Preparation method for semi-solid state blank of steel

A semi-solid and billet technology, which is applied in the field of semi-solid billet preparation, can solve the problems of low spheroidization rate of semi-solid billet structure, difficulty in semi-solid billet preparation, and uneven grain size, so as to save the secondary heating process, The effect of low cost and reasonable solid phase fraction

Inactive Publication Date: 2017-02-22
XIANGTAN UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] When conventional methods such as upsetting and extrusion prepare semi-solid billets, there are disadvantages such as small deformation and uneven deformation, which finally lead to low spheroidization rate and uneven grain size of the prepared semi-solid billet.
New methods such as equal-diameter angular extrusion and die forging have a large amount of deformation, but need to manufacture molds, which increases the cost and requires high equipment requirements; and is mostly used for the preparation of semi-solid billets of low-melting point alloys such as aluminum and magnesium.
However, for high melting point alloy materials such as steel, the preparation of its semi-solid blank will be more difficult

Method used

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  • Preparation method for semi-solid state blank of steel
  • Preparation method for semi-solid state blank of steel

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the present embodiment takes 100Cr6 bearing steel as an example, and the preparation method of its semi-solid billet is as follows:

[0028] (1) The forging temperature range of 100Cr6 bearing steel obtained by searching the literature is 800°C~1100°C; the solid phase temperature point is 1307°C, and the liquid phase temperature point is 1491°C.

[0029] (2) Heat the high-temperature resistance furnace to the initial forging temperature of 1100°C, and then cut the 100Cr6 bearing steel billet that has been precisely cut by wire cutting. The billet size is Φ50mm×90mm, and put it into the high-temperature resistance furnace for heat preservation. About 30min.

[0030] (3) Clamp the 100Cr6 bearing steel treated in step 2 to the lower cutting board of a 400 kg air hammer, and use the wide flat anvil upsetting method with a forging ratio of 2.3 to upset the billet, and the final forging temperature is 800 °C.

[0031] (4) After the upsetting is co...

Embodiment 2

[0036] Present embodiment adopts 60Si2Mn spring steel as example, and the preparation method of its semi-solid blank is as follows:

[0037] (1) The forging temperature range of 60Si2Mn spring steel obtained by searching the literature is 850°C~1200°C; the solid phase temperature point is 1410°C, and the liquid phase temperature point is 1480°C.

[0038] (2) Heat the high-temperature resistance furnace to the initial forging temperature of 1200°C, and then cut the precisely blanked billet by wire cutting. The billet size is Φ50mm×90mm, put it into the high-temperature resistance furnace, and keep it warm for about 30 minutes.

[0039] (3) Clamp the 60Si2Mn spring steel treated in step 2 to the lower cutting board of a 400 kg air hammer, use the wide flat anvil upsetting method, the forging ratio is 2, upsetting the billet, and the final forging temperature is 850 °C.

[0040] (4) After the upsetting is completed, the billet is elongated and forged to return to the original bil...

Embodiment 3

[0044] This embodiment takes X210CrW12 tool steel as an example, and the preparation method of its semi-solid blank is as follows:

[0045] (1) The forging temperature range of X210CrW12 tool steel obtained by searching the literature is 850°C~1150°C; the solid phase temperature point is 1200°C, and the liquid phase temperature point is 1400°C.

[0046] (2) Heat the high-temperature resistance furnace to the initial forging temperature of 1150°C, and then cut the precisely blanked blank by wire cutting method. The blank size is Φ50mm×90mm, put it into the high-temperature resistance furnace, and keep it warm for about 30 minutes.

[0047] (3) Clamp the X210CrW12 tool steel treated in step 2 to the lower cutting board of a 400 kg air hammer, use the wide flat anvil upsetting method, the forging ratio is 2, and the billet is upset, and the final forging temperature is 850 °C.

[0048] (4) After the upsetting is completed, the billet is elongated and forged to return to the origi...

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Abstract

The invention discloses a preparation method for semi-solid state blank of steel. The preparation method comprises the following steps of: 1) heating a high-temperature resistance furnace to 1100-1200 DEG C, and putting blank which precisely drops into the high-temperature resistance furnace to heat and preserve heat; 2) clamping blank onto a lower cutting board of a forging hammer, upsetting in the axial direction of the blank for enabling the blank to reach set deformation amount; 3) after upsetting, drawing the blank to the initial size; 4) repeating steps 2) and 3) within the range of a forging temperature, quickly cooling the blank to the room temperature; and 5) rising the furnace temperature of the high-temperature resistance furnace to a semi-solid state temperature being 1250-1450 DEG C of steel, and putting the blank to heat and perverse heat, thereby obtaining semi-solid state blank of steel. Semi-solid state blank prepared by the preparation method can be directly subjected to semi-solid state forging formation, so that a secondary heating process is avoided, a blank making mould does not need to manufacture, process flow is shortened, operations are simple, efficiency is high and cost is high.

Description

technical field [0001] The invention relates to a method for preparing a semi-solid blank of steel, belonging to the field of semi-solid blank preparation. Background technique [0002] In the 1970s, Flemings et al. proposed the metal semi-solid forming technology (Semi-Solid Mental Forming Processes, SSM). Compared with the conventional metal forming process, metal semi-solid forming has many advantages. It can be formed at a higher speed to obtain complex metal parts with good internal structure and high dimensional accuracy. It is called by experts as one of the key technologies for emerging metal manufacturing in the 21st century. 1. The preparation of a semi-solid billet with a uniform and fine equiaxed non-dendritic structure, a high solid phase ratio (easy to clamp), and a relatively low shear flow stress (easy to fill) is a metal semi-solid The basis and key of thixoforming is also an important subject in the research field of semi-solid forming. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D1/18B21J1/02
CPCB21J1/025C21D1/18C21D8/005
Inventor 肖良红李建文马帅李晓东郑文樊星
Owner XIANGTAN UNIV
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