Carburizing and carbonitriding combined heat treatment method for hot forging marking die steel
A composite heat treatment, carbonitriding technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of reducing the life of the die, affecting the production efficiency of forgings, poor structure, etc., to improve the impact load High temperature friction and wear ability, saving mold consumption cost and reducing mold cost effect
Inactive Publication Date: 2016-02-24
SHAANXI DONGMING VEHICLE SYST
View PDF5 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the temperature of conventional carburizing and carbonitriding technology is controlled at 820-930°C, and the carbon concentration in the atmosphere is Cp=0.8-1.3%. It is difficult to apply to hot work die steel, and it is easy to produce bad structures and reduce the life of the die.
[0004] Hot work die steel includes three types: hot forging die, hot extrusion die and hot casting die. The marking die belongs to hot extrusion die, and it serves under heavy load (2000KN) and high temperature friction and wear conditions. Broken, hot work die steel with superior performance is selected, the die life is 200-500 pieces, the die consumption cost is 3-6 yuan / piece, accounting for 1.3-2.7% of the part manufacturing cost, and seriously affects the production efficiency of forgings, and the manufacturing cost of forgings is relatively high. high
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] The embodiment of the present invention provides a carburizing carbonitriding compound heat treatment method for hot forging mark die steel, the method is realized through the following steps:
[0024] (1) Material selection and processing of the logo mold insert: process the φ80mm specification Unimax material bar into the finished logo mold insert;
[0025] Specifically, the Unimax material is a chrome-molybdenum-vanadium alloy tool steel, which has the following characteristics: excellent toughness and plasticity in all directions, excellent polishability, good wear resistance, good dimen...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a carburizing and carbonitriding combined heat treatment method for hot forging marking die steel. The method is realized through the following steps: material selection and processing for a marking die insert; tempering and preparation of heat treatment; and carburizing and carbonitriding combined heat treatment. By adopting the method, the surface hardness of a die is increased to 60-65 HRC; the core hardness is increased to 50-55 HRC; the thickness of a cementation layer reaches 0.6-0.8 mm; the heavy load bearing performance and impulse load bearing performance of the die are also greatly improved; high-temperature friction and wear resistance of the die is greatly improved; the service life of the rotary forging marking die is further increased by 3 to 6 times; and the cost of the die is reduced by 80% or more.
Description
technical field [0001] The invention relates to the field of chemical strengthening heat treatment on the surface of metal materials, in particular to a carburizing carbonitriding composite heat treatment method for hot forging marking die steel. Background technique [0002] Carburizing and carbonitriding are currently widely used chemical heat treatment methods in the machinery manufacturing industry. They have the advantages of high surface hardness, wear resistance, good toughness, and moderate hardness from the surface to the substrate. They can withstand impact loads and Serving under fatigue conditions, it is widely used in gears, bearings, ring rings and other fields, which significantly improves the service life of parts. [0003] The current carburizing and carbonitriding technologies are mostly used for carburizing steels with low carbon content (for example: 16MnCr5, 20MnCr5, 19CrNi3, 20, 20Cr, 20CrMo, 22CrMoH, 20CrMnTi, 8620H, 17CrNiMo6, 20Cr2Ni4, etc.), the car...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/34C23C8/02C21D1/18
CPCC21D1/18C23C8/02C23C8/34
Inventor 严超峰张海伟付海山李栋白培静谢余
Owner SHAANXI DONGMING VEHICLE SYST