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Preheating heat preservation device for laser additive manufacturing

A heat preservation device and laser additive technology, which is applied in the direction of additive manufacturing, additive processing, metal material coating technology, etc., can solve the problems that it is difficult to ensure the temperature stability of the melting zone, and it is difficult to form a molten pool, so as to improve the hardness and prevent cracks and porosity, good quality effect

Active Publication Date: 2021-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in terms of copper alloys, because copper has high reflectivity to laser light and good thermal conductivity, it is difficult to ensure the temperature stability of the melting zone when laser additives are added on the surface of copper alloys: in the application of high-speed laser additives on the surface of copper alloys, there are still The problem of poor formation of molten pool caused by copper's high reflectivity to laser light and good thermal conductivity

Method used

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  • Preheating heat preservation device for laser additive manufacturing
  • Preheating heat preservation device for laser additive manufacturing
  • Preheating heat preservation device for laser additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0096] 1. The laser cladding device used in Examples 1-3 is the ZKZM-4000 laser cladding product produced by Xi'an Zhongke Zhongmei Co., Ltd., including optically coupled semiconductor lasers, chillers, cladding heads, powder feeders and other components . The formulation of the laser cladding powder used is shown in Table 1 below (mass percentage):

[0097] Table 1

[0098]

[0099]

[0100] The particle size range of the alloy material powder is 25-150 μm, and the sphericity is ≥80%.

[0101] 2. Pretreatment of copper-based workpieces

[0102] Polish the surface of the pure copper workpiece with a grinder and sandpaper to remove the surface oxide layer; and clean the surface of the pure copper workpiece with absolute alcohol or acetone to obtain a clean surface of the pure copper workpiece;

[0103] 3. Pretreatment of cladding alloy powder

[0104] The laser cladding powder needs to be dried before cladding, the drying temperature is 80-100°C, and the drying time i...

Embodiment 4-6

[0127] In order to verify the influence of the cladding head working angle on the cladding effect after powder feeding in the center, the cladding head working angle was changed, other conditions were the same as in Example 1, and the cladding results obtained by comparing different working angles were shown in Table 6 below. , corresponding to metallographic results such as Figure 7 shown.

[0128] Table 6

[0129] Example 4 Example 1 Example 5 Example 6 working angle 90 75 60 45 Cladding quality There are a few pores No pores and no cracks There are a few cracks cracked

Embodiment 7

[0131] This embodiment adopts a kind of laser cladding manufacturing preheating insulation device, which consists of such as image 3 , 4 The components shown in combination form a figure 1 , 2 style shown.

[0132] The preheating and heat preservation device is set on the cladding workbench of laser material addition. The preheating and heat preservation device has a heat preservation chamber, and a heating temperature control unit and a workpiece clamping unit are arranged in the heat preservation chamber. The top of the heat preservation chamber is opened to allow the laser to act on the On the additive material, a cover is provided at the opening. During laser work, the cover is open. When the laser operation is completed and heat preservation is required, the cover is closed.

[0133] The preheating and heat preservation device includes a heating temperature control unit, a copper-based workpiece clamping platform, an upper tank body, a lower tank body and thermal in...

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Abstract

The invention discloses a preheating heat preservation device for laser additive manufacturing which is arranged on a cladding workbench of a laser additive. The preheating heat preservation device isprovided with a heat preservation cavity, wherein a heating temperature control unit and a workpiece clamping unit are arranged in the heat preservation cavity, an opening is formed in the top of theheat preservation cavity to allow laser to act on the additive material, and a cover is arranged at the opening. The preheating heat preservation device has the advantages that the blank of the preheating and heat preservation integrated equipment for experiments in the field of laser additive manufacturing research is filled up, an equipment solution is provided for controlling the key process of the working temperature in the laser additive manufacturing technology, and a foundation is laid for promoting research progress.

Description

technical field [0001] The invention specifically relates to a preheating and heat preservation device for laser additive manufacturing. Background technique [0002] As one of the earliest metal materials used by human beings, copper is the second largest non-ferrous metal in the world. It has high electrical conductivity, high thermal conductivity, high corrosion resistance, easy processing and good mechanical properties. Therefore, copper and copper alloys are used It is widely used in machinery manufacturing, transportation, construction, electrical, electronics and other industrial sectors, and made into various electronic materials and structural components. It is the key to the power industry, electronic information industry, aerospace, marine engineering, automobile industry and military industry. Materials are also important basic materials for the development of national economy and science and technology. The biggest feature of copper is its high electrical condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F12/13B22F12/17B22F12/30B22F10/28B22F10/85C23C24/10C22C19/05C22C9/06C22C30/02B33Y70/00B33Y40/10B33Y50/02
CPCC23C24/103C22C19/058C22C19/002C22C9/06C22C30/02B33Y70/00B33Y40/10B33Y50/02
Inventor 高铭余王宏涛谢宏斌方攸同刘嘉斌
Owner ZHEJIANG UNIV
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