CN1227779A - Method for deciding parameters of drum-type flying shears mechanism according to technological requirement - Google Patents

Abstract

A method for determining the structural parameters of drum flying shears according to technological requirement includes such steps as creating a model, that is, the absolute value of the sum of the dynamic changes in the distance of the projected point of upper shearing edge top on the plane of lower shearing edge and the distance of the projected point of lower shearing edge top on the plane of upper shearing edge is smaller than or equal to the maximal allowance of the gap between upper and lower shears for the minimal thickness of plate to be sheared, optimizing calculation with the model, writing shearing models of design variables for 6 parameters to be determined, transforming the shearing models to target models, and based on target models to find out 6 parameters . Its advantages is high effect, resulting in higher sheared plate thickness up to 5.5 mm.

Description

The method of deciding parameters of drum-type flying shears mechanism according to technological requirement

What the present invention relates to is the design of a kind of flying shear mechanism, and especially a kind of method of deciding parameters of drum-type flying shears mechanism according to technological requirement belongs to the cutting field in the operation transportation class.

When determining mechanism design with diagram method, experimental method, analytic method or optimization, traditional connecting rod class flying shear mechanism all designs according to given trace, the technology that directly solves connecting rod class flying shear mechanism according to technological requirement seldom has introduction at home and abroad, in December, 1996 China " iron and steel " the 31st volume, the 12nd phase " are directly found the solution the flying shear mechanism parameter by technological requirement " author Liu Ran, Hu Guanghua introduced the parameter that solves connecting rod class flying shear mechanism and determined.But also do not have for a long time the professional in cylinder class flying shear mechanism under the prerequisite of the appearance and size that does not change equipment, mechanical electronic hydraulic interface size, again by technological requirement directly find the solution, the design organization parameter.Cylinder class and connecting rod class flying shearing machine all have very big difference at machine construction, scissors form, scissors principle, flying shear running orbit, and the shearing thickness of connecting rod class is significantly smaller than rolling class shearing thickness, by update search, do not find as yet so far cylinder class flying shear mechanism to patent and non-patent literature.Employing is target with the technological requirement, is criterion with the difference that allows, any given initial scheme, the method for definite flying shear mechanism parameter in the scope of constraints.

The objective of the invention is to overcome the deficiencies in the prior art and defective, proposed a kind ofly directly to decide six optimum structure parameters in the cylinder class flying shear mechanism design by technological requirement.

Technical scheme of the present invention is: the profile length and width size of all former electric systems, equipment, flying shear steel plate, and the condition of not changing such as whole interface sizes of mechanical electronic hydraulic equipment room, with original shear steel plate thickness from 0.3mm≤δ＜2.0mm, determine to expand to 0.3mm≤δ≤4.5mm, with cylinder class flying shearing machine is example, determine cylinder class flying shear mechanism parameter by these technological requirements, as: lower scissor blade radius of gyration R _D, upper scissor blade radius of gyration R _G, cutter shaft centre-to-centre spacing H _O, cutter shaft eccentric throw E, bottom knife oblique angle θ _C, cutter oblique angle θ _KDetermine that by technological requirement cylinder class flying shear mechanism parametric technique is after having analyzed the various features condition of shearing, think in the dynamic shearing process, upper and lower scissors side plane remains parallel or approximate parallel, this is to guarantee to realize good unique essential characteristics of shearing, this plane parallel displacement characteristic is exactly the necessary condition that drum-type is sheared technological requirement.So how this technology characteristics condition of specific implementation need be set up a model.The core of this model is distance (promptly the going up the cutting edge of a knife or a sword distance) Δ of upper knife edge summit subpoint on the lower scissors plane ₁The minimum thickness of slab δ that will shear smaller or equal to equipment with the absolute value of the dynamic change sum of the distance of following blade summit subpoint on last scissors plane (promptly descend cutting edge of a knife or a sword apart from) Δ 2 _MinThe maximum fluctuation amount Δ that allows of upper and lower knife face side clearance _Max, write as model and be exactly:

︱Δ ₁±Δ ₂︱≤Δ _max

Δ _MaxValue according to shearing minimum thickness of slab decision, usually Δ _Max=0.005～0.20mm because blade is generally very little to the oblique angle of y axle, is parallel to the X-axis line so ︱ Δ ︱ can regard as in addition.

Go for this model is referred in the optimization computation, six parameters will determining are write as the shear model of design variable,

X=[x ₁, x ₂..., x ₆] ^T=[R _D, R _G, H _O, E, θ _C, θ _K] ^TIn the formula: X represents Euclidean space vector array.Convert shear model to object module again $F\left(X\right)={\{}_{|X_{D1}-X_{211}|\≤{\mathrm{\Δ}}_{\max }}^{|X_{121}-X_{G1}|\≤{\mathrm{\Δ}}_{\max }}$

With upper slitter regard 1 as, down cutter regard 2 as, upper knife edge summit P then _D(X _D, Y _D) point that projects to down on the knife face is P ₁₂(X ₁₂, Y ₁₂), otherwise, be P ₂₁(X ₂₁, Y ₂₁), X in the formula _12i, X _Gi, X _Di, X _21iBe the respective symbol in the above-mentioned projection relation, the value when i is illustrated in diverse location.

Do not allow the requirement that changes with some in addition, be classified as constraints, use existing optimization calculation procedure, can solve thus: the lower scissors radius of gyration The last scissors radius of gyration

Cutter shaft centre-to-centre spacing

The cutter shaft eccentric throw

The bottom knife oblique angle

The cutter oblique angle

The present invention has produced significant effect and substantial characteristics, has solved the definite difficult problem of domestic and international helical edges cylinder class flying shear mechanism's structural parameters, the actual scope 0.2mm≤δ≤5.5mm that shears, δ _Max/ δ _Min=27.5 are higher than domestic and international 5～7 far away.Therefore use very conveniently, improved productivity ratio, flying shearing machine can be finished the task more than two, flying shear speed height, and additional dynamic power is little, flying shear part simple in structure, but strength and stiffness are big, and easy to operate, long service life.Outstanding effect is also being arranged aspect energy-conservation and the noise reduction.At shear steel plate thickness 0.2mm≤δ≤5.5mm, shear the wide B of maximum plate _Max=1920mm; Shear rate V=130,140,160,180,200,240,260,280,300m/min; Material is cold rolling, hot rolled steel plate σ _b＞65kg/mm ², because invention does not need to regulate blade side clearance under the flying shear continually because of shearing the variation of thickness of slab, bring great convenience to production, realized several the unapproachable effects of cutter.

Below in conjunction with accompanying drawing the present invention is further described:

Fig. 1 flying shear mechanism general illustration

Fig. 2 structural parameters position view of the present invention

Fig. 3 blade cutting edge of a knife or a sword of the present invention is put mutual projection relation schematic diagram

As shown in Figure 1 and Figure 2, the present invention directly determines the lower scissor blade radius of gyration R of cylinder class flying shear mechanism according to technological requirement _D, upper scissor blade radius of gyration R _G, cutter shaft centre-to-centre spacing H _O, cutter shaft eccentric shaft E, bottom knife oblique angle θ _C, cutter oblique angle θ _KThe method of structural parameters, profile length and width size at original electric system, equipment, flying shear steel plate, and whole interfaces of mechanical electronic hydraulic equipment room are not to changing, and the thickness of original shearing steel plate determined to expand to 0.3mm≤δ≤4.5mm from original 0.3mm≤δ≤2.0mm, with cylinder class flying shearing machine is example, guarantee the requirement of the constant or approximately constant of upper and lower blade side gap width when having proposed to shear, as Fig. 3, cutting edge of a knife or a sword is apart from Δ in the requirement ₁, with following cutting edge of a knife or a sword apart from the absolute value of Δ 2 dynamic change sums smaller or equal to shearing minimum thickness of slab δ _MinThe maximum fluctuation difference DELTA that allows _Max, promptly

︱Δ ₁±Δ ₂︱≤Δ _max

Δ _MaxValue according to shearing minimum thickness of slab decision, usually Δ _Max=0.005～0.20mm because blade is generally very little to the oblique angle of y axle, is parallel to the X-axis line so ︱ Δ ︱ can regard as in addition.

Go for this model is referred in the optimization computation, six parameters will deciding are write as the shear model of design variable,

X=[x ₁, x ₂..., x ₆] ^T=[R _D, R _G, H _O, E, θ _C, θ _K] ^TIn the formula: X represents Euclidean space vector array.Convert shear model to object module again $F\left(X\right)={\{}_{|X_{D1}-X_{211}|\≤{\mathrm{\Δ}}_{\max }}^{|X_{121}-X_{G1}|\≤{\mathrm{\Δ}}_{\max }}$

With upper slitter regard 1 as, down cutter regard 2 as, upper knife edge summit P then _D(X _D, Y _D) point that projects to down on the knife face is P ₁₂(X ₁₂, Y ₁₂), otherwise, be P ₂₁(X ₂₁, Y ₂₁), X in the formula _12i, X _Gi, X _Di, X _21iBe the respective symbol in the above-mentioned projection relation, the value when i is illustrated in diverse location.

Do not allow the requirement that changes with some in addition, be classified as constraints, use existing optimization calculation procedure,

As shown in Figure 1 and Figure 2, structural parameters of the present invention are defined as the lower scissor blade radius of gyration The upper scissor blade radius of gyration

Cutter shaft centre-to-centre spacing

The cutter shaft eccentric throw

The bottom knife oblique angle

The cutter oblique angle According to the present invention to six structural parameters, following examples are provided: embodiment one: when process conditions are: shear steel plate thickness δ=1.2～7.0mm, shear steel plate width B=900～2500mm, cut lengths L=2000-18000mm, sizing accuracy Δ L=± 1.5mm, maximum is cut rate of shear degree V _Max=230m/min bottom knife helixangle ₁=0.2 °, the cutter helixangle ₂=0.2007 ° of material (cold rolling, hot rolled steel plate) σ _b＞65kg/mm ²Choosing structural parameters is:

H _O=472.50mm,E=9.85mm

R _D=236.50mm,RG=237.31mm

θ _C=0.70°,θK=2.80°

The effect of present embodiment reaches actual shearing steel plate δ _Max≤ 7.0mm is used for removing to carry out the bundling scissors in the continuous acid-washing unit of large-scale cold rolling band steel and the novel pickling unit, and its output can be multiplied; Being used for the finishing line of hot rolling, carry out cutting to length, to compare with connecting rod class flying shear, maximum operating speed can improve more than 2 times, and noise obviously reduces, and operation, easy maintenance are used very reliably, and the life-span rises appreciably.

Embodiment two

When process conditions are:

Shear steel plate thickness δ=0.3-4.5mm

Shear steel plate width B=900-1850mm, cut lengths L=1000-6000mm

Sizing accuracy Δ L=± 100mm

Maximum shear speed V _Max=300m/min

The bottom knife helixangle ₁=0.65 °, cutter helical angle=0.652240 °

Material (cold rolling, hot rolled steel plate) σ _b＞65kg/mm ²

Choosing structural parameters is:

H _o=470mm,E=8.35mm

R _D=235mm,R _G=235.81mm

θ _C=0.5°,θ _K=2.0°

The present embodiment effect is very good, has sheared δ in having carried out 180 days production continuously _Min=0.3mm, δ _Max=4.5mm, the actual δ that shears _MaxCan reach 5.5mm, B _MaxThe steel plate of any specification of=1850mm, coupling has been selected V=130～300m/min for use, and inferior about 32000 times of total shear knife is produced about 1,100,000 tons of coil of strip, and use always is good, has the top standard at similar unit, and its performance has surmounted the index of similar unit.

Embodiment three

When process conditions are:

Shear steel plate thickness δ=0.1～1.0mm shears steel plate width B=500～1400mm,

Cut lengths L=400～4000mm, sizing accuracy Δ L=± 0.25～± 0.5mm,

Maximum shear speed V _Max=300m/min

The bottom knife helixangle ₁=0.98 °, the cutter helixangle ₁=0.9834 °

Material (cold rolling, hot rolled steel plate) σ _b＞65kg/mm ²

Choosing structural parameters is:

H _O=466.50mm,E=7.35mm

R _D=233.20mm,R _G=234.01mm

θ _C=0.40°,θ _K=1.6°

Present embodiment also has good shear effect, the shear rate height, and additional dynamic power is little, improved shear ability significantly, the shearing area polishing plays a positive role to reducing the steel plate division, use very conveniently, improved production efficiency, flying shearing machine have been finished former workload more than two.

Claims (2)

1, a kind of method of deciding parameters of drum-type flying shears mechanism according to technological requirement is characterized in that:

1. set up a model by technological requirement, promptly distance (promptly the going up the cutting edge of a knife or a sword distance) Δ of subpoint is ended on the upper knife edge summit on the lower scissors plane ₁Distance (promptly descending the cutting edge of a knife or a sword point) Δ with following blade summit subpoint on last scissors plane ₂The absolute value of the dynamic change sum minimum thickness of slab δ that will shear smaller or equal to equipment _MinThe maximum fluctuation amount Δ that allows of upper and lower knife face side clearance _Max, promptly

︱Δ ₁±Δ ₂︱≤Δ _max，

2. model is referred in the optimization computation and go, six parameters will determining are write as the shear model of design variable, promptly

X=[x ₁,x ₂,…,x ₆] ^T=[R _D,R _G,H _O,E,θ _C,θ _K] ^T

3. further convert shear model to object module, promptly $F\left(X\right)={\{}_{|X_{D1}-X_{211}|\≤{\mathrm{\Δ}}_{\max }}^{|X_{121}-X_{G1}|\≤{\mathrm{\Δ}}_{\max }}$

4. according to object module, obtain lower scissor blade radius of gyration R respectively _D, upper scissor blade radius of gyration RG, cutter shaft centre-to-centre spacing Ho, cutter shaft eccentric shaft E, bottom knife oblique angle θ _C, cutter oblique angle θ _K

2, the method for this deciding parameters of drum-type flying shears mechanism according to technological requirement according to claim 1, its feature are that also the thickness range of shearing steel plate determines to expand to 0.3mm≤δ≤4.5mm from 0.3mm≤δ≤2.0mm.

Images