Machining tool and machining method for limited space welding seam

Abstract

The invention relates to the technical field of nuclear power voltage stabilizers, in particular to a machining tool for a welding seam in a limited space. The machining tool for the welding seam in the limited space is used for patching the welding seam between an electric heating element sleeve and a transition sleeve and specifically comprises an adapter clamping base, a connecting base, a tool bar and a forming tool. The adapter clamping base is connected with a machine tool spindle cutter head and connected with the connecting base, the connecting base is connected with the cutter bar, and the cutter bar is connected with the forming cutter. The adapter clamping seat and the machine tool spindle cutter head are eccentrically arranged, and the connecting seat and the cutter bar are eccentrically arranged; during working, the cutter bar and the forming cutter extend into a gap between the sleeves, and the forming cutter abuts against a welding seam. The automatic repair welding device has the advantages of being suitable for operation in a small space and meeting the automatic repair welding requirement of repair.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power regulators, and in particular to a machining tool and a machining method for a weld in a confined space. Background Art

[0002] The nuclear power prototype pressurizer has multiple groups of electric heater elements evenly distributed on the 90° and 270° axial direction sides of the heating zone cylinder, arranged in a cross array. The electric heating elements are installed in the electric heating element sleeves by threaded connection, and the electric heating element sleeves and transition sleeves are welded structures. The welds between the electric heating element sleeves and transition sleeves are welded by full-position automatic argon arc welding. The gap between the sleeves is small, only 30mm. If there are quality problems with the welds, they need to be repaired. Since the maximum depth of the weld from the end face reaches 105mm, the operating gap between the sleeves is small, and the repair tools and the sleeves are prone to interference, the welds are difficult to dig and repair, and the repair process is difficult.

[0003] At present, the common method for patching the weld between the sleeve of the electric heating element and the transition sleeve is to use a rotary tool to install a sharpening pen to remove the weld metal and grind out a V-shaped repair groove. When using a rotary tool to install a sharpening pen to grind the weld, the gap between the sleeves is small, the space is limited, and it is not easy for the operator to observe around. The grinding tool and the sleeve of the electric heating element are prone to dryness, which is easy to damage the sleeve of the electric heating element; the hand-held tool patching and grinding groove is unevenly formed, affecting the quality of the repair welding; the rotary tool has a small feed amount each time, low efficiency, and a long repair cycle.

[0004] Therefore, in view of the deficiencies in the prior art, a tool for machining welds in confined spaces is provided. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a tool for machining welds in confined spaces, aiming to solve the problems of small operating space and difficult rework.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A limited space weld processing tool, used for digging and patching the weld between the sleeve of an electric heating element and a transition sleeve, comprising: an adapter holder, a connecting seat, a tool rod, and a forming knife;

[0008] The adapter holder is connected to the spindle cutter of the machine tool, the adapter holder is connected to the connecting seat, the connecting seat is connected to the tool rod, and the tool rod is connected to the forming knife;

[0009] The adapter holder is eccentrically arranged with respect to the machine tool spindle cutter head, and the connecting seat is eccentrically arranged with respect to the cutter bar;

[0010] During operation, the knife rod and the forming knife extend into the gap between the sleeves, and the forming knife abuts against the weld.

[0011] As a further improvement of the technical solution of the present invention, a square groove is provided on the side of the connecting seat, one end of the knife rod is embedded in the square groove, and the knife rod is fixed to the square groove by a screw.

[0012] As a further improvement of the technical solution of the present invention, a square through hole is provided at one end of the knife rod away from the connecting seat, and the forming knife includes a square blade body, which is installed in the square through hole by screws.

[0013] As a further improvement of the technical solution of the present invention, the forming knife is arranged perpendicular to the knife rod.

[0014] As a further improvement of the technical solution of the present invention, a notch is provided on the inward installation side of the knife rod.

[0015] As a further improvement of the technical solution of the present invention, the width of the square blade is 10mm-14mm, and the width of the square through hole is 13mm-17mm.

[0016] As a further improvement of the technical solution of the present invention, the forming knife also includes a cutting edge, and the cutting edge is a 60° symmetrical bevel shape.

[0017] As a further improvement of the technical solution of the present invention, the material of the forming knife is high-speed steel.

[0018] As a further improvement of the technical solution of the present invention, the diameter of the tool rod is 20mm-30mm, and the material of the tool rod is 42CrMo4.

[0019] A method for processing a confined space weld, applicable to the above-mentioned confined space weld processing tool, comprises the following steps:

[0020] S1: Install the tool: Use screws to connect the adapter holder and the connecting seat, fix the adapter holder on the spindle cutter head of the machine tool, use screws to connect the tool bar and the forming tool, adjust the size of the forming tool extending out of the tool bar, and install the tool bar inwards on the connecting seat;

[0021] S2: Preliminary alignment: Rotate the machine tool spindle cutter head and adjust the cutter head to ensure that the forming cutter and the machine tool spindle are basically aligned;

[0022] S3: Re-alignment: The machine tool spindle cutter head moves outward by the radius of the casing, and the forming cutter re-aligns and confirms the pit digging area of ​​the weld between the casing of a single electric heating element and the transition casing. At the same time, the machine tool spindle cutter head is rotated to simulate the alignment check. After re-confirmation, the alignment is completed;

[0023] S4: Rotate the machine tool spindle cutter head and slowly move inward to dig a groove for the weld. During the processing, observe the weld groove form and confirm the processing depth, and gradually complete the digging and filling groove forming of the weld.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the processing tool for confined space welds provided by the present invention, screws are used to connect the adapter holder and the connecting seat, the adapter holder is fixed on the machine tool spindle cutter head, screws are used to connect the tool rod and the forming knife and the size of the forming knife extending out of the tool rod is adjusted, the tool rod is installed inwardly on the connecting seat, the adapter holder and the machine tool spindle cutter head are eccentrically arranged, and the connecting seat and the tool rod are eccentrically arranged. Since the gap between the electric heating element sleeve and the transition sleeve is only 30mm, the maximum depth of the weld position from the end face is 105mm, when processing and centering, by adjusting the position of the adapter holder, it is finally ensured that the motion trajectory of the forming knife is consistent with the butt weld of each electric heater element sleeve and the transition sleeve, the machine tool spindle cutter head gradually moves inward to complete the processing feed cutting, and finally completes the digging and patching of the butt weld of a single electric heater element sleeve and the transition sleeve. The processing tool for confined space welds of the present invention has the characteristics of being suitable for smaller space operations and meeting the requirements of automatic repair welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0027] Figure 1 It is a three-dimensional structural schematic diagram of a machining tool for a confined space weld according to the present invention;

[0028] Figure 2 It is a left view of the machining tool for confined space weld of the present invention;

[0029] Figure 3 is a top view of a machining tool for a confined space weld according to the present invention;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the heating area of ​​the voltage stabilizer of the present invention;

[0031] Figure 5 It is a three-dimensional structural schematic diagram of the electric heating element in the heating zone of the voltage stabilizer of the present invention.

[0032] In the figure:

[0033] 1. Adapter holder; 2. Connecting seat; 21. Square groove; 3. Knife rod; 31. Square through hole; 32. Notch; 4. Forming knife; 41. Square blade; 42. Cutting edge; 5. Electric heating element sleeve; 6. Transition sleeve; 7. Welding seam. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0035] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0036] Reference Figures 1 to 5 , a processing tool for a weld 7 in a confined space, comprising: an adapter holder 1, a connecting seat 2, a tool rod 3, and a forming knife 4;

[0037] In one embodiment, for patching the weld 7 between the electric heating element sleeve 5 and the transition sleeve 6, the adapter holder 1 is connected to the machine tool spindle cutter disc, the adapter holder 1 is connected to the connecting seat 2, the connecting seat 2 is connected to the tool rod 3, and the tool rod 3 is connected to the forming knife 4; the adapter holder 1 is eccentrically arranged to the machine tool spindle cutter disc, and the connecting seat 2 is eccentrically arranged to the tool rod 3; when working, the tool rod 3 and the forming knife 4 extend into the gap between the sleeves, and the forming knife 4 abuts against the weld 7.

[0038] Among them, the adapter holder 1 and the connecting seat 2 are connected by screws, the adapter holder 1 is fixed on the machine tool spindle cutter head, the tool bar 3 and the forming knife 4 are connected by screws and the size of the forming knife 4 extending out of the tool bar 3 is adjusted, and the tool bar 3 is installed inwardly on the connecting seat 2. The adapter holder 1 and the machine tool spindle cutter head are eccentrically set, and the connecting seat 2 and the tool bar 3 are eccentrically set. Since the gap between the electric heating element sleeve 5 and the transition sleeve 6 is only 30mm, the maximum depth of the weld 7 position from the end face is 105mm. If the weld 7 needs to be dug and repaired, the accessibility of the weld 7 area is poor. It is difficult to use conventional grinding tools to dig and repair the weld 7, and it is difficult to meet the requirements of automatic repair welding after the repair groove is ground. During the centering and alignment of the machining, the position of the adapter holder 1 is adjusted to finally ensure that the motion trajectory of the forming knife 4 is consistent with the butt weld 7 between each electric heater element sleeve and the transition sleeve 6, and the spindle cutter head of the machine tool gradually moves inward to complete the machining feed cutting, and finally completes the digging and patching of the butt weld 7 between the single electric heater element sleeve and the transition sleeve 6. The machining tool for the confined space weld 7 of the present invention has the characteristics of being suitable for smaller space operations and meeting the requirements of automatic repair welding.

[0039] In one embodiment, a square groove 21 is provided on the side of the connecting seat 2, one end of the knife rod 3 is embedded in the square groove 21, and the knife rod 3 is fixed to the square groove 21 by screws.

[0040] In one embodiment, a square through hole 31 is provided at one end of the knife bar 3 away from the connecting seat 2, and the forming knife 4 includes a square blade 41, which is installed in the square through hole 31 by screws, and the center of the end face of the knife bar 3 is tightened and fixed by screws, and the maximum depth value of the groove processing can be controlled by the distance that the cutting edge 42 of the forming knife 4 extends out of the outer circle of the knife bar 3. The forming knife 4 is arranged vertically to the knife bar 3. The width of the square blade 41 is 12 mm, and the width of the square through hole 31 is 15 mm.

[0041] In one embodiment, a notch 32 is provided on the inward installation side of the tool bar 3. Since the machining rotation space of the tool bar 3 is limited, and the radius of the electric heating element sleeve 5 is larger than the radius at the weld 7, the tool bar 3 adopts a non-circular structure, and a part of the tool bar 3 is cut off on the inward installation side of the tool bar 3 to ensure that the tool bar 3 will not interfere with the maximum outer diameter of the electric heating element sleeve 5 after installation and rotation, and allow the machine tool rotating spindle cutter head to move inward at an appropriate distance to ensure that the peripheral welding groove can be machined.

[0042] In order to ensure the stability of the tool operation during processing and patching, the rigidity of the tool rod 3 needs to be improved. The material of the tool rod 3 is 42CrMo4. The size of the tool rod 3 is as large as possible and close to the limit interference size (the interference size is 30mm). Preferably, the diameter of the tool rod 3 is 25mm.

[0043] In one embodiment, the forming knife 4 further comprises a cutting edge 42, and the cutting edge 42 is a 60° symmetrical groove. The forming knife 4 is made of high-speed steel, such as M24.

[0044] A method for processing a confined space weld, applicable to the above-mentioned confined space weld processing tool, comprises the following steps:

[0045] S1: Install the tool: Use side fixing screws to connect the adapter holder and the connecting seat, fix the adapter holder on the spindle cutter head of the machine tool, use end screws to connect the tool bar and the forming tool, and adjust the length of the forming tool extending out of the tool bar, that is, the target value of the machining depth, and use side fixing screws to install the tool bar inwards to the connecting seat;

[0046] S2: Preliminary alignment: Rotate the machine tool spindle cutter head and adjust the cutter head to ensure that the forming cutter and the machine tool spindle are basically aligned;

[0047] S3: Re-alignment: The machine tool spindle cutter head moves outward by the radius of the sleeve (about 17 mm), and the forming cutter re-aligns and confirms the pit digging area of ​​the weld between the single electric heating element sleeve and the transition sleeve. At the same time, the machine tool spindle cutter head is rotated to simulate the alignment check. After re-confirmation, the alignment is completed;

[0048] S4: Rotate the spindle cutter of the machine tool and slowly move inward to dig a groove for the weld. During the processing, observe the weld groove form and confirm the processing depth (the distance moved inward), and gradually complete the digging and filling groove forming of the weld.

[0049] S5: After completing the patching of the butt weld between an electric heater element sleeve and a transition sleeve, readjust the machine tool and align the other weld to be patched, and repeat the above steps.

[0050] For other details of the tool for machining a weld in a confined space described in the present invention, please refer to the prior art and will not be described in detail here.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A confined space weld processing tool, used for digging and patching the weld between the sleeve of an electric heating element and the transition sleeve, characterized in that: include: Adapter holder, connecting seat, knife bar, forming knife; The adapter holder is connected to the spindle cutter of the machine tool, the adapter holder is connected to the connecting seat, the connecting seat is connected to the tool rod, and the tool rod is connected to the forming knife; The adapter holder is eccentrically arranged with respect to the machine tool spindle cutter head, and the connecting seat is eccentrically arranged with respect to the cutter bar; During operation, the knife rod and the forming knife extend into the gap between the sleeves, and the forming knife abuts against the weld.

2. A confined space weld processing tool according to claim 1, characterized in that: A square groove is provided on the side of the connecting seat, one end of the knife rod is embedded in the square groove, and the knife rod is fixed to the square groove by a screw.

3. A confined space weld processing tool according to claim 1, characterized in that: A square through hole is provided at one end of the knife rod away from the connecting seat, and the forming knife comprises a square blade body, which is installed in the square through hole by means of screws.

4. A confined space weld machining tool according to claim 1, characterized in that: The forming knife is arranged perpendicularly to the knife rod.

5. The confined space weld processing tool according to claim 1, characterized in that: The inward installation side of the knife rod is provided with a notch.

6. The tool for machining a weld in a confined space according to claim 3, characterized in that: The width of the square blade is 10mm-14mm, and the width of the square through hole is 13mm-17mm.

7. The confined space weld processing tool according to claim 1, characterized in that: The forming knife also includes a cutting edge, and the cutting edge is in a 60° symmetrical groove shape.

8. The tool for machining welds in confined spaces according to claim 1, characterized in that: The material of the forming knife is high speed steel.

9. The confined space weld machining tool according to claim 5, characterized in that: The diameter of the knife rod is 20mm-30mm, and the material of the knife rod is 42CrMo4.

10. A method for processing a confined space weld, applicable to the confined space weld processing tool according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Install the tool: Use screws to connect the adapter holder and the connecting seat, fix the adapter holder on the spindle cutter head of the machine tool, use screws to connect the tool bar and the forming tool, adjust the size of the forming tool extending out of the tool bar, and install the tool bar inwards on the connecting seat; S2: Preliminary alignment: Rotate the machine tool spindle cutter head and adjust the cutter head to ensure that the forming cutter and the machine tool spindle are basically aligned; S3: Re-alignment: The machine tool spindle cutter head moves outward by the radius of the casing, and the forming cutter re-aligns and confirms the pit digging area of ​​the weld between the casing of a single electric heating element and the transition casing. At the same time, the machine tool spindle cutter head is rotated to simulate the alignment check. After re-confirmation, the alignment is completed; S4: Rotate the machine tool spindle cutter head and slowly move inward to dig a groove for the weld. During the processing, observe the weld groove form and confirm the processing depth, and gradually complete the digging and filling groove forming of the weld.

Images