Manufacturing method and device for composite friction stirring near-net forming additional material

A friction stir, near-net-shape technology, applied in manufacturing tools, non-electric welding equipment, welding equipment, etc., can solve the problems of high clamping requirements, long processing time, complicated disassembly and assembly, etc. Material efficiency and simple device structure

Active Publication Date: 2017-11-24

NANCHANG HANGKONG UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method and device for friction stir near-net shape additive of composite materials, so as to solve the problem of high workpiece clamping requirements, complicated disassembly and assembly, and time-consuming follow-up processing in friction sti...

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Abstract

The invention discloses a manufacturing method and device for a composite friction stirring near-net forming additional material. The device comprises a mold base, cavity plates and a cover plate. End baffles are mounted at the two ends of the mold base. A cushion block is put in a cavity of the mold base, and the two ends of the cushion block abut against the end baffles. A lateral baffle is mounted on the side face of the cushion block. The cavity plates are arranged on the upper portion of the cushion block. Each cavity plate is arranged in a left-and-right split manner, and a rectangular clearance is reserved in the middle of each cavity plate. The cover plate is connected with the upper portion of the mold base, and a rectangular groove hole is formed in the middle of the cover plate. In the additional material manufacturing process, the cavity plates are additionally mounted, and therefore continuous and efficient operation of adding a to-be-stirred material in the composite additional material manufacturing process is achieved, and the device can achieve manufacturing of the composite near-net forming additional material in a solid state. The device is simple, easy and convenient to operate and high in material utilization rate, and the defects such as air holes generated by a fusion method are avoided.

Application Domain

Non-electric welding apparatus

Technology Topic

EngineeringMechanical engineering +2

Image

Examples

Experimental program(3)

Example Embodiment

[0031] Example 1:

[0032] Such as Figure 1-3 As shown, this embodiment describes in detail a method and device for manufacturing a friction stir near-net forming additive for composite materials of the present invention.

[0033] Such as figure 1 with 2 As shown, this embodiment provides a device for friction stir near-net forming additive for composite materials, which includes a mold base 2, a cavity plate, and a cover plate 1, and end stops are installed at both ends of the mold base 2. Plate 3, a cushion block 8 is placed in the cavity of the mold base 2, and the two ends of the cushion block 8 abut against the end baffle 3, the side of the cushion block 8 is installed with a lateral baffle 9, the lateral baffle 9 and two Each end baffle can better stabilize the cushion block 8. The upper part of the cushion block 8 is provided with a shaped cavity plate. The shaped cavity plate is separated from the left and the right and a rectangular gap is reserved in the middle. The cover plate 1 is connected to the upper part of the mold base 2. A rectangular slot hole is opened in the middle of the cover plate 1, and the width of the rectangular slot hole of the cover plate 1 is 5mm larger than the diameter of the shaft shoulder of the stirring head.

[0034] Specifically, the cavity plate includes an upper cavity plate 5 and a lower cavity plate 7. The lower cavity plate 7 is placed on the upper surface of the cushion block 8, the upper cavity plate 5 is arranged on the lower cavity plate 7, and the upper cavity plate 5 It includes two identical first plate-shaped bodies arranged symmetrically, the cross-section of the first plate-shaped body is stepped, and the height of the inner step of the first plate-shaped body is lower than the height of the outer step; the lower cavity plate 7 includes two symmetrical Two identical second plate-shaped bodies, the second plate-shaped bodies are two rectangular plates, and the distance between the second plate-shaped bodies is equal to the distance between the first plate-shaped bodies; a plug is provided in the rectangular gap in the middle of the cavity plate 6. The plugs 6 are placed at both ends of the rectangular gap. In this embodiment, the plugs 6 have a variety of specifications and can be processed according to specific needs. The plugs 6 used in this device have a certain length and thickness, and require high width accuracy. Specifically, the plug 6 has three specifications to choose from, namely 9±0.01, 10.5±0.01, and 12±0.01 mm.

[0035] In this embodiment, the cavity plate is divided into upper and lower parts. In the process of adding the composite material, the upper cavity plate 5 and the plug 6 can be continuously added to make composite materials with multiple gradient functions. The width between the inner steps of the plate-shaped body is 8mm larger than the diameter of the shaft shoulder of the stirring head, which facilitates the smooth entry of the shaft shoulder of the stirring head into the rectangular gap of the cavity plate, and facilitates the additive manufacturing of the mixing material; cover plate 1 and upper cavity plate There is also an auxiliary pressing plate 4 between the outer steps of the first plate-shaped body of 5. The auxiliary pressing plate 4 increases according to the increase of the composite material, and the upper cavity plate 5 is continuously increased, and the auxiliary pressing plate 4 is continuously reduced, which serves as a dynamic stable cavity The role of the board.

[0036] In this embodiment, the cavity plate, the plug block 6, the spacer block 8 and the auxiliary pressing plate 4 are all made of TC4 titanium alloy, which has a small thermal conductivity and a high surface finish.

[0037] Such as figure 2 As shown, the present embodiment is provided with 8 first threaded holes 2-1, 4 second threaded holes 2-2, 6 third threaded holes 2-3, and 4 fourth threaded holes on the mold base 2. 2-4; The first threaded hole 2-1 is used to tighten the end baffle 3 by bolts, each end baffle 3 has 4 threaded holes, and the second threaded hole 2-2 is used to tighten the end baffle 3 by bolts The side baffle 9, the cover plate 1 is provided with a bolt hole 1-1 corresponding to the third threaded hole 2-3, and the bolt passes through the bolt hole 1-1 of the cover plate 1 to tighten the third thread of the mold base 2 In the hole 2-3, the cover plate 1 is fixed on the mold base 2 and the fourth threaded hole 2-4 is a through hole, which is convenient for material removal and mold disassembly.

[0038] Such as image 3 As shown, this embodiment also provides a method for manufacturing a composite material friction stir near-net shape additive, which includes the following steps:

[0039] (1) Install the device and put in the materials to be mixed;

[0040] First install the mold base on the workbench, fix the end baffle 3 on the mold base with a set screw, place the cushion block 8 in the cavity of the mold base, and then place the side baffle 9 on the belt Pre-tighten the side with lateral screw holes; then place the lower cavity plate 7 on the upper surface of the spacer block 8, and place the plug 6 in the middle of the second plate-shaped body of the lower cavity plate 7, leaving room for material placement , Used to place the material to be stirred; then place the upper cavity plate 5 on the upper surface of the lower cavity plate 7, and also place the plug block 6 in the middle of the first plate-shaped body of the upper cavity plate 5, in the plug block Put the material to be mixed in the space between 6, then place the auxiliary plate 4 on the outer step of the upper surface of the upper cavity plate 5, and finally install the baffle 3 at the other end of the mold base, and put the cover plate 1 Cover and pre-fix with set screws;

[0041] (2) Manufacturing additive materials;

[0042] Turn on the stirring head, the stirring head passes through the rectangular slot of the cover plate 1, and then the stirring needle of the stirring head enters the rectangular gap of the cavity plate and collides with the material to be stirred. The stirring needle starts to add a single layer of the material to be stirred; Disassemble the cover plate 1, the auxiliary pressing plate 4 and the upper cavity plate 5, add a layer of the upper cavity plate 5 and the material to be added, and then fix the upper cavity plate 5, the auxiliary pressing plate 4 and the cover plate 1 in turn, Use the first layer of additive parameters for additive manufacturing, repeat the above steps, and finally obtain a well-shaped, defect-free bulk additive material.

[0043] In step 2, the stirring needle of the stirring head is a conical stirring needle, the diameter of the stirring needle is not more than 8mm, the length of the stirring needle is 4.5mm, the diameter of the shaft shoulder of the stirring head is 20mm, and the material of the stirring needle is directional solidification superalloy.

[0044] On the basis of Example 1, for the method for manufacturing a friction stir near-net shape additive for composite materials provided in Example 1, there are the following preferred different examples in step 2:

Example Embodiment

[0045] Example 2. In step 2, the width of the plug 6 is 9mm±0.01, the material thickness is 4mm, the rotation speed is 600rpm, the welding speed is 45mm/min, the inclination of the stirring head is 2°, and the stirring needle is stirred for at least 5 times; other steps and examples the same.

Example Embodiment

[0046] Example 3, in step 2, the width of the plug 6 is 10.5±0.01mm, the material thickness is 4mm, the rotation speed is 750rpm, the welding speed is 30mm/min, the inclination of the stirring head is 2°, and the stirring needle is stirred for at least 5 times; other steps and implementation The same applies.

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PUM

Property	Measurement	Unit
Width	9.0	mm
Thickness	4.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Simple device structure

Manufacturing method and device for composite friction stirring near-net forming additional material

A friction stir, near-net-shape technology, applied in manufacturing tools, non-electric welding equipment, welding equipment, etc., can solve the problems of high clamping requirements, long processing time, complicated disassembly and assembly, etc. Material efficiency and simple device structure

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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