.

[0026] 4. In addition, during the processing of the piston rod, by setting different notch width dimensions, notch depth dimensions and processing parameters, experimental samples are produced based on different dimensions and process parameters, and after load detection and analysis of each experimental sample, optimized data can be obtained, so that the piston rod requires less time and consumes less energy during the processing, thereby improving the overall welding effect, and optimizing the piston rod drawings to facilitate subsequent processing. The combined processing technology of piston rod grooving and limit ring seat resistance welding reduces the welding heat affected zone, improves the heating efficiency of the welding point, can reduce the energy and time required for welding, improves the overall welding efficiency, reduces the occurrence of welding defects, and improves the quality and reliability of the welded joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A manufacturing method of a high-performance precision welded reinforced piston rod and a piston rod processing flow chart of an embodiment of the present invention;

[0028] Figure 2 A manufacturing method of a high-performance precision welded reinforced piston rod and a process flow chart of resistance butt welding of a piston rod embodiment of the present invention;

[0029] Figure 3 A method for manufacturing a high-performance precision welded reinforced piston rod and a flash butt welding process flow chart of a piston rod embodiment of the present invention;

[0030] Figure 4A method for manufacturing a high-performance precision welded reinforced piston rod and a flow chart for detecting the amount of metal burnt in an embodiment of the piston rod according to the present invention;

[0031] Figure 5 A diagram showing the structure of a piston rod according to a method for manufacturing a high-performance, precision welded reinforced piston rod and an embodiment of the piston rod of the present invention;

[0032] Reference numerals in the figure: 1, piston rod; 2, ring seat groove; 3, limiting ring seat; 31, circular ring end; 32, flange end. DETAILED DESCRIPTION

[0033] Reference Figures 1 to 5 The present invention further describes a method for manufacturing a high-performance precision welded reinforced piston rod and an embodiment of the piston rod.

[0034] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0035] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0036] A method for manufacturing a high-performance precision welded reinforced piston rod comprises the following steps: S1, inserting a limit ring seat 3: inserting the limit ring seat 3 from the small end of the piston rod 1, while making the flange of the limit ring seat 3 face the loading end;

[0037] S2. Determine the position of the limiting ring seat 3: Based on the drawing of the piston rod 1 assembly and the welding position and dimensions of the limiting ring seat 3, determine the position of the limiting ring seat 3 relative to the loading end;

[0038] S3. Determine the position and dimensions of the groove of the piston rod 1: Based on the part drawing of the retaining ring seat 3, determine the position and dimensions of the groove of the piston rod 1, and reserve at least the position of the brazing joint, while ensuring that the center of the groove is located at the center of its weldable area;

[0039] S4. Recording the initial set dimensions: Determine the width and depth of the notch, and record them as the initial set dimensions;

[0040] S5. Record the process parameters of the experimental samples: Produce experimental samples based on different notch width and depth dimensions, and perform cross resistance butt welding verification and pull-off force test verification on each experimental sample, while recording all welding process parameters;

[0041] S6. Data analysis: Compare and analyze the loads corresponding to different data to determine the appropriate notch width, notch depth and corresponding welding process parameters;

[0042] S7. Data confirmation: Verify the confirmed data to ensure the reliability of the data;

[0043] S8. Save and modify: After verification, fix the final data and modify the piston rod 1 drawing.

[0044] In step S4, the width of the notch is in the range of W1-W2 mm, and the depth of the notch is in the range of H1-H2 mm.

[0045] In step S5, the welding process parameters include welding current, heating time, upsetting force and upsetting speed.

[0046] Preferably, the step S5 further includes resistance butt welding and flash butt welding. When the welding method is resistance butt welding, the steps include: S511, cleaning the contact surfaces between the electrode and the workpiece and between the workpieces to remove impurities;

[0047] S512, assembling the parts to be welded relative to each other to form a butt joint, so that the end faces of the parts to be welded are in close contact;

[0048] S513, heating the end surface of the weld joint to a plastic state based on the welding parameters in step S5, then turning off the power and applying an upsetting force based on the upsetting parameters in step S5 to complete the welding;

[0049] When the welding method is flash butt welding, the following steps are included: S521, assembling the parts to be welded relative to each other to form a butt joint, and simultaneously turning on a power supply so that the parts to be welded gradually move closer and partially contact each other to form a contact point;

[0050] S522, the welding joint heats the contact based on the welding parameters in step S5 and generates flashes, so that the end surface metal melts;

[0051] S523, the welding joint is powered off and an upsetting force is applied using the upsetting parameters in step S5 to complete the welding.

[0052] Preferably, the step S5 further includes metal burnout amount detection, including the following steps: S531, setting a predetermined burnout allowance L of the workpiece to be welded;

[0053] S532. During the processing, the current burn-off allowance L1 of each workpiece to be welded is detected. If L1 < L, it is determined that the welding does not meet the heating standard and the workpiece continues to be heated. Otherwise, it is determined that the current predetermined burn-off allowance has disappeared, the device is powered off and top forging welding is performed.

[0054] The present application also provides a piston rod manufactured based on the manufacturing method of the above-mentioned high-performance precision welded enhanced piston rod, wherein the piston rod 1 is provided with a ring seat groove 2 and a limiting ring seat 3 arranged on the ring seat groove 2, and the limiting ring seat 3 has a circular ring end 31 and a flanging end 32.

[0055] The piston rod 1 is provided with a specific notch. During the process of resistance butt welding or flash butt welding of the piston rod 1, the notch can concentrate the welding current, so that the temperature rises quickly at this location, which can improve the heating efficiency of the welding point, reduce the energy and time required for welding, improve the overall welding efficiency, and ensure that the current is evenly distributed during the welding process, further improving the reliability of the welding. At the same time, the welding of the piston rod 1 adopts the process of resistance butt welding or flash butt welding, and has a high welding strength after the welding is completed. In addition, the above process can determine the processing data of the piston rod 1 and the processing parameters of the equipment through multiple groups of experiments, and can optimize the overall process and the finished product to determine the optimal processing process.

[0056] Furthermore, in the process of welding the piston rod 1, it is necessary to further set the processing parameters, including the size of the welding current, the heating time of the welding head, the upsetting force and the upsetting speed. Specifically, the resistance butt welding and the flash butt welding both generate a large current and a high temperature by turning on the power so that the end face of the workpiece to be processed melts into a plastic state, and applies an upsetting force to complete the welding. Generally speaking, during the welding process, it is necessary to control the amount of metal burned to ensure the quality of the weld joint. At the same time, the upsetting force and the upsetting speed make the contact between the metals closer, further improving the quality of the welding. In addition, the width W of the limit groove can be adjusted as needed, and the The adjustment range of W, that is, the range of W1-W2 is 4mm-6mm, which can limit the direction of plastic deformation of the limit ring seat 3 in the radial direction during the processing, and ensure that the limit ring seat 3 can have regular plastic deformation in the groove, that is, the convex points are pre-processed before processing, so that the welding current is more concentrated, the accuracy and strength of the welding point are enhanced, the deviation of the molten core during spot welding is prevented, and the uniformity and stability of the welding point are improved. At the same time, by providing an adjustable groove depth H of the limit ring seat 3, further, the adjustment range of H, that is, the range of H1-H2 is 0.3mm-0.8mm, which can promote the formation of fusion during the processing process to adapt to different production needs.

[0057] At the same time, the welding adopts resistance butt welding or flash butt welding, and the resistance butt welding can provide higher welding strength. Since the piston rod 1 usually needs to withstand large loads and stresses during use, and the minimum load borne by the limit ring seat 3 is 30KN, the weld must be free of cracks, fractures and strains. In addition, in order to further improve the welding accuracy of the piston rod 1 and the connection strength after welding, a flash butt welding method is adopted. During the welding process, a large current is used to generate flash, so that there is no need to clean the electrode and the workpiece before processing. At the same time, the flash butt welding has a good welding effect and can be used for welding dissimilar metals. Furthermore, during the resistance welding of the piston rod 1, since the piston rod 1 has a ring seat groove 2, and the ring seat groove 2 has a depth H set based on the welding parameters, during the welding of the piston rod 1, the welding nugget is accurately generated in the ring seat groove 2 of the piston rod 1, thereby improving the controllability of the welding process. At the same time, during the processing, the processing parameters can be adjusted as needed, and the welding process can be accurately controlled to adapt to different production needs.

[0058] Moreover, during the processing of the piston rod 1, by setting different notch width dimensions, notch depth dimensions and processing parameters, experimental samples are produced based on different dimensions and process parameters, and after load detection and analysis of each experimental sample, optimized data can be obtained, so that the piston rod 1 requires less time and consumes less energy during the processing, thereby improving the overall welding effect, and optimizing the drawings of the piston rod 1 to facilitate subsequent processing. The combined processing technology of the piston rod 1 grooving and the limit ring seat 3 resistance welding reduces the welding heat affected zone, improves the heating efficiency of the welding point, can reduce the energy and time required for welding, improves the overall welding efficiency, reduces the occurrence of welding defects, and improves the quality and reliability of the welded joint.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a high-performance precision welded reinforced piston rod, characterized in that: The following steps are involved: S1. Inserting the limiting ring seat (3): inserting the limiting ring seat (3) from the small end of the piston rod (1), while making the flange of the limiting ring seat (3) face the loading end; S2. Determine the position of the limit ring seat (3): Based on the drawing of the piston rod (1) assembly and the welding position size of the limit ring seat (3), determine the position of the limit ring seat (3) from the loading end; S3. Determine the position and size of the piston rod (1) groove: Based on the part drawing of the limiting ring seat (3), determine the position and size of the piston rod (1) groove, and at least reserve the position of the brazing joint, while ensuring that the center of the groove is at the center of its weldable area; S4. Recording the initial setting dimensions: determining the width dimension and the depth dimension of the notch, and recording them as the initial setting dimensions; S5. Record the process parameters of the experimental samples: produce experimental samples based on different notch width and depth dimensions, and perform cross resistance welding verification and pull-off force test verification on each experimental sample, while recording all welding process parameters; S6. Data analysis: Compare and analyze the loads corresponding to different data to determine the appropriate notch width, notch depth and corresponding welding process parameters; S7. Data confirmation: Verify the confirmed data to ensure the reliability of the data; S8, save and modify: after verification, fix the final data and modify the piston rod (1) drawing; The step S5 also includes resistance butt welding and flash butt welding. When the welding method is resistance butt welding, the following steps are included: S511, cleaning the contact surfaces between the electrode and the workpiece and between the workpieces to remove impurities; S512, assembling the parts to be welded relative to each other to form a butt joint, so that the end faces of the parts to be welded are in close contact; S513, the end surface of the welded joint is heated to a plastic state based on the welding parameters in step S5, and then the power is turned off and an upsetting force is applied according to the upsetting parameters in step S5 to complete the welding; When the welding method is flash butt welding, the following steps are included: S521, relatively assembling the parts to be welded to form a butt joint, and simultaneously turning on the power supply so that the parts to be welded gradually move closer and partially contact to form a contact point; S522, the welding joint heats the contact point based on the welding parameters in step S5 and generates flashes, so that the end surface metal melts; S523, the welding joint is blocked and the upsetting force is applied according to the upsetting parameters in step S5 to complete the welding.

2. A method for manufacturing a high-performance precision welded reinforced piston rod according to claim 1, characterized in that: In step S4, the width of the notch is in the range of W1-W2 mm, and the depth of the notch is in the range of H1-H2 mm.

3. The method for manufacturing a high-performance precision welded reinforced piston rod according to claim 1, characterized in that: In the step S5, the welding process parameters include welding current, heating time, upsetting force and upsetting speed.

4. A method for manufacturing a high-performance precision welded reinforced piston rod according to claim 1, characterized in that: The step S5 also includes metal burnout amount detection, including the following steps: S531, setting a predetermined burnout amount L of the workpiece to be welded; S532. During the processing, the current burn-off amount L1 of each workpiece to be welded is detected. If L1 < L, it is determined that the welding has not reached the heating standard and the workpiece continues to be heated. Otherwise, it is determined that the current predetermined burn-off amount has disappeared, the device is powered off and top forging welding is performed.

5. A piston rod manufactured by the manufacturing method of a high-performance precision welding enhanced piston rod according to any one of claims 1 to 4, characterized in that: The piston rod (1) is provided with a ring seat groove (2) and a limiting ring seat (3) arranged on the ring seat groove (2), and the limiting ring seat (3) has a circular ring end (31) and a flange end (32).

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