Billet forging method in four-striker forging apparatus

FIELD: plastic working of metals, namely methods for producing forged products with elongated axis from ingots and preliminarily deformed billets in forging presses of four-striker forging apparatuses.

SUBSTANCE: method comprises steps of squeezing billet at four sides, feeding it and tilting; changing feed value of billet after each pass (increasing or decreasing it). Forging operation during odd passes beginning from first one is realized at percentage feed value exceeding that of even passes at satisfying next relations: S1 /h1 = 1.2 - 6.5; S2/h2 = 0.5 - 1.1, where S1,S2 - absolute feed value of blank for odd and even passes respectively; h1, h2 - size of cross section area of blank before squeezing it during odd and even passes respectively.

EFFECT: enhanced quality of metal, increased efficiency of forging.

1 ex, 1 tbl

 

The invention relates to the processing of metals by pressure, in particular a process for the production of forgings with a long axis of ingots, continuous cast and pre-deformed workpieces on machines in chetyrehpostovyh forging devices.

It can be used in machine-building and metallurgical industries in the manufacture of forgings and objects of round, square, rectangular and other cross-sections of structural steel, stainless, tool, high precision, heat-resistant and heat-resistant steels and alloys.

There is a method of forging blanks in chetyrehsetovom forging device (see, for example, USSR author's certificate No. 1407639, CL 21 J 5/00, publ. Bull. Fig. No. 25, 1988), in which one pair of strikers carry only radial compression of the workpiece with shifts of the heads simultaneously toward each other and to the same firing another pair. Kantowski workpiece to perform the combining sites, objetych one pair of strikers with the other pair of strikers.

The above method of forging allows you to get the forging of a higher quality metal than with the methods of forging, based on the four-way radial reductions.

However, in the forging of the above known method is not achieved sufficiently intense deformation study of art is ucture metal, not ensured high productivity of the process and high precision forgings.

There is also known a method of forging blanks and chetyrehballnoe forging device for its implementation (see, for example, patent of Ukraine No. 34978 And 15. 03.2001,, MKI B 21 J 1/04, B 21 J 13/02, publ. in bull. izopet. No. 2, 15.03.2001,). In this way the forging is carried out in three stages: basic, intermediate, and final. At the same time on the main stage compression is performed with the introduction of the side surfaces of the heads in the body of the workpiece. At the primary and intermediate stages perform rough forging, and at the final stage - calibrating forging, which align (calibrate) the surface of the workpiece, thus obtaining the desired geometrical shape forgings with accurate dimensions.

There is a method of forging chetyrehsetovom forging device ensures forgings with minimal tolerances and high surface quality.

However, a significant drawback of this method is that it does not provide a high quality metal, and not to achieve high performance of the forging process.

The basis of the invention is tasked by changing modes of forging to obtain a high quality metal forgings and improving the performance of the forging process.

This object is achieved in that the method of forging blanks in chetyrehsetovom forging device for forging press, includes compression on all four sides, filing and kantowski workpiece, what's new is that in the process of forging relative to the workpiece periodically, after each pass, change in size, then increasing, then decreasing it, while forging odd passages, starting with the first, produced with relative feed rates greater than even the aisles, and kept ratio:

s1/h1=1,2-6,5

s2/h2=0,5-1,1,

where s1, s2- absolute workpiece on odd and even passages, respectively;

h1h2the cross - sectional dimension of the workpiece prior to its compression at the odd-numbered and even-numbered passages, respectively.

The method of forging blanks in chetyrehsetovom forging device, which is patented, is as follows.

The source of the workpiece in the form of an ingot or pre-deformed billet round, square or many-sided cross-section is heated in a furnace to a temperature forging, served with manipulator workspace chetyrehvalkovoj forging devices mounted on the table, hydraulic forging press, and do a craft with feed and Kontokali of the workpiece. In the forging process relative to the workpieceperiodically, after each pass, change led by the office, then increasing, then decreasing it, while forging odd passages, starting with the first, produced with relative feed rates greater than even the aisles.

In the implementation process of forging odd passages with large relative feed (ν1=1,2-6,5) is intense deformation study of metal in the surface zone of the workpiece, and when crafting with relatively lower feed (ν2=0,5-1,1) on even the aisles - intensive deformation study of the metal in the Central zone of the workpiece. In addition, the odd-numbered passages, when crafting with large relative feed the workpiece is given a special cross-sectional shape, the compression of which even the aisles with small relative feed maximum effect study of the metal structure in the axial zone.

Set in the aisles of the relative feeding of the workpiece increase productivity and the quality of the metal.

When the relative supply of s1/h1less than 1.2 dramatically decreases the performance of the process. When values of s1/h1more than 6.5 greatly increased lateral broadening, which also reduces the efficiency of the process and also increases the required effort at forging.

When s2/h2less than 0.5 considerably reduces proizvoditelnosti, and when values of s2/h2more than 1.1 deteriorates the quality of the metal.

Example

Ingot weight 115 kg of steel R6M5 with an average diameter of 175 mm was heated to a temperature of 1150°and forged in chetyrehsetovom forging device for hydraulic forging press force of 5 MN to the forging of round cross-section with a diameter of 95 mm

First odouli the pin from the side of the head part of the ingot, and then the ingot was heated, seized the trunnion arm and protovale 8 passes on the diameter 95 mm Time forging ingot was 344 C. After this, the workpieces are conveyed to the cutting machine, which cut off the bottom and the head part, and a sample for research quality metal. Received forgings and the sample was put in a furnace for heat treatment and perform the heat treatment. Research quality metal showed carbide inhomogeneity corresponded to 5 points.

For comparison, the prototype method has protovale the same ingot of steel R6M5 on the forging of a diameter of 95 mm

Time forging ingot amounted to 416, and carbide inhomogeneity corresponded to 6 points.

Thus, when using the proposed method of forging improving the performance of the process was 17.3%, and the metal quality is improved.

Table 1 presents data on the forging of ingots weighing 115 kg of steel R6M5 in chetyrehsetovom forging device for hidraulicas the om forging press force of 5 MN by the present method (experiments No. 1-5) and the prototype method (experiment No. 6). In the process of forging has been forged with a diameter of 95 mm

Table 1
no experienceTechnological parametersThe results of the testsNote
Relates. submission on odd. the aisles, s1/h1single.Relates. feed on even the aisles, s2/h2single.The time of forging,Score carbide inhomogeneity, one.
10,8-1,10,8-0,95
22,5-5,20,8-0,93445
36,6-7,00,8-0,94385The effort of forging led. up to Max. doPost. at this press
42,5-5,20,3-0,44205
52,5-5,21,2-1,33306
6

(prototype)
--4166

Thus, when using the proposed method of forging produces alnost process is increased by 17.3%, and the quality of the metal is improved by reducing carbide inhomogeneity on 1 point.

The method of forging blanks in chetyrehsetovom forging device for forging press including a compression on all four sides, filing and kantowski workpiece, characterized in that the forging process relative to the workpiece periodically after each pass, change in the size of its increase and decrease, while forging odd passages, starting with the first, produced with relative feed rates greater than even the aisles, as well as withstand ratio

s1/h1=1,2-6,5;

s2/h2=0,5-1,1,

where s1, s2- absolute workpiece on odd and even passages, respectively;

h1h2the cross - sectional dimension of the workpiece prior to its compression at the odd-numbered and even-numbered passages, respectively.



 

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