SU1699689A1 - Method for deforming workpiece - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to methods for the production of articles by the method of forging by rolling. The purpose of the invention is to increase the service life of the resulting products by creating a directional fibrous structure along their section. For this, workpiece 2 is processed with height H and radius R with a conical deforming tool 1 with a longitudinal axis inclined at an angle, making a running motion under the condition I 0.3 H / R, where A is the ratio of the contact area between the tool and the workpiece to the face area deformable blanks; H is the conical height of the workpiece; R is the final radius of the billet. 2 Il.

Description

determine the feed, which should provide the necessary value of the parameter I:

arctg 0.017 “1 °.

with 2 Rx -tgy A2 (0.45) 2

0.116 mm / rev.

The speed of the vertical movement of the tool must be equal to V S n 11.6 mm / min.

We choose the feed rate S 0.1 mm / rev, which ensures the fulfillment of condition A 0.3 HK / RK. Accordingly, we set the speed of the vertical movement of the tool (traverse of the press) to V 10 mm / min.

The tests of the spiral-shaped preforms obtained by the described method showed an increase in fracture toughness (crack resistance) by a factor of 1.5–2 compared with blanks without a directional texture formed.

The value of A is determined equally by the angle of inclination y and the feed S, which follows from the expression

A 0.45

2 R tg y

To provide a predetermined value A, which is associated with the final dimensions of the workpiece to be stamped, we can change either S or y, which is determined by the type of equipment. For example, the well-known PXN-100 rounding presses have an adjustable tool inclination angle y in the range of 0-2 °, and the feed is unchanged, since it depends on the vertical movement speed V and the angular rolling speed n (SV / n), which are fixed values for this machine.

We suggest that the angular rolling speed n 200 rpm, the speed V 100 mm / min (both values n and V const), i.e. we have a fixed feed rate of S 0.5 mm / rev.

It is required to perform the machining of the part according to the indicated method with final dimensions Hk 10 mm, RK 40 mm. Then from the formula we get

Therefore, in order to obtain a spiral structure, the angle is extended to be greater than 1 °.

When processing a part with dimensions of Нк 20 mm, RK 50 mm (for the same equipment)

y arctg MDl 2-50-0.3 §

 arctg 0.084 0 ° 3o

those. tilt angle must be greater than 0 ° 30. For parts with HK 4 mm, RK 100 mm (the other parameters are the same)

y - arctg (° 45) 2 ° 5 - 7 drcig 2 -100 -0.3-4 / 100

 arctg 0.042 2.4 °.

those. the angle must be greater than 2 °. Therefore, the processing of the last part on this equipment, whose angle y can be changed within 0-2 °, is impractical because the effect of the formation of the structure will not be observed.

For equipment with a constant angle of inclination, the speed of the stroke (the speed of the axial movement of the tool V) can vary. In this case, to satisfy the condition A 0.3 H / R, the feed rate can be varied.

For example, the press C82.201 has an adjustable value of n 60-200 rpm, V 50-150 mm / min, the angle of inclination is 2 ° const. Then, for a workpiece that cannot be machined with a PXN-100 press (Hc 4 mm, RK 100 mm), it is possible to reduce the speed V and, consequently, with the feed, to obtain a part with an increased service life. So, the feed in this case should be less

s 2R-tgy2A2mm /

(0.45) 2

At n 200 rpm, the velocity V should be V 0.42 200 84 mm / min, i.e. By reducing the velocity V, we get a part with the desired texture formation effect.

The method allows to increase the performance (service life) of, for example, punches for cold-set automats by 2-2.5 times. For the metal base of diamond wheels, the service life increases by 1.5-2.0 times.

Claims (1)

The formula of the invention l. The method of deforming the workpiece by applying the axial force ij of the conical deforming tool with a tilted longitudinal axis while simultaneously conveying to it a rolling motion, characterized in that in order to increase the service life of the resulting products by creating a directional fibrous structure over their cross section, the ratio of the contact area between the tool and the workpiece to the end area of the deformable workpiece when determining the angle of inclination of the longitudinal axis of the tool and its feed per revolution , 3Ј where A is the ratio of the contact area between the tool and the workpiece to the square of the end face of the deformable workpiece; R is the final radius of the workpiece; H - the final height of the workpiece. FIG. I