Convex pushing cutter for steel rail welding machine

Abstract

The utility model discloses a convex pushing cutter for a steel rail welding machine, which solves the problem of short service life of the existing convex pushing cutter. The push protruding cutter is a movable welding push protruding cutter body composed of a cutter body chain-shaped structure and a locking mechanism, the cutter body chain-shaped structure is composed of a left cutter, a top cutter and a right cutter which are sequentially hinged into a whole, and the left cutter, the top cutter and the right cutter are provided with cutting edges matched with the section shape of a steel rail. The cutting edge is a non-magnetic cobalt-based alloy surfacing body fixed on the cutter body, the high point of the cobalt-based alloy surfacing body is at least 3mm higher than the plane of the cutter body, and the distance between the high point of the cobalt-based alloy surfacing body and the surface of the steel rail is not less than 1mm. The wear-resistant surfacing body is additionally arranged at the blade position, so that the service performance and the service life of the bulged cutter body are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the field of rail profile control for rail flash welding, in particular to a convex-pushing tool based on surfacing welding of a Co-based high-temperature material with excellent high-temperature service performance. Background Art

[0002] As an important component of the rail flash welding machine, the embossing cutter body is an important tool for removing the protruding part of the rail welding. It can effectively reduce the processing allowance of manual grinding after welding and improve production efficiency. At present, there are two main usage scenarios for rail flash welding, namely, fixed flash welding machine and mobile flash welding machine. Regardless of the type of welding machine, in the embossing stage in the later stage of welding, due to the poor wear resistance of the embossing cutter body, it will cause excessive embossing allowance or damage the rail. In order to effectively improve the quality of the weld profile of fixed flash welding and mobile flash welding, and obtain a weld shape that matches the profile size of the parent material well, as an effective solution strategy, the embossing cutter is used in the embossing of the weld after rail welding.

[0003] Research has found that in the actual operation process, the embossing cutter is in a high temperature environment (about 1000 ℃), which is easy to cause coarse grains, component segregation, thermal stress and thermal fatigue during repeated heating and cooling. At the same time, the embossing cutter surrounds the secondary circuit of the welding machine. Due to the large current in the secondary circuit, it is easy to cause eddy current phenomenon, resulting in "self-heating" inside the embossing cutter body causing the temperature to rise. Under the dual effect, its service life is further shortened and the cutting quality is deteriorated. According to statistics, the fixed flash welding embossing cutter body needs to be replaced after an average of 600 to 700 embossing heads and the mobile flash welding embossing cutter body needs to be replaced after an average of 200 to 300 embossing heads. It has become one of the most easily damaged parts of the rail flash welding machine, increasing the maintenance cost. In addition, multiple maintenance operations in a short period of time have increased the labor intensity of employees to a certain extent and reduced the labor value of employees.

[0004] Therefore, it is urgent to study a embossing tool with high temperature stability, red hardness and thermal fatigue resistance. Summary of the invention

[0005] Based on the above problems, the utility model provides a convex-pushing tool for a rail welding machine, which solves the problem of low service life of the existing convex-pushing tool.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A embossing tool for a rail welding machine, the embossing tool is a movable welding embossing tool body composed of a tool body chain structure, wherein the tool body chain structure is composed of a left tool, a top tool, and a right tool that are hinged together in sequence, and the left tool, the top tool, and the right tool have a cutting edge that matches the cross-sectional shape of the rail, characterized in that the cutting edge is a non-magnetic cobalt-based alloy cladding body fixed on the tool body, and the high point of the cobalt-based alloy cladding body is at least 3 mm higher than the tool body plane, and the high point of the cobalt-based alloy cladding body is not less than 1 mm from the surface of the rail.

[0008] Furthermore, the surfacing body is located on one side of the cutter body.

[0009] Furthermore, the surfacing body is located at a center plane position of the cutter body.

[0010] Furthermore, the hardness of the blade cladding material reaches Rockwell hardness 48-57HRC.

[0011] Furthermore, the tensile strength of the blade body is greater than 485 MPa, and the operating temperature of the blade body is greater than 800°C stainless steel material.

[0012] Furthermore, a pair of weld nodule top breaking protrusions are provided on the right cutter body, and the two weld nodule top breaking protrusions are located on the corresponding cutter bodies on both sides of the lower flange of the rail, and the weld nodule top breaking protrusions are square frustum structures, and the dimensions of the weld nodule top breaking protrusions are: the top surface is a 6*6 mm square, the bottom surface is a 8*8 mm square, and the height is 7 mm.

[0013] A embossing tool for a rail welding machine, the embossing tool is a fixed welding embossing tool body composed of a left tool, a top tool, a right tool and a bottom tool, wherein the left tool, the top tool, the right tool and the bottom tool have cutting edges that match the cross-sectional shape of the rail, and are characterized in that the cutting edges are non-magnetic cobalt-based alloy cladding bodies fixed on the tool body, and the high point of the cobalt-based alloy cladding body is at least 3 mm higher than the plane of the tool body, and the high point of the cobalt-based alloy cladding body is not less than 1 mm from the surface of the rail.

[0014] Furthermore, the surfacing body is located on one side of the cutter body.

[0015] Furthermore, the surfacing body is located at a center plane position of the cutter body.

[0016] Furthermore, the hardness of the blade surfacing material reaches Rockwell hardness 50-59 HRC.

[0017] The beneficial effects of the utility model are:

[0018] The utility model forms a cobalt-based alloy surfacing body at the position of the blade, so that the service performance and service life of the convex cutter body are significantly improved.

[0019] The new cutter body has excellent high temperature stability and better cutting ability than the old cutter body. During the cutting process, the cutter body can keep the original design model size as much as possible, so that the rail profile after cutting is more in line with the quality requirements and better meets the original design intention.

[0020] The new cutter body not only improves the service performance but also greatly reduces its manufacturing cost. It also greatly improves its economic value while meeting the requirements of safe, stable and reliable use and relevant technical standards, and has a high promotion value.

[0021] The developed embossing cutter body adopts the surface surfacing modification treatment of cobalt-based alloy. Thanks to the high high temperature stability, wear resistance, corrosion resistance and non-magnetic properties of cobalt-based alloy, the surface of the embossing cutter body after treatment inherits the performance advantages of the surfacing material, and its high temperature performance and wear resistance and corrosion resistance are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the utility model.

[0023] Figure 2 for Figure 1 main view.

[0024] Figure 3 for Figure 1 Bottom view of .

[0025] Figure 4 for Figure 1 Side view of.

[0026] Figure 5 It is a three-dimensional view of the right knife body.

[0027] Figure 6 It is a three-dimensional view of the right knife body.

[0028] Figure 7 It is a three-dimensional diagram of the top cutter body.

[0029] Figure 8 It is a three-dimensional diagram of the top cutter body.

[0030] Fig. 9 It is a three-dimensional view of the left blade body.

[0031] Fig.10 It is a three-dimensional view of the left blade body.

[0032] Fig.11 This is the welding structure diagram of the cladding body and the cutter body.

[0033] Fig.12 This is the welding structure diagram of the cladding body and the cutter body.

[0034] In the figure: 10 left knife, 20 top knife, 30 right knife, 40 steel pin hinge, 00 cobalt-based alloy cladding body, 01 weld nodule top broken protrusion. DETAILED DESCRIPTION

[0035] The main body of the convex pushing tool is a chain-like structure of the tool body. The tool body structure material is composed of a stainless steel substrate (parent material) and a cobalt-based high-temperature alloy material welded on the cutting edge of the tool body. The cobalt-based alloy material is welded on the cutting edge of the tool body to form a cutting edge structure with an outward convex structure, which forms the main part of the tumor pushing operation.

[0036] Preferably, the substrate is non-magnetic 316 stainless steel, which has good performance, wherein the stainless steel blade has a tensile strength greater than 485 MPa and a blade operating temperature greater than 800°C.

[0037] Further, as a movable welding push convex cutter body, the cutter body chain structure is composed of a left cutter 10, a top cutter 20, and a right cutter 30 which are hinged together in sequence. Figures 1 to 11 The structure shown in FIG. 1 is a structure in which the left and right cutter bodies are mounted on both sides of the top cutter through a steel pin hinge 40 and are enclosed on the rail. Figures 7 and 8 The blade structure on the top cutter is that the cutting edge is a non-magnetic cobalt-based alloy cladding body 00 and the height H between the high point of the cladding body and the plane of the cutter body is at least 3 mm, and the cutting edge is greater than 1 mm from the surface of the rail to meet the needs of pushing away the rail weld nodules.

[0038] Preferably, the cobalt-based alloy cladding body 00 has a height of 13 mm and a width of 12 mm, and the lower part is embedded and integrated with the blade body. Fig.11 and Fig.12 .

[0039] Furthermore, the cobalt-based alloy cladding body 00 is composed of multiple layers of welding wear-resistant layers, wherein two adjacent layers of welding wear-resistant layers are stacked in a forward or vertical manner.

[0040] Furthermore, a pair of weld nodule breaking protrusions 01 are also provided on the right cutter body. The two weld nodule breaking protrusions are located on both sides of the lower flange corresponding to the rail and are square frustum structures. Specifically, the size of the weld nodule breaking protrusion is: the top surface is a 6*6 mm square, the bottom surface is a 8*8 mm square, and the protrusion height is controlled at 7 mm. Its function is to break the weld nodule cut on the rail during the nodule pushing process, so that the annular weld nodule ring is broken into three sections. Specifically, the weld nodule breaking protrusions on both sides form a certain height and hardness of the nodule breaking protrusions, which squeeze the weld nodule, increase its plastic deformation, and realize the breaking effect of the weld nodule (annular). And the weld nodule breaking protrusion 01 is also a cobalt-based alloy material, which has higher hardness and high temperature resistance, meeting the needs of the operation.

[0041] Further, as a fixed welded convex tool body, the convex tool is composed of a left tool, a top tool, a right tool, and a bottom tool (not shown in the figure).

[0042] Preferably, the above-mentioned surfacing welding uses a cobalt-based alloy electrode with high-temperature stability, red hardness and thermal fatigue resistance. For example, D822 cobalt-based alloy surfacing electrode is used. D822 has good welding performance, and its high stability, corrosion resistance, impact resistance and wear resistance are good, and the Rockwell hardness is ≥50HRC.

[0043] Preferably, the D822 cobalt-based alloy cladding electrode, wherein the cobalt-based alloy electrode contains 25%-33% chromium, 3%-21% tungsten, and 0.7%-3.0% carbon, is subjected to a cladding welding process to form a non-magnetic blade edge structure, thereby further improving the tolerance of the blade in a high temperature environment.

[0044] Preferably, the surfacing process is performed by argon tungsten arc welding or manual arc welding.

[0045] The welding process is as follows:

[0046] Both arc welding and tungsten inert gas welding can be used for welding, but if arc welding is used, the weld should be tapped frequently with a small hammer during the welding process to reduce the stress caused by the sudden drop in temperature.

[0047] Before welding, the base metal of the cutter body should be heated to 500-600℃, and the electrode should be kept at 180℃ in the oven for one hour. The welding heat input directly affects the hardness and grain size of the weld deposit.

[0048] The surfacing body is located on one side of the cutter body ( Fig.11 ) or centered plane position ( Fig.12 ), formed by surfacing, the cobalt-based alloy surfacing body 00 is a laminated structure composed of multiple layers of surfacing cobalt-based alloy. Since the surfacing of the push-convex cutter groove is relatively high (12-15mm), 4-5 layers of welding are required to fill it. In order to reduce the disappearance of alloy elements caused by overheating, the interlayer temperature is maintained at about 220°C.

[0049] After welding, tempering treatment is required. The entire blade body is heated to 600°C with an oxyacetylene flame, wrapped with asbestos cloth for one hour, and cooled in air when the temperature drops below 300°C.

[0050] Preferably, the surfacing process uses low current welding, and multi-layer and multi-pass welding is used during the welding process, and the interlayer temperature is maintained at about 200°C.

[0051] Preferably, after the surfacing process is completed, the entire structure needs to be tempered.

[0052] Taking into account the secondary circuit current of the embossing tool is very large during operation, it is easy to cause eddy current phenomenon, further causing electromagnetic heating, and the tool body needs to be demagnetized. Starting from the tool body cladding layer material, this project selects non-magnetic Co-based alloy materials. In order to further improve its anti-magnetic and high-temperature stability, Co-based materials with high proportion of alloy elements such as W, Ni, and V are appropriately selected during material selection. Cr and W micro-alloyed Co-based alloy welding rods are used in the specific trial production. The Co-based alloy welding rods contain 25%-33% chromium, 3%-21% tungsten, and 0.7%-3.0% carbon, thereby forming a non-magnetic tool body cutting edge structure, further improving the tool body's tolerance performance in high temperature environments.

[0053] Preferably, the blade edge of the blade body structure is welded and raised to 3 mm above the blade body plane. Fig.11 Indicated by H, it forms a slightly protruding blade feature, and the blade is formed through fine grinding. In view of the dimensional factors such as the profile size characteristics of the rail, machining allowance and form and position tolerance, and it is conducive to fine grinding after embossing, the blade is especially tightly processed and cut. Referring to the maximum deviation of the size of my country's rails of 1mm, according to the rail welding operation instructions, the size of the embossing knife edge is determined to be about 1.5mm from the surface of the rail, and cannot be less than 1mm. The whole process is controlled, the dimensional tolerance is strictly controlled, and random inspections are carried out during the processing process to ensure that the dimensional requirements are met.

[0054] The developed new special anti-wear thrust cutter body should meet the following technical parameters:

[0055] Fixed welding: The hardness of the blade material reaches Rockwell hardness 50-59HRC, the tool body processing accuracy: ±0.1mm, the tool body tensile strength is not less than 485MPa, and the tool body working temperature is not less than 800℃.

[0056] Mobile welding: The hardness of the blade material reaches Rockwell hardness 48-57HRC, the tool body processing accuracy: ±0.1mm, the tool body tensile strength is not less than 485MPa, and the tool body working temperature is not less than 800℃.

[0057] It has the following beneficial effects:

[0058] 1) The increase of surfacing body prolongs the service life of the embossing cutter body, which will reduce the inspection and maintenance frequency, further solve the repair problem, and reduce the labor intensity and time cost of employees. In addition, due to the good cutting ability, the controllability of the processing allowance is improved, which can improve the instability of the later manual grinding workload caused by the deformation of the cutter body.

[0059] 2) The new cutter body has excellent high temperature stability and better cutting ability than the old cutter body. During the cutting process, the cutter body can maintain the original design model size as much as possible, so that the rail profile after cutting is more in line with the quality requirements and better meets the original design intention.

[0060] 3) The new cutter body not only improves the service performance but also greatly reduces its manufacturing cost. It also greatly improves its economic value while meeting the requirements of safe, stable and reliable use and relevant technical standards, and has a high promotion value.

[0061] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in the field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A convex tool for a rail welding machine, the convex tool being a movable welding convex tool body composed of a tool body chain structure, wherein: The chain structure of the knife body is composed of a left knife, a top knife and a right knife which are hinged in sequence, and have a cutting edge matching the cross-sectional shape of the rail on the left knife, the top knife and the right knife. It is characterized in that the cutting edge is a cobalt-based alloy cladding body fixed on the knife body, and the high point of the cobalt-based alloy cladding body is at least 3 mm higher than the plane of the knife body, and the high point of the cobalt-based alloy cladding body is not less than 1 mm away from the surface of the rail.

2. The embossing tool for a rail welding machine according to claim 1, characterized in that: The cobalt-based alloy cladding body is located on one side of the cutter body.

3. The embossing tool for a rail welding machine according to claim 1, characterized in that: The cobalt-based alloy cladding body is located at the center plane position of the cutter body.

4. The embossing tool for a rail welding machine according to claim 1, characterized in that: The tensile strength of the knife body is greater than 485MPa, and the working temperature of the knife body is greater than 800°C.

5. The embossing tool for a rail welding machine according to claim 1, characterized in that: A pair of weld nodule top-breaking protrusions are also provided on the right cutter body. The two weld nodule top-breaking protrusions are located on the corresponding cutter bodies on both sides of the lower flange of the rail. The weld nodule top-breaking protrusions are square frustum structures, and the dimensions of the weld nodule top-breaking protrusions are: the top surface is a 6*6 mm square, the bottom surface is a 8*8 mm square, and the height is 7 mm.

6. A convex tool for a rail welding machine, the convex tool is a fixed welding convex tool body composed of a left tool, a top tool, a right tool and a bottom tool, wherein: The left knife, top knife, right knife and bottom knife have cutting edges that match the cross-sectional shape of the rail, and are characterized in that the cutting edge is a cobalt-based alloy cladding body fixed on the knife body, and the high point of the cobalt-based alloy cladding body is at least 3 mm higher than the plane of the knife body, and the high point of the cobalt-based alloy cladding body is not less than 1 mm away from the surface of the rail.

7. The embossing tool for rail welding machine according to claim 6, characterized in that: The surfacing body is located on one side of the cutter body.

8. The embossing tool for a rail welding machine according to claim 6, characterized in that: The surfacing body is located at the center plane position of the cutter body.

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