CN205217907U - A cabinet -type electric furnace for isothermal forging - Google Patents

Abstract

The utility model relates to a box-type electric furnace for isothermal forging, comprising a box body with a furnace door, the inner wall of the box body is provided with a refractory layer and a resistance heating element, and the box body is equipped with at least part of forging equipment and at least For the furnace of two workpieces, the top of the box is provided with an upper through hole that can be passed by the lifting mechanism to drive part of the forging equipment in the furnace to move, and a heat insulation hole that cooperates with the lifting mechanism and closes the upper through hole. layer, and the bottom of the box is also provided with a lower through hole adapted to the supporting structure of some forging equipment. The structure of the box-type electric furnace is simple, there is no need to cut off the power when it is used, and it is safe. It can continuously heat the mold and multiple workpieces. It has high production efficiency and good heating effect, and can keep the mold and the workpieces constant. Forging is carried out in the furnace at the forging temperature to improve the forging quality and ensure the metallographic structure and mechanical properties of the product to the greatest extent.

Description

Electric box furnace for isothermal forging

technical field

The utility model relates to a box-type electric furnace used for isothermal forging, in particular to an electric furnace which is especially suitable for simultaneous heating and isothermal forging of a plurality of workpieces to be processed.

Background technique

Isothermal forging is to control the temperature of the mold in the same range as the temperature of the workpiece, so that the workpiece can complete the forming process under the condition that the temperature is basically constant. Only the furnace door can be opened and closed in the traditional box-type electric furnace. If the mold and the workpiece are put into the furnace, and then taken out and sent to the forging press when they are warm, this is impossible for the structure of the traditional box-type electric furnace. Therefore, at present, the coil of the intermediate frequency or high frequency generator is used to heat the mold. The coil is still set outside the mold and the workpiece during forging and forming. For safety reasons, the power supply of the electric furnace should be disconnected during the forging process and when taking parts. , At this time, the temperature of the mold also drops. When the second workpiece is installed, restart the power supply to start heating the mold and the second workpiece. In this way, not only the efficiency is low, but also the temperature is unstable during forging, which has a great influence on the product quality. Especially in the forging of titanium or titanium alloy parts, because titanium or titanium alloy is very sensitive to temperature, once the temperature of the processed part of titanium or titanium alloy drops, or the temperature between the mold and the processed Large differences will lead to uneven product organization after processing.

In practical applications, for workpieces of different sizes and shapes, the coils used by intermediate frequency and high frequency heaters are also different, so it is necessary to equip special coils according to the shape and size of workpieces. In the long run, there will be a lot of coil backlogs, which will increase virtually. costs.

Utility model content

The technical problem to be solved by the utility model is to provide a simple structure, good heating effect, and can make the mold and the workpiece to be forged at a constant forging temperature, so as to improve the forging quality, and ensure the metallographic structure and structure of the product to the greatest extent. mechanical properties.

The utility model is a box-type electric furnace for isothermal forging, which includes a box body with a furnace door, the inner wall of the box body is provided with a refractory layer and a resistance heating element, and there are at least part of the forging equipment and at least two quilts in the box body. For the furnace of the workpiece, the top of the box is provided with an upper through hole that can be passed by the lifting mechanism to drive part of the forging equipment in the furnace to move, and a heat insulation layer that cooperates with the lifting mechanism and closes the upper through hole. The bottom of the body is also provided with a lower through hole adapted to the supporting structure of part of the forging equipment.

Wherein, the part of the forging equipment may be an upper mold and a lower mold matched with each other. In actual use, the upper mold, lower mold and workpiece for forging can be placed in the furnace first, and the lifting mechanism is connected with the upper mold. The supporting structure is used to support the lower mold, and the upper mold and the lower mold The positions of the molds can be corresponding. Heat is generated when electric current passes through the resistance heating element, and then the upper mold, the lower mold and the workpiece are heated through heat conduction, convection, and radiation. Since the resistance heating element is set on the inner wall of the box, there is enough space in the furnace to place multiple workpieces, that is, in addition to heating the workpiece to be forged and its upper and lower molds, other multiple workpieces can also be heated. The workpieces to be processed are preheated in the furnace at the same time, which saves energy. The upper through hole can make the lifting mechanism drive the upper mold to move up and down, and play the role of mold clamping and mold splitting, so that the workpiece can be directly forged after being heated in the furnace. During the whole work, there is no need to cut off the power, and the heating and forging links can be carried out continuously in the furnace, which has high production efficiency and can greatly save production costs; at the same time, the workpiece, upper die and lower die can be forged After the temperature is constant, the metallographic structure and shape of the product after forging fully meet the design requirements, and the mechanical properties of the product are also good. The heat insulation layer can play the role of sealing the upper through hole for heat insulation, and can prevent heat from leaking from the gap between the lifting mechanism and the upper through hole, ensuring the safety of use, and the box body with better sealing performance It can better keep heat and improve the heating effect of the box-type electric furnace.

Since the lower through hole is compatible with the supporting structure of the lower mold, it can prevent the heat in the furnace from leaking out to a certain extent, but in order to further strengthen the sealing of the box and improve the safety of use, the bottom of the box is still Preferably, a thermal insulation structure is provided to close the lower through hole and connect with the supporting structure. In addition, the support structure can also be set in an inverted T-shaped structure, so that the lower through hole can be closed by the support structure itself, avoiding heat leakage, ensuring better sealing of the box, and improving the safety of use.

Preferably, the heat insulation structure may be an existing asbestos heat insulation board and/or a water cooling board. The asbestos heat insulation board has a good heat insulation effect, and the water cooling plate can play a cooling effect. Both of them can make the box-type electric furnace of the present application better heat preservation and improve the heating effect while protecting the box body.

In practical applications, the heat insulation structure may also be connected with a lower workbench for load bearing. The lifting mechanism includes a lifting rod that can pass through the upper through hole, and an upper worktable that controls the movement of the lifting rod. In order to simplify the structure, the upper workbench and the lower workbench can be the upper and lower workbenches of the press, so that the lower mold and the upper mold in the furnace are connected to the press respectively indirectly. When the workpiece reaches the forging temperature , can be forged immediately, more convenient for actual operation, and conducive to improving production efficiency, and is especially suitable for isothermal forging of processed parts (such as titanium or titanium alloy parts) that are very sensitive to temperature changes, ensuring better product quality after forging .

Preferably, a heat insulation layer is provided between the lifting rod and the upper worktable to avoid damage to the press outside the box-type electric furnace due to excessive temperature. The heat insulation layer is preferably an asbestos heat insulation board.

Further, the resistance heating element is a resistance wire, a silicon carbide rod or a silicon molybdenum rod. The refractory layer is refractory bricks, and the refractory bricks can keep the box-type electric furnace of the present application warm and protect the box body at the same time. In order to further simplify the structure, the resistance wire can also be set in the groove of the refractory brick to achieve a comprehensive heating effect.

Further, the box body is also provided with observation holes and thermocouple holes. The thermocouple hole can be used to install a thermocouple, which is convenient for accurate temperature detection.

The utility model is a box-type electric furnace used for isothermal forging. Both the workpiece and the workpiece are forged in the furnace at a constant forging temperature to improve the forging quality and ensure the metallographic structure and mechanical properties of the product to the greatest extent.

The above-mentioned content of the present utility model will be further described in detail below in conjunction with the specific implementation manners of the examples. However, it should not be understood that the scope of the above-mentioned subject matter of the present utility model is limited to the following examples. Without departing from the above-mentioned technical idea of the present utility model, various replacements or changes made according to ordinary technical knowledge and conventional means in the field shall be included in the scope of the present utility model.

Description of drawings

Fig. 1 is a structural schematic diagram of a box-type electric furnace for isothermal forging of the present invention.

detailed description

The box-type electric furnace for isothermal forging as shown in Figure 1 includes a box body 3 with a furnace door, the inner wall of the box body 3 is provided with a refractory layer and a resistance heating element, and there is an upper mold that can be placed in the box body 3 11. The lower mold 12 and the furnace 4 of a plurality of workpieces. The top of the box body 3 is provided with an upper through hole 10 that can be passed by the lifting mechanism to drive the upper mold 11 in the furnace 4 to move, and is matched with the lifting mechanism. Combined with the asbestos heat insulation board 2 that closes the upper through hole 10 , the bottom of the box body 3 is also provided with a lower through hole 13 that is compatible with the supporting structure 14 of the lower mold 12 .

The bottom of the box body 3 is also provided with a heat insulation structure that closes the lower through hole 13 and is connected with the support structure 14, which protects the box body 3 while making the box-type electric furnace of the present application better insulated and improves the heating effect . The heat insulation structure may be an asbestos heat insulation board 2 and a water cooling board 7 arranged in sequence from top to bottom. The water-cooled plate 7 is also connected to the lower worktable 8, and the lifting mechanism includes a lifting rod 9 that can pass through the upper through hole 10, and an upper working table 1 that controls the movement of the lifting rod 9. The upper workbench 1 and the lower workbench 8 can be the workbenches of a press for forging, so that the lower die 12 and the upper die 11 in the furnace 4 are connected to the press respectively indirectly, so that they can be easily installed in the furnace 4. directly for forging. The support structure 14 may be a connecting rod similar to the lifting rod 9 . An asbestos heat insulation board 2 is arranged between the elevating rod 9 and the upper workbench 1 to avoid damage to the press outside the box-type electric furnace due to excessive temperature.

Under the effect of the asbestos heat insulation board 2, the sealing performance of the box body 3 is better, the safety and reliability are good, the heat preservation effect is good, and it is beneficial to improve the heating effect of the electric furnace.

The resistance heating element is a resistance wire 6 , and the refractory layer is a refractory brick 5 . The refractory brick 5 can keep the box-type electric furnace of the present application insulated, and can protect the box body 3 at the same time. The resistance wire 6 is preferably fixed in the groove of the refractory brick 5 on the inner side wall of the box body 3 to achieve a comprehensive heating effect.

The box body 3 is also provided with observation holes and thermocouple holes (not shown). The thermocouple hole can be used to install a thermocouple, which is convenient for accurate temperature detection.

In actual use, first open the furnace door (not shown), place the upper mold 11, lower mold 12 and workpiece (not shown) for forging in the furnace 4, close the furnace door, and use electric current to pass through the When the resistance wire 6 generates heat, the upper mold 11, the lower mold 12 and the workpiece are heated through heat conduction, convection, and radiation.

Since the resistance wire 6 is fixed in the groove of the refractory brick 5, there is enough space to place a plurality of workpieces in the furnace 4, that is, in addition to heating the workpiece to be forged and its upper die 11 and lower die 12, also Multiple other workpieces can be preheated in the furnace 4 at the same time to save energy, and it is especially suitable for heating smaller workpieces (for example, titanium alloy golf head pieces). When the workpiece reaches the forging temperature, its temperature remains basically unchanged, and the temperature of the upper mold 11 and the lower mold 12 is always the same. At this time, the movement of the lifting rod 9 is controlled by the upper worktable 1, and the upper mold 11 is driven downward. movement, so as to directly carry out isothermal forging on the workpiece in the furnace 4. During the whole work, there is no need to cut off the power, the heating link and the forging link can be continuously carried out in the furnace 4, the production efficiency is high, and the production cost can be greatly saved; at the same time, the workpiece, the upper mold 11 and the lower mold 12 After reaching the forging temperature, it remains constant. The metallographic structure and mechanical properties of the forged product meet the requirements, and the shape of the product fully meets the design requirements. It is especially suitable for processed parts that are sensitive to temperature changes (such as titanium alloy golf balls) pieces) for isothermal forging.

Claims (10)

1. for the cabinet-type electric furnace of isothermal forging, comprise the casing (3) being provided with fire door, it is characterized in that the inwall of described casing (3) is provided with flame retardant coating and resistance heating element, having in casing (3) can the burner hearth (4) of at least placement part forging equipment and at least two work pieces, the top of casing (3) is provided with can for the upper through hole (10) of elevating mechanism through the part forging equipment motion in rear drive burner hearth (4), and match to merge with described elevating mechanism and close the thermal insulation layer of described upper through hole (10), the bottom of casing (3) is also provided with the lower through-hole (13) adapted with the supporting structure of part forging equipment (14).

2., as claimed in claim 1 for the cabinet-type electric furnace of isothermal forging, it is characterized in that the bottom of casing (3) is also provided with closed described lower through-hole (13) and the heat insulation structural be connected with described supporting structure (14).

3., as claimed in claim 2 for the cabinet-type electric furnace of isothermal forging, it is characterized in that described heat insulation structural is asbestos insulation plate (2) and/or cooled plate (7).

4., as claimed in claim 2 for the cabinet-type electric furnace of isothermal forging, it is characterized in that described heat insulation structural is connected with lower table (8).

5. as claimed in claim 1 for the cabinet-type electric furnace of isothermal forging, it is characterized in that elevating mechanism comprises can through the elevating lever (9) of upper through hole (10), and controls the upper table (1) that described elevating lever (9) moves.

6., as claimed in claim 5 for the cabinet-type electric furnace of isothermal forging, it is characterized in that being provided with thermal insulation layer between elevating lever (9) and upper table (1).

7., as claimed in claim 1 for the cabinet-type electric furnace of isothermal forging, it is characterized in that described resistance heating element is resistance wire (6).

8., as claimed in claim 1 for the cabinet-type electric furnace of isothermal forging, it is characterized in that described flame retardant coating is refractory brick (5).

9. the cabinet-type electric furnace for isothermal forging as described in one of claim 1 to 8, is characterized in that described thermal insulation layer is asbestos insulation plate (2).

10. the cabinet-type electric furnace for isothermal forging as described in one of claim 1 to 8, is characterized in that described casing (3) is also provided with peep hole and thermocouple hole.