Defect repairing method for upper mold of high temperature superplastic molding mold
A superplastic molding and defect repairing technology, which is applied in the field of defect repairing of upper molds of high-temperature superplastic molding molds, can solve problems such as weak connection between surfacing welding and inserts, and unusable molds, so as to achieve good processing operability and low price. Effect of low cost and good mechanical properties
Active Publication Date: 2018-04-13
SHENYANG AIRCRAFT CORP
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Problems solved by technology
[0002] In the past, surfacing welding and insert technology were usually used to repair the upper mold of the mold; however, when the high-temperature superplastic molding mold is used, it is heated to a high temperature in the superplastic molding machine, which will cause the surfacing welding and the insert to be not firmly connected and fall off. Technical issues that render the mold unusable
Method used
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Embodiment Construction
[0019] Use the 5-coordinate CNC machining center to drill the defect position of the superplastic forming upper mold body 1, and mill it to generate and fill the inverted tapered cavity 2, and the surface roughness of the cavity is 3.2, as shown in Fig. figure 1 shown.
[0020] The composite welding filler is filled in the inverted conical cavity 2, filled and overflowed, and the overflowed composite welding filler is higher than the surface to be repaired of the high-temperature superplastic mold.
[0021] Fix the silicon powder with a small ring 3 that is larger than the filling port, and press static pressure to form a stacking margin at the filling port of the inverted cone cavity.
[0022] The superplastic molding upper mold and lower mold are sent into the superplastic molding machine, and nitrogen gas is passed through the vent hole 4 to clean the inner cavity of the mold, acting as a protective gas and a reactive gas, and avoiding the oxidation of the composite welding...
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The invention relates to a defect repair method of an upper mold body of a high-temperature super-plastic forming mold. The defect repair method comprises the steps that an inverted-cone cavity is machined in the proper position of the to-be-repaired surface of the upper mold body; the inverted-cone cavity is filled with a silica powder containing hybrid welding filling agent till the hybrid welding filling agent overflows out of the surface of the super-plastic forming mold; the hybrid welding filling agent in the cavity is compacted through a static pressure method to form a hardened blank; the upper mold body and a lower mold body are compounded to be conveyed into a super-plastic forming machine to be heated, nitrogen is introduced all the time in the heating process, and the hybrid welding filling agent is prevented from being oxidized; when the furnace temperature rises to 1,100 DEG C or above, the nitrogen and silica powder in the hybrid welding filling agent generate a sintering chemical reaction to generate silicon nitride ceramic, the furnace temperature is controlled, and the process lasts for 48 hours till a pre-sintering reaction finishes; and mold standing is carried out till the temperature reaches the room temperature, a cured tight-junction blank is formed by the silicon nitride ceramic formed by sintering of the hybrid welding filling agent and the super-plastic forming mold, and the sintered high-temperature super-plastic forming mold is conveyed to a numerical control machining center to be machined to be qualified. According to the method, the inverted-cone cavity is utilized, and the mold is quite firm after being repaired.
Description
technical field [0001] The invention relates to a method for repairing defects of an upper mold of a high-temperature superplastic molding mold, which solves the problem that the mold cannot be repaired and the mold is scrapped and cannot be used in the existing stage. Background technique [0002] In the past, surfacing welding and insert technology were usually used to repair the upper mold of the mold; however, when the high-temperature superplastic molding mold is used, it is heated to a high temperature in the superplastic molding machine, which will cause the surfacing welding and the insert to be not firmly connected and fall off. Technical problems that render the mold unusable. Contents of the invention [0003] The purpose of the present invention is to provide a repair method suitable for high-temperature superplastic molding molds, which is an effective technology when surface quality problems such as trachoma, scratches, wear, and fatigue phenotypes appear in ...
Claims
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IPC IPC(8): B23P6/00B23P15/24
CPCB23P6/00B23P15/24
Inventor 孙勇飞吴兆强
Owner SHENYANG AIRCRAFT CORP