Friction stir additive continuous rod feeding mechanism

Abstract

The invention relates to a stirring friction additive continuous bar feeding mechanism which comprises a spiral supporting mechanism, a spiral continuous feeding mechanism, a rotary driving mechanism, a main shaft and a square bar. The spiral continuous feeding mechanism can be driven by the rotary driving mechanism to integrally rotate in the spiral supporting mechanism, a square bar penetrates through the spiral supporting mechanism, the spiral continuous feeding mechanism and the main shaft, and when the spiral continuous feeding mechanism integrally rotates, the square bar is driven to rotate and be conveyed into the main shaft. According to the stirring friction material increasing continuous bar feeding mechanism, the spiral transmission mechanism is adopted for achieving continuous driving of square bars and bearing upsetting force in the material increasing process. The mechanism adopts two screw rods in the same shape, the distance between the two screw rods is slightly smaller than the width size of a square rod, the outer enveloping size of each screw rod is conical, screw rod teeth can slowly cut into a bar, and axial driving of the bar is achieved through shearing force formed at a notch of the bar.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a friction stir material additive continuous rod feeding mechanism. Background Art

[0002] Additive manufacturing is the process of manufacturing solid parts by layering and stacking materials. Compared with traditional processing methods such as casting and welding, it has the advantages of high efficiency and speed. Especially for the processing of complex and precise structural parts, it has high flexibility and adaptability. Currently, the commonly used additive technologies include laser powder sintering additive, electron beam powder sintering additive, fused deposition modeling additive, stir friction solid additive, etc.

[0003] Friction stir additive technology is a new type of 3D additive technology, which mainly uses rods or wires as raw materials, that is, "friction stir deposition additive". It is a solid-phase additive technology developed based on friction stir welding. It uses the friction heat generated by the high-speed extrusion and friction between the friction stir tool and the cladding material to accumulate and diffuse the cladding material layer by layer to form a connection. It avoids defects such as solidification shrinkage, thermal cracks, and pores. It is an efficient additive process with a low defect rate. In the existing friction stir additive processing, the cladding materials are mainly in the form of metal rods, metal wires, metal particles, etc.

[0004] When the cladding material is in the form of a metal bar: the bar is clamped on the machine tool spindle. During the processing, the bar and the spindle rotate synchronously at high speed, and the lower end of the bar is in contact with the substrate metal for extrusion to achieve material addition. This method has a relatively simple equipment structure. The bar needs to be pre-clamped inside the spindle. It is impossible to feed continuously during the processing, and the length of the bar is limited by factors such as equipment size and driving force, so continuous processing cannot be achieved. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the rod material additive technology in the stir friction solid phase additive technology in the prior art, which is more focused on discontinuous feeding additive, has low additive efficiency and large structural size.

[0006] In order to solve the above technical problems, the present invention provides a continuous rod feeding mechanism for friction stir additive, comprising: a spiral support mechanism, a spiral continuous feeding mechanism, a rotary drive mechanism, a main shaft and a square rod; wherein the spiral support mechanism is a supporting component, and the main shaft and the spiral support mechanism are fixedly connected, the spiral continuous feeding mechanism is arranged on the spiral support mechanism, and the spiral continuous feeding mechanism is located on the side of the main shaft along which the square rod is fed, the rotary drive mechanism is connected to the spiral continuous feeding mechanism, and the spiral continuous feeding mechanism can rotate as a whole inside the spiral support mechanism driven by the rotary drive mechanism, the square rod passes through the spiral support mechanism, the spiral continuous feeding mechanism and the main shaft, and when the spiral continuous feeding mechanism rotates as a whole, it drives the square rod to perform a rotational motion and be transported into the main shaft.

[0007] In one embodiment of the present invention, the rotary drive mechanism includes a driven wheel, a driving belt, a driving active wheel and a driving motor, the rotating shaft of the driving motor is connected to the driving active wheel, the driving belt is sleeved on the driven wheel and the driving active wheel, and the driving active wheel drives the driven wheel to rotate through the driving belt, and the driven wheel is connected to the main shaft.

[0008] In one embodiment of the present invention, the spindle includes a spindle body, an additive tool holder and a spindle core shaft, the spindle body is fixedly connected to one end of the spiral support mechanism, the spindle core shaft is arranged inside the spindle body, and one end of the spindle core shaft is fixedly connected to the driving driven wheel, the additive tool holder is arranged on the other end of the spindle core shaft away from the driving driven wheel, and the square bar passes through the spindle core shaft and is discharged from the additive tool holder.

[0009] In one embodiment of the present invention, the spiral continuous feeding mechanism includes a driving gear, a left driving gear, a right screw rod, a left screw rod, a screw frame, a lower spindle connecting plate, a rotating shaft sleeve and a right driving gear. The lower spindle connecting plate is connected to the spindle core shaft, and the lower spindle connecting plate can rotate synchronously with the spindle core shaft. The lower spindle connecting plate is fixedly connected to the screw frame. The screw frame is connected with a rotating shaft sleeve. The driving gear is sleeved on the rotating shaft sleeve, and the rotating shaft sleeve can rotate synchronously with the screw frame. The left driving gear and the right driving gear are both meshed with the driving gear, and the driving gear drives the left driving gear and the right driving gear to rotate synchronously. The right screw rod and the left screw rod are both arranged on the screw frame. The left driving gear is connected to the left screw rod, and the right driving gear is connected to the right screw rod. The right screw rod and the left screw rod are symmetrically arranged. After the square bar passes through the rotating shaft sleeve, it passes through the gap between the axis directions of the right screw rod and the left screw rod.

[0010] In one embodiment of the present invention, the right spiral rod and the left spiral rod are both arranged in a conical shape, and the diameters of the right spiral rod and the left spiral rod gradually increase from the spiral support mechanism to the main shaft. The square rod is connected to the threads on the outer walls of the right spiral rod and the left spiral rod, and the square rod is moved and fed from the spiral support mechanism to the main shaft under the action of the spiral rotation force of the right spiral rod and the left spiral rod.

[0011] In one embodiment of the present invention, the screw frame is a rectangular frame, and a left bearing and a right bearing are provided on the screw frame. The rotating shafts at both ends of the right screw are arranged on the screw frame through the right bearing, and the rotating shafts at both ends of the left screw are arranged on the screw frame through the left bearing. Bearings are installed at both ends of the right screw and the left screw to withstand axial force and meet the requirements of conventional additive use.

[0012] In one embodiment of the present invention, threads are provided on the outer walls of the right and left spiral rods, and the spiral angles of the right and left spiral rods are the same, and the spiral angles of the right and left spiral rods are smaller than the self-locking angles of the right and left spiral rods. The spiral angles of the right and left spiral rods are smaller than the self-locking angles, and once the bar enters, it can achieve self-locking and provide sufficient axial force.

[0013] In one embodiment of the present invention, a third bearing is provided on the screw frame, and the rotating shaft sleeve is connected to the screw frame via the third bearing.

[0014] In one embodiment of the present invention, the spiral support mechanism includes a spiral support frame and a spiral support bearing, the spiral support frame is in the shape of a U-shaped plate, the spiral continuous feeding mechanism is located in the U-shaped groove of the spiral support frame, and the spiral support bearing is arranged on the middle crossbeam of the spiral support frame.

[0015] In one embodiment of the present invention, the rotating shaft sleeve is connected to the spiral support frame through a spiral support bearing.

[0016] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The friction stir additive continuous rod feeding mechanism of the present invention adopts a spiral transmission mechanism to realize continuous driving of square rods and bear the upsetting force during the additive process. The mechanism adopts two spiral rods of the same shape, the distance between the two spiral rods is slightly smaller than the width of the square rod, the outer envelope size of the spiral rod is conical, and the spiral rod teeth can slowly cut into the rod, and the shear force formed at the cut of the rod is used to realize the axial driving of the rod.

[0017] The friction stir additive continuous rod feeding mechanism of the present invention has the following advantages: 1. The continuous feeding of bar materials is completed by a spiral mechanism, which can achieve infinite continuity and has a simple structure; 2. Square bars are used as the raw material for the continuous feeding mechanism to avoid the relative rotation of round bars after they enter the spindle, which causes the rotation speed of the bars to be inconsistent with the additive tool; 3. While conveying the bar material, the spiral mechanism also has the ability of self-locking, providing sufficient axial force for the bar material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 This is an overall assembly diagram of a friction stir additive continuous rod feeding mechanism in a preferred embodiment of the present invention; Figure 2 The cross section of the continuous rod feeding mechanism of the friction stir additive in the preferred embodiment of the present invention is Figure 1 ; Figure 3 It is a schematic diagram of the local structure of the continuous rod feeding mechanism of the friction stir additive in the preferred embodiment of the present invention; Figure 4 The cross section of the continuous rod feeding mechanism of the friction stir additive in the preferred embodiment of the present invention is Figure 2 .

[0019] Explanation of the reference numerals in the specification: 1 spiral support mechanism, 101 spiral support frame, 102 spiral support bearing, 2 spiral continuous feeding mechanism, 201 driving gear, 202 driving gear, 203 left bearing, 204 right spiral rod, 205 left spiral rod, 206 screw rod frame, 207 lower spindle connecting plate, 208 rotating shaft sleeve, 209 right driving gear, 2010 right bearing, 2011 bearing three, 3 rotating drive mechanism, 301 driving driven wheel, 302 driving belt, 303 driving driving wheel, 304 driving motor, 4 spindle, 401 spindle body, 402 additive tool, 403 spindle core shaft, 5 square bar. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0021] Reference Figure 1-4As shown, the friction stir additive continuous rod feeding mechanism of the present invention comprises: a spiral support mechanism 1, a spiral continuous feeding mechanism 2, a rotary drive mechanism 3, a spindle 4 and a square rod 5; wherein the spiral support mechanism 1 is a support component, and the spindle 4 and the spiral support mechanism 1 are fixedly connected, the spiral continuous feeding mechanism 2 is arranged on the spiral support mechanism 1, and the spiral continuous feeding mechanism 2 is located on the side of the spindle 4 along which the square rod 5 is fed, the rotary drive mechanism 3 is connected to the spiral continuous feeding mechanism 2, and the spiral continuous feeding mechanism 2 can rotate as a whole inside the spiral support mechanism 1 under the drive of the rotary drive mechanism 3, the square rod 5 penetrates the spiral support mechanism 1, the spiral continuous feeding mechanism 2 and the spindle 4, and when the spiral continuous feeding mechanism 2 rotates as a whole, it drives the square rod 5 to perform a rotary motion and transport it into the spindle 4. The square rod 5 enters the spiral continuous feeding mechanism 2 from the spiral support mechanism 1, and enters the spindle 4 under the transmission of the spiral continuous feeding mechanism 2.

[0022] In the above structure, the rotating drive mechanism 3 includes a driving driven wheel 301, a driving belt 302, a driving driving wheel 303 and a driving motor 304, the rotating shaft of the driving motor 304 is connected to the driving driving wheel 303, the driving belt 302 is sleeved on the driving driven wheel 301 and the driving driving wheel 303, and the driving driving wheel 303 drives the driving driven wheel 301 to rotate through the driving belt 302, and the driving driven wheel 301 is connected to the main shaft 4.

[0023] In the above structure, the spindle 4 includes a spindle body 401, an additive tool holder 402 and a spindle mandrel 403. The spindle body 401 is fixedly connected to one end of the spiral support mechanism 1, the spindle mandrel 403 is arranged inside the spindle body 401, and one end of the spindle mandrel 403 is fixedly connected to the driving driven wheel 301. The additive tool holder 402 is arranged on the other end of the spindle mandrel 403 away from the driving driven wheel 301, and the square bar 5 passes through the spindle mandrel 403 and is discharged from the additive tool holder 402. The driving driven wheel 301 is sleeved on one end of the spindle mandrel 403, and the spindle mandrel 403 is coaxially arranged with the driving driven wheel 301, and the spindle mandrel 403 rotates synchronously with the driving driven wheel 301. When the rotary drive mechanism 3 is in operation, it drives the 403 spindle mandrel and the spiral continuous feeding mechanism 2 to rotate.

[0024] In the above structure, the spiral continuous feeding mechanism 2 includes a driving gear 201, a left driving gear 202, a right spiral rod 204, a left spiral rod 205, a screw frame 206, a lower spindle connecting plate 207, a rotating shaft sleeve 208 and a right driving gear 209. The lower spindle connecting plate 207 is connected to the spindle core shaft 403, and the lower spindle connecting plate 207 can rotate synchronously with the spindle core shaft 403. The lower spindle connecting plate 207 is fixedly connected to the screw frame 206, and the screw frame 206 is connected to the rotating shaft sleeve 208. The driving gear 201 is sleeved on the rotating shaft sleeve 208, and the rotating shaft sleeve 208 can rotate synchronously with the spindle core shaft 403. With the synchronous rotation of the screw frame 206, the left driving gear 202 and the right driving gear 209 are both meshed with the driving gear 201, and the driving gear 201 drives the left driving gear 202 and the right driving gear 209 to rotate synchronously, the right screw rod 204 and the left screw rod 205 are both arranged on the screw frame 206, the left driving gear 202 is connected to the left screw rod 205, the right driving gear 209 is connected to the right screw rod 204, the right screw rod 204 and the left screw rod 205 are symmetrically arranged, and the square bar 5 passes through the gap between the axis direction of the right screw rod 204 and the left screw rod 205 after passing through the rotating shaft sleeve 208. The driving gear 201, the left driving gear 202 and the right driving gear 209 are on the same straight line, and the left driving gear 202 and the right driving gear 209 are respectively located on both sides of the driving gear 201, and the left driving gear 202 and the right driving gear 209 are symmetrically arranged on both sides of the driving gear 201.

[0025] In the above structure, the right spiral rod 204 and the left spiral rod 205 are both arranged in a conical shape, and the diameters of the right spiral rod 204 and the left spiral rod 205 gradually increase along the direction from the spiral support mechanism 1 to the main shaft 4. The square bar 5 is connected with the threads on the outer walls of the right spiral rod 204 and the left spiral rod 205, and the square bar 5 is moved and fed from the spiral support mechanism 1 to the direction of the main shaft 4 under the action of the spiral rotation force of the right spiral rod 204 and the left spiral rod 205.

[0026] In the above structure, the screw frame 206 is a rectangular frame, and the screw frame 206 is provided with a left bearing 203 and a right bearing 2010, the rotating shafts at both ends of the right screw rod 204 are arranged on the screw frame 206 through the right bearing 2010, and the rotating shafts at both ends of the left screw rod 205 are arranged on the screw frame 206 through the left bearing 203. The outer walls of the right screw rod 204 and the left screw rod 205 are both provided with threads, and the helical angles of the right screw rod 204 and the left screw rod 205 are the same, and the helical angles of the right screw rod 204 and the left screw rod 205 are smaller than the self-locking angles of the right screw rod 204 and the left screw rod 205. The screw frame 206 is provided with a bearing three 2011, and the rotating shaft sleeve 208 is connected to the screw frame 206 through the bearing three 2011.

[0027] In the above structure, the spiral support mechanism 1 includes a spiral support frame 101 and a spiral support bearing 102, the spiral support frame 101 is in a U-shaped plate shape, the spiral continuous feeding mechanism 2 is located in the U-shaped groove of the spiral support frame 101, and the spiral support bearing 102 is arranged on the middle crossbeam of the spiral support frame 101. The rotating shaft sleeve 208 is connected to the spiral support frame 101 through the spiral support bearing 102.

[0028] The driving gear 201 can be rotated by an external driving mechanism passing through the spiral support bearing 102 of the spiral support mechanism 1. The rotation of the main shaft gear 201 drives the left driving gear 202 to rotate, and the left driving gear 202 drives the right spiral rod 204 and the left spiral rod 205 to rotate.

[0029] When the square bar 5 enters the spiral continuous feeding mechanism 2, the right spiral rod 204 and the left spiral rod 205 rotate, gradually cut into the square bar 5, and under the action of the spiral drive, the square bar 5 moves axially downward. The right spiral rod 204 and the left spiral rod 205 are conical in design, and the cutting of the square bar 5 is a slow process.

[0030] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A continuous rod feeding mechanism for friction stir additive, characterized in that: include: Screw support mechanism, screw continuous feeding mechanism, rotary drive mechanism, spindle and square bar; Among them, the spiral support mechanism is a supporting component, and the main shaft and the spiral support mechanism are fixedly connected, the spiral continuous feeding mechanism is arranged on the spiral support mechanism, and the spiral continuous feeding mechanism is located on the side of the main shaft along which the square bar is fed, the rotary drive mechanism is connected to the spiral continuous feeding mechanism, and the spiral continuous feeding mechanism can rotate as a whole inside the spiral support mechanism driven by the rotary drive mechanism, the square bar passes through the spiral support mechanism, the spiral continuous feeding mechanism and the main shaft, and when the spiral continuous feeding mechanism rotates as a whole, it drives the square bar to perform a rotational motion and be transported into the main shaft.

2. The friction stir additive continuous rod feeding mechanism according to claim 1, characterized in that: The rotary drive mechanism includes a driven wheel, a driving belt, a driving wheel and a driving motor. The rotating shaft of the driving motor is connected to the driving wheel. The driving belt is sleeved on the driven wheel and the driving wheel. The driving wheel drives the driven wheel to rotate through the driving belt. The driven wheel is connected to the main shaft.

3. The friction stir additive continuous rod feeding mechanism according to claim 2, characterized in that: The spindle comprises a spindle body, an additive tool holder and a spindle core shaft. The spindle body is fixedly connected to one end of a spiral support mechanism, the spindle core shaft is arranged inside the spindle body, and one end of the spindle core shaft is fixedly connected to a driving driven wheel. The additive tool holder is arranged on the other end of the spindle core shaft away from the driving driven wheel, and the square bar material passes through the spindle core shaft and is discharged from the additive tool holder.

4. The friction stir additive continuous rod feeding mechanism according to claim 3, characterized in that: The spiral continuous feeding mechanism comprises a driving gear, a left driving gear, a right spiral rod, a left spiral rod, a screw frame, a lower spindle connecting plate, a rotating shaft sleeve and a right driving gear. The lower spindle connecting plate is connected to the spindle core shaft, and the lower spindle connecting plate can rotate synchronously with the spindle core shaft. The lower spindle connecting plate is fixedly connected to the screw frame. The screw frame is connected with a rotating shaft sleeve. The driving gear is sleeved on the rotating shaft sleeve, and the rotating shaft sleeve can rotate synchronously with the screw frame. The left driving gear and the right driving gear are both meshed with the driving gear, and the driving gear drives the left driving gear and the right driving gear to rotate synchronously. The right spiral rod and the left spiral rod are both arranged on the screw frame. The left driving gear is connected to the left spiral rod, and the right driving gear is connected to the right spiral rod. The right spiral rod and the left spiral rod are symmetrically arranged. After the square bar passes through the rotating shaft sleeve, it passes through the gap between the axis directions of the right spiral rod and the left spiral rod.

5. The friction stir additive continuous rod feeding mechanism according to claim 4, characterized in that: The right spiral rod and the left spiral rod are both arranged in a conical shape, and the diameters of the right spiral rod and the left spiral rod gradually increase from the spiral support mechanism to the main shaft. The square rod is connected with the threads on the outer walls of the right spiral rod and the left spiral rod, and the square rod is moved and fed from the spiral support mechanism to the main shaft under the action of the spiral rotation force of the right spiral rod and the left spiral rod.

6. The friction stir additive continuous rod feeding mechanism according to claim 5, characterized in that: The screw frame is a rectangular frame, and a left bearing and a right bearing are arranged on the screw frame. The rotating shafts at both ends of the right screw rod are arranged on the screw frame through the right bearing, and the rotating shafts at both ends of the left screw rod are arranged on the screw frame through the left bearing.

7. The friction stir additive continuous rod feeding mechanism according to claim 6, characterized in that: The outer walls of the right and left spiral rods are both provided with threads, and the spiral angles of the right and left spiral rods are the same, and the spiral angles of the right and left spiral rods are smaller than the self-locking angles of the right and left spiral rods.

8. The friction stir additive continuous rod feeding mechanism according to claim 7, characterized in that: The screw frame is provided with a third bearing, and the rotating shaft sleeve is connected to the screw frame via the third bearing.

9. The friction stir additive continuous rod feeding mechanism according to claim 4, characterized in that: The spiral support mechanism comprises a spiral support frame and a spiral support bearing. The spiral support frame is in the shape of a U-shaped plate. The spiral continuous feeding mechanism is located in the U-shaped groove of the spiral support frame. The spiral support bearing is arranged on the middle crossbeam of the spiral support frame.

10. The friction stir additive continuous rod feeding mechanism according to claim 9, characterized in that: The rotating shaft sleeve is connected with the spiral support frame through a spiral support bearing.

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