Combined spot welding method for lower cup base and gas collecting box of blade

Abstract

The invention provides a combined spot welding method for a lower cup base and a gas collecting box of a blade. The combined spot welding method comprises the following steps that the lower cup base is positioned on a tool base; a positioning pin is inserted into the positioning hole, and the upper end of the positioning pin protrudes out of the bottom wall of the lower cup base; covering a gas collection box on the positioning pin, wherein the opening of the gas collection box is in contact with the bottom wall of the lower cup base; spot welding is conducted around the opening of the gas collecting box, so that the gas collecting box is fixed to the lower cup base; and the lower cup base is taken out from the tool base, the positioning pin is pulled out from the lower portion of the lower cup base, and combined spot welding is completed. By the adoption of the tool, the lower cup base is positioned through the tool base and the positioning pin, meanwhile, the gas collecting box is positioned on the lower cup base through the positioning pin, displacement of the gas collecting box relative to the lower cup base during spot welding is avoided, and tight combination of the gas collecting box and the lower cup base is achieved; the positioning pins support the inner wall of the gas collecting box, so that the pressure resistance of the gas collecting box is improved, and the deformation of the gas collecting box is avoided; and the yield of products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing aero-engine low-pressure turbine guide blades, and in particular to a method for spot welding a lower cup seat and an air collecting box of a blade. Background Art

[0002] Vacuum brazing is widely used in the connection of hot end components of aircraft engines. For example, in the manufacturing process of low-pressure turbine guide blades for a certain type of engine, the air box and the lower cup seat are connected using a vacuum brazing process. The air box and the lower cup seat are components of the low-pressure turbine guide blades. During vacuum brazing, the workpiece to be welded is placed in a vacuum furnace as a whole and heated to the brazing temperature. Therefore, before brazing, the air box and the lower cup seat need to be combined and spot welded according to the requirements of the drawing to ensure the precise connection of the workpiece to be welded. During spot welding, a certain amount of pressure needs to be applied to make the workpiece fit tightly to ensure that the welding gun discharges smoothly and can form a fusion weld at the spot welding position.

[0003] The gas box and the lower cup seat are both thin-walled sheet metal parts, which require high assembly accuracy. However, during spot welding, due to factors such as electrode contact and arc influence, the gas box is prone to slight displacement, which has a great impact on the assembly accuracy. At the same time, if the gas box and the lower cup seat are pressurized during spot welding, it is easy to cause deformation of the workpiece, thus affecting the yield rate. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to achieve a close combination of the gas collecting box and the lower cup seat to ensure that the combination accuracy is not affected during spot welding.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides a method for spot welding a lower cup seat and a gas collecting box of a blade, comprising the following steps: A. Position the lower cup holder on the tooling base; The upper end of the tooling base is provided with an assembly surface, which is fitted with the lower side of the lower cup holder, and a positioning hole is provided on the assembly surface, and the original air collecting hole at the bottom of the lower cup holder is directly opposite to the positioning hole; B. Insert the positioning pin into the positioning hole, with the upper end of the positioning pin protruding from the bottom wall of the lower cup holder; C. Cover the gas collecting box on the positioning pin, and make the opening of the gas collecting box contact the bottom wall of the lower cup holder; D. Spot weld around the opening of the gas collecting box to fix the gas collecting box on the lower cup seat; E. Remove the lower cup holder from the tooling base, pull out the positioning pin from under the lower cup holder, and complete the combined spot welding.

[0006] The beneficial effects of the present invention are: By adopting the present invention, the lower cup seat is positioned by the tooling base and the positioning pin, and the positioning pin positions the gas collecting box on the lower cup seat, thereby avoiding displacement of the gas collecting box relative to the lower cup seat during spot welding, and the position stability of the lower cup seat is good, thereby achieving a tight combination of the gas collecting box and the lower cup seat with high combination accuracy; in addition, the positioning pin provides support for the inner wall of the gas collecting box, thereby improving the pressure resistance of the gas collecting box and avoiding deformation of the gas collecting box; and improving the product yield rate.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, there is a gap between the upper end of the positioning pin and the bottom wall of the air collecting box.

[0009] Avoid interference between the upper end of the locating pin and the gas collecting box, ensure that the opening of the gas collecting box can contact the bottom wall of the lower cup holder; at the same time, avoid spot welding stress that causes the gas collecting box to excessively hold the locating pin, ensure that the locating pin can be smoothly removed after spot welding, and avoid plastic deformation of the gas collecting box during the process of pulling out the locating pin.

[0010] Furthermore, an outer flange is provided at the opening of the gas collecting box, and the outer flange is attached to the bottom wall of the lower cup holder.

[0011] The design of the outer flange can increase the distance between the welding point and the locating pin, prevent the arc molten iron from adhering to the locating pin, reduce the resistance to removing the locating pin, and avoid tearing damage to the gas collecting box and the lower cup seat during the removal process of the locating pin.

[0012] Furthermore, the diameter of the positioning hole, the diameter of the positioning pin and the diameter of the original air collecting hole at the bottom of the lower cup holder are all equal.

[0013] It is convenient to ensure that the positioning pin can position the lower cup holder on the tooling base, thereby preventing the lower cup holder from sliding relative to the tooling base and improving the assembly accuracy.

[0014] Furthermore, the diameter of the upper end of the positioning pin is equal to the inner diameter of the air collecting box.

[0015] It prevents the gas collecting box from sliding relative to the lower cup seat, has good stability, and makes the gas collecting box and the lower cup seat tightly combined, preventing spot welding from affecting the combination accuracy.

[0016] Furthermore, there are multiple positioning holes, each of which is coaxial with an air collecting hole at the bottom of the lower cup holder; in step B, a positioning pin is inserted into each positioning hole, and the upper end of each positioning pin protrudes from the bottom wall of the lower cup holder.

[0017] When the lower cup holder is combined with the gas collecting box at the same time, it is convenient to complete the combined spot welding of multiple gas collecting boxes at one time, thereby improving the spot welding efficiency.

[0018] Furthermore, a plurality of first positioning blocks are respectively provided on both sides of the lower cup holder, and a second positioning block is provided at both ends of the lower cup holder. The first positioning block and the second positioning block are both fixed on the tooling base, and one side of the first positioning block and one side of the second positioning block are both in contact with the edge of the lower cup holder.

[0019] It is convenient to position the lower cup seat on the tooling base before installing the positioning pin, thereby ensuring the position accuracy of the lower cup seat and improving the combined spot welding accuracy.

[0020] Furthermore, the first positioning block and the second positioning block are respectively provided with long bolt holes, and the first positioning block and the second positioning block are respectively fixed to the tooling base by bolts passing through the long bolt holes; when the bolts are loosened, the first positioning block and the second positioning block can respectively approach or move away from the lower cup holder along the length direction of their own long bolt holes.

[0021] The position of the positioning block can be adjusted through the long bolt hole to adapt to the sizes of different lower cup holders, which can reduce the amount of tooling base, save materials, and reduce assembly costs.

[0022] Furthermore, positioning seats are respectively provided on both sides of the lower cup seat, the positioning seats are fixed on the tooling base, the positioning seats are spaced apart from the lower cup seat, a plurality of notches are provided on the positioning seats, the first positioning block is located in the notch, and both sides of the first positioning block are respectively in contact with the two side walls of the notch.

[0023] The first positioning block is prevented from rotating, and the first positioning block is ensured to be in surface contact with the lower cup seat, thereby reducing stress, preventing deformation of the lower cup seat, and having good stability.

[0024] Furthermore, a rectangular mounting base is provided on the lower side of the tooling base, and mounting holes are provided at the four corners of the mounting base.

[0025] By passing bolts through the mounting holes, the mounting base plate can be fixed on the workbench of the four-axis welding robot, which facilitates automatic spot welding and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the tooling base of the present invention.

[0027] Figure 2 It is a schematic diagram of the assembly process of the lower cup holder and the gas collecting box.

[0028] Figure 3 It is a schematic diagram of the combination relationship between the positioning pin and the gas collecting box.

[0029] In the accompanying drawings, the technical features represented by the reference numerals are as follows: 1-lower cup holder; 2-gas collecting box; 21-outer flange; 3-tooling base; 4-locating pin; 5-locating hole; 6-first positioning block; 7-second positioning block; 8-long bolt hole; 9-locating seat; 10-mounting base plate; 11-mounting hole. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The present invention refers to Figure 1-3 .

[0032] The present invention provides a method for spot welding a lower cup seat and a gas collecting box of a blade, comprising the following steps: A. Position the lower cup holder 1 on the tooling base 3; The upper end of the tooling base 3 is provided with an assembly surface, which is in contact with the lower side of the lower cup holder 1. A positioning hole 5 is provided on the assembly surface, and the original air collecting hole at the bottom of the lower cup holder 1 is directly opposite to the positioning hole 5. B. Insert the positioning pin 4 into the positioning hole 5, and the upper end of the positioning pin 4 protrudes from the bottom wall of the lower cup holder 1; C. Cover the gas collecting box 2 on the positioning pin 4, so that the opening of the gas collecting box 2 contacts the bottom wall of the lower cup holder 1; D. Spot welding is performed around the opening of the gas collecting box 2 to fix the gas collecting box 2 on the lower cup holder 1; E. Take out the lower cup holder 1 from the tooling base 3, pull out the positioning pin 4 from the bottom of the lower cup holder 1, and complete the combined spot welding.

[0033] Note: When there are multiple gas collecting boxes 2 (usually 3), repeat the above steps multiple times to complete the spot welding of multiple gas collecting boxes 2. It is also possible to use multiple positioning pins 4 and set multiple positioning holes 5. After the multiple gas collecting boxes 2 are combined in one lower cup holder 1 in step BC, the spot welding is performed in step D to complete the spot welding of multiple gas collecting boxes 2 at one time.

[0034] By adopting the present invention, the lower cup holder 1 is positioned by the tooling base 3 and the positioning pin 4, and the positioning pin 4 positions the gas collecting box 2 on the lower cup holder 1, thereby avoiding displacement of the gas collecting box 2 relative to the lower cup holder 1 during spot welding, and the position stability of the lower cup holder 1 is good, thereby achieving a tight combination of the gas collecting box 2 and the lower cup holder 1 with high combination accuracy; in addition, the positioning pin 4 provides support for the inner wall of the gas collecting box 2, thereby improving the pressure resistance of the gas collecting box 2 and avoiding deformation of the gas collecting box 2; and improving the product yield rate.

[0035] Further, such as Figure 3 As shown: there is a gap between the upper end of the positioning pin 4 and the bottom wall of the gas collecting box 2.

[0036] Avoid interference between the upper end of the positioning pin 4 and the gas collecting box 2, ensuring that the opening of the gas collecting box 2 can contact the bottom wall of the lower cup holder 1; at the same time, avoid spot welding stress that causes the gas collecting box 2 to excessively hold the positioning pin 4, ensuring that the positioning pin 4 can be smoothly removed after spot welding, and avoiding plastic deformation of the gas collecting box 2 during the process of pulling out the positioning pin 4.

[0037] Furthermore, an outer flange 21 is provided at the opening of the gas collecting box 2 , and the outer flange 21 is attached to the bottom wall of the lower cup holder 1 .

[0038] The design of the outer flange 21 can increase the distance between the welding point and the positioning pin 4, avoid the arc molten iron from adhering to the positioning pin 4, reduce the removal resistance of the positioning pin 4, and avoid tearing damage to the gas collecting box 2 and the lower cup holder 1 during the removal process of the positioning pin 4.

[0039] Furthermore, the diameter of the positioning hole 5 , the diameter of the positioning pin 4 , and the diameter of the original air collecting hole at the bottom of the lower cup holder 1 are all equal.

[0040] This facilitates ensuring that the positioning pin 4 can position the lower cup holder 1 on the tooling base 3 , thereby preventing the lower cup holder 1 from sliding relative to the tooling base 3 and improving assembly accuracy.

[0041] Furthermore, the diameter of the upper end of the positioning pin 4 is equal to the inner diameter of the gas collecting box 2 .

[0042] The gas collecting box 2 is prevented from sliding relative to the lower cup holder 1, and the stability is good, so that the gas collecting box 2 and the lower cup holder 1 are tightly combined, and the spot welding is prevented from affecting the combination accuracy.

[0043] Further, such as Figure 1-2 As shown: there are multiple positioning holes 5, each positioning hole 5 is coaxial with an air collecting hole at the bottom of the lower cup holder 1; In step B, a positioning pin 4 is inserted into each positioning hole 5 , and the upper end of each positioning pin 4 protrudes from the bottom wall of the lower cup holder 1 .

[0044] When the lower cup holder 1 is combined with the gas collecting box 2 at the same time, it is convenient to complete the combined spot welding of multiple gas collecting boxes 2 at one time, thereby improving the spot welding efficiency.

[0045] Furthermore, a plurality of first positioning blocks 6 are respectively provided on both sides of the lower cup holder 1, and second positioning blocks 7 are provided at both ends of the lower cup holder 1. The first positioning blocks 6 and the second positioning blocks 7 are both fixed on the tooling base 3, and one side of the first positioning block 6 and one side of the second positioning block 7 are both in contact with the edge of the lower cup holder 1.

[0046] It is convenient to position the lower cup holder 1 on the tooling base 3 before installing the positioning pin 4, thereby ensuring the position accuracy of the lower cup holder 1 and improving the combined spot welding accuracy.

[0047] Furthermore, a long bolt hole 8 is respectively provided on the first positioning block 6 and the second positioning block 7, and the first positioning block 6 and the second positioning block 7 are respectively fixed to the tooling base 3 by bolts passing through the long bolt holes 8; when the bolts are loosened, the first positioning block 6 and the second positioning block 7 can respectively approach or move away from the lower cup holder 1 along the length direction of their own long bolt holes 8.

[0048] The position of the positioning block can be adjusted through the long bolt hole 8 to adapt to different sizes of the lower cup holder 1, which can reduce the amount of tooling base 3, save materials, and reduce assembly costs.

[0049] Furthermore, positioning seats 9 are respectively provided on both sides of the lower cup seat 1, and the positioning seats 9 are fixed on the tooling base 3. The positioning seats 9 are spaced apart from the lower cup seat 1, and a plurality of notches are provided on the positioning seats 9. The first positioning block 6 is located in the notch, and both sides of the first positioning block 6 are respectively in contact with the two side walls of the notch.

[0050] The first positioning block 6 is prevented from rotating, and the first positioning block 6 is ensured to be in surface contact with the lower cup holder 1 , thereby reducing stress, preventing the lower cup holder 1 from deforming, and providing good stability.

[0051] Furthermore, a rectangular mounting base plate 10 is provided on the lower side of the tooling base 3 , and mounting holes 11 are provided at the four corners of the mounting base plate 10 .

[0052] By passing bolts through the mounting holes 11 , the mounting base plate 10 can be fixed on the workbench of the four-axis welding robot, which facilitates automatic spot welding and improves work efficiency.

[0053] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, if the terms describing the relative functional relationship of structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0056] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be interpreted in a restrictive manner. For example, "on" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0057] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the present invention.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by a person skilled in the art within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents are still within the scope of protection of the present application.

Claims

1. A method for spot welding a lower cup seat of a blade and a gas collecting box, characterized in that: The following steps are involved: A. Position the lower cup holder (1) on the tooling base (3); The upper end of the tooling base (3) is provided with an assembly surface, the assembly surface is in contact with the lower side of the lower cup holder (1), a positioning hole (5) is provided on the assembly surface, and the original air collecting hole at the bottom of the lower cup holder (1) is directly opposite to the positioning hole (5); B. Insert the positioning pin (4) into the positioning hole (5), with the upper end of the positioning pin (4) protruding from the bottom wall of the lower cup holder (1); C. Cover the gas collecting box (2) on the positioning pin (4), so that the opening of the gas collecting box (2) contacts the bottom wall of the lower cup holder (1); D. Spot welding is performed around the opening of the gas collecting box (2) to fix the gas collecting box (2) on the lower cup holder (1); E. Remove the lower cup holder (1) from the tooling base (3), pull out the positioning pin (4) from the bottom of the lower cup holder (1), and complete the combined spot welding.

2. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 1 is characterized in that: There is a gap between the upper end of the positioning pin (4) and the bottom wall of the gas collecting box (2).

3. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 2 is characterized in that: An outer flange (21) is provided at the opening of the gas collecting box (2), and the outer flange (21) is fitted on the bottom wall of the lower cup holder (1).

4. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 1, characterized in that: The diameter of the positioning hole (5), the diameter of the positioning pin (4) and the diameter of the original air collecting hole at the bottom of the lower cup holder (1) are all equal.

5. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 4, characterized in that: The diameter of the upper end of the positioning pin (4) is equal to the inner diameter of the gas collecting box (2).

6. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 1, characterized in that: There are a plurality of positioning holes (5), and each positioning hole (5) is coaxial with an air collecting hole at the bottom of the lower cup seat (1); In step B, a positioning pin (4) is inserted into each positioning hole (5), and the upper end of each positioning pin (4) protrudes from the bottom wall of the lower cup holder (1).

7. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 1, characterized in that: A plurality of first positioning blocks (6) are respectively provided on both sides of the lower cup holder (1), and second positioning blocks (7) are provided at both ends of the lower cup holder (1). The first positioning blocks (6) and the second positioning blocks (7) are both fixed on the tooling base (3), and one side of the first positioning block (6) and one side of the second positioning block (7) are both in contact with the edge of the lower cup holder (1).

8. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 7, characterized in that: The first positioning block (6) and the second positioning block (7) are respectively provided with long bolt holes (8), and the first positioning block (6) and the second positioning block (7) are respectively fixed to the tooling base (3) by bolts passing through the long bolt holes (8); when the bolts are loosened, the first positioning block (6) and the second positioning block (7) can respectively move closer to or farther away from the lower cup holder (1) along the length direction of their own long bolt holes (8).

9. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 8, characterized in that: Positioning seats (9) are also provided on both sides of the lower cup seat (1), the positioning seats (9) are fixed on the tooling base (3), the positioning seats (9) are spaced apart from the lower cup seat (1), a plurality of notches are provided on the positioning seats (9), the first positioning block (6) is located in the notch, and the two sides of the first positioning block (6) are in contact with the two side walls of the notch respectively.

10. The method for spot welding the lower cup seat and the gas collecting box of the blade according to claim 1, characterized in that: A rectangular mounting base plate (10) is also provided on the lower side of the tooling base (3), and mounting holes (11) are also provided at the four corners of the mounting base plate (10).

Images