A method for surface modification of hot work die steel materials based on cim process

A technology for surface modification of hot work die steel, applied in the field of surface modification of hot work die steel materials, can solve the problems of high cost, short service life, low bonding strength, etc., achieve low production cost, improve service life, and solve service life low effect

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low bonding strength in the ceramic / hot work die steel composite mold prepared by using the method for surface modification of the existing hot work die steel material, and it is not suitable for melting or semi-solid metal to the mold in the extrusion casting process. Long-term continuous thermal shock and thermal corrosion, short service life and high cost problems, and provide a method for surface modification of hot work die steel materials based on CIM process

Method used

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  • A method for surface modification of hot work die steel materials based on cim process
  • A method for surface modification of hot work die steel materials based on cim process

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specific Embodiment approach 1

[0032] Embodiment 1: This embodiment is a method for surface modification of hot work die steel materials based on CIM technology, which is specifically completed according to the following steps:

[0033] 1. For Y 2 o 3 Stabilized zirconia powders were modified: the Y 2 o 3 The stable zirconia powder is sintered at a temperature of 900°C to 1100°C for 1h to 2h, and then cooled to room temperature with the furnace, and then to Y 2 o 3 Add modifiers and grinding aids to the stable zirconia powder, then use zirconia ceramic balls to perform wet ball milling for 20h-24h, then dry at a temperature of 40°C-60°C for 8h-10h, and then sieve to obtain Modified Y with a particle size of 0.8 μm to 1.0 μm 2 o 3 Stabilized zirconia powder;

[0034] The zirconia ceramic ball and Y described in step one 2 o 3 The mass ratio of stable zirconia powder is 4:1;

[0035] Y as described in Step 1 2 o 3 The mass ratio of stable zirconia powder to grinding aid is 1:1;

[0036] Y as desc...

specific Embodiment approach 2

[0055] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the hot work die steel material in step 3 is 5CrNiMo, 5CrNiTi, 5CrMnMoSiV, 4CrW2Si, 4Cr5MoSiV1 or 3Cr2W8V. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0056] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the modifying agent described in step 1 is stearic acid. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a CIM (Computer Integrated Manufacturing)-process-based hot-work die steel material surface modification method, relates to a hot-work die steel material surface modification method, and aims to solve the problem that a ceramic / hot-work die steel composite die prepared by a conventional hot-work die steel material surface modification method is low in bonding strength, maladaptive to the long-time continuous thermal shock and thermal corrosion of molten or semi-solid metal to the die in an extrusion casting process, short in service life and high in cost. The method comprises the following steps of 1, modifying Y2O3-stable zirconium oxide powder; 2, performing mixing; 3, performing injection molding; 4, performing degreasing and sintering to obtain a zirconium oxide ceramic / hot-work die steel composite die. The thickness of zirconium oxide ceramic in the obtained zirconium oxide ceramic / hot-work die steel composite die is 10 to 15mm, and the shear strength of the connection interface can reach 68 to 70MPa. The CIM-process-based hot-work die steel material surface modification method can be implemented.

Description

technical field [0001] The invention relates to a method for modifying the surface of a hot work die steel material. Background technique [0002] Squeeze casting (liquid die forging) is a metal forming technology between casting and die forging. Compared with casting, it effectively avoids shrinkage cavity and porosity of the parts, refines the grains and improves the strength; compared with die forging, it saves the forming process and forming pressure (about 1 / 5-1 of the die forging force) / 3), and the performance is close to the index of forgings; there is no forging flash and casting riser, and the material utilization rate is high. Squeeze casting technology is an advanced manufacturing technology that saves labor, energy and materials. It is currently widely used in automobile manufacturing, aerospace, hardware construction and other industries. Although domestic squeeze casting forming technology has made great progress in recent years, there is still a gap between...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/02C04B35/48C04B35/622
Inventor 杜之明孙永根秦晋柳君金瑜辉
Owner HARBIN INST OF TECH
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