Pretreatment processing machine tool for rapid forming part

Abstract

The invention belongs to the technical field of metal processing machine tool equipment, and particularly relates to a pretreatment processing machine tool for rapid forming parts, which comprises an outer frame, a roller and a rotating platform, the two ends of the roller are respectively arranged in the frame through a rotary supporting mechanism, and the roller is driven to rotate by an overturning power system; and the rotating platform is mounted in the roller, is used for fixing a workpiece and is driven by a rotating power system to rotate. The integral structure is more compact, the internal space is maximized, the occupied space is small, and the sealing performance is good. And the roller and the rotating platform can be controlled according to the direction of a flow channel pipeline in a workpiece to carry out overturning and rotating angle setting, so that internal powder flows out orderly according to a sequence, and certain intelligence is achieved. The equipment is low in overall energy consumption, simple, stable and firm in structure and low in failure rate.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing machine tool equipment, and in particular relates to a pre-processing machine tool for rapid prototyping parts. Background Art

[0002] Selective laser melting (SLM) is popular in metal 3D printing. It first spreads a layer of metal powder on the printing platform, and the laser beam sintered on the powder layer according to the cross-sectional contour of the layer. When one layer of cross section is sintered, the printing platform will drop one layer thickness, and then evenly spread another layer of powder and start sintering a new layer of cross section. This operation is repeated until the workpiece is completely formed. During the forming process, the unsintered powder supports the cavity and cantilever of the model. Therefore, the advantage of this process is that the workpiece does not need a support structure, but the problem that comes with it is that the powder inside its structure is difficult to remove, especially the more complex the internal structure of the workpiece, the more difficult it is to remove. Post-processing often requires manual or tooling to remove the powder bit by bit: smaller printed workpieces can be suspended at various angles and knocked to basically remove the internal powder, but manual work is time-consuming and inefficient; medium-sized printed workpieces require the use of large tooling for powder cleaning. Currently, most of the tools on the market use cradle-structured tooling similar to the principle of positioners to vibrate and impact to clean the powder. There is a certain degree of automation in the market, but the efficiency is still low, and the overall structure is unreasonable. It is basically in an era of customized tooling.

[0003] Due to the advancement of printing technology, in order to avoid defects caused by manual welding in the later stage, the workpieces currently printed tend to be printed as a whole. In this way, the workpiece volume becomes larger and larger, the weight becomes heavier, and the added value becomes higher and higher. The internal structure of such parts is often very complex, full of various flow channels and pipelines. This brings great difficulty to the later cleaning of powder inside the printed workpiece: when cleaning the workpiece, the workpiece needs to be tilted and rotated to a certain angle, first pour out the powder at the opening of the flow channel; then tilt and rotate to a certain angle, and pour the powder near the inside from the inside of the flow channel to the opening little by little; and so on.

[0004] For large-scale printing workpieces, such as about 1.5 meters or even larger and heavier, using a cradle-like structure tooling to clean powder frequently exposes some problems: Since the cradle structure of the positioner principle is an eccentric structure, during the flipping or rotation process, a certain position needs to bear several times the force of other positions. If all working positions are to be stable and reliable, the overall structure of the cradle must be made larger and stronger to withstand the weight of large workpieces. In addition, during the powder cleaning process, there will be constant impact and vibration. Once the connection parts of the tooling are damaged or fall off, it will bring immeasurable losses. At the same time, the power drive energy consumption will also increase exponentially. The positioning of various angles is also rotated in a clockwise or counterclockwise order, which does not conform to the directionality of the flow channel pipeline inside the workpiece. It is very blind and random, and very time-consuming; there is even a possibility that the powder cannot be discharged if the flipping or rotation angle of the workpiece is not in the right order. The larger internal space also greatly reduces the overall pressure resistance and air tightness. In addition, 3D printing materials are generally metal powders such as iron, titanium, and aluminum, which are explosive, so the relevant complete sets of equipment must have a certain degree of explosion-proof properties - there must be no electrical appliances inside or explosion-proof appliances must be used; it must be filled with inert gas during operation. However, since the internal space of traditional powder cleaning tools is generally a square structure with many internal joint gaps, the overall sealing and pressure resistance are worrying. Therefore, this tooling structure is not suitable for large-scale printed workpieces. Summary of the invention

[0005] The purpose of the present invention is to provide a pre-processing machine tool for rapid prototyping parts to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a pre-processing machine tool for rapid prototyping parts, comprising an outer frame, a drum and a rotating platform, wherein both ends of the drum are respectively installed in the frame through a slewing support mechanism, the drum is driven to rotate by a flipping power system, the rotating platform is installed in the drum, the rotating platform is used to fix the workpiece, and the rotating platform is driven to rotate by the rotating power system.

[0007] Preferably, the slewing support mechanism includes a front slewing support mechanism and a rear slewing support mechanism, the front slewing support mechanism includes a front slewing support outer ring gear and a front slewing support inner ring, the front slewing support inner ring is fixedly connected to the outer frame, the front slewing support outer ring gear is fixed on the drum and slidingly cooperates with the front slewing support inner ring, the rear slewing support mechanism includes a rear slewing support outer ring gear, a rear slewing support inner ring and a rear slewing support middle ring, the rear slewing support inner ring is fixedly connected to the outer frame, the rear slewing support middle ring is fixedly connected to the drum, and the rear slewing support outer ring gear is slewingly cooperated with the rear slewing support middle ring.

[0008] Preferably, the drum is composed of a plurality of keels and a stainless steel shell, the two ends of the keel are respectively connected to the front slewing support outer ring gear and the rear slewing support middle ring and fixedly connected, and the cylindrical stainless steel shell is enclosed on the outside of the keel.

[0009] Preferably, the rotating platform includes a platform body, a driven gear, a transition gear and a gear bracket, the gear bracket is fixed on the keel, a rotating shaft is fixed at the lower part of the platform body, the driven gear is fixed on the rotating shaft, the lower part of the rotating shaft is connected to the gear bracket through a bearing, the transition gear is installed on the gear bracket, one side of the transition gear is meshed with the driven gear, and the other side of the transition gear is meshed with the outer ring gear of the rear slewing support.

[0010] Preferably, the rotating platform is an omnidirectional vibration isolation structure with a vibration block installed inside. The workpiece is connected to the rotating platform through a quick interface. The impact force of the vibration block acts on the workpiece. The vibration isolation structure isolates the impact force within the rotating platform, and other external structures are not damaged by the impact force.

[0011] Preferably, the platform body is composed of a shell, a vibration isolation block and a support plate, the middle portion of the support plate is fixedly connected to the rotating shaft, and the upper and lower sides of the support plate are installed inside the shell through the vibration isolation block.

[0012] Preferably, sealing doors are slidably connected to both sides of the outer frame.

[0013] Preferably, a loading and unloading platform mechanism is provided on one side of the outer frame, and the loading and unloading platform mechanism comprises a loading and unloading platform, a loading and unloading platform bracket, and a loading and unloading platform guide rail, and the loading and unloading platform is slidably connected to the loading and unloading platform bracket via the loading and unloading platform guide rail.

[0014] Preferably, the flipping power system and the rotation power system are respectively composed of a driving motor and a driving gear connected thereto.

[0015] Preferably, the rear slewing support outer ring gear is composed of flat teeth and helical teeth, the flat teeth are meshed with the rotary power system, and the helical teeth are meshed with the transition gear.

[0016] The beneficial effects of the present invention are as follows: the overall structure of the present invention is more compact, the internal space is maximized, the space occupied is small, and the sealing performance is good. There is no electrical connection in the working space, and the round door and the cylindrical drum shell have good pressure resistance and sealing properties, which largely eliminate the possibility of powder dust storms. The roller and the rotating platform can be controlled to flip and rotate at an angle according to the direction of the internal flow channel of the workpiece, so that the internal powder can flow out in order, and it has a certain degree of intelligence. The overall energy consumption of the equipment is low, the structure is simple, stable and firm, and the failure rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a directional stereogram of the present invention; Figure 2 It is a partial enlarged view of the front slewing support mechanism in the present invention; Figure 3 A three-dimensional diagram of another direction of the present invention; Figure 4 It is a partial enlarged view of the rear slewing support mechanism of the present invention; Figure 5 It is a bottom-up perspective view of the present invention; Figure 6 It is a partial enlarged view of the rotating platform in the present invention; Figure 7 It is a position diagram of the loading and unloading platform mechanism in the present invention; Figure 8 It is a side schematic diagram of the loading and unloading platform in the present invention; Fig. 9 It is a schematic diagram of fixing the substrate of the workpiece on the rotating platform in the present invention; Fig.10 This is a diagram of the installation position of the powder storage bin in the present invention; In the figure: 1, outer frame; 11, sealing door; 2, roller; 21, keel; 22, stainless steel shell; 3, rotating platform; 31, platform body; 311, shell; 312, vibration isolation block; 313, support plate; 32, driven gear; 33, transition gear; 34, gear bracket; 4, flip power system; 41, drive motor; 42, drive gear; 5, workpiece; 51, base plate; 6, rotating power system; 7, front slewing support Mechanism; 71, front rotary support outer ring gear; 72, front rotary support inner ring; 8, rear rotary support mechanism; 81, rear rotary support outer ring gear; 82, rear rotary support inner ring; 83, rear rotary support middle ring; 9, loading and unloading platform mechanism; 91, loading and unloading platform; 92, loading and unloading platform bracket; 93, loading and unloading platform guide rail; 94, push rod; 95, lower fork arm; 96, slot; 97, rotating screw; 10, powder storage bin; 101, slit. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fixed connection" and "fixed connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0021] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0022] like Figure 1 As shown, a pre-processing machine tool for rapid prototyping parts includes an outer frame 1, a drum 2 and a rotating platform 3. The two ends of the drum are respectively installed in the frame through a slewing support mechanism. The drum is driven to rotate by a turning power system 4 to drive the drum to turn over as a whole. The rotating platform is installed in the drum, and the rotating platform is used to fix the workpiece 5. The rotating platform is driven to rotate by a rotating power system 6 to drive the rotating platform inside the drum to rotate.

[0023] like Figure 1-4As shown, the slewing support mechanism includes a front slewing support mechanism 7 and a rear slewing support mechanism 8, the front slewing support mechanism includes a front slewing support outer ring gear 71 and a front slewing support inner ring 72, the front slewing support inner ring is fixedly connected to the outer frame, the front slewing support outer ring gear is fixed on the drum and slidably cooperates with the front slewing support inner ring, the rear slewing support mechanism includes a rear slewing support outer ring gear 81, a rear slewing support inner ring 82 and a rear slewing support middle ring 83, the rear slewing support inner ring is fixedly connected to the outer frame, the rear slewing support middle ring is fixedly connected to the drum, and the rear slewing support outer ring gear is slewingly cooperated with the rear slewing support middle ring. Specifically, the rear slewing support outer ring gear is composed of flat teeth and helical teeth, the flat teeth are meshed with the rotary power system, and the helical teeth are meshed with the transition gear.

[0024] Specifically, the drum 2 is composed of a plurality of keels 21 and a stainless steel shell 22. The two ends of the keels are respectively connected to the front slewing support outer ring gear 71 and the rear slewing support middle ring 83, and the cylindrical stainless steel shell is enclosed on the outside of the keels.

[0025] like Figure 6 As shown, the rotating platform 3 includes a platform body 31, a driven gear 32, a transition gear 33 and a gear bracket 34. The gear bracket is fixed on the keel. A rotating shaft 35 is fixed to the lower part of the platform body. The driven gear is fixed on the rotating shaft. The lower part of the rotating shaft is connected to the gear bracket through a bearing. The transition gear is installed on the gear bracket. One side of the transition gear is meshed with the driven gear, and the other side of the transition gear is meshed with the outer ring gear of the rear slewing support.

[0026] like Figure 6As shown, the rotating platform is an all-round vibration isolation structure, with a vibration block installed inside. The workpiece is connected to the rotating platform through a quick interface. The knocking force of the vibration block acts on the workpiece. The vibration isolation structure isolates the knocking force within the rotating platform, and other external structures are not damaged by the knocking force. Specifically, the platform body is composed of a shell 311, a vibration isolation block 312 and a support plate 313. The middle part of the support plate is fixed to the rotating shaft, and the upper and lower sides of the support plate are installed inside the shell through the vibration isolation block. A vibration source is fixed inside or outside the shell of the rotating platform, so that the vibration source drives the shell and the workpiece to vibrate together to clean the surface and internal powder. At the same time, the support plate isolated by the vibration isolation block is not affected by the vibration and can work stably for a long time. On the one hand, the shell wraps the support plate and the vibration isolation block as a whole, and a quick interface can be installed. The vibration isolation block is composed of rubber screws. The support plate is inside, and the shell is outside. The upper and lower interlayers of the support plate and the shell are connected by rubber screws according to a certain distribution. When the rotating platform is at any angle, such as horizontal, tilted, or inverted, there is always a part of the rubber screws in a compressed state and a part in a stretched state, so that the rubber screws can support a certain weight and also have a vibration isolation effect. The vibration isolation requirements of workpieces of different weights can be met by properly adjusting the number and size of the vibration isolation blocks.

[0027] Specifically, the two sides of the outer frame 1 are slidably connected with sealed doors 11. The front and rear sides of the drum can be opened, that is, the fixed inner rings of the front and rear slewing supports are used as door frames. The front side can be equipped with a sealed door, and the rear side sealed door can be equipped with a number of sensors, air ports, air inlets and other devices.

[0028] like Figure 7 As shown, a loading and unloading platform mechanism 9 is provided on one side of the outer frame, and the loading and unloading platform mechanism includes a loading and unloading platform 91, a loading and unloading platform bracket 92, and a loading and unloading platform guide rail 93. The loading and unloading platform is slidably connected to the loading and unloading platform bracket through the loading and unloading platform guide rail. There is a low loading and unloading platform in front of the entire main rotating structure for placing workpieces. When the workpiece is in place, the top layer of the loading and unloading platform can move horizontally and dock with the rotating platform inside the drum. After docking, as shown in FIG. Figure 8 and Fig. 9As shown, the workpiece is pushed to the rotating platform by the push rod 94 under the loading and unloading platform. The push rod installed under the loading and unloading platform is generally a multi-section telescopic structure, which can be a hydraulic push rod or an electric push rod. The tail end of the push rod is fixed to the loading and unloading platform, and the top of the push rod is connected to a fork arm 95, which is supported on the substrate of the 3D printed workpiece. After the loading and unloading platform is docked with the rotating platform, the push rod is started, and the fork arm 95 driven by the push rod pushes the workpiece 5 to move above the rotating platform. A pair of card slots 96 are installed above the rotating platform. The card slot is a concave structure with a wide top and a narrow bottom. The substrate 51 of the workpiece 5 can just be stuck in the card slot. The card slot has a screw hole, and the rotating screw 97 locks the card slot with the substrate through the screw hole. The sealing door is closed, and the workpiece starts to automatically clean the powder. When the workpiece completes the automatic powder cleaning, the sealing door is opened, the loading and unloading platform moves horizontally to dock with the rotating platform, the rotating screw is unlocked, and the workpiece is pulled back to the loading and unloading platform, and then the next step of process treatment is performed on it.

[0029] The smooth stainless steel inner wall of the drum ensures that the powder is always at the bottom when the drum rotates. When the drum flips to the initial position, the powder flows from the root of the rotating platform into the powder storage bin 10, and the powder can be recycled. Fig.10 As shown, specifically, a slit 101 is opened at any edge of the drum (optionally near the rotating platform), and the outer side of the slit is sealed and connected to a powder storage bin. When the powder passes through the slit, it leaks from the slit to the powder storage bin. Since the slit is very narrow, the probability of the powder in the powder storage bin returning to the drum is very low, which plays a role of storage. Multiple powder storage bins can also be set on the drum.

[0030] In the present invention, the flipping power system and the rotating power system are respectively composed of a driving motor 41 and a driving gear 42 connected thereto. By adjusting the speed of the two power systems respectively, different flipping and rotating speeds can be achieved.

[0031] Assuming that the flow channel of the workpiece is spring-shaped, first take the powder outlet as the zero point, flip and rotate the workpiece so that the tangent direction of the powder outlet is vertically downward, so that the powder at the initial powder outlet end can be discharged. Then flip and rotate the workpiece so that the tangent direction of the flow channel at the rear end of the powder outlet is vertically downward, and discharge this part of the powder to the powder outlet end; the workpiece returns to the position of the first step, and the powder just discharged to the outlet end is discharged out of the outlet. By analogy, divide a whole section of the flow channel into several sections, and repeat the previous action in each section to discharge the powder in sequence. The program can set the length of each segmented flow channel and the number of repetitions, so as to target the flow channel of different workpieces, so that the powder cleaning work can be carried out effectively.

[0032] The above program can be pre-edited offline according to the three-dimensional graphics of the workpiece to determine the angle position of the roller and the rotating platform at each step, and then the equipment automatically executes each step according to the trajectory. It can also be manually taught and edited step by step, and the angle position of each section of the flow channel pipeline is manually saved. When running, it will be executed in the order saved.

[0033] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A pre-processing machine tool for rapid prototyping parts, characterized in that: It includes an outer frame, a roller and a rotating platform, the two ends of the roller are respectively installed in the frame through a slewing support mechanism, the roller is driven to rotate by a turning power system, the rotating platform is installed in the roller, the rotating platform is used to fix the workpiece, and the rotating platform is driven to rotate by the rotating power system; The slewing support mechanism includes a front slewing support mechanism and a rear slewing support mechanism, the front slewing support mechanism includes a front slewing support outer ring gear and a front slewing support inner ring, the front slewing support inner ring is fixedly connected to the outer frame, the front slewing support outer ring gear is fixed on the roller and slidably cooperates with the front slewing support inner ring, the rear slewing support mechanism includes a rear slewing support outer ring gear, a rear slewing support inner ring and a rear slewing support middle ring, the rear slewing support inner ring is fixedly connected to the outer frame, the rear slewing support middle ring is fixedly connected to the roller, and the rear slewing support outer ring gear slidably cooperates with the rear slewing support middle ring.

2. The rapid prototyping parts pretreatment machine tool according to claim 1, characterized in that: The drum is composed of a plurality of keels and a stainless steel shell. The two ends of the keel are respectively connected to the front slewing support outer ring gear and the rear slewing support middle ring for fixed connection. The cylindrical stainless steel shell is closed on the outside of the keel.

3. The rapid prototyping parts pretreatment machine tool according to claim 2, characterized in that: The rotating platform includes a platform body, a driven gear, a transition gear and a gear bracket. The gear bracket is fixed on the keel. A rotating shaft is fixed to the lower part of the platform body. The driven gear is fixed on the rotating shaft. The lower part of the rotating shaft is connected to the gear bracket through a bearing. The transition gear is installed on the gear bracket. One side of the transition gear is meshed with the driven gear, and the other side of the transition gear is meshed with the outer ring gear of the rear slewing support.

4. The rapid prototyping parts pre-processing machine tool according to claim 3, characterized in that: The rotating platform is an all-round vibration isolation structure with a vibration block installed inside. The workpiece is connected to the rotating platform through a quick interface. The impact force of the vibration block acts on the workpiece. The vibration isolation structure isolates the impact force within the rotating platform, and other external structures are not damaged by the impact force.

5. The rapid prototyping parts pre-processing machine tool according to claim 4, characterized in that: The platform body is composed of a shell, a vibration isolation block and a support plate. The middle part of the support plate is fixedly connected to the rotating shaft, and the upper and lower sides of the support plate are installed inside the shell through the vibration isolation block.

6. The rapid prototyping parts pre-processing machine tool according to claim 1, characterized in that: Sealed doors are slidably connected to both sides of the outer frame.

7. The rapid prototyping parts pre-processing machine tool according to claim 1, characterized in that: A loading and unloading platform mechanism is provided on one side of the outer frame. The loading and unloading platform mechanism comprises a loading and unloading platform, a loading and unloading platform bracket, and a loading and unloading platform guide rail. The loading and unloading platform is slidably connected to the loading and unloading platform bracket via the loading and unloading platform guide rail.

8. The rapid prototyping parts pre-processing machine tool according to claim 1, characterized in that: The turning power system and the rotating power system are respectively composed of a driving motor and a driving gear connected thereto.

9. The rapid prototyping parts pre-processing machine tool according to claim 1, characterized in that: The outer ring gear of the rear slewing support is composed of flat teeth and helical teeth, the flat teeth are meshed with the rotary power system, and the helical teeth are meshed with the transition gears; the inner ring of the front slewing support is used as a door frame to install a front sealing door for the workpiece to enter and exit; the inner ring of the rear slewing support is used as a door frame to install a sealing door on the rear side to assist the workpiece to enter and exit, or to install a number of sensors, air ports and air inlet devices to provide parameters based on automation and intelligence.

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