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CN-121972831-A - High-precision laser cutting machine

CN121972831ACN 121972831 ACN121972831 ACN 121972831ACN-121972831-A

Abstract

The application belongs to the technical field of laser cutting devices, and relates to a high-precision laser cutting machine which comprises a machine base, a laser cutting head fixedly connected with a screw body I arranged on a screw rod I of a first ball screw unit, a second ball screw unit and a pair of supporting components. The second screw rod of the second ball screw unit is oppositely arranged above the first screw rod. The two supporting components are oppositely arranged at the left side and the right side of a nut body II arranged on the screw rod II. The support assembly comprises a sliding seat and a self-wetting sleeve part. The sliding seat is matched with the machine base through a rail structure which is arranged in a left-right extending way. The two sliding seats are respectively fixed with the second nut body through the connecting rod. The self-lubricating sleeve part comprises a shell and a self-lubricating sleeve body arranged in the shell, the self-lubricating sleeve body is sleeved on the first screw rod, and the shell is fixedly connected with the sliding seat. The application can carry out follow-up support on the positions near the two sides of the nut body on the screw rod bearing the laser cutting head, and is beneficial to improving the rigidity of the screw rod in the running state.

Inventors

  • MA CHAOKUN
  • ZHOU GUOZHEN
  • YAO KAI
  • LIU BINBIN

Assignees

  • 山东新锐激光科技有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The high-precision laser cutting machine comprises a first ball screw unit (200) fixedly arranged on a machine base (100) and a laser cutting head (300) fixedly connected with a first nut body (203) arranged on a first screw (201) of the first ball screw unit (200), and is characterized by also comprising a second ball screw unit (400) fixedly arranged on the machine base (100) and a pair of supporting components (500); A second screw rod (401) of the second ball screw unit (400) is oppositely arranged above the first screw rod (201); the two supporting components (500) are oppositely arranged at the left side and the right side of a nut body II (403) arranged on the screw rod II (401); the support components (500) comprise a sliding seat (501) and a self-lubricating sleeve part (502); the two sliding seats (501) are matched with the machine base (100) through a rail structure which is arranged in a left-right extending way, and the two sliding seats (501) are respectively fixed with the second nut body (403) through a connecting rod (404); The self-lubricating sleeve part (502) comprises a shell and a self-lubricating sleeve body arranged in the shell, the self-lubricating sleeve body is sleeved on the first screw rod (201), and the shell is fixedly connected with the sliding seat (501).
  2. 2. The high-precision laser cutting machine according to claim 1, wherein the first connecting arm (5011) is arranged on the sliding seat (501), the second connecting arm (5021) is arranged on the self-lubricating sleeve part (502), and the first connecting arm (5011) and the second connecting arm (5021) are connected through a butt joint structure capable of applying elastic acting force on the self-lubricating sleeve part (502) in the vertical direction.
  3. 3. The high-precision laser cutting machine according to claim 2, wherein the butt joint structure comprises a connecting cylinder (10) arranged at the lower part of the first connecting arm (5011), a pre-tightening spring (20) sleeved at the lower part of the connecting cylinder (10), and a frame body (30) arranged at the upper part of the second connecting arm (5021); The upper end of the connecting cylinder part (10) is provided with a threaded counter bore (11) matched with a threaded rod section (5012) on the first connecting arm (5011), and the lower end of the connecting cylinder part is provided with a disc-shaped body (12); a first through hole (311) for the connecting cylinder (10) to pass through is arranged on the top plate (31) of the mold frame body (30), and the inner diameter of the first through hole (311) is larger than the outer diameter of the connecting cylinder (10); the disc-shaped body (12) is placed in the cavity of the frame body (30), and the two ends of the pre-tightening spring (20) are respectively in contact matching with the lower end face of the top plate (31) and the upper end face of the disc-shaped body (12).
  4. 4. The high-precision laser cutting machine according to claim 3, wherein a conical boss (312) coaxial with the first through hole (311) is formed on the lower end face of the top plate (31), the small diameter end of the conical boss (312) faces downwards, and the upper end of the pre-tightening spring (20) is in contact matching with the annular conical surface of the conical boss (312).
  5. 5. The high-precision laser cutting machine as set forth in claim 3, wherein the elastic sleeve (40) is sleeved at the middle part of the connecting sleeve (10), and the elastic sleeve (40) can be kept in a state of being placed in the first through hole (311).
  6. 6. The high-precision laser cutting machine according to claim 3, further comprising a vibration absorbing pad (50) fixedly arranged on the upper end surface of the top plate (31), and a double ring body (60) arranged on the upper part of the vibration absorbing pad (50); The vibration absorbing pad (50) is made of elastic materials and is provided with a multi-step shaft hole (51) with the minimum inner diameter not smaller than the inner diameter of the through hole I (311); the double-ring body (60) comprises an inner ring body (61), an outer ring body (62) and a plurality of elastic deformation bodies (63) which are radially connected between the two ring bodies and distributed at intervals around the circumference, wherein the outer ring body (62) is fixedly arranged at the upper port of the multi-stage shaft hole (51) through a plurality of studs (622) distributed at intervals around the circumference, the inner ring body (61) and the first through hole (311) are coaxially arranged, and the inner diameter of the inner ring body (61) is consistent with the outer diameter of the connecting cylinder (10).
  7. 7. The high-precision laser cutting machine according to claim 6, wherein an inner wedge surface (54) is formed on the shock absorbing pad (50) at the upper port of the multi-stage shaft hole (51), and an outer wedge surface (64) is formed at the lower end edge of the outer ring body (62); a plurality of through holes III (621) which are correspondingly matched with the studs (622) are formed in the outer ring body (62), and the inner diameter of each through hole III (621) is larger than the outer diameter of each stud (622); The stud bolts (622) are sleeved with spring pieces (623), and two ends of each spring piece (623) are respectively contacted with the outer ring body (62) and screw caps of the stud bolts (622), so that the spring pieces (623) can push the outer ring body (62) to enable the outer wedge surface (64) to be in contact and matched with the inner wedge surface (54).
  8. 8. The high-precision laser cutting machine according to claim 6, further comprising a cap (70) fixedly provided on the shock absorbing pad (50) and capable of sealing the double ring body (60) inside thereof, wherein a shaft hole corresponding to the connecting cylinder (10) is provided on the cap (70), and a seal ring (711) is provided between the shaft hole and the opposite peripheral surface of the connecting cylinder (10).
  9. 9. The high-precision laser cutting machine as set forth in claim 8, wherein the cap (70) is made of an elastic material having shock absorbing and damping capabilities.
  10. 10. The high-precision laser cutting machine according to claim 8, wherein the shock absorbing pad (50) and the lower end of the cap (70) are respectively formed with a first annular flange (52) and a second annular flange (72) extending radially outwards, the first annular flange (52) and the second annular flange (72) are arranged vertically opposite to each other and fixedly connected together, a concave notch portion (53) is formed at the root portion of the first annular flange (52), and the notch portion (53) enables the first annular flange (52) to elastically deform at the root portion thereof.

Description

High-precision laser cutting machine Technical Field The invention belongs to the technical field of laser cutting devices, and particularly relates to a high-precision laser cutting machine. Background The high-precision laser cutting machine is a high-end manufacturing device integrating laser optics, precision machinery, numerical control and automation technology, and is mainly used for realizing non-contact material cutting with micron-level precision through extremely-thin high-energy laser beams, and is mainly used for precisely processing thin metal and nonmetal with extremely high precision and edge quality requirements, and the performance of a transmission system (used for carrying a laser cutting head to walk) on the high-precision laser cutting machine directly influences indexes such as processing precision, section surface quality, production efficiency and the like. In the prior art, a linear transmission mode adopted on the laser cutting machine with long-stroke and high-running-speed application scene requirements mainly comprises two types of rack transmission and ball screw transmission. The rack transmission has the advantages of unlimited travel and extremely high movement speed, and is a common scheme of large-scale high-speed numerical control equipment. However, there is also a drawback inherent in the rack gear in that a minute backlash is necessarily present due to the meshing of the pinion and the rack, and such backlash cannot be completely eliminated even if a backlash eliminating structure is provided. Further, during the reciprocating high-speed motion, particularly during the frequent reversing and acceleration/deceleration operation, vibration and impact may occur (due to the existence of the micro-gaps), noise is generated, and stability is affected. In addition, the transmission accuracy is also limited by the manufacturing and mounting accuracy of the racks themselves, which is often difficult to achieve stable, reliable micron-sized positioning, and which decays rapidly after long-term wear. Further, for precision cutting applications requiring precise profile control and high surface quality, the dynamic accuracy of rack drive is not sufficient as a major bottleneck. Ball screw drive, which is a highly efficient and precise drive that has been widely used, has significant advantages in achieving dynamic high-precision machining, although it is inferior in high-speed running performance to long-travel running. Currently, there are further demands for performances such as large stroke, high running speed, high machining precision, etc., and linear transmission mechanisms configured on laser cutters are mostly in the form of ball screw transmission. However, with the increase of the axial length of the screw in the ball screw mechanism, the problems of insufficient axial rigidity and vibration resistance of the screw are more remarkable, and the dynamic deformation of the screw lever is possibly more remarkable, so that the cutting head is excessively vibrated, and the practical requirements of high running speed and high machining precision can not be met. Therefore, the laser cutting machine having performance requirements for long stroke, high operation speed and high processing precision is necessarily limited in further increase of the stroke and further increase of the operation speed. It is needed to design a high-precision laser cutting machine which can improve the rigidity of a screw rod, further can better meet the requirements of long stroke, high (running) speed and high (machining) precision, can realize micron-sized precise machining control under the conditions of long stroke and high-speed movement, and can keep good machining stability. Disclosure of Invention The invention provides a high-precision laser cutting machine which can carry out follow-up support on positions near two sides of a nut body on a screw rod bearing a laser cutting head, and is beneficial to improving the rigidity of the screw rod in an operation state. The technical scheme includes that the high-precision laser cutting machine comprises a first ball screw unit fixedly arranged on a machine base, a laser cutting head fixedly connected with a screw body arranged on a screw body of the first ball screw unit, a second ball screw unit fixedly arranged on the machine base and a pair of supporting components. The second screw rod of the second ball screw unit is oppositely arranged above the first screw rod. The two supporting components are oppositely arranged at the left side and the right side of a nut body II arranged on the screw rod II. The support assembly comprises a sliding seat and a self-wetting sleeve part. The sliding seat is matched with the machine base through a rail structure which is arranged in a left-right extending way. The two sliding seats are respectively fixed with the second nut body through the connecting rod. The self-lubricating sleeve part comprises a shell