Control device and method for morphic gradient of ultrahigh-strength steel

A technology of ultra-high-strength steel and control devices, which is applied in the field of hot stamping and forming, can solve problems such as gradient changes in shape, achieve the effects of reducing surface oxidation, meeting lightweight requirements, and improving forming efficiency and quality

Pending Publication Date: 2020-04-28
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a shape gradient control device and method for ultra-high strength steel, which solves the technical problem of shape gradient change in hot stamping technology

Method used

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  • Control device and method for morphic gradient of ultrahigh-strength steel
  • Control device and method for morphic gradient of ultrahigh-strength steel
  • Control device and method for morphic gradient of ultrahigh-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the embodiment of the present invention provides a shape gradient control device for ultra-high-strength steel, including a transmission frame 3, and transmission rollers are arranged at intervals along the length direction of the transmission frame 3, and the plate to be processed can move on the transmission frame 3 . A first heating furnace 4 , a rolling device 5 and a second heating furnace 6 are sequentially arranged on the transmission frame 3 from the input end to the output end, and the output end of the transmission frame 3 is connected to the stamping device 8 through the side roller track 7 . The first heating furnace 4 is used for preheating the ultra-high-strength steel plate 1; the rolling device 5 is used for rolling the preheated plate on-line with variable thickness; the second heating furnace 6 is used for rolling the rolled plate Stress relief during tentenitization and synchronous shaping; the stamping device 8 is used for...

Embodiment 2

[0036]Based on the same inventive concept as that of Embodiment 1, an embodiment of the present invention provides a method for controlling the shape gradient of ultra-high-strength steel, including the following steps:

[0037] Move the blanked ultra-high-strength steel plate to the first heating furnace, and preheat it under the protection of nitrogen. The heating temperature is 720-760 ° C, and keep it for a period of time; the holding time is t, t=d×n; In the formula: d is the thickness of the plate, the unit is mm; the unit of t is s; n is a constant, and the value of n is 60-65.

[0038] The preheated ultra-high-strength steel plate is moved out of the first heating furnace, and rolled on-line, so that the thickness of the ultra-high-strength steel plate has a gradient.

[0039] Move the rolled ultra-high-strength steel plate to the second heating furnace, continue heating under the protection of nitrogen, the heating temperature is 910-940 ° C, and keep it for a period ...

Embodiment 3

[0042] An embodiment of the present invention provides a method for controlling the shape gradient of ultra-high-strength steel, which specifically includes the following steps:

[0043] 1) Preheating: move the blanked ultra-high-strength steel plate to the first heating furnace, preheat to 720-760°C under the protection of nitrogen; keep it warm for a period of time, t=d×n; where: d is the thickness of the plate, the unit is mm; the unit of t is s; n is a constant, and the value of n is 60~65.

[0044] 2) On-line rolling with variable thickness: the ultra-high-strength steel sheet is moved out of the first heating furnace through the conveying roller, and rolled on-line to make the thickness gradient; the deformation of some areas of the online rolling with variable thickness is controlled at 30% to 50%, while the thinning area does not exceed 30%.

[0045] 3) Austenitization and simultaneous shaping and stress relief: move the rolled ultra-high-strength steel plate to the s...

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Abstract

The invention discloses a control device for morphic gradient of ultrahigh-strength steel. The device comprises a conveying frame, a first heating furnace, a rolling device and a second heating furnace are sequentially mounted on the conveying frame from input end to output end, the output end of the conveying frame is connected with a stamping device, the stamping device comprises an upper male die and a lower female die which are matched, a telescopic device is mounted on the side faces, facing to each other, of the lower female die, the output end of the telescopic device is connected witha side roller rail, multiple cooling water ways are evenly mounted in the upper male die and the lower female die, each cooling water way is independently controlled, and temperature of each cooling water way is monitored by a thermocouple. The invention further discloses a control method for the morphic gradient of the ultrahigh-strength steel. The method comprises following steps of preheating,variable-thickness online rolling, austenitizing and synchronous setting stress removal, hot stamping, and partition quenching. According to the device and method, synchronous control over rigidity, strength and toughness gradient of ultra-high strength steel plates can be effectively achieved, the morphic gradient of the steel plates can be achieved, and light weight is achieved while the rigidity design needs are ensured.

Description

technical field [0001] The invention belongs to the technical field of hot stamping, and in particular relates to a shape gradient control device and method for ultra-high-strength steel. Background technique [0002] The automobile industry is one of the five pillar industries of my country's national economy and the largest carrier of high-tech. Under the premise of ensuring safety performance, by introducing lightweight material structural parts into the body, the weight of the body can be reduced, the fuel rate can be improved, and the maintenance cost of the vehicle can be reduced. [0003] Ultra-high-strength steel is a kind of steel with ultra-high tensile strength (above 1380Mpa) and martensitic structure. Because of its low cost, high tensile strength and obvious weight reduction benefits, it has become more and more popular in the automotive industry in recent years. of favor. Ultra-high-strength steel plates are generally manufactured by hot forming technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B45/00B21D37/16B21D37/10B21D37/12B21C51/00B21D43/08B21B37/74B21B37/00C21D1/74C21D1/18
CPCB21B37/00B21B37/74B21B45/004B21B2045/006B21B2261/046B21C37/02B21C51/00B21D37/10B21D37/12B21D37/16B21D43/08C21D1/18C21D1/74
Inventor 巴志新章月李华冠王章忠张保森李琦赵海旦刘永刚崔磊刘朗峰董继武毛向阳巨佳
Owner NANJING INST OF TECH
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