A laser cutting device for producing a fitting

Abstract

This invention relates to the field of laser cutting technology for railway parts, and in particular provides a laser cutting device for parts production, including a laser cutting head, a slag blowing pipeline assembly, and an adaptive temperature control assembly. The slag blowing pipeline assembly includes an auxiliary air blowing pipe, a heat-conducting copper pipe, and a directional nozzle. The auxiliary air blowing pipe is located on the side of the laser cutting head, and the air outlet direction of the directional nozzle is towards the laser cutting area. One end of the heat-conducting copper pipe is fixedly attached to the heat source area of ​​the laser cutting head. The portion of the heat-conducting copper pipe located inside the auxiliary air blowing pipe is connected to a copper heat-conducting rod, which extends axially along the auxiliary air blowing pipe. This allows the compressed air to form a stable, slightly warm airflow after heat exchange, effectively avoiding problems such as cut shrinkage, micro-cracks, stress deformation, slag sticking, and slag adhesion caused by directly blowing room-temperature compressed air into the high-temperature cutting area.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology for railway parts, and in particular to a laser cutting device for parts production. Background Technology

[0002] In the field of parts manufacturing, especially in railway parts production, laser cutting technology is widely used in the cutting and processing of various railway metal and non-metal parts due to its advantages such as high cutting precision, high speed, small heat-affected zone, and strong adaptability. The core component of a laser cutting device is the laser cutting head, which emits a high-energy-density laser beam that acts on the surface of the railway parts to be processed, causing the surface material to melt and vaporize rapidly, thereby achieving cutting and shaping. As the requirements for processing precision and efficiency in railway parts production continue to increase, the application scenarios of laser cutting technology are becoming increasingly widespread. From small precision railway parts to large structural railway parts, all can be processed efficiently through laser cutting. Among them, the spring support plate of a freight car bogie is a typical railway part with high requirements for slag removal. If there is residual molten slag after cutting, it will directly affect the subsequent assembly precision and overall structural strength. If this waste heat is not properly treated, it will not only affect the working stability and service life of the laser cutting head, but also cause energy waste, which is inconsistent with the development trend of energy-saving production. Meanwhile, during laser cutting, auxiliary air is usually needed to blow away slag from the cutting area to remove the molten slag produced during cutting and ensure the cut quality of railway parts. However, existing auxiliary air is mostly room temperature compressed air, which can easily cause a sudden change in temperature in the cutting area and affect the processing accuracy of railway parts.

[0003] Currently, the slag removal method used with laser cutting heads involves setting up an air pipe near the laser cutting head, which blows compressed air directly onto the cutting path. To prevent the cutting path from contracting, developing micro-cracks, or deforming due to cold air, the gas needs to be heated. Therefore, a separate heating function is required on the laser cutting head. The required heat needs to be supplied by a separate heat source and a separate temperature control device, resulting in a large volume and high cost. Summary of the Invention

[0004] To address the above problems, the present invention provides the following technical solution: A laser cutting device for parts production includes a laser cutting head, a slag blowing pipeline assembly, and an adaptive temperature control assembly. The slag blowing pipeline assembly includes an auxiliary air blowing pipe, a heat-conducting copper pipe, and a directional nozzle. The auxiliary air blowing pipe is located on the side of the laser cutting head, with one end for receiving compressed air and the other end having the directional nozzle, the outlet direction of which faces the laser cutting area. One end of the heat-conducting copper pipe is fixedly attached to the heat source area of ​​the laser cutting head, and the other end is sealed and inserted into the auxiliary air blowing pipe. A copper heat-conducting rod is connected to the portion of the heat-conducting copper pipe inside the auxiliary air blowing pipe, and the copper heat-conducting rod extends axially along the auxiliary air blowing pipe. The adaptive temperature control component includes a copper sleeve fixedly fitted onto the outer wall of the copper heat-conducting rod, and a thermally insulating expansion tube movably fitted onto the outer wall of the copper heat-conducting rod. One end of the thermally insulating expansion tube is connected to the copper sleeve, and the other end can extend and retract along the axial direction of the copper heat-conducting rod. When the temperature of the laser cutting head changes, the thermally insulating expansion tube extends and retracts accordingly to adjust the effective heat exchange area between the copper heat-conducting rod and the airflow flowing through the auxiliary air blowing pipe. The compressed air flowing through the auxiliary air blowing pipe forms a stable micro-temperature airflow after heat exchange and is blown towards the laser cutting area through the directional nozzle.

[0005] More preferably, the copper heat-conducting rod is coaxial with the auxiliary air blowing pipe, and an annular air passage space is formed between the outer wall of the thermal expansion tube and the inner wall of the auxiliary air blowing pipe, surrounding the copper heat-conducting rod.

[0006] More preferably, the end of the copper heat-conducting rod away from the end connected to the heat-conducting copper tube has an outwardly protruding sphere, and the sphere is close to the air inlet end of the auxiliary air blowing tube.

[0007] More preferably, the end of the thermal expansion tube away from the copper sleeve is connected to a slip ring, and the inner ring of the slip ring is slidably adapted to the outer wall of the copper heat-conducting rod.

[0008] More preferably, the thermal expansion tube is a bimetallic thermal expansion sleeve.

[0009] More preferably, the directional nozzle is threadedly connected to the outlet end of the auxiliary air blowing pipe, and the outlet of the directional nozzle is provided with a guide slope so that the micro-temperature protective airflow is blown out along the tangent direction of the laser cutting edge, avoiding direct impact on the cutting molten pool.

[0010] More preferably, a sealing ring is provided at the insertion point of the heat-conducting copper tube and the auxiliary air blowing tube. The sealing ring is sleeved and fixed to the outer wall of the heat-conducting copper tube and is tightly fitted to the connection point of the through hole of the auxiliary air blowing tube to prevent compressed air from leaking from the gap between the two.

[0011] More preferably, the side of the laser cutting head is provided with an assembly hole corresponding to the air inlet end of the auxiliary air blowing tube, a connecting tube is fixed in the assembly hole, the connecting tube extends upward and is provided with a connecting part, and the air inlet end of the auxiliary air blowing tube passes upward into the assembly hole and is fixedly connected to the connecting tube.

[0012] More preferably, the directional nozzle is pointed and gradually tapers toward the laser cutting area.

[0013] The advantages of this invention compared to the prior art are: The device of this invention uses a heat-conducting copper pipe and a copper heat-conducting rod to conduct the waste heat generated by the laser cutting head to the auxiliary air blowing pipeline, realizing the recovery and utilization of waste heat in the production process of railway parts. The waste heat of the laser cutting head is transferred to the auxiliary air blowing flow through the heat-conducting copper pipe and the copper heat-conducting rod, and the preheating of the auxiliary air blowing can be completed without the need for additional heating equipment, effectively reducing energy consumption in the production process of railway parts and meeting the requirements of energy-saving production.

[0014] Meanwhile, through the precise adjustment of the adaptive temperature control component, the thermal expansion tube automatically expands and contracts with the temperature change of the laser cutting head, dynamically adjusting the contact area between the copper heat-conducting rod and the airflow, so that the auxiliary air blowing always maintains a stable temperature. This avoids the shrinkage and cracking of the railway parts cut surface caused by the direct blowing of room temperature compressed air onto the high temperature cutting area, and also prevents the airflow temperature from being too high and the slag from sticking together due to excessive waste heat. This significantly improves the cutting accuracy and cut quality of railway parts and reduces the rework rate of railway parts after cutting.

[0015] Furthermore, all components of the device are integrated into the side of the laser cutting head, making it compact and simple in structure. It eliminates the need for complex electrical control adjustments, reducing equipment costs for railway parts production while precisely adapting to the cutting requirements of railway parts. The directional nozzle can accurately apply micro-warm airflow to the cutting area, further ensuring the smoothness of the cut and guaranteeing the processing accuracy of railway parts. At the same time, it avoids the impact of unstable airflow temperature on the processing quality of railway parts. Overall, it is suitable for the production scenarios of railway parts and has strong practicality. Attached Figure Description

[0016] Figure 1 A schematic diagram of a laser cutting apparatus for accessory production provided in an embodiment of the present invention from a three-dimensional perspective; Figure 2 The laser cutting device for accessory production provided in the embodiments of the present invention consists of Figure 1 The resulting planar schematic diagram; Figure 3 The laser cutting device for accessory production provided in the embodiments of the present invention consists of Figure 1 A schematic diagram of the bottom view from below; Figure 4 The laser cutting device for accessory production provided in the embodiments of the present invention consists of Figure 3 A schematic diagram of section A after it has been cut open; Figure 5 The laser cutting device for accessory production provided in the embodiments of the present invention consists of Figure 4 Enlarged schematic diagram of section B; Figure 6 A schematic diagram illustrating the fit between the copper heat-conducting rod, the thermal expansion tube, the copper sleeve, and the slip ring in the laser cutting device for accessory production provided in the embodiments of the present invention.

[0017] In the diagram: 1. Laser cutting head; 2. Auxiliary air blowing pipe; 3. Heat-conducting copper pipe; 4. Directional nozzle; 5. Copper heat-conducting rod; 6. Copper sleeve; 7. Thermal expansion tube; 8. Annular air passage space; 9. Sphere; 10. Slip ring; 11. Sealing ring; 12. Assembly hole; 13. Connecting pipe. Detailed Implementation

[0018] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] In one implementation, such as Figures 1-6 As shown: This embodiment provides a laser cutting device for parts production, including a laser cutting head 1, a slag blowing pipeline assembly, and an adaptive temperature control assembly; The slag blowing pipeline assembly includes an auxiliary air blowing pipe 2, a heat-conducting copper pipe 3, and a directional nozzle 4. The auxiliary air blowing pipe 2 is located on the side of the laser cutting head 1, or is fixed to the side of the laser cutting head 1 by a fixing seat as shown in the figure. One end of the auxiliary air blowing pipe 2 is used to connect to compressed air, or is connected to the air inlet hose of the compressed air source through a flange interface, or is connected to the air inlet hose of the compressed air source through a threaded sealing joint. The other end of the auxiliary air blowing pipe 2 is provided with a directional nozzle 4. The air outlet direction of the directional nozzle 4 is towards the laser cutting area, and gradually tapers towards the laser cutting area, forming a pointed nozzle to increase the exhaust volume. The laser cutting area refers to the cutting trajectory left by the laser cutting head after cutting the material or product. One end of the heat-conducting copper pipe 3 (not limited to a tube, but can also be a rod, heat-conducting rod, etc.) is attached and fixed to the heat source area of ​​the laser cutting head 1, or is fixed to the side of the laser cutting head 1 by a fixing seat as shown in the figure. Figure 2 , Figure 3As shown, the other end of the heat-conducting copper tube 3 is sealed and inserted into the auxiliary air blowing pipe 2 on the heating element embedded in the laser cutting head 1, so as to transfer the waste heat energy of the laser cutting head 1 to the auxiliary air blowing pipe and realize waste heat collection. The part of the heat-conducting copper tube 3 located inside the auxiliary air blowing pipe 2 is connected to a copper heat-conducting rod 5. The copper heat-conducting rod 5 can also be a variable diameter part of the heat-conducting copper tube 3, or its diameter is larger than the diameter of the heat-conducting copper tube 3, or its diameter is smaller than the diameter of the heat-conducting copper tube 3. The copper heat-conducting rod 5 extends along the axial direction of the auxiliary air blowing pipe 2, so as to release the collected waste heat to the auxiliary air blowing pipe 2 through the copper heat-conducting rod 5. Since the auxiliary air blowing pipe 2 is a pipe for inputting compressed air, the heat released into the auxiliary air blowing pipe 2 will preheat the gas. When the heated gas is blown to the laser cutting area through the directional nozzle 4 for slag removal, it can avoid the sudden shrinkage, cracking, and stress deformation of the high-temperature cutting area caused by low temperature.

[0020] In addition, the adaptive temperature control component includes a copper sleeve 6 fixedly fitted on the outer wall of the copper heat-conducting rod 5, and a heat-insulating expansion tube 7 movably fitted on the outer wall of the copper heat-conducting rod 5; one end of the heat-insulating expansion tube 7 is connected to the copper sleeve 6, and the other end can extend and retract along the axial direction of the copper heat-conducting rod 5; when the temperature of the laser cutting head 1 changes, the heat-insulating expansion tube 7 extends and retracts accordingly to adjust the effective heat exchange area between the copper heat-conducting rod 5 and the airflow flowing through the auxiliary air blowing pipe 2, so that the gas heat exchange changes according to the temperature control change of the laser cutting head 1; the compressed air flowing through the auxiliary air blowing pipe 2 forms a stable temperature micro-temperature airflow after heat exchange, and is blown towards the laser cutting area through the directional nozzle 4.

[0021] In use, the laser cutting device is installed at the processing station for parts production. First, the air inlet of the auxiliary air blowing pipe 2 is connected to the workshop's conventional compressed air to ensure that all components are tightly connected and leak-free. Then, the equipment is started to drive the laser cutting head 1 and perform laser cutting operations on the parts according to the cutting program. During operation, the laser cutting head 1 continuously generates waste heat in its internal laser generator and nozzle area. This waste heat accumulates in the heat source area of ​​the laser cutting head 1. Since one end of the heat-conducting copper pipe 3 is attached and fixed to this heat source area, the waste heat is quickly conducted through the heat-conducting copper pipe 3 to its end located inside the auxiliary air blowing pipe 2, and further transferred to the copper heat-conducting rod 5 connected to the heat-conducting copper pipe 3, causing the temperature of the copper heat-conducting rod 5 to rise synchronously.

[0022] A copper sleeve 6 is fixedly fitted onto the outer wall of the copper heat-conducting rod 5. The copper sleeve 6 quickly absorbs the heat transferred by the copper heat-conducting rod 5 and transfers the heat to the heat-insulating expansion tube 7 connected to one end of the copper sleeve 6. When the cutting power of the laser cutting head 1 is adjusted according to the thickness of the accessory plate, the waste heat it generates will also change accordingly, resulting in temperature fluctuations in the copper heat-conducting rod 5 and the copper sleeve 6. When the temperature rises and exceeds the expansion threshold of the heat-insulating expansion tube 7, the heat-insulating expansion tube 7 will extend along the axial direction of the copper heat-conducting rod 5 towards the air inlet end of the auxiliary air blowing pipe 2. During this process, the extended heat-insulating expansion tube 7 will gradually block the outer wall of the copper heat-conducting rod 5, thereby reducing the effective heat exchange area between the copper heat-conducting rod 5 and the compressed air flowing through the auxiliary air blowing pipe 2, reducing the heat absorbed by the compressed air, and preventing the airflow temperature from becoming too high. The airflow follows the laser cutting path and is blown towards the laser cutting area through the directional nozzle 4 to complete the slag removal operation. When the cutting power of the laser cutting head 1 decreases and the waste heat decreases, the temperatures of the copper heat-conducting rod 5 and the copper sleeve 6 will drop simultaneously. At this time, the thermal expansion tube 7 will automatically contract back to its initial position due to the temperature drop, gradually exposing the outer wall of the copper heat-conducting rod 5, increasing the effective heat exchange area between the copper heat-conducting rod 5 and the compressed air, ensuring that the compressed air can fully absorb the waste heat and avoid the airflow temperature from being too low. The compressed air flowing through the auxiliary air blowing pipe 2, through the controllable heat exchange with the copper heat-conducting rod 5, finally forms a stable micro-warm airflow. This micro-warm airflow is directed towards the laser cutting area through the directional nozzle 4 at the end of the auxiliary air blowing pipe 2, and works in conjunction with the central slag discharge air path of the laser cutting head 1 to complete the accessory cutting operation.

[0023] In this device, the gas blown out by the directional nozzle 4 varies with the cutting temperature of the laser cutting head 1. The core reason for this is to achieve a precise match between waste heat recovery and cutting quality: the cutting temperature of the laser cutting head 1 fluctuates with the cutting power and the thickness of the accessory plate. The higher the power and the thicker the plate, the higher the cutting temperature and the more waste heat is generated; conversely, the lower the cutting temperature and the less waste heat is generated. This device uses a heat-conducting copper pipe 3 and a copper heat-conducting rod 5 to conduct the waste heat corresponding to the cutting temperature to the thermal expansion tube 7 in real time. This causes the thermal expansion tube 7 to expand and contract synchronously with the temperature change, dynamically adjusting the effective heat exchange area between the copper heat-conducting rod 5 and the compressed air. As a result, the heat absorbed by the compressed air flowing through the auxiliary blowing pipe 2 changes synchronously with the cutting temperature. Finally, a slightly warm airflow adapted to the cutting temperature is blown out through the directional nozzle 4, avoiding excessive temperature that could cause slag buildup or adhesion in the molten pool.

[0024] The specific effects of this change are as follows: when the laser cutting head 1 has a high cutting temperature and generates a lot of waste heat, the temperature of the blown airflow increases accordingly, which can avoid defects such as cut shrinkage and micro-cracks caused by the sudden cooling of the high-temperature cutting area by the room-temperature airflow; when the cutting temperature is low and the waste heat is low, the temperature of the blown airflow decreases simultaneously, which can prevent slag adhesion and poor slag removal caused by excessive heating of the airflow by waste heat. At the same time, the airflow temperature adapts to the cutting temperature without the need for additional electronic control adjustment, achieving energy-free temperature control adjustment. This fully recovers and utilizes the waste heat from laser cutting, ensures the stability of micro-temperature slag blowing, and effectively improves the cut quality and processing accuracy of the parts.

[0025] This invention achieves energy-free recovery and utilization of waste heat from laser cutting. The waste heat generated during the operation of the laser cutting head 1 is originally redundant heat. This invention's device conducts this heat to the auxiliary air blowing pipe 2 through the heat-conducting copper pipe 3 and copper heat-conducting rod 5, preheating the compressed air flowing through it. No additional heating equipment is needed, reducing energy consumption in the parts production process and meeting the requirements of energy-saving production. This invention achieves automatic and stable adjustment of the auxiliary air blowing temperature through an adaptive temperature control component. The thermal expansion tube 7 automatically expands and contracts according to the temperature changes of the laser cutting head 1, dynamically adjusting the effective heat exchange area between the copper heat-conducting rod 5 and the compressed air. This results in a stable, slightly warm airflow after heat exchange. When performing slag removal operations on the cutting trajectory, this effectively avoids problems such as cut shrinkage, micro-cracks, and stress deformation caused by directly blowing room-temperature compressed air into the high-temperature cutting area. It also prevents excessively high blowing temperature and slag adhesion due to excessive waste heat, significantly improving the processing accuracy and cut quality of the parts. All components of this invention are integrated into the side of the laser cutting head 1, making it compact and adaptable to various laser cutting scenarios for parts, with strong practicality. In this invention, the copper heat-conducting rod 5 extends axially along the auxiliary air blowing pipe 2, allowing the compressed air to fully contact and exchange heat with the copper heat-conducting rod 5 during the flow process, thereby improving the temperature control accuracy; the directional nozzle 4 can accurately guide the micro-temperature airflow to the cutting area, ensuring heat exchange and protection effects and reducing the rework rate.

[0026] The copper heat-conducting rod 5 is coaxial with the auxiliary air blowing pipe 2, and an annular air passage space 8 is formed between the outer wall of the heat-insulating expansion pipe 7 and the inner wall of the auxiliary air blowing pipe 2, surrounding the copper heat-conducting rod 5.

[0027] The annular air passage space 8 provides a stable channel for the flow of compressed air, ensuring that the compressed air can flow evenly through the outer wall of the copper heat-conducting rod 5, achieving full contact and heat exchange with the copper heat-conducting rod 5, thereby ensuring that the temperature of the micro-temperature airflow output by the directional nozzle 4 is uniform and stable.

[0028] like Figure 4 , Figure 5As shown, the end of the copper heat-conducting rod 5 away from the end connected to the heat-conducting copper pipe 3 has an outwardly protruding sphere 9, which is close to the air inlet end of the auxiliary air blowing pipe 2. The sphere 9 is the primary part to receive the compressed gas, and its spherical contour reduces obstruction to the gas, ensuring that the gas can enter the annular air passage space 8 to complete heat exchange.

[0029] A slip ring 10 is connected to the end of the thermal expansion tube 7 away from the copper sleeve 6. The inner ring of the slip ring 10 slides and adapts to the outer wall of the copper heat-conducting rod 5. When the gas temperature inside the thermal expansion tube 7 changes with the waste heat of the laser cutting head 1, the slip ring 10 moves synchronously with the expansion and contraction of the thermal expansion tube 7, thereby driving the overall micro-adjustment of the position of the thermal expansion tube 7, ensuring the axial expansion and contraction stability of the thermal expansion tube 7, ensuring that the micro-temperature airflow can accurately act on the cutting area, and avoiding the problem of uneven temperature caused by airflow deviation.

[0030] The thermal expansion tube 7 is a bimetallic thermal expansion sleeve. The bimetallic thermal expansion sleeve possesses reversible deformation characteristics due to thermal expansion and contraction. When the temperature exceeds a set expansion threshold, it elongates axially; when the temperature drops, it automatically contracts and returns to its initial installation position, achieving adaptive reciprocating adjustment without additional driving components. This bimetallic thermal expansion sleeve is a mature standard component; its structure and working principle are publicly available in existing technologies. Commonly used in temperature detection and other fields, it primarily utilizes a composite of two metal materials with significantly different coefficients of thermal expansion to achieve the conversion between temperature and mechanical deformation. The specific principle is as follows: the bimetallic thermal expansion sleeve is made of two layers of metal sheets with different coefficients of thermal expansion bonded together (such as the outer layer being brass with a high coefficient of thermal expansion and the inner layer being alloy steel with a low coefficient of thermal expansion). When the temperature changes, the two metal layers elongate or contract at different rates, which in turn causes the sleeve to undergo axial expansion and contraction deformation. When the temperature rises, the outer high-expansion metal elongates more than the inner low-expansion metal, and the sleeve elongates axially as a whole. When the temperature drops, the two metal layers contract synchronously, and the sleeve automatically springs back to its initial state. No additional creative improvements are required, but when applied to this invention, it is suitable for use in auxiliary air blowing pipes 2 with smaller volumes.

[0031] The directional nozzle 4 is threadedly connected to the outlet end of the auxiliary air blowing pipe 2, and the outlet of the directional nozzle 4 is equipped with a guide slope, so that the micro-temperature protective airflow is blown out along the tangent direction of the laser cutting edge, avoiding direct impact on the cutting molten pool. Disassembly is convenient, facilitating subsequent cleaning, maintenance, or replacement of the directional nozzle 4. Simultaneously, the guide slope guides the flowing micro-temperature protective airflow, ensuring it is blown along the tangent direction of the laser cutting edge onto the cutting trajectory after cutting, guaranteeing accurate slag removal positioning.

[0032] A sealing ring 11 is provided at the insertion point of the heat-conducting copper tube 3 and the auxiliary air blowing tube 2. The sealing ring 11 is sleeved and fixed on the outer wall of the heat-conducting copper tube 3 and tightly fitted with the connection point of the through hole of the auxiliary air blowing tube 2 to prevent compressed air from leaking from the gap between the two.

[0033] The side of the laser cutting head 1 is provided with an assembly hole 12 corresponding to the air inlet end of the auxiliary air blowing pipe 2. A connecting pipe 13 is fixed in the assembly hole 12. The connecting pipe 13 extends upward and is provided with a connecting part. The air inlet end of the auxiliary air blowing pipe 2 passes upward into the assembly hole 12 and is fixedly connected to the connecting pipe 13.

[0034] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0035] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laser cutting device for parts manufacturing, characterized in that, The assembly includes a laser cutting head (1), a slag blowing pipeline assembly, and an adaptive temperature control assembly. The slag blowing pipeline assembly includes an auxiliary air blowing pipe (2), a heat-conducting copper pipe (3), and a directional nozzle (4). The auxiliary air blowing pipe (2) is located on the side of the laser cutting head (1), with one end for connecting to compressed air and the other end equipped with the directional nozzle (4). The outlet direction of the directional nozzle (4) is towards the laser cutting area. One end of the heat-conducting copper pipe (3) is fitted and fixed to the heat source area of ​​the laser cutting head (1), and the other end is sealed and inserted into the interior of the auxiliary air blowing pipe (2). The portion of the heat-conducting copper pipe (3) located inside the auxiliary air blowing pipe (2) is connected to a copper heat-conducting rod (5). The copper heat-conducting rod (5) runs along the auxiliary air blowing pipe. The axial extension of the air pipe (2); the adaptive temperature control component includes a copper sleeve (6) fixedly sleeved on the outer wall of the copper heat-conducting rod (5) and a heat-insulating expansion tube (7) movably sleeved on the outer wall of the copper heat-conducting rod (5); one end of the heat-insulating expansion tube (7) is connected to the copper sleeve (6), and the other end can extend and retract along the axial direction of the copper heat-conducting rod (5); when the temperature of the laser cutting head (1) changes, the heat-insulating expansion tube (7) extends and retracts accordingly to adjust the effective heat exchange area between the copper heat-conducting rod (5) and the airflow flowing through the auxiliary air blowing pipe (2); the compressed air flowing through the auxiliary air blowing pipe (2) forms a stable temperature micro-temperature airflow after heat exchange, and is blown towards the laser cutting area through the directional nozzle (4).

2. The laser cutting device for parts production according to claim 1, characterized in that, The copper heat-conducting rod (5) is coaxial with the auxiliary air blowing pipe (2), and an annular air passage space (8) is formed between the outer wall of the heat-insulating expansion pipe (7) and the inner wall of the auxiliary air blowing pipe (2) surrounding the copper heat-conducting rod (5).

3. The laser cutting device for parts production according to claim 2, characterized in that, The copper heat-conducting rod (5) has an outwardly protruding ball (9) at the end away from the end connected to the heat-conducting copper tube (3), and the ball (9) is close to the air inlet end of the auxiliary air blowing tube (2).

4. The laser cutting device for parts production according to claim 3, characterized in that, The end of the thermal expansion tube (7) away from the copper sleeve (6) is connected to a slip ring (10), and the inner ring of the slip ring (10) is slidably adapted to the outer wall of the copper heat-conducting rod (5).

5. The laser cutting device for parts production according to claim 4, characterized in that, The thermal expansion tube (7) is a bimetallic thermal expansion sleeve.

6. The laser cutting device for parts production according to claim 5, characterized in that, The directional nozzle (4) is threadedly connected to the outlet end of the auxiliary air blowing pipe (2), and the outlet of the directional nozzle (4) is provided with a guide slope so that the micro-temperature protective airflow is blown out along the tangent direction of the laser cutting edge, avoiding direct impact on the cutting molten pool.

7. The laser cutting device for parts production according to claim 6, characterized in that, A sealing ring (11) is provided at the insertion point of the heat-conducting copper tube (3) and the auxiliary air blowing tube (2). The sealing ring (11) is sleeved and fixed on the outer wall of the heat-conducting copper tube (3) and tightly fitted with the connection point of the through hole of the auxiliary air blowing tube (2) to prevent compressed air from leaking from the gap between the two.

8. The laser cutting device for parts production according to claim 7, characterized in that, The side of the laser cutting head (1) is provided with an assembly hole (12) corresponding to the air inlet end of the auxiliary air blowing pipe (2). A connecting pipe (13) is fixed in the assembly hole (12). The connecting pipe (13) extends upward and is provided with a connecting part. The air inlet end of the auxiliary air blowing pipe (2) passes upward into the assembly hole (12) and is fixedly connected to the connecting pipe (13).

9. The laser cutting device for parts production according to claim 8, characterized in that, The directional nozzle (4) is pointed and gradually tapers toward the laser cutting area.

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