CN113798509A - Method for providing easily separable sintering support for 3DP formed metal workpiece - Google Patents
Method for providing easily separable sintering support for 3DP formed metal workpiece Download PDFInfo
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- CN113798509A CN113798509A CN202111058921.XA CN202111058921A CN113798509A CN 113798509 A CN113798509 A CN 113798509A CN 202111058921 A CN202111058921 A CN 202111058921A CN 113798509 A CN113798509 A CN 113798509A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/10—Formation of a green body
- B22F10/14—Formation of a green body by jetting of binder onto a bed of metal powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/40—Structures for supporting workpieces or articles during manufacture and removed afterwards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method for providing a shape-following easily-separated sintering support for a 3DP formed metal workpiece, which comprises the following steps: manufacturing a three-dimensional model diagram of a supporting piece of a part, which needs to be supported, of the metal workpiece in the later sintering process on the three-dimensional model diagram of the metal workpiece, wherein the contact part of the supporting piece and the metal workpiece is matched, and a vertical interval is arranged between the contact parts of the three-dimensional model diagram of the metal workpiece and the supporting piece; printing together to obtain a metal workpiece and a support; pre-sintering the metal workpiece and the support piece together to obtain the metal workpiece and the support piece with initial mechanical strength; adding high-temperature-resistant powder into a contact part of the metal workpiece and the support; and placing the metal workpiece and the support piece into a sintering furnace according to the position and the direction in the three-dimensional model diagram for sintering. The metal workpiece and the supporting piece are printed at the same time and are pre-sintered at the same time, the metal workpiece and the supporting piece have the same shrinkage characteristic, the metal workpiece can be prevented from cracking in the sintering process, and the supporting piece and the metal workpiece can be easily separated after sintering.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a method for providing easy-to-separate sintering support for a 3DP formed metal workpiece.
Background
The manufacturing of complex Three-Dimensional workpieces is realized by a layered stacking method in an English name Binder Jetting (BJ, also called Three-Dimensional Jetting printing, 3 DP).
One important application of binder jetting (3DP) is in printing metal powder, pre-sintering the printed metal workpiece to obtain a preliminary mechanical strength, and then sintering the metal workpiece in a sintering furnace after a powder cleaning process. The sintering process needs to be carried out at a temperature close to but less than the melting point of the metal, the metal workpiece at high temperature is softened, the overhanging part of the metal workpiece is bent and sagged by the self weight of the metal workpiece, and at this time, in order to ensure that the metal workpiece is not deformed, the part which is possibly bent and sagged needs to be provided with support.
The common method is to use a high-temperature resistant ceramic block to pad a part which is possibly bent and sagged, but as the sintering progresses, the metal workpiece is obviously shrunk, and the ceramic block is slightly shrunk, so that the metal workpiece and the ceramic block are relatively displaced to generate cracks. The ceramic cushion block with small shrinkage rate cannot play a role in preventing deformation due to the fact that the ceramic cushion block always pushes against a part, which can be bent, of a formed part in the process that the formed part shrinks to be short, the formed part deforms, and the supporting function of the ceramic cushion block is lost.
Disclosure of Invention
Based on the above, in order to meet the requirement of 3DP sintering support, the present invention aims to provide a method for providing easily separable sintering support for 3DP formed metal workpieces, the method enables a support member and the metal workpiece to have the same shrinkage characteristic, deformation of the metal workpiece during sintering can be effectively prevented, and the support member and the metal workpiece manufactured by the method can be easily separated after sintering is completed, so that the 3DP metal workpiece is simple and convenient to manufacture, good in reliability, stable in structure during manufacturing, and excellent in quality.
A method of providing a shape-following readily separable sintered support for a 3DP formed metal workpiece, comprising the steps of: manufacturing a three-dimensional model diagram of a supporting piece of a part, which needs to be supported, of the metal workpiece in the post sintering process on the three-dimensional model diagram of the metal workpiece, wherein the contact part of the supporting piece and the metal workpiece is matched, and the contact part between the three-dimensional patterns of the metal workpiece and the supporting piece is provided with a vertical interval; printing together to obtain the separated metal workpiece and the support; pre-sintering the metal workpiece and the support piece together to obtain the metal workpiece and the support piece with initial mechanical strength; adding high-temperature-resistant powder into a contact part of the metal workpiece and the support; and placing the metal workpiece and the support piece into a sintering furnace to be sintered completely according to the position and the direction in the three-dimensional model drawing.
According to the method for providing the shape-following easily-separated sintering support for the 3DP formed metal workpiece, the three-dimensional model diagram of the support is generated on the three-dimensional model diagram of the metal workpiece at the same time, the three-dimensional model diagram with the metal workpiece and the support is delivered to a printer to be printed at the same time, the contact part of the support and the metal workpiece which are completely overlapped can be finally obtained, and the matching precision of the contact part between the metal workpiece and the support is high. The method comprises the steps of printing and pre-sintering a metal workpiece and a support at the same time, adding high-temperature-resistant powder to contact parts of the metal workpiece and the support which are respectively obtained through pre-sintering, and finally sintering the metal workpiece and the support together. In the method, the metal workpiece and the support are printed together, so that the metal workpiece and the support with the same manufacturing process and manufacturing parameters can be obtained, and the metal workpiece and the support have the same shrinkage characteristic. Meanwhile, the printed metal workpiece and the support are subjected to pre-sintering treatment firstly, so that the support and the metal workpiece entity with certain strength are obtained, and the support and the metal workpiece are convenient to place and assemble in a sintering furnace subsequently. High-temperature resistant powder is added to the surface of the contact part of the metal workpiece with primary strength and the support member obtained after the completion of the pre-sintering, and then sintering is completed in a sintering furnace. Because the high-temperature-resistant powder is paved between the contact parts of the metal workpiece and the support piece, the metal workpiece and the support piece are not bonded after sintering, the support piece on the metal workpiece can be easily removed, and the surface of the metal workpiece is not degraded. In the method for providing the sintering support for the 3DP formed metal workpiece, when the three-dimensional pattern of the support member of the portion of the metal workpiece to be supported is formed on the three-dimensional model diagram of the metal workpiece, a vertical space is provided between the three-dimensional pattern of the support member and the metal workpiece at the contact portion. By setting the spacing distance, it can be ensured that the metal workpiece and the support member are separated after printing is completed.
According to the method for providing the easily-separated sintering support for the 3DP formed metal workpiece, the metal workpiece and the support are printed, pre-sintered and sintered simultaneously, the support can provide a good supporting effect in the sintering process of the metal workpiece, the method for generating the support on the metal workpiece is simple and reliable, the support can be removed easily after sintering, the surface of the metal workpiece cannot be damaged, and therefore the manufacturing quality of the 3DP metal workpiece can be improved.
In one embodiment, the method for manufacturing the three-dimensional graph of the support of the part of the metal workpiece needing to be supported in the post-sintering process on the three-dimensional model graph of the metal workpiece comprises the following specific steps:
and manufacturing a three-dimensional graph of the supporting piece with a full solid structure or a hollow structure on the three-dimensional model graph of the metal workpiece according to the weight and the size of the part of the metal workpiece which can be bent and sagged.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the support member may be selected to have a full solid structure or a hollow structure according to the weight and size of the portion of the metal workpiece that may be bent and sagged. When the full solid structure is used, the supporting strength of the supporting piece to the metal workpiece is good, and the risk that the metal workpiece collapses and is damaged due to the fact that the weight of the bent and drooped part of the metal workpiece cannot be supported in the sintering process of the metal workpiece can be reduced. When the hollow structure is used, the metal workpiece can be well supported under the condition that the metal workpiece is likely to bend and droop, and the weight or the bending degree is not large, so that the material consumption can be reduced, and the material waste is avoided.
In one embodiment, the method for manufacturing the three-dimensional graph of the support of the part of the metal workpiece needing to be supported in the post-sintering process on the three-dimensional model graph of the metal workpiece comprises the following specific steps:
according to the weight and the size of the part of the metal workpiece which can be bent and sagged, a support part which is in full contact with the part of the metal workpiece which can be bent and sagged is manufactured on the three-dimensional model drawing of the metal workpiece; or
And manufacturing a support which is in segmented contact with the possibly bent and drooped part of the metal workpiece on the three-dimensional model drawing of the metal workpiece according to the weight and the size of the possibly bent and drooped part of the metal workpiece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, when the three-dimensional pattern of the support of the portion of the metal workpiece to be supported is formed on the three-dimensional model diagram of the metal workpiece, the support which is in full contact with the portion of the metal workpiece which is likely to bend and sag can be formed on the three-dimensional model diagram of the metal workpiece according to the weight and size of the portion of the metal workpiece which is likely to bend and sag, or the support which is in segmented contact with the portion of the metal workpiece which is likely to bend and sag can be formed on the three-dimensional model diagram of the metal workpiece.
The method for providing the easily separable sintering support for the 3DP formed metal workpiece can comprehensively judge whether the support in full contact with the possibly bent and drooped part or the support in partial sectional contact is used by combining the actual conditions of the weight, the size and the like of the possibly bent and drooped part of the metal workpiece. When the support members which are all in contact are used, the support strength of the support members to the metal workpiece is good, and the structural stability of the metal workpiece is good. The contact surface of the support piece in sectional contact is small, the separation difficulty of the support piece and the metal workpiece after sintering is low, the usage amount of materials is small, and the cost is low.
In one embodiment, the step of adding the high-temperature-resistant powder to the contact part of the metal workpiece and the support comprises the following steps:
the laid refractory powder completely covers the contact portion of the support and the metal workpiece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the high temperature resistant powder is added to the contact portion between the metal workpiece and the support, and the high temperature resistant powder is added in an amount required to completely cover the contact portion between the support and the metal workpiece, so as to prevent the metal workpiece and the support from being adhered during the sintering process, which results in difficulty in separating the metal workpiece from the support at a part of the position.
In one embodiment, the printing together to obtain the separated metal workpiece and the support comprises the following steps:
the printing software simultaneously processes the three-dimensional graphic data of the metal workpiece and the support piece to generate common printing data;
the support is printed with the metal workpiece.
The method for providing the easily separable sintering support for the 3DP formed metal workpiece comprises the following specific steps of: the printing software simultaneously processes the three-dimensional graphic data of the metal workpiece and the support piece to generate common printing data; the support is printed with the metal workpiece. According to the method, the metal workpiece and the support piece are printed together, so that the support piece and the metal workpiece have the same shrinkage characteristic, the support piece and the metal workpiece are subjected to post-treatment together after printing is finished, the shrinkage characteristics of the support piece and the metal workpiece are kept synchronous, and the situation that the metal workpiece is cracked due to the fact that the shrinkage rate of the metal workpiece and the shrinkage rate of the support piece are asynchronous in the shrinkage process can be prevented.
In one embodiment, the metal workpiece and the support are pre-sintered together, including the following steps:
putting the metal workpiece printed in the forming cylinder, the supporting piece, the unbonded material powder and the forming cylinder into a vacuum pre-sintering furnace, heating to 150-200 ℃ at a heating rate of 3-10 ℃/min, and keeping the temperature for 2-8 hours according to the size of the metal workpiece;
and after the heat preservation is finished, obtaining a pre-sintered metal workpiece and a supporting piece, and cleaning redundant powder on the metal workpiece and the supporting piece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the support, the unsintered powder and the forming cylinder are presintered to solidify the binder and form bonding necks between the powders. When the temperature rises to 150-200 ℃ according to the heating rate of 3-10 ℃/min, and the metal workpiece is subjected to vacuum pre-sintering after heat preservation for 2-8 hours according to different sizes of the metal workpiece, the binder is solidified, and bonding necks among the powder enable the powder to be gathered together with certain strength, so that the shape of the metal workpiece is maintained. And after the heat preservation is finished, after the pre-sintered metal workpiece and the support piece are obtained, cleaning redundant powder on the metal workpiece and the support piece, and preventing the redundant powder from being integrated with the surface of the workpiece in the sintering process to deteriorate the surface of the workpiece.
In one embodiment, the vertical spacing distance of the contact part between the metal workpiece and the three-dimensional pattern of the support is 0.1-1.0 mm.
In one embodiment, the refractory powder is alumina or any one of refractory ceramic powders.
Compared with the prior art, the invention has the beneficial effects that: the metal workpiece and the supporting piece are printed and pre-sintered simultaneously by adopting the same base material and parameters, so that the supporting piece and the metal workpiece have the same shrinkage characteristic, and the phenomenon that the metal workpiece is cracked due to obvious displacement generated in the sintering process because the shrinkage characteristic difference between the metal workpiece and the supporting piece is large can be effectively avoided; the surfaces of the contact parts of the supporting piece and the metal workpiece are completely overlapped, and after the contact surfaces of the supporting piece and the metal workpiece are coated with high-temperature-resistant powder and sintered, the supporting piece and the metal workpiece can be easily separated, so that the surface quality of the metal workpiece cannot be degraded; and (III) the metal workpiece and the supporting piece are printed simultaneously, so that the manufacturing process is convenient to operate, and the printing efficiency is improved.
Drawings
FIG. 1 is a flow chart illustrating a method for providing conformal, readily releasable sintered support for a 3DP formed metal workpiece, in accordance with one embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A method of providing formfollowing, readily separable sintered support for a 3DP formed metal workpiece according to some embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1, a method of providing form-ready releasable sintered support for a 3DP formed metal workpiece, comprising the steps of:
s11, manufacturing a three-dimensional model diagram of a support part of the metal workpiece needing to be supported in the later sintering process on the three-dimensional model diagram of the metal workpiece, wherein the contact part of the support part and the metal workpiece is matched, and the contact part between the three-dimensional patterns of the metal workpiece and the support part is provided with a vertical interval;
s12, printing together to obtain a separated metal workpiece and a support;
s13, pre-sintering the metal workpiece and the support piece together to obtain the metal workpiece and the support piece with preliminary mechanical strength;
s14, adding high-temperature-resistant powder into the contact part of the metal workpiece and the support;
and S15, placing the metal workpiece and the support into a sintering furnace to be sintered according to the position and the direction in the three-dimensional model diagram.
According to the method for providing the shape-following easily-separated sintering support for the 3DP formed metal workpiece, the three-dimensional model diagram of the support is generated on the three-dimensional model diagram of the metal workpiece at the same time, the three-dimensional model diagram with the metal workpiece and the support is delivered to a printer to be printed at the same time, the contact part of the support and the metal workpiece which are completely overlapped can be finally obtained, and the matching precision of the contact part between the metal workpiece and the support is high. The method comprises the steps of printing and pre-sintering a metal workpiece and a support at the same time, adding high-temperature-resistant powder to contact parts of the metal workpiece and the support which are respectively obtained through pre-sintering, and finally sintering the metal workpiece and the support together. In the method, the metal workpiece and the support are printed together, so that the metal workpiece and the support with the same manufacturing process and manufacturing parameters can be obtained, and the metal workpiece and the support have the same shrinkage characteristic. Meanwhile, the printed metal workpiece and the support are subjected to pre-sintering treatment firstly, so that the support and the metal workpiece entity with certain strength are obtained, and the support and the metal workpiece are convenient to place and assemble in a sintering furnace subsequently. High-temperature resistant powder is added to the surface of the contact part of the metal workpiece with primary strength and the support member obtained after the completion of the pre-sintering, and then sintering is completed in a sintering furnace. Because the high-temperature-resistant powder is paved between the contact parts of the metal workpiece and the support piece, the metal workpiece and the support piece are not bonded after sintering, the support piece on the metal workpiece can be easily removed, and the surface of the metal workpiece is not degraded. In the method for providing the sintering support for the 3DP formed metal workpiece, when the three-dimensional pattern of the support member of the portion of the metal workpiece to be supported is formed on the three-dimensional model diagram of the metal workpiece, a vertical space is provided between the three-dimensional pattern of the metal workpiece and the three-dimensional pattern of the support member at the contact portion. By setting the spacing distance, it can be ensured that the metal workpiece and the support member are separated after printing is completed.
According to the method for providing the easily-separated sintering support for the 3DP formed metal workpiece, the metal workpiece and the support are printed, pre-sintered and sintered simultaneously, the support can provide a good supporting effect in the sintering process of the metal workpiece, the method for generating the support on the metal workpiece is simple and reliable, the support can be removed easily after sintering, the surface of the metal workpiece cannot be damaged, and therefore the manufacturing quality of the 3DP metal workpiece can be improved.
Optionally, in this embodiment, in making a three-dimensional graph of a support of a portion of the metal workpiece that needs to be supported in a post-sintering process on the three-dimensional model diagram of the metal workpiece, the method further includes the following steps:
and manufacturing a three-dimensional graph of the support member with a full solid structure or a hollow structure on the three-dimensional model graph of the metal workpiece according to the weight and the size of the part of the metal workpiece which can be bent and sagged.
The printing software can generate supports of various styles, including supports of a full solid structure, supports of a hollow structure, supports of a columnar structure and supports of a sheet-shaped or net-shaped structure. The support can be in various forms, and the required support form is selected in the printing software before the support is generated.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the support member may be selected to have a full solid structure or a hollow structure according to the weight and size of the portion of the metal workpiece that may be bent and sagged. When the full solid structure is used, the supporting strength of the supporting piece to the metal workpiece is good, and the risk that the metal workpiece collapses and is damaged due to the fact that the weight of the bent and drooped part of the metal workpiece cannot be supported in the sintering process of the metal workpiece can be reduced. When the hollow structure is used, the metal workpiece can be well supported under the condition that the metal workpiece is likely to bend and droop, and the weight or the bending degree is not large, so that the material consumption can be reduced, and the material waste is avoided.
Optionally, in this embodiment, in making a three-dimensional graph of a support of a portion of the metal workpiece that needs to be supported in a post-sintering process on the three-dimensional model diagram of the metal workpiece, the method further includes the following steps:
according to the weight and the size of the part of the metal workpiece which can be bent and sagged, a support part which is in full contact with the part of the metal workpiece which can be bent and sagged is manufactured on the three-dimensional model drawing of the metal workpiece; or
And manufacturing a support which is in segmented contact with the possibly bent and drooped part of the metal workpiece on the three-dimensional model drawing of the metal workpiece according to the weight and the size of the possibly bent and drooped part of the metal workpiece.
The printing software can generate full-contact support or segmented-contact support according to the possible bending and sagging parts of the metal workpiece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, when the three-dimensional pattern of the support of the portion of the metal workpiece to be supported is formed on the three-dimensional model diagram of the metal workpiece, the support which is in full contact with the portion of the metal workpiece which is likely to bend and sag can be formed on the three-dimensional model diagram of the metal workpiece according to the weight and size of the portion of the metal workpiece which is likely to bend and sag, or the support which is in segmented contact with the portion of the metal workpiece which is likely to bend and sag can be formed on the three-dimensional model diagram of the metal workpiece.
The method for providing the easily separable sintering support for the 3DP formed metal workpiece can comprehensively judge whether the support in full contact with the possibly bent and drooped part or the support in partial sectional contact is used by combining the actual conditions of the weight, the size and the like of the possibly bent and drooped part of the metal workpiece. When the support members which are all in contact are used, the support strength of the support members to the metal workpiece is good, and the structural stability of the metal workpiece is good. The contact surface of the support piece in sectional contact is small, the separation difficulty of the support piece and the metal workpiece after sintering is low, the usage amount of materials is small, and the cost is low.
Optionally, in this embodiment, the high temperature resistant powder is added to the contact portion between the metal workpiece and the support, and the specific steps are as follows: the laid refractory powder completely covers the contact portion of the support and the metal workpiece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the high temperature resistant powder is added to the contact portion between the metal workpiece and the support, and the high temperature resistant powder is added in an amount required to completely cover the contact portion between the support and the metal workpiece, so as to prevent the metal workpiece and the support from being adhered during the sintering process, which results in difficulty in separating the metal workpiece from the support at a part of the position.
Optionally, in this embodiment, the metal workpiece and the support are printed together to obtain a separated metal workpiece and support, and the specific steps are as follows:
the printing software simultaneously processes the three-dimensional graphic data of the metal workpiece and the support piece to generate common printing data;
the support is printed with the metal workpiece.
The method for providing the easily separable sintering support for the 3DP formed metal workpiece comprises the following specific steps of: the printing software simultaneously processes the three-dimensional graphic data of the metal workpiece and the support piece to generate common printing data; the support is printed with the metal workpiece. According to the method, the metal workpiece and the support piece are printed together, so that the support piece and the metal workpiece have the same shrinkage characteristic, the support piece and the metal workpiece are subjected to post-treatment together after printing is finished, the shrinkage characteristics of the support piece and the metal workpiece are kept synchronous, and the situation that the metal workpiece is cracked due to the fact that the shrinkage rate of the metal workpiece and the shrinkage rate of the support piece are asynchronous in the shrinkage process can be prevented.
Optionally, in this embodiment, the metal workpiece and the support are pre-sintered together, and the specific steps are as follows:
putting the metal workpiece printed in the forming cylinder, the supporting piece, the unbonded material powder and the forming cylinder into a vacuum pre-sintering furnace, heating to 150-200 ℃ at a heating rate of 3-10 ℃/min, and keeping the temperature for 2-8 hours according to the size of the metal workpiece;
and after the heat preservation is finished, obtaining a pre-sintered metal workpiece and a supporting piece, and cleaning redundant powder on the metal workpiece and the supporting piece.
In the method for providing the easily separable sintering support for the 3DP formed metal workpiece, the support, the unsintered powder and the forming cylinder are presintered to solidify the binder and form bonding necks between the powders. When the temperature rises to 150-200 ℃ according to the heating rate of 3-10 ℃/min, and the metal workpiece is subjected to vacuum pre-sintering after heat preservation for 2-8 hours according to different sizes of the metal workpiece, the binder is solidified, and bonding necks among the powder enable the powder to be gathered together with certain strength, so that the shape of the metal workpiece is maintained. And after the heat preservation is finished, after the pre-sintered metal workpiece and the support piece are obtained, cleaning redundant powder on the metal workpiece and the support piece, and preventing the redundant powder from being integrated with the surface of the workpiece in the sintering process to deteriorate the surface of the workpiece.
Optionally, in this embodiment, the vertical distance between the contact portions of the metal workpiece and the three-dimensional pattern of the support is 0.1 to 1.0 mm.
Optionally, in this embodiment, the refractory powder is alumina or any one of refractory ceramic powders.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method of providing a shape-following readily separable sintered support for a 3DP formed metal workpiece, comprising the steps of:
manufacturing a three-dimensional model diagram of a supporting piece of a part, which needs to be supported, of the metal workpiece in the post sintering process on the three-dimensional model diagram of the metal workpiece, wherein the contact part of the supporting piece and the metal workpiece is matched, and the contact part between the three-dimensional patterns of the metal workpiece and the supporting piece is provided with a vertical interval;
printing together to obtain the separated metal workpiece and the support;
pre-sintering the metal workpiece and the support piece together to obtain the metal workpiece and the support piece with initial mechanical strength;
adding high-temperature-resistant powder into a contact part of the metal workpiece and the support;
and placing the metal workpiece and the support piece into a sintering furnace to be sintered completely according to the position and the direction in the three-dimensional model drawing.
2. The method of claim 1, wherein the step of forming a three-dimensional pattern of a support on the metal workpiece for a portion of the metal workpiece to be supported during a post-sintering process on a three-dimensional model of the metal workpiece comprises the steps of:
and manufacturing a three-dimensional graph of the supporting piece with a full solid structure or a hollow structure on the three-dimensional model graph of the metal workpiece according to the weight and the size of the part of the metal workpiece which can be bent and sagged.
3. The method of claim 1, wherein the step of forming a three-dimensional pattern of a support on the metal workpiece for a portion of the metal workpiece to be supported during a post-sintering process on a three-dimensional model of the metal workpiece comprises the steps of:
according to the weight and the size of the part of the metal workpiece which can be bent and sagged, a support part which is in full contact with the part of the metal workpiece which can be bent and sagged is manufactured on the three-dimensional model drawing of the metal workpiece; or
And manufacturing a support which is in segmented contact with the possibly bent and drooped part of the metal workpiece on the three-dimensional model drawing of the metal workpiece according to the weight and the size of the possibly bent and drooped part of the metal workpiece.
4. The method of claim 1, wherein the step of adding the refractory powder to the contact portion of the metal workpiece and the support comprises:
the laid refractory powder completely covers the contact portion of the support and the metal workpiece.
5. A method of providing form-ready separable sintered support for a 3DP formed metal workpiece according to claim 1, wherein said co-printing provides separate metal workpiece and support by:
the printing software simultaneously processes the three-dimensional graphic data of the metal workpiece and the support piece to generate common printing data;
the support is printed with the metal workpiece.
6. A method of providing a form sensitive detachable sintered support for a 3DP formed metal workpiece according to claim 1, wherein said metal workpiece is pre-sintered together with the support by:
putting the metal workpiece printed in the forming cylinder, the supporting piece, the unbonded material powder and the forming cylinder into a vacuum pre-sintering furnace, heating to 150-200 ℃ at a heating rate of 3-10 ℃/min, and keeping the temperature for 2-8 hours according to the size of the metal workpiece;
and after the heat preservation is finished, obtaining a pre-sintered metal workpiece and a supporting piece, and cleaning redundant powder on the metal workpiece and the supporting piece.
7. The method of claim 1, wherein the vertical separation distance between the contact location of the metal workpiece and the three-dimensional pattern of the support member is 0.1 to 1.0 mm.
8. The method of claim 1, wherein the refractory powder is alumina or any one of a refractory ceramic powder.
Priority Applications (1)
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