CN101670437B - Mould making method with conformal cooling pipe - Google Patents
Mould making method with conformal cooling pipe Download PDFInfo
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- CN101670437B CN101670437B CN2009101089191A CN200910108919A CN101670437B CN 101670437 B CN101670437 B CN 101670437B CN 2009101089191 A CN2009101089191 A CN 2009101089191A CN 200910108919 A CN200910108919 A CN 200910108919A CN 101670437 B CN101670437 B CN 101670437B
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Abstract
The invention relates to a mould making method with a conformal cooling pipe, aiming at solving the technical problems of three-dimensional curve setting of the existing mould cooling runner and the application of processing by laser melting and forming process. The technical scheme is as follows: a mould external contour shell with a design wall thickness and the conformal cooling pipe are manufactured by a laser melting and forming method, wherein the conformal cooling pipe is arranged in the mould external contour shell which is preheated; the gap formed between the mould cooling pipe and the mould external contour shell is casted and filled; and the mould external contour shell and the casted and filled part are subjected to whole surface finishing treatment. The method has the advantages that the mould manufacturing method has simple process, the mould manufacturing accuracy is high, the mould cooling pipe can be arranged at will according to design requirements, thus meeting the cooling requirement of the mould in the cooling process, improving the service life of the mould reducing the mould manufacturing cost and manufacturing period, and simultaneously being capable of changing the material of the mould external contour shell to meet the mould manufacturing with different requirements.
Description
Affiliated technical field
The present invention relates to a kind of mould manufacturing method, particularly a kind of laser that adopts dissolves technology and casting of metals technology in conjunction with making a kind of mould manufacturing method that has conformal cooling pipe.
Background technology
Technology of die manufacturing is one of most widely used technology in the current manufacturing industry, being provided with on mould that cooling pipe cools off mould by ducted recirculated water is the most simple and efficient method of mold cools down, and the cooling system of mould has material impact to life-span, production efficiency of products and the quality of mould.Particularly more apparent it is important for the cooling system of the large mold of die cavity complexity.The conventional method of mould manufacturing is: to metal blank carry out car, mill, processing such as plane, brill, mill, galvanic corrosion, thereby obtain required mold shape and size.Said method still difficulty processes the endoporus that track is a three-dimensional curve in metal blank, therefore, the coolant flow channel of the mould of conventional method manufacturing generally all is made up of one group of straight perforate system, for forming the stream of sealing, except that import and outlet, other perforate need seal with plug.There is following problem in this cooling technology: at first, the setting of coolant flow channel is subject to processing process limitation, and can't realize needs to be provided with by design, and cooling effectiveness is low, and cooling effect is poor.Because the die cavity of mould is generally all very complicated, the cooling system that straight hole system forms can't guarantee that the die cavity each several part evenly cools off, and product easily causes distortion because of inhomogeneous cooling is even.Secondly, the processing technology complexity, the hole ties up to when mould is made and need process, and needs to block up with plug when molding.Because the shortage of the limitation of means and suitable cooling water channel design theory in the die manufacture, the design of cooling water channel at present still is confined under the relative simple version with making, therefore in mould is made, how to solve and by designing requirement coolant flow channel is set arbitrarily in mould and reaches that to improve the instructions for use that cooling effectiveness satisfies mould be the technical problem that the industry needs to be resolved hurrily.
The selective laser manufacturing process be divided into dissolve shaping (Selective Laser Melting, SLM) and thermal sintering (Selective Laser Sintering, SLS), its operation principle is; Generate the cad model of entity on computers, generate stl file through slicing treatment again, utilize computer control laser successively will be shaped, select for use pressed powder, finally formed required prototype or part as dissolving shaping or thermal sintering material after being layering.It is wide that this technology has moulding material, and manufacture process is not subjected to the influence of part complexity, makes the efficient height, and the characteristics that cost is low are particularly suitable for being used for mfg. moulding die to use.
Abroad (Selective Laser Sintering, SLS) mfg. moulding die has launched broad research, mainly uses two kinds of methods to utilizing the selective laser sintering (SLS) method at present.First method is with high power laser direct forming mould, studying the most successful is the EOS company of Germany, its material trade mark is respectively DirectMetal 100, DirectMetal50, DirectMetal20, DirectSteel150-VI, DirectSteel120-VI etc., the hot strength of the mould of manufacturing can reach 491MPa.Another kind then utilizes the indirect shaping dies of low-power laser, studying the most successful is the DTM company of the U.S., its material trade mark is respectively RapidSteel 1.0, RapidSteel 2.0, LaserForm ST-100, LaserForm ST-200, LaserFormA6 (material trade mark) etc., these materials mainly all are to be used for making injection mould, and the injection mold intensity of its manufacturing can reach more than the 587MPa, and the life-span of injection mould has reached 100,000/pair.Above-mentioned two class methods all are to adopt special powder, and rely on above-mentioned monotechnics and carry out the monolithic molding of die insert, and forming technology process complexity needs the shaping post processing, the cost height.
Selective laser dissolves manufacturing process (Selective Laser Melting, SLM) the shaping powder of Shi Yonging can use single metal or metal alloy powder, can be according to the instructions for use of different moulds, select the machinery shaping powder different to satisfy the use needs of mould with physical property, because the workpiece that dissolves after manufacturing process is shaped has bigger internal stress, and remove difficulties, easily crack and be out of shape for the bigger workpiece of volume, directly make the existing technology of large mold and also can't solve this technological deficiency so selective laser dissolves manufacturing process.
Summary of the invention
For solving the technical problem that endoporus is processed and selective laser dissolves the bigger mould of manufacturing process incompatibility shaping volume that can't realize the coolant flow channel three-dimensional curve in the existing mold manufacturing, the present invention is dissolved forming technique technology and a kind of mould manufacturing method that has cooling pipe of casting technique technology invention in conjunction with existing selective laser, solved in the mould coolant flow channel by designing requirement, the technical problem that the axis of realization coolant flow channel dissolves the bigger mould of manufacturing process incompatibility moulding volume with mold cavity setting and selective laser in the space three-dimensional direction of curve in mould, reach the manufacturing cost that reduces mould, improve mold cools down efficient, mould and die accuracy and the goal of the invention of minimizing manufacturing cycle.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of mould manufacturing method that has conformal cooling pipe, this mould manufacturing method adopt following steps to realize:
(1), adopt selective laser to melt the mould outline housing that manufacturing process is made single metal alloy powders or metallic element composite powder material and had design wall thickness, mould outline housing upper surface is a mold cavity, is the casting cavity filling in the mould outline housing;
(2), the shape of the mould outline housing upper surface mold cavity made according to step (1), correspondence manufactures and designs axis and can be the mould conformal cooling pipe that the space three-dimensional curve is provided with arbitrarily;
(3), the mold cools down pipeline that step (2) is made is installed in the mould outline housing of step (1) manufacturing, mould outline housing carries out preheating, uses method that single metal or metal alloy adopts casting with the filling of casting of the mold cools down pipeline and the gap of mould outline housing formation;
(4), have the mould outline housing and the casting filling part of conformal cooling pipe after step (3) casting filled, carry out whole Surface Finishing and handle.
The invention has the beneficial effects as follows that it is simple that mould manufacturing method has technology, mould accuracy of manufacture height, the mold cools down pipeline can be provided with arbitrarily according to designing requirement, satisfies mould cooling requirement in use, improves the service life of mould.Reduce die manufacturing cost and manufacturing cycle, and can be by changing the mould manufacturing that mould outline case material satisfies different needs.
The specific embodiment
This mould manufacturing method adopts following steps to realize:
(1), adopt selective laser to melt the mould outline housing that manufacturing process is made single metal alloy powders or metallic element composite powder material and had design wall thickness, mould outline housing upper surface is a mold cavity, is the casting cavity filling in the mould outline housing.
In the above-mentioned technology, according to the concrete machinery of mould and the technical parameter of physical property requirement, choose single metal alloy powders or metallic element composite powder manufactured materials as the mold profile housing, the metal powder material of mfg. moulding die profile housing is fully mixed in high energy ball mill, it is evenly distributed separately, characteristics according to the shaping dusty material, adopt the Computerized three-dimensional Structure Design Software to design mould outline housing threedimensional model with certain wall thickness, adopt SLM equipment that the powder that mixes is formed, produce mould outline housing.
(2), the shape of the mould outline housing upper surface mold cavity made according to step (1), correspondence manufactures and designs axis and can be the mould conformal cooling pipe that the space three-dimensional curve is provided with arbitrarily.
In the above-mentioned technology, adopt the tubing machinery bending former tool required cooling water channel approaching with the mold materials fusing point, the route of water channel has the characteristics of amiable mold cavity shape.Satisfy the design needs of cooling water channel to the mold cavity cooling.
(3), the mold cools down pipeline that step (2) is made is installed in the mould outline housing of step (1) manufacturing, mould outline housing carries out preheating, uses method that single metal or metal alloy adopts casting with the filling of casting of the mold cools down pipeline and the gap of mould outline housing formation.
Casting fills that to have technology simple, with low cost and characteristics that process cycle is short, and can by change the casting packing material satisfy casting packing material and mould outline housing metallurgical junction with joint efforts, technical problems such as the heat conductivility of mould and mechanical strength.
(4), have the mould outline housing and the casting filling part of conformal cooling pipe after step (3) casting filled, carry out whole Surface Finishing and handle.Adopt the method for electrobrightening or machine glazed finish to make its surface smoothness reach the requirement of injection part.
In the mould manufacturing method of the present invention, the material and the technological parameter of mould outline housing processing and implementation example 1 are;
(1), adopting the material of selective laser fusing manufacturing process (SLM) mfg. moulding die outline housing is the mould steel powder of particle mean size 40 μ m, mould outline thickness of shell is 3mm, and the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
In the mould manufacturing method of the present invention, the material and the technological parameter of mould outline housing processing and implementation example 2 are;
(1), adopt the material selection tool steel powder of selective laser fusing manufacturing process (SLM) mfg. moulding die outline housing to add the TiC powder, the tool steel powder mean particle sizes is 30 μ m, TiC powder particle particle mean size is 3 μ m, the tool steel powder evenly mixes according to 20: 1 ratio of volume ratio with TiC powder powder, mould outline thickness of shell is 3mm, and the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
Mould manufacturing method kind of the present invention, the material and the technological parameter of mould outline housing processing and implementation example 3 are;
(1) adopt the material selection tool steel powder of selective laser fusing manufacturing process (SLM) mfg. moulding die outline housing to add the WC powder particle, the tool steel powder mean particle sizes is 45 μ m, the WC powder average particle size is 2 μ m, the tool steel powder evenly mixes according to 20: 1 ratio of volume ratio with WC powder, mould outline thickness of shell is 3mm, and the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque;
In the mould manufacturing method of the present invention, the material and the technological parameter of mould outline housing processing and implementation example 4 are;
(1) laser dissolves in the manufacturing process of method mfg. moulding die outline housing, and the material selection 93W-4.9Ni-2.1Fe of mould outline housing is the alloy composite powder, and alloy composite powder particle mean size is 45 μ m.The alloy composite powder evenly mixes according to volume ratio weight alloy percentage; Mould outline housing degree is decided to be 3mm, and the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
The present invention relates to single metal or metal alloy casting packing material is copper or aluminium alloy or mild steel.The technical indicator mainly considered of casting packing material is, the manufacturability of the thermal conductivity of material, the strength of materials, casting and with the metallurgical binding performance of the material of mould outline housing etc.According to the mechanical strength and the physical property of above-mentioned specification requirement and final mould, mould outline case material is carried out corresponding adjustment and collocation with the casting packing material.
Claims (5)
1. mould manufacturing method that has conformal cooling pipe is characterized in that: this mould manufacturing method adopts following steps to realize:
(1), adopt selective laser to melt the mould outline housing that manufacturing process is made single metal alloy powders or metallic element composite powder material and had design wall thickness, mould outline housing upper surface is a mold cavity, is the casting cavity filling in the mould outline housing;
(2), the shape of the mould outline housing upper surface mold cavity made according to step (1), it is the mould conformal cooling pipe that the space three-dimensional curve is provided with arbitrarily that correspondence manufactures and designs axis;
(3), the mold cools down pipeline that step (2) is made is installed in the mould outline housing of step (1) manufacturing, mould outline housing carries out preheating, uses method that copper or aluminium alloy or low-carbon steel material adopt casting with the filling of casting of the mold cools down pipeline and the gap of mould outline housing formation;
(4), have the mould outline housing and the casting filling part of conformal cooling pipe after step (3) casting filled, carry out whole Surface Finishing and handle.
2. a kind of mould manufacturing method that has conformal cooling pipe according to claim 1 is characterized in that:
(1), step (1) adopts in the manufacturing process of selective laser fusing manufacturing process mfg. moulding die outline housing, it is 40 μ m mould steel powder that the material of mould outline housing adopts particle mean size, mould outline housing design wall thickness is 3mm, be furnished with the optical fiber laser of the above power of 300W at SLM equipment, the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
3. a kind of mould manufacturing method that has conformal cooling pipe according to claim 1, it is characterized in that: (1), step (1) adopts in the manufacturing process of selective laser fusing manufacturing process mfg. moulding die outline housing, the material selection tool steel powder of mould outline housing and TiC powder, the tool steel powder mean particle sizes is 30 μ m, TiC powder particle particle mean size is 3 μ m, the tool steel powder evenly mixes according to 20: 1 ratio of volume ratio with TiC powder powder, mould outline thickness of shell is 3mm, be furnished with the optical fiber laser of the above power of 300W at SLM equipment, the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
4. a kind of mould manufacturing method that has conformal cooling pipe according to claim 1, it is characterized in that: (1), step (1) adopts in the manufacturing process of selective laser fusing manufacturing process mfg. moulding die outline housing, the material selection tool steel powder of mould outline housing and WC powder particle, the tool steel powder mean particle sizes is 45 μ m, the WC powder average particle size is 2 μ m, the tool steel powder evenly mixes according to 20: 1 ratio of volume ratio with WC powder, mould outline thickness of shell is 3mm, be furnished with the optical fiber laser of the above power of 300W at SLM equipment, the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
5. a kind of mould manufacturing method that has conformal cooling pipe according to claim 1, it is characterized in that: (1), step (1) adopts in the manufacturing process of selective laser fusing manufacturing process mfg. moulding die outline housing, the material selection 93W-4.9Ni-2.1Fe of mould outline housing is the metallic element composite powder, alloy composite powder particle mean size is 45 μ m, mould outline housing degree is decided to be 3mm, be furnished with the optical fiber laser of the above power of 300W at SLM equipment, the laser forming parameter is: laser power 150-200W, sweep span 0.08-0.12mm, sweep speed 500-1000mm/s, the thick 0.05-0.1mm of shop bisque.
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| CN2009101089191A CN101670437B (en) | 2009-07-20 | 2009-07-20 | Mould making method with conformal cooling pipe |
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| CN2009101089191A CN101670437B (en) | 2009-07-20 | 2009-07-20 | Mould making method with conformal cooling pipe |
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| CN101670437B true CN101670437B (en) | 2011-04-13 |
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