Shaping device for thin-wall part for 3D printing

Abstract

A shaping device for a 3D printed thin-walled workpiece comprises a bearing mechanism and a heating furnace, and the bearing mechanism comprises a lower shaping plate used for placing the 3D printed thin-walled workpiece; the pins are arranged on the lower shaping plate and located on the two sides of the thin-wall part so as to prevent the thin-wall part from moving in the horizontal direction; each spring is correspondingly arranged at the bottom of the corresponding pin and is embedded in the lower shaping plate; the upper shaping plate is positioned above the thin-wall part and is supported by a plurality of pins; the at least one balancing weight is placed on the upper shaping plate; the bearing mechanism is placed in the heating furnace, all the springs are in a failure state by heating the bearing mechanism, so that the upper shaping plate and the balancing weight are pressed to the thin-wall part under the action of gravity, the thin-wall part is shaped, the shaping force of the shaping device on the 3D printed thin-wall part is uniform, stable and controllable, the shaping time is shortened, and the shaping efficiency is improved. The shaping quality of the 3D printed thin-wall part is improved, and the product percent of pass reaches 90% or above.

Description

Technical Field

[0001] The utility model belongs to the technical field of additive manufacturing, and in particular relates to a shaping device for thin-walled parts used for 3D printing. Background Art

[0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Since it is not limited by the complexity of the part shape and does not require any tooling and molds, it has a very wide range of applications. As one of the additive manufacturing technologies, the selective laser sintering process has the following basic process: the powder feeding device delivers a certain amount of powder to the work surface, the powder spreading roller spreads a layer of powder material on the upper surface of the formed part of the forming cylinder, the heating device heats the powder to the set temperature, and the galvanometer system controls the laser to scan the solid part powder layer according to the cross-sectional profile of the layer, so that the powder melts and bonds with the formed part below; when a layer of cross section is sintered, the workbench drops a layer of thickness, and the powder spreading roller spreads a layer of uniform and dense powder on it, and scans and sinters a new layer of cross section, and after several layers of scanning and superposition, the entire prototype manufacturing is completed.

[0003] With the emergence of additive manufacturing technology, workpieces can be designed to be lightweight according to various structural types without reducing the mechanical properties of the workpiece, thereby achieving the goal of reducing the overall weight. Therefore, in some high-end equipment structures, a large number of thin-walled parts are used to reduce weight. However, in the process of metal 3D printing, due to the structural characteristics of the workpiece, temperature changes during sintering, expansion and contraction and other factors, the workpiece often causes deformation, especially thin-walled parts with poor rigidity and easy deformation. Usually, we can resist the deformation of the workpiece by adding support structures, but once the workpiece is removed from the substrate, it will be affected by the residual stress on the surface and sub-surface of the workpiece, resulting in secondary deformation. These workpieces are often key parts in the assembly and use of products, and their dimensional tolerances, form and position tolerances, and surface roughness are all required to be high. If the dimensional requirements are not met, it will affect the use of the workpiece and even cause the workpiece to be scrapped, resulting in great waste.

[0004] Usually, we will correct the deformed parts. At present, it is generally corrected by directly applying pressure to the printed parts manually or mechanically. However, this method is limited to the flat structure of the parts to be printed, and is not suitable for 3D printed thin-walled parts. This is because this correction method is prone to plastic failure or fracture failure of thin-walled parts due to improper clamping and improper manual force control. In addition, manual operation has low accuracy, so repeated correction is required, which consumes a lot of time. Utility Model Content

[0005] In order to solve the above-mentioned technical problems existing in the prior art, the utility model provides a shaping device for 3D printed thin-walled parts. The shaping device for 3D printed thin-walled parts has uniform, stable and controllable correction force for 3D printed thin-walled parts, which not only reduces the correction time and improves the shaping quality of 3D printed thin-walled parts, but also achieves a product qualification rate of more than 90%, which is more suitable for batch printing of parts.

[0006] In order to solve the above-mentioned technical problems, the utility model provides a shaping device for thin-walled parts for 3D printing, including a bearing mechanism and a heating furnace, wherein the bearing mechanism includes:

[0007] A lower shaping plate, which is used to place 3D printed thin-walled parts;

[0008] A plurality of pins are arranged on the lower shaping plate and located on both sides of the thin-walled part to prevent the thin-walled part from moving in the horizontal direction;

[0009] A plurality of springs, each spring being arranged at the bottom of a pin and embedded in the lower shaping plate;

[0010] an upper shaping plate, which is located above the thin-walled member and supported by a plurality of pins; and

[0011] At least one counterweight is placed on the upper shaping plate; wherein,

[0012] The bearing mechanism is placed in the heating furnace, and all springs are put into a failure state by heating the bearing mechanism, so that the upper shaping plate and the counterweight block are pressed onto the thin-walled part under the action of gravity to shape the thin-walled part.

[0013] As a further preferred embodiment of the present invention, the shaping device further comprises at least one guide column, which is fixedly mounted on the lower shaping plate, and through holes are provided on the upper shaping plate and the counterweight block to allow the guide column to be inserted.

[0014] As a further preferred embodiment of the present invention, there are two guide posts, which are symmetrically arranged on the lower shaping plate.

[0015] As a further preferred embodiment of the present invention, the plurality of pins are evenly and spaced apart on both sides of the thin-walled member, all the pins are identical, and the heights of the tops of all the pins are the same.

[0016] As a further preferred solution of the present invention, all springs are identical.

[0017] As a further preferred embodiment of the present invention, the distance between the bottom of the upper shaping plate and the highest point of the top of the thin-walled part is 0-0.2 mm.

[0018] As a further preferred embodiment of the present invention, the lower shaping plate, the upper shaping plate and the counterweight are made of titanium alloy.

[0019] As a further preferred embodiment of the present invention, the flatness of the lower surface of the upper shaping plate is ±0.02 mm.

[0020] As a further preferred embodiment of the present invention, the flatness of the upper surface of the lower shaping plate is ±0.02 mm.

[0021] As a further preferred embodiment of the present invention, the minimum spacing distance between the pin and the thin-walled part is 2 mm to 5 mm.

[0022] The utility model is a shaping device for 3D printed thin-walled parts, which comprises: a bearing mechanism and a heating furnace, wherein the bearing mechanism comprises: a lower shaping plate, which is used to place the 3D printed thin-walled parts; a plurality of pins, which are arranged on the lower shaping plate and located on both sides of the thin-walled parts to prevent the thin-walled parts from moving in the horizontal direction; a plurality of springs, each of which is correspondingly arranged at the bottom of a pin and embedded in the lower shaping plate; an upper shaping plate, which is located above the thin-walled parts and supported by a plurality of pins; and at least one counterweight, which is placed on the upper shaping plate. The shaping plate is placed in the heating furnace, and the bearing mechanism is heated to make all springs in a failed state, so that the upper shaping plate and the counterweight block are pressed to the thin-walled part under the action of gravity to shape the thin-walled part, so that the shaping device for 3D printed thin-walled parts of the utility model has a uniform, stable and controllable correction force on the 3D printed thin-walled parts, which not only reduces the correction time, but also improves the correction quality of the 3D printed thin-walled parts. The product qualification rate reaches more than 90%, which is more suitable for batch printing of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of an embodiment of the thin-walled part shaping device for 3D printing provided by the utility model;

[0024] Figure 2 A structural schematic diagram of an embodiment of the load-bearing mechanism of the utility model;

[0025] Figure 3 for Figure 2 Schematic diagram of the local structure;

[0026] Figure 4 for Figure 2 sectional view of .

[0027] The parts in the figure are marked as follows:

[0028] 1. Carrying mechanism, 2. Heating furnace, 11. Lower shaping plate, 12. Pin, 13. Spring, 14. Upper shaping plate, 15. Counterweight, 16. Fixed plate, 17. Guide column, 3. Thin-walled parts. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand and implement the technical solution of the utility model, further detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0030] The thin-walled part 3 in this application refers to a thin-walled pipe, and the ratio of the outer diameter to the inner diameter of the pipe is less than 1.2. Since the structure of the thin-walled part 3 formed by 3D printing itself has poor rigidity, it is easy to deform due to the accumulation of internal stress layer by layer after printing, and it is difficult to meet the size and use requirements. The conventional cold shaping currently used is easy to cause the workpiece to rebound or crack and lead to scrapping.

[0031] In order to solve the above technical problems existing in the prior art, the present application provides a shaping device for thin-walled parts for 3D printing, such as Figures 1 to 4 As shown, it includes a carrying mechanism 1 and a heating furnace 2, and the carrying mechanism 1 includes:

[0032] The lower shaping plate 11 is used for placing the 3D printed thin-walled parts 3; specifically, the lower shaping plate 11 is fixedly mounted on the fixing plate 16 by bolts; it should be noted that one or more thin-walled parts 3 can be placed on the lower shaping plate 11.

[0033] A plurality of pins 12 are arranged on the lower shaping plate 11 and located on both sides of the thin-walled member 3 to prevent the thin-walled member 3 from moving in the horizontal direction;

[0034] A plurality of springs 13, each spring 13 is correspondingly arranged at the bottom of a pin 12 and embedded in the lower shaping plate 11;

[0035] An upper shaping plate 14, which is located above the thin-walled member 3 and supported by a plurality of pins 12; and

[0036] At least one counterweight block 15 is placed on the upper shaping plate 14; it is understandable that the weight and quantity of the counterweight blocks 15 can be specifically selected according to the pressure required for shaping of the thin-walled part 3, and are not listed here one by one.

[0037] The bearing mechanism 1 is placed in the heating furnace 2, and all the springs 13 are in a failed state by heating the bearing mechanism 1, so that the upper shaping plate 14 and the counterweight block 15 are pressed to the thin-walled part 3 under the action of gravity to shape the thin-walled part 3. The specific temperature at which the spring 13 is heated to be in a failed state can be determined according to the material of the spring 13, for example, the heating temperature can reach 300 degrees.

[0038] In order to prevent the upper shaping plate 14 and the counterweight block 15 from moving in the horizontal direction, so as to achieve the positioning function. Preferably, the shaping device further comprises at least one guide column 17, which is fixedly mounted on the lower shaping plate 11, and the upper shaping plate 14 and the counterweight block 15 are both provided with through holes for the guide column 17 to be inserted. Specifically, Figures 1 to 4 As shown, there are two guide posts 17 symmetrically arranged on the lower shaping plate 11 .

[0039] In a specific implementation, the plurality of pins 12 are evenly and spaced apart on both sides of the thin-walled member 3, all the pins 12 are identical, and the height of the tops of all the pins 12 is the same. All the springs 13 are identical, for example, made of the same material, the same shape, the same size, etc., and correspond one to one with the pins 12.

[0040] In another specific implementation, the distance between the bottom of the upper shaping plate 14 and the highest point of the top of the thin-walled part 3 is 0-0.2 mm, so that the upper shaping plate 14 just contacts the thin-walled part 3 or is separated by a very small distance.

[0041] Preferably, the lower shaping plate 11, the upper shaping plate 14 and the counterweight block 15 are made of titanium alloy. Of course, in a specific implementation, they can also be made of other specific materials, which are not limited here.

[0042] Further preferably, in order to further improve the shaping effect of the thin-walled part 3, the flatness of the lower surface of the upper shaping plate 14 is ±0.02 mm; the flatness of the upper surface of the lower shaping plate 11 is ±0.02 mm.

[0043] Preferably, the minimum spacing distance between the pin 12 and the thin-walled part 3 is 2 mm to 5 mm.

[0044] After the support of the thin-walled part 3 is removed after 3D printing, according to the acceptance requirements, it is necessary to detect whether the surface of the thin-walled part 3 is deformed, including overall deformation or local deformation. The position where the deformation does not meet the requirements is reshaped by the shaping device for 3D printing of the thin-walled part 3 of this embodiment to meet the acceptance requirements. The working process of the shaping device for 3D printing of the thin-walled part 3 of this embodiment is described in detail below:

[0045] The thin-walled part 3 is placed on the lower shaping plate 11. The spring 13 built into the lower shaping plate 11 makes the pin 12 float. The pin 12 is arranged at uniform or unequal distances along the edge of the thin-walled part 3. Then, a shaping plate 14 is added to the thin-walled part 3. According to the structure of the thin-walled part 3 and the control requirements of the deformation amount, one or more counterweights 15 can be added to the upper shaping plate 14. The upper shaping plate 14 descends under the action of gravity. By adjusting the size or weight of the counterweight 15, the upper shaping plate 14 is made to just touch the thin-walled part 3, or a certain distance (about 0.2 mm) is retained. The adjusted bearing mechanism 1 is placed in a heating furnace 2 for low-temperature annealing. When the temperature is heated to 300°C, the spring 13 fails, and the gravity of the upper shaping plate 14 and the counterweight block 15 directly acts on the thin-walled part 3 to shape the thin-walled part 3 without crushing it. By keeping warm for a certain period of time, the internal stress of the thin-walled part 3 is reduced. After heat treatment, the thin-walled part 3 does not rebound or rebounds less, so as to achieve the shaping effect.

[0046] The above embodiments are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. It should be pointed out that some modifications and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A shaping device for thin-walled parts for 3D printing, characterized in that: It includes a carrying mechanism and a heating furnace, and the carrying mechanism includes: A lower shaping plate, which is used to place 3D printed thin-walled parts; A plurality of pins are arranged on the lower shaping plate and located on both sides of the thin-walled part to prevent the thin-walled part from moving in the horizontal direction; A plurality of springs, each spring being arranged at the bottom of a pin and embedded in the lower shaping plate; an upper shaping plate, which is located above the thin-walled member and supported by a plurality of pins; and At least one counterweight is placed on the upper shaping plate; wherein, The bearing mechanism is placed in the heating furnace, and all springs are put into a failure state by heating the bearing mechanism, so that the upper shaping plate and the counterweight block are pressed onto the thin-walled part under the action of gravity to shape the thin-walled part.

2. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The shaping device further comprises at least one guide column, which is fixedly mounted on the lower shaping plate. The upper shaping plate and the counterweight block are both provided with through holes for the guide column to be inserted.

3. The shaping device for thin-walled parts for 3D printing according to claim 2, characterized in that: There are two guide posts, which are symmetrically arranged on the lower shaping plate.

4. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The plurality of pins are evenly and spaced apart on both sides of the thin-walled member, all the pins are identical, and the heights of the tops of all the pins are the same.

5. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: All springs are identical.

6. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The distance between the bottom of the upper shaping plate and the highest point of the top of the thin-walled part is 0-0.2 mm.

7. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The lower shaping plate, the upper shaping plate and the counterweight are made of titanium alloy.

8. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The flatness of the lower surface of the upper shaping plate is ±0.02 mm.

9. The shaping device for thin-walled parts for 3D printing according to claim 1, characterized in that: The flatness of the upper surface of the lower shaping plate is ±0.02 mm.

10. The shaping device for thin-walled parts for 3D printing according to any one of claims 1 to 9, characterized in that: The minimum spacing distance between the pin and the thin-walled part is 2 mm to 5 mm.

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