A method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel

Abstract

The present invention relates to a verification method, in particular to a method for formula calculation verification in the design of transverse rib spacing of threaded steel, comprising the following steps: S1.1: collecting roller or roller ring data; S1.2: optimizing the collected roller or roller ring data according to the calculation formula; S1.3: optimizing different finished products according to the calculation results. The present invention can be used for calculation verification in the design of transverse rib spacing of threaded steel. The calculation result of the empirical formula is very consistent with the actual finished product rib spacing data, and can be used to verify the rationality of the transverse rib spacing design. The present invention avoids the waste caused by excessive transverse rib spacing or too small transverse rib spacing in the early trial rolling of the newly designed hole type; the use of the empirical formula of the present invention only requires simple calculations, no investment costs, and avoids the generation of waste and loss of manpower and material resources in multiple production tests.

Description

Technical Field

[0001] The invention relates to a verification method, in particular to a method for calculating and verifying a formula in the design of transverse rib spacing of threaded steel bars. Background Art

[0002] Rebar is the common name for hot-rolled ribbed steel bars. The grade of rebar consists of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words hot-rolled, ribbed, and bars. Hot-rolled ribbed steel bars are divided into two grades: HRB400 (the old grades are 20MnSiv, ​​20MnSiNb, and 20Mnti) and HRB500. They are widely used in civil engineering construction such as houses, bridges, and roads. The difference between rebar and plain round steel bars is that the surface of rebar has longitudinal ribs and transverse ribs, usually with two longitudinal ribs and transverse ribs evenly distributed along the length. Rebar is a small-sized steel material, mainly used for the skeleton of reinforced concrete building components. It is required to have certain mechanical strength, bending deformation performance, and process welding performance during use. The raw material billet for producing rebar is carbon structural steel or low-alloy structural steel that has been treated with calm smelting, and the finished steel bar is delivered in hot-rolled, normalized, or hot-rolled state. At present, the mainstream design of transverse rib spacing of rebar in the world is to calculate the theoretical transverse rib spacing of rebar based on the diameter size of the bottom position of the finished hole groove of the rolling roller (or roller ring) (see the specific calculation formula below), and then make subjective corrections based on the designer's own experience, and then continuously optimize in the subsequent production and debugging process to finally obtain a reasonable number of transverse ribs and transverse rib spacing. This will not only cause more waste and defective products in the early production, but also increase the work of repeated verification and correction by designers, consume manpower and material resources, and the entire design process is relatively cumbersome. Summary of the invention

[0003] The purpose of the present invention is to solve the defects mentioned in the above background technology by proposing a method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel bars.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A method for calculating and verifying a formula in the design of transverse rib spacing of threaded steel bars is provided, comprising the following steps:

[0006] S1.1: Collect roll or roll ring data;

[0007] S1.2: Optimize and calculate the collected roll or roll ring data according to the calculation formula;

[0008] S1.3: Optimize different finished products based on the calculation results.

[0009] As a preferred technical solution of the present invention: the finished product optimization in S1.3 includes optimizing the number of transverse ribs for the newly designed finished product hole profile and optimizing the transverse rib spacing for the original hole profile parameters.

[0010] As a preferred technical solution of the present invention: in S1.1, when optimizing the number of transverse ribs of the newly designed finished hole type, the collected data include the outer diameter of the newly designed roller or roller ring, the coefficient corresponding to the roller material, the coefficient corresponding to the presence or absence of tension, and the required finished product rib spacing.

[0011] As a preferred technical solution of the present invention: in S1.1, when optimizing the transverse rib spacing of the original hole parameters, the collected data include the outer diameter of the roller or roller ring, the coefficient corresponding to the roller material, the coefficient corresponding to the presence or absence of tension, and the number of transverse ribs.

[0012] As a preferred technical solution of the present invention: in S1.2, the calculation formula is as follows:

[0013]

[0014] Among them, l is the actual transverse rib spacing of the finished rebar; π is a constant; K is the influence coefficient of the roll material and surface condition; q is the back tension of the finished stand rolling mill; D is the diameter of the roll or roll ring; n is the number of transverse ribs around the roll or roll ring.

[0015] As a preferred technical solution of the present invention: when the rolling roller is made of cast iron roller, K=1.005.

[0016] As a preferred technical solution of the present invention: when the rolling roller is made of carbide roller, K=1.002.

[0017] As a preferred technical solution of the present invention: the diameter of the rolling roller or roller ring is the actual outer diameter, not the groove bottom diameter.

[0018] As a preferred technical solution of the present invention: the q∈[0.990-1.000], the greater the tension after the finished stand rolling mill, the smaller the value of q.

[0019] As a preferred technical solution of the present invention: when the finished product stand rolling mill has no tension, q=1.0.

[0020] Compared with the prior art, the method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel provided by the present invention has the following beneficial effects:

[0021] The present invention can be used for calculation verification when designing the transverse rib spacing of threaded steel. The calculation result of the empirical formula is very close to the actual finished product rib spacing data, and can be used to verify the rationality of the transverse rib spacing design. The present invention avoids the waste caused by excessive transverse rib spacing or too small transverse rib spacing in the early trial rolling of the newly designed hole type; the empirical formula of the present invention only requires simple calculations, no investment costs, and avoids the waste of manpower and material resources caused by multiple production tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a flow chart of a method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this embodiment can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Reference Figure 1 The preferred embodiment of the present invention provides a method for calculating and verifying a formula in the design of transverse rib spacing of threaded steel bars, comprising the following steps:

[0025] S1.1: Collect roll or roll ring data;

[0026] S1.2: Optimize and calculate the collected roll or roll ring data according to the calculation formula;

[0027] S1.3: Optimize different finished products based on the calculation results.

[0028] The finished product optimization in S1.3 includes optimizing the number of transverse ribs for the newly designed finished product hole profile and optimizing the transverse rib spacing for the original hole profile parameters.

[0029] In S1.1, when optimizing the number of transverse ribs for the newly designed finished hole profile, the collected data include the outer diameter of the newly designed roll or roll ring, the coefficient corresponding to the roll material, the coefficient corresponding to the presence or absence of tension, and the required finished rib spacing.

[0030] In S1.1, when optimizing the transverse rib spacing of the original hole parameters, the collected data include the outer diameter of the roll or roll ring, the coefficient corresponding to the roll material, the coefficient corresponding to the presence or absence of tension, and the number of transverse ribs.

[0031] In S1.2, the calculation formula is as follows:

[0032]

[0033] Among them, l is the actual transverse rib spacing of the finished rebar; π is a constant; K is the influence coefficient of the roll material and surface condition; q is the back tension of the finished stand rolling mill; D is the diameter of the roll or roll ring; n is the number of transverse ribs around the roll or roll ring.

[0034] When the rolling roller is made of cast iron roller, K=1.005.

[0035] When the rolling roller is made of carbide roller, K=1.002.

[0036] The roller or roller ring diameter is the actual outer diameter, not the groove bottom diameter.

[0037] The q∈[0.990-1.000], the greater the tension after the finished stand rolling mill, the smaller the value of q.

[0038] When the finished stand rolling mill has no tension, q=1.0.

[0039] In this embodiment, the calculation formula for the number of transverse ribs and the transverse rib spacing in the prior art is as follows:

[0040]

[0041] Among them, l is the theoretical rib spacing of the rebar; D is the outer diameter (actual diameter) of the roller or roller ring; h is the groove depth; n is the number of transverse ribs around the roller or roller ring.

[0042] When the calculation formula of the present invention is used for calculation, for a newly designed finished hole type: when designing the transverse rib spacing of the threaded steel finished hole, firstly, the determined outer diameter of the roller or roller ring (actual diameter), the coefficient K corresponding to the roller material, the coefficient q corresponding to the presence or absence of tension, and the desired finished rib spacing are brought into the formula of the present invention to calculate the optimal number of transverse ribs.

[0043] For the original hole parameters: the outer diameter of the roller or roller ring (actual diameter), the coefficient K corresponding to the roller material, the coefficient q corresponding to the presence or absence of tension, and the number of transverse ribs can be directly brought into this formula to calculate a more realistic transverse rib spacing for the finished product, so as to facilitate further optimization of the number of transverse ribs corresponding to different roller diameters.

[0044] Take the transverse rib spacing of threaded steel with a finished nominal diameter of 10mm as an example.

[0045] The national standard rib spacing is 1.0mm±0.5mm; the grinding amount of tungsten carbide roller ring is calculated as 1.0mm each time; the groove depth design value is 4.0mm; there is a loop in front of the finished product frame, without tension. Refer to Table 1,

[0046] When used once, the roller ring diameter is 247 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.36 mm, the traditional formula calculates the rib spacing of the finished product to be 7.20 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.33 mm.

[0047] When used twice, the roller ring diameter is 246 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.32 mm, the traditional formula calculates the rib spacing of the finished product to be 7.17 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.30 mm.

[0048] When used 3 times, the roller ring diameter is 245 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.28 mm, the traditional formula calculates the rib spacing of the finished product to be 7.14 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.27 mm.

[0049] When used 4 times, the roller ring diameter is 244 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.24 mm, the traditional formula calculates the rib spacing of the finished product to be 7.11 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.24 mm.

[0050] When used 5 times, the roller ring diameter is 243 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.22 mm, the traditional formula calculates the rib spacing of the finished product to be 7.08 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.21 mm.

[0051] When used 6 times, the roller ring diameter is 242 mm, the number of transverse ribs is 106, the actual measured value of the rib spacing of the finished product is 7.18 mm, the traditional formula calculates the rib spacing of the finished product to be 7.05 mm, and the formula of the present invention calculates the rib spacing of the finished product to be 7.18 mm.

[0052] Table 1 Design table of transverse rib spacing of threaded steel with a finished nominal diameter of 10 mm

[0053]

[0054] A comprehensive comparison between the formula of the present invention and the traditional calculation formula shows that the calculation result of the present invention is closer to the actual value.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel, characterized in that: The steps include: S1.1: Collect roll or roll ring data; S1.2: Optimize and calculate the collected roll or roll ring data according to the calculation formula; S1.3: Optimize different finished products based on the calculation results; The optimization of different finished products in S1.3 includes optimizing the number of transverse ribs for the newly designed finished product hole profile and optimizing the transverse rib spacing for the original hole profile parameters; In S1.1, when optimizing the number of transverse ribs for the newly designed finished pass, the collected data include the outer diameter of the newly designed roll or roll ring, the coefficient corresponding to the roll material, the coefficient corresponding to the presence or absence of tension, and the required finished rib spacing; In S1.1, when optimizing the transverse rib spacing of the original hole parameters, the collected data include the outer diameter of the roll or roll ring, the coefficient corresponding to the roll material, the coefficient corresponding to the presence or absence of tension, and the number of transverse ribs; In S1.2, the calculation formula is as follows: Among them, l is the actual transverse rib spacing of the finished rebar; π is a constant; K is the influence coefficient of the roll material and surface condition; q is the back tension of the finished stand rolling mill; D is the diameter of the roll or roll ring; n is the number of transverse ribs around the roll or roll ring.

2. The method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel according to claim 1 is characterized in that: When the rolling roller is made of cast iron roller, K=1.

005.

3. The method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel according to claim 2, characterized in that: When the rolling roller is made of carbide roller, K=1.

002.

4. The method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel according to claim 2, characterized in that: The roller or roller ring diameter is the actual outer diameter, not the groove bottom diameter.

5. The method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel according to claim 2, characterized in that: The q∈[0.990-1.000], the greater the tension after the finished stand rolling mill, the smaller the value of q.

6. The method for calculating and verifying the formula in the design of transverse rib spacing of threaded steel according to claim 1, characterized in that: When the finished stand rolling mill has no tension, q=1.0.

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