Patent Name: Manufacturing Method of Spray Welding Process for Glass Mould
Technical field:
The invention relates to the field of glass mold processing, in particular to a spray welding process for seam lines, heads and necks and wiring of glass molds and a subsequent processing method.
Background art:
During the molding process of glass products, the glass mold frequently contacts the molten glass above 1 100℃, and works at high temperature for a long time, and mechanical impact and chemical reaction occur in the process of repeatedly opening and closing the mold. Usually, the seam line of the mold cavity is destroyed before it fails, which leads to the rough seam line of the produced glass products and the premature failure of the mold. In view of this situation, it is of great significance to strengthen the vulnerable parts of the mold to make full use of the mold. The important parts and vulnerable parts of the mold, such as the head and neck line, the joint surface and the bottom line, are coated with a layer of nickel-based alloy powder and metallurgically bonded with the base material. After spray welding, there are problems caused by spray welding in the subsequent mold processing. Due to the different physical properties of materials, there will be a phenomenon of "giving way to the knife" at the junction of spray welding and substrate. In this way, the articular surface, head and neck, and joints are machined into uneven surfaces. Especially in the joint surface, the quality and appearance of glass products will be seriously affected by this small "step". Therefore, it is necessary to improve the subsequent processing technology. At present, most glass mold manufacturers use manual spray welding, and the quality of spray welding is difficult to control, so the subsequent processing of spray welding inevitably appears avoidance phenomenon.
Summary of the invention
The technical problem mainly solved by the invention is to provide a spray welding treatment process for glass molds, which can not only ensure a reliable spray welding layer, but also have good economic benefits. In order to solve the above technical problems, the technical scheme adopted by the invention is as follows: providing a spray welding treatment process for a glass mold, which specifically comprises the following steps:
(100), pretreatment of spray welding position: firstly, grooves are milled at the positions needing spray welding by mechanical processing to ensure that the surface roughness of these positions needing spray welding reaches ra2512.5;
(200) Spray welding: Before spray welding, preheat the pretreated glass mold to 300℃+/-330℃, then clamp the preheated glass mold to the specified fixture, and spray weld with a plasma spray welder. Nickel-based alloy powder is used for spray welding, the current is 80A, the spray welding speed is 2.8mm/s, the powder feeding rate is 22.5 kg/h, the distance from nozzle to workpiece is d= 12mm, the swing of spray welding torch is B = 3±6mm, the ion gas flow rate is Q = 0.2±0.3m 3/min, the powder feeding gas flow rate and the shielding gas flow rate are 3-3. The welding layer moves at a uniform speed immediately after "mirror reflection";
(300), heat preservation: after the spray welding of the glass mold workpiece is completed, the glass mold workpiece after spray welding is put into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 65438+/-0.50 DEG C. When the whole mold reaches the equilibrium temperature, the mold is taken out and cooled to room temperature;
(400) Processing after spray welding: Install the glass mold on the processing center, roughly mill the plane to be processed, leaving a margin of 0.2^0.3mm, and then grind the plane to the final size with a grinding wheel. In a preferred embodiment of the present invention, the positions requiring spray welding include seam lines, head and neck, and wiring positions of the glass mold.
In a preferred embodiment of the invention, a rectangular groove with a depth of ImnTl.5mm and a width of 2.5mnT3mm is milled at the seam requiring spray welding, and a triangular groove with a length of 2mm×45 degrees is unified at the head and neck and the wiring. In a preferred embodiment of the present invention, grinding is performed using a 50-mesh CBN grinding wheel in step (400). The invention has the beneficial effects that the spray welding method and specific process of the glass mold are improved on the basis of the general process, and the traditional manual spray welding or non-spray welding of the glass mold is changed into machine spray welding, thus greatly improving the spray welding quality of products. Compared with manual spray welding, the amount of welding powder is reduced by 50%, which greatly reduces the labor intensity of workers and avoids the occupational health problems caused by long-term exposure to spray welding radiation. Compared with the traditional manual spray welding, plasma spray welding changes the original "two-step spray welding method" into one step, which improves the production efficiency. Using orthogonal design method, the orthogonal design experiment of spray welding speed, spray welding current, powder feeding amount and the distance between nozzle and workpiece was set up, and the influence of different conditions on the surface forming, quality and dilution rate of welding layer was analyzed, so as to obtain reasonable process parameters, optimize spray welding process parameters and improve product stability. In the subsequent processing, the traditional milling method is changed into grinding method, and the production efficiency is the same as that of milling, but the quality of the die mating surface is greatly improved, and the phenomenon of "giving way to the tool" will not occur again, thus completely solving the problem of uneven surface at the joint surface.
Detailed description
Hereinafter, preferred embodiments of the present invention will be described in detail, so that those skilled in the art can more easily understand the advantages and features of the present invention, and can more clearly define the protection scope of the present invention. Example 1
First, the seam line to be spray welded is milled to a depth of 1 mm1.5mm and a width of1.5mm..
2.5mnT3mm rectangular groove, 2mmX45 triangular groove in the head and neck and wiring. The roughness of these surfaces requiring spray welding shall be within the range of Ra25 12.5. Then, before spray welding, preheat the pretreated mold to 300℃+/-330℃, then clamp it to the specified fixture, and then use the plasma spray welding machine. Implement spray welding. Spray welding alloy powder adopts 2 1A PTA nickel-based alloy powder produced by WALLcolmonoy company. The control current is 80A, the spray welding speed is 2.8mm/s, the powder feeding rate is 22.5 kg/h, the distance from the nozzle to the workpiece is d= 12mm, the swing of the spray gun is B = 3±6mm, the ion gas flow rate is Q = 0.2±0.3m 3/min, the powder feeding gas flow rate and the shielding gas flow rate are 3-3.5 m3/min. Note: it is necessary to control the spray welding speed to make the welding layer produce "mirror reflection" and then move at a constant speed immediately. The die workpiece cannot be cooled at room temperature immediately after spray welding. Because the temperature of the mold just sprayed is very high, it will crack when it is cooled to room temperature immediately, and the quality of the welding layer is not reliable due to shrinkage and other problems. The workpiece after spray welding needs to be put into a holding furnace, and the temperature of the holding furnace should be controlled at 150℃. When the whole mold reaches the equilibrium temperature, the mold is taken out and air-cooled to room temperature. Install the spray welding mold to the little giant machining center. First, make a rough plane with 0.2^0.3mm allowance, and then grind the plane to the final size with a 50-mesh CBN grinding wheel. The above is only an example of the invention, and does not limit the patent scope of the invention. Any equivalent structure or equivalent technological transformation made by using the contents of the specification of the present invention, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.
claim of right
1. A spray welding process for glass molds, which is characterized by comprising: (100), pretreatment of spray welding parts: firstly, grooves are milled at the parts needing spray welding through mechanical processing to ensure that the surface roughness of these parts needing spray welding is in Ra 2512.5; (200) Spray welding: Before spray welding, preheat the pretreated glass mold to 300℃+/-330℃, then clamp the preheated glass mold to the specified fixture, and spray weld with a plasma spray welder. The spray welding alloy powder is nickel-based alloy powder, the control current is 80A, the spray welding speed is 2.8mm/s, the powder feed rate is 22.5 kg/h, the spray gun swings B = 3±6mm, the ion gas flow rate Q = 0.2±0.3m 3/min, the powder gas flow rate and the shielding gas flow rate are 3 ~ 3.5 m3/min; The welding layer moves at a uniform speed immediately after "mirror reflection"; (300), heat preservation: after the spray welding of the glass mold workpiece is completed, the glass mold workpiece after spray welding is put into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 65438+/-0.50 DEG C. When the whole mold reaches the equilibrium temperature, the mold is taken out and cooled to room temperature; (400) Processing after spray welding: Install the glass mold on the processing center, roughly mill the plane to be processed, leaving a margin of 0.2^0.3mm, and then grind the plane to the final size with a grinding wheel.
2. The spray welding process of the glass mold according to claim 1, characterized in that the parts needing spray welding include the seam line, the head and neck and the wiring place of the glass mold.
3. The spray welding process of the glass mold according to claim 2, characterized in that a rectangular groove with a depth of 1.5 mm and a width of 2.5 mm is uniformly opened at the seam to be spray welded, and a triangular groove with a length of 2 mm× 45 mm is uniformly opened at the head and neck and the wiring.
4. The spray welding process of the glass mold according to claim 1, characterized in that in step (400), a 50-mesh CBN grinding wheel is used for grinding.
Full text abstract
The invention disclose a spray welding proces for a glass mold, which comprises that following specific steps: machine pretreatment before spray welding, preheating before spray welding, spray welding by a plasma spray welding machine, heat treatment and further machining. The spray welding process of glass mold can not only ensure reliable spray welding layer, but also have good economic benefits; Moreover, in the subsequent processing, the traditional milling method is changed into grinding method to deal with the spray welding position, and the production efficiency is equivalent to that of milling, but the quality of the die mating surface is greatly improved, and the phenomenon of "giving way to the tool" will not occur again, thus completely solving the problem of uneven surface at the joint surface.
The file number is b23k10/02gk10312158sq2013100681.
Publication date: 2065438+May 29th, 2003, application date: 2065438+March 5th, 2003, priority date: 2065438+March 5th, 2003.
Inventors Tang Jianfeng, Qian Jian and Yan Qian.