High-speed steel fine wire annealing furnace for aviation micro drill

Abstract

The utility model discloses a high-speed steel fine wire annealing furnace for an aviation micro drill. The high-speed steel fine wire annealing furnace comprises an outer furnace body, an inner furnace body, a heating element, a base and a storage rack, the inner furnace body is arranged in the outer furnace body, and the heating element is arranged between the outer furnace body and the inner furnace body; the outer furnace body and the inner furnace body are arranged on the base; an inflation system is arranged in the center of the base, a vacuumizing system is arranged at the top of the annealing furnace, and the vacuumizing system is communicated with the inner furnace body; an air receiving connector matched with the inflation system is arranged at the bottom of the storage rack; the storage rack is provided with an air channel and an air outlet hole which are communicated with the air receiving connector.

Description

Technical Field

[0001] This utility model relates to the field of annealing furnaces, and in particular to an annealing furnace for high-speed steel micro-wires used in aerospace micro-drills. Background Technology

[0002] In this field, drill bits with a diameter less than 3.175 mm are generally referred to as micro drills, or simply micro drills. They are widely used in high-precision machining, especially in the machining of small parts in industries such as medical, aerospace, automotive, electronics, and watchmaking. They are typically made of materials such as high-speed steel, cemented carbide, and M35 cobalt high-speed steel.

[0003] Because of the small diameter of high-speed steel microfilaments, the presence of impurities such as oil film on their surface during annealing can severely impact their performance, causing oxidation, penetration, and bluing. Even with surface cleaning in the preceding process, complete cleanliness cannot be guaranteed, and there is a possibility of secondary contamination during the transfer of the microfilaments to the annealing furnace. Therefore, a device is needed to remove oil film and other impurities one second before annealing, and this device should not require significant modifications to the existing production line. Summary of the Invention

[0004] The problem to be solved by this utility model is to propose an improvement or replacement solution to address the shortcomings of the prior art, especially a device that can remove impurities such as oil film one second before annealing, and its structure is simple, which can make simple modifications to the existing annealing furnace and provide cleaning protection without replacing the whole equipment.

[0005] To solve the above problems, the present invention adopts the following solution: an annealing furnace for high-speed steel micro-wires used in aerospace micro-drills, characterized in that it includes an outer furnace body, an inner furnace body, a heating element, a base, and a shelf; the inner furnace body is disposed inside the outer furnace body, and the heating element is disposed between the outer furnace body and the inner furnace body; the outer furnace body and the inner furnace body are disposed on the base; a gas filling system is provided in the center of the base, and a vacuum system is provided at the top of the annealing furnace, the vacuum system being connected to the inner furnace body; a gas receiving connector matching the gas filling system is provided at the bottom of the shelf; and a gas channel and a gas outlet are provided on the shelf, which are connected to the gas receiving connector.

[0006] Furthermore, the high-speed steel micro-wire annealing furnace for aerospace micro-drills is characterized in that the shelf consists of a base, a vertical rod, and a gas receiving connector; the base has a through hole in the center for installing the gas receiving connector; the vertical rod is connected to the gas receiving connector, and the vertical rod has a gas channel communicating with the gas receiving connector, and the gas outlet is communicating with the gas channel.

[0007] Furthermore, the high-speed steel micro-wire annealing furnace for aerospace micro-drills is characterized in that the chassis is provided with an air outlet that communicates with the air passage inside the vertical rod.

[0008] Furthermore, the high-speed steel micro-wire annealing furnace for aerospace micro-drills is characterized in that a pair of brackets are provided on the base for adjusting the position of the shelf, facilitating the quick connection of the shelf to the inflation system.

[0009] Furthermore, the high-speed steel micro-wire annealing furnace for aerospace micro-drills is characterized in that the gas filling system includes a nitrogen tank, a gas pump, and a gas supply head; the gas supply head is located in the center of the base and matches the gas receiving connector.

[0010] Furthermore, the high-speed steel micro-wire annealing furnace for aerospace micro-drills is characterized in that a layer of heat-insulating material is provided on the inner side of the outer furnace body.

[0011] The technical effects of this invention are as follows: The annealing furnace designed in this way improves the internal rack, connecting it to the gas filling system and extending the gas filling nozzle into the interior of the high-speed steel microfilament coil. This allows the gas filling system to not only provide protective gas but also remove any oil film impurities that may be present on the surface of the high-speed steel microfilament. This prevents the high-speed steel microfilament from turning blue during the annealing process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the cross-section of an annealing furnace.

[0013] Figure 2 This is a schematic diagram of the base.

[0014] Figure 3 This is a schematic diagram of a storage rack.

[0015] Among them, 1 is the outer furnace body, 2 is the inner furnace body, 3 is the base, 4 is the vacuum system, 5 is the gas filling system, 6 is the heating element, 7 is the shelf, 31 is the card seat, 51 is the nitrogen tank and gas pump, 52 is the gas supply head, 71 is the chassis, 72 is the vertical rod, 73 is the gas receiving connector, 74 is the gas passage, and 75 is the gas outlet. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Example: Figure 1 , Figure 2 and Figure 3As shown, an annealing furnace for high-speed steel micro-wires used in aerospace micro-drills includes an outer furnace body, an inner furnace body, a heating element, a base, and a shelf. The inner furnace body is disposed within the outer furnace body, and the heating element is disposed between the outer and inner furnace bodies. The outer and inner furnace bodies are mounted on the base. A gas filling system is provided in the center of the base, and a vacuum system is provided at the top of the annealing furnace, which is connected to the inner furnace body. A gas receiving connector matching the gas filling system is provided at the bottom of the shelf. The shelf is provided with gas channels and gas outlets connected to the gas receiving connector.

[0018] The shelf consists of a base, vertical rods, and an air receiving connector. The base has a central through-hole for mounting the air receiving connector. The vertical rod connects to the air receiving connector and has an internal air passage communicating with it; the air outlet communicates with the air passage. The base also has an air outlet communicating with the internal air passage of the vertical rod. A pair of mounting brackets are provided on the base for adjusting the shelf's position, facilitating quick connection to the inflation system. The inflation system includes a nitrogen tank, an air pump, and an air supply head; the air supply head is located in the center of the base and matches the air receiving connector.

[0019] During operation, high-speed steel microfilaments are transferred into the annealing furnace using forklifts or other tools. The material tray aligns with the gas-filled base inside the furnace, and the furnace door is then closed to create a sealed space. Simultaneously, the heating elements, gas filling system, and vacuum system are activated for preheating. This preheating process removes impurities and oil films adhering to the surface of the high-speed steel microfilaments, while the vacuum system removes impurities and volatile oil gases. The gas filling system directly blows nitrogen gas through the material tray from between the high-speed steel microfilaments to prevent oil and impurities from remaining between them. This process also removes oxygen from the annealing furnace. After removing oil and impurities, nitrogen filling is stopped, and vacuuming continues. Once vacuuming is complete, the vacuum system is shut off, and the gas filling system is restarted to fill the annealing furnace with inert nitrogen. Finally, the furnace temperature is increased to complete the annealing process.

Claims

1. A high speed steel micro wire annealing furnace for aviation micro drills, characterized by, The annealing furnace comprises an outer furnace body, an inner furnace body, a heating element, a base and a storage rack; the inner furnace body is arranged in the outer furnace body, the heating element is arranged between the outer furnace body and the inner furnace body; the outer furnace body and the inner furnace body are arranged on the base; the central part of the base is provided with an air charging system, the top of the annealing furnace is provided with a vacuum pumping system, the vacuum pumping system is communicated with the inner furnace body; the bottom of the storage rack is provided with a gas receiving joint matched with the air charging system; the storage rack is provided with an air passage and a gas outlet communicated with the gas receiving joint.

2. The high speed steel micro wire annealing furnace for aviation micro drill according to claim 1, wherein The storage rack comprises a bottom disc, a vertical rod and a gas receiving joint; the central part of the bottom disc is provided with a through hole for mounting the gas receiving joint; the vertical rod is connected with the gas receiving joint, and the vertical rod is provided with an air passage communicated with the gas receiving joint; the gas outlet is communicated with the air passage.

3. The high speed steel micro wire annealing furnace for aviation micro drill according to claim 2, characterized in that, The bottom disc is provided with the gas outlet communicated with the air passage in the vertical rod.

4. The high speed steel micro wire annealing furnace for aviation micro drill according to claim 1, wherein The base is provided with a pair of clamping seats for adjusting the position of the storage rack, so that the storage rack can be quickly docked with the air charging system.

5. The high speed steel micro wire annealing furnace for aviation micro drill according to claim 1, wherein The air charging system comprises a nitrogen tank, an air pump and a gas supply head; the gas supply head is arranged in the central part of the base and matched with the gas receiving joint.

6. The high speed steel micro wire annealing furnace for aviation micro drill according to claim 1, wherein The inner side of the outer furnace body is provided with a layer of heat preservation material.

Images