SU1225657A1 - Method of producing hollow axially symmetrical articles with a flange - Google Patents

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow parts with a flange, for example, by means of face rolling, sphere-motion pressing and sludge.

The purpose of the invention is to improve the quality of products for: by increasing their geometric and dimensional accuracy. ,

FIG. Figure 1 shows the process of making the conical part of the workpiece for a part with an internal flange at the initial and final moments; in fig. 2 - the same for a blank with an outer flange; Fig. 3 is a diagram for determining the dependence of the position of the inflection plane on the angle of the cone; in fig. 4 - a billet with an extended conical part of it, installed and fixed in the matrix, at the moment of the beginning of deformation of the metal at the end, for example, face rolling, sphere-and-wheel pressing or sludge.

Consider the essence of the proposed method by the example of forming a part from a cylindrical billet with an internal flange.

Before installing the workpiece 1 for the operation of the final formation of the part, the workpiece is subjected to the operation of forming the conical part of the workpiece on any high-performance equipment for metal forming, for example, on crank presses (Figures 1 and 2). In this case, an inflection line is formed on the inner surface of the preform 1 at the interface between the conical and cylindrical parts of the conical and cylindrical parts. Obviously, the position of the inflection line will affect the quality of the product. At a certain angle of the cone oi. after the installation of the workpiece 1 in the matrix 2, not below the surface of the matrix forming the lower end of the flange of the part (Fig. 3 and 4), the bending line must lie. If the inflection line lies below the specified surface of the matrix 2, then the lower end of the cylindrical part of the workpiece does not touch the surface of the stream of the matrix 2, which forms the lower end, of the part. Then the formation of an obstacle to the flow of metal into the cavity of the matrix stream forming the lower end of the metal is possible. When this happens, the cavity of the matrix will not be filled, and the surplus of metal will go to the burrs formed in the zone of action of the punch 3. Thus

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Thus, if the inflection line lies below the surface of the matrix stream, the forms of the lower end of the flange will not improve the quality of the product.

The same inflection line is formed at the junction of the outer forming conical and cindral parts of the workpiece 1. If the outer inflection line lies on the BELLE surface of the matrix 2, which is in contact with the punch 3 and bounds the upper end of the gauge of de. the surface of the punch and the die and the formation of disc around the outer and inner diameters of the flange, means that there will be no improvement in the quality of the product in this case. From this it follows that the interface of the conical and cylindrical parts of the workpiece, passing through the outer and inner bend lines, must lie within the planes limiting the thickness of the flange of the part.

To determine the dependence of the position of the interface plane on the angle of the cone, determined by the ratio of the thickness of the flange to the wall thickness of the cylindrical part of the workpiece, consider the two triangles shown in FIG. 3

In Al b and dk to, there is one common angle, defined by the relation tgoi --- -, where h is the thickness

flange; d is the internal diameter of the original billet, D is the external diameter of the original billet. Angles ab by construction. So abb, i.e. we have two triangles with equal angles. But the thicknesses of the walls of the chambered and conical parts of the billet are the same, therefore, db-aq, d-d. From here

 2 it can be argued that dab b AdkV.

Considering that y and d have a common angle uf and the vertices of the corresponding angles are opposite one another, it is possible to conclude that the line is the axis of symmetry of the quadrilateral, and from this it follows that line ak divides the angle d. in half.

5 In this case, the line ak characterizes the slope of the plane of the conjugation of the conical and cylindrical parts of the blanks, i.e. determines the

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This plane is relative to the angle of the cone. If the outer bend line of the cone and cylinder forming lies in the plane of the matrix in contact with the punch during processing, then the inner bend line lies in the middle of the flange thickness provided that the half of the cone angle is determined by the ratio of the flange thickness to the wall thickness of the cylindrical part of the workpiece. In this case, we have an optimal tolerance field for the position of the interface plane, which is equal in magnitude to half the flange thickness.

In the event that the cone angle is less than that determined by the ratio of the flange to the wall thickness of the part, the shape of the workpiece will approach the cylindrical shape, then there may be an excess flash and an unjustified increase in the upsetting force. If the angle of the cone is greater than that determined by the ratio of the thickness of the flange to the wall thickness of the part, the tolerance field for the position of the interface of the conical and cylindrical parts of the workpiece will decrease.

Therefore, it can be argued that the half angle of the cone is determined by the ratio of the flange thickness to the wall thickness of the cylindrical part of the workpiece, providing under this condition an optimal tolerance field for the position of the interface plane of the conical and cylindrical parts of the workpiece at the time the workpiece is set to the final deformation position.

The direction of the slope determines the direction of the metal flow, helps to reduce the precipitation force and fill the profile of the matrix die forming the part flange, for. partial replacement account at the initial moment of effort of precipitation on the bending force. The same statements are true for the part with the outer flange.

The application of the proposed method will reduce the loss of metal in the bubble and ensure the filling of the profile of the stream of the matrix, and therefore, improve the quality of 1 in the resulting products.

As examples of the implementation of the proposed method, parts are manufactured: a sleeve with an internal flange and a spring seat with an external flange. Materia: g of both parts - Steel.

During the experimental work of g (lg to the static deformed 2 = 6574

NICK) sleeves are first produced on a lathe by turning a tubular ring billet. Processing Modes:

Speed

g spindle, rpm 630 Longitudinal feed, mm / ob0.43 Cross-feed, mm / ob0.21 10 Total piece

time, mino, A5

Then, on the crank press, the tapered part of the workpiece is made of dates. The tilt angle of 3212 ° is determined by the ratio of the thickness of the flange to the wall thickness. Modes: force 95 ts, machine time 0.8 s.

Further, the workpiece is installed in the matrix of the experimental sphere-moving press and deformed into the end face before filling the caliber mattress; s of the workpiece metal under the modes: Press forces, ts90

The number of swings of the punch in 1 min200 Feed, mm / s0.8 Machine time, from 13 Force of pressing, tc30

After extrusion, it is found that it is insignificant; bubble formed

only at the periphery of the flange. Chipping and chamfering in accordance with the drawing are performed on a lathe, as a result, a sleeve is finally obtained.

Similarly to the process of obtaining sleeves, a spring seat with an outer flange is obtained. First, on a lathe, a pipe ring billet is obtained by turning under the following conditions: Spindle speed, rpm 630 Longitudinal feed,

mm / ob0,09

Cross feed, mm / ob0,09 Total, piece time, min1,2

Then on the crank press get the conical part of the workpiece under the modes: force 40 tf, machine time 0.8 s.

The angle of the forming conical part of the workpiece is pre-determined by the ratio of the thickness of the flange

to the thickness of the strip and is equal to 37, However, when measured, the diameter of the large OC: TIO- cone is 45 mm. This is greater than the diameter of the flange and leads to an inadequate fy increase in burr, and hence to metal loss. Therefore, choose the angle of inclination of the cone forming equal to 30 °.

After performing these operations, the blank is placed in the mat.

1gr (m: g (and deformed at the end under the modes: Pressing, ts 60 = punch t in min. 200 Feed, mm / s0.8 Machine time, from 15 Vypressovy force, ts 20 Later, after removing and chamfers get saddle pruzhpnt ..

F1A .. 2

Editor V. Petrash

Compiled by M. Tarlavska

Tehred I. Veres Corrector V. Butt ha

Order 2021/8 Circulation 655 ° Subscription

VNIIPI State USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, And

FIG.

Claims (2)

1. METHOD OF MANUFACTURE HOLLOW AXISYMMETRIC PRODUCTS WITH A FLANGE, at which a workpiece is obtained, set and fix it in a matrix, after which it is deformed into an end face, characterized in that, in order to improve the quality of products by increasing their geometric and dimensional accuracy, upon receipt of the workpiece a conical section is formed on it, the generators of which are inclined to the periphery of the finished product flange. 2. The method according to claim 1, characterized in that the mating zone of the conical and cylindrical sections of the workpiece is performed within the flange thickness, and the volume of the workpiece metal under the flange of the finished product is equal to the volume of the metal of the flange. Figure 1 and ... 1225657