TWI485023B - Aluminum alloy oil hot plate manufacturing method - Google Patents

Description

Aluminum alloy oil hot plate manufacturing method

The invention relates to a manufacturing method, in particular to a method for manufacturing an aluminum alloy oil hot plate.

The oil hot plate processing method conventionally used in the atmosphere, the flow path is mainly processed by steel drilling. The advantages of the conventional method are that the processing and manufacturing are easy, and the external heating and heat preservation stability of the hot oil is excellent; and the disadvantages thereof are cumbersome, the temperature uniformity is slightly poor due to the thermal resistance factor, and the heating temperature is limited by the hot oil temperature.

For the vacuum process, the oil hot plate is used, and the heat source is mainly provided by embedding the electric heating tube in the aluminum alloy plate, and the thermoelectric enthalpy is used for the feedback control. The utility model has the advantages that the high temperature operation requirement can be provided; the disadvantage is that the temperature uniformity of the oil hot plate is easily affected by the manufacturing quality, the electric heating tube deteriorates and loses function after long-term use, the air heat sealing quality of the electric heating pipe channel is high, and the aluminum alloy welding has the air hole easily. , the occurrence of cracks, etc.

As described above, the vacuum process application of the aluminum alloy oil hot plate mainly uses electric heating, and the large size oil hot plate is made by the slotted buried electric heating tube. Conventionally, the welding of the aluminum alloy hot plate body and the channel cover plate of 6061-T6 or 5083 is carried out, and the welding method includes electron beam, argon welding, friction stir welding and the like. The channel cover plate welding of such oil-hot plate structure is mainly achieved in airtightness, and the weld bead has no pressure load; the disadvantage is that the aluminum alloy channel seal welding is prone to defects such as pores and cracks.

For the process of lower heating temperature and high average temperature characteristic (±1 °C), it is feasible to apply oil hot plate for aluminum alloy, copper and other high heat conductive materials. Aluminum alloy is relatively cheap and easy to machine. Be the first choice. The oil hot plate channel cover plate of the invention is the weakest structure. If the material is made of 6XXX series materials, the strength of the channel cover plate after welding is weakened and the toughness is deteriorated, and deformation, pores and cracks are easily generated during the welding process. The problem is that the finished product will continue to have thermal influence during the use phase and cause the material to become overaged, which will further deteriorate the toughness of the channel cover. Under the influence of the hot oil pressure and the cold and heat of the shutdown operation, the thermal fatigue crack is more likely to occur. , causing leakage of the oil hot plate and affecting the operation of the process machine. Therefore, the weld bead of the oil hot plate should have better mechanical strength and thermal fatigue resistance.

In the various methods of welding aluminum alloys, TIG welding has fewer porosity occurrences than MIG welding, but the welding heat is high, causing high deformation, and the 6XXX-T6 series cover material is over-aged. EB welding is a solution adopted by advanced countries. The quality of the weld bead is excellent under vacuum conditions, but there are still problems of deformation, high equipment investment and manufacturing cost. The friction stir welding of aluminum alloy can obtain the quality of the defect-free bead, which is lower than the manufacturing cost of the electron beam; the disadvantage is that the hollow structure of the similar flow channel may cause deformation of the side of the channel due to the material extrusion relationship during the welding process. Affects the smoothness of the flow of the cooling/heating fluid.

The inventor of the present case has improved the aforementioned heater by the friction stir welding method. Gas seal welding quality (refer to the Republic of China patent invention No. I301780, I321339), but can not further improve the oil temperature plate temperature characteristics (generally ± 3 ~ 5 ° C, depending on the use temperature).

The invention disclosed in the following is the invention for manufacturing a hollow fluid channel structure similar to the oil-hot plate of the present invention, belonging to a fluid channel designed by a structural body grooving process, and then forming a sealed flow channel by sealing the channel cover plate. .

US 2007/163120 A1 uses friction stir welding instead of electron beam welding to produce a cooling plate for a sputtering target. The cooling plate main body 51 pre-processes the fluid channel 52 and engages the channel cover 53 matched with the channel 52. Then apply friction stir welding. The advantage is that the deformation amount of the workpiece after welding is one tenth of the electron beam welding, and the channel cover 53 and the cooling plate main body 51 are designed as shown in FIG. 5.

The Republic of China Patent No. I322735 adopts a friction stir welding process for the production of the cooling plate, and mechanically and cooperatively pre-fixes the channel cover 63 to the channel 62 of the cooling plate main body 61, and does not require an additional clamping fixture to fix the channel cover. 63, the channel cover 63 and the cooling plate main body 61 are designed as shown in FIG. 6.

The Republic of China patent 201043369 uses friction stir welding to produce a cooling plate, mainly by designing the channel cover 73 into a tapered shape, and the cross-sectional width of the channel cover 73 is smaller than the cross-section of the channel 72 of the cooling plate main body 71. The width is wide, and the channel cover 73 is assembled with the cooling plate main body 71, and then subjected to a friction stir welding process for joining, the channel cover 73 and cooling The board main body 71 is designed as shown in FIG.

However, the above three patents are limited by the above-mentioned aluminum alloy in the friction stir welding process due to the material extrusion relationship, which may cause deformation of the side of the channel, and the outer thickness of the channel cover is insufficient, the channel The distance between the cover plate and the main body of the cooling plate is short, which results in limited bearing load capacity of the bead, and the pressure resistance of the finished cover plate is insufficient.

In view of the shortcomings derived from the conventional processing methods described above, the inventors of the present invention actively sought improvement. After years of careful research, the method for manufacturing aluminum alloy oil hot plates was finally developed.

The main object of the present invention is to provide a method for manufacturing an aluminum alloy oil hot plate, which uses a high thermal conductivity aluminum alloy (such as 6XXX series aluminum alloy) as a hot plate body, and a cover plate adopts a non-heat treated aluminum alloy (such as a 5XXX series aluminum alloy). Maintaining the high thermal conductivity of the oil-hot plate material with a combination of dissimilar aluminum alloys, overcoming the cracking problem caused by the high temperature deterioration of the cover plate during the manufacturing of the welding assembly; and slowing down the use of the finished product for a long time at a high temperature, resulting in an aluminum alloy material Deterioration, problems affecting the use of equipment.

Another object of the present invention is to provide a method for manufacturing an aluminum alloy oil hot plate, which uses a friction stir welding method to seal and weld the channel cover plate and the hot plate body. The friction stir welding belongs to solid state welding, and the weld bead has no pores, cracks, etc. Defects, small stress and small deformation in the workpiece after welding, can optimize the weld bead strength Degree, reduce the degree of welding deformation, obtain good weld quality, ensure structural sealing, and the quality reliability is better than traditional welding method.

A further object of the present invention is to provide a method for manufacturing an aluminum alloy oil hot plate, which adopts a "ㄇ" shape for the cover plate, can strengthen the load bearing capacity during the friction stir welding process, change the stress type of the weld bead, and strengthen the oil hot plate. The pressure resistance of the process.

The aluminum alloy oil hot plate of the invention is considered to have better uniform temperature characteristics in consideration of the vacuum process, so it is considered that the aluminum alloy is made of aluminum alloy, and the flow path configuration makes the oil hot plate have better uniform temperature. The oil hot plate structure is similar to the cooling plate. The oil hot plate structure consists of a hot plate body with a groove pre-drilled, a channel cover for covering the channel, and a hot oil inlet and outlet guide. The three components are combined by welding. Need to achieve air tightness, oil pressure resistance, long-term high temperature operation and use.

The applicable temperature range of the oil hot plate is limited by the temperature of the hot oil, but in the applicable temperature range, the rapid heat exchange can achieve better uniform temperature characteristics than the electric oil hot plate. However, the channel needs to withstand the hot oil pressure, and has higher requirements on the mechanical strength of the channel cover combined bead, and also needs good thermal fatigue resistance.

In order to achieve the above characteristics, the hot plate body of the invention is made of 6XXX series aluminum alloy, and the channel cover plate is made of 5XXX series aluminum alloy material, so as to avoid the influence of the welding heat on the channel cover plate or the heat influence of the use process, the welding can be effectively improved. Or use process heat to damage the material of the cover.

In the combined welding method, in addition to the traditional argon welding and electron beam engineering methods, the friction stir welding method is introduced, and the special cover shape matching is designed to reduce the groove. The deformation caused by the combination of the road cover and the hot plate body is strengthened, and the pressure resistance of the cover plate is strengthened, which will make the oil hot plate have good temperature uniformity, and can have stable and reliable weld bead quality and service life.

The aluminum alloy oil hot plate manufacturing method completed by this can create the following benefits:

1. Domestic solar energy plant EVA packaging process oil hot plate estimated annual demand is 100 pcs, expected to sell NT$ 400,000 per pc, the output value benefits can reach NT $ 40 million.

2. At present, the domestic oil hot plate has obtained the import method, and the unit price of the obtained cost is 600,000 yuan; the unit price of the self-developed cost is 400,000 yuan, and the annual demand is 100 pcs, which is expected to reduce the purchase cost by NT$20 million.

3. The friction stir welding technology established in this patent is applicable to the energy of oil hot plate processing technology. In addition to solar panel packaging applications, it can expand the application of oil hot plate manufacturing in other fields, such as oil required for fab and panel factory equipment. Hot plate.

The invention provides a method for manufacturing aluminum alloy oil hot plate. The aluminum alloy oil hot plate is considered to have a good uniform temperature characteristic considering the vacuum process, so it is considered to be made of a high thermal conductivity aluminum alloy to reduce the upper of the oil passage. The temperature difference between the oil passages and the flow path configuration enable the oil hot plate to exhibit better uniform temperature characteristics.

FIG. 1 shows a design example of the arrangement of the hot plate body 1 and the channel 11 of the main body of the oil hot plate, and FIG. 2 and FIG. 3 match the channel cover 2 . The oil hot plate structure is similar to the cooling plate, and the oil hot plate structure is composed of a hot plate pre-digging the channel 11 The body 1, the channel cover 2 matching the channel 11, and the hot oil inlet and outlet guide (not shown), the three components are combined by welding, and need to achieve airtight, oil pressure resistant, long-term high temperature operation Demand.

The temperature range of the oil hot plate is limited by the temperature of the hot oil, but in the applicable temperature range, the rapid heat exchange can obtain better uniform temperature characteristics than the electric oil hot plate; however, the channel 11 is subject to the hot oil pressure, and the groove The combination of the bead cover 2 has higher mechanical strength and also needs good thermal fatigue resistance.

To this end, the specific manufacturing process, including the hot plate design according to the oil hot plate design, respectively, the hot plate body 1 with the fluid channel 11, the channel cover 2 of the matching channel 11, and the hot oil guide, etc. The nozzle and the channel cover 2 are combined by a TIG welding method, and then the channel cover 2 is combined with the hot plate body 1, and the channel cover 2 and the hot plate body 1 are subjected to a friction stir welding method. The weld bead 3 of the combined gap is sealed and welded, and the necessary shaping and finished size processing are performed after welding. As shown in FIG. 4, the combination of the channel cover 2 and the hot plate body 1 is sealed and welded to the channel 3 of the hot plate body 1 by the friction stir welding method using the stirring head 4. Friction stir welding is a solid-state welding. The weld bead 3 has no defects such as porosity and cracks. After welding, the internal stress of the workpiece is small and the deformation is small. The strength of the weld bead 3 can be optimized, the degree of welding deformation can be reduced, and the quality of the weld bead 3 can be obtained to ensure structural tightness. The quality reliability is superior to the traditional welding method.

The hot plate body 1 is made of 6XXX series aluminum alloy (such as 6061T6) Aluminum alloy), the channel cover 2 adopts 5XXX series aluminum alloy (such as 5083 aluminum alloy), and maintains the high thermal conductivity of the oil hot plate material by the combination of the different material aluminum alloys, overcoming the process of manufacturing the welding assembly, the channel cover 2 The problem of cracks caused by high temperature deterioration, and the slow use of the finished product during long-term high temperature conditions, resulting in deterioration of the aluminum alloy material, affecting the function of the equipment.

In addition, the shape matching design of the hot plate body 1 and the channel cover 2 is as shown in FIG. 4, the channel cover 2 adopts a "ㄇ" shape, and the inner edge is designed in a circular arc shape, which can make the fluid flow smoothly. The upper part of the channel cover 2 and the two sides of the friction stir welding are moderately thickened, and the thicker plate thickness requires more materials, but the load bearing capacity during the friction stir welding process is changed, and the weld bead 3 is changed. The stress pattern enhances the pressure resistance of the oil hot plate during use.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

1‧‧‧ hot plate body

11‧‧‧ channel

2‧‧‧Slot cover

3‧‧‧weld

4‧‧‧ mixing head

51, 61, 71‧‧‧ cooling plate body

52, 62, 72‧‧‧ channels

53, 63, 73‧‧‧ channel cover

The technical contents of the present invention and the effects of the objects of the present invention will be further understood by referring to the detailed description of the present invention and the accompanying drawings. FIG. 1 is a diagram showing an example of the design of the oil hot plate of the present invention; Figure (1) of the cover plate of the plate body channel; Figure 3 is an illustration of the cover plate of the body plate matching the hot plate of the present invention (2); Figure 4 is a schematic view showing the combination of the channel cover and the hot plate body of the present invention; Figure 5 is a schematic view showing the structure of the main body and the channel of the cooling plate of US2007163120A1; Figure 2 is a schematic view of the structure of the main body and the channel of the cooling plate of the domestic patent I322735; Schematic diagram of the structure of the cooling plate body and the channel of Patent 177395.

1‧‧‧ hot plate body

11‧‧‧ channel

2‧‧‧Slot cover

3‧‧‧weld

4‧‧‧ mixing head

Claims (4)

The invention relates to a method for manufacturing an aluminum alloy oil hot plate, comprising the following steps: a. preparing a hot plate body by using a high heat conductive aluminum alloy, and processing a fluid channel on the hot plate body; b. making a non-heat treated aluminum alloy to make a match a channel cover plate of the channel, the channel cover is formed with a hot oil guide; c. the channel cover is combined with the hot plate body and sealed by a friction stir welding method; d. after welding Shape adjustment and finished product size processing. The method for manufacturing an aluminum alloy oil hot plate according to claim 1, wherein the high thermal conductivity aluminum alloy is a 6XXX series aluminum alloy. The method for producing an aluminum alloy oil hot plate according to claim 1, wherein the non-heat treated aluminum alloy is a 5XXX series aluminum alloy. The method for manufacturing an aluminum alloy oil hot plate according to claim 1, wherein the channel cover has a "ㄇ" shape, so that the lower end of the channel cover contacts the bottom of the channel to form a support, and then The side of the channel cover is welded to the combination of the hot plate body.