Method of rotation drawing of hollow shaped parts

FIELD: plastic metal working.

SUBSTANCE: method comprises setting the blank in the mandrel provided with the cylindrical and shaped sections, locking the blank in the cylindrical section of the mandrel, and affecting the blank by deforming rollers. The shaped section is initially formed by moving the rollers in different trajectories during one or several runs. Upon unlocking the cylindrical section, the blank is locked in the shaped section and the cylindrical section is drawn by moving the rollers in the opposite direction.

EFFECT: expanded function capabilities.

1 cl, 3 dwg, 2 tbl

 

The invention relates to the field of metal forming, namely the manufacture of hollow geometrically-complex parts, such as various shells of steel and aluminum alloys, gas cylinders, lanero, fire extinguishers, etc.

The most important issues in the production of parts of complex profile, which is a combination of cylindrical, conical and curved sections, is the principal possibility of their receiving rotary hood with high accuracy, the quality of the processed surface and high performance.

Currently, there are many ways rotary hood details: unijunction and mnogoprohodnym rotary extractor, rotary swaging, rotary broaching and other, cold and heat.

For example, in the book Niemoeller "Rotary extractor shell parts on the machines"; Moscow: Mashinostroenie, 1983, describes the different ways to get shell parts rotary hood.

A disadvantage of the known schemes applied to the problem of obtaining parts with a complex profile of a large length, variable wall thickness and variable diameter is the inability to obtain these parts from well-known schemes due to the complexity of their form.

Closest to the technical essence and the achieved technical result is the is the rotational extrusion", implemented by the device (A.S. No. 1215798, class B 21 D 22/6, application No. 3777993 from 08.08.84, "Discoveries, inventions, No. 9, 1986, VNIIPO p.32), in which the source of the workpiece mounted on the mandrel, is fixed from the beginning of treatment, after which the form rollers of the cylindrical section by wall thinning and elongation of the workpiece, and then carry out the deformation of the conical section. The whole process enables processing of all procurement direct rotary extrusion.

This method adopted by the authors for the prototype.

As can be seen from this technical solution, the formation process is performed on the sliding mandrel, starting from the fixed cylindrical section in a direction from the large diameter to the small. At the beginning of the form rollers of the cylindrical section, and then tapered. Direct rotary extrusion provides metal flow in the direction of rolling.

For reasons that impede the achievement of the technical result when using the known method adopted by the authors for the prototype, is the inability to use the sliding mandrel in the manufacture of parts of great length, with a large drop diameters direct rotary extrusion and to ensure the high stability of the deformation process.

Thus, the objective of this technical solution was with the building of a method of processing workpieces of a short length with a small drop diameters direct rotary extrusion sliding on the mandrel.

Common features with the proposed method is to install the original piece on the mandrel, the cylindrical core sections, fixation on the cylindrical section of the mandrel and the impact on the workpiece deforming rollers.

Unlike the prototype proposed by the authors in the rotational hoods hollow clonazepamonline parts originally for one or more passages form the core of the plot by moving the rollers along different trajectories, and after the liberation of the cylindrical section from fixing the workpiece is fixed on the profile plot and carry out forming a cylindrical section by moving the rollers in the opposite direction.

In the particular case, that is, specific forms of implementation, the invention is characterized by the following features:

after each pass of the workpiece move in the axial direction from the larger diameter to a smaller, providing a uniform strain distribution along the aisles on the core area, defined by the formula:

ΔD=(D0-Dto)/n

where ΔD is the change in diameter of the workpiece at each passage (mm); D0- the original workpiece diameter (mm); Dto- the target workpiece diameter (mm); n - number of passes.

It allows to make a conclusion about the presence of the reasons the but-effect relationship between the set of essential features of the proposed technical solution and achievable technical result.

These characteristics, distinctive features of the prototype and to which the requested amount of legal protection, in all cases sufficient.

The task of the invention is to enable rotation of the extrusion hollow parts of a complex profile of great length, with a large drop diameters at high stability of the deformation process.

This technical result in the implementation of the invention is achieved in that in the known method, including installation of the original piece on the mandrel, the cylindrical core sections, fixation on the cylindrical section of the mandrel and the impact on the workpiece deforming rollers, the peculiarity lies in the fact that, initially, one or more passages form the core of the plot by moving the rollers along different trajectories, and after the liberation of the cylindrical section from fixing the workpiece is fixed on the profile plot and carry out forming a cylindrical section by moving the rollers in the opposite direction.

A new set of operations, and the existence of linkages between them allow, in particular, due to:

- formation of the profile plot for one or more passages by moving the rollers along different trajectories to divide the deformation ABM is the od and on each pass, in the result, to increase the stability of the deformation process,

- release the cylindrical portion of the fixation, the subsequent fixing of the workpiece on the profile plot and the implementation of forming a cylindrical section by moving the rollers in the opposite direction - allows shaping a cylindrical section by a rotary extractor fan in the reverse direction to obtain details of great length, with high stability of the deformation process.

The features characterizing the invention in specific forms of execution, allow, in particular, due to:

- displacement of the workpiece after each pass in the axial direction from the larger diameter to a smaller and uniform distribution of deformation along the aisles on the core area, defined by the formula:

ΔD=(D0-Dto)/n

where ΔD is the change in diameter of the workpiece at each passage (mm); D0- the original workpiece diameter (mm); Dto- the target workpiece diameter (mm); n - number of passes, to increase the stability of the deformation process through continuous contact of the workpiece with a mandrel in the process of machining a large length.

The distinguishing features of the proposed solution, from the prototype, not identified in other technical solutions, and not what swesty from the prior art in the process of patent research, that allows to make a conclusion about conformity of the invention, the criterion of "novelty".

Examining the prior art during the patent search all kinds of information available in countries of the former USSR and foreign countries, found that the proposed technical solution is not obvious from the known prior art, therefore, it is possible to conclude that the criterion of "inventive step".

The invention consists in that the rotational hoods hollow clonazepamonline parts, in which the source of the workpiece mounted on the mandrel, the cylindrical core areas, fixed on the cylindrical section of the mandrel and act on the workpiece deforming rollers, unlike the prototype according to the invention initially for one or more passages form the core of the plot by moving the rollers along different trajectories, and after the liberation of the cylindrical section from fixing the workpiece is fixed on the profile plot and carry out forming a cylindrical section by moving the rollers in the opposite direction.

The invention is illustrated in the drawing, in which figure 1 shows the workpiece in the initial position and the first passage forming of the profile plot in figure 2 - second prob is on the formation of the profile plot figure 3 - forming a cylindrical section.

Figure 1 shows a workpiece having a size of D0and t0the diameter and thickness of the workpiece in the initial position; t1- wall thickness after the first iteration, L1- the length of the profile plot after the first iteration.

In the particular case of figure 2 shows the workpiece is shifted after the first pass, the formation of the specialized section on value ΔL1sizes: L1- length of the relevant section of the workpiece after the first iteration, t1- wall thickness after the first iteration, D1the diameter after the first iteration, L2- length of the relevant section of the workpiece after the second pass, t2the wall thickness of the second pass, D2the diameter of the second pass.

The above-described rotational extraction is carried out as follows.

The source of the workpiece 1 (see figure 1), is made of a pipe by cutting it into measured workpiece and machining, mounted on a frame 2 mounted on the spindle forming machine.

Then the workpiece is fixed on the cylindrical section of the mandrel from the end face And the pressing protrusion of the workpiece ring 3 to the supporting surface of the ring 4 puller 5.

Set the rotation of the spindle S with the mandrel 2 and the workpiece 1, the promotion of the rollers 6, the axial displacement of the caliper F rol is kami and radial movement of the rollers.

In one or more passes of the deforming rollers form the original core area (see figure 1, 2).

Then release the fixation of the cylindrical section of the workpiece (see figure 3) and is fixed by the clamp 1 is a profile section, then perform the rotary hood cylindrical section by moving the rollers F in the opposite direction - to the end of A.

The cylindrical section becomes thinner in the abs with thickness t0(see figure 3) to the thickness tCand extends with a length L0to LC.

Example.

Preparation of hot-rolled tubes ⊘ 180 mm, a wall thickness of 16 mm of steel after 35 pipe cutting on the workpiece and machining mounted on the mandrel, is fixed on the cylindrical section of the mandrel and initially form a 4 pass profile plot.

After each pass of the workpiece move in the axial direction from the larger diameter to the smaller of the conditions of uniform distribution of deformation of the crimping along the aisles, calculated by the formula:

ΔD=(D0-Dto)/n

where DO- the original workpiece diameter (mm); Dto- the target workpiece diameter (mm); n - number of passes.

Then for DO=180 mm, Dto=80 mm, n=4,

ΔD=25 mm, D1=155 mm, D2=130 mm, D3=105 mm,

D4=80 mm

For such values of ΔD is the absolute deformation of the crimp on each of the passage, offset billet ΔL and the length of the profile sections at each iteration L, respectively(see table 1):

Table No. 1
no passThe workpiece diameter D, mmOffset procurement ΔL, mmThe length of the profile section L, mm
115540190
213020320
310510420
4800510

Wall thickness after each pass based on the minimum degree of deformation of the wall ε≤10%, respectively (see table 2):

Table No. 2
No. of transitionWall thickness t, mmThe degree of deformation ε, %
1a 9.5 and 9.83,5
29-9,54
3of 8.4 to 8.86,5
47,6-7,89

Then execute without displacement of the workpiece calibrating the passage forming the profile of the site to ensure the highest Chi is toty surface and precision machining. The size of the workpiece on the profile plot will be: diameter D5=60 mm, length l5=530 mm, wall thickness t5=7,25, the degree of deformation ε5=5,5%.

After the processing of the profile plot, free from fixing the cylindrical section, fix the workpiece on the profile plot and carry out a rotary hood cylindrical section by moving the rollers in the opposite direction - to the end (see figure 3).

The wall thickness of the workpiece on the cylindrical section varies with t0=10 mm to tC=7,25 mm, length L0=425 mm up to LC=600 mm, the degree of deformation εC=27,5%.

Perform rotational hoods hollow geometrically-complex parts in accordance with the invention enables the manufacture of hollow parts of a complex profile of great length, with a large drop diameters at high stability of the deformation process and, simultaneously, to reduce processing time, reduce the number of passes of the rotary hood, to reduce the complexity of manufacturing.

The invention can be used in the production of various shells of steel and aluminum alloys are of great length, with a large drop diameters.

Specified positive effect is confirmed by tests of prototype parts produced by this method.

Currently the time developed technical documentation, the tests outlined serial production under the proposed method.

1. The rotational hoods hollow clonazepamonline parts, in which the source of the workpiece mounted on the mandrel, the cylindrical core areas, fixed on the cylindrical section of the mandrel and act on the workpiece deforming rollers, characterized in that, initially, one or more passages form the core of the plot by moving the rollers along different trajectories, and then after the liberation of the cylindrical section from fixing the workpiece is fixed on the profile plot and carry out the hood cylindrical section by moving the rollers in the opposite direction.

2. The method according to claim 1, characterized in that after each pass of the workpiece move in the axial direction from the larger diameter to a smaller, providing a uniform strain distribution along the aisles on the core area, defined by the formula

ΔD=(D0-Dto)/n

where ΔD is the change in diameter of the workpiece at each passage, mm.

D0- the original workpiece diameter, mm;

Dto- the target workpiece diameter, mm;

n - number of passes.



 

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