Die forming method for forming female screw
AssigneeDenso Corporation
InventorsHideyuki Suzuki, Hisashi Kayano, Koichiro Sato
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Abstract
A molten magnesium material is filled into a product section of a die. The molten magnesium material is cooled and solidified in the die, so that a molded product is formed. Subsequently, a thread-shaped pin is rotated, so that a female-thread forming section is drawn from the female-thread section of the molded product while the female-thread forming section is rotated. Thus, the female-thread section can be formed when the molded product is formed. A magnesium-alloy material is not apt to stick to a steel material used in the die compared with an aluminum-alloy material, so that the female-thread section can be steadily formed.
Claims16
A die forming method for forming a molded product having a female-thread section comprising:
- a filling process in which a fluidic material is filled into a die including a core pin having a screw-shaped portion, which is made of a steel material, shaped in correspondence with the female-thread section;
- a solidification process in which the fluidic material filled in the filling process is cooled and solidified to form the molded product;
- and
- a thread-drawing process in which the screw-shaped portion of the core pin is drawn while being rotated from the molded product after the solidification process,
- wherein the fluidic material filled in the filling process is a magnesium-alloy material,
- wherein a plurality of molded products are formed over a plurality of times;
- and
- wherein a temperature of the core pin is adjusted to be at a substantially same pre-heating temperature when the thread-drawing process is performed for the plurality of times.
A die forming method for forming a molded product having a female-thread section, the die forming method comprising:
- filling a fluidic material into a die in a filling process, the die including a core pin having a screw-shaped portion;
- cooling and solidifying the fluidic material filled in the filling process to form the molded product in a solidification process;
- and
- drawing the screw-shaped portion of the core pin while being rotated from the molded product in a thread-drawing process,
- wherein:
- a temperature of the core pin is adjusted at a predetermined pre-heated temperature in at least a beginning of the thread-drawing process;
- and
- the predetermined temperature of the core pin is substantially same for a plurality of times of forming a respective plurality of molded products.
A die forming method for forming a molded product having a female-thread section, the die forming method comprising:
- lubricating a core pin in a lubricating process;
- applying lubricant over a female-thread forming section in the lubricating process;
- filling a fluidic material into a die in a filling process, the die including a core pin having a screw-shaped portion;
- cooling and solidifying the fluidic material filled in the filling process to form the molded product in a solidification process;
- and
- drawing the screw-shaped portion of the core pin while being rotated from the molded product in a thread-drawing process,
- wherein:
- the core pin and the female-thread forming section are cooled, so that a temperature of the core pin and the female-thread forming section becomes below 300° C. in the lubricating process.
Dependencies are inferred from the claim text.