Machining method for manufacturing large flat plate type casting blank based on wide and thick continuous casting blank

Abstract

The invention belongs to the technical field of steel rolling, and particularly provides a machining method for manufacturing a large flat plate type casting blank based on wide and thick continuous casting billets, which comprises the following steps: S1, pretreating the wide and thick continuous casting billets needing to be machined; s2, carrying out medium-thickness plate hot rolling on the pretreated wide and thick continuous casting billet; s3, heat treatment is conducted on the wide and thick continuous casting billet obtained after hot rolling of the medium-thickness plate is completed; s4, drilling holes in the wide and thick continuous casting billet subjected to heat treatment; s5, the wide and thick continuous casting billet obtained after drilling is installed on a cutting machine; s6, the cutting path of the cutting machine is determined; s7, the cutting machine conducts cutting according to the cutting path; and S8, the cut wide and thick continuous casting billets are detected, the wide and thick continuous casting billets which are detected to be unqualified are trimmed to be qualified, and the wide and thick continuous casting billets which are detected to be qualified are machined casting blanks. The problems that in the prior art, a rolling mill housing blank is machined in a casting or medium-thickness plate hot rolling mode, procedures are tedious, machining cost is high, and machining efficiency is low are solved. The machining process is simple, the working efficiency is high, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling, and in particular relates to a processing method for manufacturing a large flat-plate casting blank based on a wide and thick continuous casting blank. Background Art

[0002] A rolling mill is a device that realizes the metal rolling process. The rolling process is currently widely used in industry and is the main way to produce steel. It is mainly used to produce plates, profiles, and pipes. The mill arch (also known as the mill frame) is mainly used to install all the parts required for the mill to work, such as rollers and roller bearings. It is also an important load-bearing part of the mill and needs to withstand thousands of tons of load. This requires the size and weight of the mill arch to be large enough, so the processing difficulty and cost of this part are very high. In the industry, the production of mill arch blanks is mainly achieved by casting or hot rolling of medium and thick plates. Rolling mill arches with complex surface shapes can be easily processed by casting, but it costs a lot of cost to cast molds, and after casting, subsequent processes are required to process risers, and the production efficiency is low. For example, Patent No. CN202111276775.8 uses casting to process the mill frame, which requires the use of casting molds and riser processing processes. However, due to the high processing cost of hot rolling of medium and thick plates, it is generally only used to process the arches of small rolling mills. For example, patent CN201810088809.2 proposes a laser cladding process on a forging blank, which requires heating, pre-forging, final forging, machining, cooling, cleaning and heat treatment of the forging blank, and the process is cumbersome. Summary of the invention

[0003] The present invention provides a processing method for producing large flat-plate casting blanks based on wide and thick continuous casting blanks, aiming to overcome the problems of the prior art of processing rolling mill arch blanks by casting or medium and thick plate hot rolling, which has cumbersome procedures, high processing costs and low processing efficiency.

[0004] To this end, the present invention provides a processing method for manufacturing a large flat-plate casting blank based on a wide and thick continuous casting blank, comprising the following steps:

[0005] S1. Pre-treat the wide and thick continuous casting billet to be processed;

[0006] S2, hot rolling the pre-treated wide and thick continuous casting billet into medium and thick plates;

[0007] S3, heat treating the wide and thick continuous casting billet after hot rolling of medium and thick plates;

[0008] S4, drilling holes on the wide and thick continuous casting billet after heat treatment;

[0009] S5, installing the drilled wide and thick continuous casting billet on a cutting machine;

[0010] S6, determining the cutting path of the cutting machine;

[0011] S7, the cutting machine performs cutting according to the cutting path;

[0012] S8. The wide and thick continuous casting billets that have been cut are inspected, and those that fail the inspection are trimmed to be qualified. The wide and thick continuous casting billets that pass the inspection are the finished casting blanks.

[0013] Preferably, the step S1 comprises the following steps: firstly, heating the wide and thick continuous casting billet to be processed to a target temperature, and then removing the oxide scale on the surface of the wide and thick continuous casting billet after heating.

[0014] Preferably, the target temperature is 1100-1300°C.

[0015] Preferably, the heat treatment in step S3 is normalizing and tempering.

[0016] Preferably, in step S4, holes are drilled on the four corners of the wide and thick continuous casting billet after heat treatment.

[0017] Preferably, the cutting in step S7 is performed by flame cutting.

[0018] Preferably, the cutting process needs to be monitored in real time during the cutting.

[0019] Preferably, after determining the cutting path of the cutting machine, the cutting parameters are set first, and after the cutting parameters are set, the preheating CNC flame cutting machine is started, and cutting begins when the flame can penetrate the wide and thick continuous casting billet.

[0020] Preferably, the cutting parameters include nozzle aperture, cutting speed and gas pressure.

[0021] Preferably, the inspection is a flaw detection inspection of the surface and interior of the wide and thick continuous casting slab after cutting.

[0022] Beneficial effects of the present invention:

[0023] 1. The processing method for manufacturing a large flat-plate casting blank based on a wide and thick continuous casting blank provided by the present invention comprises the following steps: S1, pre-treating the wide and thick continuous casting blank to be processed; S2, hot-rolling the wide and thick continuous casting blank after the pre-treatment into a medium and thick plate; S3, heat-treating the wide and thick continuous casting blank after the medium and thick plate hot rolling; S4, drilling holes in the wide and thick continuous casting blank after the heat treatment; S5, installing the drilled wide and thick continuous casting blank on a cutting machine; S6, determining a cutting path of the cutting machine; S7, the cutting machine cutting according to the cutting path;

[0024] S8, inspecting the wide and thick continuous casting billets that have been cut, trimming the unqualified wide and thick continuous casting billets to qualified ones, and the qualified wide and thick continuous casting billets are the finished casting blanks. The present invention uses wide and thick continuous casting billets instead of cast steel billets to produce rolling mill arch blanks, which provides a new idea for the processing of rolling mill arches, has simple procedures, saves production costs, and improves processing efficiency.

[0025] 2. The processing method for making large flat-plate casting blanks based on wide and thick continuous casting billets provided by the present invention improves the internal structure of the wide and thick continuous casting billets and eliminates internal defects of the wide and thick continuous casting billets by hot rolling the pre-treated wide and thick continuous casting billets into medium and thick plates.

[0026] 3. The processing method for producing large flat-plate casting blanks based on wide and thick continuous casting blanks provided by the present invention eliminates the hot rolling stress of the medium and thick plates by heat treating the wide and thick continuous casting blanks completed by hot rolling of the medium and thick plates, thereby obtaining better comprehensive mechanical properties.

[0027] 4. The processing method for producing large flat-plate casting blanks based on wide and thick continuous casting blanks provided by the present invention uses flame cutting to achieve a neat incision without deformation near the cut. The flame cutting device has light weight, low investment, flexible operation and high processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Figure 1 It is a flow chart of the processing method for producing large flat casting blanks based on wide and thick continuous casting blanks. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0031] Embodiment 1:

[0032] A processing method for manufacturing a large flat-plate casting blank based on a wide and thick continuous casting blank comprises the following steps:

[0033] S1. Pre-treat the wide and thick continuous casting billet to be processed;

[0034] S2, hot rolling the pre-treated wide and thick continuous casting billet into medium and thick plates;

[0035] S3, heat treating the wide and thick continuous casting billet after hot rolling of medium and thick plates;

[0036] S4, drilling holes on the wide and thick continuous casting billet after heat treatment;

[0037] S5, installing the drilled wide and thick continuous casting billet on a cutting machine;

[0038] S6, determining the cutting path of the cutting machine;

[0039] S7, the cutting machine performs cutting according to the cutting path;

[0040] S8. The wide and thick continuous casting billets that have been cut are inspected, and those that fail the inspection are trimmed to be qualified. The wide and thick continuous casting billets that pass the inspection are the finished casting blanks.

[0041] The invention produces the rolling mill arch blank by using wide and thick continuous casting billets instead of cast steel billets, thus providing a new idea for the processing of the rolling mill arch, simplifying the process, saving production costs and improving processing efficiency.

[0042] Embodiment 2:

[0043] Based on Example 1, step S1 includes the following steps: firstly, heating the wide and thick continuous casting billet to be processed to a target temperature, and then removing the oxide scale on the surface of the heated wide and thick continuous casting billet.

[0044] Specifically, by heating the wide and thick continuous casting billet to an appropriate temperature, the subsequent hot rolling of medium and thick plates is facilitated; by removing the oxide scale on the surface of the wide and thick continuous casting billet after heating, the subsequent machining process is smoother, reducing unnecessary processing time and cost.

[0045] Preferably, a high-pressure water jet machine is used to remove the oxide scale on the surface of the wide and thick continuous casting billet after heating.

[0046] Specifically, the use of a high-pressure water jet machine can automatically, efficiently and accurately remove the oxide scale, avoid damage to the wide and thick continuous casting billet body, and reduce material waste. Compared with the operation of chemicals such as pickling, the operation of a high-pressure water jet machine is safer.

[0047] Embodiment 3:

[0048] Based on Example 2, the target temperature is 1100-1300°C.

[0049] Specifically, 1100-1300° C. is beneficial to the subsequent hot rolling of medium and thick plates. Preferably, the target temperature is 1200° C. 1200° C. is more beneficial to the subsequent hot rolling of medium and thick plates.

[0050] Embodiment 4:

[0051] Based on Example 3, the heat treatment in step S3 is normalizing and tempering.

[0052] Specifically, through normalizing and tempering treatments, the mechanical properties of the wide and thick continuous casting billet can be optimized, which helps to refine the grain structure of the wide and thick continuous casting billet, making the material more uniform and dense, and can effectively eliminate the internal stress generated by the wide and thick continuous casting billet during the casting process, reducing the risk of deformation and cracking.

[0053] Embodiment 5:

[0054] On the basis of Example 4, the step S4 is to drill holes on the four corners of the wide and thick continuous casting billet after heat treatment.

[0055] Specifically, four corners of the wide and thick continuous casting billet after hot rolling of the medium and thick plate are drilled on a drilling machine to improve the subsequent cutting efficiency.

[0056] Preferably, the installation is to install the wide and thick continuous casting billet after drilling on the workbench of the cutting machine and position and clamp it with a clamp to ensure the cutting accuracy and prevent the workpiece from moving during the processing.

[0057] Specifically, determine the cutting path of the cutting machine and write the movement trajectory of the nozzle during cutting according to the size of the drawing. You can also import the edited CAD drawing into the cutting machine to generate the cutting trajectory.

[0058] Embodiment 6:

[0059] Based on Example 5, the cutting in step S7 is performed by flame cutting.

[0060] Specifically, through flame cutting, the incision is relatively neat, and no deformation occurs near the cutting seam. The flame cutting device is light in weight, requires little investment, is flexible in operation, and has high processing efficiency.

[0061] Embodiment 7:

[0062] Based on Example 5, the cutting process needs to be monitored in real time during the cutting.

[0063] Specifically, by monitoring the cutting process in real time during cutting, it is convenient to adjust the cutting in time according to the actual cutting situation and improve the cutting accuracy.

[0064] Embodiment 8:

[0065] On the basis of Example 7, after the cutting path of the cutting machine is determined, the cutting parameters are set first, and after the cutting parameters are set, the preheating CNC flame cutting machine tool is started, and cutting begins when the flame can penetrate the wide and thick continuous casting billet.

[0066] Specifically, cutting begins after the flame is able to penetrate the wide and thick continuous casting billet, so that the flame cutting can quickly penetrate the wide and thick continuous casting billet, realizing an efficient cutting process, which helps to improve production efficiency and reduce processing time.

[0067] Preferably, the cutting parameters include nozzle aperture, cutting speed and gas pressure.

[0068] Specifically, by adjusting the aperture of the nozzle, the cutting speed and the pressure of the gas, it is convenient to obtain the desired flame, and the operation is convenient.

[0069] Preferably, when the thickness of the wide and thick continuous casting billet is 150 mm, the nozzle aperture is 2.4 mm, the cutting speed is 120-160 mm / min, the oxygen pressure is 0.5-0.8 Mpa, and the acetylene pressure is >0.5 Mpa. The flame cutting efficiency is high.

[0070] Embodiment 9:

[0071] On the basis of Example 8, the detection is a flaw detection on the surface and interior of the wide and thick continuous casting slab that has been cut.

[0072] Specifically, the surface of the wide and thick continuous casting billet after cutting is inspected for defects, and the interior of the wide and thick continuous casting billet after cutting is inspected for cracks, shrinkage holes, segregation and other problems, so as to find problems in time and make fine repairs to ensure the cutting quality.

[0073] Preferably, the trimming is to grind the burrs appearing at the trimming and to repair the problems found by flaw detection. After the repair is completed, the blank of the rolling mill arch is sent to subsequent processing.

[0074] Preferably, the repair is welding.

[0075] Specifically, welding repair can reduce errors and damage during the repair process, improve the quality of repair, simplify the operation, and improve production efficiency.

[0076] In the description of the present invention, it should be understood that if any term indicates an orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention.

[0077] The above embodiments are merely examples of the present invention and do not limit the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A processing method for producing large flat-plate casting blanks based on wide and thick continuous casting blanks, characterized in that: The steps include: S1. Pre-treat the wide and thick continuous casting billet to be processed; S2, hot rolling the pre-treated wide and thick continuous casting billet into medium and thick plates; S3, heat treating the wide and thick continuous casting billet after hot rolling of medium and thick plates; S4, drilling holes on the wide and thick continuous casting billet after heat treatment; S5, installing the drilled wide and thick continuous casting billet on a cutting machine; S6, determining the cutting path of the cutting machine; S7, the cutting machine performs cutting according to the cutting path; S8. The wide and thick continuous casting billets that have been cut are inspected, and those that fail the inspection are trimmed to pass. The wide and thick continuous casting billets that pass the inspection are the finished casting blanks.

2. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 1, characterized in that: The step S1 comprises the following steps: firstly, heating the wide and thick continuous casting billet to be processed to a target temperature, and then removing the oxide scale on the surface of the heated wide and thick continuous casting billet.

3. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 2, characterized in that: The target temperature is 1100-1300°C.

4. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 1, characterized in that: The heat treatment in step S3 is normalizing and tempering.

5. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 1, characterized in that: The step S4 is to drill holes on the four corners of the wide and thick continuous casting billet after heat treatment.

6. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 1, characterized in that: The cutting in step S7 is performed by flame cutting.

7. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 6, characterized in that: During the cutting, the cutting process needs to be monitored in real time.

8. The processing method for producing a large flat plate casting blank based on a wide and thick continuous casting blank as claimed in claim 6, characterized in that: After the cutting path of the cutting machine is determined, the cutting parameters are set first. After the cutting parameters are set, the preheating CNC flame cutting machine tool is started, and cutting begins when the flame can penetrate the wide and thick continuous casting billet.

9. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 8, characterized in that: The cutting parameters include the aperture of the nozzle, the cutting speed and the pressure of the gas.

10. The processing method for producing a large flat-plate casting blank based on a wide and thick continuous casting blank as claimed in claim 1, characterized in that: The inspection is a flaw detection inspection of the surface and interior of the wide and thick continuous casting slab after cutting.

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