A method of processing an elongate rectangular strip

Abstract

The present application belongs to the field of rectangular bar processing, and relates to a processing method of an elongated rectangular bar. The method comprises the following steps: selecting high-quality raw materials, improving material performance through tempering treatment, ensuring straightness through straightening, gradually approaching the final size through fine turning and twice vertical machining (rough machining and semi-fine machining), emphasizing hoisting methods to avoid deformation, increasing qualitative treatment and stress relief aging to stabilize the material, and finally ensuring surface quality and precision through flat grinding and bench work. The process strictly controls each processing step and parameter, effectively reduces deformation and waste rate, and improves processing stability and efficiency. The shape tolerance of the processed elongated rectangular bar is controlled within 0.05 mm, meeting the high-precision requirement. The method is not only suitable for elongated rectangular bars, but also can be popularized to similar part processing, has the advantages of high efficiency, low cost and easy operation, provides a new scheme for the field of high-precision processing, and has wide application and popularization value.

Description

Technical Field

[0001] This invention belongs to the field of rectangular strip processing, and relates to a method for processing slender rectangular strips. Background Technology

[0002] In the fields of mechanical manufacturing and precision machining, slender rectangular bars are a common type of component, widely used in various mechanical equipment and precision instruments. However, due to their long, thin, and small size, slender rectangular bars are prone to deformation during machining, making it difficult to meet design requirements in terms of machining accuracy and geometric tolerances.

[0003] Traditionally, the machining of slender rectangular bars is typically performed using general-purpose methods and equipment, such as lathes and milling machines. However, these methods often struggle to guarantee machining accuracy and dimensional tolerances when machining slender rectangular bars due to factors such as cutting forces, cutting heat, and internal material stresses. Deformation problems are particularly pronounced when the machining allowance is large or the material hardness is high, potentially leading to the scrapping of the part.

[0004] Furthermore, traditional machining methods typically require multiple clamping and positioning operations, which not only increases machining difficulty and cost but may also lead to positioning errors and cumulative errors, further affecting machining accuracy. Therefore, traditional machining methods and equipment have significant limitations and shortcomings for high-precision machining of slender rectangular bars. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a processing method for slender rectangular strips, which releases processing stress and solves the deformation problem by multiple processing and stress relief through aging.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for processing a slender rectangular strip, comprising the following steps:

[0007] S1, Raw material: Select appropriate raw materials according to design requirements to ensure that the material is free of cracks and inclusions, so as to provide a good foundation for subsequent processing;

[0008] S2, Heat treatment: Heat treatment of round materials, including quenching and tempering, to improve the mechanical and machinability of the material, while reducing the tendency of deformation in subsequent processing;

[0009] S3, Straightening: After heat treatment, the material undergoes strict straightening treatment using professional straightening equipment or tools to ensure that the straightness of the material is controlled within 2mm, providing an accurate benchmark for subsequent processing;

[0010] S4, Finish turning: Based on the straightening, finish turning is performed to remove excess material and initially form the outline of the rectangular bar. At the same time, attention should be paid to controlling the cutting force and cutting heat to avoid deformation.

[0011] S5, First vertical machining: After finish turning, the first vertical machining is performed, mainly rough milling of the four sides of the rectangular bar to remove most of the excess material. At the same time, care should be taken to keep the machining allowance uniform and avoid local stress concentration.

[0012] S6, Deburring by fitter: After rough machining, use fitter's tools to remove burrs and flash to ensure surface smoothness and flatness;

[0013] S7, Qualitative treatment: Perform qualitative treatment, such as low-temperature annealing or aging treatment, to stabilize the microstructure and properties of the material and reduce the risk of deformation and cracking in subsequent processing;

[0014] S8, Second vertical machining: After qualitative processing, a second vertical machining is performed, and the four sides of the rectangular bar are semi-finished to further approach the final size and shape. At the same time, care should be taken to control the single-sided milling amount to be below 0.5mm to reduce machining stress and deformation.

[0015] S9, Surface grinding: After semi-finishing, surface grinding is performed. A high-precision surface grinder is used to finish the four sides of the rectangular bar to ensure that the perpendicularity and parallelism of each side are less than 0.05mm. At the same time, any minor deformation or unevenness is checked and corrected.

[0016] S10, Deburring of teeth by fitter: After flat grinding, use fitter's tools again to remove burrs and flash from the teeth or edges to ensure the surface quality of the final product.

[0017] S11, Oxidation treatment: The rectangular bars are oxidized to improve their surface hardness and corrosion resistance, while also increasing their aesthetic appeal;

[0018] S12, Finished Goods Warehouse: After oxidation treatment, the rectangular bars undergo final inspection and measurement to ensure that their size, shape, and performance meet the design requirements before being stored in the finished goods warehouse.

[0019] Optionally, a hoisting method can be used throughout the entire processing to avoid deformation caused by laying flat.

[0020] Optionally, during turnover and processing, specialized lifting tools and equipment are used to ensure that the rectangular bars age naturally under gravity, releasing internal stress.

[0021] Optionally, positioning and inspection should be performed before each vertical machining and surface grinding process to ensure the accuracy and consistency of the machining datum.

[0022] Optionally, during the machining process, the cutting force, cutting heat, and machining deformation should be closely monitored, and machining parameters and process plans should be adjusted in a timely manner to ensure the quality and precision of the final product.

[0023] The beneficial effects of this invention are as follows:

[0024] 1) By precisely controlling the machining allowance, adopting a machining method that combines multiple single-sided milling and flat grinding, and adding qualitative treatment and stress relief aging treatment, this invention effectively solves the problem of easy deformation of slender rectangular bars during machining, so that the geometric tolerances such as straightness, flatness, and perpendicularity can be stably controlled within 0.05mm, meeting the requirements of high-precision machining.

[0025] 2) Due to the adoption of advanced processing technology and strict quality control measures, this invention significantly reduces waste caused by deformation, cracking and other problems, improves material utilization and processing efficiency, and reduces production costs;

[0026] 3) By using a hoisting method to transfer and process slender rectangular bars throughout the entire processing flow, and by adding aging stress relief treatment, the present invention effectively releases processing stress, enhances processing stability, and makes the processing process more reliable and controllable.

[0027] 4) Due to the significant improvement in machining accuracy and geometric tolerances, as well as the reduction in scrap rate, the slender rectangular bars processed by this invention have higher product quality and consistency, meeting the application requirements of high precision and high reliability.

[0028] 5) The processing method proposed in this invention is not only applicable to the processing of slender rectangular bars, but can also be extended to the processing of other parts with similar shapes and sizes, and has wide applicability and promotion value.

[0029] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is a schematic diagram of the solid slender rectangular bar of the present invention;

[0032] Figure 2 for Figure 1 The left view. Detailed Implementation

[0033] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0035] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Please see Figures 1-2 This is a processing method for slender rectangular bars. The target part is a solid slender rectangular bar made of 40Cr material, with dimensions of 14X14 and a length of 850. After slight processing, deformation occurs, making it difficult to achieve perpendicularity of each surface, resulting in poor straightness and curvature of up to 3-4mm after processing, which affects the use of the part.

[0037] In this embodiment, the following steps are adopted:

[0038] S1. Raw material preparation: Select high-quality alloy steel round material with a diameter of Φ30mm and a length of 500mm as raw material to ensure that the material is free from defects such as cracks and inclusions.

[0039] S2, Tempering Treatment: The round material is placed in a heat treatment furnace for tempering treatment, including quenching and tempering, to improve the mechanical and machinability of the material. The quenching temperature is 850℃, the tempering temperature is 200℃, and the holding time is 2 hours for both, followed by air cooling to room temperature.

[0040] S3, Straightening Treatment: Professional straightening equipment is used to straighten the heat-treated material, ensuring its straightness is controlled within 2mm. During the straightening process, multi-point support and gradual pressure application are employed to avoid localized stress concentration.

[0041] S4, Finish turning: After straightening, the round material is finished using a CNC lathe to remove excess material and initially form the outline of a rectangular bar. The cutting parameters are: spindle speed n = 120 r / min, feed rate f = 0.1 mm / rev, depth of cut ap = 1 mm.

[0042] S5, First vertical machining (roughing): The rectangular bar is roughed using a CNC vertical machining center, with milling performed on all four sides to remove most of the excess material. Cutting parameters are: spindle speed n = 200 r / min, feed rate f = 0.2 mm / rev, depth of cut ap = 2 mm. After machining, the allowance on each side is controlled to be approximately 1.5 mm.

[0043] S6, Deburring: Use fitter's tools to remove burrs and flash to ensure surface smoothness and flatness.

[0044] S7, Qualitative Treatment: The rectangular bars are placed in an aging furnace for qualitative treatment at 150℃ for 4 hours, followed by air cooling to room temperature. This stabilizes the material's microstructure and properties, reducing the risk of deformation and cracking during subsequent processing.

[0045] S8, Second Vertical Machining (Semi-Finishing): A second semi-finishing process is performed using a CNC vertical machining center, further milling the four sides to approximate the final dimensions and shape. Cutting parameters are: spindle speed n = 300 r / min, feed rate f = 0.1 mm / rev, depth of cut ap = 0.5 mm. After machining, the allowance on each side is controlled to be approximately 0.3 mm.

[0046] S9, Stress-relief aging treatment: The semi-finished rectangular bar is placed back into the aging furnace for stress-relief aging treatment at 120℃ for 2 hours, and then air-cooled to room temperature. This further releases processing stress and stabilizes dimensions and shape.

[0047] S10, Surface grinding: The four sides of the rectangular bar are precision ground using a high-precision surface grinder to ensure that the perpendicularity and parallelism of each side are less than 0.05mm. The grinding parameters are: grinding speed v = 30m / s, feed rate f = 0.01mm / rev, and depth of grinding ap = 0.05mm.

[0048] S11, Deburring of teeth: Use fitter's tools to remove burrs and flash from teeth or edges to ensure the surface quality of the final product.

[0049] S12, Oxidation Treatment: The rectangular bars are oxidized to improve their surface hardness and corrosion resistance. The oxidation temperature is 500℃, the holding time is 1 hour, and then they are air-cooled to room temperature.

[0050] S13, Final Inspection and Warehousing: The rectangular bars after oxidation treatment are subjected to final inspection and measurement to ensure that their size, shape and performance meet the design requirements before being stored in the finished product warehouse.

[0051] The processing method described in this embodiment successfully yielded high-precision, high-quality slender rectangular bars, with all dimensional and positional tolerances controlled within 0.05 mm, meeting the requirements for high-precision machining. Simultaneously, the scrap rate was significantly reduced during processing, and machining stability and efficiency were improved.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for processing a slender rectangular strip, characterized in that, Includes the following steps: S1, Raw material: Select appropriate raw materials according to design requirements to ensure that the material is free of cracks and inclusions, so as to provide a good foundation for subsequent processing; S2, Heat treatment: Heat treatment of round materials, including quenching and tempering, to improve the mechanical and machinability of the material, while reducing the tendency of deformation in subsequent processing; S3, Straightening: After heat treatment, the material undergoes strict straightening treatment using professional straightening equipment or tools to ensure that the straightness of the material is controlled within 2mm, providing an accurate benchmark for subsequent processing; S4, Finish turning: Based on the straightening, finish turning is performed to remove excess material and initially form the outline of the rectangular bar. At the same time, attention should be paid to controlling the cutting force and cutting heat to avoid deformation. S5, First vertical machining: After finish turning, perform the first vertical machining, rough milling the four sides of the rectangular bar to remove most of the excess material, while ensuring that the machining allowance is uniform and avoiding local stress concentration. S6, Deburring by fitter: After rough machining, use fitter's tools to remove burrs and flash to ensure surface smoothness and flatness; S7, Qualitative treatment: Perform qualitative treatment, such as low-temperature annealing or aging treatment, to stabilize the microstructure and properties of the material and reduce the risk of deformation and cracking in subsequent processing; S8, Second vertical machining: After qualitative processing, a second vertical machining is performed, and the four sides of the rectangular bar are semi-finished to further approach the final size and shape. At the same time, care should be taken to control the single-sided milling amount to be below 0.5mm to reduce machining stress and deformation. S9, Surface grinding: After semi-finishing, surface grinding is performed. A surface grinder is used to finish the four sides of the rectangular bar to ensure that the perpendicularity and parallelism of each side are less than 0.05mm. At the same time, any minor deformation or unevenness is checked and corrected. S10, Deburring of teeth by fitter: After flat grinding, use fitter's tools again to remove burrs and flash from the teeth or edges to ensure the surface quality of the final product. S11, Oxidation treatment: The rectangular bars are oxidized to improve their surface hardness and corrosion resistance, while also increasing their aesthetic appeal; S12, Finished Goods Warehouse: After oxidation treatment, the rectangular bars undergo final inspection and measurement to ensure that their size, shape, and performance meet the design requirements before being stored in the finished goods warehouse.

2. The processing method for a slender rectangular strip according to claim 1, characterized in that: Throughout the entire processing, a hoisting method is used to avoid deformation caused by laying the object flat.

3. The processing method for a slender rectangular strip according to claim 1, characterized in that: During turnover and processing, specialized lifting tools and equipment are used to ensure that the rectangular bars are naturally aged under gravity to release internal stress.

4. The processing method for a slender rectangular strip according to claim 1, characterized in that: Before each vertical machining and flat grinding operation, positioning and inspection must be performed to ensure the accuracy and consistency of the machining datum.

5. The processing method for a slender rectangular strip according to claim 1, characterized in that: During the processing, the cutting force, cutting heat and processing deformation are closely monitored, and the processing parameters and process plan are adjusted in a timely manner to ensure the quality and precision of the final product.

Images