Nozzle shell selective laser melting forming method

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0031] The method of the present invention includes the following steps:

[0032] Step one, use laser selective melting and additive manufacturing to form an aviation fuel nozzle housing 2 with a closed cavity structure, such as Figure 1-2 As shown, the forming direction of the nozzle housing 2 parts is placed vertically.

[0033] The nozzle housing 2 includes a nozzle head, a rod, and a mounting plate that are connected in sequence. The bottom of the mounting plate is provided with a main oil passage oil inlet interface and a secondary oil passage oil inlet interface, a main oil passage oil inlet interface and a secondary oil passage oil inlet interface. They are perpendicular to each other and are connected to two independent oil passages respectively. The two independent oil passages are arranged inside the rod, the nozzle head is provided with a nozzle opening, and the two independent oil passages merge to the nozzle opening, and the rod is provided with a completely closed ring Insulation cavity 1, which wraps two independent oil passages.

[0034] The powder hole is prefabricated on the process model of the nozzle shell 2. The powder hole is placed on the plane structure of the nozzle shell 2. The powder hole is through hole 3, and two powder holes are placed respectively. The powder holes on the same plane are in The diagonal positions of the upper and lower ends of the heat insulation cavity 1 area, the through holes 3 on both sides of the plane are arranged in a staggered manner, such as figure 1 Shown.

[0035] The powder outlet hole is a cone hole, the diameter of the large end is φ2-3mm, and the taper is 3-5°. The taper of test rod 4 and the powder outlet are the same, such as image 3 Shown.

[0036] In the process of forming the nozzle housing 2, the same batch of cone test rods 4 with more than the number of powder holes in the process are designed. The structure of the cone test rod 4 is as follows Figure 4 As shown, the taper of test bar 4 is consistent with the taper of the process powder hole. The diameter of test bar 4 gradually decreases from both ends to the center. The largest part of the diameter is larger than the diameter of the large end of the taper hole, and the smallest part of the diameter is not greater than the diameter of the small end of the taper hole. ; A test bar 4 can be divided into two cone test bars 4, before the test bar 4 is inserted into the through hole 3, the test bar 4 is disconnected from the middle.

[0037] The fuel nozzle housing 2 and the cone test rod 4 are reasonably placed on the substrate used in the existing additive manufacturing equipment.

[0038] Step 2: After the additive manufacturing is formed, use compressed air, mallet and other tools to clean the substrate, the surface of the component and the metal powder in the heat insulation chamber 1. In the process of cleaning the metal powder in the heat insulation chamber 1, seal the two parts in different directions. There are two powder outlet holes to keep the other two powder outlet holes unobstructed. One of them is used as the air inlet and the other is used as the air outlet. Compressed gas is introduced into the air inlet. The gas carries metal powder and sprays out from the air outlet. The holes 3 are cyclically operated in turn until the metal powder in the heat insulation cavity 1 is completely removed, and the nozzle housing 2 is photographed with X-rays, and the inside of the heat insulation cavity 1 is observed through the X-rays to determine whether the inside of the heat insulation cavity 1 contains metal powders, so as to determine the heat insulation cavity Is the metal powder in 1 cleaned up?

[0039] Vacuum heat treatment is used to remove the stress during the forming process of the substrate and components.

[0040] The substrate, the nozzle housing 2 and the test bar 4 are cut by a wire cutting method, and the substrate is separated from the nozzle housing 2 and the test bar 4. The cutting test bar 4 is two cone test bars 4.

[0041] Grind and polish the nozzle housing 2 parts and the end face of the cone test rod 4, and the end face of the cone test rod 4 is consistent with the powder outlet hole diameter of the nozzle housing 2.

[0042] Clean the nozzle housing 2 and the cone test rod 4.

[0043] Step 3: Adopt a welding method to seal the process powder hole with a cone test rod 4, and polish the welding surface to complete the additive manufacturing of the nozzle housing 2.

[0044] The above content is only to illustrate the technical ideas of the present invention, and cannot be used to limit the scope of protection of the present invention. Any changes made on the basis of the technical solutions based on the technical ideas proposed by the present invention shall fall into the claims of the present invention. Within the scope of protection.