Stamping and re-checking forming process for steel plate of angle steel iron tower

Abstract

The invention relates to the technical field of steel plate punch forming, and discloses an angle steel iron tower steel plate punch rechecking forming process which comprises the following steps: S1, steel plate pretreatment: selecting a hot-rolled steel plate meeting the strength requirement of an angle steel iron tower, performing rust removal and oil removal treatment on the surface of the steel plate, and cutting the steel plate into a blank with a preset size; s2, primary punch forming is carried out, specifically, the pretreated blank is fixed to a lower die base of a punching die, the blank is punched through a punching head of an upper die base, a preliminarily-formed angle steel semi-finished product is formed, and the forming face of the punching head is matched with the profile of the section of angle steel; and S3, primary size detection is conducted, specifically, the flange thickness, the flange width and the included angle of the angle steel semi-finished product are detected through a laser range finder, and qualified semi-finished products with the size deviation within the preset range are screened out. According to the angle steel iron tower steel plate stamping and rechecking forming process, accurate control over the angle steel size precision can be achieved; meanwhile, the mold structure and technological parameters are optimized, and the forming efficiency and the product stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate stamping forming, in particular to a steel plate stamping and re-checking forming process for angle steel towers. BACKGROUND

[0002] As the core support structure of the power transmission line, the size precision and structural strength of the angle steel component of the angle steel tower directly affect the overall stability and service life of the tower. At present, the forming process of the angle steel for the angle steel tower mainly includes hot rolling forming, cold bending forming and single stamping forming,

[0003] In the existing steel plate stamping and re-checking forming process for angle steel towers, the hot rolling forming process has high energy consumption, the size deviation of the formed angle steel is large, the thickness of the flange is uneven, the angle deviation is out of standard, and a large amount of mechanical processing is required for correction, the production efficiency is low, the cold bending forming process is suitable for thin specification angle steel, and the springback phenomenon is easy to occur when forming thick wall angle steel (thickness > 10mm), which leads to difficult control of size precision, the single stamping forming process lacks effective size detection and re-checking correction link, the die wear and blank positioning deviation during stamping process easily lead to unqualified product size, and local defects cannot be corrected, the product qualification rate is low, the die structure of the existing process is fixed, the stamping parameters cannot be dynamically adjusted according to the blank deviation, the adaptability is poor, and it is difficult to meet the forming needs of angle steels of different specifications. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides a steel plate stamping and re-checking forming process for angle steel towers, which can realize accurate control of the size precision of the angle steel, optimize the die structure and process parameters, improve the forming efficiency and product stability, and solve the problems raised in the background art.

[0006] (II) Technical scheme

[0007] To achieve the above purpose, the present application provides the following technical scheme: a steel plate stamping and re-checking forming process for angle steel towers, comprising the following steps:

[0008] S1: steel plate pretreatment, selecting hot-rolled steel plates meeting the strength requirements of the angle steel tower, and cutting the steel plates into blank materials of a preset size after rust and oil removal treatment on the surface of the steel plates;

[0009] S2: primary stamping forming, fixing the pretreated blank material on the lower die seat of the stamping die, stamping the blank material through the stamping head of the upper die seat to form an angle steel semi-finished product, and the forming surface of the stamping head is adapted to the cross-sectional profile of the angle steel;

[0010] S3: Initial dimensional inspection: A laser rangefinder is used to inspect the flange thickness, flange width, and included angle of the angle steel semi-finished product, and qualified semi-finished products with dimensional deviations within the preset range are selected.

[0011] S4: Re-check stamping adjustment, reposition the qualified semi-finished product to the re-check mold, and according to the initial size inspection results, perform local stamping correction on the unqualified area through the adjustable stamping block of the re-check mold. The stamping pressure of the adjustable stamping block can be dynamically adjusted according to the deviation value.

[0012] S5: Secondary dimensional verification: A 3D scanner is used to perform a full-dimensional scan of the corrected angle steel semi-finished product to confirm that all dimensional parameters meet the installation requirements of the angle steel tower.

[0013] S6: Post-forming treatment: The angle steel that has passed the second verification is deburred and chamfered, and then a surface anti-rust coating is sprayed to obtain the finished steel plate of the angle steel tower.

[0014] Preferably, in step S1, the hot-rolled steel plate is made of Q355B or Q420B.

[0015] Preferably, in step S2, the lower die base of the stamping die is provided with a positioning pin, and the blank is positioned and fixed to the lower die base by the positioning pin. Cooling water is used to cool the die and the blank during the stamping process.

[0016] Preferably, in step S4, the verification mold includes a fixed base, an adjustable stamping block, and a drive assembly. The adjustable stamping block is slidably connected to the fixed base via a slide rail, and the drive assembly is driven by a hydraulic cylinder.

[0017] Preferably, in step S5, the scanning accuracy of the 3D scanner is not less than 0.02mm. The scanned data is compared with the preset angle steel standard model. If the comparison is qualified, the process proceeds to the next step. If the comparison is unqualified, the process returns to step S4 for re-verification and stamping adjustment.

[0018] Preferably, in step S6, the deburring process is carried out by grinding with a grinding wheel or plasma cutting, and the anti-rust coating is carried out by hot-dip galvanizing or fluorocarbon paint.

[0019] Preferably, in step S2, a guide post is provided between the upper die holder and the lower die holder of the stamping die, and the forming surface of the stamping head is provided with a wear-resistant coating, wherein the wear-resistant coating is a titanium nitride or tungsten carbide coating.

[0020] Preferably, in step S4, the adjustable stamping block of the verification mold is equipped with a pressure sensor. The pressure sensor provides real-time feedback of stamping pressure data. The output pressure of the drive component is adjusted by the control system to achieve dynamic closed-loop control of the stamping pressure.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, the present invention provides a stamping and forming process for angle steel tower plates, which has the following beneficial effects:

[0023] 1. The stamping and verification forming process of the angle steel tower plate, by combining laser detection and three-dimensional scanning verification after stamping, forms a closed loop for dimensional accuracy control, which effectively solves the problem of large dimensional deviation in traditional processes.

[0024] 2. The stamping verification forming process of the angle steel tower steel plate, through the cooperation of the adjustable stamping block of the verification mold and the dynamic pressure control system, can adjust the stamping pressure and stamping area according to the deviation value of the initial inspection, so as to achieve precise correction of local defects without the need for overall rework.

[0025] 3. The stamping and forming process of the angle steel tower plate uses guide columns and wear-resistant coatings in the stamping die, and positioning pins to achieve precise positioning of the blank. Cooling water is used to prevent thermal deformation. Multiple structural optimizations improve process stability, reduce die wear rate, and extend die service life. Attached Figure Description

[0026] Figure 1 This is a flow chart of a stamping and forming process for angle steel tower plates proposed in this invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 A stamping and forming process for angle iron tower steel plates includes the following steps:

[0029] S1: Steel plate pretreatment: Select hot-rolled steel plates that meet the strength requirements of angle steel towers, remove rust and oil from the steel plate surface, and cut them into blanks of preset size;

[0030] S2: One-time stamping forming, the pre-treated blank is fixed on the lower die base of the stamping die, and the blank is stamped by the stamping head of the upper die base to form a preliminary-shaped angle steel semi-finished product. The forming surface of the stamping head is adapted to the cross-sectional contour of the angle steel.

[0031] S3: Initial dimensional inspection: A laser rangefinder is used to inspect the flange thickness, flange width, and included angle of the angle steel semi-finished product, and qualified semi-finished products with dimensional deviations within the preset range are selected.

[0032] S4: Re-check stamping adjustment, reposition the qualified semi-finished product to the re-check mold, and according to the initial size inspection results, perform local stamping correction on the unqualified area through the adjustable stamping block of the re-check mold. The stamping pressure of the adjustable stamping block can be dynamically adjusted according to the deviation value.

[0033] S5: Secondary dimensional verification: A 3D scanner is used to perform a full-dimensional scan of the corrected angle steel semi-finished product to confirm that all dimensional parameters meet the installation requirements of the angle steel tower.

[0034] S6: Post-forming treatment: The angle steel that has passed the second verification is deburred and chamfered, and then a surface anti-rust coating is sprayed to obtain the finished steel plate of the angle steel tower.

[0035] 2. The stamping and verification forming process of angle steel tower steel plate according to claim 1, characterized in that, in step S1, the material of the hot-rolled steel plate is Q355B or Q420B.

[0036] In step S2, the lower die base of the stamping die is provided with a positioning pin, and the blank is positioned and fixed to the lower die base by the positioning pin. Cooling water is used to cool the die and the blank during the stamping process.

[0037] In step S4, the verification mold includes a fixed base, an adjustable stamping block, and a drive assembly. The adjustable stamping block is slidably connected to the fixed base via a slide rail, and the drive assembly is driven by a hydraulic cylinder.

[0038] In step S5, the scanning accuracy of the 3D scanner is not less than 0.02mm. The scanned data is compared with the preset angle steel standard model. If the comparison is qualified, it proceeds to the next process. If it is not qualified, it returns to step S4 to re-check and re-adjust the stamping.

[0039] In step S6, the deburring process is carried out by grinding with a grinding wheel or plasma cutting, and the anti-rust coating is carried out by hot-dip galvanizing or fluorocarbon paint.

[0040] In step S2, a guide post is provided between the upper and lower die bases of the stamping die, and a wear-resistant coating is provided on the forming surface of the stamping head. The wear-resistant coating is a titanium nitride or tungsten carbide coating.

[0041] In step S4, the adjustable stamping block of the verification mold is equipped with a pressure sensor. The pressure sensor provides real-time feedback of stamping pressure data. The output pressure of the drive component is adjusted by the control system to achieve dynamic closed-loop control of the stamping pressure.

[0042] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel plate stamping and re-forming process for angle steel towers, characterized in that, The method comprises the following steps: S1: steel plate pretreatment, selecting hot-rolled steel plates meeting the strength requirements of the angle steel tower, carrying out rust removal and oil removal treatment on the surface of the steel plates, and cutting the steel plates into blanks of preset sizes; S2: one-time stamping forming, fixing the pretreated blanks on the lower die seat of a stamping die, stamping the blanks through the stamping head of the upper die seat to form angle steel semi-finished products, and the forming surface of the stamping head is matched with the cross-sectional profile of the angle steel; S3: primary size detection, detecting the flange thickness, flange width and included angle of the angle steel semi-finished products by using a laser range finder, and screening qualified semi-finished products with size deviations within a preset range; S4: rechecking stamping adjustment, repositioning the qualified semi-finished products to a rechecking die, locally stamping and correcting the unqualified areas through an adjustable stamping block of the rechecking die according to the primary size detection result, and the stamping pressure of the adjustable stamping block can be dynamically adjusted according to the deviation value; S5: secondary size rechecking, carrying out full-size scanning detection on the corrected angle steel semi-finished products by using a three-dimensional scanner, and confirming that all size parameters meet the installation requirements of the angle steel tower; S6: post-forming treatment, carrying out deburring and edge chamfering treatment on the angle steel that passes the secondary rechecking, and then carrying out surface rust-proof coating spraying to obtain finished steel plates of the angle steel tower.

2. The angle steel tower steel plate stamping and forming process according to claim 1, characterized in that, In step S1, the material of the hot-rolled steel plate is Q355B or Q420B.

3. The gusseted steel tower steel plate punch press forming process of claim 1 wherein, In step S2, the lower die seat of the stamping die is provided with a positioning pin, the blank is positioned and fixed with the lower die seat through the positioning pin, and cooling water is used to cool the die and the blank during the stamping process.

4. The gusseted steel tower steel plate punch press forming process of claim 1 wherein, In step S4, the rechecking die comprises a fixed seat, an adjustable stamping block and a driving assembly, the adjustable stamping block is slidably connected with the fixed seat through a sliding rail, and the driving assembly is driven by a hydraulic cylinder.

5. The gusseted steel tower steel plate punch press forming process of claim 1 wherein, In step S5, the scanning accuracy of the three-dimensional scanner is not less than 0.02 mm, the scanning data is compared with a preset angle steel standard model, and after the comparison is qualified, the angle steel enters the subsequent process, and if it is unqualified, it returns to step S4 for rechecking and stamping adjustment.

6. The gusseted steel tower steel plate punch press forming process of claim 1 wherein, In step S6, the deburring treatment adopts a grinding wheel polishing or plasma cutting method, and the rust-proof coating adopts hot-dip galvanizing or fluorocarbon paint.

7. The gusset steel tower steel plate punch press forming process of claim 1 wherein, In step S2, a guide column is arranged between the upper die seat and the lower die seat of the stamping die, and the forming surface of the stamping head is provided with a wear-resistant coating, which is a titanium nitride or tungsten carbide coating.

8. The gusset steel tower steel plate punch press forming process of claim 1 wherein, In step S4, the adjustable stamping block of the rechecking die is provided with a pressure sensor, the pressure sensor feeds back the stamping pressure data in real time, the output pressure of the driving assembly is adjusted through a control system to realize dynamic closed-loop control of the stamping pressure.

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