Intelligent temperature control device and method for crank of precision warm forging press

Abstract

The present invention relates to the high-end equipment manufacturing industry, and specifically to an intelligent temperature control device and method for a crank of a precision warm forging press, including a crank shaft diameter cooling circulation system and an intelligent and precise temperature control system. The crank shaft diameter cooling circulation system directly and precisely cools the crank shaft diameter heat source of high-frequency forging operations by setting cooling holes on the crank and setting an air intake path on the crankshaft or connecting rod; the intelligent and precise temperature control system uses temperature sensors, air coolers, solenoid valves, and PLC controllers to intelligently control the temperature rise of the crank shaft diameter, thereby reducing the thermal variables and thus reducing the matching clearance. The structural scheme of the present invention is unique, and has the characteristics of intelligent green manufacturing that significantly improves the operating accuracy, efficiency, and reliability of the transmission system. The product accuracy is more than 70% higher than the national standard, the crankshaft rotation speed is increased by 50-60%, and the service life of the connecting rod bearing is extended by more than 50%, achieving the remarkable effects of high precision, high-speed rotation, and precise intelligent temperature control of the precision warm forging press and its automated production line.

Description

Technical field:

[0001] The present invention relates to the technical field of high-end equipment manufacturing industry, and in particular to an intelligent temperature control device and method for a crank of a precision warm forging press. Background technology:

[0002] At present, the existing mechanical press structure is as follows Figure 8 As shown, it includes a fuselage, mounting through holes are arranged on both sides of the upper part of the fuselage, a first support sleeve and a second support sleeve are respectively arranged in the mounting through holes, the support sleeve is fixed to the fuselage by bolts, a bearing is arranged in the support sleeve, a crankshaft is arranged in the inner hole of the bearing, a connecting rod bearing is arranged on the outer side of the crank in the middle of the crankshaft, a connecting rod cap and a connecting rod inner hole are arranged on the connecting rod bearing, and the connecting rod bearing, the connecting rod cap and the connecting rod are fixed together by double-headed screws and nuts.

[0003] During operation, the connecting rod, connecting rod cap and connecting rod bearing reciprocate up and down with the rotation of the crankshaft. The crankshaft and connecting rod bearing form a sliding friction pair and rotate relative to each other. The relative rotation of the crankshaft and the connecting rod bearing under the action of the working force causes the extrusion friction, which causes the temperature of the crankshaft and the connecting rod bearing to continue to rise. The crankshaft shaft diameter expands outward after being heated, causing the shaft diameter to become thicker. The connecting rod bearing expands inward after being heated, causing the hole diameter of the connecting rod bearing to shrink, which in turn causes the matching clearance between the crankshaft shaft diameter and the connecting rod bearing to gradually decrease. After the matching clearance between the crankshaft shaft diameter and the connecting rod bearing is reduced, on the one hand, it seriously restricts the matching accuracy and rotation speed of the transmission system of the precision warm forging press to be greatly improved; on the other hand, it will also cause the crankshaft and the connecting rod bearing to wear quickly, be damaged, or lock and stop accidents.

[0004] The existing above-mentioned structure can basically meet the requirements for mechanical presses with low crankshaft speed or low precision performance index requirements, but it cannot meet the high performance requirements of high-speed, precision operation, stability and reliability for high-speed, precision warm forging presses and their automated production lines. With the continuous innovation of technology, some technical problems have been initially improved, but through actual application results, it is found that there are other deep-seated key technical problems that urgently need to be further applied in basic research to seek breakthroughs, such as the problem of thermal expansion of the shaft diameter caused by the temperature rise of the crankshaft. Although the intelligent cooling of the cold air on the outside of the connecting rod bearing has solved the "neck-stuck" key technical constraints of the oil cooling patented technology of similar international products, the problem of temperature rise and expansion of the crankshaft shaft diameter has been restricting the further improvement of the accuracy and rotation speed (efficiency) of the crankshaft and connecting rod bearing transmission system (matching clearance). Therefore, how to create an intelligent control system for the temperature rise of the crankshaft shaft diameter of a precision warm forging press is still a key technical problem facing the current intelligent manufacturing that restricts the performance improvement of high-speed precision metal forming machine tools and intelligent equipment and urgently needs to be solved.

[0005] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention:

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to provide a precision warm forging press crank intelligent temperature control device and method, which has reasonable structural design, precise intelligent temperature control, significant temperature control effect, extended service life of connecting rod bearings, and significantly improved speed, precision, efficiency and reliability of the whole machine.

[0007] The present invention achieves the above-mentioned purpose by adopting the following technical solutions:

[0008] Intelligent temperature control device for the crank of precision warm forging press, including:

[0009] A crankshaft diameter cooling circulation system, comprising a plurality of cooling holes axially arranged on the crankshaft, the cooling holes being located on a side of the crankshaft away from the crankshaft axis, the plurality of cooling holes being spaced apart along the circumferential direction of the crankshaft, one end of the cooling hole being connected to a first cold air deflector, and the other end being connected to a second cold air deflector, the first cold air deflector and the second cold air deflector connecting all the cooling holes in an S-shaped series connection, the second cold air deflector being provided with exhaust holes, the crankshaft being provided with connecting rod bearings, the connecting rod bearings being provided on connecting rod caps and connecting rod inner holes, the first cold air deflector being connected to an intake air path A provided on the crankshaft and the crankshaft, or the cooling holes at the starting end being directly connected to an intake air path B provided on the connecting rod and the connecting rod bearings;

[0010] An intelligent precise temperature control system includes an air cooler, which is connected to a solenoid valve, which is connected to an intake air path A or an intake air path B through an intake pipe, and a temperature sensor is provided at the lower part of the connecting rod near the connecting rod bearing, and the temperature sensor is connected to a PLC controller, which is respectively connected to the air cooler and the solenoid valve.

[0011] The air intake path A includes a cooling air inlet hole A axially arranged on the crankshaft and a cooling ventilation hole A radially arranged on the crank throw. A rotating joint connected to the cooling air inlet hole A is provided at the end of the crankshaft. The rotating joint is connected to the air intake pipe. The cooling air inlet hole A is connected to the cooling ventilation hole A. The cooling ventilation hole A is connected to a first cold air deflector arranged on the crank throw.

[0012] The air intake path B includes a cooling air inlet hole B, and the cooling air inlet hole B is arranged on one side of the lower inner part of the connecting rod. The connecting rod is provided with a joint connected to the cooling air inlet hole B, and the joint is connected to the intake pipe. The connecting rod bearing is radially provided with a connecting rod bearing ventilation hole connected to the cooling air inlet hole B, and the inner wall of the connecting rod bearing is provided with a circular connecting rod bearing ventilation groove, one end of the connecting rod bearing ventilation groove is connected to the connecting rod bearing ventilation hole, and the other end is connected to the crank ventilation hole arranged on the crank, and the crank ventilation hole is directly connected to the cooling hole located at the starting end.

[0013] The crank is provided with mounting grooves on both sides, one of which is used to mount the first cold air deflector, and the other is used to mount the second cold air deflector.

[0014] The intelligent temperature control method for the crank of a precision warm forging press includes the intelligent temperature control device for the crank as described above. When the temperature rise measured by the temperature sensor reaches a set value, the PLC controller controls the air cooler and the solenoid valve to start working to deliver cold air. The temperature, flow rate and flow rate of the cold air can be intelligently adjusted according to the system setting parameters. The cold air in the intake pipe enters the cooling hole through the intake air path A or the intake air path B to quickly and intelligently control the temperature of the crank shaft diameter. When the temperature measured by the temperature sensor returns to the normal set value range, the PLC controller controls the air cooler and the solenoid valve to stop working.

[0015] The present invention adopts the above technical solution to bring the following beneficial effects:

[0016] Considering the important influencing factor of temperature rise on the matching accuracy of the crankshaft connecting rod transmission system, based on the application research of the basic theory of temperature control, an integrated technology system of gas path temperature control and temperature detection control under intelligent temperature control is established. Combining innovative structural design with PLC control integration technology, temperature data acquisition, data analysis, active warning and early intervention methods are adopted, and cold air is used as the cheapest cooling medium. When working, the variable frequency speed regulating air cooler and solenoid valve on the machine body are combined with the intelligent cooling system to set the optimized parameters to control and adjust the start and stop, flow, flow rate and temperature of each outlet. The cold air is directly input into the cooling hole of the crankshaft crankshaft to make it completely in direct contact, reducing the thermal temperature rise of high-speed movement under high-frequency forging operations, thereby reducing the temperature rise range of the crankshaft shaft diameter and reducing the restriction of thermal temperature rise on the improvement of the accuracy and efficiency of the crankshaft connecting rod transmission link. The structural innovation design of the crankshaft intelligent temperature control device significantly improves the matching accuracy and rotation speed between the crankshaft and the connecting rod bearing. The prior art (national standard) generally has a bearing temperature rise of 40°C, with a maximum temperature not exceeding 70°C. The invention's experiments and simulation predictions confirm that the innovative intelligent temperature control device technology effectively controls the temperature rise range of high-speed rotating connecting rod bearings within 10-30°C, with a maximum temperature not exceeding 50°C. The ratio of the connecting rod bearing and crankshaft shaft diameter rotational motion clearance to the shaft diameter is optimized and reduced from 8 to 10 / 1000000 in the prior art to 4 to 5 / 1000000. The product precision is more than 70% higher than the national standard, and the crankshaft rotation speed is increased by 50 to 60%, significantly improving the accuracy, efficiency and reliability of the entire machine and extending the service life of the connecting rod bearing by more than 50%. Description of the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the crank intelligent temperature control device according to Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the air intake path A of Example 1 of the present invention;

[0019] Figure 3 This is a side view of the crank intelligent temperature control device of Example 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the crank intelligent temperature control device according to Embodiment 2 of the present invention;

[0021] Figure 5 This is a schematic structural diagram of the air intake path B of the second embodiment of the present invention;

[0022] Figure 6 for Figure 5 A partial enlarged view of part A;

[0023] Figure 7 It is a side view of the crank intelligent temperature control device of embodiment 2 of the present invention;

[0024] Figure 8 It is a structural schematic diagram of an existing mechanical press;

[0025] In the figure, 1. crank, 2. cooling hole, 3. crankshaft, 4. first cold air deflector, 5. second cold air deflector, 6. exhaust hole, 7. connecting rod bearing, 8. connecting rod cover, 9. connecting rod, 10. air intake path A, 1001. cooling air inlet hole A, 1002. cooling ventilation hole A, 1003. rotary joint, 11. air intake path B, 1101. cooling air inlet hole B, 1102. joint, 1103. connecting rod bearing ventilation hole, 1104. connecting rod bearing ventilation groove, 1105. crank ventilation hole, 12. air cooler, 13. solenoid valve, 14. air intake pipe, 15. temperature sensor, 16. mounting groove, 17. bearing, 18. fuselage. Specific implementation method:

[0026] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0028] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0029] In the present invention, the terms "axial", "radial", "circumferential", "A", "B", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the position of the indicated technical features.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "provided with", "set", "connected", "connected" and the like should be understood in a broad sense. For example, "provided with" and "set" can mean fixed installation, detachable installation, or integrated; "connected" can mean direct connection or connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1

[0032] like Figure 1-3 As shown, the intelligent temperature control device of the crank of the precision warm forging press includes:

[0033] The crankshaft diameter cooling circulation system includes a plurality of cooling holes 2 axially arranged on the crankshaft 1, wherein the cooling hole 2 is located on the side of the crankshaft 2 away from the axis of the crankshaft 3 (during the forging process of the precision warm forging press, when the connecting rod repeatedly moves up and down to the nominal pressure angle range close to the bottom dead center, the outer cylindrical side surface of the crankshaft 1 begins to be subjected to the extrusion force, and the closer to the bottom dead center, the greater the relative pressure between the outer side of the crankshaft 1 and the sliding contact surface of the lower part of the connecting rod bearing 7. In actual tests, the friction between the outer side of the crankshaft 1 and the lower contact surface of the connecting rod bearing 4 is the source of heat. Therefore, the present application sets the cooling hole 2 at the heat source on the crankshaft 1 to perform precision Cooling, the cooling effect is twice the result with half the effort), a plurality of cooling holes 2 are arranged at intervals along the circumferential direction of the crank 1, one end of the cooling hole 2 is connected to a first cold air deflector 4, and the other end is connected to a second cold air deflector 5, the first cold air deflector 4 and the second cold air deflector 5 connect all the cooling holes 2 in an S-shaped series connection (forming a circulating cooling channel), the second cold air deflector 5 is provided with an exhaust hole 6, the crank 1 is provided with a connecting rod bearing 7, the connecting rod bearing 7 is arranged on the inner hole of the connecting rod cover 8 and the connecting rod 9, the first cold air deflector 4 is connected with the intake air path A10 arranged on the crankshaft 3 and the crank 1;

[0034] The intelligent precise temperature control system comprises an air cooler 12, wherein the air cooler 12 is connected to a solenoid valve 13, wherein the solenoid valve 13 is connected to an intake air path A10 via an intake pipe 14, and a temperature sensor 15 is provided at the lower part of the connecting rod 9 near the connecting rod bearing 7, wherein the temperature sensor 15 is connected to a PLC controller, and the PLC controller is respectively connected to the air cooler 12 and the solenoid valve 13. Considering the important influencing factor of temperature rise on the matching accuracy of the crankshaft 1 connecting rod 9 transmission system, based on the application research of the basic theory of temperature control, an integrated technology system of gas path temperature control and temperature detection control under intelligent temperature control is established. Combining innovative structural design with PLC control integration technology, temperature data acquisition, data analysis, active warning and early intervention methods are adopted, and cold air is used as the cheapest cooling medium. When working, the variable frequency speed regulating air cooler 12 and solenoid valve 13 on the fuselage 18 are combined with the intelligent cooling system to set the optimized parameters to control and adjust the start and stop, flow rate, flow rate and temperature of each outlet. The cold air is directly input into the cold air circulation channel (intake air path and cooling hole) of the crankshaft 3 crank 1, so that it is completely in direct contact, reducing the thermal temperature rise of high-speed movement under high-frequency forging operation, thereby reducing the temperature rise range of the crankshaft 1 shaft diameter and reducing the restriction of thermal temperature rise on the improvement of the accuracy and efficiency of the crankshaft 1 connecting rod 9 transmission link. In practical applications, if the connecting rod bearing intelligent temperature control system can be used, the crankshaft and bearing bearing can be more effectively cooled in an intelligent, fast and accurate manner. The structural innovation design of the crankshaft intelligent temperature control system significantly improves the matching accuracy and rotation speed between the crankshaft 1 and the connecting rod bearing 4. The existing technology (national standard) bearing 17 generally has a temperature rise of 40°C, and the maximum temperature does not exceed 70°C. The experimental and simulation prediction of the present invention confirms that the innovative intelligent temperature control system technology effectively controls the temperature rise range of the high-speed rotating connecting rod bearing within 10-30°C, and the maximum temperature does not exceed 50°C. The ratio of the rotary motion clearance of the connecting rod bearing and the crankshaft shaft diameter is optimized from 8 to 10 / 1000000 in the existing technology to 4 to 5 / 1000000. The product accuracy is more than 70% higher than the national standard, and the crankshaft rotation speed efficiency is increased by 50 to 60%, which significantly improves the accuracy, efficiency and reliability of the whole machine, and extends the service life of the connecting rod bearing 7 by more than 50%.

[0035] The air intake path A10 includes a cooling air intake hole A1001 axially arranged on the crankshaft 3 and a cooling ventilation hole A1002 radially arranged on the crank 2. The end of the crankshaft 3 is provided with a rotary joint 1003 connected to the cooling air intake hole A1001. The rotary joint 1003 is connected to the air intake pipe 14. The cooling air intake hole A1001 is connected to the cooling ventilation hole A1002. The cooling ventilation hole A1003 is connected to the first cold air deflector 4 arranged on the crank 1. A specific implementation method of the air intake path is given to ensure that cold air quickly enters the cooling hole 2 for circulation cooling in a sealed state.

[0036] The crank 1 is provided with mounting grooves 16 on both sides, one of which is used to mount the first cold air deflector 4, and the other is used to mount the second cold air deflector 5, so as to achieve reliable mounting of the first cold air deflector 4 and the second cold air deflector 5.

[0037] Example 2

[0038] like Figure 4-7 As shown, the difference between this embodiment and embodiment 1 is that:

[0039] The cooling hole 2 at the starting end is directly connected to an intake air path B11 provided on the connecting rod 9 and the connecting rod bearing 7 , and the intake air path B11 is connected to the intake pipe 14 .

[0040] The air intake path B11 includes a cooling air intake hole B1101, which is arranged on one side of the lower inner part of the connecting rod 9. The connecting rod 9 is provided with a joint 1102 connected to the cooling air intake hole B1101, and the joint 1102 is connected to the air intake pipe 14. The connecting rod bearing 7 is radially provided with a connecting rod bearing ventilation hole 1103 connected to the cooling air intake hole B1101. The inner wall of the connecting rod bearing 7 is provided with an annular connecting rod bearing ventilation groove 1104. One end of the connecting rod bearing ventilation groove 1104 is connected to the connecting rod bearing ventilation hole 1103, and the other end is connected to the crank ventilation hole 1105 arranged on the crank 1. The crank ventilation hole 1105 is connected to the cooling hole 2 at the starting end. Another implementation method of the air intake path is given, which realizes the simultaneous cooling of the crank 1 shaft diameter and the connecting rod bearing 7 related to the heat source.

[0041] The intelligent temperature control method for the crank of a precision warm forging press includes the intelligent temperature control device for the crank as described above. When the temperature rise measured by the temperature sensor 15 reaches the set value, the PLC controller controls the air cooler 12 and the solenoid valve 13 to start the work of delivering variable cold air. The cold air in the air intake pipe 14 enters the cooling hole 2 through the air intake path A10 or the air intake path B11 to quickly and intelligently control the temperature of the crank 1. When the temperature measured by the temperature sensor 15 returns to the normal set value range, the PLC controller controls the air cooler 12 and the solenoid valve 13 to stop working. The present invention solves the problem that the thermal expansion of the crank caused by the continuous temperature rise caused by the high-speed rotation friction between the shaft and the bearing of the precision warm forging press seriously restricts the improvement of the matching accuracy and rotation speed of the transmission system, avoids the rapid wear or damage of the connecting rod bearing 7, prolongs the service life of the connecting rod bearing 7, effectively improves the movement speed, accuracy, production efficiency and processed product quality of the precision warm forging press, and realizes an effective breakthrough in the core key technologies of the precision warm forging press and its automated production line in efficient, precise, intelligent and green manufacturing.

[0042] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0043] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Intelligent temperature control device for crank of precision warm forging press, characterized in that: include: A crankshaft diameter cooling circulation system, comprising a plurality of cooling holes axially arranged on the crankshaft, the cooling holes being located on a side of the crankshaft away from the crankshaft axis, the plurality of cooling holes being spaced apart along the circumferential direction of the crankshaft, one end of the cooling hole being connected to a first cold air deflector, and the other end being connected to a second cold air deflector, the first cold air deflector and the second cold air deflector connecting all cooling holes in an S-shaped series connection, the second cold air deflector being provided with exhaust holes, the crankshaft being provided with connecting rod bearings, the connecting rod bearings being provided on connecting rod caps and connecting rod inner holes, the first cold air deflector being connected with an intake air path A provided on the crankshaft and the crankshaft, or the cooling holes at the starting end being directly connected with an intake air path B provided on the connecting rod and the connecting rod bearings; An intelligent precise temperature control system includes an air cooler, which is connected to a solenoid valve, which is connected to an intake air path A or an intake air path B through an intake pipe, and a temperature sensor is provided at the lower part of the connecting rod near the connecting rod bearing, and the temperature sensor is connected to a PLC controller, which is respectively connected to the air cooler and the solenoid valve.

2. The intelligent temperature control device for the crank of a precision warm forging press according to claim 1 is characterized in that: The air intake path A includes a cooling air inlet hole A axially arranged on the crankshaft and a cooling ventilation hole A radially arranged on the crank throw. A rotating joint connected to the cooling air inlet hole A is provided at the end of the crankshaft. The rotating joint is connected to the air intake pipe. The cooling air inlet hole A is connected to the cooling ventilation hole A. The cooling ventilation hole A is connected to a first cold air deflector arranged on the crank throw.

3. The intelligent temperature control device for the crank of a precision warm forging press according to claim 1 is characterized in that: The air intake path B includes a cooling air inlet hole B, and the cooling air inlet hole B is arranged on one side of the lower inner part of the connecting rod. The connecting rod is provided with a joint connected to the cooling air inlet hole B, and the joint is connected to the air intake pipe. The connecting rod bearing is radially provided with a connecting rod bearing ventilation hole connected to the cooling air inlet hole B, and the inner wall of the connecting rod bearing is provided with a circular connecting rod bearing ventilation groove, one end of the connecting rod bearing ventilation groove is connected to the connecting rod bearing ventilation hole, and the other end is connected to the crank ventilation hole arranged on the crank, and the crank ventilation hole is connected to the cooling hole located at the starting end.

4. Intelligent temperature control method for crank of precision warm forging press, characterized in that: The intelligent temperature control device for the crankshaft comprises the device according to any one of claims 1 to 3. When the temperature rise measured by the temperature sensor reaches the set value, the PLC controller controls the air cooler and the solenoid valve to start working to deliver variable cold air. The temperature, flow rate and flow rate of the cold air can be intelligently adjusted according to the system setting parameters. The cold air in the intake pipe enters the cooling hole through the intake air path A or the intake air path B to quickly and intelligently control the temperature of the crankshaft diameter. When the temperature measured by the temperature sensor returns to the normal set value range, the PLC controller controls the air cooler and the solenoid valve to stop working.

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