CN-114939680-B - Compact parallel driving type double-clamping-disc lathe spindle system

CN114939680BCN 114939680 BCN114939680 BCN 114939680BCN-114939680-B

Abstract

The invention discloses a compact parallel driving type double-clamping-disc lathe spindle system which comprises a driving spindle servo motor, a spindle box body, a clamping chuck A, a clamping chuck B, a spindle and an auxiliary spindle, wherein the spindle and the auxiliary spindle are of hollow shaft structures, 3 sealing cavity structures Q1, Q2 and Q3 are formed by the right hydraulic cylinder pull rod (16), the left hydraulic cylinder pull rod (17) and the left screw sleeve (19), oil inlet holes T1, T2 and T3 which are correspondingly communicated with sealing cavities are arranged on a spindle (5), a hydraulic control system is matched with the spindle system, actions of the clamping chuck A (3) and the clamping chuck B (12) are realized by controlling the volumes of hydraulic oil in the 3 sealing cavities, and clamping damage on the surface of a workpiece is prevented by raising the hydraulic oil in stages. The invention has simple structure and convenient and reliable control, can obtain stable and reliable positioning and clamping long shaft parts, avoid clamping deformation of workpieces and improve the processing quality.

Inventors

KANG CHUANYONG
Kang zhengyang
WANG MULAN
YIN JUN
FANG KE

Assignees

南京钛康数控技术有限公司
南京钛康数控技术有限公司

Dates

Publication Date: 20260421
Application Date: 20220613
Priority Date: 20220613

Claims (8)

1. The compact parallel driving type double-clamping-disc lathe spindle system is characterized by comprising a spindle servo motor (1), a spindle box body (2), a clamping chuck A (3) and a clamping chuck B (12), a spindle (5) and a secondary spindle (11); The main shaft servo motor (1) is arranged on the main shaft box body (2), the tail end of the main shaft servo motor is connected with a straight bevel gear (14), the straight bevel gear (14) is meshed with a bevel gear (7) arranged on the main shaft (5), and the bevel gear (7) is fixed on the main shaft through a locking nut (8); The main shaft (5) is fixedly connected with the auxiliary main shaft (11) through a flat key A (20) and penetrates through the main shaft box body (2), and a clamping chuck A (3), a main shaft receiving disc A (4), a main shaft right flange (6), a tapered roller bearing A (18), a bevel gear (7), a locking nut (8), an oil distributing sleeve (9), a tapered roller bearing B (15), a main shaft left flange (10), a main shaft receiving disc B (13) and a clamping chuck B (12) are sequentially arranged from one side of the main shaft to one side of the auxiliary main shaft; The main shaft (5) and the auxiliary main shaft (11) are of hollow shaft structures, and form a sealing cavity Q1, a sealing cavity Q2 and a sealing cavity Q3 together with a right hydraulic cylinder pull rod (16), a left hydraulic cylinder pull rod (17) and a left screw sleeve (19), wherein an oil inlet and outlet hole T1, an oil inlet and outlet hole T2 and an oil inlet and outlet hole T3 which are correspondingly communicated with the sealing cavity are formed in the main shaft (5); The contact end of the sealing cavity Q1 and the left threaded sleeve (19) is provided with a bone-shaped sealing ring A (22), the contact end of the sealing cavity Q2 and the left hydraulic cylinder pull rod (17) is provided with a bone-shaped sealing ring B (23), and the contact end of the sealing cavity Q3 and the main shaft (5) is provided with a bone-shaped sealing ring C (24); an O-shaped sealing ring A (25) is arranged at the inner side of the left threaded sleeve (19) matched with the main shaft (5), an O-shaped sealing ring B (26) is arranged at the inner side of the left hydraulic cylinder pull rod (17) matched with the main shaft (5), and an O-shaped sealing ring C (27) is arranged at the inner side of the right hydraulic cylinder pull rod (16) matched with the main shaft (5); the hydraulic oil enters the sealing cavity from the oil inlet and outlet hole so as to drive the left hydraulic cylinder pull rod (17) and the right hydraulic cylinder pull rod (16) to act in parallel, and the left hydraulic cylinder pull rod (17) and the right hydraulic cylinder pull rod (16) are respectively connected with the clamping chuck A (3) and the clamping chuck B (12), so that the clamping and the loosening of the clamping chuck are realized.
2. The compact parallel driving type double-chuck lathe spindle system according to claim 1, wherein the power source for driving the right hydraulic cylinder pull rod (16) and the left hydraulic cylinder pull rod (17) to axially move is hydraulic or pneumatic, and the movement distance of the right hydraulic cylinder pull rod (16) and the left hydraulic cylinder pull rod (17) is 5-50mm.
3. The compact parallel driving type double-chuck lathe spindle system according to claim 2, wherein if a power source for driving the right hydraulic cylinder pull rod (16) and the left hydraulic cylinder pull rod (17) to axially move is hydraulic, liquid pressure sensors are arranged in the sealing cavity Q1, the sealing cavity Q2 and the sealing cavity Q3, liquid pressure in the sealing cavity Q2 is controlled to rise in stages in the clamping process of the clamping chuck by the aid of the liquid pressure sensors, the hydraulic oil pressure in the sealing cavity Q2 is 70-85% of the final clamping pressure before the clamping chuck completely clamps a workpiece, and the hydraulic oil pressure in the sealing cavity Q2 is raised to the final clamping pressure when the clamping chuck clamps the workpiece.
4. The compact parallel driving type double-chuck lathe spindle system according to claim 2, wherein if a power source for driving the right hydraulic cylinder pull rod (16) and the left hydraulic cylinder pull rod (17) to axially move is air pressure, air pressure sensors are arranged in the sealing cavity Q1, the sealing cavity Q2 and the sealing cavity Q3, air is an air-air mixture mixed with tiny lubricating oil drops, the air pressure in the sealing cavity Q2 is controlled in the clamping process of the clamping chuck by utilizing an air pressure control system, and after the clamping chuck clamps a workpiece, the air pressure in the sealing cavity Q2 is further improved by 50-200%.
5. The compact parallel driving type double-chuck lathe spindle system of claim 1, wherein a telescopic caliper which is horizontal to the central line of a spindle is arranged on the side surface of a spindle box body parallel to the spindle, and the maximum measuring range is set to be 500-800 mm.
6. The compact parallel driving type double-clamping-disc lathe spindle system of claim 1, wherein the front end surface and the rear end surface of the spindle box body are respectively provided with an oil drain hole, the front end oil drain hole is 2-5 mm away from the bottom, the rear end oil drain hole is 70-90 mm away from the bottom, and the spindle box body is blocked by a leakage-proof bolt when not in use.
7. The compact parallel driving type double-chuck lathe spindle system is characterized in that a three-jaw chuck or a barrel type clamp is adopted by the clamping chuck A (3) and the clamping chuck B (12), a dustproof check ring (28) is arranged on the outer end face side of the right hydraulic cylinder pull rod (16), and lubricating oil is stored in a space except for installing parts inside the spindle box body (2).
8. The compact parallel driving type double-chuck lathe spindle system of claim 1, wherein the clamping and loosening specific method is that wedge-shaped padding is arranged at the tail end of a hydraulic cylinder pull rod, and the wedge-shaped padding converts axial movement of the pull rod into radial movement of chuck jaws, so that clamping and loosening actions of the chuck are realized.

Description

Compact parallel driving type double-clamping-disc lathe spindle system Technical Field The invention relates to the field of machining, in particular to a compact parallel driving type double-clamping-disc lathe spindle system. Background The chuck is a device for positioning and clamping a workpiece on a lathe, ensures that the workpiece is in a correct position when being turned, has direct and important influence on machining efficiency, cost, quality and safety, and therefore, the structural design of the chuck should be compatible with practicality, economy and reliability. The traditional lathe spindle system clamps one end of a shaft part by using a chuck, and performs turning or drilling on the other end. In order to improve the machining efficiency and the machining progress, a double-end lathe also appears in recent years, and the double-end lathe is characterized in that a chuck is used for clamping the middle part of a shaft part, and turning or drilling machining is simultaneously carried out on two sides of a workpiece. For long-axis parts, a large positioning error and a machining error can be generated in the middle of the clamping shaft part of a single chuck, so that the middle of the clamping shaft part of the single chuck is matched with two chucks, and the clamping span of the part is increased. In the prior art, the clamping and loosening actions of the two chucks are controlled simultaneously by an electric signal sent by the numerical control system, but the consistency of the actions of the two chucks is difficult to be reliably ensured due to slight differences of the mechanical structures and control loops of the two chucks. When the clamping/loosening actions of the two chucks are obviously inconsistent, the workpiece is laterally deviated to generate larger positioning errors, and even if the positioning errors are limited, the slight lateral deviation of the processed workpiece can cause the workpiece to be in high pair contact with the chucks, so that mechanical damage is formed on the surface of the workpiece to further influence the machining quality of the workpiece. On the other hand, although one control signal is shared, the actions of the two chucks are realized by two sets of motion actuating mechanisms, so that the internal structure of the main shaft system is complex and the manufacturing cost is relatively high. The invention provides a compact parallel driving type double-clamping-disc lathe spindle system, which utilizes the same hydraulic/pneumatic device to drive clamping and loosening actions of a double-clamping-disc lathe spindle in parallel, can rapidly and stably position and clamp a workpiece, improves turning stability, and effectively reduces damage generated on the surface of the workpiece by the clamping action. Disclosure of Invention The invention provides a compact parallel driving type double-clamping-disc lathe spindle system, which utilizes the same hydraulic/pneumatic device to drive clamping and loosening actions of a double-clamping-disc lathe spindle in parallel, can rapidly position and clamp a workpiece, improves turning stability, and effectively reduces damage generated on the surface of the workpiece by the clamping action. The invention relates to a compact parallel driving type double-clamping disc lathe spindle system, which comprises a spindle servo motor, a spindle box body, clamping chucks A and B, a spindle and an auxiliary spindle, wherein the spindle servo motor is arranged on the spindle box body; The main shaft is connected with the auxiliary main shaft, the main shaft and the auxiliary main shaft penetrate through the main shaft box body, a clamping chuck A, a main shaft receiving disc A, a main shaft right flange, a tapered roller bearing A, a straight bevel gear, a locking nut, an oil distributing sleeve, a tapered roller bearing B, a main shaft left flange, a main shaft receiving disc B and a clamping chuck B are sequentially arranged from one side of the main shaft to one side of the auxiliary main shaft, and the main shaft, the auxiliary main shaft and the gear are respectively fixed. The main shaft and the auxiliary main shaft are hollow shaft structures, the inner cross sections of the main shaft and the auxiliary main shaft are different, the main shaft, the right hydraulic cylinder pull rod, the left hydraulic cylinder pull rod and the left screw sleeve respectively form a sealing cavity Q1, a sealing cavity Q2 and a sealing cavity Q3, an oil inlet and outlet hole T1, an oil inlet and outlet hole T2 and an oil inlet and outlet hole T3 which are arranged corresponding to the sealing cavity Q1, the sealing cavity Q2 and the sealing cavity Q3 are arranged on the main shaft, hydraulic oil enters the sealing cavity from the oil inlet and outlet holes so as to drive the left hydraulic cylinder pull rod and the right hydraulic cylinder pull rod to act in parallel, and the left hydraulic cylinder pull rod and the right hyd