Surfacing method for threaded ring inner hole step surface

Abstract

The invention discloses a surfacing method for a threaded ring inner hole step surface, and relates to a surfacing method. The problems that surfacing of a step face of an inner hole of a threaded ring is inconvenient, and welding defects are prone to being generated are solved. Through application of automatic welding equipment, the included angle between the axis of a threaded ring and the horizontal plane, the position of a deep hole welding gun on a welding operation machine and the swing amplitude of a gun head are adjusted during surfacing of an inner hole step face, the distance between the gun head and the step face is 8 mm, and the swing amplitude of the gun head is equal to the width of the position to be welded; and the deep hole welding gun performs surfacing on the step surface, so that the surfacing quality of the threaded ring is ensured, the actual production efficiency is greatly improved, the labor cost is reduced, and the product quality and the production efficiency are improved. The invention belongs to the technical field of thread ring surfacing.

Description

Technical Field

[0001] The invention relates to a surfacing method, in particular to a surfacing method for a step surface of an inner hole of a threaded ring, and belongs to the technical field of threaded ring surfacing. Background Art

[0002] A threaded ring is installed around a certain type of pre-start valve disc. The inner circumference of the threaded ring is coaxially provided with three step holes with different inner diameters, and the inner diameter of the middle hole section is larger than the inner diameter of the hole sections on both sides. The threaded ring is responsible for regulating and controlling the steam flow during the startup of the turbine. Therefore, the step surface of the middle hole section needs to be welded with Stellite alloy to enhance the surface strength and performance and ensure the stable operation of the system.

[0003] Due to the limitation of the workpiece structure, the existing manual argon arc welding gun and plasma spray welding gun cannot reach the welding position of the step surface, and cannot weld this step surface. We have tried to use arc welding for surfacing, but after subsequent processing, it was found that slag inclusions and pores were defects, which could not meet the acceptance standards.

[0004] In summary, how to propose a new cladding method to address the above technical issues has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention further provides a method for surfacing the step surface of the inner hole of a threaded ring.

[0006] The technical solution of the present invention is: a method for surfacing the step surface of the inner hole of a threaded ring, which is specifically carried out in the following steps:

[0007] Step 1: Clamp the threaded ring onto the chuck of the welding positioner;

[0008] Step 2: Install the deep hole welding gun on the welding manipulator, and the gun body of the deep hole welding gun is parallel to the horizontal plane;

[0009] Step 3: Adjust the welding positioner to tilt the axis of the threaded ring, insert the deep hole welding gun into the inner hole of the threaded ring, and avoid the gun head from touching the position to be welded; at the same time, adjust the position of the deep hole welding gun and the swing amplitude of the gun head, so that the gun head is 8mm away from the step surface, and the swing amplitude of the gun head is equal to the width of the position to be welded, and record the angle β between the axis of the threaded ring and the horizontal plane and the position of the deep hole welding gun on the welding manipulator;

[0010] Step 4: Remove the threaded ring from the welding positioner, clean the position to be welded, and then put the threaded ring into the heating furnace for preheating;

[0011] Step 5. Take the threaded ring out of the heating furnace and mount it on the chuck of the welding positioner. Adjust the welding positioner and the deep hole welding gun to the state in step 3. Rotate the chuck of the welding positioner and use the deep hole welding gun to perform surfacing welding on the step surface. After surfacing welding, place the threaded ring in the heating furnace for even temperature.

[0012] Compared with the prior art, the present invention has the following effects:

[0013] 1. The present invention ensures the surfacing quality of the threaded ring by applying automated welding equipment, greatly improves the actual production efficiency, reduces labor costs, and improves product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the step surface of the inner hole of the cladding thread ring of the present invention.

[0015] In the figure: 1. Welding positioner; 2. Deep hole welding gun. DETAILED DESCRIPTION

[0016] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Specific implementation method 1: Combination Figure 1 To illustrate this embodiment, a method for surfacing a step surface of an inner hole of a threaded ring in this embodiment is specifically performed according to the following steps:

[0018] Step 1: Clamp the threaded ring onto the chuck of the welding positioner 1;

[0019] Step 2: Install the deep hole welding gun 2 on the welding manipulator, and the gun body of the deep hole welding gun 2 is parallel to the horizontal plane;

[0020] Step 3: Adjust the welding positioner 1 to tilt the axis of the threaded ring, insert the deep hole welding gun into the inner hole of the threaded ring, and avoid the gun head from touching the position to be welded; at the same time, adjust the position of the deep hole welding gun 2 and the swing amplitude of the gun head, so that the gun head is 8mm away from the step surface, and the swing amplitude of the gun head is equal to the width of the position to be welded, and record the angle β between the axis of the threaded ring and the horizontal plane and the position of the deep hole welding gun 2 on the welding manipulator;

[0021] Step 4: Remove the threaded ring from the welding positioner 1, clean the position to be welded, and then put the threaded ring into a heating furnace for preheating. The preheating time is 1.5 hours and the preheating furnace temperature is 350°C.

[0022] Step 5. Check whether the ion gas, powder feeding gas and shielding gas of the deep hole welding gun 2 are unobstructed, clean the nozzle of the welding gun to avoid leakage or nozzle blockage during subsequent welding. The threaded ring is taken out of the heating furnace and mounted on the chuck of the welding positioner 1. The welding positioner 1 and the deep hole welding gun 2 are adjusted to the state in step 3. The chuck of the welding positioner 1 rotates, and the deep hole welding gun 2 performs cladding on the step surface. During the welding process, the swing state of the deep hole welding gun 2 should be observed at all times to ensure that the nozzle does not touch the welding position. The forming state of the weld bead and the state of the molten pool should also be observed. When the weld pattern is too dense or too wide, the welding speed needs to be increased or decreased. When the cladding height exceeds 6 mm, the arc can be stopped to complete the welding. After slightly grinding the arc closing position, the threaded ring is placed in the heating furnace for even temperature, and the even temperature time is 2 hours.

[0023] In this embodiment, the deep hole welding gun 2 is a QLA-120W precision powder plasma deep hole welding gun spray welding equipment, and the spray welding equipment is a general-purpose powder plasma spray welding machine.

[0024] The welding positioner 1 is a KP1T CNC welding positioner produced by Tangshan Kaiyuan Automatic Welding Equipment Co., Ltd.

[0025] Specific implementation method 2: Combination Figure 1 To illustrate this embodiment, in step 3 of this embodiment, the angle β between the axis of the threaded ring and the horizontal plane is 23°. Other components and connection methods are the same as those in the first embodiment.

[0026] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for surfacing the step surface of the inner hole of a threaded ring, characterized in that: The method is specifically carried out in the following steps: Step 1: Clamp the threaded ring onto the chuck of the welding positioner (1); Step 2: Install the deep hole welding gun (2) on the welding operation machine, and the gun body of the deep hole welding gun (2) is parallel to the horizontal plane; Step 3: Adjust the welding positioner (1) to tilt the axis of the threaded ring, insert the deep hole welding gun (2) into the inner hole of the threaded ring, and avoid the gun head from touching the position to be welded; at the same time, adjust the position of the deep hole welding gun (2) and the swing amplitude of the gun head, so that the gun head is 8 mm away from the step surface, and the gun head swing amplitude is equal to the width of the position to be welded, and record the angle β between the axis of the threaded ring and the horizontal plane and the position of the deep hole welding gun (2) on the welding operation machine; Step 4: Remove the threaded ring from the welding positioner (1), clean the position to be welded, and then place the threaded ring in a heating furnace for preheating; Step 5: After the threaded ring is taken out of the heating furnace, it is clamped on the chuck of the welding positioner (1). The welding positioner (1) and the deep hole welding gun (2) are adjusted to the state in step 3. The chuck of the welding positioner (1) is rotated, and the deep hole welding gun (2) performs cladding welding on the step surface. After the cladding welding is completed, the threaded ring is placed in the heating furnace for temperature equalization.

2. A method for surfacing the step surface of the inner hole of a threaded ring according to claim 1, characterized in that: In step three, the angle β between the axis of the thread ring and the horizontal plane is 23°.

3. A method for surfacing the step surface of the inner hole of a threaded ring according to claim 2, characterized in that: The preheating furnace temperature in step 4 is 350°C.

4. A method for surfacing the step surface of the inner hole of a threaded ring according to claim 3, characterized in that: The preheating time in step 4 is 1.5 hours.

5. A method for surfacing the step surface of the inner hole of a threaded ring according to claim 4, characterized in that: The temperature equalization time in step 5 is 2 hours.

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