CN1853821A - Roundness-roller controller of cold-rolling mill - Google Patents

Abstract

A rounding roller controller for cold rolling mill has a proportional overflow valve respectively connected with hydraulic cylinder and oil tank. The control circuit of said proportional overflow valve is connected electrically to a computer connected to a shift detecting unit. Its advantage is high rate of qualified products.

Description

Roundness-roller controller of cold-rolling mill

Technical field:

The present invention relates to a kind of control or conditioning equipment that is specially adapted for rolling mill for metal, particularly a kind of control or conditioning equipment of the thickness sensitivity to material.

Background technology:

Precise cold spreading processing slewing parts, it is the new technology that just developed gradually in nearly two, 30 years, its basic principle is that workpiece is in turning round continuously, under the rotation spreading of rolling wheel and core roller, the blank thickness of workpiece is diminished gradually, the diameter of workpiece is to increase gradually, thereby realizes that revolution class workpiece carries out cold-formed purpose; In above-mentioned process, for keeping workpiece spreading process steady, prolong the life-span of spreading mould, and improve the circularity of shaping workpiece and the percent defective of reduction workpiece, in precision cold rolled machine, be provided with circularity roller and control device thereof; Existing roundness-roller controller includes electromagnetic direction valve, check valve, overflow valve, hydraulic cylinder and linkage, linkage one end is connected with hydraulic cylinder piston rod, the other end is connected with the circularity roller, spreading adds man-hour, electromagnetic direction valve is in meta, the circularity roller is in the full circle state, workpiece adds at rolling wheel and core roller to be depressed, its thickness reduces continuously, diameter constantly increases, and workpiece rotates pushing tow circularity roller and drivening rod around its centre of gyration, and the connecting rod other end will drive hydraulic cylinder piston rod and move, the fluid of piston compression hydraulic cylinder rod chamber, when oil pressure in this chamber surpassed the overflow valve set pressure, the rod chamber inner fluid overflowed from overflow valve, thereby kept the force balance on interior oil pressure of rod chamber and the circularity roller, in the piston in hydraulic cylinder moving process, fluid can be through check valve repairing in the rodless cavity of hydraulic cylinder continuously; Above-mentioned roundness-roller controller can remain in the spreading process, and the circularity roller can pressurize to workpiece, in the hope of reaching the purpose of full circle; But, the thickness of workpiece reduces continuously in the said process, diameter continues to increase, the spreading point of relative rolling wheel of workpiece and core roller is constant, and circularity roller and workpiece by the relative distance between this spreading point in contact, be that increase with diameter of work increases, be the circularity roller to workpiece be that the acting force arm of fulcrum also increases with the increase of diameter of work with the spreading point, at this moment, the circularity roller is to the active force of workpiece constant (because of relief valve set pressure is nonadjustable in process, oil pressure is constant in the rod chamber), and the bending moment of being born on the workpiece also increases with the increase of diameter of work, excessive moment of flexure very easily makes workpiece produce distortion, at thickness of workpiece hour, this phenomenon is more outstanding, thereby makes the full circle poor effect of precise cold spreading processing, the scrappage of goods is higher, reduces economic benefit.

Summary of the invention:

Technical problem to be solved by this invention is, a kind of improved roundness-roller controller of cold-rolling mill is provided, it can be in the spreading process, full circle power is adjusted continuously with the variation of diameter of work and wall thickness realized more rational control, improve the full circle effect, reduce the scrappage of goods, improve precise cold spreading economic benefit of processing.

The technical scheme that the present invention solves the problems of the technologies described above employing is, the hydraulic cylinder of roundness-roller controller of cold-rolling mill is connected with electromagnetic direction valve and check valve, but the piston rod of oscillating motor is articulated in an end of linkage, the other end of linkage is hinged with a circularity roller, be characterized in that roundness-roller controller of cold-rolling mill is provided with a proportional pressure control valve, proportional pressure control valve is connected with hydraulic cylinder, fuel tank by the road respectively, the control loop of proportional pressure control valve is connected with computer, and computer is connected with the displacement detector that touches with the workpiece correspondence.In the process, with the external diameter after the workpiece spreading, thickness or the like change information, by displacement detector input computer, computer goes out relevant voltage value input proportional pressure control valve in conjunction with parameter change calculations such as workpiece, hydraulic cylinders, at this moment, the setting pressure of proportional pressure control valve can realize equating to be the full circle power of target with workpiece bending ductility deformation intensity.

The present invention adopts technique scheme, along with processing work external diameter in the spreading process increases, reduced thickness, its full circle power can reduce accordingly, and realization and the equal corresponding full circle moment of flexure of workpiece flexural deformation intensity, to guarantee the circularity of processing work, fundamentally having overcome traditional roundness-roller controller hydraulic cylinder rod chamber pressure can't adjust, and excessive full circle power may be flattened the defective of workpiece, can improve the quality of processing work significantly and increase economic benefit.

Description of drawings:

Fig. 1 is a roundness-roller controller of cold-rolling mill schematic diagram of the present invention ().

Fig. 2 is a roundness-roller controller of cold-rolling mill schematic diagram of the present invention (two).

Fig. 3 is a schematic flow sheet of the present invention.

The specific embodiment:

Include hydraulic cylinder 1, check valve 2, electromagnetic direction valve 3, proportional pressure control valve 4, computer 5, displacement detector 6, connecting rod circularity roller mechanism 7 with reference to Fig. 1, roundness-roller controller of cold-rolling mill.

It is the executing agency that realizes full circle that hydraulic cylinder 1 includes the hinged point 10 of cylinder body, rodless cavity 11, piston 12 and rod chamber 13, hydraulic cylinder 1, workpiece 83 diameter in the spreading process constantly increases, the circularity roller 72 that moves outward is by piston 12 outer draw of connecting rod 71 with hydraulic cylinder 1, at this moment, hydraulic cylinder 1 can be done corresponding swing around the hinged point 10 of its cylinder body.

Check valve 2 connects the rodless cavity 11 and electromagnetic direction valve 3 oil return openings of hydraulic cylinder 1 respectively, and in processing full circle process, hydraulic cylinder 1 piston 12 outer drawing can be carried out repairing by 2 pairs of rodless cavities of check valve 11.

Electromagnetic direction valve 3 connects the rodless cavity 11 and the rod chamber 13 of hydraulic cylinder 1 respectively, in order to piston 12 shift positions of control hydraulic cylinder 1, initially touches the position with what adjust circularity roller 72 and workpiece.

Proportional pressure control valve 4, its valve body 42 is connected by the rod chamber 13 of pipeline 41 and hydraulic cylinder 1, and another pipeline 44 is connected with fuel tank 9; Proportional pressure control valve 4 is provided with electric control loop, and in order to receiving (voltage) signal from computer 5, the pressure in this signal deciding hydraulic cylinder 1 rod chamber 13 promptly determines the full circle power of circularity roller 72.

Computer 5 can adopt industrial computer or PLC etc., and the output of computer 5 (voltage signal) end is connected in the control loop of proportional pressure control valve 4, and the input of computer 5 is connected in displacement detector 6.

Displacement detector 6 can adopt grating chi, linear potentiometers or similar functions device, and the Device Testing head picks up the variable of processing work diameter in the spreading process, and sends into the input of computer 5 with numeral or analog quantity.

Connecting rod circularity roller mechanism 7 comprises connecting rod 71 and circularity roller 72, its structure and existing structure are same or similar, and connecting rod 71 is V-shaped, and one end and hydraulic cylinder 1 piston rod are hinged, the other end and circularity roller 72 are hinged, and the middle part of connecting rod 71 is articulated in the fixed bearing that is positioned at rolling wheel 81 centers; The circularity roller is one of significant components of precise cold spreading process, and the one side touches rolling wheel 81, and opposite side is to touch workpiece 83 surfaces, is the application point of full circle power with the contact of surface of the work; Increase along with the process diameter of work, the circularity roller will be done relative displacement along rolling wheel 81 and workpiece 83 surfaces, connecting rod circularity roller mechanism 7 each component movement direction are shown in arrow among Fig. 2,2 distances of ab shown in Fig. 2 also constantly increase (a is the spreading point of rolling wheel 81 and 82 pairs of workpiece of core roller, and b is the full circle contact point of circularity roller 72 and workpiece 83) thereupon.

In the spreading process, electromagnetic direction valve is in meta, and the circularity roller is in the full circle state, and along with the diameter increase and the wall thickness reduction of workpiece, full circle power should progressively reduce, in order to avoid workpiece is flattened; The detection head of displacement detector 6 (as signal detection roller 61) is imported computers 5 with workpiece external diameter change information by displacement detector 6, computer 5 with the delta data of above-mentioned displacement in conjunction with known relevant primary data (as the theoretical external diameter of workpiece 83 blanks, workpiece blank 83 theoretical wall thickness, workpiece 83 width, rolling speed to workpiece 83, the external diameter of rolling wheel 81, the effective active area of hydraulic cylinder rod chamber 13, the useful effect arm of force of hydraulic cylinder 1, the plastic deformation intensity of workpiece 83 materials reaches the intensity correction factor relevant with spreading etc.), calculate the determining voltage signal of giving of proportional pressure control valve 4, and with the control loop of this voltage signal input proportional pressure control valve 4, above-mentioned flow process as shown in Figure 3, this moment, the overflow setting pressure of valve 4 of ratio can be tried to achieve from following calculation formula:

The external diameter of any time of workpiece is:

D＝D ₀+(L ₁-L ₀)

Wherein, D ₀Be the theoretical size of workpiece blank, L ₀The reading of displacement detector in the time of will beginning for spreading, L _iReading during for moment i.

Workpiece h is:

h＝h ₀-∫v _Sdt

Wherein: h ₀Be the theoretical wall thickness of workpiece blank, V _SBe the spreading feed speed to workpiece, its value

Given according to roll milling craft by system, ∫ v _SDt is to the accumulative total feeding displacement of i constantly.

The plasticity module of anti-bending section W of workpiece _PFor:

$W_P=\frac{1}{4}B\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A20051002516500101.png"\; state="\{\{state\}\}">h</figure-callout>}}^2$

Wherein: B is the width of workpiece

The full circle moment of flexure at workpiece place:

$M=\frac{D}{D+D_1}p\&CenterDot;A\&CenterDot;L=k\&CenterDot;{\mathrm{\&sigma;}}_p\&CenterDot;W_p$

Wherein: D ₁Be the diameter of rolling wheel 81, P is the setting pressure of proportional pressure control valve, and A is the effective active area of the rod chamber 13 of hydraulic cylinder 4, and L is the useful effect arm of force of hydraulic cylinder, σ _pBe the plastic deformation intensity of workpiece material, $k=f\left(\frac{h_0}{h}\right)$ For with workpiece spreading ratio

Relevant correction factor, it has represented the influence of flow harden phenomenon to plastic deformation intensity, can obtain its numerical value by the test to respective material.

So the setting pressure of proportional pressure control valve is:

$p=\frac{k\&CenterDot;{\mathrm{\&sigma;}}_p\&CenterDot;B\&CenterDot;{(h_0-{\&Integral;v}_3\mathrm{dt})}^2}{4A\&CenterDot;L}[1+\frac{D_1}{D_0+(L_i-L_0)}]$

Flow process in sum, workpiece adds man-hour in spreading, diameter increases continuously, the continuous attenuate of thickness, the circularity roller also extends to the full circle power arm of force of workpiece effect thereupon continuously, technical scheme provided by the invention, and the full circle power that the circularity roller is acted on the workpiece changes and continuous decrement with each above-mentioned continuous parameters, and its value be able to workpiece plastic deformation strength matching, thereby reach splendid full circle effect.

Claims (3)

1, a kind of roundness-roller controller of cold-rolling mill, the hydraulic cylinder of this device is connected with electromagnetic direction valve and check valve, but the piston rod of oscillating motor is articulated in an end of linkage, the other end of linkage is hinged with a circularity roller, it is characterized in that: roundness-roller controller of cold-rolling mill is provided with a proportional pressure control valve (4), proportional pressure control valve (4) is connected with hydraulic cylinder (1), fuel tank (9) by the road respectively, the control loop of proportional pressure control valve (4) is connected with computer (5), the displacement detector (6) that computer (5) is connected with and workpiece (8) correspondence touches.

2, roundness-roller controller of cold-rolling mill according to claim 1 is characterized in that computer (5) is industrial computer or PLC.

3, roundness-roller controller of cold-rolling mill according to claim 1 is characterized in that displacement detector (6) is grating chi or linear potentiometers.

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