Method of rotary drawing of ogival and conical articles

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to rotary drawing of ogival and conical articles. Billet drawing is carried out at mandrel by, at least, two spinning-rolling rolls arranged displaced relative to each other. In said drawing, front roll deforms the billet by reduction making half the preset amount while rear roll deforms it to preset thickness in continuous deformation zone. Displacement of rolls in vertical plane is defined by enclosed formula.

EFFECT: required quality of inner and outer surface and accuracy of article wall thickness.

1 dwg

 

The invention relates to the processing of metals by pressure, in particular by rotating the hood (PB) ogival and conical products, namely the retrieval quality of the internal and external surfaces and the accuracy of obtaining the specified wall thickness along the profile.

Known rotational extrusion of cylindrical articles pulley with the special design of the geometry of the deforming roller with a supporting platform for a stable process according to the classical scheme of the law of sine and prevent intensive process of influx of metal before the deforming roller and / or corrugation flange due to the geometry of the site (Creditor M.A. Pressure of work and rotary extrusion., M: mechanical engineering, 1971 press, p.104-105).

This method is used only for conical and cylindrical parts due to strict conformity with the geometry of the platform angle α and cannot be used to obtain details of ogival shape due to the continuous change in the angle α as the defining characteristic was alive.

The closest in technical essence is a way rotary conical hoods products, including rotary hood blanks on the mandrel pressure-raschetnymi rollers mounted offset relative to the vertical plane. During a rotation you is Aiki the front pressure-rolled rollers deform the workpiece with compression is less than the specified, and the rear deform the workpiece with more compression set (RF Patent №2007242, 15.02.1994).

The disadvantages of the method described in the patent, are the lack calculate the displacement of the rollers relative to the vertical plane that leads to marriage in the parties, and the inability to apply for rolling ogival items since the patent involves Nepalganj to the mandrel by rolling the first pair of rollers, and consequently, the inability to control the profile of the workpiece before the final processing of the two (or third) roller.

The technical result, which directed this invention is to obtain ogival and conical products with maintaining the quality of the internal surface, the external surface of high quality with high precision specified wall thickness of the product and with a specified deviation from the profile with maximum economic efficiency and a typical pressure-Raskatov roller.

The technical result is achieved due to the fact that the rotating hood ogival and conical products produce typical pressure-raschetnymi rollers, and the first deforming roller simultaneously plays the role of a supporting platform, as in a special spot; to stain contact of the rollers with R1and R2was continuous deformation zone, the optimum offset A of the centers of the radial part of the profile of the rollers relative to the vertical plane is calculated by the formula

where A is the displacement of the rollers relative to the vertical plane, mm;

R2is the radius of the second calibrating roller, operating in the mode of the estimated compression to obtain a given thickness, mm;

S1the thickness of the material after processing roller with R1mm;

S2the thickness of the specified part, mm.

α is the maximum angle between the axis of the workpiece and forming a profile of the product, hail.

The value of S1can be chosen as half of the total deformation from the original material for rolling to the desired thickness. The radial displacements of the centers of the rollers is calculated based on the required gaps between the mandrel and roller for PB according to the law of sines to the setting of the rollers on the CNC program:

z=S0-k;

where z is the magnitude of the gap between the mandrel and the roller R1mm;

S0the thickness of the original blank, mm;

k - elastic deformation equipment, constant for the same type of metal of the workpiece and the machine, mm

The invention is applicable to obtain a rotary exhaust products as ogival and conical processes, where the classical scheme PB influx of metal destroys part or instability of a flattening process leads to thickness variation of the received items outside of tolerances, especially for P is thin-walled products.

The invention is illustrated in the drawing. The drawing shows the mutual arrangement of the pressure-rolled rollers (radial parts R1and R2profiles of the rollers) and a portion of the mandrel length H considered in the case of ogival products as part of the cone, due to small changes of the angle α on small sections of the profile.

The increase in R2with respect to S2in the processes of RV products reduces the accuracy of calculations. The main continuous deformation zone is not recommended to decrease, taking into account α<αmaxwhere αmax- the maximum angle of the generatrix of the mandrel. In the case of sudden change of the angle α for ogival products recommended to introduce an intermediate transition RV. The optimum offset of the centers of the radii for RV products relative to the vertical plane defined by the formula (1). The value of N is a continuous deformation zone consisting of two contact arranged in series.

The method is as follows.

On a mandrel (not shown), where α (item 7) is the maximum angle between the axis of the product and forming a profile of the product, set the workpiece 1 in the thickness S0corresponding to PB by law "sine" for the desired product with a wall thickness of S2(item 6), which clamp the tailstock quill. The rollers 2 and 3 (R1and R21and R2respectively and calculated the working gap (radial displacement); for each roller gap is chosen as in the classical scheme of the RV. S1(item 5) is the thickness of the material after processing roller with R1. Then the CNC programs, determining the independent movement of the calipers, the respective rollers with R1and R2in each moment of time on the relevant portion of the mandrel H (item 4) is produced by rotating the hood of the product. The working part of the product is rolled by the rollers is calculated according to the formula (1) shift of A relative to the vertical plane and get the item required thickness S2(item 6). The reverse flow of the metal does not occur.

Example.

On the horizontal Rosatom dogsports mill APED-1200 with stand Sinumeric 840-D was made PB ogival and conical products pressure-raschetnymi rollers with R1=9 mm and R2=9 mm

Rotary extractor is made conical part of the workpiece S0=1.2 mm to S2=0,6±0,05 mm, the angle of the finished product α=17,37°.

Define S1=0.85 mm from the calculation of S1=S0-(S2-S0)/2-0,05 (PB process selected from the like), then

Rotary extractor made ogiva the performance communications details of the procurement

S0=5,4 mm to S2=2,8±0,1 mm, the angle of the finished product α=26°÷9,6°. Define S1=4,l mm from the calculation of S1=S0-(S2-S0)/2, then the offset And calculated by the formula

The process PB is held steadily, without flows on the roller R1or corrugation flange. Details meet the high requirements of accuracy to the profile and wall thickness, with the purity of the inner surface to the 10th grade and purity of the outer surface to 8th grade.

The rotational hoods ogival and conical products, including rotary hood blanks on the mandrel pressure-raschetnymi rollers mounted offset relative to the vertical plane, characterized in that in the process of rotating hoods use at least two pressure-rolled rollers, creating a continuous deformation and displacement of the rollers relative to the vertical plane is set by the following dependencies:

where A is the displacement of the rollers relative to the vertical plane, mm;
R2is the radius of the second calibrating roller mode
the estimated compression to obtain a given thickness, mm;
S1the thickness of the material after processing roller with R1mm;
S2the thickness of the specified part, mm.
α is the maximum angle between the axis of the workpiece and forming a profile of the product, grad.



 

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