A welding device and method for the production of aluminum rims

Abstract

The present invention discloses a welding device and method for the production of aluminum rims, specifically relating to the technical field of welding processing. The device includes a machine base, on which a clamping assembly is provided. At a position corresponding to the bottom of the rim workpiece on the machine base, an auxiliary support plate is provided, and a local cooling assembly is arranged on the auxiliary support plate. The local cooling assembly is used to cool the position of the rim workpiece away from the welding area. Inside both the lower clamp and the upper clamp, an endothermic heat conduction obstruction assembly is provided, which is used to absorb the heat on the surface of the rim workpiece. The present invention can reduce the spread of welding heat to other areas of the rim workpiece. At the same time, it locally cools the rim workpiece, compensates for the air expansion in the inner closed space of the welding area of the rim workpiece, thereby improving the processing quality of double-layer thin-walled rim workpieces, reducing the subsequent shaping workload, and improving production efficiency.

Description

Technical Field

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

[0002] A bicycle rim (also known as a wheel rim) is an important component of a bicycle wheel set. It not only supports the tire and inner tube but also, together with components such as spokes and hubs, constitutes a complete wheel system. Among them, aluminum alloy rims (also known as 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 aesthetic diversity.

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

[0004] In the production of aluminum rims, mainly aluminum alloy rods with the same cross-section as the rim are pre-produced, then the rods are bent and cut, and then a welding device is used to weld the two ends of the bent rim blank. A complete circular rim can be formed. The formed rim needs to be drilled with spoke holes and other necessary mounting holes according to the design requirements, then polished and buffed, and finally painted. Then, the rim can be assembled with other components such as tires, inner tubes, hubs, etc. to form a complete bicycle wheel set.

[0005] For the welding of rim blanks, mainly a butt welder is used for processing. First, the two end parts of the rim blank to be welded are respectively fixed on the two clamps of the butt welder 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 through the contact part of the end faces by means of a conductive element. The large current flows through the contact point between the workpiece end faces for a short time, and the heat generated by the resistance makes the area quickly heat up to a state close to the melting point but not completely melted. At this time, the rim end faces are in a state of plastic deformation, that is, the so-called "thermoplastic zone". When the workpiece end faces reach an appropriate temperature, a large upsetting force is immediately applied to force the two end faces to closely fit and diffuse with each other in the plastic state, forming a strong metallurgical bond. The upsetting process not only promotes the direct combination of metal atoms but also can extrude 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. During welding, there is no enclosed space. Therefore, during the actual welding process, even if the welding temperature rise causes the surrounding air temperature to increase, it will not affect the rim itself. For the knife rim, it has a double-layer structure. After bending and butt-jointing at both ends, the inner space of the rim blank will be relatively enclosed (since the rim has not been roundness-adjusted at this time and its circumferential dimension is not accurate, drilling cannot be carried out in advance to avoid low drilling accuracy). Therefore, when the temperature rises during welding, the air in the enclosed inner space will expand. For some wide and thick rims, their internal space is large and the sidewall material has high strength. Even if the air in the inner space expands, the rim itself can provide sufficient pressure. However, for the rim structure with a relatively narrow overall width and a thin sidewall material, although it can provide effective radial support force during actual use, during welding heating, since the rim has not undergone heat treatment and has relatively low hardness, and during welding, the thin-walled rim has faster and wider heat conduction, resulting in a relatively high overall temperature rise of the rim and a relatively increased deformation ability. At this time, the air in the inner space is heated and expands, easily squeezing the sidewall of the inner space of the rim, causing irreversible micro-deformation, affecting the overall accuracy of the rim. Especially during the welding process, the end face part of the rim is in a state close to the melting point but not completely melted, and is more likely to be deformed by air pressure, affecting the welding quality, increasing subsequent processing procedures, and increasing production costs. Summary of the Invention

[0007] A welding device and method for aluminum rim production provided by the present invention aims to solve the problem that in the actual welding process of existing butt welding equipment, the welding temperature rise causes the air in the enclosed inner space to expand. For the rim structure with a thin sidewall material, it is easy to squeeze the sidewall of the inner space of the rim, resulting in irreversible micro-deformation and affecting the overall accuracy of the rim.

[0008] To achieve the above object, the present invention provides the following technical solution: A welding device for aluminum rim production includes a machine base. A clamping assembly is arranged on the machine base. The clamping assembly includes a first clamping assembly and a second clamping assembly. Both the first clamping assembly and the second clamping assembly are composed of a lower clamp and an upper clamp. Clamping surfaces corresponding to the external shape of the rim workpiece are arranged on the lower clamp and the upper clamp. A butt welding electrode for contacting the rim workpiece is arranged inside the lower clamp.

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

[0010] An endothermic heat conduction hindrance component is provided inside both the lower fixture and the upper fixture. The endothermic heat conduction hindrance component is used to absorb the heat on the surface of the wheel workpiece, so as to hinder the conduction of the heat generated during welding to other areas of the wheel workpiece.

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

[0012] In a preferred embodiment, the endothermic heat conduction hindrance component includes a heat conducting member. The heat conducting member is made of a heat conducting material. The heat conducting member is fixedly installed inside the lower fixture or the upper fixture and contacts the surface of the wheel workpiece when the lower fixture and the upper fixture clamp the wheel workpiece.

[0013] In a preferred embodiment, the endothermic heat conduction hindrance component further includes a heat exchange endothermic component. A heat exchange endothermic component is provided inside both the lower fixture and the upper fixture. The heat exchange endothermic component includes a low-temperature fluid channel. 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 into the low-temperature fluid channel.

[0014] In a preferred embodiment, the low-temperature fluid source is a low-temperature gas source. The low-temperature fluid channel is provided with air blowing holes. The air blowing holes are arranged away from the welding area of the wheel workpiece and face the surface of the wheel workpiece.

[0015] In a preferred embodiment, multiple groups of pressure relief components are provided on the inner sides of one ends of the lower fixture and the upper fixture corresponding to the welding area of the wheel workpiece, and the multiple groups of pressure relief components are arranged around the circumference of the wheel workpiece. The pressure relief component includes a plurality of insulating blocks. The insulating blocks are slidably installed inside the lower fixture or the upper fixture. The end of the insulating block is arc-shaped. The end of the insulating block contacts the surface of the wheel workpiece when the lower fixture and the upper fixture clamp the wheel workpiece. And the sliding direction of the insulating block is perpendicular to the surface of the corresponding wheel workpiece. A pressure applying elastic member is arranged between the insulating block and the lower fixture or between the insulating block and the upper fixture. The pressure applying elastic member is used to provide an elastic force for squeezing the insulating block towards the surface of the wheel workpiece, and along the direction away from the welding area of the wheel workpiece, the elastic forces of the pressure applying elastic members increase in sequence.

[0016] In a preferred embodiment, the clamping assembly further includes a clamping driver. The upper clamp is mounted on the output end of the clamping driver. A upsetting moving seat is slidably arranged on the machine base. A upsetting driver is also arranged on the machine base. The upsetting driver is used to drive the upsetting moving seat to move. The second clamping assembly is mounted on the upsetting moving seat. The lower clamp of the first clamping assembly and the clamping driver are both fixedly mounted on the machine base. The lower clamp of the second clamping assembly and the clamping driver are both fixedly mounted on the upsetting moving seat.

[0017] In a preferred embodiment, a positioning plug board is arranged on the machine base. The positioning plug board is located in the area between the first clamping assembly and the second clamping assembly and is arranged corresponding to the gap between the two end faces of the rim workpiece. The end of the positioning plug board is set in a blade shape. The positioning plug board is slidably and telescopically mounted on the machine base. A plug board moving driver for controlling the telescopic sliding of the positioning plug board is installed in the machine base. A clamping groove structure for adapting to the end face of the rim workpiece is arranged on the positioning plug board. The thickness value of the positioning plug board is greater than the distance value between the two end faces of the rim workpiece under normal stretching.

[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 of an elastic wheel structure. A rim rotation driving assembly is arranged on the clamping assembly. The rim rotation driving assembly includes a driving wheel set. The driving wheel set is arranged on the lower clamp. The wheel frame of the driving wheel set is slidably mounted on the lower clamp. An elastic support member is arranged between the wheel frame of the driving wheel set and the lower clamp. The driving wheel set is driven by a motor to rotate and is in rolling cooperation with the rim workpiece.

[0019] A welding method for aluminum rim production includes the following steps:

[0020] Step 1: Place the rim workpiece on the two groups of lower clamps;

[0021] Step 2: Control the two groups of upper clamps to approach the lower clamps respectively through the clamping driver to clamp the rim workpiece, and then control the upsetting driver to drive the upsetting moving seat to move towards the first clamping assembly so that the two end faces of the rim workpiece are in contact;

[0022] Step 3: Pass a welding current through the rim workpiece by the butt welding electrode, so that the welding current passes through the contact position between the two end faces of the rim workpiece, and use the heat generated by the resistance to raise the temperature of this area;

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

[0024] Step Five: After the end face of the rim workpiece reaches the upsetting temperature, drive the upsetting moving seat to continue moving by the upsetting driver to apply the upsetting force;

[0025] Step Six: After welding is completed, drive the upper fixture away from the rim workpiece, drive the rim workpiece to rotate by the driving wheel set, and cool down the rim workpiece by means of the local cooling component and the endothermic heat conduction hindrance component;

[0026] Step Seven: Remove the rim workpiece.

[0027] The beneficial effects of the present invention are as follows: By means of the endothermic heat conduction hindrance component, the present invention absorbs the heat on the rim workpiece in the areas of the lower fixture and the upper fixture, reduces the spread of welding heat to other areas of the rim workpiece, and further reduces the air expansion in the inner closed space of the rim workpiece. At the same time, by means of the local cooling component, the rim workpiece is cooled at a position away from the welding processing area of the rim workpiece, so that the air in the inner closed space of this area of the rim workpiece contracts, thereby compensating for the air expansion in the inner closed space of the welding area of the rim workpiece, and will not cause pressure deformation to the side wall or the welding area of the thin-walled rim workpiece, thereby improving the processing quality of the double-layer thin-walled rim workpiece, reducing the subsequent shaping workload, and improving the production efficiency. 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 sectional view of the present invention.

[0030] Figure 3 It is a schematic diagram of the end face structure of the rim workpiece when the clamping component 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 diagram of the structure of the endothermic heat conduction hindrance component in the lower fixture and the upper fixture of the present invention.

[0033] Figure 6 It is a state diagram of the positioning of the end face of the rim workpiece by the alignment plug board before clamping the rim workpiece of the present invention.

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

[0035] Figure 8 It is a structural diagram of the present invention after improving the clamping component.

[0036] Figure 9 For the present invention Figure 8 Enlarged view of the structure of part A.

[0037] Figure 10 This is a state diagram of the rim workpiece when it rotates after the welding of the present invention is completed.

[0038] Figure 11 This is a flow chart of the welding method of the present invention.

[0039] Reference numerals are: 1, machine base; 11, upsetting moving seat; 111, upsetting driver; 12, auxiliary support plate; 121, auxiliary support wheel; 2, clamping assembly; 201, first clamping assembly; 202, second clamping assembly; 21, lower fixture; 22, upper fixture; 23, clamping driver; 24, pressure relief assembly; 241, insulating pressing block; 242, pressing elastic member; 3, rim workpiece; 4, local cooling assembly; 41, blowing structure; 42, gas source connecting pipe; 5, butt welding electrode; 6, endothermic heat conduction hindrance assembly; 61, heat conducting member; 62, heat exchange type endothermic assembly; 621, low temperature fluid channel; 622, air blowing hole; 7, alignment plug board; 71, plug board moving driver; 72, grinding block; 73, dust suction hole; 74, dust suction pipe; 8, rim rotation driving assembly; 81, driving wheel set; 82, matching wheel set; 83, elastic support member. Detailed implementation manners

[0040] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0041] Referring to the attached Figures 1 to 9 specification drawings, a welding device for aluminum rim production includes a machine base 1. A clamping assembly 2 is arranged on the machine base 1. The clamping assembly 2 includes a first clamping assembly 201 and a second clamping assembly 202. Both the first clamping assembly 201 and the second clamping assembly 202 are composed of a lower fixture 21 and an upper fixture 22. Clamping surfaces corresponding to the external shape of the rim workpiece 3 are arranged on the lower fixture 21 and the upper fixture 22. The upper fixture 22 clamps the rim workpiece 3 by approaching the lower fixture 21, and the second clamping assembly 202 applies pressure to both end faces of the rim workpiece 3 by approaching the first clamping assembly 201.

[0042] Among them, the clamping assembly 2 further includes a clamping driver 23. The upper clamp 22 is installed at the output end of the clamping driver 23. A upsetting moving seat 11 is slidably arranged on the machine base 1. The machine base 1 is further provided with an upsetting driver 111 for driving the upsetting moving seat 11 to move. The second clamping assembly 202 is installed on the upsetting moving seat 11, while the lower clamp 21 of the first clamping assembly 201 and the clamping driver 23 are both fixedly installed on the machine base 1. The lower clamp 21 of the second clamping assembly 202 and the clamping driver 23 are both fixedly installed on the upsetting moving seat 11. Thus, in actual use, the rim workpiece 3 can be placed on the two groups of lower clamps 21, and then the clamping driver 23 is controlled to drive the upper clamp 22 to approach the lower clamp 21 to clamp the rim workpiece 3. At the same time, the butt welding electrode 5 also forms good electrical contact with the rim workpiece 3. Meanwhile, the gap formed between the two end faces of the rim workpiece 3 is located between the first clamping assembly 201 and the second clamping assembly 202. Then, the upsetting moving seat 11 is controlled to move, so that the second clamping assembly 202 and the first clamping assembly 201 approach each other, and the two end faces of the rim workpiece 3 can be controlled to contact, and the extrusion force can be provided during subsequent upsetting.

[0043] It should be noted that the moving track of the upsetting moving seat 11 can be a lateral movement or an arc movement. Preferably, it moves along an arc. For the clamping driver 23 and the upsetting driver 111, linear driving devices such as cylinders or hydraulic cylinders can be selected. However, in order to provide sufficient pressure, a cylinder structure is preferably used.

[0044] The butt welding electrode 5 for contacting the rim workpiece 3 is arranged inside the lower clamp 21. Other equipment required for butt welding (such as a power supply system, a control system, and a conductive system, etc.) is also arranged inside the machine base 1. Since the butt welding technology and the corresponding equipment are all common welding schemes in the prior art, therefore, this embodiment will not be elaborated too much.

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

[0046] Endothermic heat conduction hindrance assemblies 6 are arranged inside both the lower clamp 21 and the upper clamp 22. The endothermic heat conduction hindrance assemblies 6 are used to absorb the heat on the surface of the rim workpiece 3 to hinder the heat generated during welding from being conducted to other areas of the rim workpiece 3 and reduce the overall temperature rise effect of the rim workpiece 3.

[0047] In actual use, first place the rim workpiece 3 on the two sets of lower fixtures 21, and make the gap between the two end faces of the rim workpiece 3 located in the area between the first clamping assembly 201 and the second clamping assembly 202. Then, control the two sets of upper fixtures 22 to approach the lower fixtures 21 respectively by the two sets of clamping drivers 23 to clamp the rim workpiece 3. Next, control the upsetting driver 111 to drive the upsetting moving seat 11 to move towards the first clamping assembly 201, so that the two end faces of the rim workpiece 3 are initially in contact to ensure good electrical contact. This step helps to improve the current transfer efficiency and reduce flash or slag that may occur during welding. Then, pass a large current through the rim workpiece 3 by the butt 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 use the heat generated by the resistance to quickly heat the area to a state close to the melting point but not completely melted. At this time, the end faces of the rim workpiece 3 are in a state of plastic deformation, that is, the so-called "hot plastic zone". When the end faces of the rim workpiece 3 reach an appropriate temperature, the upsetting driver 111 drives the upsetting moving seat 11 to continue moving to apply a large upsetting force, forcing the two end faces of the rim workpiece 3 to closely adhere and diffuse with each other in the plastic state to form a firm metallurgical bond (the upsetting process not only promotes the direct bond between metal atoms, but also can extrude oxides and other impurities generated during the welding process, so as to obtain a high-quality welded joint), and the welding of the end faces of the rim workpiece 3 can be realized. Then, wait for the rim workpiece 3 to cool down, and then release the clamping of the rim workpiece 3 and remove the rim workpiece 3 for subsequent processing.

[0048] In the above process, by setting the local cooling component 4 and the endothermic heat conduction hindrance component 6, with the help of the endothermic heat conduction hindrance component 6, absorb the heat on the rim workpiece 3 in the areas of the lower fixture 21 and the upper fixture 22, reduce the spread of welding heat to other areas of the rim workpiece 3, and further reduce the air expansion in the inner closed space of the rim workpiece 3. At the same time, with the help of the local cooling component 4, cool the rim workpiece 3 at the position of the rim workpiece 3 far from the welding processing area, so that the air in the inner closed space of this area of the rim workpiece 3 shrinks, and further compensate for the air expansion in the inner closed space of 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 the welding process, and will not cause pressure deformation 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 subsequent shaping workload, and improving the production efficiency.

[0049] It should be noted that after welding is completed, the rim workpiece 3 can be subjected to drilling operations after being roundness adjusted. 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, refer to the attached instruction Figure 2The blowing structure 41 is fixedly mounted on the auxiliary support plate 12, and the air outlet of the blowing structure 41 is set 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 delivered 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 normal temperature. Liquid nitrogen can also be used directly to make the blowing structure 41 directly blow out low-temperature nitrogen, which can quickly cool the rim workpiece 3 mechanically.

[0051] Further, refer to the instructions attached Figure 5 The heat-absorbing heat conduction barrier component 6 includes a heat conductor 61. The heat conductor 61 is provided in the lower clamp 21 and the upper clamp 22. The heat conductor 61 is made of a heat-conducting material (such as aluminum oxide, aluminum nitride, etc.). The heat conductor 61 is fixedly installed 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. 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, reducing the conduction of heat in the rim workpiece 3 to other positions.

[0052] Furthermore, in order to improve the barrier effect of the endothermic heat conduction barrier component 6, this embodiment also provides the following solution. For details, please refer to the attached manual. Figure 5 The heat-absorbing heat conduction barrier component 6 also includes a heat-exchange heat-absorbing component 62. The heat-exchange heat-absorbing component 62 is provided in the lower clamp 21 and the upper clamp 22. The heat-exchange heat-absorbing 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 effect of hindering heat conduction on the rim workpiece 3 body 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 set away from the welding area of the rim workpiece 3, and the blowing hole 622 is set toward the surface of the rim workpiece 3. Then, 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, 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 endothermic heat conduction hindrance 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 unevenly stressed, internal stress concentration is likely to form in the temperature difference area, and even cause damage in severe cases. Therefore, when clamping the rim workpiece 3, precise clamping needs to be ensured to facilitate more precise butt joint and upsetting of the end faces of the rim workpiece 3. For this purpose, referring to the appended drawings of the specification Figure 6 and Figure 7 , a positioning plug 7 is further provided on the machine base 1. The positioning plug 7 is located in the area between the first clamping component 201 and the second clamping component 202 and is provided corresponding to the gap between the two end faces of the rim workpiece 3. The end of the positioning plug 7 is set in a blade shape. The positioning plug 7 is telescopically and slidably installed on the machine base 1. A plug moving driver 71 for controlling the telescopic sliding of the positioning plug 7 is installed in the machine base 1. The plug moving driver 71 is preferably a cylinder structure. Among them, a slot structure for adapting to the end face of the rim workpiece 3 is provided on the positioning plug 7. The thickness value of the positioning plug 7 is greater than the distance value between the two end faces of the rim workpiece 3 under normal stretching. In actual use, first install the rim workpiece 3 on the two lower jigs 21, and then control the positioning plug 7 to extend outward through the plug moving driver 71. Then the positioning plug 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 both end faces of the rim workpiece 3 slide into the slots on the positioning plug 7 and contact the positioning plug 7. Since the position of the positioning plug 7 is fixed, when the positioning plug 7 is inserted into the area between the two end faces of the rim workpiece 3, the end faces of the rim workpiece 3 can be precisely positioned, and then the upper jig 22 can be controlled to move to tightly clamp the rim workpiece 3, thereby ensuring the clamping accuracy of the rim workpiece 3 during initial clamping and further improving the welding accuracy.

[0055] Furthermore, since the end faces of the rim workpiece 3 are formed by cutting, debris and burrs are likely to remain during cutting. During butt welding, if there are protruding structures or foreign substances attached to the end faces of the rim workpiece 3, it will affect the current passing effect and the contact effect between the two end faces, thereby affecting the welding accuracy and welding quality. For this reason, the present embodiment also provides the following technical solutions. Specifically, referring to the appended drawings of the specification Figure 7, the alignment plug 7 is of a hollow structure. A grinding block 72 is fixedly installed on the side wall of the alignment plug 7. Dust suction holes 73 are provided on the side walls of the plug moving driver 71 corresponding to the end faces of the rim workpiece 3. The dust suction holes 73 communicate with the inner cavity of the alignment plug 7. The inner cavity of the alignment plug 7 is connected to a vacuum cleaner assembly through a dust suction pipe 74. Thus, during the process of inserting the alignment plug 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 faces of the rim workpiece 3, and the sundries are sucked away through the dust suction holes 73 and the dust suction pipe 74, making the end faces of the rim workpiece 3 smoother and neater, and reducing welding errors.

[0056] In the above embodiment, since the high-temperature area is mainly concentrated in the area between the first clamping assembly 201 and the second clamping assembly 202, and in order to ensure the welding quality, it is not possible to cool the welding position during the welding process. At the same time, in order to ensure that the extrusion deformation of the material towards the outer shape during upsetting is not hindered, therefore, sufficient space needs to be left near the welding area for effective heat dissipation and the material to deform towards the outer shape. However, since the temperature of the material is relatively high in this area, the material itself will expand accordingly. Therefore, the actual extrusion positions of the material with the lower fixture 21 and the upper fixture 22 are prone to form irreversible extrusion marks due to the lack of buffering. For this reason, refer to the attached drawings of the specification Figure 8 and Figure 9, this embodiment also provides the following technical solutions. Specifically, a plurality of buffer pressure components 24 are provided on the inner sides of one ends of the lower fixture 21 and the upper fixture 22 corresponding to the welding area of the rim workpiece 3, and the plurality of buffer pressure components 24 are arranged around the periphery of the rim workpiece 3. The buffer pressure component 24 includes a plurality of insulating pressure blocks 241 (such as ceramic structures). The insulating pressure blocks 241 are slidably installed inside the lower fixture 21 or the upper fixture 22. The end of the insulating pressure block 241 is arc-shaped. When the lower fixture 21 and the upper fixture 22 clamp the rim workpiece 3, the end of the insulating pressure block 241 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-applying elastic member 242 is provided between the insulating pressure block 241 and the lower fixture 21 or between the insulating pressure block 241 and the upper fixture 22. The pressure-applying elastic member 242 is used to provide an elastic force for squeezing the insulating pressure block 241 toward the surface of the rim workpiece 3, and along the direction away from the welding area of the rim workpiece 3, the elastic forces of the pressure-applying elastic members 242 increase in sequence. Therefore, with the auxiliary support of each group of insulating pressure blocks 241, an auxiliary extrusion force can be formed on the surface of the rim workpiece 3, and the auxiliary extrusion force gradually increases along the direction away from the welding position of the rim workpiece 3. Therefore, when the welding in the welding area of the rim workpiece 3 causes expansion due to temperature rise, with the help of each insulating pressure block 241, an auxiliary support can be formed on the rim workpiece 3 in the deformed area, thereby ensuring that the deformation degree of the rim workpiece 3 gradually decreases, avoiding the concentrated deformation area from generating a protruding deformation at the rigid contact position with the lower fixture 21 or the upper fixture 22, and avoiding damage to the transition area between the rim workpiece 3 and the lower fixture 21 and the upper fixture 22 during the welding process. At the same time, after the welding is completed, during the process of gradual shrinkage of the corresponding area as the temperature decreases, the elastic extrusion of the insulating pressure block 241 can also assist the rim workpiece 3 to generate a reset deformation, improving the product quality of the rim workpiece 3.

[0057] Further, referring to the attached drawings of the specification Figure 1 , Figure 8 and Figure 10, in order to enable the rim workpiece 3 to be quickly cooled after welding for subsequent operations, the present embodiment further 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 is in rolling cooperation with the rim workpiece 3, and the auxiliary support wheel 121 is of an elastic wheel structure and can be deformed by extrusion. Therefore, when the rim workpiece 3 is clamped and extruded, it will not affect the rim workpiece 3. A rim rotation driving assembly 8 is provided on the clamping assembly 2. The rim rotation driving assembly 8 includes a driving wheel set 81 and a mating wheel set 82. The driving wheel set 81 is arranged on the lower clamp 21, and the mating wheel set 82 is arranged on the upper clamp 22. Among them, the wheel frame of the driving wheel set 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 set 81 and the lower clamp 21. The driving wheel set 81 is driven by a motor to rotate, and the driving wheel set 81 is in rolling cooperation with the rim workpiece 3. During the clamping process, after the rim workpiece 3 is extruded by the upper clamp 22, the driving wheel set 81 is pressed down. When the welding is completed, the upper clamp 22 can be driven to leave the lower clamp 21 by a small distance. At this time, the driving wheel set 81 rises under the elastic support of the elastic support member 83 and remains in contact with the rim workpiece 3, while the mating wheel set 82 is in contact with the rim workpiece 3 above the rim workpiece 3 (it is also possible to directly drive the upper clamp 22 to move far away from the lower clamp 21, which will not affect the driving of the driving wheel set 81 on the rim workpiece 3). At this time, the driving wheel set 81 can be used to drive the rim workpiece 3 to rotate, so that the welding position of the rim workpiece 3 changes continuously, and it is continuously cooled by the endothermic heat conduction blocking assembly 6 and the local cooling assembly 4, improving the cooling speed of the rim workpiece 3. At the same time, it can also perform a certain shaping operation on the rim workpiece 3 and change the position of the high-temperature area, avoiding the worker from directly holding the high-temperature area when taking down the rim workpiece 3 and causing injury, 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 common elastic structures, such as springs, spring sheets, etc. The specific use and selection need to be determined according to the actual situation. Therefore, this embodiment will not be elaborated too much.

[0059] Refer to the attached drawings of the specification Figure 11 , the present invention also provides a welding method for aluminum rim production, including the following steps:

[0060] Step 1: Place the rim workpiece 3 on the two groups of lower clamps 21, and make the gap between the two end faces 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 by the clamping driver 23 to approach the lower clamp 21 to clamp the rim workpiece 3, and then control the upsetting driver 111 to drive the upsetting moving seat 11 to move towards 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 rim workpiece 3 by the butt 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 use the heat generated by the resistance to rapidly heat up this area;

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

[0064] Step 5: When the end faces of the rim workpiece 3 reach the upsetting temperature close to the melting point but not completely melted, drive the upsetting moving seat 11 to continue to move by the upsetting driver 111 to apply an upsetting force, so that the two end faces of the rim workpiece 3 are closely attached and diffuse with each other in a plastic state to form a firm metallurgical bond;

[0065] Step 6: After welding is completed, drive the upper clamp 22 away from the rim workpiece 3, drive the rim workpiece 3 to rotate by the driving wheel set 81, and use the local cooling assembly 4 and the endothermic heat conduction hindrance assembly 6 to quickly cool down the rim workpiece 3 integrally;

[0066] Step 7: Remove the rim workpiece 3, reset the equipment, and use the heat exchange endothermic assembly 62 to cool the lower clamp 21 and the upper clamp 22, so as to facilitate returning to the initial temperature and performing subsequent welding operations. [[ID=X]]

[0067] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A welding device for the production of aluminum rims, characterized in that: It includes a machine base (1), on which a clamping assembly (2) is provided. The clamping assembly (2) includes a first clamping assembly (201) and a second clamping assembly (202). Both the first clamping assembly (201) and the second clamping assembly (202) are 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 the rim workpiece (3). Inside the lower clamp (21), a butt welding electrode (5) for contacting the rim workpiece (3) is provided. At a position on the machine base (1) corresponding to the bottom of the rim workpiece (3), an auxiliary support plate (12) is provided. On the auxiliary support plate (12), a local cooling assembly (4) is provided. The local cooling assembly (4) is away from the welding position of the rim workpiece (3), and the local cooling assembly (4) is used to cool the position of the rim workpiece (3) away from the welding area. Inside both the lower clamp (21) and the upper clamp (22), an endothermic heat conduction hindrance assembly (6) is provided. The endothermic heat conduction hindrance assembly (6) is used to absorb the heat on the surface of the rim workpiece (3) to hinder the conduction of the heat generated during welding to other areas of the rim workpiece (3). On the inner sides of one ends of the lower clamp (21) and the upper clamp (22) corresponding to the welding area of the rim workpiece (3), multiple groups of pressure relief assemblies (24) are provided, and the multiple groups of pressure relief assemblies (24) are arranged around the perimeter of the rim workpiece (3). The pressure relief assembly (24) includes a plurality of insulating blocks (241). The insulating blocks (241) are slidably installed inside the lower clamp (21) or the upper clamp (22). The end of the insulating block (241) is arc-shaped. When the lower clamp (21) and the upper clamp (22) clamp the rim workpiece (3), the end of the insulating block (241) contacts the surface of the rim workpiece (3). And the sliding direction of the insulating block (241) is perpendicular to the surface of the corresponding rim workpiece (3). A pressure applying elastic member (242) is provided between the insulating block (241) and the lower clamp (21) or between the insulating block (241) and the upper clamp (22). The pressure applying elastic member (242) is used to provide an elastic force for squeezing the insulating block (241) against the surface of the rim workpiece (3), and in the direction away from the welding area of the rim workpiece (3), the elastic forces of the pressure applying elastic members (242) increase in sequence.

2. The welding device for aluminum rim production according to claim 1, characterized in that: The local cooling assembly (4) includes a blowing structure (41). The blowing structure (41) is fixedly installed on the auxiliary support plate (12). The air outlet of the blowing structure (41) corresponds to the rim workpiece (3). The blowing structure (41) is connected to a low-temperature gas source supply system through a gas source connecting pipe (42), and this low-temperature gas source supply system is used to supply low-temperature gas to the blowing structure (41).

3. The welding device for aluminum rim production according to claim 2, characterized in that: The endothermic heat conduction hindrance component (6) includes a heat conducting member (61), which is made of heat conducting material. The heat conducting member (61) is fixedly installed 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 endothermic heat conduction hindrance component (6) further includes a heat exchange type endothermic component (62). The heat exchange type endothermic component (62) is provided in both the lower clamp (21) and the upper clamp (22). The heat exchange type endothermic 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, and the delivery pump is used to deliver the low-temperature fluid into 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. A blow hole (622) is provided on the low-temperature fluid channel (621). The blow hole (622) is arranged away from the welding area of the rim workpiece (3) and faces the surface of the rim workpiece (3).

6. A welding device for the production of aluminum rims according to claim 5, characterized in that: The clamping assembly (2) further includes a clamping driver (23). The upper clamp (22) is installed on the output end of the clamping driver (23). A upsetting moving seat (11) is slidably arranged on the machine base (1). A upsetting driver (111) is further provided on the machine base (1), and the upsetting driver (111) is used to drive the upsetting moving seat (11) to move. The second clamping assembly (202) is installed on the upsetting moving seat (11). The lower clamp (21) and the clamping driver (23) of the first clamping assembly (201) are both fixedly installed on the machine base (1). The lower clamp (21) and the clamping driver (23) of the second clamping assembly (202) are both fixedly installed on the upsetting moving seat (11).

7. A welding device for aluminum rim production according to claim 6, characterized in that: A positioning insertion plate (7) is provided on the machine base (1). The positioning insertion plate (7) is located in the area between the first clamping assembly (201) and the second clamping assembly (202), and is arranged corresponding to the gap between the two end faces of the rim workpiece (3). The end of the positioning insertion plate (7) is in a blade shape. The positioning insertion plate (7) is slidably installed on the machine base (1) in a telescopic manner. An insertion plate moving driver (71) for controlling the telescopic sliding of the positioning insertion plate (7) is installed inside the machine base (1). A clamping groove structure for adapting to the end face of the rim workpiece (3) is provided on the positioning insertion plate (7). The thickness value of the positioning insertion plate (7) is greater than the distance value between the two end faces of the rim workpiece (3) under normal stretching.

8. A welding device for the production of aluminum rims according to claim 7, 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). The auxiliary support wheel (121) is of an elastic wheel structure. A rim rotation driving assembly (8) is arranged on the clamping assembly (2). The rim rotation driving assembly (8) includes a driving wheel set (81). The driving wheel set (81) is arranged on the lower fixture (21). The wheel frame of the driving wheel set (81) is slidably mounted on the lower fixture (21). An elastic support member (83) is arranged between the wheel frame of the driving wheel set (81) and the lower fixture (21). The driving wheel set (81) is driven to rotate by a motor. The driving wheel set (81) is in rolling cooperation with the rim workpiece (3).

9. A welding method for a welding device used in the production of aluminum rims as described in claim 8, characterized in that, Including the following steps: Step 1: Place the rim workpiece (3) on two groups of lower fixtures (21). Step 2: Control the two groups of upper fixtures (22) to approach the lower fixtures (21) respectively through the clamping driver (23) to clamp the rim workpiece (3), and then control the upsetting driver (111) to drive the upsetting moving seat (11) to move towards the first clamping assembly (201) so that the two end faces of the rim workpiece (3) are in contact. Step 3: Pass a welding current through the rim workpiece (3) by the butt welding electrode (5) so that the welding current passes through the contact position between the two end faces of the rim workpiece (3), and use the heat generated by the resistance to raise the temperature of this area. Step 4: Start the endothermic heat conduction hindrance assembly (6) and the local cooling assembly (4), use the endothermic heat conduction hindrance assembly (6) to prevent the heat on the rim workpiece (3) from spreading to other areas, and cool the position of the rim workpiece (3) away from the welding area through the local cooling assembly (4). Step 5: When the end face of the rim workpiece (3) reaches the upsetting temperature, drive the upsetting moving seat (11) to continue to move by the upsetting driver (111) to apply an upsetting force. Step 6: After welding is completed, drive the upper fixture (22) away from the rim workpiece (3), drive the rim workpiece (3) to rotate by the driving wheel set (81), and cool the rim workpiece (3) by means of the local cooling assembly (4) and the endothermic heat conduction hindrance assembly (6). Step 7: Remove the rim workpiece (3).

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