A friction stir additive manufacturing continuous rod feeding mechanism

Abstract

The application relates to a friction stir additive continuous rod feeding mechanism, which comprises a spiral supporting mechanism, a spiral continuous feeding mechanism, a rotary driving mechanism, a main shaft and a square rod; the spiral continuous feeding mechanism can rotate as a whole under the driving of the rotary driving mechanism inside the spiral supporting mechanism; the square rod penetrates through the spiral supporting mechanism, the spiral continuous feeding mechanism and the main shaft; when the spiral continuous feeding mechanism rotates as a whole, the square rod is driven to rotate and is conveyed into the main shaft. The friction stir additive continuous rod feeding mechanism adopts a spiral transmission mechanism to continuously drive the square rod and bear the upsetting force in the additive process. Two spiral rods with the same shape are adopted, the distance between the two spiral rods is slightly smaller than the width size of the square rod, the spiral rod is conical in the outer envelope size, the spiral rod teeth can slowly cut into the rod, and the axial driving of the rod is realized by utilizing the shearing force formed at the cutting part of the rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding technology, in particular to a friction stir additive continuous rod feeding mechanism. BACKGROUND

[0002] Additive manufacturing is a way of manufacturing physical parts by layering manufacturing, layer by layer, compared with traditional casting, welding and other processing methods, it has the advantages of high efficiency, fast and so on. Especially for complex and precise structure processing, it has high flexibility and adaptability. The commonly used additive technology at present mainly includes laser powder sintering additive, electron beam powder sintering additive, fused deposition modeling additive, friction stir solid additive and other methods.

[0003] Friction stir additive technology is a new type of 3D additive technology, which mainly uses bar or wire as raw material, that is, "friction stir deposition additive". It is a solid-phase additive technology developed on the basis of friction stir welding, which is a processing method that generates friction heat by high-speed extrusion friction between friction stir tool and cladding material, and then accumulates and diffuses the cladding material layer by layer to form a connection. It avoids defects such as solidification shrinkage, thermal cracks, pores and other defects, and is a high-efficiency, low-defect-rate additive process. The existing friction stir additive processing mainly uses metal rods, metal wires and metal particles as cladding materials.

[0004] When the cladding material is in the form of metal rod: the rod is clamped in the spindle of the machine tool, and in the processing process, the rod and the spindle rotate synchronously at high speed, and the lower end surface of the rod is in contact with the metal of the substrate for extrusion, realizing additive manufacturing. This method has a relatively simple equipment structure, the rod needs to be pre-clamped in the spindle, and continuous feeding cannot be realized during processing. Moreover, the length of the rod is limited by factors such as equipment size and driving force, and continuous processing cannot be realized. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the problem of the rod additive technology in the existing friction stir solid-phase additive technology, which is more focused on non-continuous feeding additive, and has the problems of low additive efficiency and large structure size.

[0006] To solve the above technical problems, the application provides a continuous rod feeding mechanism for friction stir additive manufacturing, which comprises a spiral supporting mechanism, a spiral continuous feeding mechanism, a rotary driving mechanism, a main shaft and a square bar; wherein the spiral supporting mechanism is a supporting component, the main shaft is fixedly connected with the spiral supporting mechanism, the spiral continuous feeding mechanism is arranged on the spiral supporting mechanism and located at the side of the main shaft along the feeding direction of the square bar, the rotary driving mechanism is connected with the spiral continuous feeding mechanism, the spiral continuous feeding mechanism can rotate as a whole under the driving of the rotary driving mechanism, and the square bar penetrates through the spiral supporting mechanism, the spiral continuous feeding mechanism and the main shaft.

[0007] In an embodiment of the application, the rotary driving mechanism comprises a driving driven wheel, a driving belt, a driving driving wheel and a driving motor, the rotating shaft of the driving motor is connected with the driving driving wheel, the driving belt is sleeved on the driving driven wheel and the driving driving wheel, the driving driving wheel is driven to rotate by the driving belt, and the driving driven wheel is connected with the main shaft.

[0008] In an embodiment of the application, the main shaft comprises a main shaft body, an additive tool holder and a main shaft core, the main shaft body is fixedly connected with one end of the spiral supporting mechanism, the main shaft core is arranged in the main shaft body, one end of the main shaft core is fixedly connected with the driving driven wheel, the additive tool holder is arranged on the other end of the main shaft core away from the driving driven wheel, and the square bar penetrates through the main shaft core and is discharged from the additive tool holder.

[0009] In an embodiment of the application, the spiral continuous feeding mechanism comprises a driving gear, a left driving gear, a right screw rod, a left screw rod, a screw frame, a lower main shaft connecting plate, a rotating shaft sleeve and a right driving gear, the lower main shaft connecting plate is connected with the main shaft core and can rotate synchronously with the main shaft core, the lower main shaft connecting plate is fixedly connected with the screw frame, the rotating shaft sleeve is connected with the screw frame, the driving gear is sleeved on the rotating shaft sleeve and can rotate synchronously with the screw frame, the left driving gear and the right driving gear are engaged with the driving gear and driven to rotate synchronously by the driving gear, the right screw rod and the left screw rod are arranged on the screw frame, the left driving gear is connected with the left screw rod, the right driving gear is connected with the right screw rod, the right screw rod and the left screw rod are symmetrically arranged, and the square bar penetrates through the gap between the axis directions of the right screw rod and the left screw rod after penetrating through the rotating shaft sleeve.

[0010] In one embodiment of the present application, the right screw rod and the left screw rod are both arranged in a tapered manner, and the diameters of the right screw rod and the left screw rod gradually increase in the direction from the screw supporting mechanism to the main shaft, the square bar is in contact with the threads on the outer walls of the right screw rod and the left screw rod, and the square bar moves in the direction from the screw supporting mechanism to the main shaft under the action of the screw rotation force of the right screw rod and the left screw rod.

[0011] In one embodiment of the present application, the screw rod frame is a rectangular frame, and the screw rod frame is provided with a left bearing and a right bearing, the rotating shafts at the two ends of the right screw rod are arranged on the screw rod frame through the right bearing, and the rotating shafts at the two ends of the left screw rod are arranged on the screw rod frame through the left bearing. The bearings installed at the two ends of the right screw rod and the left screw rod can bear axial force, meeting the conventional additive use.

[0012] In one embodiment of the present application, the outer walls of the right screw rod and the left screw rod are both provided with threads, and the helix angles of the right screw rod and the left screw rod are the same, and the helix angles of the right screw rod and the left screw rod are smaller than the self-locking angles of the right screw rod and the left screw rod. The helix angles of the right screw rod and the left screw rod are smaller than the self-locking angles, so that the bar can be self-locked once it enters, and sufficient axial force can be provided.

[0013] In one embodiment of the present application, the screw rod frame is provided with a bearing three, and the rotating shaft sleeve is connected with the screw rod frame through the bearing three.

[0014] In one embodiment of the present application, the screw supporting mechanism comprises a screw supporting frame and a screw supporting bearing, the screw supporting frame is a U-shaped plate, the screw continuous feeding mechanism is located in the U-shaped groove of the screw supporting frame, and the screw supporting bearing is arranged on the middle cross beam of the screw supporting frame.

[0015] In one embodiment of the present application, the rotating shaft sleeve is connected with the screw supporting frame through the screw supporting bearing.

[0016] The above technical solution of the present application has the following beneficial effects compared with the prior art:

[0017] The continuous bar feeding mechanism for friction stir additive manufacturing disclosed in the present application adopts a screw transmission mechanism to realize continuous driving of the square bar and to bear the upsetting force in the additive manufacturing process. The mechanism adopts two identical screw rods, the distance between the two screw rods is slightly smaller than the width size of the square bar, the screw rod is tapered in the outer envelope size, the screw rod teeth can slowly cut into the bar, and the shear force formed at the cutting part of the bar is used to realize the axial driving of the bar.

[0018] The continuous bar feeding mechanism for friction stir additive manufacturing has the following advantages:

[0019] 1. The continuous feeding of the bar material is completed by the screw mechanism, which can realize infinite continuity and has simple structure;

[0020] 2. The square bar material is used as the raw material of the continuous feeding mechanism, which avoids the relative rotation of the bar material after entering the main shaft, thereby avoiding the inconsistent situation between the rotation speed of the bar material and the additive tool;

[0021] 3. The screw mechanism has self-locking ability while conveying the bar material, thereby providing sufficient axial force of the bar material additive. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in conjunction with the drawings, in which

[0023] Figure 1 is the overall assembly view of the continuous bar feeding mechanism of the friction stir additive in the preferred embodiment of the application;

[0024] Figure 2 is the sectional view of the continuous bar feeding mechanism of the friction stir additive in the preferred embodiment of the application Figure One .

[0025] Figure 3 is the partial structural schematic view of the continuous bar feeding mechanism of the friction stir additive in the preferred embodiment of the application;

[0026] Figure 4 is the sectional view of the continuous bar feeding mechanism of the friction stir additive in the preferred embodiment of the application Figure Two .

[0027] DESCRIPTION OF DRAWINGS 1. Screw support mechanism, 101. Screw support frame, 102. Screw support bearing, 2. Screw continuous feeding mechanism, 201. Driving gear, 202. Driving gear, 203. Left bearing, 204. Right screw rod, 205. Left screw rod, 206. Screw rod frame, 207. Lower main shaft connecting plate, 208. Shaft sleeve, 209. Right driving gear, 2010. Right bearing, 2011. Bearing three, 3. Rotating driving mechanism, 301. Driving driven wheel, 302. Driving belt, 303. Driving driving wheel, 304. Driving motor, 4. Main shaft, 401. Main shaft body, 402. Additive tool, 403. Main shaft core, 5. Square bar material. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the application and implement it, but the embodiments are not limiting the application.

[0029] REFERENCE Figures 1-4The continuous bar feeding mechanism of the friction stir additive manufacturing shown comprises a spiral supporting mechanism 1, a spiral continuous feeding mechanism 2, a rotary driving mechanism 3, a main shaft 4 and a square bar 5; wherein the spiral supporting mechanism 1 is a supporting component, and the main shaft 4 and the spiral supporting mechanism 1 are fixedly connected, the spiral continuous feeding mechanism 2 is arranged on the spiral supporting mechanism 1, and the spiral continuous feeding mechanism 2 is located on the side of the main shaft 4 along the feeding of the square bar 5, the rotary driving mechanism 3 is connected with the spiral continuous feeding mechanism 2, and the spiral continuous feeding mechanism 2 can rotate as a whole under the driving of the rotary driving mechanism 3 inside the spiral supporting mechanism 1, and the square bar 5 penetrates the spiral supporting mechanism 1, the spiral continuous feeding mechanism 2 and the main shaft 4, and when the spiral continuous feeding mechanism 2 rotates as a whole, the square bar 5 is driven to rotate and conveyed into the main shaft 4. The square bar 5 enters the spiral continuous feeding mechanism 2 from the spiral supporting mechanism 1, and under the transmission of the spiral continuous feeding mechanism 2, enters the main shaft 4.

[0030] In the above structure, the rotary driving mechanism 3 comprises 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 with 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 with the main shaft 4.

[0031] In the above structure, the main shaft 4 comprises a main shaft body 401, an additive tool holder 402 and a main shaft arbor 403, the main shaft body 401 is fixedly connected with one end of the spiral supporting mechanism 1, the main shaft arbor 403 is arranged inside the main shaft body 401, one end of the main shaft arbor 403 is fixedly connected with the driving driven wheel 301, the additive tool holder 402 is arranged on the other end of the main shaft arbor 403 away from the driving driven wheel 301, and the square bar 5 penetrates the main shaft arbor 403 and is discharged from the additive tool holder 402. The driving driven wheel 301 is sleeved on one end of the main shaft arbor 403, and the main shaft arbor 403 is coaxially arranged with the driving driven wheel 301, and the main shaft arbor 403 rotates synchronously with the driving driven wheel 301. When the rotary driving mechanism 3 operates, the main shaft arbor 403 and the spiral continuous feeding mechanism 2 rotate.

[0032] In the structure, the screw continuous feeding mechanism 2 comprises a driving gear 201, a left driving gear 202, a right screw rod 204, a left screw rod 205, a screw rod 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 with the spindle core shaft 403 and can rotate synchronously with the spindle core shaft 403, the lower spindle connecting plate 207 is fixedly connected with the screw rod frame 206, the rotating shaft sleeve 208 is connected on the screw rod frame 206, the driving gear 201 is sleeved on the rotating shaft sleeve 208 and can rotate synchronously with the screw rod frame 206, the left driving gear 202 and the right driving gear 209 are engaged with the driving gear 201 and are driven by the driving gear 201 to rotate synchronously, the right screw rod 204 and the left screw rod 205 are arranged on the screw rod frame 206, the left driving gear 202 is connected with the left screw rod 205, the right driving gear 209 is connected with 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 rotating shaft sleeve 208 and then passes through the gap between the axial directions of the right screw rod 204 and the left screw rod 205. The driving gear 201, the left driving gear 202 and the right driving gear 209 are arranged on the same straight line, and the left driving gear 202 and the right driving gear 209 are respectively arranged on the two sides of the driving gear 201, and the left driving gear 202 and the right driving gear 209 are symmetrically arranged on the two sides of the driving gear 201.

[0033] In the structure, the right screw rod 204 and the left screw rod 205 are both arranged in a tapered shape, the diameters of the right screw rod 204 and the left screw rod 205 gradually increase along the direction from the screw supporting mechanism 1 to the spindle 4, the square bar 5 is in contact with the threads on the outer walls of the right screw rod 204 and the left screw rod 205, and the square bar 5 moves in the direction from the screw supporting mechanism 1 to the spindle 4 under the action of the screw rotation force of the right screw rod 204 and the left screw rod 205.

[0034] In the structure, the screw rod frame 206 is a rectangular frame, left bearings 203 and right bearings 2010 are arranged on the screw rod frame 206, rotating shafts at the two ends of the right screw rod 204 are arranged on the screw rod frame 206 through the right bearings 2010, and rotating shafts at the two ends of the left screw rod 205 are arranged on the screw rod frame 206 through the left bearings 203. Threads are arranged on the outer walls of the right screw rod 204 and the left screw rod 205, and the screw angles of the right screw rod 204 and the left screw rod 205 are the same, the screw 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. Bearings three 2011 are arranged on the screw rod frame 206, and the rotating shaft sleeve 208 is connected with the screw rod frame 206 through the bearings three 2011.

[0035] In the structure, the spiral supporting mechanism 1 comprises a spiral supporting frame 101 and a spiral supporting bearing 102, the spiral supporting frame 101 is a U-shaped plate, the spiral continuous feeding mechanism 2 is located in the U-shaped groove of the spiral supporting frame 101, and the spiral supporting bearing 102 is arranged on the middle beam of the spiral supporting frame 101. The rotating shaft sleeve 208 is connected through the spiral supporting bearing 102 and the spiral supporting frame 101.

[0036] The driving gear 201 can be rotated through the external driving mechanism penetrating through the spiral supporting bearing 102 of the spiral supporting mechanism 1, the rotation of the main shaft gear 201 drives the left and right driving gears 202 to rotate, and the left driving gear 202 drives the right spiral rod 204 and the left spiral rod 205 to rotate.

[0037] 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 spiral driving action, the square bar 5 moves axially downward. The right spiral rod 204 and the left spiral rod 205 are designed in a conical shape, and the cutting of the square bar 5 is a slow process.

[0038] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A continuous rod feeding mechanism for friction stir additive manufacturing, characterized in that: include: Spiral support mechanism, spiral continuous feeding mechanism, rotary drive mechanism, main shaft and square bar stock; 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 set on the spiral support mechanism and is located on the side of the main shaft feeding along the square bar. 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 under the drive of the rotary drive mechanism. The square bar passes through the spiral support mechanism, the spiral continuous feeding mechanism and the main shaft. When the spiral continuous feeding mechanism rotates as a whole, it drives the square bar to rotate and be fed into the main shaft. The spiral continuous feeding mechanism includes a right spiral rod and a left spiral rod, both of which are tapered. The diameters of the right and left spiral rods gradually increase along the direction from the spiral support mechanism to the main shaft. The distance between the middle of the right and left spiral rods is less than the width of the square bar. The square bar is connected to the threads on the outer walls of the right and left spiral rods. Under the spiral rotational force of the right and left spiral rods, the square bar moves from the spiral support mechanism towards the main shaft for feeding. The spiral rod teeth can slowly cut into the bar, and the axial drive of the bar is achieved by utilizing the shearing force formed at the cut of the bar.

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

3. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 2, characterized in that: The spindle includes a spindle body, an additive tool holder, and a spindle mandrel. The spindle body is fixedly connected to one end of the spiral support mechanism. The spindle mandrel is located inside the spindle body, and one end of the spindle mandrel is fixedly connected to the drive driven wheel. The additive tool holder is located on the other end of the spindle mandrel away from the drive driven wheel. The square bar passes through the spindle mandrel and exits from the additive tool holder.

4. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 3, characterized in that: The spiral continuous feeding mechanism further includes a drive gear, a left drive gear, a screw frame, a lower main shaft connecting plate, a rotating shaft sleeve, and a right drive gear. The lower main shaft connecting plate is connected to the main shaft spindle and can rotate synchronously with the main shaft spindle. The lower main shaft connecting plate is fixedly connected to the screw frame. A rotating shaft sleeve is connected to the screw frame. The drive gear is sleeved on the rotating shaft sleeve, and the rotating shaft sleeve can rotate synchronously with the screw frame. Both the left and right drive gears mesh with the drive gear, and the drive gear drives the left and right drive gears to rotate synchronously. Both the right and left spiral rods are set on the screw frame. The left drive gear is connected to the left spiral rod, and the right drive gear is connected to the right spiral rod. The right and left spiral rods are symmetrically arranged. The square bar passes through the rotating shaft sleeve and then passes through the gap between the axes of the right and left spiral rods.

5. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 4, characterized in that: The screw frame is a rectangular frame, and a left bearing and a right bearing are provided on the screw frame. The shafts at both ends of the right screw are set on the screw frame through the right bearing, and the shafts at both ends of the left screw are set on the screw frame through the left bearing.

6. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 5, characterized in that: Both the right and left helical rods have threads on their outer walls, and the helix angles of the right and left helical rods are the same. The helix angles of the right and left helical rods are smaller than their self-locking angles.

7. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 6, characterized in that: The screw frame is provided with a bearing three, and the rotating shaft sleeve is connected to the screw frame through the bearing three.

8. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 4, characterized in that: The spiral support mechanism includes a spiral support frame and a spiral support bearing. The spiral support frame is U-shaped, the spiral continuous feeding mechanism is located in the U-shaped groove of the spiral support frame, and the spiral support bearing is set on the middle crossbeam of the spiral support frame.

9. The continuous rod feeding mechanism for friction stir additive manufacturing according to claim 8, characterized in that: The rotating shaft sleeve is connected by a helical support bearing and a helical support frame.

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