阅读说明：本技术 一种金属管材局部快速焊接的装置及方法 (Device and method for local rapid welding of metal pipe ) 是由 李大龙 刘武东 于 2020-03-23 设计创作，主要内容包括：本发明涉及一种金属管材局部快速焊接的装置及方法,属于焊接的技术领域,两块金属管材A和金属管材B的待焊接处套装圆环焊接钎料,所述圆环焊接钎料外套有外齿轮三爪卡盘,所述外齿轮三爪卡盘为齿轮结构,所述外齿轮三爪卡盘通过齿轮传动连接轴齿轮,所述轴齿轮的轴心处安装正电滑刷；所述金属管材B轴心处安装凸轮轴,所述凸轮轴靠近金属管材B的端面安装负电滑刷,所述凸轮轴对应圆环焊接钎料位置处安装内孔三爪卡盘；所述外齿轮三爪卡盘的内圈和内孔三爪卡盘的外圈上安装石墨电极。本发明具有对焊接钎料的均匀加热的效果,从而解决感应钎焊过程中焊接钎料内外表面温差较大的问题。(The invention relates to a device and a method for rapidly welding local parts of metal pipes, belonging to the technical field of welding.A circular ring welding brazing filler metal is sleeved at the parts to be welded of two metal pipes A and B, an external gear three-jaw chuck is sleeved outside the circular ring welding brazing filler metal, the external gear three-jaw chuck is in a gear structure, the external gear three-jaw chuck is connected with a shaft gear through gear transmission, and a positive electric sliding brush is arranged at the axis of the shaft gear; a camshaft is arranged at the axis of the metal pipe B, a negative electric sliding brush is arranged on the end surface of the camshaft close to the metal pipe B, and an inner hole three-jaw chuck is arranged at the position of the camshaft corresponding to the ring welding brazing filler metal; and graphite electrodes are arranged on the inner ring of the external gear three-jaw chuck and the outer ring of the inner hole three-jaw chuck. The invention has the effect of uniformly heating the welding solder, thereby solving the problem of large temperature difference between the inner surface and the outer surface of the welding solder in the induction brazing process.)

1. The utility model provides a local quick welding's of metal tubular product device which characterized in that: the welding method comprises the following steps that circular welding brazing filler metal (6) is sleeved at the to-be-welded positions of two metal pipes A (1) and two metal pipes B (4), an external gear three-jaw chuck (3) is sleeved outside the circular welding brazing filler metal (6), the external gear three-jaw chuck (3) is of a gear structure, the external gear three-jaw chuck (3) is connected with a shaft gear (8) through gear transmission, and positive electric sliding brushes (7) are installed at the axle centers of two sides of the shaft gear (8); a camshaft (16) is installed at the axis of the metal pipe B (4), a negative electricity sliding brush (5) is installed on the end face, close to the metal pipe B (4), of the camshaft (16), and an inner hole three-jaw chuck (12) is installed at the position, corresponding to the annular welding brazing filler metal (6), of the camshaft (16); and graphite electrodes (10) are arranged on the inner ring of the external gear three-jaw chuck (3) and the outer ring of the inner hole three-jaw chuck (12).

2. The device for the local rapid welding of the metal pipes according to claim 1 is characterized in that: the camshaft (16) is provided with a bearing (15) at the position corresponding to the inner hole three-jaw chuck (6), and the bearing (15) is connected with the inner hole three-jaw chuck (6) through a gear (14).

3. The device for the local rapid welding of the metal pipes according to claim 1 is characterized in that: three graphite electrode claws (9) are installed on hole three-jaw chuck (12) and outer gear three-jaw chuck (3) respectively, graphite electrode (10) are installed in the draw-in groove on graphite electrode claw (9), graphite electrode (10) material is artificial graphite.

4. The device for the local rapid welding of the metal pipes according to claim 1 is characterized in that: insulation is arranged between the positive electric sliding brush (7) and the gear surface of the shaft gear (8); the brush needle of the positive electric sliding brush (7) is inserted into the shaft of the shaft gear (8), the brush needle of the negative electric sliding brush (5) is inserted into the cam shaft (16), and the positive electric sliding brush (7) and the negative electric sliding brush (5) are fixedly installed on the frame.

5. The device for the local rapid welding of the metal pipes according to claim 3 is characterized in that: outer gear three-jaw chuck (3) one side fixed mounting has gear end cover A (11), hole three-jaw chuck (12) one side fixed mounting gear end cover B (17), install on gear end cover A (2) and gear end cover B (13) graphite electrode claw (9), be provided with the gear A (2) of screwing that is used for fixed outer gear three-jaw chuck (3) and hole three-jaw chuck (12) and screw gear B (13) on gear end cover A (11) and gear end cover B (17) respectively.

6. A method for locally and rapidly welding a metal pipe is characterized by comprising the following steps:

the method comprises the following steps: establishing a finite element model by using finite element simulation software for simulation, determining the distance between a graphite electrode (10) on an external gear three-jaw chuck (3) and the welding end face of a metal pipe A (1) and the distance between the graphite electrode (10) on an inner hole three-jaw chuck (12) and the welding end face of a metal pipe B (4), and simultaneously determining pulse current parameters and the feeding amount and the feeding speed in the extrusion process of the metal pipe A (1) and the metal pipe B (4);

step two: adjusting the position of a metal pipe A (1) on an external gear three-jaw chuck (3) according to a simulation result, screwing a screwing gear A (2) and fixing the position of the external gear three-jaw chuck (3), adjusting the position of an inner hole three-jaw chuck (12) in a metal pipe B (4) according to the simulation result, screwing a screwing gear B (13) and fixing the position of the inner hole three-jaw chuck (12);

step three: starting a motor, so that a shaft gear (8) and a cam shaft (16) rotate, the gear shaft drives an external gear three-jaw chuck (3) to rotate, so that a graphite electrode (10) is driven to rotate on the outer surface of a metal pipe A (1), and the cam shaft (16) drives an inner hole three-jaw chuck (12) to rotate, so that the graphite electrode (10) is driven to rotate on the inner surface of a metal pipe B (4);

step four: connecting two positive electric sliding brushes (7) with the positive electrode of a pulse power supply, connecting a negative electric sliding brush (5) with the negative electrode of the pulse power supply, starting the pulse power supply, leading in current from the positive electric sliding brushes (7), and returning the current to the negative electrode of the pulse power supply through a shaft gear (8), an external gear three-jaw chuck (3), a graphite electrode (10) on the external gear three-jaw chuck (3), a metal pipe material A (1), a circular welding brazing filler metal (6), a metal pipe material B (4), a graphite electrode (10) on an inner hole three-jaw chuck (12), a cam shaft (16) and the negative electric sliding brush (5);

step five: when the ring welding brazing filler metal (6) reaches a molten state, extruding the metal pipe A (1) according to a feeding direction A and the metal pipe B (4) according to a feeding direction B, and keeping the pressure for 5-10 s;

step six: and (5) turning off the pulse power supply, and naturally cooling to room temperature to finish one-time welding.

Technical Field

The invention relates to a device and a method for local rapid welding of a metal pipe, and belongs to the technical field of welding.

Background

In the existing machining process, two metal pipes are often required to be welded together, so that the welding processing of the metal pipes is an important processing step in the processing process of the metal pipes. Induction brazing is a relatively clean and environment-friendly heating welding mode, but because the induction brazing process of the pipe has the circular ring effect, a large amount of heat is concentrated on the outer surface of the brazing filler metal, and the welding quality of the pipe is poor. In order to solve the defect that the temperature difference between the inner surface and the outer surface is large in the induction brazing process, the invention provides a device capable of uniformly heating a pipe and welding brazing filler metal.

Disclosure of Invention

The invention aims to provide a device and a method for locally and rapidly welding a metal pipe, which have the effect of uniformly heating welding solder, so that the problem of large temperature difference between the inner surface and the outer surface of the welding solder in the induction brazing process is solved.

In order to achieve the purpose, the invention adopts the technical scheme that:

a device and a method for rapidly welding local parts of metal pipes are characterized in that a circular welding brazing filler metal is sleeved at the parts to be welded of two metal pipes A and two metal pipes B, an external gear three-jaw chuck is sleeved outside the circular welding brazing filler metal and is of a gear structure, the external gear three-jaw chuck is connected with a shaft gear through gear transmission, and a positive electric sliding brush is arranged at the axis of the shaft gear; a camshaft is arranged at the axis of the metal pipe B, a negative electric sliding brush is arranged on the end surface of the camshaft close to the metal pipe B, and an inner hole three-jaw chuck is arranged at the position of the camshaft corresponding to the ring welding brazing filler metal; and graphite electrodes are arranged on the inner ring of the external gear three-jaw chuck and the outer ring of the inner hole three-jaw chuck.

The technical scheme of the invention is further improved as follows: the camshaft is provided with a bearing at the position corresponding to the inner hole three-jaw chuck, and the bearing is connected with the inner hole three-jaw chuck through a transmission gear.

The technical scheme of the invention is further improved as follows: the inner hole three-jaw chuck and the outer gear three-jaw chuck are respectively provided with three graphite electrode jaws, the graphite electrodes are arranged in clamping grooves on the graphite electrode jaws, and the graphite electrode material is artificial graphite.

The technical scheme of the invention is further improved as follows: insulation is arranged between the positive electricity sliding brush and the gear surface of the shaft gear; the brush needle of the positive electricity sliding brush is inserted into a shaft of the shaft gear, the brush needle of the negative electricity sliding brush is inserted into a cam shaft, and the positive electricity sliding brush and the negative electricity sliding brush are fixedly installed on the rack.

The technical scheme of the invention is further improved as follows: the utility model discloses a graphite electrode clamp, including outer gear three-jaw chuck, hole three-jaw chuck one side fixed mounting has gear end cover A, hole three-jaw chuck one side fixed mounting gear end cover B, graphite electrode claw installs on gear end cover A and gear end cover B, be provided with the gear A of screwing and the gear B of screwing that is used for fixed outer gear three-jaw chuck and hole three-jaw chuck on gear end cover A and the gear end cover B respectively.

The technical scheme of the invention is further improved as follows: the method comprises the following steps:

the method comprises the following steps: establishing a finite element model by using finite element simulation software for simulation, determining the distance between a graphite electrode on an external gear three-jaw chuck and the welding end face of the metal pipe A and the distance between the graphite electrode on an inner hole three-jaw chuck and the welding end face of the metal pipe B, and simultaneously determining pulse current parameters and the feeding amount and the feeding speed in the extrusion process of the metal pipe A and the metal pipe B;

step two: adjusting the position of the metal pipe A on the outer gear three-jaw chuck according to the simulation result, screwing the gear A tightly, fixing the position of the outer gear three-jaw chuck, adjusting the position of the inner hole three-jaw chuck in the metal pipe B according to the simulation result, screwing the gear B tightly, and fixing the position of the inner hole three-jaw chuck;

step three: starting a motor to enable a shaft gear and a cam shaft to rotate, wherein the gear shaft drives an outer gear three-jaw chuck to rotate so as to drive a graphite electrode to rotate on the outer surface of the metal pipe A, and the cam shaft drives an inner hole three-jaw chuck to rotate so as to drive the graphite electrode to rotate on the inner surface of the metal pipe B;

step four: connecting two positive electric sliding brushes with the positive electrode of a pulse power supply, connecting a negative electric sliding brush with the negative electrode of the pulse power supply, starting the pulse power supply, leading in current from the positive electric sliding brushes, and returning the current to the negative electrode of the pulse power supply through a shaft gear, an external gear three-jaw chuck, a graphite electrode on the external gear three-jaw chuck, a metal pipe A, a circular welding brazing filler metal, a metal pipe B, a graphite electrode on an inner hole three-jaw chuck, a cam shaft and the negative electric sliding brushes;

step five: when the ring welding brazing filler metal reaches a molten state, extruding the metal pipe A according to a feeding direction A and the metal pipe B according to a feeding direction B, and keeping the pressure for 5-10 s;

step six: and (5) turning off the pulse power supply, and naturally cooling to room temperature to finish one-time welding.

Due to the adoption of the technical scheme, the invention has the following technical effects:

1. the device evenly places three graphite electrodes with adjustable sizes on the inner surface and the outer surface of the metal pipe, and can weld the metal pipes with different sizes.

2. The device leads current into the inner surface of the pipe B from the outer surface of the pipe A, so that the welding brazing filler metal between the pipes is uniformly heated, the temperature of the inner side and the outer side of the welding brazing filler metal is uniform, the problem that the inner side and the outer side of the welding brazing filler metal can not be heated simultaneously by induction brazing is solved, and the welding quality of the metal pipes is improved.

3. The invention utilizes the resistance of the metal pipe and the welding solder to heat, is a local rapid heating method, and can improve the processing efficiency.

Drawings

FIG. 1 is an isometric view of the apparatus of the present invention;

FIG. 2 is a schematic representation of the external gear three jaw chuck and shaft gear engagement of the apparatus of the present invention;

FIG. 3 is a schematic view of the engagement of the gear end cap A and the tightening gear A of the device of the present invention;

FIG. 4 is a schematic view of the assembly of gear end cap A and graphite electrode jaw of the apparatus of the present invention;

FIG. 5 is a schematic view of the assembly of the female three-jaw chuck and metal tube B of the apparatus of the present invention;

FIG. 6 is a schematic view of the assembly of the female three-jaw chuck and camshaft of the apparatus of the present invention;

FIG. 7 is a schematic view of the engagement of the gear end cap B and the tightening gear B of the device of the present invention;

FIG. 8 is a schematic view of the assembly of gear end cap B and graphite electrode jaw of the apparatus of the present invention;

FIG. 9 is a detail view of a graphite electrode jaw of the apparatus of the present invention;

FIG. 10 is a drawing of a graphite electrode component of the apparatus of the present invention.

Wherein, 1-metal tube A; 2-screwing the gear A; 3-an external gear three-jaw chuck; 4-metal tube B; 5-negative electric sliding brush; 6-welding brazing filler metal in a circular ring; 7-positive electric sliding brush; 8-shaft gear; 9-graphite electrode claws; 10-a graphite electrode; 11-gear end cap a; 12-inner bore three-jaw chuck; 13-screwing gear B; 14-a transmission gear; 15-a bearing; 16-a camshaft; 17-Gear end cover B.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific embodiments:

the invention discloses a device for locally and rapidly welding a metal pipe, which is shown in figures 1-10, wherein A in figure 1 is the feeding direction of a metal pipe A1, and B is the feeding direction of a metal pipe B4. The welding method comprises the steps that a circular ring welding brazing filler metal 6 is installed at the position, to be welded, of each of two metal pipes A1 and B4 in a sleeved mode, an outer gear three-jaw chuck 3 and an inner hole three-jaw chuck 12 are installed outside the position, corresponding to the circular ring welding brazing filler metal 6, of each of the two metal pipes, three graphite electrodes 10 are fixedly installed on the inner ring of the outer gear three-jaw chuck 3 and the outer ring of the inner hole three-jaw chuck 12 at equal intervals and in an equal angle mode respectively, the graphite electrodes 10 are of a cylindrical structure, the graphite electrodes 10 are installed in clamping grooves of graphite electrode claws 9, the graphite electrodes 10 on the outer gear three-jaw chuck 3 abut against the surface of the circular ring welding brazing filler metal 6, and the graphite electrodes 10 and the graphite electrode claws 9 are made.

The external gear three-jaw chuck 3 is of a gear structure, an external gear is connected with a shaft gear 8, the shaft gear 8 is connected with an external electrode, and positive electric sliding brushes 7 are fixedly arranged on shaft gears on two sides of the shaft gear 8; in addition, the inner hole three-jaw chuck 12 is arranged on a cam shaft 16 at the axle center of the two metal pipes, a bearing 15 is arranged at the position of the cam shaft 16 corresponding to the inner hole three-jaw chuck 12, and the bearing 15 is in transmission connection with the inner hole three-jaw chuck 12 by installing a transmission gear 14 to drive the inner hole three-jaw chuck 12 to rotate; a negative electricity sliding brush 5 is installed at the end face position of the cam shaft 16 near the metal pipe material B4. Insulation is arranged between the negative electric sliding brush 5 and the camshaft 16 and between the positive electric sliding brush 7 and the shaft gear 8; the positive electric sliding brush 7 and the negative electric sliding brush 5 are fixedly arranged on the frame, and conduct electricity by abutting brush needles on the shaft, and when the shaft rotates, the positive electric sliding brush 7 and the negative electric sliding brush 5 do not rotate.

Gear end cover A11 is fixedly installed on one side of the external gear three-jaw chuck 3, gear end cover B17 is fixedly installed on one side of the inner hole three-jaw chuck 12, graphite electrode jaw 9 is installed on gear end cover A2 and gear end cover B13, graphite electrode jaw 9 is of a T-shaped structure, a clamping groove used for placing graphite electrode 10 is formed in the head of graphite electrode jaw 9, and sawteeth are formed in two sides of the body of graphite electrode jaw 9 and connected with gear end cover A2 and gear end cover B13. The gear end cover A11 and the gear end cover B17 are respectively provided with a tightening gear A2 and a tightening gear B13 for fixing the external gear three-jaw chuck 3 and the internal hole three-jaw chuck 12.

The invention also discloses a method for quickly welding the local part of the metal pipe, which comprises the following steps:

the method comprises the following steps: establishing a finite element model by using finite element simulation software for simulation, determining the distance between the graphite electrode 10 on the external gear three-jaw chuck 3 and the welding end face of the metal pipe A1 and the distance between the graphite electrode 10 on the internal hole three-jaw chuck 12 and the welding end face of the metal pipe B4, and simultaneously determining pulse current parameters and the feeding amount and the feeding speed in the extrusion process of the metal pipe A1 and the metal pipe B4;

step two: adjusting the position of the metal pipe A1 on the outer gear three-jaw chuck 3 according to the simulation result, screwing the screwing gear A2 and fixing the position of the outer gear three-jaw chuck 3, and adjusting the position of the inner hole three-jaw chuck 12 in the metal pipe B4, screwing the screwing gear B13 and fixing the position of the inner hole three-jaw chuck 12 according to the simulation result;

step three: starting a motor, so that a shaft gear 8 and a cam shaft 16 rotate, a gear shaft drives an external gear three-jaw chuck 3 to rotate, so that the graphite electrode 10 is driven to rotate on the outer surface of the metal pipe A1, and the cam shaft 16 drives an inner hole three-jaw chuck 12 to rotate, so that the graphite electrode 10 is driven to rotate on the inner surface of the metal pipe B4;

step four: connecting two positive electric sliding brushes 7 with the positive electrode of a pulse power supply, connecting a negative electric sliding brush 5 with the negative electrode of the pulse power supply, starting the pulse power supply, leading current into the pulse power supply from the positive electric sliding brushes 7, and brushing the current back to the negative electrode of the pulse power supply through a shaft gear 8, an external gear three-jaw chuck 3, a graphite electrode 10 on the external gear three-jaw chuck 3, a metal pipe A1, a circular welding brazing filler metal 6, a metal pipe B4, a graphite electrode 10 on an inner hole three-jaw chuck 12, a cam shaft 16 and the negative electric sliding brush 5;

step five: when the ring welding brazing filler metal 6 reaches a molten state, extruding the metal pipe A1 according to a feeding direction A and the metal pipe B4 according to a feeding direction B, and keeping the pressure for 5-10 s;

step six: and (5) turning off the pulse power supply, and naturally cooling to room temperature to finish one-time welding.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape, principle and the like of the invention are covered by the protection scope of the invention.