Welding device and method for aluminum rim production

Abstract

The invention discloses a welding device and method for aluminum rim production, and particularly relates to the technical field of welding machining.The device comprises a machine base, a clamping assembly is arranged on the machine base, an auxiliary supporting plate is arranged at the position, corresponding to the bottom of a rim workpiece, of the machine base, and a local cooling assembly is arranged on the auxiliary supporting plate; the local cooling assembly is used for cooling the position, away from the welding area, of the rim workpiece, heat absorption type heat conduction blocking assemblies are arranged in the lower clamp and the upper clamp correspondingly, and the heat absorption type heat conduction blocking assemblies are used for absorbing heat on the surface of the rim workpiece. According to the welding device, spreading of welding heat to other areas of the rim workpiece can be reduced, meanwhile, local cooling is conducted on the rim workpiece, air expansion in an inner-layer closed space of the welding area of the rim workpiece is compensated, then the machining quality of the double-layer thin-wall rim workpiece is improved, the follow-up shaping work amount is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding processing, and more specifically, to a welding device and method for producing aluminum wheel rims. Background Art

[0002] Bicycle rims (also called wheel rims) are an important part of bicycle wheels. They not only support tires and inner tubes, but also form a complete wheel system together with spokes, hubs and other components. Among them, aluminum alloy rims (also called aluminum rims) have become one of the most widely used rim materials in the bicycle industry due to their light weight, high strength, corrosion resistance, easy processing, moderate cost and diverse appearance.

[0003] Rims can be divided into many types according to their design and purpose. Among them, "blade rims" and "industrial rims" are two common and clearly distinguished types of rims. The cross-section of a blade rim is usually an aerodynamically optimized shape, such as an oval, teardrop or flat shape. This design is designed to reduce wind resistance and improve aerodynamic efficiency. The sidewalls of a blade rim are usually deeper. The deeper sidewalls help better guide the airflow and further reduce wind resistance. The cross-section of an industrial rim is usually rectangular or V-shaped, which is more traditional and straight.

[0004] In the production of aluminum rims, the main process is to pre-produce aluminum alloy rods with the same cross-section as the rims, and then bend and cut the rods. Finally, welding equipment is used to weld the two ends of the bent rim blank to form a complete circular rim. The formed rims need to have spoke holes and other necessary mounting holes drilled out according to design requirements, and then they are ground and polished, and finally painted. The rims can be assembled with other components such as tires, inner tubes, hubs, etc. to form a complete bicycle wheelset.

[0005] For the welding of wheel rim blanks, the butt welding machine is mainly used for processing. First, the two ends of the wheel rim blank to be welded are fixed on the two fixtures of the butt welding machine respectively to ensure that their end faces are accurately aligned. Before starting welding, a small pressure is applied to make the two end faces contact to ensure good electrical contact. Then, a large current is passed to the end face contact part with the help of a conductive element. The large current flows through the contact point between the end faces of the workpieces for a short time, and the heat generated by the resistance is used to quickly heat the area to a state close to the melting point but not completely melted. At this time, the end face of the wheel rim is in a state of plastic deformation, the so-called "thermoplastic zone". When the end face of the workpiece reaches the appropriate temperature, a large upsetting force is immediately applied to force the two end faces to fit closely and diffuse with each other in a plastic state to form a strong metallurgical bond. The upsetting process not only promotes the direct bonding between metal atoms, but also squeezes out oxides and other impurities generated during the welding process, thereby obtaining a high-quality welded joint.

[0006] Among them, for the I-shaped rim, it has a single-layer structure as a whole, and there is no closed space during welding. Therefore, in the actual welding process, even if the welding temperature rises and causes the temperature of the surrounding air to rise, it will not affect the rim itself. For the knife rim, it has a double-layer structure. After bending and butting both ends, the inner space of the rim blank will be relatively closed (because the rim has not been rounded at this time, its own circumferential size is not accurate, and it cannot be drilled in advance to avoid low drilling accuracy). Therefore, when the welding temperature rises, the air in the closed inner space will expand. For some wide and thick rims, the internal space is large and the side wall material strength is high. Even if the air in the inner space expands, the rim itself can provide enough of pressure, and for the rim structure with a narrow rim as a whole and a thin side wall material, although it can provide effective radial support force in actual use, during welding heating, since the rim has not been heat treated, the hardness is relatively low, and during welding, the heat conduction of the thin-walled rim is faster and wider, resulting in a higher overall temperature rise of the rim and a relatively improved deformation ability. At this time, the air in the inner space expands due to the heat, which can easily squeeze the side wall of the inner space of the rim, causing irreversible slight deformation, affecting the overall accuracy of the rim, especially during the welding process, the end face of the rim is in a state close to the melting point but not completely melted, and is more susceptible to deformation due to the influence of air pressure, affecting the welding quality, increasing subsequent processing steps, and increasing production costs. Summary of the invention

[0007] The present invention provides a welding device and method for the production of aluminum rims, and aims to solve the problem that, during the actual welding process of existing butt welding equipment, the welding temperature rises, causing the air in the closed inner space to expand. For a rim structure with a thinner side wall material, it is easy to squeeze the side wall of the inner space of the rim, causing it to produce irreversible slight deformation, affecting the overall accuracy of the rim.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solutions: A welding device for aluminum rim production, comprising a machine base, a clamping assembly is arranged on the machine base, the clamping assembly comprises a first clamping assembly and a second clamping assembly, the first clamping assembly and the second clamping assembly are both composed of a lower clamp and an upper clamp, the lower clamp and the upper clamp are provided with clamping surfaces corresponding to the external shape of the rim workpiece, and the lower clamp is provided with a butt welding electrode for contacting the rim workpiece inside;

[0009] An auxiliary support plate is arranged on the machine base at a position corresponding to the bottom of the rim workpiece, and a local cooling component is arranged on the auxiliary support plate. The local cooling component is far away from the welding position of the rim workpiece, and the local cooling component is used to cool the position of the rim workpiece far away from the welding area;

[0010] Both the lower fixture and the upper fixture are provided with endothermic heat conduction barrier components, which are used to absorb heat from the surface of the rim workpiece to prevent the heat generated during welding from being conducted to other areas of the rim workpiece.

[0011] In a preferred embodiment, the local cooling component includes an air blowing structure, which is fixedly mounted on an auxiliary support plate. The air outlet of the air blowing structure is arranged corresponding to the rim workpiece. The air blowing structure is connected to a low-temperature air source supply system through an air source connecting pipe, and the low-temperature air source supply system is used to provide low-temperature gas to the air blowing structure.

[0012] In a preferred embodiment, the heat absorption heat conduction barrier component includes a heat conductive part, which is made of a heat conductive material. The heat conductive part is fixedly installed inside the lower clamp or the upper clamp and contacts the surface of the rim workpiece when the lower clamp and the upper clamp clamp the rim workpiece.

[0013] In a preferred embodiment, the heat absorption type heat conduction barrier component also includes a heat exchange type heat absorption component, and the heat exchange type heat absorption component is arranged in the lower clamp and the upper clamp. The heat exchange type heat absorption component includes a low-temperature fluid channel, and the low-temperature fluid channel is connected to a low-temperature fluid source through a pipeline. The low-temperature fluid source includes a low-temperature fluid and a delivery pump, and the delivery pump is used to deliver the low-temperature fluid to the low-temperature fluid channel.

[0014] In a preferred embodiment, the low-temperature fluid source is a low-temperature gas source, and a blowing hole is provided on the low-temperature fluid channel. The blowing hole is arranged away from the welding area of ​​the rim workpiece and toward the surface of the rim workpiece.

[0015] In a preferred embodiment, multiple groups of pressure relief components are provided on the inner side of one end of the lower clamp and the upper clamp corresponding to the welding area of ​​the rim workpiece, and the multiple groups of pressure relief components are arranged around the rim workpiece, the pressure relief components include multiple insulating pressure blocks, the lower clamp is slidably installed inside the lower clamp or the upper clamp, the end of the insulating pressure block is arranged in an arc shape, the end of the insulating pressure block contacts the surface of the rim workpiece when the lower clamp and the upper clamp clamp the rim workpiece, and the sliding direction of the insulating pressure block is arranged perpendicular to the surface of the corresponding rim workpiece, a pressure elastic member is arranged between the insulating pressure block and the lower clamp or the insulating pressure block and the upper clamp, the pressure elastic member is used to provide an elastic force for the insulating pressure block to squeeze the surface of the rim workpiece, and the elastic force of each pressure elastic member is arranged to increase successively along the direction away from the welding area of ​​the rim workpiece.

[0016] In a preferred embodiment, the clamping assembly also includes a clamping driver, the upper clamp is installed on the output end of the clamping driver, a top forging movable seat is slidably arranged on the machine base, and a top forging driver is also arranged on the machine base, and the top forging driver is used to drive the top forging movable seat to move, and the second clamping assembly is installed on the top forging movable seat, the lower clamp and the clamping driver of the first clamping assembly are both fixedly installed on the machine base, and the lower clamp and the clamping driver of the second clamping assembly are both fixedly installed on the top forging movable seat.

[0017] In a preferred embodiment, an alignment plug plate is provided on the machine base, the alignment plug plate is located in the area between the first clamping component and the second clamping component, and is set corresponding to the gap between the two end faces of the rim workpiece. The end of the alignment plug plate is set to be blade-shaped, and the alignment plug plate is telescopically slidably installed on the machine base. A plug plate moving driver for controlling the telescopic sliding of the alignment plug plate is installed in the machine base. The alignment plug plate is provided with a slot structure for adapting to the end face of the rim workpiece, and the thickness value of the alignment plug plate is greater than the distance value between the two end faces of the rim workpiece when the rim workpiece is normally stretched.

[0018] In a preferred embodiment, an auxiliary support wheel is rotatably mounted on the auxiliary support plate, the auxiliary support wheel is in rolling cooperation with the rim workpiece, and the auxiliary support wheel is an elastic wheel structure. A rim rotation drive assembly is arranged on the clamping assembly, and the rim rotation drive assembly includes a driving wheel group, which is arranged on the lower clamp, and the wheel frame of the driving wheel group is slidably mounted on the lower clamp, an elastic support member is arranged between the wheel frame of the driving wheel group and the lower clamp, and the driving wheel group is driven to rotate by a motor, and the driving wheel group is in rolling cooperation with the rim workpiece.

[0019] A welding method for producing aluminum wheel rims comprises the following steps:

[0020] Step 1: Place the wheel rim workpiece on two sets of lower fixtures;

[0021] Step 2: Control the two groups of upper clamps to move closer to the lower clamps to clamp the rim workpiece through the clamping driver, and then control the upset driver to drive the upset moving seat to move toward the first clamping assembly to make the two end faces of the rim workpiece contact;

[0022] Step 3: Passing welding current through the welding electrode to the rim workpiece, so that the welding current passes through the contact position between the two end faces of the rim workpiece, and the heat generated by the resistance is used to heat up the area;

[0023] Step 4: Start the endothermic heat conduction barrier component and the local cooling component, use the endothermic heat conduction barrier component to prevent the heat on the rim workpiece from spreading to other areas, and use the local cooling component to cool the position of the rim workpiece away from the welding area;

[0024] Step 5: When the end surface of the rim workpiece reaches the upsetting temperature, the upsetting driver drives the upsetting moving seat to continue moving to apply the upsetting force;

[0025] Step 6: After welding is completed, the upper fixture is driven to leave the rim workpiece, and the rim workpiece is driven to rotate by the driving wheel assembly, and the rim workpiece is cooled by means of the local cooling component and the heat absorption heat conduction barrier component;

[0026] Step 7: Remove the rim workpiece.

[0027] The beneficial effects of the present invention are as follows: the present invention absorbs the heat on the rim workpiece in the lower clamp and upper clamp areas by means of an endothermic heat conduction barrier component, thereby reducing the spread of welding heat to other areas of the rim workpiece, thereby reducing the expansion of air in the inner closed space of the rim workpiece; at the same time, the rim workpiece is cooled at a position away from the welding processing area by means of a local cooling component, so that the air in the inner closed space of this area of ​​the rim workpiece shrinks, thereby compensating for the expansion of air in the inner closed space of the rim workpiece in the welding area, and will not cause pressure deformation to the side wall or welding area of ​​the thin-walled rim workpiece, thereby improving the processing quality of double-layer thin-walled rim workpieces, reducing the amount of subsequent shaping work, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a longitudinal cross-sectional view of the present invention.

[0030] Figure 3 It is a schematic diagram of the end surface structure of the rim workpiece when the clamping assembly of the present invention cooperates with the rim workpiece.

[0031] Figure 4 It is a schematic diagram of the welding state of the present invention.

[0032] Figure 5 It is a schematic structural diagram of the heat-absorbing heat conduction barrier components in the lower clamp and the upper clamp of the present invention.

[0033] Figure 6 This is a state diagram of the present invention in which the front alignment insert plate of the rim workpiece is used to position the end face of the rim workpiece.

[0034] Figure 7 It is a side view of the alignment plug board of the present invention.

[0035] Figure 8 This is a structural diagram of the improved clamping assembly of the present invention.

[0036] Fig. 9 For the present invention Figure 8 A-section structure enlarged view.

[0037] Fig.10 This is a state diagram of the wheel rim workpiece rotating after welding is completed in the present invention.

[0038] Fig.11 The figure is a flow chart of the welding method of the present invention.

[0039] The reference numerals are: 1, machine base; 11, upset moving base; 111, upset driver; 12, auxiliary support plate; 121, auxiliary support wheel; 2, clamping assembly; 201, first clamping assembly; 202, second clamping assembly; 21, lower clamp; 22, upper clamp; 23, clamping driver; 24, pressure relief assembly; 241, insulating pressure block; 242, pressure elastic member; 3, wheel rim workpiece; 4, local cooling assembly; 41, Blowing structure; 42. Air source connecting pipe; 5. Butt welding electrode; 6. Endothermic heat conduction barrier component; 61. Heat conductor; 62. Heat exchange endothermic component; 621. Low-temperature fluid channel; 622. Blowing hole; 7. Alignment plug plate; 71. Plug plate moving driver; 72. Grinding block; 73. Dust suction hole; 74. Dust suction pipe; 8. Rim rotation drive component; 81. Driving wheel set; 82. Matching wheel set; 83. Elastic support. DETAILED DESCRIPTION

[0040] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0041] Refer to the instruction manual Figures 1 to 9 A welding device for aluminum rim production includes a machine base 1, on which a clamping assembly 2 is arranged, the clamping assembly 2 includes a first clamping assembly 201 and a second clamping assembly 202, the first clamping assembly 201 and the second clamping assembly 202 are both composed of a lower clamp 21 and an upper clamp 22, the lower clamp 21 and the upper clamp 22 are provided with clamping surfaces corresponding to the external shape of a rim workpiece 3, the upper clamp 22 clamps the rim workpiece 3 by approaching the lower clamp 21, and the second clamping assembly 202 applies pressure to the two end surfaces of the rim workpiece 3 by approaching the first clamping assembly 201.

[0042] The clamping assembly 2 further includes a clamping driver 23, an upper clamp 22 is mounted on the output end of the clamping driver 23, an upset moving seat 11 is slidably arranged on the machine base 1, an upset driver 111 is also arranged on the machine base 1, and the upset driver 111 is used to drive the upset moving seat 11 to move, the second clamping assembly 202 is mounted on the upset moving seat 11, and the lower clamp 21 and the clamping driver 23 of the first clamping assembly 201 are both fixedly mounted on the machine base 1, and the lower clamp 21 and the clamping driver 23 of the second clamping assembly 202 are both fixedly mounted on the upset moving seat 11, so that in actual use When the rim workpiece 3 is placed on the two sets of lower clamps 21, the clamping driver 23 is controlled to drive the upper clamp 22 to approach the lower clamp 21 to clamp the rim workpiece 3, and the welding electrode 5 also forms a good conductive contact with the rim workpiece 3. At the same time, the gap formed between the two end faces of the rim workpiece 3 is located between the first clamping component 201 and the second clamping component 202. Then, the forging movable seat 11 is controlled to move so that the second clamping component 202 and the first clamping component 201 are close to each other, so that the two end faces of the rim workpiece 3 can be controlled to contact and provide extrusion force during subsequent forging.

[0043] It should be noted that the moving trajectory of the upsetting movable seat 11 can be lateral movement or arc movement, preferably arc movement. For the clamping driver 23 and the upsetting driver 111, linear drive devices such as cylinders or hydraulic cylinders can be selected, but in order to provide sufficient pressure, a cylinder structure is preferred.

[0044] The lower clamp 21 is provided with a butt welding electrode 5 for contacting the rim workpiece 3, and the base 1 is also provided with other equipment required for butt welding (such as a power supply system, a control system, and a conductive system, etc. Since the butt welding technology and the corresponding equipment are commonly used welding solutions in the prior art, they will not be explained in detail in this embodiment).

[0045] An auxiliary support plate 12 is arranged at a position on the machine base 1 corresponding to the bottom of the rim workpiece 3. The auxiliary support plate 12 is used to provide auxiliary support for the rim workpiece 3. A local cooling component 4 is arranged on the auxiliary support plate 12. The local cooling component 4 is away from the welding position of the rim workpiece 3. The local cooling component 4 is used to cool the position of the rim workpiece 3 away from the welding area.

[0046] Both the lower clamp 21 and the upper clamp 22 are provided with an endothermic heat conduction barrier component 6, which is used to absorb heat on the surface of the rim workpiece 3 to prevent the heat generated during welding from being conducted to other areas of the rim workpiece 3, thereby reducing the overall heating effect of the rim workpiece 3.

[0047] In actual use, the rim workpiece 3 is first placed on the two groups of lower clamps 21, and the gap between the two end faces of the rim workpiece 3 is located in the area between the first clamping component 201 and the second clamping component 202, and then the two groups of clamping drivers 23 are used to control the two groups of upper clamps 22 to approach the lower clamp 21 to clamp the rim workpiece 3, and then the forging driver 111 is controlled to drive the forging moving seat 11 to move toward the first clamping component 201, so that the two end faces of the rim workpiece 3 are initially contacted to ensure good electrical contact. This step helps to improve the current transfer efficiency and reduce the flash or slag that may occur during welding. Then, a large current is passed through the rim workpiece 3 through the welding electrode 5, so that the large current flows through the contact position between the two end faces of the rim workpiece 3 for a short time, and the heat generated by the resistance is used to rapidly heat the area to a state close to the melting point but not completely melted. At this time, the end face of the rim workpiece 3 is in a state of plastic deformation, the so-called "thermoplastic zone". When the end face of the rim workpiece 3 reaches an appropriate temperature, the upset driver 111 drives the upset moving seat 11 to continue to move and apply a larger upset force, forcing the two end faces of the rim workpiece 3 to fit tightly and diffuse with each other in a plastic state to form a strong metallurgical bond (the upset process not only promotes the direct bonding between metal atoms, but also can squeeze out oxides and other impurities generated during the welding process, thereby obtaining a high-quality welded joint). The welding of the end face of the rim workpiece 3 can be achieved, and then after waiting for the rim workpiece 3 to cool down, the clamping of the rim workpiece 3 can be released, and the rim workpiece 3 can be removed for subsequent processing.

[0048] In the above process, a local cooling component 4 and an endothermic heat conduction barrier component 6 are provided, and with the aid of the endothermic heat conduction barrier component 6, the heat on the rim workpiece 3 in the area of ​​the lower clamp 21 and the upper clamp 22 is absorbed, thereby reducing the spread of welding heat to other areas of the rim workpiece 3, thereby reducing the expansion of air in the inner closed space of the rim workpiece 3. At the same time, with the aid of the local cooling component 4, the rim workpiece 3 is cooled at a position away from the welding processing area of ​​the rim workpiece 3, so that the air in the inner closed space of this area of ​​the rim workpiece 3 shrinks, thereby compensating for the expansion of air in the inner closed space in the welding area of ​​the rim workpiece 3, so that the air pressure in the inner closed space of the rim workpiece 3 is uniform during welding, and no pressure deformation is caused to the side wall or welding area of ​​the thin-walled rim workpiece 3, thereby improving the processing quality of the double-layer thin-walled rim workpiece 3, reducing the amount of subsequent shaping work, and improving production efficiency.

[0049] It should be noted that after welding is completed, the rim workpiece 3 can be drilled after rounding. At this time, the inner space of the rim workpiece 3 is no longer closed and will no longer be affected by air pressure.

[0050] In the above embodiment, the local cooling component 4 includes a blowing structure 41. Figure 2The blowing structure 41 is fixedly mounted on the auxiliary support plate 12, and the air outlet of the blowing structure 41 is arranged corresponding to the rim workpiece 3. The blowing structure 41 is connected to the low-temperature gas source supply system through the gas source connecting pipe 42. The low-temperature gas source supply system is used to provide low-temperature gas to the blowing structure 41. The low-temperature gas source supply system includes a low-temperature gas source and an air pump assembly. The low-temperature gas source includes a gas cooling device. The above-mentioned gas cooling device is used to cool the air transported by the air pump. For example, a refrigeration device or a freezing device is used to cool the air in a fixed area to make it lower than the normal temperature. Liquid nitrogen can also be directly used to make the blowing structure 41 directly blow out low-temperature nitrogen, so that the mechanical energy of the rim workpiece 3 can be quickly cooled.

[0051] For further information, please refer to the attached manual. Figure 5 The heat-absorbing heat conduction barrier component 6 includes a heat-conducting member 61. The heat-conducting member 61 is disposed in the lower clamp 21 and the upper clamp 22. The heat-conducting member 61 is made of a heat-conducting material (such as aluminum oxide, aluminum nitride, etc.). The heat-conducting member 61 is fixedly installed inside the lower clamp 21 or the upper clamp 22, and contacts with the surface of the rim workpiece 3 when the lower clamp 21 and the upper clamp 22 clamp the rim workpiece 3. Therefore, when heat is generated during welding, the heat of the rim workpiece 3 is absorbed at the lower clamp 21 and the upper clamp 22, thereby reducing the conduction of heat in the rim workpiece 3 to other locations.

[0052] Further, in order to improve the barrier effect of the endothermic heat conduction barrier component 6, this embodiment also provides the following solution. For details, refer to the attached specification. Figure 5 The heat absorption type heat conduction barrier component 6 also includes a heat exchange type heat absorption component 62. The heat exchange type heat absorption component 62 is arranged in the lower clamp 21 and the upper clamp 22. The heat exchange type heat absorption component 62 includes a low-temperature fluid channel 621. The low-temperature fluid channel 621 is connected to a low-temperature fluid source through a pipeline. The low-temperature fluid source includes a low-temperature fluid and a delivery pump. The delivery pump is used to deliver the low-temperature fluid to the low-temperature fluid channel 621. When the rim workpiece 3 generates heat during welding, the low-temperature fluid flowing inside the lower clamp 21 and the upper clamp 22 can absorb the heat, thereby improving the barrier effect on the heat conduction on the main body of the rim workpiece 3, and reducing the temperature rise effect inside the rim workpiece 3.

[0053] Furthermore, the above-mentioned low-temperature fluid source is preferably a low-temperature gas source, which is the same as the low-temperature gas source connected to the blowing structure 41. A blowing hole 622 is provided on the low-temperature fluid channel 621. The blowing hole 622 is arranged away from the welding area of ​​the rim workpiece 3, and the blowing hole 622 is arranged toward the surface of the rim workpiece 3. In actual use, low-temperature gas is input into the blowing hole 622 through an air pump. While absorbing heat, the gas is output from the blowing hole 622 to the surface of the rim workpiece 3, thereby further cooling the rim workpiece 3 and improving the cooling effect on the rim workpiece 3.

[0054] In the above embodiment, through the arrangement of the above-mentioned endothermic heat conduction barrier component 6 and the local cooling component 4, the main high temperature area of ​​the rim workpiece 3 is concentrated in the area between the first clamping component 201 and the second clamping component 202. If the material in this area is subjected to uneven force, it is easy to form internal stress concentration in the temperature difference area, and even cause damage in severe cases. Therefore, when clamping the rim workpiece 3, it is necessary to ensure precise clamping so that the end faces of the rim workpiece 3 can be more accurately connected and forged. For this purpose, refer to the attached manual. Figure 6 and Figure 7 , the machine base 1 is also provided with an alignment plug plate 7, which is located in the area between the first clamping component 201 and the second clamping component 202, and is set corresponding to the gap between the two end faces of the rim workpiece 3. The end of the alignment plug plate 7 is set in a blade shape. The alignment plug plate 7 can be telescopically slidably installed on the machine base 1. A plug plate moving driver 71 for controlling the telescopic sliding of the alignment plug plate 7 is installed in the machine base 1. The plug plate moving driver 71 is preferably a cylinder structure, wherein a card slot structure for adapting to the end face of the rim workpiece 3 is provided on the alignment plug plate 7. The thickness value of the alignment plug plate 7 is greater than the distance value between the two end faces of the rim workpiece 3 when it is normally stretched. In actual use, the rim workpiece 3 is first installed on the two The lower clamp 21 is assembled, and then the alignment plug plate 7 is controlled to extend outward through the plug plate moving driver 71, and then the alignment plug plate 7 is inserted into the two end faces of the rim workpiece 3, and the area between the two end faces of the rim workpiece 3 is expanded, so that the two end faces of the rim workpiece 3 slide into the slots on the alignment plug plate 7 and contact with the alignment plug plate 7. Since the position of the alignment plug plate 7 is fixed, when the alignment plug plate 7 is inserted into the area between the two end faces of the rim workpiece 3, the end face of the rim workpiece 3 can be accurately positioned, and then the upper clamp 22 can be controlled to move to tighten and clamp the rim workpiece 3, thereby ensuring the clamping accuracy of the rim workpiece 3 during the initial clamping, and further improving the welding accuracy.

[0055] Furthermore, since the end face of the rim workpiece 3 is formed by cutting, it is easy to cause debris and burrs to remain during cutting. During butt welding, if there is a protruding structure or debris attached to the end face of the rim workpiece 3, it will affect the current passing effect and the contact effect of the two end faces, thereby affecting the welding accuracy and welding quality. For this reason, this embodiment also provides the following technical solutions, specifically, refer to the attached manual Figure 7The alignment plug plate 7 is a hollow structure, and a grinding block 72 is fixedly installed on the side wall of the alignment plug plate 7. Dust suction holes 73 are provided at the side walls of the plug plate moving driver 71 corresponding to the end faces of the rim workpiece 3. The dust suction holes 73 are connected to the inner cavity of the alignment plug plate 7, and the inner cavity of the alignment plug plate 7 is connected to the dust collector assembly through the dust suction pipe 74. Then, in the process of inserting the alignment plug plate 7 into the two end faces of the rim workpiece 3, the relative movement of the grinding block 72 helps to grind off the protruding burrs and residual debris on the end face of the rim workpiece 3, and the dust suction holes 73 and the dust suction pipe 74 are used to remove debris, so that the end face of the rim workpiece 3 is smoother and tidier, and welding errors are reduced.

[0056] In the above embodiment, since the high temperature area is mainly concentrated in the area between the first clamping component 201 and the second clamping component 202, and in order to ensure the welding quality, the welding position cannot be cooled during the welding process. At the same time, in order to ensure that the material extrusion to the outer shape is not hindered during the top forging, sufficient space needs to be reserved near the welding area for effective heat dissipation and material deformation. However, since the material temperature in this area is relatively high, the material itself will expand accordingly. Therefore, the actual extrusion position of the material and the lower clamp 21 and the upper clamp 22 is prone to form irreversible extrusion marks due to the lack of buffering. For this reason, refer to the attached manual. Figure 8 and Fig. 9, the present embodiment also provides the following technical solutions, specifically, a plurality of groups of pressure relief components 24 are arranged on the inner side of one end of the lower clamp 21 and the upper clamp 22 corresponding to the welding area of ​​the rim workpiece 3, and the plurality of groups of pressure relief components 24 are arranged around the rim workpiece 3, the pressure relief components 24 include a plurality of insulating pressure blocks 241 (for example, a ceramic structure), the lower clamp 21 is slidably installed inside the lower clamp 21 or the upper clamp 22, the end of the insulating pressure block 241 is arranged in an arc shape, the end of the insulating pressure block 241 contacts the surface of the rim workpiece 3 when the lower clamp 21 and the upper clamp 22 clamp the rim workpiece 3, and the sliding direction of the insulating pressure block 241 is arranged perpendicular to the surface of the rim workpiece 3 corresponding to it, a pressure elastic member 242 is arranged between the insulating pressure block 241 and the lower clamp 21 or the insulating pressure block 241 and the upper clamp 22, the pressure elastic member 242 is used to provide an elastic force for the insulating pressure block 241 to squeeze the surface of the rim workpiece 3, and to extend along the direction away from the rim workpiece 3, the elastic force of each pressure elastic member 242 is set to increase in sequence, therefore, under the auxiliary support of each group of insulating pressure blocks 241, an auxiliary extrusion pressure can be formed on the surface of the rim workpiece 3, and the auxiliary extrusion pressure gradually increases in the direction away from the welding position of the rim workpiece 3. Therefore, when the welding temperature rises and expands near the welding area of ​​the rim workpiece 3, the insulating pressure blocks 241 can be used to form auxiliary support for the rim workpiece 3 in the deformation area, thereby ensuring that the deformation degree of the rim workpiece 3 is gradually reduced, avoiding the deformation area from being concentrated and causing protruding deformation at the rigid contact position with the lower clamp 21 or the upper clamp 22, and avoiding damage to the transition area between the rim workpiece 3 and the lower clamp 21 and the upper clamp 22 during welding. At the same time, after the welding is completed, as the temperature decreases and the corresponding area gradually shrinks, the elastic extrusion of the insulating pressure blocks 241 can also assist the rim workpiece 3 to produce reset deformation, thereby improving the product quality of the rim workpiece 3.

[0057] For further information, please refer to the attached manual. Figure 1 , Figure 8 and Fig.10In order to enable the rim workpiece 3 to cool quickly after welding is completed for subsequent operations, the present embodiment also provides the following technical solutions. Specifically, an auxiliary support wheel 121 is rotatably installed on the auxiliary support plate 12. The auxiliary support wheel 121 rolls with the rim workpiece 3, and the auxiliary support wheel 121 is an elastic wheel structure, which can be squeezed to produce deformation, and thus will not affect the rim workpiece 3 when the rim workpiece 3 is clamped and squeezed. The clamping assembly 2 is provided with a rim rotation driving assembly 8, and the rim rotation driving assembly 8 includes a driving wheel group 81 and a matching wheel group 82. The driving wheel group 81 is arranged on the lower clamp 21, and the matching wheel group 82 is arranged on the upper clamp 22, wherein the wheel frame of the driving wheel group 81 is slidably installed on the lower clamp 21, and an elastic support member 83 is arranged between the wheel frame of the driving wheel group 81 and the lower clamp 21. The driving wheel group 81 is driven to rotate by a motor, and the driving wheel group 81 rolls with the rim workpiece 3. During the clamping process, the rim workpiece 3 is clamped by the upper clamp After the tool 22 is squeezed, the driving wheel group 81 is pressed down, and when the welding is completed, the upper clamp 22 can be driven to leave the lower clamp 21 for a short distance. At this time, the driving wheel group 81 rises under the elastic support of the elastic support member 83 and keeps in contact with the rim workpiece 3, while the matching wheel group 82 is in contact with the rim workpiece 3 above the rim workpiece 3 (the upper clamp 22 can also be directly driven far away from the lower clamp 21, which will not affect the driving of the rim workpiece 3 by the driving wheel group 81). At this time, the rim workpiece 3 can be driven to rotate with the help of the driving wheel group 81, and the welding position of the rim workpiece 3 is driven to change continuously, and the heat conduction barrier component 6 and the local cooling component 4 are continuously cooled to increase the cooling rate of the rim workpiece 3. At the same time, a certain shaping operation can be performed on the rim workpiece 3, and the position of the high-temperature area can be changed to avoid injuries caused by workers directly holding the rim workpiece 3 when removing it, thereby further improving the processing efficiency of the equipment and enhancing the practicability of the equipment.

[0058] It should be noted that the elastic members used in this embodiment are all commonly used elastic structures, such as springs, reeds, etc. Their specific use and selection needs to be determined according to actual conditions. Therefore, this embodiment will not be explained in detail.

[0059] Refer to the instruction manual Fig.11 The present invention also provides a welding method for aluminum wheel rim production, comprising the following steps:

[0060] Step 1: Place the rim workpiece 3 on the two sets of lower clamps 21, and make the gap between the two end surfaces of the rim workpiece 3 located in the area between the first clamping assembly 201 and the second clamping assembly 202;

[0061] Step 2: Control the two sets of upper clamps 22 to move closer to the lower clamp 21 through the clamping driver 23 to clamp the rim workpiece 3, and then control the upset driver 111 to drive the upset moving seat 11 to move toward the first clamping assembly 201, so that the two end faces of the rim workpiece 3 are initially in contact;

[0062] Step 3: Pass a large current (welding current) through the welding electrode 5 to the rim workpiece 3, so that the large current flows through the contact position between the two end surfaces of the rim workpiece 3 for a short time, and the heat generated by the resistance is used to quickly heat up the area;

[0063] Step 4: Start the endothermic heat conduction barrier component 6 and the local cooling component 4, use the endothermic heat conduction barrier component 6 to prevent the heat on the rim workpiece 3 from spreading to other areas, and use the local cooling component 4 to cool the position of the rim workpiece 3 away from the welding area, so as to balance the air pressure in the inner closed space of the rim workpiece 3;

[0064] Step 5: When the end surface of the rim workpiece 3 reaches a state where the upsetting temperature is close to the melting point but not completely melted, the upsetting driver 111 drives the upsetting moving seat 11 to continue to move and apply upsetting force, so that the two end surfaces of the rim workpiece 3 are closely attached and diffused with each other in a plastic state to form a strong metallurgical bond;

[0065] Step 6: After welding is completed, the upper clamp 22 is driven to leave the rim workpiece 3, and the rim workpiece 3 is driven to rotate by the driving wheel assembly 81, and the rim workpiece 3 is quickly cooled as a whole by means of the local cooling component 4 and the endothermic heat conduction barrier component 6;

[0066] Step seven, remove the wheel rim workpiece 3, reset the equipment, and cool the lower fixture 21 and the upper fixture 22 with the help of the heat exchange heat absorption component 62, so as to restore them to the initial temperature and perform subsequent welding operations.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A welding device for aluminum rim production, characterized in that: The invention comprises a machine base (1), wherein a clamping assembly (2) is arranged on the machine base (1), wherein the clamping assembly (2) comprises a first clamping assembly (201) and a second clamping assembly (202), wherein the first clamping assembly (201) and the second clamping assembly (202) are both composed of a lower clamp (21) and an upper clamp (22), wherein the lower clamp (21) and the upper clamp (22) are provided with clamping surfaces corresponding to the external shape of a rim workpiece (3), and the interior of the lower clamp (21) is provided with a butt welding electrode (5) for contacting the rim workpiece (3); An auxiliary support plate (12) is arranged on the machine base (1) at a position corresponding to the bottom of the rim workpiece (3); a local cooling component (4) is arranged on the auxiliary support plate (12); the local cooling component (4) is far away from the welding position of the rim workpiece (3); and the local cooling component (4) is used to cool the position of the rim workpiece (3) far away from the welding area; Both the lower clamp (21) and the upper clamp (22) are provided with an endothermic heat conduction obstruction component (6), which is used to absorb heat from the surface of the rim workpiece (3) to prevent the heat generated during welding from being conducted to other areas of the rim workpiece (3).

2. A welding device for aluminum rim production according to claim 1, characterized in that: The local cooling component (4) comprises an air blowing structure (41), wherein the air blowing structure (41) is fixedly mounted on the auxiliary support plate (12), an air outlet of the air blowing structure (41) is arranged corresponding to the rim workpiece (3), and the air blowing structure (41) is connected to a low-temperature air source supply system via an air source connecting pipe (42), and the low-temperature air source supply system is used to provide low-temperature gas to the air blowing structure (41).

3. A welding device for aluminum rim production according to claim 2, characterized in that: The endothermic heat conduction barrier component (6) comprises a heat conductive member (61) which is made of a heat conductive material. The heat conductive member (61) is fixedly mounted inside the lower clamp (21) or the upper clamp (22) and contacts the surface of the rim workpiece (3) when the lower clamp (21) and the upper clamp (22) clamp the rim workpiece (3).

4. A welding device for aluminum rim production according to claim 3, characterized in that: The heat-absorbing heat conduction barrier component (6) further comprises a heat-exchange heat-absorbing component (62), and the heat-exchange heat-absorbing component (62) is disposed in both the lower clamp (21) and the upper clamp (22), and the heat-exchange heat-absorbing component (62) comprises a low-temperature fluid channel (621), and the low-temperature fluid channel (621) is connected to a low-temperature fluid source via a pipeline, and the low-temperature fluid source comprises a low-temperature fluid and a delivery pump, and the delivery pump is used to deliver the low-temperature fluid to the low-temperature fluid channel (621).

5. A welding device for aluminum rim production according to claim 4, characterized in that: The low-temperature fluid source is a low-temperature gas source, and a blowing hole (622) is provided on the low-temperature fluid channel (621). The blowing hole (622) is arranged away from the welding area of ​​the rim workpiece (3), and the blowing hole (622) is arranged toward the surface of the rim workpiece (3).

6. A welding device for aluminum rim production according to claim 5, characterized in that: The lower clamp (21) and the upper clamp (22) are both provided with a plurality of groups of pressure relief components (24) on the inner side of one end of the welding area of ​​the rim workpiece (3), and the plurality of groups of pressure relief components (24) are arranged around the rim workpiece (3). The pressure relief components (24) include a plurality of insulating pressure blocks (241). The lower clamp (21) is slidably installed inside the lower clamp (21) or the upper clamp (22). The end of the insulating pressure block (241) is arranged in an arc shape. The end of the insulating pressure block (241) is formed when the lower clamp (21) and the upper clamp (22) form a pressure relief component on the rim workpiece (3). When clamped, it contacts the surface of the rim workpiece (3), and the sliding direction of the insulating pressure block (241) is perpendicular to the surface of the corresponding rim workpiece (3). A pressure elastic member (242) is provided between the insulating pressure block (241) and the lower clamp (21) or between the insulating pressure block (241) and the upper clamp (22). The pressure elastic member (242) is used to provide an elastic force for the insulating pressure block (241) to press against the surface of the rim workpiece (3), and the elastic force of each pressure elastic member (242) is increased in sequence along the direction away from the welding area of ​​the rim workpiece (3).

7. A welding device for aluminum rim production according to claim 6, characterized in that: The clamping assembly (2) also includes a clamping driver (23), the upper clamp (22) is mounted on the output end of the clamping driver (23), an upsetting movable seat (11) is slidably arranged on the machine base (1), and an upsetting driver (111) is also arranged on the machine base (1), and the upsetting driver (111) is used to drive the upsetting movable seat (11) to move, the second clamping assembly (202) is mounted on the upsetting movable seat (11), the lower clamp (21) and the clamping driver (23) of the first clamping assembly (201) are both fixedly mounted on the machine base (1), and the lower clamp (21) and the clamping driver (23) of the second clamping assembly (202) are both fixedly mounted on the upsetting movable seat (11).

8. A welding device for aluminum rim production according to claim 7, characterized in that: The machine base (1) is provided with an alignment plug plate (7), the alignment plug plate (7) is located in the area between the first clamping component (201) and the second clamping component (202), and is arranged corresponding to the gap between the two end faces of the rim workpiece (3), the end of the alignment plug plate (7) is arranged in a blade shape, the alignment plug plate (7) is telescopically slidably installed on the machine base (1), the machine base (1) is provided with a plug plate moving driver (71) for controlling the telescopic sliding of the alignment plug plate (7), the alignment plug plate (7) is provided with a slot structure for matching with the end face of the rim workpiece (3), and the thickness of the alignment plug plate (7) is greater than the distance between the two end faces of the rim workpiece (3) when the rim workpiece (3) is normally stretched.

9. A welding device for aluminum rim production according to claim 8, characterized in that: An auxiliary support wheel (121) is rotatably mounted on the auxiliary support plate (12), the auxiliary support wheel (121) is in rolling cooperation with the rim workpiece (3), and the auxiliary support wheel (121) is an elastic wheel structure. A rim rotation drive assembly (8) is arranged on the clamping assembly (2), and the rim rotation drive assembly (8) comprises a driving wheel group (81), the driving wheel group (81) is arranged on the lower clamp (21), the wheel frame of the driving wheel group (81) is slidably mounted on the lower clamp (21), an elastic support member (83) is arranged between the wheel frame of the driving wheel group (81) and the lower clamp (21), the driving wheel group (81) is driven to rotate by a motor, and the driving wheel group (81) is in rolling cooperation with the rim workpiece (3).

10. A welding method for a welding device for aluminum rim production as claimed in claim 9, characterized in that: The following steps are involved: Step 1: placing the wheel rim workpiece (3) on two sets of lower fixtures (21); Step 2: Control the two groups of upper clamps (22) to move closer to the lower clamp (21) to clamp the rim workpiece (3) through the clamping driver (23), and then control the upset driver (111) to drive the upset moving seat (11) to move toward the first clamping assembly (201) so that the two end faces of the rim workpiece (3) are in contact; Step 3: Passing a welding current through the welding electrode (5) to the wheel rim workpiece (3), so that the welding current passes through the contact position between the two end surfaces of the wheel rim workpiece (3), and the heat generated by the resistance is used to heat up the area; Step 4: start the endothermic heat conduction barrier component (6) and the local cooling component (4), use the endothermic heat conduction barrier component (6) to prevent the heat on the rim workpiece (3) from spreading to other areas, and use the local cooling component (4) to cool the position of the rim workpiece (3) away from the welding area; Step 5: When the end surface of the rim workpiece (3) reaches the upsetting temperature, the upsetting driver (111) drives the upsetting movable seat (11) to continue to move and apply the upsetting force; Step 6: After the welding is completed, the upper clamp (22) is driven to leave the wheel rim workpiece (3), and the wheel rim workpiece (3) is driven to rotate by the driving wheel assembly (81), and the wheel rim workpiece (3) is cooled by means of the local cooling component (4) and the heat absorption heat conduction barrier component (6); Step 7: Remove the wheel rim workpiece (3).

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