Laser additive manufacturing temperature measuring device

Abstract

The utility model belongs to the technical field of laser additive manufacturing, and particularly relates to a laser additive manufacturing temperature measuring device which comprises a copper mold groove. The copper mold groove comprises a copper base block and a metal block, the metal block is arranged in a regular hole body of the copper base block, and the surface of the metal block is flush with the surface of the copper base block. According to the device, when metal blocks with different melting points in a copper mold groove are beaten by laser, the temperature range under the action of the laser can be quickly, conveniently and accurately estimated at low cost by observing the melting state of the metal blocks, then temperature process parameters in laser additive manufacturing are controlled, and the forming quality of laser additive manufacturing is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laser additive manufacturing technical field, concretely relates to a laser additive manufacturing temperature measuring device. BACKGROUND

[0002] Laser metal material processing technology is one of the fastest growing technologies in the 21st century, including laser additive manufacturing and laser surface heat treatment. Compared with traditional manufacturing technology, laser metal material processing technology has the advantages of low dilution rate, small deformation, small heat-affected zone, local processing and high forming quality, among which laser additive manufacturing, also known as 3D printing technology, can realize moldless forming and manufacturing of complex parts, and can also deposit a layer of coating with special performance in the local selected part of the part. This technology has unique advantages such as short manufacturing cycle, high material utilization rate and good process flexibility, and has an important impact on manufacturing industry, and has a wide and important application in many fields such as industrial production, aerospace, medical treatment and so on.

[0003] Laser additive manufacturing is a complex process, which involves multiple process parameters and state parameters, and there are more unstable factors affecting the forming quality. For example, as the processing process proceeds, the change of heat transfer condition and the accumulation of heat cause the increase of molten pool temperature, which causes the change of temperature gradient and cooling rate, and affects the size and uniformity of the formed part. In order to realize high-quality production, it is necessary to measure and control the temperature in the laser environment. In the prior art, the common temperature measuring means has certain limitations in the scene of laser additive manufacturing. The traditional sensor temperature measuring method may cause damage to the sensor in the high temperature environment of laser, and the installation of the sensor will occupy the valuable space inside the equipment and affect the layout of the manufacturing process. Although the infrared temperature measuring method is widely used, the surface reflection, absorption characteristics of complex materials and the plasma generated by the interaction of laser and them make it difficult to accurately obtain effective temperature data. In addition, when the temperature range of laser needs to be quickly and simply estimated in the scene of laser additive manufacturing, the common temperature measuring method has high equipment cost, complex operation, and is heavy and uneconomical, which is difficult to meet the demand of rapid temperature detection in actual production. UTILITY MODEL CONTENT

[0004] In view of the problems in the prior art, the purpose of the utility model is to provide a laser additive manufacturing temperature measuring device, which can quickly, conveniently and accurately estimate the temperature range under the action of laser in the process of laser additive manufacturing, and then control the temperature process parameters and improve the forming quality of laser additive manufacturing.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A kind of laser additive manufacturing temperature measuring device, including copper mould groove.The copper mould groove includes copper base block and several metal blocks of different melting points, the top of the copper base block is equipped with multiple regular holes, the metal block is correspondingly arranged in the regular hole of the copper base block, and the upper surface of the metal block is flush with the upper surface of the copper base block.

[0007] Further, the metal block uses pure metal block or alloy block, and the metal block is placed in the regular hole of the copper base block in order from high to low melting point.

[0008] Further, the multiple regular holes are arranged in a rectangular array.

[0009] The laser additive manufacturing temperature measuring device described above includes a copper mould groove, wherein the copper mould groove includes a copper base block and several metal blocks of different melting points, the metal blocks are correspondingly arranged in the regular holes of the copper base block, and the upper surfaces of the metal blocks are flush with the upper surface of the copper base block. A specific laser is sequentially hit onto the surfaces of the metal blocks of different melting points, and whether the melting phenomenon occurs on the surfaces of the metal blocks is observed. Thus, it can be determined that the temperature under the action of the laser is between the melting points of the metal blocks that have not melted and the metal blocks that have melted. Therefore, the temperature range under the action of the laser is measured.

[0010] Compared with the prior art, the laser additive manufacturing temperature measuring device has the following beneficial effects:

[0011] The laser additive manufacturing temperature measuring device can accurately estimate the temperature range under the action of the laser by observing the melting state of the metal blocks when the laser hits the metal blocks of different melting points in the copper mould groove.

[0012] (1) The laser additive manufacturing temperature measuring device has a simple structure, only needs a copper base block and metal blocks of different melting points to be combined, and the laser is hit in sequence and the melting condition is observed during operation. Therefore, no complex operation process and professional temperature measuring knowledge are required, and the device is convenient and fast to use on site.

[0013] (2) The copper base block and the common metal block of the laser additive manufacturing temperature measuring device have relatively low cost, and no expensive high-precision temperature measuring equipment and sensors need to be additionally purchased. Therefore, the temperature measuring cost is greatly reduced, and the device is suitable for large-scale popularization and application.

[0014] (3) The laser additive manufacturing temperature measuring device is not limited to specific equipment brands and models according to the melting temperature characteristics of the metal, is easy to integrate and apply on various laser additive manufacturing equipment, and can also flexibly select pure metal and alloy blocks in a suitable melting point range according to different laser additive manufacturing processes, materials and actual application scenarios. Therefore, the device is suitable for temperature interval estimation requirements and has wide applicability to various complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The structure of the laser additive manufacturing temperature measuring device is shown in the drawing.

[0016] Fig. 1 copper mold groove, 2 copper base block, 3 metal block, 4 square hole body. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments.

[0018] Reference Figure 1 A laser additive manufacturing temperature measuring device, comprising a copper mold groove 1. The copper mold groove 1 comprises a copper base block 2 and a metal block 3, the copper base block 2 is provided with a plurality of square holes 4, the size of the copper base block 2 is 105mmx105mmx10mm, the size of the square hole 4 is 5mmx5mmx3mm, the spacing between the square holes 4 is 5mm, the boundary between the square holes 4 and the copper base block 2 is kept at 5mm, the metal block 3 is correspondingly arranged in the square hole 4 of the copper base block 2, and the upper surface of the metal block 3 is flush with the upper surface of the copper base block 2. The metal block 3 is composed of 100 pure metal blocks or alloy blocks of aluminum and tantalum with a melting point of 660-3017℃, and the metal blocks 3 are arranged in a rectangular array in order from high to low melting point.

[0019] Working principle: Before starting the laser additive manufacturing operation, first, the power, spot diameter and other parameters of the laser equipment are debugged according to the process requirements, which are the same as the actual planned process parameters, then the laser spot is aligned with the center position of the surface of the corresponding metal block in order from high to low melting point of the metal block, and the same laser power and scanning speed are used for short hitting. After hitting, the surface state of each metal block is observed immediately by optical microscope or naked eye. If the surface of the metal block with a melting point of 874.2℃ appears obvious melting marks such as surface gloss change and flow deformation, while the surface of the metal block with a melting point of 898℃ is not melted, it can be judged that the temperature under the action of the laser is in the range of 874.2-898℃, which provides a reference basis for subsequent manufacturing process temperature parameter adjustment.

[0020] The above-described embodiments only express part of the embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A laser additive manufacturing temperature measuring device comprising a copper die, characterized in that, The copper mold groove comprises a copper base block and a plurality of metal blocks with different melting points, the top of the copper base block is provided with a plurality of regular hole bodies, the metal blocks are correspondingly arranged in the regular hole bodies of the copper base block, and the upper surfaces of the metal blocks are flush with the upper surface of the copper base block.

2. The temperature measuring device for laser additive manufacturing according to claim 1, wherein, The metal blocks are pure metal blocks or alloy blocks.

3. The laser additive manufacturing temperature measuring device of claim 2, wherein, The metal blocks are sequentially arranged in the regular hole bodies of the copper base block in the order from high to low melting point.

4. The temperature measuring device for laser additive manufacturing according to any one of claims 1 to 3, characterized in that The plurality of regular hole bodies are arranged in a rectangular array.

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