Jacking and upsetting process for tooth sleeve of small cutting tooth

Abstract

The invention relates to the technical field of metal plastic forming, in particular to a small cutting tooth sleeve upsetting process which comprises a heating furnace and a cover plate which are detachably connected, a sealing assembly is arranged on the cover plate, and an inner furnace and a rotating assembly are arranged on the inner side of the heating furnace. According to the device, the heating assembly is arranged, the first forward and reverse rotation motor drives the rotating roller, the rotating motion is converted into the continuous lifting motion of the electric heating ring through the spiral groove and the sliding rod, and therefore heat does not statically act on a certain section of a pipe blank, but dynamically covers the whole length of the pipe blank; the inner furnace for heating is also driven by the rotating assembly to rotate, so that each circumferential surface of the pipe blank can uniformly receive radiant heat, a dynamic heat source capable of rotating and moving up and down is further formed, a static high-temperature area and a static low-temperature area generated by traditional fixed heating are broken through, and the heating efficiency is improved. And the temperature gradient of the pipe blank in the axial direction and the circumferential direction is effectively eliminated.

Description

Technical Field

[0001] This invention relates to the field of metal plastic forming technology, and in particular to a small cutting tooth sleeve top upset process. Background Technology

[0002] Cutting teeth are key wear parts on equipment such as coal mining machines and tunneling machines. They are fixed to the equipment drum by a tooth sleeve. The tooth sleeve is subjected to huge impacts and wear during operation, so it is required to have high strength, toughness and wear resistance.

[0003] Small cutting tooth sleeves have important applications in mining and other fields. Research on their upsetting process is crucial for improving the quality and production efficiency of cutting tooth sleeves. The upsetting process involves applying pressure to a metal billet in a mold. However, during the manufacturing process, the billet needs to be heated to a suitable temperature range, generally around 800-1000℃, to give the metal material good plasticity, which facilitates the subsequent upsetting operation.

[0004] However, traditional heating furnaces such as annular heating furnaces have uneven billet temperatures, resulting in "yin-yang" problems, which lead to uneven wall thickness in subsequent processing. This uneven heating will cause uneven stress distribution inside the gear sleeve material and reduce the service life of the finished product. To address this, a small cutting gear sleeve top upsetting process is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a small-scale cutting tooth sleeve top upset process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for upsetting a small cutting tooth sleeve, the operation steps are as follows: S1: First, start the heating device, then open the cover plate, put the tube blank into the inner furnace, close the cover plate and start the sealing assembly. The electric push rod drives the sealing cover to close, and the sealing element is inserted into the groove to form a sealed environment. S2: Simultaneously start the rotating component and the heating component. The second forward and reverse motor drives the inner furnace to rotate. At the same time, the electric heating rod is driven to rotate through the meshing of the gear ring and gear. The first forward and reverse motor drives the rotating roller to rotate. The electric heating ring is driven to rise and fall through the spiral groove and slide rod. S3: The tube blank rotates with the furnace body inside the furnace. The electric heating rod heats from the inside, and the electric heating coil heats dynamically from the outside. The rotation of the inner furnace and the raising and lowering of the electric heating coil ensure that the heat is evenly transferred to every part of the tube blank, with a consistent temperature distribution and no local overheating or undercooling. S4: When the tube blank reaches the predetermined temperature, such as the forging temperature required for the upsetting process, stop rotating and heating, open the sealing cover, and take out the uniformly heated tube blank for subsequent upsetting. S5: Uniformly heated tube blanks are easy to deform in the upsetting process, with uniform wall thickness and uniform internal stress distribution, thereby improving the mechanical properties and service life of the gear sleeve.

[0007] The small cutting tooth sleeve upsetting heating device includes a detachably connected heating furnace and a cover plate. The cover plate is provided with a sealing component. The inner side of the heating furnace is provided with an inner furnace and a rotating component. The rotating component includes a rotating plate, a turntable, multiple electric heating rods, and a connecting frame. The turntable is rotatably connected to the lower inner side of the heating furnace. The inner furnace is fixedly connected to the top of the turntable. The rotating plate is rotatably connected to the bottom of the inner furnace. The two ends of the connecting frame are fixedly connected to the bottom and the outer side of the inner furnace, respectively. The electric heating rods are disposed on the rotating plate and located inside the inner furnace. A heating assembly is provided on the outside of the inner furnace. The heating assembly includes a rotating roller and multiple electric heating coils, a spiral groove and a sliding rod. The rotating roller is rotatably connected to a connecting frame. The spiral groove is formed on the surface of the rotating roller. One end of the sliding rod is movably connected to the spiral groove. The electric heating coils are sleeved on the outside of the inner furnace.

[0008] Preferably, the rotating assembly further includes a second forward and reverse rotating motor, a gear ring, a bracket, and gears; The second forward and reverse motor is fixedly installed inside the heating furnace, the gear ring is fixedly assembled to the outer wall of the rotating plate, the bracket is fixedly connected to the inner wall of the heating furnace, and the gear is rotatably assembled to one side of the bracket.

[0009] Preferably, the output shaft end of the second forward and reverse motor is fixedly connected to the turntable and is used to drive the inner furnace to rotate via the turntable.

[0010] Preferably, the gear ring meshes with the tooth groove of the gear and is used to drive the plurality of electric heating rods to rotate via a rotating plate.

[0011] Preferably, the heating assembly further includes a first forward and reverse rotating motor, which is fixedly installed inside one of the connecting brackets.

[0012] Preferably, the output shaft end of the first forward and reverse motor is fixedly connected to the rotating roller and is used to drive the rotating roller to rotate.

[0013] Preferably, the other end of the slide rod is fixedly connected to the electric heating coil, and the spiral groove is used to drive the electric heating coil to rise and fall outside the inner furnace via the slide rod.

[0014] Preferably, the sealing assembly includes an electric push rod, a sealing cap, a groove, and a sealing element; The electric push rod is fixedly installed on the top of the cover plate, the sealing cover is rotatably connected to the output end of the electric push rod, the groove is formed on the inner wall of the inner furnace, and the sealing element is disposed on the surface of the sealing cover.

[0015] Preferably, the sealing cap is shaped to fit the top opening of the inner furnace, and the groove is shaped to fit the seal, which improves the sealing performance of the inner furnace when engaged.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up sealing components, the tight engagement of the seal with the groove and the tight fit of the sealing cover with the furnace opening constitute a highly efficient airtight barrier, reducing the convection and thermal radiation between the hot gas inside the furnace and the outside, and locking the heat firmly inside the furnace, so that the energy is more concentrated for heating the workpiece, rather than being wasted on heating the ambient air. Due to the low heat loss, the system can reach and maintain the set process temperature more quickly, improving the production cycle. 2. By setting up a heating component, the first forward and reverse motor drives the rotating roller, and the spiral groove and slide bar convert the rotational motion into the continuous lifting and lowering motion of the electric heating coil. This means that the heat does not act statically on a certain section of the tube blank, but dynamically covers its entire length. While the electric heating coil is lifting and lowering, the inner furnace itself is also driven to rotate by the rotating component. This ensures that every circumferential surface of the tube blank can receive radiant heat evenly, thus forming a dynamic heat source that both rotates and moves up and down. This breaks the static high-temperature zone and low-temperature zone generated by traditional fixed heating, effectively eliminating the temperature gradient of the tube blank in the axial and circumferential directions. It makes the tube blank at almost the same ideal forging temperature from beginning to end and from the inside to the outside, effectively solving the problems of "uneven wall thickness" and "internal stress concentration" in the subsequent upsetting process. 3. By setting up a rotating component, the second forward and reverse motor drives the turntable, causing the entire inner furnace to rotate around the central axis of the heating furnace. This ensures that the tube blank placed in the furnace can periodically pass through all areas of the furnace, avoiding the difference in heat radiation in a fixed direction. Through the meshing of the gear ring and the fixed gear, while the inner furnace revolves, the rotating plate and the electric heating rod on it rotate relative to the inner furnace itself. In this way, the rotation of the electric heating rod acts like a stirrer, directly and actively stirring the hot air and radiation field in the inner furnace space, breaking the temperature stratification caused by the natural convection of hot air during static heating, which is hot at the top and cold at the bottom, and hot near and cold far. The tube blank revolves with the inner furnace, while the internal heat source (electric heating rod) rotates. This relative motion ensures that heat can be transferred to every surface of the tube blank from all angles, without dead angles, and evenly. Attached Figure Description

[0017] Figure 1 This is a front structural schematic diagram of a small cutting tooth sleeve top upsetting process proposed in this invention; Figure 2 This is a cross-sectional structural diagram of a heating furnace for a small cutting tooth sleeve top upsetting process proposed in this invention. Figure 3 This invention proposes a small-scale upsetting process for cutting tooth sleeves. Figure 2 A schematic diagram of structure A in the diagram; Figure 4 This is a schematic diagram of the sealing component structure for a small cutting tooth sleeve top upsetting process proposed in this invention; Figure 5 This is a side view of the structure of a small cutting tooth sleeve upsetting process proposed in this invention; Figure 6 This is a schematic diagram of the rotating component structure for a small cutting tooth sleeve upsetting process proposed in this invention; Figure 7 This invention proposes a small-scale upsetting process for cutting tooth sleeves. Figure 6 A schematic diagram of structure B in the diagram; Figure 8 This is a schematic diagram of the heating assembly structure for a small cutting tooth sleeve upsetting process proposed in this invention.

[0018] In the diagram: 1. Heating furnace; 2. Cover plate; 3. Inner furnace; 4. Sealing assembly; 41. Electric push rod; 42. Sealing cover; 43. Groove; 44. Seal; 5. Heating assembly; 51. First forward / reverse motor; 52. Rotating roller; 53. Electric heating coil; 54. Spiral groove; 55. Slide rod; 6. Rotating assembly; 61. Rotating plate; 62. Electric heating rod; 63. Second forward / reverse motor; 64. Turntable; 65. Connecting frame; 66. Gear ring; 67. Support; 68. Gear. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0021] Reference Figures 1-8 A small cutting tooth sleeve top upsetting process, the operation steps are as follows: S1: First, start the heating device, then open the cover plate 2, put the tube blank into the inner furnace 3, close the cover plate 2 and start the sealing assembly 4. The electric push rod 41 drives the sealing cover 42 to close, and the sealing element 44 is inserted into the groove 43 to form a sealed environment. S2: Simultaneously start the rotating component 6 and the heating component 5. The second forward and reverse motor 63 drives the inner furnace 3 to rotate. At the same time, the electric heating rod 62 is driven to rotate through the meshing of the gear ring 66 and the gear 68. The first forward and reverse motor 51 drives the rotating roller 52 to rotate. The electric heating ring 53 is driven to rise and fall through the spiral groove 54 and the slide rod 55. S3: The tube blank rotates with the furnace body inside the inner furnace 3. The electric heating rod 62 heats from the inside, and the electric heating coil 53 heats dynamically from the outside. The rotation of the inner furnace 3 and the raising and lowering of the electric heating coil 53 ensure that the heat is evenly transferred to every part of the tube blank, with a consistent temperature distribution and no local overheating or undercooling. S4: When the tube blank reaches the predetermined temperature, such as the forging temperature required for the upsetting process, stop rotating and heating, open the sealing cover 42, and take out the uniformly heated tube blank for subsequent upsetting. S5: Uniformly heated tube blanks are easy to deform in the upsetting process, with uniform wall thickness and uniform internal stress distribution, thereby improving the mechanical properties and service life of the gear sleeve.

[0022] The small cutting tooth sleeve top upsetting heating device includes a detachably connected heating furnace 1 and a cover plate 2. A sealing component 4 is provided on the cover plate 2. An inner furnace 3 and a rotating component 6 are provided inside the heating furnace 1. The rotating component 6 includes a rotating plate 61, a turntable 64, multiple electric heating rods 62, and a connecting frame 65. The turntable 64 is rotatably connected to the lower inner side of the heating furnace 1. The inner furnace 3 is fixedly connected to the top of the turntable 64. The rotating plate 61 is rotatably connected to the bottom of the inner furnace 3. The two ends of the connecting frame 65 are fixedly connected to the bottom and the outer side of the inner furnace 3, respectively. The electric heating rods 62 are provided on the rotating plate 61 and located inside the inner furnace 3. A heating assembly 5 is provided on the outside of the inner furnace 3. The heating assembly 5 includes a rotating roller 52 and multiple electric heating coils 53, a spiral groove 54 and a slide rod 55. The rotating roller 52 is rotatably connected to a connecting frame 65. The spiral groove 54 is formed on the surface of the rotating roller 52. One end of the slide rod 55 is movably connected to the spiral groove 54. The electric heating coils 53 are sleeved on the outside of the inner furnace 3. Rotating assembly 6 also includes a second forward and reverse motor 63, a gear ring 66, a bracket 67, and a gear 68; The second forward and reverse motor 63 is fixedly installed inside the heating furnace 1, the gear ring 66 is fixedly assembled on the outer wall of the rotating plate 61, the bracket 67 is fixedly connected to the inner wall of the heating furnace 1, and the gear 68 is rotatably assembled on one side of the bracket 67. The heating assembly 5 also includes a first forward and reverse motor 51, which is fixedly mounted on the inside of a connecting bracket 65; The sealing assembly 4 includes an electric push rod 41, a sealing cover 42, a groove 43, and a sealing element 44; The electric push rod 41 is fixedly installed on the top of the cover plate 2, the sealing cover 42 is rotatably connected to the output end of the electric push rod 41, the groove 43 is formed on the inner wall of the inner furnace 3, and the sealing element 44 is provided on the surface of the sealing cover 42.

[0023] In the embodiment of the above technical solution, after the material is loaded, the electric push rod 41 pushes the sealing cover 42 downward to make it fit tightly against the top opening of the inner furnace 3. The groove 43 is formed on the inner wall of the inner furnace 3, and the sealing element 44 (such as a rubber sealing ring) is set on the surface of the sealing cover 42. When the sealing cover 42 is closed, the sealing element 44 is inserted into the groove 43 to form a double sealing structure, which effectively prevents heat leakage and oxygen from entering, improves the heat preservation performance and heating environment stability inside the inner furnace 3, and the opening and closing of the sealing component can be automatically controlled and synchronized with the heating process, reducing manual intervention and improving process consistency. By activating the second forward and reverse motor 63, its output shaft drives the turntable 64 to rotate, causing the inner furnace 3, fixed to the top of the turntable 64, to rotate as a whole. The rotation of the inner furnace 3 causes the tube blank placed inside to rotate with the furnace body, preventing the tube blank from exhibiting "yin-yang" heating (i.e., one side overheated, the other side undercooled) due to a fixed heating position. This rotation ensures uniform circumferential temperature distribution of the tube blank. The electric heating rod 62 is used to directly heat the tube blank internally. When the inner furnace 3 rotates, the gear ring 66 moves with the rotating plate 61 and meshes with the fixed gear 68. Because the gear 68 is in a fixed position, the gear... The meshing of ring 66 and gear 68 drives rotating plate 61 to rotate relative to the bottom of inner furnace 3, thereby driving electric heating rod 62 to rotate inside inner furnace 3. The rotation of electric heating rod 62 further stirs the internal heat field, so that heat is evenly radiated from the inside of the tube blank, avoiding internal hot or cold spots. The two ends of connecting frame 65 are fixedly connected to the bottom and the outside of inner furnace 3 respectively to enhance structural stability. In addition, through the combined motion of inner furnace 3 rotation and electric heating rod 62 rotation, the tube blank is heated evenly, effectively eliminating the problem of uneven temperature caused by static heating in traditional heating. By starting the first forward and reverse motor 51, its output shaft drives the rotating roller 52 to rotate, and the spiral groove 54 rotates accordingly. The slide rod 55 moves up and down in a straight line under the guidance of the spiral groove 54, thereby driving the electric heating ring 53 to rise and fall along the outside of the inner furnace 3. During the rising and falling process, the electric heating ring 53 heats the outer wall of the inner furnace 3, covering the entire height range of the inner furnace 3, avoiding uneven external temperature caused by heating in a fixed position. Furthermore, the rotation of the inner furnace 3 makes the billet circumferentially heated evenly, while the rising and falling of the electric heating ring 53 makes the billet axially heated evenly. This dynamic heating ensures that the temperature inside and outside the billet is consistent, completely eliminating the "yin-yang" phenomenon. It should be noted that after the sealing cover 42 is closed, it does not obstruct the rotation of the inner furnace 3. Instead, it changes from a "stationary state" to a "following state" through the locking structure with the top of the inner furnace 3, that is, it rotates together with the inner furnace 3. During the entire rotation heating process, the electric push rod 41 always maintains downward pressure to ensure that the sealing element 44 is in close contact with the groove 43, thereby achieving dynamic sealing. Furthermore, the outer sides of the first forward and reverse motor 51 and the second forward and reverse motor 63 are both equipped with protective shells. The protective shells adopt a double-layer structure, with high-performance heat insulation materials (such as ceramic fiber, aerogel, etc.) filled in the middle, which have a heat insulation effect.

[0024] The preferred technical solution in this embodiment is: Reference Figure 6 The output shaft end of the second forward and reverse motor 63 is fixedly connected to the turntable 64 and is used to drive the inner furnace 3 to rotate through the turntable 64, so that the output shaft of the second forward and reverse motor 63 drives the turntable 64 to rotate, thereby causing the inner furnace 3 fixed to the top of the turntable 64 to rotate as a whole. Reference Figure 7 The toothed ring 66 meshes with the tooth groove of the gear 68 and is used to drive multiple electric heating rods 62 to rotate through the rotating plate 61. When the inner furnace 3 rotates, the toothed ring 66 moves with the rotating plate 61 and meshes with the fixed gear 68. Since the position of the gear 68 is fixed, the meshing of the toothed ring 66 with the gear 68 will drive the rotating plate 61 to rotate relative to the bottom of the inner furnace 3. Reference Figure 8 The output shaft end of the first forward and reverse motor 51 is fixedly connected to the rotating roller 52 and is used to drive the rotating roller 52 to rotate, so that the output shaft of the first forward and reverse motor 51 drives the rotating roller 52 to rotate, and the spiral groove 54 rotates accordingly. Reference Figure 8 The other end of the slide rod 55 is fixedly connected to the electric heating coil 53, and the spiral groove 54 is used to drive the electric heating coil 53 to rise and fall outside the inner furnace 3 through the slide rod 55, so that both the electric heating rod 62 and the electric heating coil 53 can be temperature-controllable electric heating elements. The heating power and time can be adjusted through the external control system to further optimize the heating curve and adapt to tube blanks of different materials. Reference Figure 2 The sealing cover 42 is adapted to the shape of the top opening of the inner furnace 3, and the groove 43 is adapted to the shape of the sealing element 44. It is used to improve the sealing of the inner furnace 3 when it is closed. When the sealing cover 42 is closed, the sealing element 44 is inserted into the groove 43 to form a double sealing structure, which effectively prevents heat leakage and oxygen from entering, and improves the heat preservation performance and heating environment stability of the inner furnace 3.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for top upset forming of a small cutting tooth sleeve, characterized in that, The operation steps are as follows: S1: First, start the heating device, then open the cover plate (2), put the tube blank into the inner furnace (3), close the cover plate (2) and start the sealing assembly (4), the electric push rod (41) drives the sealing cover (42) to close, and the sealing element (44) is inserted into the groove (43) to form a sealed environment; S2: Simultaneously start the rotating component (6) and the heating component (5), the second forward and reverse motor (63) drives the inner furnace (3) to rotate, and at the same time drive the electric heating rod (62) to rotate through the meshing of the gear ring (66) and the gear (68), the first forward and reverse motor (51) drives the rotating roller (52) to rotate, and drive the electric heating ring (53) to rise and fall through the spiral groove (54) and the slide rod (55); S3: The tube blank rotates with the furnace body inside the inner furnace (3). The electric heating rod (62) heats from the inside, and the electric heating coil (53) heats dynamically from the outside. The rotation of the inner furnace (3) and the lifting and lowering of the electric heating coil (53) ensure that the heat is evenly transferred to every part of the tube blank, the temperature distribution is consistent, and there is no local overheating or undercooling. S4: When the tube blank reaches the predetermined temperature, such as the forging temperature required for the top upsetting process, stop rotating and heating, open the sealing cover (42), and take out the uniformly heated tube blank for subsequent top upsetting; S5: Uniformly heated tube blanks are easy to deform in the upsetting process, with uniform wall thickness and uniform internal stress distribution, thereby improving the mechanical properties and service life of the gear sleeve.

2. A heating device for implementing the upsetting process of a small cutting tooth sleeve as described in claim 1, characterized in that: The heating furnace (1) and cover plate (2) are detachably connected. A sealing component (4) is provided on the cover plate (2). An inner furnace (3) and a rotating component (6) are provided on the inner side of the heating furnace (1). The rotating component (6) includes a rotating plate (61), a turntable (64), multiple electric heating rods (62), and a connecting frame (65). The turntable (64) is rotatably connected to the lower inner side of the heating furnace (1). The inner furnace (3) is fixedly connected to the top of the turntable (64). The rotating plate (61) is rotatably connected to the bottom of the inner furnace (3). The two ends of the connecting frame (65) are fixedly connected to the bottom and the outer side of the inner furnace (3), respectively. The electric heating rods (62) are provided on the rotating plate (61) and located inside the inner furnace (3). A heating assembly (5) is provided on the outside of the inner furnace (3). The heating assembly (5) includes a rotating roller (52) and multiple electric heating coils (53), a spiral groove (54) and a slide rod (55). The rotating roller (52) is rotatably connected to a connecting frame (65). The spiral groove (54) is formed on the surface of the rotating roller (52). One end of the slide rod (55) is movably connected to the spiral groove (54). The electric heating coils (53) are sleeved on the outside of the inner furnace (3).

3. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 2, characterized in that, The rotating assembly (6) also includes a second forward and reverse motor (63), a gear ring (66), a bracket (67), and a gear (68). The second forward and reverse motor (63) is fixedly installed inside the heating furnace (1), the gear ring (66) is fixedly assembled on the outer wall of the rotating plate (61), the bracket (67) is fixedly connected to the inner wall of the heating furnace (1), and the gear (68) is rotatably assembled on one side of the bracket (67).

4. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 3, characterized in that, The output shaft end of the second forward and reverse motor (63) is fixedly connected to the turntable (64) and is used to drive the inner furnace (3) to rotate via the turntable (64).

5. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 3, characterized in that, The toothed ring (66) meshes with the tooth groove of the gear (68) and is used to drive the plurality of electric heating rods (62) to rotate via the rotating plate (61).

6. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 2, characterized in that, The heating assembly (5) also includes a first forward and reverse motor (51), which is fixedly installed inside a connecting frame (65).

7. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 6, characterized in that, The output shaft end of the first forward and reverse motor (51) is fixedly connected to the rotating roller (52) and is used to drive the rotating roller (52) to rotate.

8. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 2, characterized in that, The other end of the slide bar (55) is fixedly connected to the electric heating coil (53), and the spiral groove (54) is used to drive the electric heating coil (53) to rise and fall outside the inner furnace (3) through the slide bar (55).

9. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 2, characterized in that, The sealing assembly (4) includes an electric push rod (41), a sealing cap (42), a groove (43), and a sealing element (44). The electric push rod (41) is fixedly installed on the top of the cover plate (2), the sealing cover (42) is rotatably connected to the output end of the electric push rod (41), the groove (43) is formed on the inner wall of the inner furnace (3), and the sealing element (44) is disposed on the surface of the sealing cover (42).

10. The heating device for the upsetting process of a small cutting tooth sleeve according to claim 9, characterized in that, The sealing cap (42) is adapted to the shape of the top opening of the inner furnace (3), and the groove (43) is adapted to the shape of the sealing element (44), and is used to improve the sealing of the inner furnace (3) when locked.

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