Sized forged pieces producing method and tool for performing the same

FIELD: plastic working of metals, namely manufacture of round cross section forged pieces from ingots and preliminarily deformed blanks in forging presses with four-striker forging devices.

SUBSTANCE: method comprises steps of hating ingot or blank and subjecting it to rough or sizing forging in four-striker forging device by the same strikers with concave curvilinear surfaces. When strikers are closed their concave surfaces form cylindrical cavity with relation of radius of concave curvilinear surface to circle radius inscribed into cavity formed by closed strikers in range 1.15 - 2.10. At rough forging process blank is subjected to single squeezing stages at deformation degree 18 - 70% while sustaining relation d1/d2 = 1.4 - 2.7 where d1 - mean diameter of ingot or blank; d2 - diameter of circle inscribed to cavity formed by closed strikers. At sizing forging process relation d3/d4 = 1.02 - 1.15 is sustained where d3 - diameter of blank after rough forging of it; d4 - diameter of sized forged piece.

EFFECT: reduced labor consumption of forging process, enhanced efficiency, less expenses for making tool.

3 cl, 4 dwg, 2 tbl

 

The invention relates to a pressure treatment of metals, in particular, to methods for producing forgings round cross-section of the ingots, continuous cast and pre-deformed billets for forging presses in chetyrehpostovyh forging devices, and the tools used in these devices.

The invention can be used in machine-building and metallurgical industry for the production of forgings round cross-section, including speed, structural, stainless, tool, high precision, heat-resistant and heat-resistant steels and alloys.

A known method of producing forgings for the device for forging blanks, including compression of the workpiece with the four sides of the flat strikers, filing and casting-off (see, for example, USSR author's certificate No. 1556804, CL 21 J 13/02, publ. in bull. Fig. No. 14, 1990). After forging in the device by means of special mechanisms connect the upper and lower jaunty, the whole structure rises, and thus, as the top striker is used in all further design of the device. The working part of such a firing pin serves as the reference surface of the device. This brisk produce forging or cutting of blanks.

This method does not ensure the production of high precision forgings, differs difficult is thew and high complexity.

There is also known a method of forging blanks and chetyrehballnoe forging device for its implementation (see, for example, patent of Ukraine No. 34978, class B 21 J 13/02, publ. in bull. izopet. No. 7 of 2003). 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. Rough forging this method produces strikers flat work surfaces, and calibrating forging - cut-out strikers.

The disadvantages of this method are the most labor intensive process because of the need to replace the heads with a flat work surface to cut Boiky or replacement of the forging device, the low performance of the forging process, as well as the high cost of manufacturing two sets of strikers or forging devices.

A well-known tool for radial forging, containing two pairs located in mutually perpendicular planes Boykov, the surface of the take-up reel and calibrating sections which form a closed path in the shape of AMBA (see, for example, USSR author's certificate No. 925510, class B 21 J 13/02, publ. in bull. Fig. No. 17, 1982).

This tool cannot provide a geometrically precise cylindrical forgings.

Also known tool for radial forging, containing two pairs located in mutually perpendicular planes of the heads having a working surface with the concave curved surfaces (see, for example, USSR author's certificate No. 1731396, class B 21 J 13/02, 1990).

Known tool does not provide the manufacturer of forgings of circular cross section in a wide range of diameters without changing the heads, thereby reducing the performance of the process, increasing its complexity and to the cost of the tool.

The basis of the invention is tasked by modifying the schema and modes of forging and design of the working surface of the tool to ensure the reduction of the complexity of the process and increasing its performance and reducing the cost of manufacture of the instrument or device.

This object is achieved in that in the method of obtaining calibrated forgings, including heating of the ingot or billet, rough forging and calibrating forging in chetyrehsetovom forging device strikers with the concave curved surfaces that form in the cloistered position of the cylindrical cavity, the supply and the AC is tion of the workpiece, what's new is that rough and calibrating forging perform the same strikers with the concave curved surfaces, while in the process of doing a rough forging carry out a single compression of the workpiece with the degree of deformation 18-70%, maintaining the ratio:

d1/d2=1,4-2,7,

where d1- the average diameter of the ingot or billet,

d2- the diameter of a circle inscribed in a cavity formed in the cloistered position Boykov and in the implementation of calibrating forging withstand value:

d3/d4=1,02-1,15,

where d3the diameter of the workpiece obtained after a rough forging,

d4- calibrated forgings.

The task is achieved by the fact that the instrument contains two pairs of identical Boykov, located in mutually perpendicular planes, with working parts with concave curved surfaces that form in close position the cavity, it is new that the ratio of the radius of the concave curved surface of the striker to the radius of the inscribed circle in the cavity formed when the closure Boykov, is 1,15-2,10.

Figure 1 shows jaunty 1-4 chetyrehvalkovoj forging device in close position; figure 2 - jaunty chetyrehvalkovoj forging device in the process of compression of the ingot (billet) when black is howling forging; figure 3 - jaunty forging device in the initial calibrating forging.

Patented a method of obtaining a calibrated forgings in chetyrehsetovom forging device is as follows.

In the working space of the hydraulic forging press set chetyrehballnoe forging device whose jaunty 1-4 have a concave curved surface, forming in close position the cylindrical cavity of diameter d2=2r2(figure 1).

The ratio of the radius of the concave curved surface striker r1the radius r2inscribed circle in the cavity formed when the closure Boykov, is:

r1/r2=1,15-2,10.

The source of the workpiece in the form of an ingot or pre-deformed billet round or polyhedral cross-section with an average diameter of d1heated in a furnace to a temperature forging, served with manipulator workspace chetyrehvalkovoj forging device and compresses it by strikers 1-4, while still rough forging (figure 2). In the process of doing a rough forging to produce a single compression of the workpiece with the degree of deformation 18-70%, which is calculated by the formula:

where d0- the original diameter of the workpiece in the deformation zone before compression,

d2/sub> the workpiece diameter after compression.

When the rough forging side surfaces of the heads of every single compression embedded in the body of the workpiece. After kantowski billet carry out the compression areas of the workpiece that is positioned between bonovymi surfaces adjacent the heads of the previous reductions. When forging ingot strikers with a curved concave surfaces, in which the relation r1/r2<1,15, you may receive sekulow on the surface of the workpiece.

When forging ingot strikers with a curved concave surfaces, for which the ratio of r1/r2>2,10 not provide geometrically precise cylindrical forgings.

When reductions with the degree of deformation less than 18% is not ensured high quality metal, and when the reductions to the degree of deformation of more than 70% of possible Sakova on the surface of the forgings.

Rough forging spend maintaining ratio:

d1/d2=1,4-2,7,

where d1- the average diameter of the ingot or billet,

d2- the diameter of a circle inscribed in a cavity formed in the cloistered position of the heads.

When the ratio of d1/d2<1,4 not provided the required quality metal forgings, and when the ratio of d1/d2>2,7 on the surface of the workpiece are formed Sakova.

After a rough forging receive the workpiece with a diameter of d3 that without additional heating compresses in the same set of strikers on the mode calibrating forging (figure 3). Compression carried out with the degree of deformation mainly 3-7%, with Kontokali and feeds the workpiece. While calibrating forging exercise, maintaining a ratio of:

d3/d4=1,02-1,15,

where d3the diameter of the workpiece obtained after a rough forging,

d4- calibrated forgings.

When the ratio of d3/d4<1,02 not provided the required geometric shape forgings and high precision.

When the ratio of d3/d4>1,15 significantly decreases the performance of the process.

The obtained calibrated the forging of round cross-section is passed to another press for trubky end parts, or cutting area.

Use one set of strikers for roughing and calibrating forging improves the performance of the process, to reduce the complexity of the process and cost of manufacturing tools or devices.

Example. Ingots weighing 5 tons with an average diameter of 580 mm of steel 40 GNMA heated to a temperature of 1180°and forged on the press force of 20 MN in chetyrehsetovom forging device according to the patented method and instrument for forging a diameter of 310 mm In chetyrehsetovom forging device, the operating surfaces of the heads were in the other curved surface, forming in close position all four of the heads of the cylindrical cavity, and it was sustained ratio:

r1/r2=1,5.

For comparison protovale ingot of the same weight in the method prototype. The forging results are presented in tables 1 and 2.

Analysis of the data given in tables 1 and 2 shows that the performance of the process of obtaining calibrated forgings for patentable method above 1.15-1.35 times than the performance of the process according to the method prototype, and the quality of the forgings is not inferior to the quality of forgings obtained in a known manner.

Table 1
no experienceTechnological parametersThe performance of process unitsNote
The degree of deformation, ε, %d1/d2d3/d4
1162,01,08-The quality of the metal does not correspond to GOST
2182,01,081,15
3402,01,081,20
4 702,01,081,35
5752,01,08-Sakova on the surface of the forgings
6401,31,08-The quality of the metal does not comply with the requirements of GOST
7401,41,081,27
8402,71,081,17
9402,81,08-Sakova on the surface of the forgings
10402,01,01-Forged polygonal cross-section
11402,01,021,30
12402,01,151,25
13402,01,160,95
14 prototype---1,00

That the face 2
no experienceTool optionsQuality forgings
r1/r2single.
11,10Sakova on the surface of the forgings
21,15Surface quality meets the requirements of GOST
31,40Surface quality meets the requirements of GOST
42,10Surface quality meets the requirements of GOST
52,2The surface of the forgings ribbed. Increased allowance for machining.

Thus, patent-pending method of obtaining calibrated forgings provides increased output by 15-35%, reduced complexity and reduced cost of manufacture of the tool.

1. The method of obtaining calibrated forgings, including heating of the ingot or billet, rough forging, calibrating forging in chetyrehsetovom forging device strikers with the concave curved surfaces forming in close position of the heads of the cylindrical cavity, the flow and the casting-off of the workpiece, characterized in that draft and calibrating forging perform the same strikers with concave to ivalentine surfaces, in the process of performing a rough forging carry out a single compression of the workpiece with the degree of deformation 18-70% and incubated ratio

d1/d2=1,4-2,7,

where d1- the average diameter of the ingot or billet;

d2- the diameter of a circle inscribed in a cavity formed in the cloistered position Boykov,

and in the implementation of calibrating forging withstand ratio

d3/d4=1,02-1,15,

where d3the diameter of the workpiece obtained after a rough forging;

d4- calibrated forgings.

2. Tool for obtaining calibrated forgings containing two are located in mutually perpendicular planes a pair of identical Boykov, with working parts with concave curved surfaces forming in close position the cavity, characterized in that the ratio of the radius of the concave curved surface of the striker to the radius of a circle inscribed in a cavity formed in the closure Boykov, is 1,15-2,10.



 

Same patents:

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1 tbl, 1 ex

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2 ex, 1 tbl

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

1 ex, 1 tbl

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EFFECT: improved efficiency and quality of forging, improved wear resistance of tools.

6 cl, 10 dwg, 1 ex, 3 tbl

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4 cl, 8 dwg, 3 ex

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