SU1237289A1 - Arrangement for isothermal stamping - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used to obtain parts by stamping under isothermal conditions of especially large parts from hard-to-deformed, heat-resistant steels and alloys.

., The aim of the invention is to improve the quality of the products obtained by creating a uniform temperature field on the engraving tool.

FIG. 1 is a schematic diagram of the device; in fig. 2 and 3 are embodiments of a die die block; in fig. A is an embodiment of a die punch block. The device contains (Fig. 1) Poin's Sleep 1, a matrix 2, an induction heater |, a die unit 4 in which cavities 5 and 6 are made, with cavity 5 through the outlet 7 and pipeline 8 connected to a condenser 9, and the cavity 6 of the evaporator through the inlet 10 and the pipe 11 is connected to the tank 12. The capacitor 9 and the tank 12 are connected to each other by the pipe 13. The press is protected from heat by heat insulating gaskets 14.

The device for isothermal stamping works as follows.

The rotary position is placed between the punch 1 and the die 2, heated to the required temperature and deforms. The liquid refrigerant through the pipe 11 and the orifice 10 enters the evaporator cavity 6, where under the influence of the heat flow through the die 2 (the punch 1) to The evaporator cavity 6 is heated to the boiling point.

The resulting vapor with the boiling point of the refrigerant from the cavities 6 enters the cavity 5. As the cavities pass, 5 pairs, going towards the heat flow, heat up, absorbing heat from the walls of the cavities. Next, the steam enters the holes 7 and the pipe 8, through which it is fed into the condenser 9, where it passes into the liquid phase and is fed again through the pipe 13, the tank 12 and the pipe 11 in the evaporator cavity 6.

The heat flux, moving from the die (punch) to the evaporator, is divided into several parts. One part goes to evaporation, the other - to heat the steam, a third, overcoming the thermal resistance of the die block and heat insulating gaskets j goes to the heating of the press. The last part of the heat flux consists of various kinds of leaks. Heat balance can be expressed by the following formula:

five

Q where Q O + Q +

ISP

Qn,

THU

the total amount of heat flow, moving from the die (punch) to the evaporator; warm heat steam; warm, presa; Q - various kinds of heat leakage

Qn.ng Qnp, selected by the evaporator; spent on heating

spent on heating

The value of Qnp is constant since; The boiling point of the refrigerant is independent of temperature fluctuations. The size Q in each individual stamp is individual and depends on the design features of the stamp, thermal insulation, and at a given temperature the stamp of a certain design is approximately constant.

Irregularity of temperature .in the engraving and in the cuts of the die section depends on the heating conditions and heat leakage.

Maintaining a uniform temperature in the engraving and over the cross sections of the die unit is carried out as follows. If the matrix (punch) and the stamp block are divided by horizontal sections, then in known devices for isothermal stamping, the temperature at different parts of the engraving and each section of the stamp block has a significant difference. This causes a number of drawbacks, such as low precision when stamping low-access and non-seamless parts, the impossibility of obtaining a fine-grained and equiaxial structure, warping of parts during cooling, uneven stamp designs due to uneven heating of the punching devices in each section. Especially these shortcomings are found in devices for stamping large parts. Depending on the distance to the source of heat and the leakage of heat, different parts of the engraving, the stamp and the die block are heated unevenly. When the temperature rises by

one of the engraving sites, the heat flux in the direction of the underlying region of the cavities increases. In the cavity 5 pairs in this area selects

more heat than in neighboring areas; heat is more intensive in

Kakha with a lower temperature. It causes the evaporator to level up in the cavity 6 of the evaporator in the whole engraving and over the sections

this section of engraving due to the uve-die block.

 S77L-

/ L.

In the heat flux process, the conversion process is more intensive than in neighboring areas with lower temperatures. Therefore on this

L

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Editor I. Rybchenko

Compiled by "Beschekov"

Tehred V. Kadarcorrector E. Sirohman

Order 3226/10 Circulation 655Subscription

VNII1Sh State Committee of the USSR

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

Production and printing company, Uzhgorod, st. Project, 4

fieL

Claims (1)

DEVICE FOR ISOTHERMAL STAMPING, containing the upper and lower bases with deforming elements placed on them in the form of a punch and matrix having engravings, heating, sealing means and a system for removing heat from engravings of deforming elements in the form of channels filled with cooling liquid and made inside the said elements , characterized in that, in order to improve the quality of the products obtained by increasing the degree of uniformity of the temperature field on the engraving of the tool, it is equipped with a cooling supply system waiting fluid in the channels of the deforming elements, the removal of steam and its condensate, while the channels in the deforming elements are made of variable cross-section, are placed in the zones of the highest intensity of the heat flux. SU „„ 1237289 phases. 1