High-precision high-pressure oil film anti-lock screw-down screw thread and grinding machining method of high-precision high-pressure oil film anti-lock screw-down screw thread

Abstract

The invention discloses a high-precision high-pressure oil film anti-lock screw thread and a grinding machining method thereof.The high-precision high-pressure oil film anti-lock screw thread comprises a thread pressure-bearing working face, a thread face wavy face and a lubricating oil film, the thread pressure-bearing working face has roughness in the radial direction, the roughness is Ra0.8, the thread face wavy face is ground on the thread pressure-bearing working face, and the lubricating oil film is arranged on the thread pressure-bearing working face. The tooth surface wave surface is a concave-convex surface which is ground along the peripheral generatrix track direction of the screw tooth pressure-bearing working surface, is uniformly distributed and is in a weak wave shape; and the tooth surface wave surface forms a lubricating oil film on the concave surface when the screw and nut pair relatively moves. According to the device, under the high-bearing and high-pressure state of equipment such as a rolling mill, screw threads of a screw are pressed down to have high roughness, the friction coefficient is reduced, a high-pressure lubricating film can be generated to prevent the screw thread face from being locked due to the problems such as vacuum and the like, and it is guaranteed that large equipment such as the rolling mill runs safely.

Description

Technical Field

[0001] The present invention relates to the technical field, and specifically to a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw and a grinding processing method thereof. Background Art

[0002] The steel and non-ferrous metal manufacturing industry is the foundation of the national economy and a direction indicator of the country's manufacturing capacity. Metallurgical rolling mills are important main equipment for steel and non-ferrous metal production, and screw-down screws are key core components on rolling mills.

[0003] The defects existing in the existing screw threads of screw-down screws are as follows: 1. Patent document CN104853880A discloses a grinding processing method, "by controlling a feed table that reciprocally moves a grinding tool relative to a workpiece, and causing the grinding tool and the workpiece to rotate while contacting via a non-cutting movement that can achieve safe contact, thereby grinding the surface of the workpiece. After grinding the workpiece to the machining target position, when returning the position of the grinding tool, when it becomes a state where the mechanical elastic deformation included in the displacement of the feed table can be ignored, measure the position or displacement amount of the feed table, calculate a correction value for the non-cutting start position based on the position or displacement amount of the feed table, and correct the next non-cutting start position based on the correction value", but the existing screw threads of screw-down screws cannot reduce the phenomenon of the screw and nut being locked during the rolling process of the rolling mill, making the rolling production of the rolling mill unsafe, unstable, and discontinuous; 2. Patent document CN108284353A discloses a grinding processing device and a grinding processing method, "The grinding processing device includes: a grinding wheel side vibration displacement calculation device that calculates the vibration displacement of the grinding wheel caused by vibration in the approaching and separating direction due to the imbalance of the grinding wheel around the rotation axis; a spindle side vibration displacement calculation device that calculates the vibration displacement of the workpiece caused by the vibration of the grinding wheel in the approaching and separating direction propagating from the grinding wheel base to the bed; a relative vibration displacement calculation unit that calculates the relative vibration displacement between the grinding wheel and the workpiece based on the calculated vibration displacement of the grinding wheel and the vibration displacement of the workpiece; a position change unit that generates a position change command for changing the position of the grinding wheel base based on the calculated relative vibration displacement between the grinding wheel and the workpiece; and a processing control unit that performs grinding processing of the workpiece based on the generated position change command", but the existing screw threads of screw-down screws cannot reduce the phenomenon of the screw and nut being locked during the rolling process of the rolling mill, making the rolling production of the rolling mill unsafe, unstable, and discontinuous. Summary of the Invention

[0004] The object of the present invention is to provide a high-precision high-pressure oil film anti-lockdown screw thread for a screw-down screw and its grinding method, so as to solve the technical problems of the screw thread of the screw-down screw being unable to reduce the phenomenon of the screw and nut being locked during the rolling process of the rolling mill, resulting in the insecurity, instability and discontinuity of the rolling production of the rolling mill.

[0005] To achieve the above object, the present invention provides the following technical solution: A high-precision high-pressure oil film anti-lockdown screw thread for a screw-down screw, including a screw thread bearing working surface, a tooth surface wavy surface, and a lubricating oil film. The radial direction of the screw thread bearing working surface has a roughness of Ra0.8. A tooth surface wavy surface is ground on the screw thread bearing working surface. The tooth surface wavy surface is an unevenly distributed and weakly wavy concave-convex surface ground along the circumferential bus trajectory direction of the screw thread bearing working surface of the screw. The tooth surface wavy surface forms a lubricating oil film on the concave surface during the relative movement of the screw-nut pair.

[0006] Preferably, the lubricating oil film reduces the occurrence of accidents such as jamming or locking of the screw-down screw and nut during the operation of equipment such as rolling mills in a harsh environment of continuous high load and high pressure.

[0007] Preferably, the tooth surface wavy surface is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0001 - 0.0005 mm.

[0008] Preferably, the screw thread is processed by grinding. During grinding, the rotational linear velocity of the screw thread of the screw and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the screw thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel, the roughness of the screw thread bearing working surface is improved and the tooth surface wavy surface is formed. The improvement of the roughness reduces the friction coefficient, and the tooth surface wavy surface is a storage space for the high-pressure oil film.

[0009] Preferably, during the grinding process, the direction of the rotational linear velocity of the screw thread is opposite to the direction of the rotational linear velocity of the grinding wheel.

[0010] Preferably, during the grinding process, the rotational linear velocity of the screw thread of the screw is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 - 0.06 m / s.

[0011] Preferably, during the grinding process, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 30 - 35 m / s.

[0012] Preferably, after grinding, the tooth surface wavy surface on the screw thread bearing working surface of the screw has obvious wave patterns, the tooth surface wavy surface has no concave-convex feeling when touched by hand, and the roughness of the tooth surface wavy surface is Ra0.8.

[0013] Preferably, the experimental process of the rotational linear velocity of the screw thread of the screw is as follows; S1. Clamp the finely finished screw using the double center pin clamping method and fix it securely on the grinding machine. S2. Install and adjust the grinding wheel power head for grinding the screw threads in place.

[0014] S3. Use a diamond tool to grind the working surface angle of the grinding wheel to make it conform to the bearing working surface of the screw threads or the back support surface of the screw threads.

[0015] S4. Align the grinding wheel with the grinding surface of the screw threads on the grinding machine to find the dynamic grinding starting point.

[0016] S5. After finding the grinding starting point, rotate the grinding wheel normally to start trial grinding.

[0017] S6. After the trial grinding of the grinding wheel starts, determine the optimal linear speed of the screw threads by adjusting the linear speed of the rotation of the screw threads.

[0018] S7. During the trial grinding, the linear speed of the rotation of the screw threads starts from 0 and gradually accelerates. After each acceleration of 0.005 m / s, stop accelerating and make a record. Keep trial grinding and recording until the optimal parameters are obtained. Thereafter, fix the linear speed of the rotation of the screw threads and start normal grinding. The optimal parameters are 0.02 - 0.06 m / s.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By installing the present invention, when equipment such as rolling mills is in a high-load and high-pressure state, the screw threads of the screw-down have both a relatively high roughness to reduce the friction coefficient and can generate a high-pressure lubricating film to prevent problems such as vacuum on the screw thread surface and seizure, ensuring the safe operation of large equipment such as rolling mills. 2. By installing the present invention, a high-pressure oil film is formed between the wave crests and wave troughs. This high-pressure oil film ensures that when the screw-down screw nut pair moves, problems such as overheating due to lack of oil on the tooth surface or seizure or locking due to excessive smoothness of the bearing working surface of the screw nut screw threads and generation of vacuum will not occur, ensuring the reliable and stable operation of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the bearing working surface of the screw threads of the present invention; Figure 2 is a schematic structural diagram of the wavy tooth surface of the present invention; Figure 3 is a schematic structural diagram of the lubricating oil film of the present invention.

[0021] In the figure: 1. Bearing working surface of the screw threads; 3. Wavy tooth surface; 5. Lubricating oil film. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. Those of ordinary skill in the art can understand according to specific situations.

[0025] Example 1: Please refer to Figure 1 、 Figure 2 、 Figure 3, An embodiment provided by the present invention: A high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, including a screw thread bearing working surface 1, a tooth surface wavy surface 3, and a lubricating oil film 5. The radial direction of the screw thread bearing working surface 1 has a roughness of Ra0.8. The tooth surface wavy surface 3 is ground on the screw thread bearing working surface 1. The tooth surface wavy surface 3 is an unevenly distributed and weakly wavy concave-convex surface ground along the circumferential bus trajectory direction of the screw thread bearing working surface 1 of the screw. The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of the screw-down screw and nut being stuck or locked when equipment such as rolling mills operates in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0001 mm. The screw thread is processed by grinding. When grinding, the rotational linear velocity of the screw thread of the screw and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the screw thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel, the roughness of the screw thread bearing working surface 1 is improved and the tooth surface wavy surface 3 is formed. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the rotational linear velocity direction of the screw thread of the screw and the rotational linear velocity direction of the grinding wheel are in opposite directions. During grinding, the rotational linear velocity of the screw thread of the screw is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 30 m / s. After grinding, the tooth surface wavy surface 3 on the screw thread bearing working surface 1 of the screw has obvious wavy lines. The tooth surface wavy surface 3 has no concave-convex feeling when touched by hand. The roughness of the tooth surface wavy surface 3 is Ra0.8. The experimental process of the rotational linear velocity of the screw thread of the screw is as follows; S1. Clamp the screw that has been finely processed using the double center clamp method and fix it firmly on the grinding machine; S2. Install and adjust the grinding wheel power head for grinding the screw thread in place.

[0026] S3. Use a diamond tool to grind the working surface angle of the grinding wheel to make it conform to the screw thread bearing working surface 1 or the screw thread back support surface 2.

[0027] S4. Align the grinding wheel with the screw thread grinding surface on the grinding machine to find the dynamic grinding starting point.

[0028] S5. After finding the grinding starting point, rotate the grinding wheel normally to start trial grinding.

[0029] S6. After the trial grinding of the grinding wheel starts, determine the optimal linear velocity of the screw thread by adjusting the rotational linear velocity of the screw thread of the screw.

[0030] S7. During trial grinding, the rotational linear velocity of the screw thread starts from 0 and gradually accelerates. After each acceleration of 0.005 m / s, stop accelerating and make a record. Continuously conduct trial grinding and recording until the optimal parameters are obtained. Thereafter, fix the rotational linear velocity of the screw thread and start normal grinding. The optimal parameter is 0.02 m / s.

[0031] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 , an embodiment provided by the present invention: A high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, including a screw thread bearing working surface 1, a tooth surface wavy surface 3, and a lubricating oil film 5. The radial direction of the screw thread bearing working surface 1 has a roughness of Ra0.8. A tooth surface wavy surface 3 is ground on the screw thread bearing working surface 1. The tooth surface wavy surface 3 is an unevenly distributed and slightly wavy concave-convex surface ground along the circumferential bus trajectory direction of the screw thread bearing working surface 1 of the screw. The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces accidents such as jamming or locking of the screw-down screw and nut when equipment such as rolling mills operates in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0003 mm. The screw thread is processed by grinding. During grinding, the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel move in opposite directions. The rotational linear velocity of the screw thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel, the roughness of the screw thread bearing working surface 1 is improved and the tooth surface wavy surface 3 is formed. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the rotational linear velocity direction of the screw thread and the rotational linear velocity direction of the grinding wheel are opposite. During grinding, the rotational linear velocity of the screw thread is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.03 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 33 m / s. After grinding, the tooth surface wavy surface 3 on the screw thread bearing working surface 1 of the screw has obvious wavy lines. The tooth surface wavy surface 3 has no concave-convex feeling when touched by hand. The roughness of the tooth surface wavy surface 3 is Ra0.8. The experimental process of the rotational linear velocity of the screw thread is as follows; S1. Clamp the screw that has been finely processed using the double center support clamping method and fix it firmly on the grinding machine; S2. Install and adjust the grinding wheel power head for grinding the screw thread in place.

[0032] S3. Use a diamond tool to grind the working surface angle of the grinding wheel to make it conform to the screw thread bearing working surface 1 or the screw thread back support surface 2.

[0033] S4. Align the grinding wheel and the screw thread grinding surface on the grinding machine to find the dynamic grinding starting point.

[0034] S5. After finding the grinding starting point, rotate the grinding wheel normally and start trial grinding.

[0035] S6. After the trial grinding of the grinding wheel starts, determine the optimal linear speed of the thread by adjusting the linear speed of the screw thread rotation of the screw.

[0036] S7. During the trial grinding, the linear speed of the thread rotation starts to accelerate slowly from 0. After accelerating by 0.005 m / s each time, stop accelerating and make a record. Keep trial grinding and recording until the optimal parameters are obtained. After that, fix the linear speed of the thread rotation and start normal grinding. The optimal parameter is 0.03 m / s.

[0037] Example 3: Please refer to Figure 1 , Figure 2 , Figure 3 , an embodiment provided by the present invention: a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, including a thread bearing working surface 1, a tooth surface wavy surface 3, and a lubricating oil film 5. The radial direction of the thread bearing working surface 1 has a roughness of Ra0.8. A tooth surface wavy surface 3 is ground on the thread bearing working surface 1. The tooth surface wavy surface 3 is a uniformly distributed and weakly wavy concave-convex surface ground along the circumferential generatrix trajectory direction of the screw thread bearing working surface 1 of the screw. The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of jamming or locking of the screw-down screw and nut of equipment such as rolling mills operating in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0002 mm. The thread is processed by grinding. During grinding, the linear speed of the screw thread rotation and the linear speed of the grinding wheel rotation are in opposite directions. The linear speed of the thread rotation is an adjustable speed, and the linear speed of the grinding wheel rotation is a relatively fixed speed. By adjusting the difference in the relative movement speed generated by the linear speed of the thread rotation and the linear speed of the grinding wheel rotation, the improvement of the roughness of the thread bearing working surface 1 and the formation of the tooth surface wavy surface 3 are realized. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the direction of the linear speed of the thread rotation of the screw is opposite to the direction of the linear speed of the grinding wheel rotation. During grinding, the linear speed of the screw thread rotation is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 m / s. During grinding, the value of the linear speed of the grinding wheel rotation is selected as the safe linear speed, and the safe linear speed is 32 m / s. After grinding, the tooth surface wavy surface 3 on the thread bearing working surface 1 of the screw has obvious wave patterns. The tooth surface wavy surface 3 has no concave-convex feeling when touched by hand. The roughness of the tooth surface wavy surface 3 is Ra0.8. The experimental process of the linear speed of the screw thread rotation is as follows; S1. Clamp and fix the screw that has been finely processed by using the double center drill chuck method on the grinding machine; S2. Install and adjust the grinding wheel power head for grinding the thread in place.

[0038] S3. Use a diamond tool to grind the working surface angle of the grinding wheel to conform to the pressure-bearing working surface 1 of the screw thread or the back support surface 2 of the thread.

[0039] S4. Align the grinding wheel with the grinding surface of the screw thread on the grinding machine to find the dynamic grinding starting point.

[0040] S5. After finding the grinding starting point, rotate the grinding wheel normally to start trial grinding.

[0041] S6. After the trial grinding of the grinding wheel starts, determine the optimal linear speed of the thread by adjusting the rotational linear speed of the screw thread.

[0042] S7. When performing trial grinding, the rotational linear speed of the thread starts to accelerate slowly from 0. After accelerating by 0.005 m / s each time, stop accelerating and make a record. Keep performing trial grinding and recording until the optimal parameters are obtained. After that, fix the rotational linear speed of the thread and start normal grinding. The optimal parameter is 0.02 m / s.

[0043] Example 4: Please refer to Figure 1 , Figure 2 , Figure 3, an embodiment provided by the present invention: a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, including a screw thread bearing working surface 1, a tooth surface wavy surface 3, and a lubricating oil film 5. The radial direction of the screw thread bearing working surface 1 has a roughness of Ra0.8. A tooth surface wavy surface 3 is ground on the screw thread bearing working surface 1. The tooth surface wavy surface 3 is a uniformly distributed and slightly wavy concave-convex surface ground along the circumferential bus trajectory direction of the screw thread bearing working surface 1 of the screw. The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces accidents such as jamming or locking of the screw-down screw and nut when equipment such as rolling mills operates in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0004 mm. The screw thread is processed by grinding. When grinding, the rotational linear velocity of the screw thread of the screw and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the screw thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel, the roughness of the screw thread bearing working surface 1 is improved and the tooth surface wavy surface 3 is formed. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the rotational linear velocity direction of the screw thread of the screw and the rotational linear velocity direction of the grinding wheel are in opposite directions. During grinding, the rotational linear velocity of the screw thread of the screw is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.04 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 34 m / s. After grinding, the tooth surface wavy surface 3 on the screw thread bearing working surface 1 of the screw has obvious wavy lines. The tooth surface wavy surface 3 has no concave-convex feeling when touched by hand. The roughness of the tooth surface wavy surface 3 is Ra0.8. The experimental process of the rotational linear velocity of the screw thread of the screw is as follows; S1. Clamp the screw that has been finely processed using the double center drill clamping method and fix it firmly on the grinding machine; S2. Install and adjust the grinding wheel power head for grinding the screw thread in place.

[0044] S3. Use a diamond tool to grind the working surface angle of the grinding wheel to make it conform to the screw thread bearing working surface 1 or the screw thread back support surface 2.

[0045] S4. Align the grinding wheel with the grinding surface of the screw thread on the grinding machine and find the dynamic grinding starting point.

[0046] S5. After finding the grinding starting point, rotate the grinding wheel normally and start trial grinding.

[0047] S6. After the trial grinding of the grinding wheel starts, determine the optimal linear velocity of the screw thread by adjusting the rotational linear velocity of the screw thread of the screw.

[0048] S7. During trial grinding, the rotational linear velocity of the thread starts from 0 and accelerates slowly. After each acceleration of 0.005 m / s, stop accelerating and make a record. Keep trial grinding and recording until the optimal parameters are obtained. After that, fix the rotational linear velocity of the thread and start normal grinding. The optimal parameter is 0.04 m / s.

[0049] Comparative experiment: The difference between Comparative Example 1 and Example 1 is that; The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of the screw and nut of the rolling mill and other equipment being stuck or locked during operation in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is an uneven surface, and the peak-valley difference of the uneven surface is 0.0001 mm. The thread is processed by grinding. During grinding, the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the thread and the rotational linear velocity of the grinding wheel, the improvement of the roughness of the bearing working surface 1 of the thread and the formation of the tooth surface wavy surface 3 are realized. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the direction of the rotational linear velocity of the thread is opposite to the direction of the rotational linear velocity of the grinding wheel. During grinding, the rotational linear velocity of the screw thread is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 30 m / s.

[0050] The difference between Comparative Example 1 and Example 2 is that; The tooth surface wavy surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of the screw and nut of the rolling mill and other equipment being stuck or locked during operation in a harsh environment of continuous high load and high pressure. The tooth surface wavy surface 3 is an uneven surface, and the peak-valley difference of the uneven surface is 0.0003 mm. The thread is processed by grinding. During grinding, the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the thread and the rotational linear velocity of the grinding wheel, the improvement of the roughness of the bearing working surface 1 of the thread and the formation of the tooth surface wavy surface 3 are realized. The improvement of the roughness reduces the friction coefficient. The tooth surface wavy surface 3 is a storage space for the high-pressure oil film. During grinding, the direction of the rotational linear velocity of the thread is opposite to the direction of the rotational linear velocity of the grinding wheel. During grinding, the rotational linear velocity of the screw thread is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.03 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 33 m / s.

[0051] The difference between Comparative Example 1 and Example 3 is that; The wavy tooth surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of jamming or seizure of the screw and nut in equipment such as rolling mills operating in a harsh environment of continuous high load and high pressure. The wavy tooth surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0002 mm. The screw teeth are processed by grinding. During grinding, the rotational linear velocity of the screw teeth and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the screw teeth is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw teeth and the rotational linear velocity of the grinding wheel, the improvement of the roughness of the bearing working surface 1 of the screw teeth and the formation of the wavy tooth surface 3 are achieved. The improvement of the roughness reduces the friction coefficient. The wavy tooth surface 3 is a storage space for the high-pressure oil film. During grinding, the direction of the rotational linear velocity of the screw teeth is opposite to the direction of the rotational linear velocity of the grinding wheel. During grinding, the rotational linear velocity of the screw teeth is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 32 m / s.

[0052] The difference between Comparative Example 1 and Example 4 is that; The wavy tooth surface 3 forms a lubricating oil film 5 on the concave surface during the relative movement of the screw-nut pair. The lubricating oil film 5 reduces the accidents of jamming or seizure of the screw and nut in equipment such as rolling mills operating in a harsh environment of continuous high load and high pressure. The wavy tooth surface 3 is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0004 mm. The screw teeth are processed by grinding. During grinding, the rotational linear velocity of the screw teeth and the rotational linear velocity of the grinding wheel are in opposite directions. The rotational linear velocity of the screw teeth is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative movement speed difference generated by the rotational linear velocity of the screw teeth and the rotational linear velocity of the grinding wheel, the improvement of the roughness of the bearing working surface 1 of the screw teeth and the formation of the wavy tooth surface 3 are achieved. The improvement of the roughness reduces the friction coefficient. The wavy tooth surface 3 is a storage space for the high-pressure oil film. During grinding, the direction of the rotational linear velocity of the screw teeth is opposite to the direction of the rotational linear velocity of the grinding wheel. During grinding, the rotational linear velocity of the screw teeth is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.04 m / s. During grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 34 m / s.

[0053] The friction coefficient experiments and seizure rate experiments were respectively carried out on the screw teeth of the screw-down screws in Example 1, Example 2, Example 3, Example 4 and Example 5 of the present invention and the traditional screw-down screw teeth (Comparative Example 1), and their values were respectively calculated and statistically analyzed. The results are shown in the table;

[0054] As can be seen from the data in the table, the friction coefficients of the screw threads of the screw-down screws in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4 and Embodiment 5 of the present invention are 0.08, 0.09, 0.10, 0.011 respectively, which are significantly lower than the friction coefficient of the screw threads of the screw-down screws in Comparative Example 1. Therefore, it shows that the friction coefficient of the screw threads of the screw-down screws of the present invention has decreased significantly.

[0055] As can be seen from the data in the table, the seizure rates of the screw threads of the screw-down screws in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4 and Embodiment 5 of the present invention are 3, 4, 2, 4 respectively, which are significantly lower than the seizure rate of the screw threads of the screw-down screws in Comparative Example 1. Therefore, it shows that the seizure rate of the screw threads of the screw-down screws of the present invention has decreased significantly. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed claim.

Claims

1. A high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, comprising a screw thread bearing working surface (1), a tooth surface wavy surface (3), and a lubricating oil film (5), characterized in that: The radial direction of the thread bearing working surface (1) has a roughness of Ra0.

8. A tooth surface wavy surface (3) is ground on the thread bearing working surface (1). The tooth surface wavy surface (3) is a uniformly distributed and weakly wavy concave-convex surface ground along the peripheral bus trajectory direction of the screw thread bearing working surface (1). When the screw-nut pair moves relative to each other, a lubricating oil film (5) is formed on the concave surface of the tooth surface wavy surface (3).

2. The high-precision high-pressure oil film anti-lockdown screw thread according to claim 1, characterized in that: The lubricating oil film (5) reduces accidents such as jamming or seizure of the screw and nut of rolling mills and other equipment operating in harsh environments with continuous high loads and high pressures.

3. A high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw according to claim 1, characterized in that: The tooth surface wavy surface (3) is a concave-convex surface, and the peak-valley difference of the concave-convex surface is 0.0001 - 0.0005 mm.

4. A processing method for the thread of a high-precision high-pressure oil film anti-lock down screw, which is applicable to the thread of a high-precision high-pressure oil film anti-lock down screw described in any one of claims 1-3, and is characterized in that: The thread is processed by grinding. When grinding, the rotational linear velocity of the screw thread and the rotational linear velocity of the grinding wheel move in opposite directions. The rotational linear velocity of the thread is an adjustable speed, and the rotational linear velocity of the grinding wheel is a relatively fixed speed. By adjusting the relative motion speed difference between the rotational linear velocity of the thread and the rotational linear velocity of the grinding wheel, the roughness of the thread bearing working surface (1) is improved and the tooth surface wavy surface (3) is formed. The improvement of the roughness reduces the friction coefficient, and the tooth surface wavy surface (3) is a storage space for the high-pressure oil film.

5. A processing method for the high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, according to claim 4, characterized in that: When grinding, the direction of the rotational linear velocity of the thread is opposite to the direction of the rotational linear velocity of the grinding wheel.

6. A processing method for a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, according to claim 4, characterized in that: When grinding, the rotational linear velocity of the screw thread is used as an adjustment parameter for the relative grinding speed during grinding, and this parameter is 0.02 - 0.06 m / s.

7. A processing method for a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, according to claim 4, characterized in that: When grinding, the value of the rotational linear velocity of the grinding wheel is selected as the safe linear velocity, and the safe linear velocity is 30 - 35 m / s.

8. A processing method for the high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, according to claim 4, characterized in that: After grinding, the tooth surface wavy surface (3) on the screw thread bearing working surface (1) has obvious wavy lines. The tooth surface wavy surface (3) has no concave-convex feeling when touched by hand, and the roughness of the tooth surface wavy surface (3) is Ra0.

8.

9. A processing method for a high-precision high-pressure oil film anti-lockdown screw thread of a screw-down screw, according to claim 6, characterized in that: The experimental process of the rotational linear velocity of the screw thread is as follows; S1. Clamp the screw that has been finely processed using the double center clamp method and fix it firmly on the grinding machine; S2. Install and adjust the grinding wheel power head for grinding the thread in place; S3. Use a diamond tool to grind the working surface angle of the grinding wheel to make it conform to the thread bearing working surface (1) or the thread back support surface; S4. Align the grinding wheel with the screw thread grinding surface on the grinding machine and find the dynamic grinding starting point; S5. After finding the grinding starting point, rotate the grinding wheel normally and start trial grinding; S6. After the grinding wheel starts trial grinding, determine the optimal linear velocity of the thread by adjusting the rotational linear velocity of the screw thread; S7. During trial grinding, the rotational linear velocity of the thread starts to accelerate slowly from 0. After accelerating by 0.005 m / s each time, stop accelerating and make a record. Keep trial grinding and recording until the best parameters are obtained. After that, fix the rotational linear velocity of the thread and start normal grinding. The best parameters are 0.02 - 0.06 m / s.

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