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CN-121245626-B - Polishing device for welding seam of thin-wall stainless steel pipe

CN121245626BCN 121245626 BCN121245626 BCN 121245626BCN-121245626-B

Abstract

The invention discloses a polishing device for a welding seam of a thin-wall stainless steel pipe, which belongs to the technical field of metal processing machine tools and comprises a main shaft, wherein the middle part of the main shaft is provided with a through hole for accommodating the thin-wall steel pipe to be polished, the circumferential side wall of the through hole is provided with a clamping groove, an electromagnetic strip is movably embedded in the clamping groove, and a push rod is coaxially opposite to the through hole and is driven by a push rod sliding table to horizontally approach or separate from the main shaft. According to the invention, through the highly integrated dual-mode power relay, the integration and the rapid nondestructive switching of the polishing and ultrasonic impact functions are realized, and the two working procedures are combined into one, so that the production efficiency is greatly improved, and the positioning error caused by repeated clamping is avoided.

Inventors

  • WANG YUEQIANG

Assignees

  • 四川岷河管道建设工程有限公司

Dates

Publication Date
20260508
Application Date
20251205

Claims (6)

  1. 1. A thin-walled stainless steel pipe weld grinding device, comprising: A through hole (62) for accommodating the thin-wall steel pipe (5) to be polished is formed in the middle of the main shaft (6), a clamping groove (63) is formed in the circumferential side wall of the through hole (62), and an electromagnetic strip (64) is movably embedded in the clamping groove (63); The ejector rod (4) is coaxially opposite to the through hole (62) and is driven by an ejector rod sliding table (41) to horizontally approach or separate from the main shaft (6); grinding assembly (3), comprising: A rotary grinding unit (33) with an end detachably mounted with a grinding head (7) with a grinding disc (72); An ultrasonic vibration unit (35); a relay (34) connected between the rotary grinding unit (33) and the ultrasonic vibration unit (35) and configured to: in a first state, allowing the rotary sanding unit (33) to rotate relative to the ultrasonic vibration unit (35); transmitting the vibration of the ultrasonic vibration unit (35) to the rotary grinding unit (33) in the second state to realize synchronous vibration; the multi-degree-of-freedom sliding table (2) is used for driving the polishing assembly (3) to move in a three-dimensional space; The ejector rod (4) is used for being inserted into a welding seam (51) of the thin-wall steel pipe (5) for end limiting and internal supporting during polishing; The relay (34) comprises a shell (341) and an extension piece (343) fixedly connected with the ultrasonic vibration unit (35), a rotating shaft (331) of the rotary polishing unit (33) is rotatably arranged in the shell (341) through a bearing, and a detachable connecting mechanism driven by hydraulic pressure is arranged between the extension piece (343) and the rotating shaft (331); The detachable connecting mechanism comprises a piston rod (345) arranged on an extension piece (343), a middle sleeve (348) and an end sleeve (347) which are matched with the thread groove (334), a pressure head (349) is arranged at the end part of the piston rod (345), and an everting flange (346) is arranged at the end part of the extension piece (343); In a first state, the ram (349) and the everting flange (346) are separated from the intermediate sleeve (348) enabling the shaft (331) to rotate relative to the extension (343); in the second state, the pressing head (349) and the outward turning flange (346) are abutted against the middle sleeve (348), and the rotating shaft (331) and the extension piece (343) are locked to transmit vibration; the middle sleeve (348) and the end sleeve (347) are in threaded connection with the threaded groove (334), the opposite contact surfaces of the middle sleeve (348) and the pressure head (349) and the opposite contact surfaces of the everting flange (346) and the middle sleeve (348) are provided with frosted surfaces; The polishing assembly (3) further comprises a position adjusting unit, the position adjusting unit comprises a rotation adjusting piece (31) and a swinging adjusting piece (32), the rotation adjusting piece (31) is arranged on the multi-degree-of-freedom sliding table (2), the swinging adjusting piece (32) is connected between the rotation adjusting piece (31) and the relay piece (34), and the rotation adjusting piece (31) is used for realizing angle switching between a first state and a second state so that the grinding disc (72) and the middle rod (71) are respectively contacted with a welding line.
  2. 2. The polishing device for the welding seam of the thin-wall stainless steel pipe according to claim 1, wherein the rotation adjusting piece (31) comprises a rotation driver (311), an adapter seat (315) is fixed at the output end of the rotation driver (311), and the adapter seat (315) is connected with the swing adjusting piece (32) through a rotating sleeve (314).
  3. 3. The polishing device for welding seams on thin-walled stainless steel pipes according to claim 1, wherein the swing adjusting member (32) comprises a first swing plate (321) and a second swing plate (323) connected by a hinge base (322), and a first telescopic cylinder (324) and a second telescopic cylinder (325) for driving the relative angle change of the two swing plates.
  4. 4. The polishing device for welding seams of thin-walled stainless steel pipes according to claim 1, characterized in that the multi-degree-of-freedom sliding table (2) comprises a first linear module (21) and a second linear module (23) which are perpendicular to each other, and a rotating module (22) with a rotating axis parallel to the main shaft (6).
  5. 5. The thin-walled stainless steel pipe weld grinding device of claim 1, wherein the ultrasonic vibration unit (35) comprises a resonance unit (352) and a horn (351), the horn (351) being fixedly connected to an extension (343) of the relay (34).
  6. 6. The polishing device for the welding seam of the thin-wall stainless steel tube according to claim 1, further comprising a machine body (1), wherein the main shaft (6), the ejector rod sliding table (41) and the multi-degree-of-freedom sliding table (2) are all installed on the machine body (1), and a movable door is arranged at a position, corresponding to the thin-wall steel tube (5), of the machine body (1).

Description

Polishing device for welding seam of thin-wall stainless steel pipe Technical Field The invention belongs to the technical field of metal processing machine tools, and particularly relates to a polishing device for a welding seam of a thin-wall stainless steel pipe. Background The thin-wall stainless steel tube is widely applied to high-end fields such as food, medicine, chemical industry, aerospace, automobile exhaust treatment and the like due to excellent corrosion resistance, strength and aesthetic property. In these applications, the joining of pipes is mainly dependent on the welding process, but the welding process inevitably generates protrusions, irregularities and oxide layers in the weld area, affecting the aesthetic appearance and fluid passage of the pipe. At present, aiming at the treatment of the welding seam of the thin-wall stainless steel pipe, the manual treatment mode is mainly dependent on a hand-held angle grinder of a worker to polish, the mode has high labor intensity and low production efficiency, and automation equipment finishes polishing on the equipment, but larger residual tensile stress is generated in the welding seam and a heat affected zone of the welding seam due to local uneven heating and cooling in the welding process, after polishing, the stress is not released, new mechanical stress is generated on the surface due to polishing, and the stress acts on the welding seam of the thin-wall steel pipe to influence the strength of the welding seam and even cause internal defects, so that the research and development of the welding seam polishing device for the thin-wall stainless steel pipe is needed to solve the pain point of the industry. Disclosure of Invention The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the polishing device for the welding seam of the thin-wall stainless steel pipe. The technical scheme adopted for solving the technical problems is as follows: a thin-walled stainless steel pipe weld grinding device comprising: the main shaft is provided with a through hole for accommodating a thin-wall steel pipe to be polished in the middle part, the circumferential side wall of the through hole is provided with a clamping groove, and an electromagnetic strip is movably embedded in the clamping groove; the ejector rod is coaxially opposite to the through hole and driven by an ejector rod sliding table to horizontally approach or separate from the main shaft; A sanding assembly comprising: a rotary polishing unit, the end part of which is detachably provided with a polishing head with a polishing disc; An ultrasonic vibration unit; a relay connected between the rotary sanding unit and the ultrasonic vibration unit and configured to: in a first state, allowing the rotary polishing unit to rotate relative to the ultrasonic vibration unit; transmitting the vibration of the ultrasonic vibration unit to the rotary grinding unit in a second state to realize synchronous vibration; The multi-degree-of-freedom sliding table is used for driving the polishing assembly to move in a three-dimensional space; The thin-wall steel pipe is driven by the main shaft to rotate around the ejector rod, the rotating and polishing unit is driven by the relay piece of the polishing assembly to rotate relatively to the rotating and polishing unit, the rotating and polishing unit drives the grinding disc to rotate coaxially to the thin-wall steel pipe, the swing adjusting piece drives the grinding disc to swing and adjust an included angle with the axis of the thin-wall steel pipe, the multi-degree-of-freedom sliding table controls the distance between the edge of the grinding disc and the thin-wall steel pipe to be consistent so as to polish the surface of a weld at multiple angles, the non-smooth weld is guaranteed to be sufficiently polished, the ejector rod limits the end of the thin-wall steel pipe to avoid the tear of the weld caused by vibration of the grinding disc, the rotating and adjusting piece drives the rotating and polishing unit to rotate ninety degrees anticlockwise, the multi-degree sliding table controls the middle rod to align to the weld and enables an extension line of the middle rod to pass through the circle center of the thin-wall steel pipe, the relay piece enables the ultrasonic vibration unit and the rotating and the polishing unit to vibrate at high frequency, the inner stress is eliminated by impacting the weld through the end of the middle rod, and the ejector rod supports the inner wall of the thin-wall steel pipe from the inner side to prevent concave deformation of the weld. Further, the relay comprises a shell and an extension piece fixedly connected with the ultrasonic vibration unit, a rotating shaft of the rotary polishing unit is rotatably installed in the shell through a bearing, and a detachable connecting mechanism driven by hydraulic pressure is arranged between the extension piece and the rota