SU1493369A1 - Method of producing annular articles with rim and ridge - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to the technology for the manufacture of ring products with a crest, such as rail tires. The purpose of the invention is to increase the productivity of the manufacturing process by reducing the amount of rolling in diameter. The ring billet is rolled in a rough gauge on a ring rolling mill. At the rough rolling stage, a semi-finished product with a rim and a ridge 0.5–0.7 in height of the ridge of the finished product is formed with the length of the ridge-forming profile equal to the length of the forming ridge of the finished product, by making it wavy in a series of alternating ridges and valleys. Then, the obtained semi-finished product is rolled in a finishing caliber, where the product with final ridge dimensions is made by displacing the metal from the rim area. The invention allows, by reducing the friction of the metal against the walls of the tool, to facilitate the filling of the finishing caliber, which significantly reduces the amount of ring rolling in diameter. 1 ill., 1 tab.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of ring products with a crest such as railway tires.

The aim of the invention is to increase the productivity of the process of manufacturing ring-shaped products with a crest, such as rail tires, by reducing the amount of rolling in diameter.

In the drawing, which shows the general profile of the ridge in the draft and finishing calibers, indicated: 1 - profile of the ridge in the draft caliber; 2 — comb profile in pure caliber;

B „,„ „is the height of the ridge in the rough kac sgp

libra; h cst height ridge in fine caliber.

The method is carried out as follows.

The billets are heated to a deformation temperature (1150-1 280 s), which depends on the steel grade, is subjected to settling, distillation with a punch and piercing on a press. The resulting intermediate ring billet with geometrical parameters Dj-dotHp is transferred to the roughing ring-rolling mill. When the ring blank is deformed on a roughing mill, it is preliminarily formed on it.

SO OO SLE O

A height of 0.5-0.7 is the height of the ridge of the finished product with the length of the ridge profile forming the length of the ridge profile forming the finished product profile, which is achieved by performing the ridge forming the profile of the rough draft wavy in the form of a series of alternating protrusions and depressions. Said generatrix can be executed, for example, in the form of a sinusoidal curve, i.e. the radius of the arcs forming depressions is equal to the radius of the arcs forming the protrusions. Then, a rough billet with a rim and a pre-formed ridge is transferred to the finishing ring-rolling mill, where, by directing the flow of metal from the inner layers of the rim, isels are obtained with the final dimensions of the ridge.

Example. Iron bandages are made from steel of grade 55 according to GOST 1050-74 with dimensions according to GOST 20179-74; diameter in a circle of Katani 68 mm, internal diameter 566 mm, width 104 mm.

As the initial blank, ingots with a diameter of 500 mm and a mass of 3 tons were used, which were divided into individual blanks. The billet was heated to a deformation temperature (1220-1250 ° C). After operations, precipitation, distillation and firmware were annular billet sizes

1st version 600x420x105 mm;

2nd version 550x350x105 mm.

These blanks were subjected to rolling on a rough ring-rolling mill before forming a ridge with a height of 0.3–0.8 in the height of the ridge of the finished product and% of a section with the length of the forming ridge profile equal to the length of the forming ridge profile of the finished product, which was achieved by performing the ridge forming the profile of the rough blank wavy in the form of a number of alternating protrusions and depressions during rolling in rough gauges of the corresponding profile. Then, rough blanks with a pre-formed rim and a crest were transferred to the finishing ring-rolling mill and the production of bandages with final dimensions and profile was made.

The results of the quality control of the bandages made from the specified billet in accordance with the described} first method, as well as (g similar to

0

five

The mode of rolling) according to the prototype method is given in Table 1.

When making a ridge in a rough caliber with a height of less than 0.5 of the height of the ridge of the finished product, the ratio of the depth of the protrusions and depressions to their width increases, which leads to a fuzzy NP, making a profile on the roughing or forming clamps on the finished product.

When performing a ridge in a draft caliber with a height of more than 0.8, the height of the ridge of the finished product makes it difficult to clearly define the profile of the ridge in the draft (due to its considerable height), and then also in the fine gauges.

In the manufacture of bandages 686x x566x104 mm according to the prototype method of an annular billet with dimensions 470x x 200x105 mm, the amount of rolling in diameter at which the scrap is minimal is 216 mm. The rejection rate for non-compliance with the profile is 0.3-0.4%.

As the experiments showed, the excess of the length of the ridge profile in the roughing gauge relative to the length of the finished product profile leads to the appearance of sunsets, the depth of which increases with the increase in the specified ratio.

The reduction in the length of the forming profile of the 5 l ridge of the rough caliber is ambiguous and depends on the degree and change in the undulation of the profile along the length of the generator. When reducing the length of the generatrix (as a result of a uniform decrease in the depth of the waviness during the manufacture of the gauge by machining by copier), it is difficult to fill the finishing gauge. At a given amount of rolling, this leads to the failure of the profile of the ridge (Table 2). At the same time, a slight decrease in the length of the ridge forming profile in the roughing caliber, which occurs as a result of its wear during the rolling process, does not have a noticeable effect on the filling of the finishing caliber. Thus, in the process of making bandages in accordance with GOST 20179-74, the length of the forming ridge profile of the rough billet decreased 5 TO 0.93 of the length of the ridge forming the finished product, while the quality of the ridge of all gangs complied with the requirements of the standard, which is explained by non-uniformity new

0

0

51493369

gauge along the length of the forming ridge: the decrease in the length of the forming was due to the areas at the entrance to the caliber that were subjected to the most intensive wear, while the areas adjacent to the top of the ridge, which were most difficult to fill in in the finishing caliber, retained their original shape.

when using the blank bbh x420h105 mm (the amount of rolling 86 mm) - by 25%;

when using the billet 550x h350x105 mm (the amount of rolling 126 mm) - by 15%.

The quality of products meets the requirements of GOST 20179-74,

Further increase in the difference between the lengths forming the profile of the ridge in the draft and finishing caliber

(, 88-0,) as a result of wear of the rough gauge led to the non-fulfillment of the profile of the ridge of the finished product. With increasing wear, the degree of non-fulfillment of the profile increased.

The tool allows you to facilitate the filling of the gauge that forms the finishing profile by eliminating friction of the metal against its wall and at the same time significantly reduce the amount of rolling products in diameter, and consequently, increase the productivity of the process. Thus, in comparison with the prototype method (the amount of rolling 216 mm), the productivity is improved:

Table 1

The results of quality control of railway tires of 686x566x104 mm in size according to GOST 20179-74

86 86

Prototype previously outlined

136

136

Prototype previously outlined

ten

Claims (1)

Invention Formula five 0 to. A method of manufacturing ring products with a rim and a flange like a rail band by rolling a billet successively in draft and finishing gauges, characterized in that, in order to increase the productivity of the process, in a rough gauge the ridge is rolled to a height of 0.5-0.7 the height of the ridge of the finished product when the length of the profile-forming ridge is equal to the length of the profile-forming ridge of the finished product, the profile is formed wavy, and in the finishing caliber the ridge is rolled to the final height dimensions due to stamping metal volume of the rim, a crest. 17 16 26 38 17 23 21 27 22 17 24 54 34 41 17 5 4 О О 1 2 4 7 3 О О about 2 The results of the quality control of bandages with the size of 686x566x104 mm according to GOST 20179-74 600x420x105 86 86 0.6 0.6 Compiled M. Avtoshin Editor A. Makovska Tehred MLidyk Order 3926/13 Circulation 572 VNIIPI of the State Committee for Inventions and Discoveries at G KIT USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Table 2 8 6 14 5 2 6 6 5 Proofreader N.Korol Subscription