阅读说明：本技术 一种等温锻造加热炉 (Isothermal forging heating furnace ) 是由 朱敏鸿 唐军 雷媛 薛强 于 2019-12-06 设计创作，主要内容包括：本发明提供一种等温锻造加热炉。等温锻造加热炉包括：上炉和下炉,所述上炉和所述下炉之间存在由模具引起的空间；所述下炉包括：下炉外壁、下炉本体和保护套,所述保护套固定在所述下炉外壁的一圈,所述保护套环绕所述空间和所述上炉,所述空间、所述一圈保护套和所述上炉的上炉外壁之间空隙形成路径；使得所述上炉和所述下炉散失的热量沿着所述路径散失。(The invention provides an isothermal forging heating furnace. The isothermal forging heating furnace comprises: an upper furnace and a lower furnace, a space caused by a mold exists between the upper furnace and the lower furnace; the lower furnace comprises: the protective sleeve is fixed on one circle of the outer wall of the lower furnace, the protective sleeve surrounds the space and the upper furnace, and a path is formed among the space, the circle of protective sleeve and the outer wall of the upper furnace; so that the heat dissipated by the upper and lower furnaces is dissipated along the path.)

1. An isothermal forging furnace, comprising: an upper furnace and a lower furnace, a space caused by a mold exists between the upper furnace and the lower furnace; the lower furnace comprises: the protective sleeve is fixed on one circle of the outer wall of the lower furnace, the protective sleeve surrounds the space and the upper furnace, and a path is formed among the space, the circle of protective sleeve and the outer wall of the upper furnace; so that the heat dissipated by the upper and lower furnaces is dissipated along the path.

2. The isothermal forging furnace of claim 1, wherein the protective sleeve is fixed to the periphery of the upper end surface of the outer wall of the lower furnace.

3. The isothermal forging furnace of claim 1, wherein the protective sheath has a height greater than a maximum height of a forging forged by the die.

4. The isothermal forging furnace of claim 1, wherein the protective sheath comprises: the heat insulation device comprises a closed heat insulation shell and heat insulation cotton arranged in an inner cavity of the heat insulation shell.

Technical Field

The invention belongs to the technical field of forging heating, and particularly relates to an isothermal forging heating furnace.

Background

Isothermal forging requires a matched heating furnace to provide required heat, and the heating furnace is of an up-and-down heating structure. Firstly, isothermal forging, wherein an upper furnace and an upper die are fixed on an upper workbench of equipment, the upper workbench of the equipment moves downwards during working, the upper die and the upper furnace move downwards along with the upper die, a forged workpiece is arranged in a cavity of a lower die, the lower furnace and the lower die are fixed on the lower workbench of the equipment and cannot move, after the upper die is contacted with a forge piece, the operating speed of the upper workbench is obviously reduced, and the upper die and the lower die start to work until the forge piece is forged.

Disclosure of Invention

The present invention is designed in view of the above-described state of the art, and provides an isothermal forging furnace that can reduce heat loss.

The purpose of the invention is realized by the following technical method:

in a first aspect, there is provided an isothermal forging furnace comprising: an upper furnace and a lower furnace, a space caused by a mold exists between the upper furnace and the lower furnace; the lower furnace comprises: the protective sleeve is fixed on one circle of the outer wall of the lower furnace, the protective sleeve surrounds the space and the upper furnace, and a path is formed among the space, the circle of protective sleeve and the outer wall of the upper furnace; so that the heat dissipated by the upper and lower furnaces is dissipated along the path.

Further, the protective sheath is fixed in the periphery of the upper end face of the outer wall of the lower furnace.

Further, the height of the protective sleeve is larger than the maximum height of the forge piece forged by the die.

Further, the protective sheath includes: the heat insulation device comprises a closed heat insulation shell and heat insulation cotton arranged in an inner cavity of the heat insulation shell.

The invention has the beneficial effects that: when various large isothermal forging heating processes, the isothermal forging heating furnace for heating the upper and lower structures is improved, so that the heat loss between the heating furnaces during forging is reduced, the heat required during isothermal forging is ensured, and the problem of heat loss caused by the gap at the joint surface of the upper and lower furnaces is solved. The novel mode of adding the protective sleeve at the lower furnace better ensures the heating of isothermal forging, meets the technological requirements of isothermal forging of products, meets the performance requirements of isothermal forgings, realizes the forming rate of the forgings, improves the productivity, reduces the production cost

Drawings

FIG. 1 is a schematic structural view of an isothermal forging furnace according to an embodiment of the present invention.

Fig. 2 is a schematic view of a heat-resistant protective sheath according to an embodiment of the present invention.

FIG. 3 is a schematic view of the starting state of isothermal forging according to an embodiment of the present invention.

Detailed Description

The embodiment provides an isothermal forging heating furnace, and the mode that isothermal forging is carried out to this lower furnace body plus protective sheath is new structural style, realizes isothermal forging's heating better, satisfies product isothermal forging's technical requirement.

For isothermal forging, special equipment with isothermal forging performance (hereinafter referred to as isothermal forging equipment) is used for processing, and isothermal forging of powder disc products of our company is completed on ten thousand-ton oil press equipment. In isothermal forging, as shown in fig. 1, upper and lower dies (9, 10) are mounted between upper and lower tables (1, 2) of the apparatus, and a heating furnace is a vertical heating structure for heating the dies. The upper furnace (3) is connected with the upper workbench (1) of the device through a T-shaped bolt (5), a nut (7) and a gasket (8), and the upper furnace (3) moves up and down in a protective sleeve (11) of the lower furnace (4) during forging, so that the heat loss of a die and a forge piece during forging is reduced, the finish forging temperature of a product during isothermal forging is ensured, and the smooth operation of the isothermal forging is ensured.

Isothermal forging is performed on an isothermal forging apparatus. For example, a ten thousand ton oil press device, an upper die and a lower die are arranged between an upper working table and a lower working table of the device. And determining the height of the heat-resistant protective sleeve of the lower furnace body and the clearance delta between the protective sleeve and the upper furnace according to the closing height of the upper and lower dies, the deformation of the forge piece, the height of the heated part of the heating furnace and the running distance of the equipment workbench. The heat-resistant protective sleeve is manufactured according to the work shown in the figure 2, the protective sleeve 11 in the figure is formed into the inner diameter phi 1 of the protective sleeve according to the outer diameter +50mm (a gap of 25mm is formed at the half edge) of an upper furnace, the outer diameter phi 2 (phi 1+100) of the protective sleeve is obtained according to the strength and experience, the height H1 of the protective sleeve is determined according to the deformation height of a forge piece, the inner diameter and the outer diameter of the protective sleeve are made of stainless steel 1Cr18Ni9Ti with the diameter of tau being 3mm, the protective sleeve is welded on a bottom plate 12, heat preservation cotton is filled in the hollow part of the protective sleeve, and the protective sleeve is welded on a lower furnace body after.

The mode of adding the protective sleeve under the isothermal forging meets the technical requirements of the product during isothermal forging.

In the whole forging process, a gap is always reserved between the upper die and the lower die, and the size of the gap is gradually reduced along with the beginning of the deformation of the forge piece until the deformation of the forge piece is reduced to zero. The existence of the clearance inevitably causes a great loss of heat on the surface of the product during the isothermal forging of the equipment, and the heat loss condition can be obtained through calculation:

taking isothermal forging of a powder disc as an example, the outer diameter phi of a heating furnace is 2660mm, the deformation amount of a forge piece is 200mm, the forging time delta T is 40min, the forging temperature T is 1070 ℃, and the space chamber temperature Ts is 25 DEG C

Loss of heat at the junction of the upper and lower furnaces

WhereinThe emissivity coefficient is 0.68 (obtained by table lookup), A is the opening area of the upper furnace and the lower furnace

The solution is that a heat-resistant (thermal deformation prevention) insulating sleeve is arranged on a lower furnace structure, a forge piece in a die is highly and completely closed, the heat dissipation area during isothermal forging is reduced, and the heat dissipation at the position is calculated as

The heat dissipation gap is 25mm, and the values of the other parameters are the same as above.

Through calculation, after the heat-resistant protective sleeve is added, the isothermal forging heat loss at the joint of the upper furnace and the lower furnace is greatly reduced, and only less than 6% of heat is lost, so that the heat loss caused by gaps at the position is powerfully reduced, the finish forging temperature of the isothermal forging forge piece is ensured, and the forming of the forge piece is facilitated. The invention relates to a mode of adding a protective sleeve on a lower furnace structure for isothermal forging, which solves the problem of heat loss caused by a gap between a combining surface of an upper furnace and a lower furnace during forging and ensures the smooth operation of isothermal forging.

Therefore, for the isothermal forging heating furnace with the upper and lower structures for heating, the lower furnace is provided with a heat-resistant insulating sleeve, so that the problem of heat loss caused by a gap at the position of the joint surface of the upper and lower furnaces during forging is solved. The scheme provides a method for reducing heat loss between isothermal forging heating furnaces with upper and lower structure heating.

The technical scheme of the invention is further detailed in the following with reference to the attached drawings:

when isothermal forging is started, as shown in fig. 3, an upper furnace (3) is fixed on a workbench of equipment through a connecting bolt (4), after an isothermal forging (8) is placed into a lower die (6), the upper workbench (1) of the equipment descends, an upper die (2) and the upper furnace (3) operate downwards along with the upper furnace, the upper furnace (3) firstly enters a protective sleeve (11) in the descending process of the upper workbench (1), at the moment, the upper die (2) is not in contact with the forging (8), the upper workbench (1) continues to descend, at the moment, the upper die is in contact with the forging to perform isothermal forging until the isothermal forging is formed, and the forming process lasts for a long time. Therefore, by adding the protective sleeve in the heating furnace, the problem of heat loss caused by the gap at the joint surface of the upper furnace and the lower furnace is solved, the finish forging temperature, particularly the surface temperature of the isothermal forging is ensured, and the process requirement of isothermal forging of products is met. After the forged piece is formed, the upper workbench (1) moves upwards to drive the upper die (2) to be separated from the forged piece (8), at the moment, the upper furnace (3) and the lower furnace (5) are not completely separated, but move upwards for a section in the protective sleeve, continue to move for an idle stroke until the upper furnace and the lower furnace are completely separated from the protective sleeve, and at the moment, finish an isothermal forging process.

The mode of adding the heat-resistant protective sleeve to the lower furnace is adopted in various isothermal forging such as powder tray products, 31-frame products, case products, aluminum beam frame products and the like in our company, the effect is quite good, and the effect of reducing the heat loss of the gap at the joint surface of the upper furnace and the lower furnace is achieved.

The mode of adding the heat-resistant protective sleeve to the isothermal forging lower furnace solves the problem of heat loss caused by the gap at the joint surface of the upper furnace and the lower furnace, and meets the technical requirements of products during isothermal forging.