CN114178353A - Deformation correction method for welding position of nozzle type casting - Google Patents
Deformation correction method for welding position of nozzle type casting Download PDFInfo
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- CN114178353A CN114178353A CN202111535189.0A CN202111535189A CN114178353A CN 114178353 A CN114178353 A CN 114178353A CN 202111535189 A CN202111535189 A CN 202111535189A CN 114178353 A CN114178353 A CN 114178353A
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- deformation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
- B21C51/005—Marking devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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Abstract
The invention provides a method for correcting deformation of a welding part of a nozzle type casting, which relates to the field of deformation correction of precision investment castings, and aims to correct the deformation of the welding part of the nozzle type casting by combining the heating characteristic of acetylene-oxygen according to the problems that a correction heat affected zone of the nozzle type precision casting is large and the correction effect cannot be rapidly detected; the correction effect of the nozzle welding piece can be rapidly detected and the reverse deformation can be resisted, and the problems that the nozzle welding piece is difficult to correct and detect and determine the heating range are solved; the correction method can improve the qualification rate and the correction efficiency of the nozzle welding parts, can meet the product quality requirement, and simultaneously meets the requirement of rapid flow in production. The invention solves the problem that the position degree of the deformed part is difficult to detect after correction and provides a controllable correction method. The problems that the thick part of the nozzle structural part is difficult to correct, difficult to detect, difficult to determine the heating range and the like are effectively solved.
Description
Technical Field
The invention relates to the field of deformation correction of precision investment castings, in particular to a method for correcting deformation of welding positions of nozzle castings.
Background
The nozzle structural member manufactured by adopting the precision investment casting method is easy to deform after a welding procedure, the thick part of the nozzle structural member is difficult to successfully correct once due to low tempering temperature of heat treatment, and the repeated correction wastes time and is unfavorable for the performance of a casting. If the correcting die is used for correcting the thick and large part, the thin wall part or the connecting part of the structural part is easy to be subjected to thermal deformation; the final qualified rate of the repair welding part is low by correcting the welding part in this way. And the flame straightening method is adopted, and the specific method of flame straightening is to heat the part of the deformed structural part, namely the extended part of the deformed part to a certain temperature, and utilize the characteristics of metal expansion and contraction and the property of plastic deformation to use oxygen-acetylene flame to cause structural deformation in a non-uniform heating mode to correct the original residual deformation. However, the accurate heating position, the proper heating temperature, the proper heating depth, the correct correction sequence and the reasonable heating mode are not researched, the operation is improper, the technical problems of tissue change, performance decline or new deformation are caused, and the correction effect cannot be rapidly evaluated on site.
Disclosure of Invention
Aiming at the problem that the nozzle welding part structural part in the prior art is difficult to correct, the invention provides a method for correcting the deformation of the welding part of the nozzle casting, which solves the problem that the position degree of the corrected deformation part is difficult to detect and provides a controllable correction method. The problems that the thick part of the nozzle structural part is difficult to correct, difficult to detect, difficult to determine the heating range and the like are effectively solved.
The invention is realized by the following technical scheme:
a deformation correction method for a welding position of a nozzle casting comprises the following steps:
step 3, fixedly assembling the repair welding casting on a tool, and exposing a deformed part;
and 4, heating the deformation part by using a flame core, knocking and correcting the deformation position along the marked position after the deformation part is red, placing the repair welding casting in a detection device for limited deformation after the deformation position is knocked and is superposed with the marked position, and finishing correction work after the repair welding casting is cooled.
Preferably, in step 1, the diameter of the connecting ends of the nozzle type castings is smaller than the diameter between the connecting ends of the repair-welded castings, and the deformation part is formed at the connecting position.
Preferably, in the step 2, the center dimension of the deformation part is scribed and compared with the qualified casting to obtain the deformation position and the deformation amount according to the line spacing.
Preferably, in the step 2, the expansion range of the deformation position corresponding to the standard casting is 5 mm.
Preferably, in step 4, heating is carried out by means of an acetylene-oxygen apparatus using a flame kernel in the marked range.
Further, the acetylene-oxygen device adopts a heating gun.
Preferably, in the step 4, after heating, an infrared temperature measuring device is adopted to detect the heating temperature, when more than 85% of the area of the marked range reaches 500-600 ℃, and the deformed part is flushed with water to correct the knocking of the marked part.
Further, the aluminum hammer is adopted to perform knocking correction on the marked part along the offset of the central line in the opposite direction.
Preferably, in step 4, the correction dimension-memorability of the deformed portion is detected by detecting the levelness of the drawn line portion using a guide.
Preferably, in step 4, the corrected repair-welded casting is placed in a detection device, and the deformation part of the repair-welded casting is limited by a limit structure of the detection device to generate rebound deformation until the deformation part is completely cooled.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for correcting deformation of a welding part of a nozzle type casting, which is used for correcting by combining the heating characteristic of acetylene-oxygen according to the problems that a correction heat affected zone of a nozzle type precision casting is large and the correction effect cannot be rapidly detected; the correction effect of the nozzle welding piece can be rapidly detected and the reverse deformation can be resisted, and the problems that the nozzle welding piece is difficult to correct and detect and determine the heating range are solved; the correction method can improve the qualification rate and the correction efficiency of the nozzle welding parts, can meet the product quality requirement, and simultaneously meets the requirement of rapid flow in production.
Furthermore, the center dimension marking line of the deformation part is compared with the qualified casting to obtain the deformation position and the deformation amount according to the line spacing, the deformation position and the deformation amount are obtained through reference and standard part determination, the part needing to be corrected is marked, and the correction efficiency is improved.
Further, the flame core is adopted by the acetylene-oxygen device to heat within the marking range, and the correction is carried out through the heating characteristic, so that the deformed part is convenient to recover to the size of the standard part through the heating correction.
Furthermore, the guiding rule is adopted to detect the levelness of the marking part and detect the correction dimension memorability of the deformed part, so that the accuracy of the recovery of the deformed part is improved.
Furthermore, the repair welding casting after correction is placed in the detection device, the deformation part of the repair welding casting is limited by the limiting structure of the detection device to be subjected to rebound deformation, the deformation part of the repair welding casting is prevented from being subjected to rebound deformation, and the correction structure of the repair welding casting after correction is ensured.
Drawings
FIG. 1 is a schematic view showing deformation of a welding portion of a nozzle type casting according to the present invention.
In the figure: 1-nozzle type casting; and 2, repair welding the casting.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in one embodiment of the present invention, a method for correcting deformation of a welding portion of a nozzle-type casting is provided, which solves the problem that the position degree of the corrected deformation portion is difficult to detect, and provides a controllable correction method. The problems that the thick part of the nozzle structural part is difficult to correct, difficult to detect, difficult to determine the heating range and the like are effectively solved.
Specifically, the deformation correction method for the welding position of the nozzle casting comprises the following steps:
specifically, in step 1, the diameter of the connecting end of the nozzle type casting 1 is smaller than the diameter between the connecting ends of the repair-welded castings 2, and a deformation part is formed at the connecting position.
specifically, in the step 2, the center dimension marking line of the deformation part is compared with the qualified casting to obtain a deformation position and a deformation amount according to the line spacing; wherein the deformation position corresponds to the standard casting with an expansion range of 5 mm.
Step 3, fixedly assembling the repair welding casting 2 on a tool, and exposing a deformed part;
and 4, heating the deformation part by using a flame core, knocking and correcting the deformation position along the marked position after the deformation part is red, placing the repair welding casting 2 in a detection device for limited deformation after the deformation position is knocked and is superposed with the marked position, and finishing correction work until the repair welding casting 2 is cooled.
Specifically, in step 4, the heating is performed within the marked range by using a flame kernel through an acetylene-oxygen device, wherein the acetylene-oxygen device uses a heating gun.
After heating, an infrared temperature measuring device is adopted to detect the heating temperature, when the area of more than 85% of the marking range reaches 500-600 ℃, and the deformed part is flushed with water to carry out the knocking correction of the marked part.
Wherein, the aluminum hammer is adopted to perform the knocking correction on the marked part along the offset of the central line in the opposite direction.
And detecting the correction dimension memorability of the levelness of the marking part to the deformed part by adopting a running rule.
The corrected repair welding casting 2 is placed in a detection device, and the deformation part of the repair welding casting 2 is limited by a limiting structure of the detection device to be subjected to rebound deformation until the deformation part is completely cooled.
According to the invention, the problems that the correction heat affected zone of the nozzle type precision casting is large and the correction effect cannot be rapidly detected are solved by combining the heating characteristic of acetylene-oxygen for correction; firstly, determining a deformation position and a deformation amount by adopting a standard sample comparison method, marking a part needing to be corrected, and clamping a casting on a special correction tool to ensure that the part needing to be corrected is exposed without shielding and the casting is smooth and fastened. The marked part is locally heated to 500-600 ℃ by adopting acetylene-oxygen, an infrared temperature measuring device monitors the middle position of the deformed part knocked by the aluminum hammer, a guiding rule is adopted to detect the correction effect, when the guiding rule displays that the clearance tolerance range of the aluminum hammer and a standard part is within, a red hot casting clamped by a clamp is placed in a special detection device, the casting is prevented from deforming again by a peripheral limiting device, and the casting is a qualified casting after being cooled, so that the use requirement of a repair welding casting is met.
Example 1
Nozzle shell
1) The nozzle shell is connected with the repair welding casting 2 in a welding mode, a deformation position is formed at the welding position, and the repair welding casting 2 of the nozzle shell is polished in appearance, so that the repair welding position is smooth and flat.
2) And marking the center size of the hole on the deformed part, comparing the hole with a standard qualified part, determining the deformation position and the deformation amount of the welding part according to the line spacing, and carrying out contour marking by expanding the deformation range by 5mm in a circle.
3) And (3) mounting the marked repair welding casting 2 on the correction tool, wherein the part needing to be corrected is completely exposed, so that the casting level is ensured, and meanwhile, fastening a welding part on the correction tool.
4) And (3) opening an acetylene-oxygen device (heating gun), heating in a marking range by adopting a flame core, detecting the heating temperature by adopting an infrared temperature measuring device, rotating the acetylene-oxygen device (heating gun), when 95% of the area in the marking range reaches 600 ℃, and the center of the thick part is red, and knocking and correcting in the center of the marked part by adopting an aluminum hammer along the opposite direction of the linear distance.
5) And detecting the levelness of the marking part by adopting the guiding rule, and knocking until the gap between the guiding rule and the repair welding casting 2 reaches a standard gap value.
6) The red hot welding piece is clamped by the pliers and placed in a special detection device, and the secondary deformation of the casting piece is limited by the peripheral limiting devices until the correction piece is completely cooled.
7) And carrying out heat treatment according to the technological specification requirement of the nozzle shell, removing welding and correcting stress.
Example 2
Connecting nozzle
1) The welding nozzle is connected with the repair welding casting 2 in a welding mode, a deformation position is formed at the welding position, and the repair welding casting 2 of the welding nozzle is polished, so that the repair welding position is smooth and tidy.
2) And marking the center size of the deformation position, comparing with a standard qualified piece, determining the deformation position and the deformation amount of the welding piece according to the line spacing, and enlarging the deformation range by about 5mm for one circle to carry out contour marking.
3) The marked repair welding casting 2 is arranged on the correction tool, so that the part needing to be corrected is completely exposed and is not shielded, and the welding part is fastened on the correction tool in the horizontal state of the casting.
4) And (3) opening an acetylene-oxygen device (heating gun), heating in a marking range by adopting a flame core, detecting the heating temperature by adopting an infrared temperature measuring device, rotating the acetylene-oxygen device (heating gun), knocking and correcting the center of the marked part by adopting an aluminum hammer along the opposite direction of the linear distance when 90% of the area of the marking range reaches 550 ℃ and the relatively thick part is red.
5) And detecting the levelness of the scribing part by adopting the guiding rule, and knocking until the clearance between the guiding rule and a welding part reaches a standard clearance value.
6) The red hot welding piece is clamped by the pliers and placed in a special detection device, and the secondary deformation of the casting piece is limited by the peripheral limiting devices until the correction piece is completely cooled.
7) Tempering treatment is carried out according to the requirements of the technical specification of the nozzle, and welding and stress correction are carried out.
In conclusion, the invention provides a method for correcting the deformation of the welding part of the nozzle type casting, which is used for correcting by combining the heating characteristic of acetylene-oxygen according to the problems that the correction heat affected zone of the nozzle type precision casting is large and the correction effect cannot be rapidly detected; the correction effect of the nozzle welding piece can be rapidly detected and the reverse deformation can be resisted, and the problems that the nozzle welding piece is difficult to correct and detect and determine the heating range are solved; the correction method can improve the qualification rate and the correction efficiency of the nozzle welding parts, can meet the product quality requirement, and simultaneously meets the requirement of rapid flow in production.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A deformation correction method for a welding position of a nozzle casting is characterized by comprising the following steps:
step 1, welding and connecting a nozzle casting (1) and a repair welding casting (2), forming a deformation position at a welding position, and polishing the repair welding casting (2) of the nozzle casting (1) to enable the repair welding position of the repair welding casting (2) to be smooth and tidy;
step 2, marking the center size of the deformed part, comparing the center size with the qualified casting to obtain a deformed position and a deformation amount, and marking the outline after the deformed position is enlarged corresponding to the standard casting;
step 3, fixedly assembling the repair welding casting (2) on a tool, and exposing a deformed part;
and 4, heating the deformation part by using a flame core, knocking and correcting the deformation position along the marked position after the deformation part is red, placing the repair welding casting (2) in a detection device for limited deformation after the deformation position is knocked and is superposed with the marked position, and finishing the correction work until the repair welding casting (2) is cooled.
2. The method for correcting the deformation of the welding position of the nozzle casting according to the claim 1, characterized in that in the step 1, the diameter of the connecting end of the nozzle casting (1) is smaller than the diameter between the connecting ends of the repair welding castings (2), and a deformation part is formed at the connecting position.
3. The method for correcting the deformation of the welding position of the nozzle casting according to claim 1, wherein in the step 2, the center dimension of the deformation position is scribed and compared with the qualified casting to obtain the deformation position and the deformation amount according to the line spacing.
4. The method for correcting the deformation of the welding position of the nozzle casting according to claim 1, wherein in the step 2, the deformation position corresponds to a standard casting expansion range of 5 mm.
5. The method for correcting the deformation of the welding position of the nozzle casting according to claim 1, wherein in the step 4, the heating is performed by using a flame kernel in a marked range through an acetylene-oxygen device.
6. The method for correcting the deformation of the welding position of the nozzle type casting according to claim 5, wherein the acetylene-oxygen device adopts a heating gun.
7. The method for correcting the deformation of the welding position of the nozzle casting according to claim 1, wherein in the step 4, after heating, an infrared temperature measuring device is used for detecting the heating temperature, and the knocking correction of the marked position is performed when the area of the marked range is more than 85% and reaches 500-600 ℃ and the deformed position is completely red.
8. The method for correcting the deformation of the welding position of the nozzle type casting according to claim 7, wherein the marked position is knocked and corrected in a direction opposite to the offset of the center line by using an aluminum hammer.
9. The method for correcting the deformation of the nozzle type casting welding site according to claim 1, wherein in step 4, the correction dimension registration of the deformation site is detected by detecting the levelness of the marking site with a running rule.
10. The method for correcting the deformation of the welding position of the nozzle casting according to claim 1, wherein in the step 4, the corrected repair-welded casting (2) is placed in a detection device, and the deformation position of the repair-welded casting (2) is limited to have the rebound deformation through a limiting structure of the detection device until the deformation position is completely cooled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111535189.0A CN114178353A (en) | 2021-12-15 | 2021-12-15 | Deformation correction method for welding position of nozzle type casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111535189.0A CN114178353A (en) | 2021-12-15 | 2021-12-15 | Deformation correction method for welding position of nozzle type casting |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10156436A (en) * | 1996-11-21 | 1998-06-16 | Nippon Seiko Kk | Method for straightening deformation of long size member |
| CN104668317A (en) * | 2015-02-13 | 2015-06-03 | 广西桂冠电力股份有限公司大化水力发电总厂 | Shape correcting method and shape correcting device for inner guide water ring of bulb through flow type water turbine |
| CN105478531A (en) * | 2015-12-17 | 2016-04-13 | 保定天威电气设备结构有限公司 | Shaping method used after deformation of copper shield used for transformer |
| CN207254968U (en) * | 2017-09-11 | 2018-04-20 | 洛阳乾中新材料科技有限公司 | The correcting tool of casting circularity |
| CN108251624A (en) * | 2017-12-28 | 2018-07-06 | 上海交通大学 | A kind of thin-wall high temperature alloy precision casting local deformation is heat-treated antidote |
| CN111589904A (en) * | 2019-12-18 | 2020-08-28 | 中国一冶集团有限公司 | Large-diameter steel pipe correction butt joint method |
| CN112338002A (en) * | 2020-10-16 | 2021-02-09 | 中国航发北京航空材料研究院 | Local shape correction method for titanium alloy component |
| CN112605177A (en) * | 2020-12-28 | 2021-04-06 | 中车长春轨道客车股份有限公司 | Welding distortion detection and correction device for side beam of rail vehicle framework |
-
2021
- 2021-12-15 CN CN202111535189.0A patent/CN114178353A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10156436A (en) * | 1996-11-21 | 1998-06-16 | Nippon Seiko Kk | Method for straightening deformation of long size member |
| CN104668317A (en) * | 2015-02-13 | 2015-06-03 | 广西桂冠电力股份有限公司大化水力发电总厂 | Shape correcting method and shape correcting device for inner guide water ring of bulb through flow type water turbine |
| CN105478531A (en) * | 2015-12-17 | 2016-04-13 | 保定天威电气设备结构有限公司 | Shaping method used after deformation of copper shield used for transformer |
| CN207254968U (en) * | 2017-09-11 | 2018-04-20 | 洛阳乾中新材料科技有限公司 | The correcting tool of casting circularity |
| CN108251624A (en) * | 2017-12-28 | 2018-07-06 | 上海交通大学 | A kind of thin-wall high temperature alloy precision casting local deformation is heat-treated antidote |
| CN111589904A (en) * | 2019-12-18 | 2020-08-28 | 中国一冶集团有限公司 | Large-diameter steel pipe correction butt joint method |
| CN112338002A (en) * | 2020-10-16 | 2021-02-09 | 中国航发北京航空材料研究院 | Local shape correction method for titanium alloy component |
| CN112605177A (en) * | 2020-12-28 | 2021-04-06 | 中车长春轨道客车股份有限公司 | Welding distortion detection and correction device for side beam of rail vehicle framework |
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