Sheet metal part, welding assembly, household appliance and stamping device

Abstract

The utility model relates to the technical field of resistance welding, in particular to a sheet metal part, a welding assembly, a household appliance and a stamping device. The boss is connected to the plate body and comprises a transition section and a connection section, the transition section surrounds the connection section, one end of the transition section is connected to the plate body, and the connection section is connected to the other end of the transition section. On the section which is perpendicular to the plate body and passes through the center of the boss, the distance between the two side walls of the transition section is gradually decreased in the direction away from the plate body, and the included angle between the two side walls is an obtuse angle. The included angle formed by the two side faces of the transition section is an obtuse angle. The obtuse angle is formed in the punch forming process of the boss, so that stress concentration at the boss can be reduced, and the situation that the sheet metal part is cracked by tension is reduced. Under the condition that the protruding height of the boss is fixed, the taper angle formed by the stamping face at the corresponding position of the boss is large, the size of a melting core between welding pieces is large, the large connection strength can be improved, and the phenomenon that pseudo soldering is formed between the welding pieces is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resistance welding, and particularly relates to a sheet metal part, a welding assembly, a household appliance and a stamping device. BACKGROUND

[0002] Resistance welding is a kind of welding method with resistance heat as energy, including electroslag welding with slag resistance heat as energy and resistance welding with solid resistance heat as energy. Resistance welding is generally a welding method for realizing connection by melting the contact surface between two workpieces under the action of a certain electrode pressure and using the resistance heat generated when the current passes through the workpieces. Among them, projection welding is a commonly used welding method in resistance welding. Before projection welding, one or more bosses need to be processed at the welding position.

[0003] In the related art, the shape of the processed boss is unstable, which may affect the welding quality. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the embodiments of the present application aim to provide a sheet metal part, a welding assembly, a household appliance and a stamping device to reduce the instability of the shape of the processed boss, thereby improving the welding quality.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application provide a sheet metal part for resistance welding, which comprises a plate body and a boss formed by stamping, the boss is connected to the plate body, the boss comprises a transition section and a connecting section, the transition section surrounds the connecting section, one end of the transition section is connected to the plate body, and the connecting section is connected to the other end of the transition section.

[0006] In the cross section perpendicular to the plate body and passing through the center of the boss, the distance between the two side walls of the transition section decreases in the direction away from the plate body, and the included angle of the two side walls is obtuse.

[0007] The welding assembly according to the embodiments of the present application has at least the following beneficial effects:

[0008] In the scheme of the embodiments of the present application, the sheet metal part comprises a plate body and a boss formed by stamping, and the boss comprises a transition section and a connecting section, wherein the included angle of the two side faces of the transition section is obtuse. The formation of the obtuse angle in the process of stamping the boss can reduce the stress concentration of the stress at the boss, thereby reducing the situation of the sheet metal part being cracked to a certain extent. Furthermore, the taper angle formed by the transition section is obtuse. In the case that the protruding height of the boss is constant, the taper angle formed by the position of the boss is larger, and in the process of resistance welding, the boss will be melted to form a molten core, the volume of the molten core between the welded parts is larger, which can improve the larger connection strength and reduce the situation of false welding between the welded parts.

[0009] According to some embodiments of the present application, the included angle of the two side walls of the transition section ranges from 95° to 105°.

[0010] According to some embodiments of the present application, the thickness of the plate body is D2, the boss has a welding surface and a stamping surface, the boss protrudes along the stamping surface towards the welding surface, and the welding surface protrudes away from the stamping surface by a distance D4.

[0011] D2+0.10mm≤D3≤D2+0.15mm.

[0012] According to some embodiments of the present application, the projection area of the boss along the thickness direction of the sheet metal part is circular, and the diameter of the boss ranges from 2mm to 3mm.

[0013] According to some embodiments of the present application, the thickness of the plate body is D2, the boss has a welding surface and a stamping surface, the boss protrudes along the stamping surface towards the welding surface, and the stamping surface protrudes towards the welding surface by a distance D3 along the thickness direction of the sheet metal part.

[0014] D2+0.10mm≤D3≤D2+0.15mm.

[0015] The embodiments of the present application also provide a welding assembly, comprising:

[0016] The sheet metal part of any one of the above;

[0017] A welding plate capable of abutting against the boss to be welded and connected with the sheet metal part.

[0018] The embodiments of the present application also provide a household appliance, comprising:

[0019] A main body;

[0020] The welding assembly of any one of the above, mounted on the main body;

[0021] The embodiments of the present application also provide a stamping device, comprising:

[0022] A driving member;

[0023] A stamping member for stamping a sheet metal part to form a boss on the sheet metal part, and the driving member is configured to drive the stamping member to move to stamp the sheet metal part;

[0024] The stamping member has a frustum shape, and the cross-sectional area of the stamping member gradually increases along the direction of the stamping member towards the driving member.

[0025] According to some embodiments of the present application, the taper angle of the stamping member is obtuse.

[0026] According to some embodiments of the present application, the diameter of the surface of the end of the stamping away from the driving member ranges from 0.5mm to 0.6mm.

[0027] Additional aspects and advantages of the present application will become apparent in the description that follows, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A schematic diagram of a structure of a sheet metal part according to an embodiment of the present application;

[0029] Figure 2 A schematic diagram of a structure of a stamping device according to an embodiment of the present application;

[0030] Figure 3 A schematic diagram of a structure of a sheet metal part and a welding plate according to an embodiment of the present application.

[0031] LIST OF REFERENCE NUMERALS

[0032] 100, sheet metal part; 100a, boss; 100b, stamping surface; 100c, welding surface; 100d, transition section; 100e, connecting section; 100f, plate body; 200, stamping device; 210, driving member; 220, stamping member; 300, welding plate. DETAILED DESCRIPTION

[0033] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0036] Reference to an “embodiment” in this text means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily exclude other embodiments from the application. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0037] In the description of the embodiments of the application, the term “and / or” is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character “ / ” in this text generally represents that the front and rear associated objects are “or” relationship.

[0038] In the description of the embodiments of the application, the technical terms “top”, “bottom”, “upper”, “lower” and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0039] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms “mounting”, “connection”, “connection”, “fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0040] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical term “contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0041] In the related art, a stamping part of a stamping device is used to stamp a sheet metal part, so as to process a boss for welding connection. The shape of the stamping part is usually spherical, the contact area between the stamping part and the sheet metal part is small, after the stamping is completed, the taper angle of the boss formed by the sheet metal part is an acute angle, the stress at the top of the boss during the stamping process is relatively concentrated, and the sheet metal part may be torn.

[0042] The taper angle of the boss 100a formed by the sheet metal part 100 is obtuse, and the stress at the vertex is small, so that the sheet metal part 100 is less likely to be pulled apart.

[0043] The present application provides a household appliance, which comprises a main body and a welding assembly.

[0044] It can be understood that the welding assembly can constitute an outer shell or an internal structure of the household appliance.

[0045] Exemplarily, the household appliance can be a microwave oven, an oven or other cooking appliances.

[0046] The present application provides a welding assembly, which comprises a sheet metal part 100 and a welding plate 300, and the welding plate 300 can abut against the boss 100a to be welded and connected with the sheet metal part 100.

[0047] It can be understood that the sheet metal part 100 and the welding plate 300 can be resistance-welded by a welding device. During the welding process, the welding device can supply current to the sheet metal part 100 and the welding plate 300, and the welding device can drive the sheet metal part 100 and the welding plate 300 to approach each other when both the sheet metal part 100 and the welding plate 300 are in the state of being supplied with current, so as to weld and connect the sheet metal part 100 and the welding plate 300.

[0048] It can be understood that when the sheet metal part 100 is supplied with current, the current can be concentrated on the boss 100a due to the boss 100a formed by stamping the sheet metal part 100. During the welding process, the welding device drives the sheet metal part 100 and the welding plate 300 to approach each other, and the current on the boss 100a is large, so that a large amount of heat is generated, and the metal at the position of the boss 100a is melted. By pressing the sheet metal part 100 and the welding plate 300 against each other, the metal at the position of the boss 100a is filled between the sheet metal part 100 and the welding plate 300 and fixedly connected with the welding plate 300, so as to realize the welding connection between the sheet metal part 100 and the welding plate 300.

[0049] In an embodiment, the number of the protrusions 100a is multiple, and the multiple protrusions 100a are arranged at intervals. The multiple protrusions 100a can increase the connection strength between the sheet metal part 100 and the welding plate 300 to some extent, thereby reducing the situation that the sheet metal part 100 and the welding plate 300 are separated from each other during work. The present application provides a stamping device 200, which comprises a driving member 210 and a stamping member 220. The stamping member 220 is used to stamp the sheet metal part 100 to form the protrusions 100a. The driving member 210 is used to drive the stamping member 220 to move to stamp the sheet metal part 100. The shape of the stamping member 220 is a circular truncated cone. The cross-sectional area of the stamping member 220 gradually increases along the direction of the driving member 210.

[0050] The stamping device 200 refers to a device used to stamp the sheet metal part 100 to cause plastic deformation of the sheet metal part 100 to form the protrusions 100a.

[0051] Exemplarily, the height direction of the stamping member 220 is arranged along the arrangement direction of the driving member 210 and the stamping member 220. The cross section of the stamping member 220 is circular.

[0052] In the scheme of the embodiment of the present application, the stamping member 220 of the stamping device 200 is used to stamp the sheet metal part 100 to form the protrusions 100a for welding connection. The shape of the stamping member 220 is a circular truncated cone. The cross-sectional area of the circular truncated cone gradually increases along the direction towards the driving member 210. During stamping, the stamping member 220 stamps the sheet metal part 100 through the circular plane. The contact area between the stamping member 220 and the sheet metal part 100 is large, thereby reducing the degree of springback of the sheet metal part 100 after stamping. In addition, the contact area between the stamping member 220 and the sheet metal part 100 is large, thereby reducing the situation that the sheet metal part 100 is pulled apart due to a large pressure.

[0053] In an embodiment, referring to Figure 2 , the taper angle of the stamping member 220 is obtuse.

[0054] Exemplarily, the projection area of the stamping member 220 is isosceles trapezoidal along the width direction of the stamping member 220. The included angle formed by the extensions of the two sides of the stamping member 220 is obtuse.

[0055] Exemplarily, the taper angle of the stamping member 220 is shown as an angle θ1 in Figure 2 .

[0056] In the scheme of the embodiment of the application, the taper angle of the stamping piece 220 is obtuse. In the process of stamping the sheet metal piece 100 by the stamping piece 220, part of the structure of the sheet metal piece 100 will be plastically deformed under the action of external force, and the larger the taper angle of the stamping piece 220 is, the larger the radius of the boss 100a will be. In the process of resistance welding, the boss 100a will be melted to form a molten core, and the volume of the molten core between the welded pieces is larger, which can improve the connection strength and reduce the case of forming a false weld between the welded pieces.

[0057] It can be understood that the embodiment of the application is not limited to the case that the taper angle of the stamping piece 220 is obtuse. For example, the taper angle of the stamping piece 220 is a right angle or an acute angle.

[0058] In an embodiment, referring to Figure 2 , the range of the taper angle of the stamping piece 220 is 95°-105°.

[0059] For example, the taper angle of the stamping piece 220 is 95°, 97°, 100°, 102° or 105°.

[0060] It can be understood that the taper angle of the stamping piece 220 can be measured by a protractor under normal temperature and pressure.

[0061] In the scheme of the embodiment of the application, the taper angle of the stamping piece 220 in the appropriate range can take into account the case that the radius of the boss 100a formed is larger and the sheet metal piece 100 is less likely to be broken by the stamping piece 220 in the process of stamping.

[0062] It can be understood that the embodiment of the application does not limit the size of the taper angle of the stamping piece 220.

[0063] In an embodiment, referring to Figure 2 , the diameter of the surface of the end of the stamping piece 220 away from the driving piece 210 is 0.5mm-0.6mm.

[0064] For example, the diameter of the surface of the end of the stamping piece 220 away from the driving piece 210 is 0.50mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm or 0.60mm.

[0065] It can be understood that the diameter of the surface of the end of the stamping piece 220 away from the driving piece 210 can be measured by a vernier caliper under normal temperature and pressure.

[0066] It can be understood that in the process of stamping the sheet metal piece 100 by the stamping piece 220, the surface of the end of the stamping piece 220 away from the driving piece 210 abuts against the sheet metal piece 100, so that the sheet metal piece 100 is plastically deformed.

[0067] Exemplarily, the diameter of the surface of the one end of the stamping piece 220 away from the driving piece 210 is as shown by the middle size D1. Figure 2

[0068] In the scheme of the embodiment of the present application, the diameter of the surface of the one end of the stamping piece 220 away from the driving piece 210 is suitable to make the volume of the boss 100a in a suitable range. The diameter of the boss 100a is more suitable to make the connection strength between the welded pieces higher and the deformation of the sheet metal piece 100 smaller, reducing the situation that the sheet metal piece 100 is broken by the stamping piece 220.

[0069] It can be understood that the embodiment of the present application does not limit the size of the diameter of the surface of the one end of the stamping piece 220 away from the driving piece 210.

[0070] The present application provides a sheet metal piece 100, please refer to Figure 1 and Figure 2 The sheet metal piece 100 includes a plate body 100f and a boss 100a formed by stamping, the boss 100a is connected to the plate body 100f, the boss 100a includes a transition section 100d and a connecting section 100e, the transition section 100d surrounds the connecting section 100e, and one end of the transition section 100d is connected to the plate body 100f, and the connecting section 100e is connected to the other end of the transition section 100d.

[0071] In the cross section perpendicular to the plate body 100f and passing through the center of the boss 100a, the distance between the two side walls of the transition section 100d decreases in the direction away from the plate body 100f, and the included angle of the two side walls is obtuse.

[0072] Exemplarily, the shape of the boss 100a is a central symmetric figure, and along the width direction of the sheet metal piece 100, the projection area of the transition section 100d forms two inclined sections on both sides of the projection area of the connecting section 100e. The two inclined sections intersect to form the included angle of the two side walls.

[0073] Resistance welding refers to a welding method which uses the resistance heat generated by the current passing through the welding pieces and the contact as the heat source to locally heat the welding pieces to the molten or plastic state, and at the same time, to apply pressure for welding.

[0074] ​In the scheme of the embodiment of the application, the sheet metal part 100 includes a plate body 100f and a boss 100a formed by stamping, the boss 100a includes a transition section 100d and a connecting section 100e, and the two side surfaces of the transition section 100d form an obtuse angle. Forming the obtuse angle in the process of stamping the boss 100a can reduce stress concentration of stress at the boss 100a, thereby reducing the case of being pulled apart of the sheet metal part 100 to a certain extent. In addition, the taper angle of the transition section 100d is obtuse. In the case that the protruding height of the boss 100a is constant, the taper angle formed by the position of the boss 100a is larger, and in the process of resistance welding, the boss 100a will melt to form a melting core, and the volume of the melting core between the welded parts is larger, which can improve the larger connection strength and reduce the case of forming a false weld between the welded parts.

[0075] In an embodiment, referring to Figure 1 , the angle between the two side walls of the transition section 100d ranges from 95° to 105°.

[0076] Exemplarily, the angle between the two side walls of the transition section 100d is shown as Figure 1 an angle θ2.

[0077] Exemplarily, the angle between the two side walls of the transition section 100d is 95°, 97°, 100°, 102° or 105°.

[0078] It can be understood that the angle between the two side walls of the transition section 100d can be measured by a protractor under normal temperature and pressure.

[0079] In the scheme of the embodiment of the application, the angle between the two side walls of the transition section 100d in the appropriate range can take into account that the radius of the boss 100a formed is larger and reduce the case of the sheet metal part 100 being broken due to a larger strain of the sheet metal part 100.

[0080] It can be understood that the embodiment of the application does not limit the size of the angle between the two side walls of the transition section 100d.

[0081] In an embodiment, referring to Figure 1 and Figure 3 , the thickness of the plate body 100f is D2, the boss 100a has a welding surface 100c and a stamping surface 100b, the boss 100a protrudes along the direction of the stamping surface 100b towards the welding surface 100c, and the distance of the stamping surface 100b protruding towards the welding surface 100c along the thickness direction of the sheet metal part 100 is D3. Wherein, D2+0.10mm≤D3≤D2+0.15mm.

[0082] The stamping surface 100b refers to the surface of the sheet metal part 100 facing the stamping part 220 during the stamping process of the stamping part 220. The stamping part 220 directly abuts against the stamping surface 100b to apply pressure to the stamping surface 100b, thereby causing the sheet metal part 100 to undergo plastic deformation.

[0083] It is understandable that the tapered angle formed by the stamped surface 100b at the corresponding position of the boss 100a can be formed by stamping the stamping part 220 in one go. Alternatively, it can be formed by stamping the stamping part 220 multiple times or by arranging multiple stamping parts 220 side-by-side. For example, the end of the stamping part 220 facing away from the drive member 210 can be an acute angle. By adjusting the relative position between the stamping part 220 and the sheet metal part 100 and stamping multiple times, the tapered angle of the stamped surface 100b at the corresponding position of the boss 100a can be made to form an obtuse angle.

[0084] For example, the thickness of the plate 100f is as follows: Figure 1 As shown in the intermediate dimension D2, the distance by which the stamped surface 100b protrudes towards the welding surface 100c along the thickness direction of the sheet metal part 100 is as follows: Figure 1 As shown in the medium dimension D3.

[0085] For example, the thickness direction of the sheet metal part 100 is as follows: Figure 1 The direction indicated by the middle arrow R1.

[0086] For example, the thickness of the sheet metal 100f is 0.5mm, and the distance by which the stamping surface 100b protrudes along the thickness direction of the sheet metal part 100 is greater than or equal to 0.5mm and less than or equal to 0.65mm.

[0087] For example, the distance by which the connecting segment 100e protrudes along the thickness direction of the sheet metal part 100 is 0.5mm, 0.55mm, 0.60mm or 0.65mm.

[0088] Understandably, the distance by which the stamped surface 100b protrudes along the thickness direction of the sheet metal part 100 can be measured by vernier calipers under normal temperature and pressure conditions.

[0089] For example, the thickness direction of the sheet metal part 100 is arranged along the arrangement direction of the stamping part 220 and the driving part 210.

[0090] It is understandable that the two sides of the transition section 100d are located within the stamping surface 100b.

[0091] In the embodiment of this application, the distance of the square protrusion of the stamping surface 100b along the thickness of the sheet metal part 100 is within a suitable range, which can ensure that the welding between two adjacent welded parts is relatively full, the connection strength is high, and the strain generated by the sheet metal part 100 is less than the fracture strain of the sheet metal part 100 material, thus reducing the possibility of the sheet metal part 100 breaking.

[0092] It can be understood that the embodiments of the present application do not limit the relationship between the distance of the stamping surface 100b protruding towards the welding surface 100c along the thickness direction of the sheet metal part 100 and the thickness of the plate body 100f.

[0093] In an embodiment, referring to Figure 1 , the thickness of the plate body 100f is D2, the boss 100a has a welding surface 100c and a stamping surface 100b, the boss 100a protrudes along the direction of the stamping surface 100b towards the welding surface 100c, and the welding surface 100c protrudes on the side away from the stamping surface 100b by a distance D4 at the corresponding position of the boss 100a. Among them, D2≤D4≤D2+0.05mm.

[0094] Exemplarily, the distance of the welding surface 100c protruding on the side away from the stamping surface 100b at the corresponding position of the boss 100a is shown as the size D4 in Figure 1 .

[0095] Exemplarily, the thickness of the plate body 100f is 0.5mm, and the distance of the welding surface 100c protruding on the side away from the stamping surface 100b at the corresponding position of the boss 100a is 0.50mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm or 0.55mm.

[0096] It can be understood that the distance of the welding surface 100c protruding on the side away from the stamping surface 100b at the corresponding position of the boss 100a can be obtained by measuring with a vernier caliper under normal temperature and pressure.

[0097] In the scheme of the embodiments of the present application, the distance of the welding surface 100c protruding on the side away from the stamping surface 100b at the corresponding position of the boss 100a within the appropriate range can take into account that the welding between the two adjacent welded parts is relatively full, the connection strength is relatively high, and the strain generated by the sheet metal part 100 is less than the fracture strain of the material of the sheet metal part 100, which can reduce the fracture of the sheet metal part 100.

[0098] It can be understood that the embodiments of the present application do not limit the size of the distance of the boss 100a protruding on the side away from the stamping surface 100b at the corresponding position.

[0099] In an embodiment, referring to Figure 1 , the projection area of the boss 100a is circular along the thickness direction of the sheet metal part 100, and the diameter of the boss 100a ranges from 2mm to 3mm.

[0100] Exemplarily, the diameter of the boss 100a is shown as the size D5 in Figure 1 .

[0101] Exemplarily, the diameter of the boss 100a is 2.0 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3.0 mm in the thickness direction of the sheet metal part 100.

[0102] It can be understood that the diameter of the boss 100a can be measured by a vernier caliper at normal temperature and pressure.

[0103] In the scheme of the embodiments of the present application, the projection area of the boss 100a is circular, so that the molten core formed during the welding process of the sheet metal part 100 is relatively full, and the connection strength is relatively high. Furthermore, the diameter of the boss 100a in the appropriate range can take into account the connection strength and the degree of deformation of the sheet metal part 100.

[0104] It can be understood that the embodiments of the present application do not limit the diameter of the boss 100a in the thickness direction of the sheet metal part 100.

[0105] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of protection.

Claims

1. A sheet metal part, characterized in that, The sheet metal part for resistance welding comprises a plate body and a boss formed by stamping, the boss is connected to the plate body, the boss comprises a transition section and a connecting section, the transition section surrounds the connecting section, one end of the transition section is connected to the plate body, and the connecting section is connected to the other end of the transition section. In a cross section perpendicular to the plate body and passing through the center of the boss, the distance between the two side walls of the transition section decreases in the direction away from the plate body, and the included angle between the two side walls is obtuse.

2. The sheet metal part of claim 1, wherein, The included angle between the two side walls of the transition section ranges from 95° to 105°.

3. The sheet metal part according to claim 1 or 2, characterized in that The thickness of the plate body is D2, the boss has a welding surface and a stamping surface, the boss protrudes in the direction from the stamping surface to the welding surface, and the distance by which the welding surface protrudes on the side away from the stamping surface at the corresponding position of the boss is D4. D2≤D4≤D2+0.05mm.

4. The sheet metal part according to claim 1 or 2, characterized in that In the thickness direction of the sheet metal part, the projection area of the boss is circular, and the diameter of the boss ranges from 2mm to 3mm.

5. The sheet metal part of claim 1 or 2, wherein, The thickness of the plate body is D2, the boss has a welding surface and a stamping surface, the boss protrudes in the direction from the stamping surface to the welding surface, and the distance by which the stamping surface protrudes in the thickness direction of the sheet metal part towards the welding surface is D3. D2+0.10mm≤D3≤D2+0.15mm.

6. A welding assembly characterized by, The sheet metal part comprises: The sheet metal part according to any one of claims 1 to 5; A welding plate capable of abutting against the boss to be welded and connected with the sheet metal part.

7. A domestic appliance characterized in that, The welding assembly comprises: A main body; The welding assembly according to claim 6 is installed on the main body.

8. A stamping apparatus characterized by comprising: The welding assembly comprises: A driving member; A stamping member for stamping a sheet metal part to form a boss on the sheet metal part, the driving member is used to drive the stamping member to move to stamp the sheet metal part; The stamping member is in the shape of a circular truncated cone, and the cross-sectional area of the stamping member gradually increases in the direction from the stamping member to the driving member.

9. The stamping apparatus of claim 8, wherein, The taper angle of the stamping member is obtuse.

10. The stamping apparatus of claim 8, wherein, The diameter of the surface of one end of the stamping member away from the driving member ranges from 0.5mm to 0.6mm.

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