Surfacing welding process method for arc-shaped wear-resistant reinforcing ribs on landing surface of track shoe

Abstract

According to the surfacing process method for the arc-shaped wear-resistant reinforcing rib on the landing surface of the track shoe, the surfacing process method is implemented on the bottom surface of the track shoe, a layer of wear-resistant alloy is surfaced on the bottom surface of the track shoe body made of the 42CrMo material, and the surfacing wear-resistant alloy layer is of a continuous arc-shaped structure, has the function of the reinforcing rib and can improve the overall strength of the track shoe body; the hardness of the alloy layer reaches more than HRC60, and the alloy layer can bear collision and friction of a harsh road surface in the driving process, so that the wear resistance of the bottom of the plate body under the harsh road surface is greatly improved, and the safety and reliability of a special vehicle action system can be effectively guaranteed. The welding material used in the invention is a wear-resistant welding wire, and the surfacing process method is safe, reliable, economical and applicable, is convenient for industrial operation, and can be popularized and applied in parts in the same field.

Description

Technical Field

[0001] The invention belongs to the technical field of welding key parts for crawler-type special vehicles, and in particular relates to a method for surfacing arc-shaped wear-resistant reinforcing ribs on the ground of a crawler plate. Background Art

[0002] Track shoes are important components of the crawler special vehicle's motion system and play an important role in the overall mobility of the special vehicle. During the movement of the crawler special vehicle, the bottom of the track bears the weight of the vehicle body and rubs against the complex road surface. The bottom contact area is prone to wear, which reduces the stability of the vehicle's driving.

[0003] The bottom surface of the earliest manufactured crawler plate did not take wear-resistant protection measures. The ground surface was severely worn after use. The entire plate body had to be replaced during the intervals between vehicle driving to ensure the track's passing performance. The cost of disassembly and replacement was high. After that, the bottom of the crawler plate made of 42CrMo medium carbon steel was subjected to medium-frequency induction quenching. The martensitic structure was generated on the surface of the ground surface to obtain a hardened layer, thereby resisting friction. Although the local induction quenching method can increase the hardness of the ground surface, the interface between the matrix and the hardened layer generates tissue stress, and the over-hardened layer will fall off, causing the track to become unstable. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The invention provides a surfacing welding process for arc-shaped wear-resistant reinforcing ribs on the contact surface of a track shoe, so as to solve the technical problem of how to enhance the overall structural strength of the track shoe body and the wear resistance of the contacting part.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention proposes a method for surfacing arc-shaped wear-resistant reinforcement ribs on the ground surface of a track shoe, and the method for surfacing arc-shaped wear-resistant reinforcement ribs on the ground surface of a track shoe comprises the following steps:

[0008] S1. Preparatory treatment before surfacing: machining an arc-shaped groove on the ground of the track shoe, preparing to perform surfacing welding of a wear-resistant alloy layer in the arc-shaped groove;

[0009] S2. Overlay welding: By using the gas shielded welding method, a wear-resistant alloy layer is formed in the arc-shaped tank body by overlay welding;

[0010] S3. Perform stress relief treatment after surfacing to eliminate track plate welding stress;

[0011] S4. Trim and grind the weld overlay layer to form smooth and continuous reinforcement ribs.

[0012] Furthermore, in step S1, the reinforcement ribs to be welded need to connect the pin holes at the edge of the track plate and the middle web. According to the distribution and structure of the reinforcement ribs, arc-shaped reinforcement ribs are marked on the track plate contact surface as the welding position; according to the marking marks of the welding position, groove milling is performed on the track plate contact surface.

[0013] Furthermore, in step S1, the groove body is arc-shaped, the groove width is 10 mm, and the depth is 3 mm; the groove body processing surface is required to be smooth and flat, without oxide scale and burrs.

[0014] Furthermore, in step S2, the welding wire is wear-resistant welding wire D60 with a specification of φ1.0 mm. Before welding, the welding wire is placed in an insulation barrel for drying at a drying temperature of 60 to 80° C. and a heat preservation time of at least 1 hour.

[0015] Furthermore, in step S2, before surfacing welding is performed in the tank body, the track shoe body is preheated at a temperature of 250-300°C.

[0016] Furthermore, in step S2, the surfacing parameters are: welding current 200-240A, welding voltage 26-30V, welding speed 0.5-0.65m / min, and argon-carbon dioxide mixed gas is used for protection during welding, and the ratio of argon to carbon dioxide gas is 90:10.

[0017] Furthermore, in step S2, surfacing welding is performed in the tank body to fill the tank body, and the surfacing layer is 6 mm.

[0018] Furthermore, in step S3, after the surfacing is completed, the track plate body is immediately placed in a heating furnace for heat preservation to eliminate welding stress.

[0019] Furthermore, in step S3, the process parameters of stress relief treatment after track plate surfacing are: insulation temperature 180-200° C., and insulation time in the furnace more than 4 hours.

[0020] Furthermore, in step S4, after the track plate is surfacing and stress-relief treated, the surfacing reinforcement ribs are polished to make the arc-shaped reinforcement ribs flat and smooth, and the surfacing layer is subjected to a flaw detection inspection.

[0021] (III) Beneficial effects

[0022] The present invention proposes a method for surfacing arc-shaped wear-resistant reinforcement ribs on the ground of the track plate. By implementing the surfacing method on the bottom surface of the track plate, a layer of wear-resistant alloy is surfacing on the bottom surface of the 42CrMo material track plate body. The surfacing wear-resistant alloy layer is in a continuous arc structure, has the function of reinforcement ribs, and can improve the overall strength of the plate body; the hardness of the alloy layer reaches HRC60 or above, and can withstand the bumps and frictions on harsh roads during driving, greatly improve the wear resistance of the bottom of the plate body under harsh roads, and can effectively ensure the safety and reliability of the special vehicle action system. The welding material used in the present invention is wear-resistant welding wire, and the surfacing method is safe and reliable, economical and applicable, and easy to industrialize, and can be promoted and applied in parts in the same field.

[0023] Compared with the conventional track shoe contact surface processing and protection method, the beneficial effects of the present invention specifically include the following aspects:

[0024] 1. Adding continuous reinforcing ribs to the parts of the ground that are prone to friction can improve the track's carrying capacity. The bottom surface of the track shoe is thin, and the connection between the pin holes on the edge and the middle web is weak. By surfacing welding to form a layer of continuous reinforcing ribs, the area of ​​the joint surface and the distributed stress can be increased with less weight, thereby improving the overall strength and rigidity of the component and thus improving the track's carrying capacity.

[0025] 2. By surfacing the wear-resistant alloy layer, the hardness of the ground surface is increased to above HRC60, which significantly improves the wear resistance of the track. The implementation of this process can effectively protect the ground surface of the track plate, and the parts are not easy to wear, thereby ensuring that the track can pass through various complex roads smoothly and reducing the cost of disassembly and replacement of the track plate.

[0026] 3. The process is simple, safe and reliable. Welding is a mature process. The present invention selects appropriate welding materials and welding process parameters to obtain an effective wear-resistant alloy layer. The process is easy to implement and safe, and is suitable for factory batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the surfacing welding process of arc-shaped wear-resistant reinforcement ribs on the ground surface of the crawler plate of the present invention;

[0028] Figure 2 The ground contact pattern of the track plate before surfacing welding of the present invention;

[0029] Figure 3 The surfacing position pattern of the track plate contact surface of the present invention (a groove is made at the arc-shaped trace before surfacing, and wear-resistant welding wire is surfacing in the groove body after surfacing);

[0030] Figure 4 The present invention discloses a stress relief treatment process for a track plate after surfacing welding. DETAILED DESCRIPTION

[0031] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0032] This embodiment provides a method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the ground of the track plate, such as Figure 1 As shown, the process method specifically includes the following steps:

[0033] S1.Preparation before cladding

[0034] S1~1. The track plate ground structure before surfacing welding is as follows Figure 2 As shown in the figure, the reinforcement ribs to be welded need to connect the pin holes at the edge of the track plate and the middle web. According to the distribution and structure of the reinforcement ribs, arc-shaped reinforcement ribs are marked on the track plate contact surface as the welding position. The marking marks at the welding position are shown in the figure below. Figure 3 shown.

[0035] S1~2. According to the marking marks of the surfacing position, the groove is milled on the track plate contact surface. The groove is arc-shaped, with a groove width of 10mm and a depth of 3mm. The groove surface is required to be smooth and flat, without appearance defects such as oxide scale and burrs.

[0036] S2. Surfacing

[0037] S2~1. The welding wire is wear-resistant D60 with a specification of φ1.0mm. Before welding, put the welding wire into a heat preservation barrel for drying at a temperature of 60~80℃. It can be used after being kept warm for 1h.

[0038] S2~2. Preheating the track plate: To prevent excessive stress and welding cracks during track plate welding, the track plate should be preheated in advance at a temperature of 250~300℃.

[0039] S2-3. Set welding parameters: welding current 200-240A, welding voltage 26-30V, welding speed 0.5-0.65m / min, argon-carbon dioxide mixed gas protection during welding, the ratio of argon to carbon dioxide gas is 90:10. Before welding, confirm the surrounding environmental conditions, ambient temperature ≥10℃, ambient humidity ≤60%, no wind environment.

[0040] S2~4. Perform cladding welding in the tank body to fill the tank body and the thickness of the cladding layer reaches 6mm.

[0041] S3. Stress relief

[0042] After surfacing welding of 42CrMo alloy material, there is a large welding stress between the surfacing layer and the substrate. In order to prevent welding cracking, the track plate body is immediately placed in a heating furnace for insulation to eliminate welding stress after surfacing welding. Figure 4As shown, the specific process parameters are: insulation temperature 180 ~ 200 ℃, insulation time in the furnace more than 4h.

[0043] S4. Post-treatment of surfacing

[0044] After the track plate is surfacing and stress-relief treated, the surfacing reinforcement ribs are ground and subjected to NDT inspection.

[0045] S4~1. Grinding: Use an angle grinder to grind and trim the arc-shaped reinforcement ribs with uniform speed, and polish them after grinding to make the arc-shaped reinforcement ribs flat and smooth.

[0046] S4~2. Perform flaw detection: Use a magnetic particle flaw detector to check for cracks, pores and other defects in the cladding layer. If there are no defects, the assembly process can be carried out. If welding defects are found, welding repair is carried out after removing the defective layer, and steps S2 and S3 are repeated. One repair is allowed.

[0047] The present invention can overlay welding to form an arc-shaped wear-resistant alloy layer at the contact surface of the track plate, which serves as a reinforcing rib and plays a role in resisting wear at the contact surface, while ensuring that the main structure of the track plate is not affected by external factors and causes changes in internal organization and mechanical properties.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for surfacing arc-shaped wear-resistant reinforcement ribs on the ground surface of a crawler plate, characterized in that: The track shoe contact surface arc-shaped wear-resistant reinforcement rib surfacing welding process method comprises the following steps: S1. Preparatory treatment before surfacing: machining an arc-shaped groove on the ground of the track shoe, preparing to perform surfacing welding of a wear-resistant alloy layer in the arc-shaped groove; S2. Overlay welding: By using the gas shielded welding method, a wear-resistant alloy layer is formed in the arc-shaped tank body by overlay welding; S3. Perform stress relief treatment after surfacing to eliminate track plate welding stress; S4. Trim and grind the weld overlay layer to form smooth and continuous reinforcement ribs.

2. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the track shoe contact surface according to claim 1, characterized in that: In step S1, the reinforcement ribs to be welded need to connect the pin holes at the edge of the track shoe and the middle web. According to the distribution and structure of the reinforcement ribs, arc-shaped reinforcement ribs are marked on the track shoe contact surface as the welding position; according to the marking marks of the welding position, groove milling is performed on the track shoe contact surface.

3. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the ground surface of a crawler shoe according to claim 2, characterized in that: In step S1, the groove body is arc-shaped, the groove width is 10 mm, and the depth is 3 mm; the groove body processing surface is required to be smooth and flat, without oxide scale and burrs.

4. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the contact surface of a track shoe according to claim 1, characterized in that: In step S2, the welding wire uses wear-resistant welding wire D60 with a specification of φ1.0mm. Before welding, the welding wire is placed in a heat preservation barrel for drying at a drying temperature of 60-80°C and a heat preservation time of at least 1h.

5. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the track shoe contact surface according to claim 1, characterized in that: In step S2, before surfacing welding is performed in the tank body, the track shoe body is preheated at a temperature of 250-300°C.

6. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the track shoe contact surface according to claim 1, characterized in that: In step S2, the surfacing parameters are: welding current 200-240A, welding voltage 26-30V, welding speed 0.5-0.65m / min, and argon-carbon dioxide mixed gas is used for protection during welding, with the ratio of argon to carbon dioxide gas being 90:

10.

7. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the track shoe contact surface according to claim 1, characterized in that: In step S2, surfacing welding is performed in the tank body to fill the tank body, and the surfacing layer is 6 mm.

8. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the contact surface of a track shoe according to claim 1, characterized in that: In step S3, after the surfacing is completed, the track plate body is immediately placed in a heating furnace for heat preservation to eliminate welding stress.

9. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the ground surface of a crawler shoe according to claim 8, characterized in that: In step S3, the process parameters of stress relief treatment after track plate surfacing are: insulation temperature 180-200° C., and insulation time in the furnace for more than 4 hours.

10. The method for surfacing welding of arc-shaped wear-resistant reinforcement ribs on the ground surface of a crawler shoe according to claim 1, characterized in that: In step S4, after the track plate is surfacing and stress-relief treated, the surfacing reinforcement ribs are polished to make the arc-shaped reinforcement ribs flat and smooth, and the surfacing layer is inspected by flaw detection.

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