A method for controlling the position of an injection hole of a double-layer complex structure nozzle

Abstract

The present application belongs to the technical field of nozzle oil injection hole position welding, and particularly relates to a control method for the position of an oil injection hole of a double-layer complex structure nozzle, comprising the following steps: controlling the distance between the center of an oil injection hole on an inner oil injector and the welding positioning end face of an oil collecting ring shell, adjusting the assembly gap, and ensuring that the oil injection hole is not blocked during assembly; adjusting the placement position of the parts in a vacuum brazing furnace to ensure that the oil injection hole is not blocked during vacuum brazing; judging the oil injection hole deviation direction according to the distance between the center of the inner oil injection hole and the outer oil collecting ring hole edge; determining the circumferential weld segmentation welding sequence of the argon arc welding seam according to the oil injection hole deviation direction; and placing the parts in water to carry out liquid argon arc welding. The position of the outer layer of the nozzle shell and the inner oil injector can be greatly reduced, the problem that the circumferential oil injection hole of the inner oil injector is blocked is avoided, and the purpose of controlling the position of the circumferential oil injection hole of the inner layer of the complex double-layer structure nozzle to meet the design requirements is achieved.

Description

Technical Field

[0001] This invention belongs to the field of nozzle injection hole position welding technology, specifically relating to a method for controlling the position of the injection hole of a double-layer complex structure nozzle. Background Technology

[0002] like Figure 1-2 The nozzle shown is a complex double-layer structure for a certain type of engine. The inner injector outlet consists of multiple small injection holes 6 evenly distributed around its circumference. The outer layer of the injection holes is designed with an oil collecting ring shell 1, which must ensure that the oil collecting ring holes 7 on the oil collecting ring shell correspond to the positions of the inner injection holes 6. The oil inlet cap 3 is vacuum brazed to the inner injector and connected to the outer shell 2 by an argon arc weld 4. The right end of the outer shell 2 is welded to the oil collecting ring shell 1 by a vacuum brazed weld 5, forming the nozzle assembly.

[0003] In the existing nozzles, the inner injector and the inlet cap 3, as well as the outer shell 2 and the oil collecting ring shell 1, are all vacuum brazed during welding. During assembly and vacuum brazing, inadequate control can occur, causing some of the injection holes 6 to deviate or even be completely blocked. After vacuum brazing, since the inner injector and the inlet cap 3 are already brazed together, and the oil collecting ring and the outer shell are also brazed together, when the outer shell 2 and the inlet cap 3 are subsequently argon arc welded, the deformation of the welding affects the inner injector, causing the oil collecting ring shell 1 to block the injection holes 6. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling the position of the oil injection hole of a nozzle with a complex double-layer structure, which solves the problem of the oil injection hole of the inner layer injector being blocked when the outer shell is welded by argon arc welding.

[0005] This invention is achieved through the following technical solution:

[0006] A method for controlling the position of the injection hole in a double-layer complex structure nozzle includes the following steps:

[0007] S1. Control the distance between the center of the injection hole on the inner layer injector and the welding positioning end face of the oil collection ring shell, adjust the assembly gap, and ensure that the injection hole is not blocked during the assembly process.

[0008] S2. Adjust the placement of the parts in the vacuum brazing furnace to ensure that the oil spray holes are not blocked during the vacuum brazing process;

[0009] S3. Determine the direction of the spray hole offset based on the distance between the center of the inner spray hole and the edge of the outer oil collecting ring hole;

[0010] S4. Determine the welding sequence of the circumferential weld segment of the argon arc weld according to the offset direction of the oil injection hole.

[0011] S5, the part is placed in water, and the argon arc welding in liquid is carried out.

[0012] Further, in S1, the distance between the center of the oil injection hole and the welding positioning end face of the oil collecting ring shell is 0.03-0.08 mm.

[0013] Further, in S2, the placement position of the part in the vacuum brazing furnace is adjusted, specifically, the original nozzle is placed and adjusted to be hung with the circumferential oil injection end upward.

[0014] Further, in S3, the offset direction of the oil injection hole is specifically:

[0015] Some oil injection holes are offset to the nozzle end face direction, or away from the nozzle end face direction, or in the circumferential direction.

[0016] Further, in S4, it is specifically:

[0017] S4.1, the circumferential welding position of the argon arc welding seam is segmented;

[0018] S4.2, whether the hole position of the oil injection hole is correct before the argon arc welding seam is welded is observed, and the welding sequence of each segmented position of the argon arc welding seam is determined according to the observation.

[0019] Further, if the hole position of the oil injection hole is not skewed, the welding sequence in S5 is: first, positioning the left and right positioning points of the argon arc welding seam, and then symmetrically positioning the front and rear positioning points;

[0020] Then, symmetrically weld a continuous welding seam near the left positioning point position and a continuous welding seam near the right positioning point position, and after welding, the nozzle is fully cooled;

[0021] Then, symmetrically weld the front and rear direction welding seams, and finally complete the welding of the remaining part of the welding seam, which only needs to be symmetrically welded without considering the sequence of the welding position;

[0022] And after each welding seam is welded, the part is fully cooled.

[0023] Further, if the oil collecting ring hole is offset from the inner oil injection hole, the welding sequence in S5 is:

[0024] First, according to the offset direction, analyze and determine the change direction of the linkage inner oil injector caused by the deformation of each welding of the circumferential segment of the argon arc welding seam 4 at the oil inlet cover and the outer shell, select the welding section at the part of the opposite direction of the oil injector offset, and after welding, make the nozzle fully cooled, and after the welding deformation pulls the position to be correct, symmetrically weld the remaining part of the welding seam.

[0025] Further, the process parameters of the welding are determined according to the thickness and material of different welding parts, and the appropriate parameters are determined and fixed through welding test before formal part welding.

[0026] Further, in S2, the process parameters of the vacuum brazing are as follows: temperature: 1080±10 DEG C, holding time: 10-20 min, vacuum cooling to below 900 DEG C, and air cooling to below 100 DEG C.

[0027] Further, when the argon arc welding is used to weld the butt joint, a V-shaped groove is formed.

[0028] Compared with the prior art, the present application has the following beneficial technical effects:

[0029] The application discloses a control method for the position of an oil injection hole of a double-layer complex structure nozzle, and the method avoids the problem of shielding of the oil injection hole during assembly of a single piece by controlling the distance between the circumferential distribution hole of the oil collecting ring and the positioning end face size and the distance between the oil injection hole of the inner oil injector and the positioning end face size during the manufacturing process of the double-layer complex structure nozzle; the problem of shielding of the oil injection hole caused by the vacuum brazing process is avoided by controlling the nozzle assembly process and the placement position in the furnace; and the problem of shielding of the oil injection hole caused by the deformation of the inner oil injector during the argon arc welding process is avoided by controlling the welding sequence of each section of the circumferential argon arc welding seam between the oil inlet cover and the outer shell. The position of the nozzle shell outer layer and the inner oil injector can be greatly reduced by using the control method, the problem of shielding of the circumferential oil injection hole of the inner oil injector is avoided, and the purpose of controlling the position of the circumferential oil injection hole of the inner layer of the complex double-layer structure nozzle to meet the design requirements is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram for assembly and welding of the oil injection hole of the double-layer nozzle;

[0031] Figure 2 It is a schematic diagram of A of Figure 1

[0032] Figure 3 It is the placement direction of the nozzle in the vacuum brazing furnace;

[0033] Figure 4 It is the offset direction of the oil injection hole relative to the hole of the oil collecting ring; a diagram is that the oil injection hole is offset to the nozzle end face direction, and b diagram is that the oil injection hole is offset to the direction away from the nozzle end face;

[0034] Figure 5 It is a sectional area diagram of the argon arc welding when the oil injection hole does not occur skew;

[0035] Figure 6 It is a sectional area diagram of the argon arc welding when the oil injection hole occurs skew;

[0036] ​Wherein, 1, oil collecting ring shell; 2, outer shell; 3, oil inlet cover, 4, argon arc welding seam, 5, brazing welding seam; 6, oil injection hole; 7, oil collecting ring hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application, that is, the described examples are only a part of the examples of the present application, but not all examples.

[0038] The components described and shown in the drawings and examples of the present application can be arranged and designed in various different configurations, therefore, the detailed description of the examples of the present application provided in the following drawings is not intended to limit the scope of the claimed present application, but only to represent a selected embodiment of the present application. Based on the drawings and examples of the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0039] It should be noted that the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, element, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or further includes the elements inherent in the process, element, method, article or equipment. In addition, the terms "horizontal", "vertical" are based on the orientation and position relationship of the devices or components shown in the drawings, and are only for better description of the present application, and are not required to have the specific orientation of the devices, components or equipment shown, and therefore cannot be understood as a limitation of the present application.

[0040] The present application discloses a control method for the position of the oil injection hole of a double-layer complex structure nozzle, comprising the following steps:

[0041] S1, control the distance between the center of the oil injection hole 6 on the inner layer oil injector and the welding positioning end face of the oil collecting ring shell 1, adjust the assembly gap, and ensure that the oil injection hole 6 is not blocked during assembly;

[0042] S2, adjust the placement position of the parts in the vacuum brazing furnace to ensure that the oil injector hole is not blocked during vacuum brazing;

[0043] S3, determine the offset direction of the oil injection hole 6 according to the distance between the center of the inner layer oil injection hole 6 and the edge of the outer layer oil collecting ring hole 7;

[0044] S4, determine the circumferential welding seam segmentation welding sequence of the argon arc welding seam 4 according to the offset direction of the oil injection hole 6;

[0045] S5, the part is put into water, and liquid argon arc welding is carried out. In the argon arc welding, the part is welded in water, so that the heat input during welding is reduced, and welding deformation is reduced.

[0046] The present application firstly guarantees that the oil injection hole 6 is not blocked during assembly by controlling the size of a single piece, then controls the placement position of the vacuum brazing furnace, controls the brazing process of the inner layer oil injector and the oil inlet cover 3 and the oil collecting ring to avoid the oil injection hole 6 being blocked as much as possible, and finally controls the segmented welding of the outer layer oil inlet cover 3 and the circumferential argon arc weld of the outer layer shell, and adjusts the welding sequence to solve the problem of the oil injection hole 6 being blocked.

[0047] If the hole position of the oil injection hole 6 is not skewed, the welding sequence in S5 is: first, positioning the left and right positioning points of the argon arc weld 4, and then symmetrically positioning the front and rear positioning points before welding;

[0048] Then, symmetrically weld a continuous weld near the left positioning point position and a continuous weld near the right positioning point position, and fully cool the nozzle after welding;

[0049] Then, symmetrically weld the front and rear direction weld segments, and finally complete the welding of the remaining welds. Only symmetric welding is required, and the welding position sequence is not considered;

[0050] And after each weld is welded, the part is fully cooled.

[0051] If the oil collecting ring hole 7 is offset from the inner layer oil injection hole 6, the welding sequence in S5 is:

[0052] First, according to the offset direction, analyze and determine the change direction of the linkage inner layer oil injector caused by the deformation of each circumferential segment of the argon arc weld 4 between the oil inlet cover 3 and the outer layer shell, select the welding segment at the position opposite to the offset direction of the oil injector, and fully cool the nozzle after welding, and then symmetrically weld the remaining position weld after the welding deformation pulls the position to the right.

[0053] The features and performance of the present application are further described in detail in conjunction with the following examples.

[0054] Example 1

[0055] The nozzle of a certain type is as follows Figure 1 and 2 As shown, the oil inlet cover 3, the outer layer shell, the oil collecting ring shell 1, and the inner layer oil injector are formed by vacuum brazing and argon arc welding.

[0056] 1) The distance between the circumferential oil injection hole 6 of the inner layer oil injector and the end face is calculated theoretically, and the distance between the circumferential hole of the oil collecting ring and the positioning end face is the same size, and the brazing gap is controlled to be 0.05mm;

[0057] 2) Assemble the inner injector into the outer housing. The two ends of the injector protrude outwards. One end is assembled with the oil inlet cap 3, and the other end is assembled with the oil collection ring housing 1. Vacuum brazing is then performed.

[0058] 3) Press down the nozzle inlet furnace orientation. Figure 3 As shown, the circumferential spray nozzle should be suspended with the spray nozzle facing upwards to avoid eccentricity during welding due to its weight, which could obstruct the hole. The vacuum brazing process parameters are: temperature: 1080℃, holding time: 10 min, vacuum cooling to below 900℃, and air cooling to below 100℃.

[0059] 4) After vacuum brazing, wait for argon arc welding. Figure 1 When inspecting the argon arc weld 4 shown, it was found that the circumferential hole of the oil collecting ring shell 1 of the part was not misaligned with the oil injection hole 6 on the inner layer injector.

[0060] 5) For nozzles that do not exhibit skewness, to prevent skewness caused by changes in the inner layer of the injector during the argon arc welding process of seam 4, the welding method used is as follows: Figure 5 As shown, the argon arc weld seam 4 is evenly divided into 8 segments along the circumference;

[0061] The welding sequence is as follows: first, symmetrically tack weld the left and right end locating points, then symmetrically tack weld the front and rear locating points; then weld symmetrically respectively. Figure 5 After welding a continuous section of weld seam near the left and right positions of the marked point, allow the nozzle to cool fully; then weld the weld seam sections in the front and back directions symmetrically.

[0062] Finally, complete the welding of the remaining seams, such as... Figure 5 The welding process is shown in section 1, followed by section 2, then section 3, and finally section 4. All welds are performed underwater, and the intervals between welds are kept as short as possible.

[0063] Example 2

[0064] The following is a diagram of a certain type of nozzle. Figure 1 and 2 As shown, it is made of oil inlet cap 3, outer shell, oil collection ring outer shell 1, and inner injector through vacuum brazing and argon arc welding.

[0065] 1) The distance between the inner layer injector's circumferential injection hole 6 and the end face is calculated theoretically and is consistent with the distance between the oil collection ring's circumferential hole and the positioning end face. The brazing gap is controlled at 0.08mm.

[0066] 2) Assemble the inner injector into the outer housing. The two ends of the injector protrude outwards. One end is assembled with the oil inlet cap 3, and the other end is assembled with the oil collection ring housing 1. Vacuum brazing is to be performed. The process parameters for vacuum brazing are: temperature: 1090℃, heat preservation: 20min, vacuum cooling to below 900℃, and air cooling to below 100℃.

[0067] 3) Nozzle into the furnace placement direction press down Figure 3 As shown, the circumferential oil injection end is hung upward to avoid eccentricity and blockage of the hole during the welding process due to the weight of the nozzle.

[0068] 4) After vacuum brazing, wait for argon arc welding Figure 1 As shown in the argon arc welding seam 4, the inner nozzle oil injector oil injection hole 6 is offset to the nozzle end surface direction relative to the oil collecting ring hole 7 (about 3 holes evenly distributed in the lower direction), as shown in a, the offset direction of the 3 holes evenly distributed on the opposite side of the lower direction is just opposite to the position of the lower direction view, as shown in b. Figure 4 Figure 4

[0069] 5) For the nozzle with the offset nozzle inner oil injector oil injection hole 6, the circumferential weld is divided into four sections during argon arc welding as shown in the welding seam 4, and welding is performed, as shown in the figure. The specific welding sequence is as follows: Figure 6

[0070] First, the rear section of the weld is welded in water, and after sufficient cooling, the upper end of the inner oil injector is pulled backward and the lower section is pushed forward due to the shrinkage deformation during welding, thereby adjusting the position of the oil injector oil injection hole 6;

[0071] Then symmetrically weld the left and right section welds, and the interval between the two welds is as short as possible, and after sufficient cooling, the front section of the weld is finally welded.

[0072] The welding process parameters are determined by welding test before formal part welding according to the thickness and material of different welding parts.

[0073] In S2, the process parameters of vacuum brazing are: temperature: 1080±10℃, holding time: 10-20min, vacuum cooling to below 900℃, and air cooling to below 100℃.

[0074] Argon arc welding of high-temperature alloy butt weld with a thickness of 2.5mm, v-shaped groove, and Diameter of welding wire, welding current 50±5A, to ensure weld penetration, first use the lower limit current and small diameter welding wire to lay the foundation, then fill a layer, and finally complete the welding.

[0075] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modification or equivalent replacement within the spirit and scope of the present application should be covered by the protection scope of the claims of the present application.​​​

Claims

1. A method for controlling the position of an injection hole of a double-layer complex-structure nozzle, characterized by, The outer side of the oil injection hole (6) is provided with an oil collecting ring shell (1), and a plurality of oil collecting ring holes (7) are formed on the oil collecting ring shell (1); the oil injection hole (6) is formed on the inner layer oil injector, the inner layer oil injector, the oil inlet cover (3), the outer layer shell (2) and the oil collecting ring shell (1) are all connected by vacuum brazing, and the oil inlet cover (3) and the outer layer shell (2) are connected by an argon arc welding seam (4); The control method comprises the following steps: S1, control the distance between the center of the oil injection hole (6) on the inner layer oil injector and the welding positioning end face of the oil collecting ring shell (1), adjust the assembly gap, and ensure that the oil injection hole (6) is not blocked during assembly; S2, adjust the placement position of the parts in the vacuum brazing furnace to ensure that the oil injection hole (6) is not blocked during vacuum brazing; S3, according to the distance between the center of the oil injection hole (6) and the edge of the outer oil collecting ring hole (7), determine the offset direction of the oil injection hole (6); S4, according to the offset direction of the oil injection hole (6), determine the welding sequence of the circumferential welding seam of the argon arc welding seam (4); S5, place the parts in water and carry out liquid argon arc welding; In S4, specifically: S4.1, segment the circumferential welding position of the argon arc welding seam (4); S4.2, observe whether the hole position of the oil injection hole (6) is correct before the argon arc welding seam (4) is welded, and determine the welding sequence of each segment position of the argon arc welding seam (4) according to the observation; If the hole position of the oil injection hole (6) is not skewed, the welding sequence in S5 is: first position the left and right positioning points of the argon arc welding seam (4), and then symmetrically position the front and rear positioning points before welding; Then symmetrically weld a continuous section of welding seam near the left positioning point position and a continuous section of welding seam near the right positioning point position, and fully cool the nozzle after welding is completed; Then directly symmetrically weld the front and rear direction welding seam segments, and finally complete the welding of the remaining part of the welding seam, which only needs to be symmetrically welded without considering the sequence of the welding position; And after each segment of the welding seam is welded, the parts are fully cooled; If the oil collecting ring hole (7) and the oil injection hole (6) are offset, the welding sequence in S5 is: First, according to the offset direction, analyze and determine the change direction of the inner layer oil injector caused by the deformation of each segment of the circumferential segment of the argon arc welding seam (4) at the oil inlet cover (3) and the outer layer shell, select the welding segment at the part in the opposite direction of the oil injector offset, and make the nozzle fully cool after welding, and then symmetrically weld the remaining part of the welding seam after the position is pulled to the right by the welding deformation.

2. The method of claim 1, wherein the method is characterized by: In S1, the distance between the center of the oil injection hole (6) and the welding positioning end face of the oil collecting ring shell (1) is 0.03-0.08mm.

3. The method of claim 1, wherein the method is characterized by: In S2, the placement position of the parts in the vacuum brazing furnace is adjusted, specifically: the original nozzle is placed and adjusted to be hung with the circumferential oil injection end facing up.

4. The method of controlling the position of the injection hole of a double-layer complex structure nozzle according to claim 1, wherein In S3, the offset direction of the oil injection hole (6) is specifically: Some oil injection holes (6) are offset towards the nozzle end face, or away from the nozzle end face, or in the circumferential direction.

5. The method of controlling the position of the injection hole of a double-layer complex structure nozzle according to claim 1, wherein The welding process parameters are determined according to the thickness and material of different welding parts before formal part welding, and the appropriate parameters are determined and fixed.

6. The method of controlling the position of the injection hole of a double-layer complex structure nozzle according to claim 1, wherein In S2, the process parameters of vacuum brazing are as follows: temperature: 1080±10℃, holding time: 10-20min, vacuum cooling to below 900℃, and air cooling to below 100℃.

7. The method of controlling the position of the injection hole of a double-layer complex structure nozzle according to claim 1, wherein When argon arc welding is used to weld butt joint, v-shaped groove is used.

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