CN-121988862-A - Friction stir solid-phase material-increasing stirring tool and solid-phase material-increasing method

CN121988862ACN 121988862 ACN121988862 ACN 121988862ACN-121988862-A

Abstract

The invention relates to a friction stir solid-phase material-adding stirring tool and a solid-phase material-adding method, wherein the stirring tool comprises a hollow main shaft, a stirring rod and a stirring rod, wherein the hollow main shaft is used for axially passing through and downwards conveying a rod; the stirring pin comprises a plurality of stirring pins and spiral grooves, wherein the stirring pins are vertically protruded out of the peripheral area of the shaft shoulder end face, and the spiral grooves are arranged on the peripheral surfaces of all the stirring pins and are used for guiding plasticized materials along the height direction of the material increase when the stirring pins rotate so as to enhance interlayer binding force. The spiral groove is arranged on the outer side of the stirring pin, and after the stirring pin is used for stirring, the material flow of the material in the height direction is realized under the action of the spiral groove, so that the combination property and the mechanical property of the material in the height direction are better, the high deposition efficiency is ensured, and the tissue uniformity and the interlayer binding force of the material in the height direction are improved.

Inventors

ZHOU FAQUAN
HUANG RUNGEN
WEI YE
LI BAICHENG
LI FENG
LIN YONGYONG
ZHU ZHIXIONG
GONG XIUMEI
GUO DAWEI

Assignees

航天工程装备（苏州）有限公司
澳门发展及质量研究所

Dates

Publication Date: 20260508
Application Date: 20260122

Claims (10)

1. The friction stir solid phase material adding stirring tool is characterized by comprising: a hollow spindle through which the bar stock axially passes and is conveyed downwards; the shaft shoulder is fixedly arranged at the lower end of the hollow main shaft, and the shaft shoulder is provided with a shaft shoulder end face; the stirring pin comprises a plurality of stirring pins which are vertically protruded out of the peripheral area of the end face of the shaft shoulder; The spiral grooves are arranged on the outer peripheral surfaces of all stirring pins and used for guiding the plasticized material along the height direction of the material increase when the stirring pins rotate so as to enhance the interlayer binding force.
2. A friction stir solid phase additive stirring tool according to claim 1, wherein the spiral grooves on the periphery of each stirring pin are connected end to form a continuous spiral line.
3. The friction stir solid phase additive stirring tool of claim 1, wherein a wrench operating surface is arranged on the outer edge of the hollow main shaft and used for disassembling and assembling the stirring tool.
4. The friction stir solid phase additive stirring tool of claim 1 wherein the number of stirring pins is at least 2 and evenly distributed on the same circumference.
5. A friction stir solid phase additive stirring tool according to claim 1, wherein the axial length of the stirring pin is equal to or greater than a single layer additive height.
6. The friction stir solid phase additive stirring tool of claim 1 wherein the pin is cone-shaped or drop-shaped.
7. The friction stir solid phase additive stirring tool of claim 1, wherein the hollow spindle, the shaft shoulder and the stirring pin are integrally formed.
8. A solid phase additive method using the friction stir solid phase additive stirring tool of any one of claims 1-7, comprising the steps of: S1, fixing a substrate on an equipment workbench to serve as a matrix of a solid-phase material-adding first layer; S2, inserting a bar stock into the hollow main shaft and enabling the lower end of the bar stock to be in contact with the surface of the substrate or the previous layer of additive; S3, driving the stirring tool and the bar to rotate at a high speed around a common axis, and simultaneously applying axial upsetting force to the bar to enable the stirring pin and the substrate or the surface of the previous layer of material increase to generate friction heat so as to form a plasticizing zone; s4, controlling a stirring tool to move forward along a set track in a translational manner, and depositing plasticized materials layer by layer to form an additive layer; S5, in the deposition process, the spiral action of the spiral groove drives the material to flow along the height direction of the additive, so that the interlayer binding force is enhanced; And S6, after the first layer of material addition is finished, controlling the shaft shoulder of the stirring tool to axially lift, repeating the steps S3-S5, and continuously adding material until the required three-dimensional material addition body is formed.
9. The friction stir solid phase additive method of claim 8 further comprising a preheating step prior to step S3 of maintaining the pin in contact with the substrate and rotating at a rotational speed lower than the forming rotational speed, wherein the pin frictionally generates heat with the surface of the substrate to effect localized preheating of the substrate.
10. The friction stir solid phase additive method of claim 8 wherein the set trajectory is a straight trajectory or a curved trajectory.

Description

Friction stir solid-phase material-increasing stirring tool and solid-phase material-increasing method Technical Field The invention relates to the technical field of metal additive manufacturing, in particular to a friction stir solid-phase additive stirring tool and a solid-phase additive method. Background Solid friction stir additive manufacturing is an emerging metal additive manufacturing technology. The principle is that a metal bar is continuously fed under a rotating shaft shoulder through a hollow main shaft, and the material is subjected to plastic deformation without melting by means of friction heat between the shaft shoulder and a base plate, and is deposited and formed layer by layer under the upsetting action of the shaft shoulder. Existing AFSD equipment commonly adopts two types of stirring tools: the end face of the shaft shoulder is a simple plane, and the whole friction of the end face is relied on to generate heat and extrude materials for forming; A single conical or water drop-shaped stirring pin is arranged on the end face of the shaft shoulder, and grains are further refined and interlayer combination is improved through rotation and extrusion actions of the stirring pin. However, the above-described architecture of AFSD devices still suffers from the following disadvantages: the plane end face can only realize transverse shearing, the mobility of the material in the deposition height direction is poor, the metallurgical bonding strength between layers is limited, and a weak interface is easy to form; Although the single cone/drop needle can locally enhance stirring, it is difficult to generate uniform material flow in the height direction in the whole layer range, and the abrasion of the needle tip is fast and the service life is low. Therefore, there is a need for a friction stir solid phase additive stirring tool and solid phase additive method that address the shortcomings of the prior art. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to overcome the defects in the prior art, and provide a stirring friction solid-phase material-adding stirring tool and a material-adding method, wherein the stirring friction solid-phase material-adding stirring tool is based on stirring and material-adding of a material subjected to extrusion friction thermal plasticization of bars and shaft shoulders, and spiral grooves are arranged on the periphery of a stirring pin, so that the solid-phase material-adding structure between an additive layer and a layer is more uniform, the interlayer binding force is more excellent, the material flowability in the height direction is more excellent, and the interlayer binding force and the overall mechanical property are remarkably improved while the high deposition efficiency is maintained. In order to solve the above technical problems, the present invention provides a friction stir solid phase additive stirring tool, including: a hollow spindle through which the bar stock axially passes and is conveyed downwards; the shaft shoulder is fixedly arranged at the lower end of the hollow main shaft, and the shaft shoulder is provided with a shaft shoulder end face; the stirring pin comprises a plurality of stirring pins which are vertically protruded out of the peripheral area of the end face of the shaft shoulder; The spiral grooves are arranged on the outer peripheral surfaces of all stirring pins and used for guiding the plasticized material along the height direction of the material increase when the stirring pins rotate so as to enhance the interlayer binding force. In one embodiment of the present invention, the spiral grooves on the periphery of each stirring pin are connected end to form a continuous spiral line. The spiral grooves on the periphery of each stirring pin are connected end to form a continuous spiral line, flow interruption caused by sectional threads is eliminated, continuity and uniformity of longitudinal material flow are further guaranteed, tissue consistency is improved, the limitation that the traditional shaft shoulder only transversely shears materials is broken, exchange and metallurgical bonding strength of interlayer materials are remarkably improved, and therefore tissue uniformity and mechanical properties of the additive body in the height direction are enhanced. In one embodiment of the invention, a wrench operating surface is arranged on the outer edge of the hollow main shaft and used for disassembling and assembling the stirring tool. The spanner operation face is realized not needing special frock can quick assembly disassembly stirring instrument, shortens the shut down time of changing a piece, improves production beat and equipment utilization ratio. In one embodiment of the present invention, the number of the stirring pins is at least 2, and the stirring pins are uniformly distributed on the same circumference. The design ensures that friction heat and plastic deformation