CN1119563A - Homogeneous section metal long billet weight cutting method - Google Patents

Abstract

The present invention relates to a cutting method using the weight to define the cutting length of long metal bar. The parameter values of the metal bar to be cut, such as specific gravity, cutting groove, unit length weight and whole cut length are inputted in a computer, after the metal bar is fed into the operating line, its cross-section is measured and inputted in the computer so as to obtain the unit length wieght of said bar. After having been compared with the inputted values the required cutting length can be obtained, and then the optimum cut length is calculated by using computer to make cutting operation. Said method is applicable to the long metal bars with uniform section in longitudinal direction, such as round steel, oval bar, I-bar and square billet, etc. and the utilization rate can be raised.

Description

Homogeneous section metal long billet weight cutting method

The present invention relates to the method that a kind of Cutting Length of definite metal long billet by weight cuts.

In the production process of the long metalwork of uniform cross-section, the factory that blank is provided carries out the scale cutting, the crop loss that causes like this is unfavorable to blank factory, and for the user such as the aspect, steel tube factory of blank, the length of removing blank limits within the specific limits, also the unit weight to blank has certain requirement, because there is the plus-minus tolerance of cross sectional dimensions in blank itself, when factory provides the plus tolerance blank, low and the user's of the utilization rate of factory crop loss increases, and when the negative common difference blank is provided, may cause the unit weight of blank not meet the demands, cause the reduction of blank recovery rate and user availability.When adopting random chi to shear as length is between 4～10 meters the time, can change the sheared length of a part of blank, absorb blank and extend long variation, enter the ratio that allows the scale scope to improve the steel billet of shearing, to improve recovery rate, for example can be divided into 10 meters * 9+6.5 meters * 2 different like this length for long 103 meters blanks; But this method is not considered the cooperation of cross sectional dimensions and unit weight.

The objective of the invention is to obtain a kind of method of determining the metal long billet Cutting Length by weight, adopt computer to calculate, control, make the charge length that obtains promptly satisfy the user can reduce factory again to the qualification of single weight crop loss.

For achieving the above object, the present invention is achieved in that

A kind of homogeneous section metal long billet weight cutting method, it comprises:

(1) at first in computer, import proportion, cutting gap size and the unit weight that is cut blank,

(2) measurement is cut the cross sectional dimensions of blank end certain-length and imports computer,

(3) computer calculates the average cross-section of blank and is converted into unit weight,

(4) unit weight of blank is compared the length that calculates the need cutting with input value,

(5) reserve the cutting slit,

(6) cutting process is finished in the size value signal controlling cutter sweep action of computer output.

In order better to realize the present invention, in computer, import several different cut lengths during beginning, machine carries out cutting after best cut lengths is calculated as calculated.

Below in conjunction with accompanying drawing in detail the present invention is described in detail.

Accompanying drawing is the process chart of homogeneous section metal long billet weight cutting method of the present invention.

The metal long billet that the present invention obtains is according to the method for weight cutting, especially be adapted to do the product that the user of further machining deformation provides for blank, circular pipe blank of using such as the production steel pipe that provides to the steel tube factory etc., the blank that the rough rolling mill provides has satisfied the tolerance of size and has satisfied the requirement of unit weight tolerance, can be met the product of product length requirement after the steel tube factory is further rolling, all be favourable to both sides so economically. Concrete grammar is:

At first will be cut proportion, the numerical value input computers such as cutting gap size, unit weight and several cut lengths of blank, when blank enters the cutting operation line, start photoeletric measuring system and measure size vertical in the cross section of end certain-length, horizontal direction, calculate the cross-sectional area of blank through A/D conversion input computer, and be converted into the unit weight of blank according to its proportion, according to the constant principle of weight, compare with the unit weight of regulation that to be converted into required cutting be chi length, after machine carries out best cut lengths calculating as calculated, obtain each required segment length after reserving the cutting slit, this length shortens according to the plus-minus tolerance of cross sectional dimensions or lengthens, the single weight of blank is remained unchanged, and the product size that then processes is up to specification. The size value signal that computer sends is controlled cutter sweep through interface, finishes cutting such as devices such as flame cutting, plasma cuttings.

Introduce embodiments of the invention below.

This embodiment is long 30m of cutting, the round steel billet of nominal diameter 175mm, and its cut lengths 4～10m, the margin of tolerance of diameter is 175 _-2.6 ^{+ 4.4}Mm, the margin of tolerance of unit weight is 188.8 _-2% ^{+ 1%}Kg/m, the unit weight such as the table 1 of its diameter correspondence show, as can be seen from Table 1, when diameter is negative common difference 175-2.6, its unit weight is less than the negative common difference 188.8-2% (kg/m) of its weight, too short defective with the steel pipe that this blank processes because of length, therefore need length proper extension with circular pipe blank, its single weight is met the demands; Equally, when blank diameter is plus tolerance 175+4.4mm, its unit weight is greater than plus tolerance 188.8+1% (kg/m), blank factory recovery rate is reduced, can make and shorten certain value on the length, make diameter dimension qualified, underproof this part blank of unit weight is fully used, improve the recovery rate and the utilization rate of blank, guarantee that simultaneously user and producer both sides' interests are unaffected.

Method of the present invention is determined applicable to the Cutting Length of homogeneous section metal long billet along its length, as round steel, ellipse, I-steel, square billet etc.

Table 1

Diameter (mm)	Unit weight (kg/m)
		????175～2.6	????188.8-3％
????175～1.7	????188.8-2％
		????175	????188.8
????175～0.5	????188.8+1％
		????175～4.4	????188.8+5.1％

Claims (2)

1. homogeneous section metal long billet weight cutting method, it is characterized in that: it comprises:

(1) at first in computer, import proportion, cutting gap size and the unit weight that is cut blank,

(2) measurement is cut the cross sectional dimensions of blank end certain-length and imports computer,

(3) computer is calculated the average cross-section of blank and is converted into unit weight,

(4) unit weight of blank is compared the length that calculates the need cutting with input value,

(5) reserve the cutting slit,

(6) the size value signal controlling cutter sweep action cutting process of computer output.

2. method according to claim 1, it is waited to levy and is: import several different cut lengths during beginning in computer, machine carries out cutting after best cut lengths is calculated as calculated.

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