High-quality edge cutting method for improving lamination rate of ultra-thin silicon steel

Abstract

The invention relates to a high-quality edge cutting method for improving the lamination rate of ultra-thin silicon steel, which comprises the following steps of: selecting a shear blade with the hardness of 50-54 HRC when the silicon content of silicon steel is greater than or equal to 2wt% and less than 3wt%; the silicon content of silicon steel is larger than or equal to 3 wt% and smaller than or equal to 4 wt%, and the hardness of a shear blade is selected to be 55-58 HRC; the size difference value DK between the rubber sleeve and the shear blade is 0.4-0.8 mm; the diameter of the trimming shear blade is DS, and the diameter DW of the wide rubber sleeve supported on the trimming shear blade is equal to DS; the diameter Dn of the narrow rubber sleeve supported on the trimming shear blade is equal to DS-DK; the diameter Dm of the trimming shear blade lower support narrow rubber sleeve is equal to DS + DK; the clearance quantity index is adjusted according to 15%-25% of the thickness of the silicon steel strip; the overlapping amount is realized through the bite angle of the strip steel during shearing, and the relational expression is as follows: cos alpha = 1-(h + s) / DS; in the formula, alpha-bite angle; h is the thickness of the silicon steel strip; s is the overlap amount; dS represents the edge cutting shear blade diameter; wherein the overlap amount s = 1 / 2h + the compensation value, and the compensation value is + / -(0.01-0.03) mm. The disc edge shearing equipment is adopted for high-quality edge shearing of the ultra-thin silicon steel strip, and it is ensured that the edge shearing surface quality and the burr height meet the lamination rate requirement.

Description

Technical Field

[0001] The invention belongs to the field of production of ultra-thin silicon steel cold-rolled strips, and in particular relates to a high-quality edge trimming method for improving the lamination rate of ultra-thin silicon steel. Background Art

[0002] With the increasingly fierce competition in the silicon steel product market in recent years, the varieties and specifications of silicon steel products have become diversified, and the requirements for various quality standards of products have been increasing year by year. Among them, the stacking coefficient has a great influence on the electromagnetic parameters of the silicon steel core, and is one of the main parameters that the client focuses on. At present, the ultra-thin silicon steel strip is processed by the trimming process, and the height of the burr defect cannot be controlled at ≤0.01mm, resulting in reduced stacking quality, affecting the electromagnetic parameters such as magnetic resistance, resistance, and loss of the core. The current standard requirements pose a huge challenge to the process technology capabilities of ultra-thin silicon steel strips. This design formulates a special trimming process for ultra-thin silicon steel, including the ratio of disc shear rubber sleeves, gap and overlap data, and further improves the hardness of the shear blade on the original basis, so as to ensure the surface quality of the trimming product while meeting the standard control requirements for burr defects, and further improve the stacking coefficient index. Summary of the invention

[0003] The purpose of the present invention is to provide a high-quality trimming method for improving the lamination rate of ultra-thin silicon steel, and solve the problem that the lamination coefficient of ultra-thin silicon steel products is reduced due to the burr defects on the edge exceeding the standard height requirements, affecting the effective use section of the core and increasing the loss. The disc shearing equipment is used to perform high-quality trimming on ultra-thin silicon steel strips to ensure that the trimming surface quality and burr height meet the lamination rate requirements and improve the lamination rate.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-quality trimming method for improving the lamination rate of extremely thin silicon steel sheets, comprising:

[0006] 1) Select the shear blade hardness according to the silicon content of silicon steel. The selection standard is: 2% ≤ silicon steel silicon content <3%, select the shear blade hardness to be 50-54HRC; 3% ≤ silicon steel silicon content ≤4%, select the shear blade hardness to be 55-58HRC.

[0007] In principle, as the silicon steel content increases, the shear blade hardness needs to be appropriately increased. The relationship between the silicon steel content and its hardness and the shear blade hardness configuration are shown in Table 1.

[0008] Table 1 Silicon steel content and shear blade hardness configuration

[0009] w(Si) / % Base material hardness HV Cutting edge hardness HRC 2-3 150-160 50-54 3-4 185-195 55-58

[0010] According to the technical solution of the present invention, the hardness value of the disc shear blade used for cutting the edge of extremely thin silicon steel strip is selected for the silicon content of high-grade silicon steel products. Before implementation, the Rockwell hardness test method can be used, that is, by measuring the amount of protrusions of different sizes pressed into the surface of the tool, to evaluate whether the hardness of the end face of the disc shear meets the use requirements.

[0011] 2) Rubber sleeve ratio index: Compared with the disc shearing edge of the ultra-thin silicon steel strip, the special process is that the difference between the rubber sleeve and the shear blade size D K = 0.4~0.8mm; if it is too large, the edge rubber sleeve will be dented and the burr height will exceed the quality standard; if it is too small, the surface will have obvious visual scratches and burrs. The cutting edge diameter is D S , then the diameter of the wide rubber sleeve on the cutting edge is D W =D S ; Diameter of narrow rubber sleeve on cutting edge support D n =D S -D K ; Diameter of narrow rubber sleeve under the trimming shear blade D m =D S +D K .

[0012] 3) Gap index: Considering the high hardness index of silicon steel and the extremely thin thickness of the strip, the gap is generally adjusted to 15% to 25% of the thickness of the silicon steel strip. Through this special process, the height of the burr defect can be greatly reduced.

[0013] 4) Overlap index: The overlap mainly affects the magnitude of the shear force, which is achieved through the bite angle of the strip during shearing. The relationship is as follows:

[0014] cosα=1-(h+s) / D S

[0015] Where: α-bite angle, unit rad; h-silicon steel strip thickness, unit mm; s-overlap amount, unit mm; D S - Diameter of the trimming shear blade, in mm;

[0016] Overlap The compensation value is ±(0.01~0.03)mm, which can achieve burr height control in line with standard requirements.

[0017] After assembly, the end runout value of each cutter disc is required to be ≤0.03mm, and the radial runout value of the cutter disc is required to be ≤0.05mm.

[0018] According to the selection of shear blade size, three types of rubber sleeve sizes used for cutting the edge of ultra-thin silicon steel strips are selected. After assembly, the end runout value of each cutter disc is required to be ≤0.03mm, and the radial runout value of the cutter disc is less than or equal to 0.05mm. In order to meet the above requirements, the machining accuracy of key parts such as the cutter shaft, cutter disc, cutter disc locking nut, etc. reaches 0.005mm. During the implementation process, the end face runout and radial runout of the disc shear blade should be strictly controlled within the accuracy guarantee value, otherwise the end face runout is too large to cause chipping, and bright spots will appear when the edge of the steel strip is sheared after chipping; radial runout is too large to cause tool overlap error, thus producing large burrs.

[0019] Precise measuring tools must be used to accurately confirm the specifications and dimensions of silicon steel strips, and automatically adjust the parameters of the spare blades off-line. The shear blades can be quickly and accurately adjusted to the overlap and gap values ​​required by the technical solution standards through electronic control equipment, and the gap and overlap parameters of the disc shears can be adjusted at any time during operation.

[0020] The silicon steel strip has a thickness of ≤0.15 mm.

[0021] The maximum average trimming speed of the silicon steel strip is 150 m / min.

[0022] The burr of the cut edge of the sheared silicon steel strip is ≤0.01mm

[0023] The silicon steel strip is trimmed using a disc trimming device.

[0024] The lamination rate of the silicon steel strip after edge trimming is 97% to 98%.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention is aimed at ultra-thin silicon steel strips with a thickness of ≤0.15mm. The cutting stability is greatly improved, the amount of cutting burrs is controlled to ≤0.01mm, and the cutting surface quality meets user needs.

[0027] 2. The lamination rate of silicon steel is further improved and the iron loss is further reduced. The lamination rate of the silicon steel strip after trimming is increased from 93% to 94% in the past to 97% to 98% at present.

[0028] 3. The method of the present invention can ensure that the average trimming speed of ultra-thin non-oriented silicon steel is ≥100m / min, and the maximum average speed can reach 150m / min, thereby ensuring the trimming quality and improving production efficiency.

[0029] 4. Through reasonable parameter settings, the blade bounce is greatly reduced, the service life is delayed by more than double, and the cost is further reduced. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention are further described below in conjunction with the embodiments.

[0031] Embodiment 1:

[0032] A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel, wherein the thickness h of the silicon steel strip in the embodiment is 0.2 mm; the specific method comprises:

[0033] 1) Select the shear blade hardness according to the silicon content of silicon steel. The silicon content of silicon steel in the embodiment is 2.8%, and the shear blade hardness is selected to be 52HRC;

[0034] 2) Rubber sleeve ratio index: the difference between the rubber sleeve and the shear blade size D K =0.8mm; the cutting blade diameter is D S =250mm, then the diameter of the wide rubber sleeve on the cutting edge is D W =D S ; Diameter of narrow rubber sleeve on cutting edge support D n =D S -D K =240.2mm; Diameter of narrow rubber sleeve under the trimming shear blade D m =D S +D K =250.8mm.

[0035] 3) Gap index: Take 20% of the thickness of the silicon steel strip and adjust the value.

[0036] 4) Overlap index: The overlap mainly affects the magnitude of the shear force, which is achieved through the bite angle of the strip during shearing. The relationship is as follows:

[0037] cosα=1-(h+s) / D S

[0038] Where: α-bite angle, unit rad; h-silicon steel strip thickness, unit mm; s-overlap amount, unit mm; D S - Diameter of the trimming shear blade, in mm;

[0039] Overlap The compensation value is 0.02mm.

[0040] After assembly, the end runout value of each cutter disc is 0.02mm, and the radial runout value of the cutter disc is 0.01mm.

[0041] The average speed of silicon steel strip cutting is 150m / min.

[0042] According to the burr height measurement requirements of the standard "YBT492 Electrical Steel Strip Geometric Properties Test Method", the thickness of the sheared edge of the sample and 10mm away from the sheared edge is measured with a measuring tool with an accuracy of 0.002mm. The burr height is the difference between the two thicknesses. The amount of burr on the sheared edge is controlled to ≤0.01mm, and the surface quality of the sheared edge meets the needs of users. The lamination rate of the silicon steel strip after shearing is 98%.

[0043] Embodiment 2:

[0044] A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel, wherein the thickness h of the silicon steel strip in the embodiment is 0.15 mm; the specific method comprises:

[0045] 1) Select the shear blade hardness according to the silicon content of the silicon steel. The silicon content of the silicon steel in the embodiment is 3.0%, and the shear blade hardness is selected to be 55HRC;

[0046] 2) Rubber sleeve ratio index: the difference between the rubber sleeve and the shear blade size D K =0.6mm; the cutting blade diameter is D S =250mm, then the diameter of the wide rubber sleeve on the cutting edge is D W =D S ; Diameter of narrow rubber sleeve on cutting edge support D n =D S -D K =249.4mm; Diameter of narrow rubber sleeve under the trimming shear blade D m =D S +D K =250.6mm.

[0047] 3) Gap index: Take 20% of the thickness of the silicon steel strip and adjust the value.

[0048] 4) Overlap index: The overlap mainly affects the magnitude of the shear force, which is achieved through the bite angle of the strip during shearing. The relationship is as follows:

[0049] cosα=1-(h+s) / D S

[0050] Where: α-bite angle, unit rad; h-silicon steel strip thickness, unit mm; s-overlap amount, unit mm; D S - Diameter of trimming shear blade, in mm.

[0051] Overlap The compensation value is 0.02mm.

[0052] After assembly, the end runout value of each cutter disc is 0.02mm, and the radial runout value of the cutter disc is 0.01mm.

[0053] The average speed of silicon steel strip cutting is 120m / min.

[0054] According to the burr height measurement requirements of the standard "YBT492 Test Method for Geometric Properties of Electrical Steel Strip", the thickness of the sheared edge of the sample and 10mm away from the sheared edge is measured with a measuring tool with an accuracy of 0.002mm. The burr height is the difference between the two thicknesses. The amount of sheared burr is controlled at ≤0.012mm, and the surface quality of the sheared edge meets the needs of users. The lamination rate of the silicon steel strip after shearing is 97%.

[0055] Embodiment 3:

[0056] A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel, wherein the thickness h of the silicon steel strip in the embodiment is 0.15 mm; the specific method comprises:

[0057] 1) Select the shear blade hardness according to the silicon content of silicon steel. The silicon content of silicon steel in the embodiment is 2.8%, and the shear blade hardness is selected to be 52HRC;

[0058] 2) Rubber sleeve ratio index: the difference between the rubber sleeve and the shear blade size D K =0.4mm; the cutting blade diameter is D S =250mm, then the diameter of the wide rubber sleeve on the cutting edge is D W =D S ; Diameter of narrow rubber sleeve on cutting edge support D n =D S -D K =249.6mm; Diameter of narrow rubber sleeve under the trimming shear blade D m =D S +D K =245.4mm.

[0059] 3) Gap index: Take 25% of the thickness of the silicon steel strip and adjust the value.

[0060] 4) Overlap index: The overlap mainly affects the magnitude of the shear force, which is achieved through the bite angle of the strip during shearing. The relationship is as follows:

[0061] cosα=1-(h+s) / D S

[0062] Where: α-bite angle, unit rad; h-silicon steel strip thickness, unit mm; s-overlap amount, unit mm; D S - Diameter of trimming shear blade, in mm; overlap The compensation value is 0.02mm.

[0063] After assembly, the end runout value of each cutter disc is 0.02mm, and the radial runout value of the cutter disc is 0.01mm.

[0064] The average speed of silicon steel strip cutting is 140m / min.

[0065] According to the burr height measurement requirements of the standard "YBT492 Electrical Steel Strip Geometric Properties Test Method", the thickness of the sheared edge of the sample and 10mm away from the sheared edge is measured with a measuring tool with an accuracy of 0.002mm. The burr height is the difference between the two thicknesses. The amount of burr on the sheared edge is controlled to ≤0.01mm, and the surface quality of the sheared edge meets the needs of users. The lamination rate of the silicon steel strip after shearing is 98%.

Claims

1. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel sheets. It is characterized in that include: 1) Select the shear blade hardness according to the silicon content of silicon steel. The selection standard is: 2wt%≤silicon content of silicon steel<3wt%, and the shear blade hardness is selected to be 50~54HRC; 3wt%≤Silicon content of silicon steel≤4wt%, select the shear blade hardness of 55~58HRC; 2) Rubber sleeve ratio index: the difference between the rubber sleeve and the shear blade size D K =0.4~0.8mm; the cutting blade diameter is D S , then the diameter of the wide rubber sleeve on the cutting edge is D W =D S ; Diameter of narrow rubber sleeve on cutting edge support D n =D S -D K ; Diameter of narrow rubber sleeve under the trimming shear blade D m =D S +D K ; 3) Gap index: 15% to 25% of the thickness of the silicon steel strip is used for adjustment; 4) Overlap index: The overlap is achieved by the bite angle of the strip during shearing, and the relationship is as follows: cosα=1-(h+s) / D S Where: α-bite angle, unit rad; h-silicon steel strip thickness, unit mm; s-overlap amount, unit mm; D S - Diameter of the trimming shear blade, in mm; The overlap The compensation value is ±(0.01~0.03)mm.

2. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to claim 1, It is characterized in that After assembly, the end runout value of each cutter disc is required to be ≤0.03mm, and the radial runout value of the cutter disc is required to be ≤0.05mm.

3. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to claim 1, It is characterized in that The silicon steel strip has a thickness of ≤0.15 mm.

4. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to claim 1, It is characterized in that The maximum average speed of the silicon steel strip cutting is 150 m / min.

5. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to claim 1, It is characterized in that The burr on the cut edge of the sheared silicon steel strip is ≤0.01mm.

6. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to claim 1, It is characterized in that The silicon steel strip is trimmed using a disc trimming device.

7. A high-quality trimming method for improving the lamination rate of ultra-thin silicon steel according to any one of claims 1 to 6, It is characterized in that The lamination rate of the silicon steel strip after edge trimming is 97% to 98%.

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