Hot press furnace

Abstract

A hot pressing furnace is used for heat-treating at least one workpiece; it includes a hot pressing furnace body and a heating element located within the hot pressing furnace body; the hot pressing furnace body has a heat-treatment chamber, and the heating element generates heat to heat-treat the workpiece; the hot pressing furnace further includes: a first pressing head, the first pressing head is located within the heat-treatment chamber; the first pressing head presses against one surface of the workpiece; a first press, the first pressing head is arranged on the first press, the first press is located outside the hot pressing furnace body and is used to drive the first pressing head to reciprocate within the heat-treatment chamber; and a control system, the control system controls the movement of the first press. The hot pressing furnace provided by the present invention can solve the pressurization problem during the heat-treatment process.

Description

Technical Field

[0001] The present invention relates to a hot pressing furnace. Background Art

[0002] In the process of manufacturing many products, heat treatment of materials is required. If pressure can be applied to increase the density of workpieces during heat treatment, it is of great significance for improving the performance of graphite materials and powder metallurgy workpieces. However, in the prior art, it is not easy to achieve high temperature and high pressure, and it is even more difficult to have equipment with both high temperature and high pressure. Summary of the Invention

[0003] In view of this, the present invention provides a hot pressing furnace that can solve the pressure application problem during heat treatment.

[0004] A hot pressing furnace for heat treating at least one workpiece; comprising a hot pressing furnace main body and a heating element located within the hot pressing furnace main body; the hot pressing furnace main body has a heat treatment chamber, and the heating element generates heat to heat treat the workpiece; the hot pressing furnace further comprises: a first pressing head located within the heat treatment chamber; the first pressing head presses against one surface of the workpiece; a first press, the first pressing head is disposed on the first press, and the first press is located outside the hot pressing furnace main body and is used to drive the first pressing head to reciprocate within the heat treatment chamber; and a control system that controls the movement of the first press.

[0005] Further, the hot pressing furnace main body further has a heating-up chamber and a cooling-down chamber, and the heat treatment chamber is located between the heating-up chamber and the cooling-down chamber; inert gas is passed through the heating-up chamber, the heat treatment chamber, and the cooling-down chamber.

[0006] Further, the heating-up chamber uses one of eddy current heating, resistance heating, and combustible material heating for heating; the heat treatment chamber uses at least two of eddy current heating, resistance heating, and combustible material heating for combined heating; a cooling assembly is disposed within the cooling-down chamber.

[0007] Further, the hot pressing furnace main body includes a housing that forms the heat treatment chamber; the housing includes a protective layer and a heat insulation layer, the protective layer surrounds the heat insulation layer, and the heat insulation layer encloses the heat treatment chamber; the housing has a first opening, and the first pressing head enters the heat treatment chamber through the first opening, and a first sealing member is formed between the first opening and the first pressing head.

[0008] Further, the hot press furnace further includes a second pressing head and a second press; the second pressing head is located in the heat treatment chamber, and the first pressing head and the second pressing head respectively press against opposite two surfaces of the workpiece; the second pressing head is disposed on the second press; the second press is located outside the hot press furnace main body and is configured to drive the second pressing head to reciprocate in the heat treatment chamber.

[0009] Further, the housing further has a second opening, and the second pressing head enters the heat treatment chamber through the second opening; a second sealing member is formed between the second opening and the second pressing head.

[0010] Further, the heating mode of the heating element is eddy current heating; the eddy current heating is performed by a coil, the coil is in a spiral shape and is buried in the heat preservation layer; the coil surrounds and induces the workpiece to form an electromagnetic field, thereby causing the workpiece to heat up.

[0011] Further, the coil is made of artificial carbon material.

[0012] Further, the heating mode of the heating element is resistance heating; the hot press furnace further includes a power supply, the power supply is electrically connected to the first pressing head and the second pressing head respectively, both the first pressing head and the second pressing head are graphite pressing heads, and the first pressing head, the workpiece and the second pressing head are connected in series.

[0013] Further, a secondary reaction chamber is further disposed inside the heat preservation layer, and the secondary reaction chamber is used as a reaction chamber for a secondary reaction.

[0014] The hot press furnace provided by the present invention: 1) By providing at least one pressing head and a press for controlling the movement of the pressing head and applying pressure to the pressing head, the workpiece can be pressurized while undergoing heat treatment, so that the workpiece can be formed into shapes such as film-like, block-like, plate-like, etc.; 2) By providing two pressing heads and two presses, the hot pressing process of the workpiece can be carried out continuously; the two pressing heads and the two presses cooperate with the heating chamber, the heat treatment chamber and the cooling chamber, so that the heat treatment of the workpiece can be carried out in stages, thereby protecting the pressing head and the workpiece; in this way, through the repeated movement of the pressing head, the workpieces are arranged in sequence to reach the high-temperature area to complete the heat treatment, and a continuous high-temperature hot press furnace can be formed; 3) By opening up a space in the heat preservation layer as a reaction chamber for a secondary reaction, the heat generated by the hot press furnace can be fully utilized to heat-treat the reactants of the secondary reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a hot press furnace provided for a preferred embodiment of the present invention.

[0016] MAIN ELEMENT SYMBOL DESCRIPTION

[0017]

[0018]

[0019] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0020] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following will describe in detail the specific embodiments, structures, features and effects of the hot pressing furnace provided by the present invention in conjunction with the attached Figure 1 and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present at the same time. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there may be an intermediate element present at the same time.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] Please refer to Figure 1 , the present invention provides a hot pressing furnace 100, and the hot pressing furnace is a high-temperature hot pressing furnace. Here, "high temperature" means that the maximum temperature reaches 2600 °C to 3400 °C. The hot pressing furnace 100 is used for heat treating at least one workpiece 200.

[0024] Among them, the hot pressing furnace 100 includes a hot pressing furnace main body 10, a heating element 16, a first pressing head 20, a first press 40 and a control system 70. The heating element 16 is located inside the hot pressing furnace main body 10. The first pressing head 20 is located inside the hot pressing furnace main body 10 and presses against one surface of the workpiece 200. The first press 40 and the control system 70 are located outside the hot pressing furnace main body 10. The heating element 16 generates heat to heat treat the workpiece 200. The first pressing head 20 is fixed on the first press 40, and the first press 40 drives the first pressing head 20 to reciprocate inside the hot pressing furnace main body 10. The control system 70 is electrically connected to the first press 40 to control the movement of the first press 40.

[0025] In this embodiment, the hot press furnace 100 further includes a second press head 30 and a second press 50. The second press head 30 is located inside the hot press furnace main body 10. The first press head 20 and the second press head 30 respectively press against opposite two surfaces of the workpiece 200. The second press head 30 is disposed on the second press 50. The second press 50 is located outside the hot press furnace main body 10 and is used to drive the second press head 30 to reciprocate inside the hot press furnace main body 10. The control system 70 is electrically connected to the second press 50 to control the movement of the second press 50.

[0026] Specifically, the first press head 20 and the second press head 30 are used to apply pressure to the workpiece 200. Specifically, the first press head 20 provides pressure to the workpiece 200, and the second press head 30 supports the workpiece 200, acting as an anvil. In other embodiments, the second press head 30 can also be fixed in position to counteract the pressure generated by the first press 30.

[0027] Among them, the first press 40 and the second press 50 can be a conventional hydraulic press, a water press or other presses.

[0028] In other embodiments, the hot press furnace 100 may not include the second press head 30 and a second press 50.

[0029] In other embodiments, the hot press furnace 100 may not include the second press 50. At this time, the second press head 30 is fixed.

[0030] Among them, the hot press furnace main body 10 has a heat treatment chamber 12. Specifically, the workpiece 200, the first press head 20 and the second press head 30 are all located inside the heat treatment chamber 12. The first press 40 drives the first press head 20 to reciprocate inside the heat treatment chamber 12, and the second press 50 drives the second press head 30 to reciprocate inside the heat treatment chamber 12. The heating element 16 can be located inside the heat treatment chamber 12 or may not be located inside the heat treatment chamber 12.

[0031] Among them, the hot press furnace main body 10 includes a housing 11 that constitutes the heat treatment chamber 12; the housing 11 includes a protective layer 112 and a heat insulation layer 111. The protective layer 112 surrounds the heat insulation layer 111, and the heat insulation layer 111 forms the heat treatment chamber 12.

[0032] Among them, the heat insulation layer 111 is used to prevent the heat in the heat treatment chamber 12 from escaping. In this embodiment, the material of the heat insulation layer 111 is carbonaceous materials such as coke, metallurgical carbon, and carbon black. Among them, the material of the protective layer 112 is refractory bricks.

[0033] Among them, the housing 11 has a first opening 113 and a second opening 114. The first punch 20 enters the heat treatment chamber 12 through the first opening 113, and the second punch 30 enters the heat treatment chamber 12 through the second opening 114. A first seal 18 is formed between the first opening 113 and the first punch 20, and a second seal 19 is formed between the second opening 114 and the second punch 30. The first seal 18 and the second seal 119 are used to seal the hot press furnace body 10.

[0034] In this embodiment, a secondary reaction chamber 15 is also provided in the heat insulation layer 111, and the secondary reaction chamber 15 is used as a reaction chamber for secondary reactions. Specifically, the reactants for the secondary reaction can be placed in a reaction vessel (such as a crucible, etc.), and the reaction vessel can be placed in the secondary reaction chamber 15 to make full use of the heat generated by the hot press furnace to heat-treat the reactants for the secondary reaction.

[0035] In this embodiment, the hot press furnace body 10 also has a heating chamber 13 and a cooling chamber 14. The heat treatment chamber 12 is located between the heating chamber 13 and the cooling chamber 14. Among them, the heating chamber 13 and the cooling chamber 14 are also surrounded by the heat insulation layer 111 and the protective layer 112. An inert gas is passed through the heating chamber 13, the heat treatment chamber 12, and the cooling chamber 14 to prevent the workpiece 200 from oxidizing too quickly.

[0036] Specifically, when the workpiece 200 is heated to a specified temperature in the heating chamber 13, the first punch 20 and the second punch 30 carry the workpiece 200 from the heating chamber 13 into the heat treatment chamber 12. After the hot pressing of the workpiece 200 is completed, the first punch 20 and the second punch 30 carry the workpiece 200 from the heat treatment chamber 12 into the cooling chamber 14, and the workpiece 200 is cooled to another temperature in the cooling chamber 14.

[0037] Among them, partitions can be provided between the heating chamber 13, the heat treatment chamber 12, and the cooling chamber 14 to separate them and connect them indirectly, or partitions can not be provided and they can be directly connected.

[0038] Among them, the heating chamber 13 can generate heat by one of eddy current heating, resistance heating, and combustible material heating. The heat treatment chamber 12 can generate heat by at least two of eddy current heating, resistance heating, and combustible material heating together. A cooling assembly 17 is provided in the cooling chamber 14. There is a coolant in the cooling assembly 17, and the cooling liquid can flow through the heating chamber 13 through a pipeline, playing a role in assisting heating and enhancing heat preservation.

[0039] In this embodiment, the heating chamber 13 generates heat by means of eddy current heating, and the heat treatment chamber 12 generates heat by means of eddy current heating and resistance heating. The cooling assembly 17 is used to reduce the temperature in the cooling chamber 14 to cool the workpiece 200 after heat treatment to a specified temperature.

[0040] Specifically, the eddy current heating is achieved by a coil 16 generating heat. The coil 16 is spiral and buried in the heat insulation layer 111. The coil 16 surrounds and induces the workpiece 200 to form an electromagnetic field around the workpiece 200, thereby causing the workpiece 200 to generate heat. In the eddy current heating, the coil 16 serves as the heating element of the hot pressing furnace 100.

[0041] In one embodiment, the coil 16 is made of artificial carbon material. The carbon material has the characteristic of high temperature resistance, which makes it different from metal coils. It can be close to the hot-pressed workpiece without water cooling. The coil serves as both a heating body and an induction material, providing a stronger energy penetration ability than traditional heating elements. Here, the artificial carbon material can be artificial graphite, which has the advantages of small resistance, low sublimation speed at the graphitization temperature, and long service life; it can also be carbon fiber, which has the advantages of low cost, easy processing and forming, a certain degree of graphitization, small resistance, and small heat generation. In order to protect the coil, materials such as ceramics can be used to wind the coil 16 on the outer layer of the coil 16 to electrically insulate the coil 16 from other substances.

[0042] In another embodiment, the coil 16 is made of metal copper and has a cavity (not shown in the figure) inside, and the cavity is filled with a coolant to prevent the coil itself from overheating and melting. In this embodiment, the coolant is water.

[0043] In this embodiment, the hot pressing furnace 100 further includes a power supply 60, which is electrically connected to the first pressing head 20 and the second pressing head 30 respectively. Both the first pressing head 20 and the second pressing head 30 are graphite pressing heads. The first pressing head 20 presses against the workpiece 200 and the second pressing head 300, so that the first pressing head 20, the workpiece 200 and the second pressing head 300 are connected in series to form a circuit among the power supply 60, the first pressing head 20, the workpiece 200 and the second pressing head 300. Since the resistances of the first pressing head 20 and the second pressing head 30 are relatively small, after being energized, the thermal power is mainly concentrated on the workpiece 200, so that the workpiece 200 heats up relying on its own resistance, thereby completing the heat treatment. In this case, the circuit formed among the power supply 60, the first pressing head 20, the workpiece 200 and the second pressing head 300 is equivalent to the above-mentioned heating element.

[0044] Among them, the hot pressing furnace 100 can be set up vertically or horizontally.

[0045] The hot pressing furnace provided by the present invention: 1) By setting at least one pressing head and a press for controlling the movement of the pressing head and applying pressure to the pressing head, the workpiece can be pressurized while undergoing heat treatment, so that the workpiece can be formed into shapes such as film-like, block-like, plate-like, etc.; 2) By setting two pressing heads and two presses, the hot pressing process of the workpiece can be carried out continuously; the two pressing heads and the two presses cooperate with the heating chamber, the heat treatment chamber and the cooling chamber, so that the heat treatment of the workpiece can be carried out in stages, thereby protecting the pressing head and the workpiece; in this way, through the repeated movement of the pressing head, the workpieces are arranged in order to reach the high-temperature area in turn to complete the heat treatment, and a continuous high-temperature hot pressing furnace can be formed; 3) By opening up a space in the heat insulation layer as a reaction chamber for side reactions, the heat generated by the hot pressing furnace can be fully utilized to heat-treat the reactants of the side reactions.

[0046] The above is only the preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed in the above preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to it in the scope of the technical solution of the present invention to make it an equivalent embodiment with equivalent changes, but as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A hot pressing furnace for heat-treating at least one workpiece; comprising a hot pressing furnace main body and a heating element located within the hot pressing furnace main body; the hot pressing furnace main body has a heat treatment cavity, and the heating element generates heat to heat-treat the workpiece; characterized in that, The main body of the hot pressing furnace further has a heating chamber and a cooling chamber, and the heat treatment chamber is located between the heating chamber and the cooling chamber; the hot pressing furnace further includes: A first pressing head, which is located in the heat treatment chamber; the first pressing head presses against one surface of the workpiece; A first press, on which the first pressing head is arranged, and the first press is located outside the main body of the hot pressing furnace and is used to drive the first pressing head to reciprocate in the heat treatment chamber, the heating chamber and the cooling chamber; A second pressing head, which is located in the heat treatment chamber, and the first pressing head and the second pressing head respectively press against two opposite surfaces of the workpiece; A second press, on which the second pressing head is arranged, and the second press is located outside the main body of the hot pressing furnace and is used to drive the second pressing head to reciprocate in the heat treatment chamber, the heating chamber and the cooling chamber; and A control system, which controls the movement of the first press and the second press.

2. The hot pressing furnace according to claim 1, wherein Inert gas is passed through the heating chamber, the heat treatment chamber and the cooling chamber.

3. The hot pressing furnace according to claim 2, characterized in that, The heating chamber uses one of eddy current heating, resistance heating and combustible material heating; the heat treatment chamber uses at least two of eddy current heating, resistance heating and combustible material heating to heat together; a cooling component is arranged in the cooling chamber.

4. The hot pressing furnace according to claim 1, characterized in that, The main body of the hot pressing furnace includes a housing forming the heat treatment chamber; the housing includes a protective layer and a heat insulation layer, the protective layer surrounds the heat insulation layer, and the heat insulation layer surrounds the heat treatment chamber; the housing has a first opening, and the first pressing head enters the heat treatment chamber through the first opening, and a first sealing member is formed between the first opening and the first pressing head.

5. The hot pressing furnace according to claim 4, wherein, The housing also has a second opening, and the second pressing head enters the heat treatment chamber through the second opening; a second sealing member is formed between the second opening and the second pressing head.

6. The hot pressing furnace according to claim 4, characterized in that, The heating mode of the heating element is eddy current heating; the eddy current heating is carried out through a coil, the coil is spiral and buried in the heat insulation layer; the coil surrounds and induces the workpiece to form an electromagnetic field, thereby heating the workpiece.

7. The hot pressing furnace according to claim 6, characterized in that, The coil is made of artificial carbon material.

8. The hot pressing furnace according to claim 1, characterized in that, The heating mode of the heating element is resistance heating; the hot pressing furnace further includes a power supply, the power supply is electrically connected to the first pressing head and the second pressing head respectively, both the first pressing head and the second pressing head are graphite pressing heads, and the first pressing head, the workpiece and the second pressing head are connected in series.

9. The hot pressing furnace according to claim 4, wherein A secondary reaction chamber is further arranged inside the heat insulation layer, and the secondary reaction chamber is used as a reaction chamber for secondary reactions.

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