Temperature difference forming device and temperature difference forming method of automobile nut plate parts

Abstract

The invention provides a temperature difference forming device of automobile nut plate parts. The forming device comprises a pressing machine and a die. The die comprises a male die, a side pressing ring and a female die. The male die is connected onto a lower die seat of the pressing machine, a discharging screw penetrates through a hole on a male die base and the side pressing ring to be connected with top threads, and the female die and an upper cushion plate are connected onto an upper die seat of the pressing machine through a screw. The temperature difference forming device is characterized in that a heating device is arranged on the periphery of the side pressing ring and the female die, and a ventilation runner is arranged at the center of the male die. Temperature difference is formed by heating the side pressing ring and the female die and cooling the male die to enable parts of blank materials to be in temperature distribution favorable for stretching. The temperature difference forming device utilizes the proper heat transfer mode to enable the parts of the blank materials to be located in temperature distribution favorable for stretching, completely utilizes mechanical performance of automobile steel, improves the forming process in the stretching limit and reduces stretching times in nut plate formation accordingly.

Description

technical field [0001] The invention relates to the technical field of automobile mold manufacturing, in particular to a temperature difference forming device and a forming method for automobile nut plate parts. Background technique [0002] Currently the most common manufacturing method for nut plates for automobiles is to connect the nuts to the mother plate by riveting or welding. However, the connection between the nut and the motherboard is subject to fatigue load and vibration during the running of the car, which can easily lead to the loosening and failure of the two parts, which will lead to potential safety hazards. Later, someone invented a nut plate with an integrated structure of the nut and the mother plate. The initial blank is a medium-thick plate with a thickness of more than 2mm. Considering the size of the thread structure, the ratio of the wall thickness of the nut to the thickness of the mother plate should be greater than 1.2. The method of upsetting af...

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Problems solved by technology

The disadvantages of this invention: (1) The heating temperature of the die and blank holder is between 200°C and 250°C, which is only limited to magnesium alloy plates as the forming material, but for the temperature difference deep drawing of ordinary automobile steel used in large quantities Heating temperature is not involved

(2) Magnesium alloy plates are mostly used to form large and thin structural parts. The thickness of the magnesium alloy plates used above is 0.8mm, which belongs to thin plates. Compared with medium and thick plates, it is easier to wrinkle and lose stability in the thickness direction during deep drawing However, in the above-mentioned invention, the method of changing the blank-holding force from large to small during the forming process is adopted to solve wrinkling, which requires high forming equipment and is difficult to control accurately. Forming Problems of Medium and Heavy Plates

(3) The 8 heating holes distributed radially in the die and blank holder ring are heated by built-in heating rods. The temperature near the vertical surface of the heating rod is likely to be higher than that of the vertical surface without heating rods on the circumferential surface of the die and blank holder ring. As a result, uneven temperature occurs along the circumferential direction, which intensifies the occurrence of wrinkling in the thickness direction of the sheet

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