CN-117001201-B - Copper melting welding process for inner hole of cylinder barrel of hydraulic cylinder

CN117001201BCN 117001201 BCN117001201 BCN 117001201BCN-117001201-B

Abstract

The invention discloses a welding process for welding inner holes of cylinder barrels of hydraulic cylinders, and relates to the technical field of welding. The cylinder bottom welding step is to weld the inner wall of the cylinder bottom of the inner hole of the hydraulic cylinder along the direction from the cylinder bottom of the cylinder barrel of the hydraulic cylinder to the cylinder opening end until the inner wall is welded to a preset distance from the annular groove, and a first welding bead is formed. The ring groove welding step is specifically to weld the ring groove, and a second welding bead is formed. The ring groove lap joint step is specifically to continue to weld the inner wall of the cylinder bottom of the inner hole in the cylinder bottom welding step, a third welding bead is formed, one end of the third welding bead is lapped with the first welding bead, the other end of the third welding bead is lapped with the second welding bead, and transition of the junction position of the inner wall of the cylinder bottom and the annular groove is realized. Compared with the prior art, the welding process disclosed by the invention has the advantages that the number of air holes of a welded finished product is greatly reduced, the repair rate is greatly reduced, and the welding quality is obviously improved.

Inventors

LIU MENGMENG
LI SHUANGBIN
WU ANFENG
ZHENG LONGLONG
LIU GUANGMING
REN CHENGPENG
SONG XIAOFENG
LIU RENQI
YANG ZHIMING
NI QIAN
ZHANG GUOQI
LIU SHINING

Assignees

郑州煤机综机设备有限公司

Dates

Publication Date: 20260508
Application Date: 20230825

Claims (7)

1. The utility model provides a hydraulic cylinder hole melts copper welding process for build-up welding one deck copper alloy material on the lateral wall surface of the hole of hydraulic cylinder, the lateral wall of hole has set gradually annular groove, screw thread extension and quiet sealing mating surface from the cylinder bottom to jar mouth end's direction, just screw thread extension with be formed with the step face between the quiet sealing mating surface, its characterized in that includes the step: Welding the cylinder bottom, namely welding the side wall of the inner hole along the direction from the cylinder bottom end to the cylinder opening end of the cylinder barrel of the hydraulic cylinder until the side wall is welded to a preset distance away from the annular groove, and forming a first welding bead; Ring groove welding, namely welding the annular groove, and forming a second welding bead; The annular groove is lapped, the side wall of the inner hole is welded, a third welding bead is formed, one end of the third welding bead is lapped with the first welding bead, and the other end of the third welding bead is lapped with the second welding bead; The cylinder bottom welding step specifically comprises the following steps: Preheating welding, wherein a preset length is welded at a first welding speed in a CMT welding mode along the direction from the cylinder bottom end to the cylinder opening end of the cylinder barrel of the hydraulic cylinder, and a sixth welding bead is formed; The method comprises the steps of performing speed-up welding, namely adopting a CMT welding mode to weld at a second welding speed along the direction from the cylinder bottom end of the cylinder barrel to the cylinder opening end of the hydraulic cylinder to a preset distance away from the annular groove, and forming a seventh welding bead, wherein the seventh welding bead is connected with the sixth welding bead, the sixth welding bead and the seventh welding bead form the first welding bead, and the second welding speed is higher than the first welding speed; The preset length is 50mm-100mm, and the first welding speed is 280mm/min-300mm/min; the second welding speed is 430mm/min-450mm/min; the preset distance is 70mm-80mm.
2. The hydraulic cylinder bore braze welding process of claim 1, further comprising the steps of: step welding, namely welding the step surface, and forming a fourth welding bead; And the cylinder opening is welded, the static seal matching surface is welded along the direction from the cylinder bottom end of the cylinder barrel of the hydraulic cylinder to the cylinder opening end, and a fifth welding bead is formed and is connected with the fourth welding bead.
3. The hydraulic cylinder bore inner hole copper melting welding process according to claim 2, wherein the step welding step is located between the ring groove welding step and the ring groove lapping step, and both the ring groove welding step and the step welding step are performed in a pulse mode.
4. The welding process for welding inner holes of cylinder barrels of hydraulic cylinders according to claim 2, wherein the specific welding speed of the ring groove welding step and the step welding step is 320mm/min-340mm/min, and the welding current is 200A.
5. The hydraulic cylinder bore hole braze welding process of claim 2, wherein a cylinder port end of the bore hole is chamfered and the fifth weld bead extends to a surface of the chamfer.
6. The hydraulic cylinder bore inner hole braze welding process of claim 2, further comprising a detecting step after the cylinder port welding step, wherein the detecting step specifically detects whether there is an air hole on the welding surfaces of the first weld bead, the second weld bead, the third weld bead, the fourth weld bead and the fifth weld bead, and re-welds if there is an air hole.
7. The hydraulic cylinder bore brazing process according to claim 1, further comprising an inner wall cleaning step prior to the cylinder bottom welding step, wherein the inner wall cleaning step is specifically to wipe the side wall of the bore with foam cotton dip alcohol.

Description

Copper melting welding process for inner hole of cylinder barrel of hydraulic cylinder Technical Field The invention relates to the technical field of welding, in particular to a copper melting welding process for an inner hole of a cylinder barrel of a hydraulic cylinder. Background The mining hydraulic support is widely used in coal mining, in the working process of a hydraulic cylinder barrel in the hydraulic support, hard particles are easily accumulated on the matching surface of the inner wall and the upright post to cause scratch, and corrosive media such as water, H 2 S and the like are easily mixed in hydraulic oil, so that the inner wall of the hydraulic cylinder barrel is corroded, the sealing effect is affected, and the lifting force is reduced. Therefore, the copper alloy welding wire is melted by adopting a welding method, and a layer of copper alloy material is piled on the inner wall surface of the cylinder barrel, so that the corrosion resistance of the part is improved, and the service life of the part is prolonged. In the prior art, welding is generally performed from the cylinder opening end of the hydraulic cylinder to the cylinder bottom or from the cylinder bottom of the hydraulic cylinder to the cylinder opening end, and a set of welding parameters are used at different welding positions. Because in the different welding positions of cylinder structure, the welded areas of inner hole regular circumference, deep groove, step surface and other forms can appear, and the welding is a complicated process, its influence factor has many, and welder angle, from work piece height, whether the contact tip is smooth and easy, welding wire is dry long, the condition such as shielding gas flow, wire feed speed, current voltage, pendulum distance, speed can influence each other, therefore in different welded areas, to different weld forms, use same set of welding parameter can lead to producing more welding defect at juncture such as hole, recess, make the repair rate higher. Therefore, how to improve the welding quality of the welding process of the inner hole molten copper of the cylinder barrel of the hydraulic cylinder and reduce the repair rate becomes a technical problem to be solved urgently by those skilled in the art. Disclosure of Invention Therefore, the invention aims to provide a welding process for the inner hole of the cylinder barrel of the hydraulic cylinder, so as to improve the welding quality of the welding process for the inner hole of the cylinder barrel of the hydraulic cylinder and reduce the repair rate. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides a hydraulic cylinder hole melts copper welding process for in the lateral wall surface build-up welding one deck copper alloy material of the hole of hydraulic cylinder, the lateral wall of hole has set gradually annular groove, screw thread extension and quiet sealing mating surface in the direction of jar mouth end from the cylinder bottom, just screw thread extension with be formed with the step face between the quiet sealing mating surface, include the step: Welding the cylinder bottom, namely welding the side wall of the inner hole along the direction from the cylinder bottom end to the cylinder opening end of the cylinder barrel of the hydraulic cylinder until the side wall is welded to a preset distance away from the annular groove, and forming a first welding bead; Ring groove welding, namely welding the annular groove, and forming a second welding bead; and the annular groove is lapped, the side wall of the inner hole is welded, a third welding bead is formed, one end of the third welding bead is lapped with the first welding bead, and the other end of the third welding bead is lapped with the second welding bead. Optionally, in the above hydraulic cylinder inner bore copper melting welding process, the cylinder bottom welding step specifically includes the steps of: Preheating welding, wherein a preset length is welded at a first welding speed in a CMT welding mode along the direction from the cylinder bottom end to the cylinder opening end of the cylinder barrel of the hydraulic cylinder, and a sixth welding bead is formed; and (3) performing speed-increasing welding, wherein a CMT welding mode is adopted along the direction from the cylinder bottom end to the cylinder opening end of the cylinder barrel of the hydraulic cylinder, the welding is performed at a second welding speed to be spaced from the annular groove by the preset distance, a seventh welding bead is formed, the seventh welding bead is connected with the sixth welding bead, the sixth welding bead and the seventh welding bead form the first welding bead, and the second welding speed is higher than the first welding speed. Optionally, in the welding process of the inner hole copper melting of the cylinder barrel of the hydraulic cylinder, the preset length is 50mm-100mm