Processing method of slender rectangular strip

Abstract

The invention belongs to the field of rectangular strip processing, and relates to a processing method of a slender rectangular strip, which comprises the following steps: selecting a high-quality raw material, and carrying out thermal refining to improve the material performance; straightness is ensured through straightening; finish turning and two times of vertical machining (rough machining and semi-finish machining) are adopted to gradually approach the final size; the hoisting mode is particularly emphasized to avoid deformation; qualitative treatment and stress relief aging are added to stabilize the material; and finally, the surface quality and precision are ensured through flat grinding and bench worker treatment. According to the technology, all machining steps and parameters are strictly controlled, deformation and the rejection rate are effectively reduced, and machining stability and efficiency are improved. And the form and location tolerance of the processed slender rectangular rod is controlled within 0.05 mm, so that the high-precision requirement is met. The method is not only suitable for slender rectangular rods, but also can be popularized to machining of similar parts, has the advantages of being efficient, low in cost, easy to operate and the like, provides a new scheme for the high-precision machining field, and has wide application and popularization value.

Description

Technical Field

[0001] The invention belongs to the field of rectangular strip processing and relates to a method for processing a slender rectangular strip. Background Art

[0002] In the field of mechanical manufacturing and precision machining, slender rectangular bars are common parts widely used in various mechanical equipment and precision instruments. However, due to their long, thin and small size, slender rectangular bars are very easy to deform during machining, making it difficult for machining accuracy and geometric tolerances to meet design requirements.

[0003] Traditionally, for the processing of slender rectangular bars, general processing methods and equipment, such as lathes, milling machines, etc., are usually used. However, these methods are often difficult to ensure processing accuracy and geometric tolerances when processing slender rectangular bars due to factors such as cutting force, cutting heat, and internal stress of the material. Especially when the processing allowance is large or the material hardness is high, the deformation problem is particularly prominent and may even cause the parts to be scrapped.

[0004] In addition, traditional processing methods usually require multiple clamping and positioning, which not only increases the difficulty and cost of processing, but also may cause positioning errors and cumulative errors, further affecting the processing accuracy. Therefore, for the high-precision processing of slender rectangular bars, traditional processing methods and equipment have obvious limitations and shortcomings. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method for processing an elongated rectangular strip, which releases processing stress and solves the deformation problem through multiple processing and aging to relieve stress.

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

[0007] S1, round material: select appropriate raw materials according to design requirements to ensure that the materials are free of cracks and inclusion defects, providing a good foundation for subsequent processing;

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

[0009] S3, Straightening: After quenching and tempering, the material is strictly straightened 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, finishing machining: After straightening, finishing machining 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 finishing, the first vertical machining is performed, mainly for rough milling of the four sides of the rectangular bar to remove most of the excess, while paying attention to keeping the machining allowance uniform to avoid local stress concentration;

[0012] S6, bench deburring: After rough machining, use bench tools to remove burrs and flash to ensure surface finish and flatness;

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

[0014] S8, second vertical machining: After qualitative treatment, the second vertical machining is carried out to perform semi-finishing milling on the four sides of the rectangular bar to further approach the final size and shape. At the same time, pay attention to controlling the single-side milling amount below 0.5mm to reduce processing stress and deformation;

[0015] S9, flat grinding: After semi-finishing, flat grinding is performed. The four surfaces of the rectangular bar are finely ground using a high-precision surface grinder to ensure that the verticality and parallelism of each surface are less than 0.05mm. At the same time, any minor deformation or unevenness is checked and corrected;

[0016] S10, Bench tool to remove burrs on teeth: After flat grinding, use bench tool to remove burrs and flash on teeth or edges again to ensure the surface quality of the final product;

[0017] S11, oxidation treatment: oxidation treatment is performed on the rectangular rod to improve its surface hardness and corrosion resistance, while increasing its aesthetics;

[0018] S12, storage in finished product warehouse: After oxidation treatment, the rectangular bars are finally inspected and measured to ensure that their size, shape and performance meet the design requirements before being stored in the finished product warehouse.

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

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

[0021] Optionally, positioning and inspection are required before each vertical machining and flat grinding process to ensure the accuracy and consistency of the machining benchmark.

[0022] Optionally, during the machining process, the cutting force, cutting heat and machining deformation are closely monitored, and the machining parameters and process plans are adjusted in time to ensure the quality and accuracy of the final product.

[0023] The beneficial effects of the present invention are:

[0024] 1) The present invention effectively solves the problem of easy deformation of slender rectangular bars during processing by accurately controlling the processing allowance, adopting a processing method combining multiple single-sided milling and flat grinding, and adding qualitative treatment and stress relief aging treatment, so that the geometric tolerances such as straightness, flatness, and verticality can be stably controlled within 0.05mm, meeting the needs of high-precision processing;

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

[0026] 3) By adopting a hoisting method to rotate and process the slender rectangular bars in the entire processing flow, and adding aging stress relief treatment, the present invention effectively releases the processing stress, enhances the processing stability, and makes the processing process more reliable and controllable;

[0027] 4) Due to the significant improvement in processing accuracy and geometric tolerance, as well as the reduction in scrap rate, the slender rectangular rods processed by the present invention have higher product quality and consistency, meeting the application requirements of high precision and high reliability;

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

[0029] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 It is a schematic diagram of a solid elongated rectangular rod of the present invention;

[0032] Figure 2 for Figure 1 Left view of . DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] See also Figure 1-2 , which is a processing method for slender rectangular strips. The target parts are solid slender rectangular bars, made of 40Cr, with a size of 14X14 and a length of 850. Slightly processed, they will cause deformation, and the verticality of each surface is difficult to achieve, the straightness is not good, and the curvature even reaches 3-4mm after processing, which affects the use of the parts;

[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 the raw material, and ensure that the material has no defects such as cracks and inclusions.

[0039] S2, quenching and tempering treatment: put the round material into the heat treatment furnace for quenching and tempering treatment, including quenching and tempering, to improve the mechanical properties and processing properties of the material. The quenching temperature is 850℃, the tempering temperature is 200℃, the holding time is 2 hours, and then air-cooled to room temperature.

[0040] S3, Straightening: Use professional straightening equipment to straighten the quenched and tempered material to ensure that the straightness of the material is controlled within 2mm. During the straightening process, multi-point support and gradual pressure are used to avoid local stress concentration.

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

[0042] S5, first vertical machining (rough machining): Use a CNC vertical machining center to perform the first rough machining on the rectangular bar, milling the four faces to remove most of the excess. The cutting parameters are: speed n = 200r / min, feed f = 0.2mm / rev, cutting depth ap = 2mm. After machining, the single-sided excess is controlled at about 1.5mm.

[0043] S6, Bench Deburring: Use bench tools to remove burrs and flash to ensure surface finish and flatness.

[0044] S7, qualitative treatment: put the rectangular bar into the aging furnace for qualitative treatment, the temperature is 150℃, the heat preservation time is 4 hours, and then air-cooled to room temperature. To stabilize the organization and performance of the material and reduce the risk of deformation and cracking in subsequent processing.

[0045] S8, Second vertical machining (semi-finishing): Use CNC vertical machining center for the second semi-finishing, further milling the four faces to approach the final size and shape. The cutting parameters are: speed n = 300r / min, feed f = 0.1mm / rev, cutting depth ap = 0.5mm. After machining, the single-sided allowance is controlled at about 0.3mm.

[0046] S9, stress relief aging treatment: put the semi-finished rectangular bar into the aging furnace again for stress relief aging treatment at 120℃ for 2 hours, and then air cool to room temperature to further release the processing stress and stabilize the size and shape.

[0047] S10, flat grinding: Use a high-precision surface grinder to finely grind the four surfaces of the rectangular bar to ensure that the verticality and parallelism of each surface are less than 0.05mm. The grinding parameters are: grinding speed v = 30m / s, feed rate f = 0.01mm / rev, grinding depth ap = 0.05mm.

[0048] S11, Bench tool removal of tooth burrs: Use bench 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 rod is subjected to oxidation treatment to improve its surface hardness and corrosion resistance. The oxidation temperature is 500°C, the heat preservation time is 1 hour, and then air-cooled to room temperature.

[0050] S13, Final inspection and storage: Final inspection and measurement are carried out on the oxidized rectangular bars to ensure that their size, shape and performance meet the design requirements before storage in the finished product warehouse.

[0051] Through the processing method of this embodiment, a high-precision, high-quality slender rectangular bar product is successfully obtained, and each shape and position tolerance is controlled within 0.05mm, meeting the requirements of high-precision processing. At the same time, the scrap rate during the processing is significantly reduced, and the processing stability and efficiency are improved.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for processing an elongated rectangular strip, characterized in that: The following steps are involved: S1, round material: select appropriate raw materials according to design requirements to ensure that the materials are free of cracks and inclusion defects, providing a good foundation for subsequent processing; S2, quenching and tempering: heat treatment of round materials, including quenching and tempering, to improve the mechanical properties and processing properties of the material, while reducing the tendency of deformation in subsequent processing; S3, Straightening: After quenching and tempering, the material is strictly straightened 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, finishing machining: After straightening, finishing machining 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 finishing, the first vertical machining is performed, mainly for rough milling of the four sides of the rectangular bar to remove most of the excess, while paying attention to keeping the machining allowance uniform to avoid local stress concentration; S6, bench deburring: After rough machining, use bench tools to remove burrs and flash to ensure surface finish and flatness; S7, qualitative treatment: qualitative treatment, such as low temperature annealing or aging treatment, is performed to stabilize the structure and properties of the material and reduce the risk of deformation and cracking in subsequent processing; S8, second vertical machining: After qualitative treatment, the second vertical machining is carried out to perform semi-finishing milling on the four sides of the rectangular bar to further approach the final size and shape. At the same time, pay attention to controlling the single-side milling amount below 0.5mm to reduce processing stress and deformation; S9, flat grinding: After semi-finishing, flat grinding is performed. The four surfaces of the rectangular bar are finely ground using a high-precision surface grinder to ensure that the verticality and parallelism of each surface are less than 0.05mm. At the same time, any minor deformation or unevenness is checked and corrected; S10, Bench tool to remove burrs on teeth: After flat grinding, use bench tools again to remove burrs and flash on teeth or edges to ensure the surface quality of the final product; S11, oxidation treatment: oxidation treatment is performed on the rectangular rod to improve its surface hardness and corrosion resistance, while increasing its aesthetics; S12, storage in finished product warehouse: After oxidation treatment, the rectangular bars are finally inspected and measured to ensure that their size, shape and performance meet the design requirements before being stored in the finished product warehouse.

2. A method for processing an elongated rectangular strip according to claim 1, characterized in that: During the entire processing process, the lifting method is adopted to avoid deformation problems caused by laying flat.

3. A method for processing an elongated rectangular strip according to claim 1, characterized in that: During the turnover and processing, special lifting tools and equipment are used to ensure that the rectangular bars are naturally aged under the action of gravity and the internal stress is released.

4. A method for processing an elongated rectangular strip according to claim 1, characterized in that: Before each vertical machining and flat grinding process, positioning and inspection are required to ensure the accuracy and consistency of the machining datum.

5. The method for processing an elongated 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 plans are adjusted in time to ensure the quality and accuracy of the final product.

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