CN113102687A - Dieless casting mold with 3D printing framework and manufacturing method thereof - Google Patents

Dieless casting mold with 3D printing framework and manufacturing method thereof Download PDF

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Publication number
CN113102687A
CN113102687A CN202110514422.0A CN202110514422A CN113102687A CN 113102687 A CN113102687 A CN 113102687A CN 202110514422 A CN202110514422 A CN 202110514422A CN 113102687 A CN113102687 A CN 113102687A
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China
Prior art keywords
framework
box body
temperature
casting
wall
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CN202110514422.0A
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Chinese (zh)
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雷钧
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Shanxi Machinery Product Quality Supervision And Inspection Station Co ltd
Shanxi Mechanical And Electrical Design And Research Institute Co ltd
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Shanxi Machinery Product Quality Supervision And Inspection Station Co ltd
Shanxi Mechanical And Electrical Design And Research Institute Co ltd
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Priority to CN202110514422.0A priority Critical patent/CN113102687A/en
Publication of CN113102687A publication Critical patent/CN113102687A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • 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
    • 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
    • B33Y80/00—Products made by additive manufacturing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention provides a dieless casting mold with a 3D printing framework and a manufacturing method thereof. According to the invention, the upper framework and the lower framework which are printed in a 3D mode are adopted, so that the overall strength of the casting mold is increased, the problem of sand blank collapse and damage can not occur in the processing process, the yield of the casting mold is improved, meanwhile, the first cavity and the second cavity are respectively arranged in the upper framework and the lower framework according to the shape of a casting, the processing processes of sand blank milling, cavity milling and residual milling can be omitted, only high-contour milling is needed to finish the sand layer, the processing procedures are reduced, the processing efficiency is improved, the processing time is shortened, and the manufacturing cost is further reduced.

Description

Dieless casting mold with 3D printing framework and manufacturing method thereof
Technical Field
The invention relates to the technical field of die-free casting, in particular to a die-free casting mold with a 3D printing framework and a manufacturing method thereof.
Background
The high-quality complex casting is an important support for high-end equipment such as aerospace, power machinery and the like. The traditional sand casting needs the forming process of the moulds such as the wooden mould, the metal mould and the like, has the worldwide problems of multiple working procedures, long flow, difficult shape precise control, resource waste, poor quality stability and the like, can not meet the urgent requirements of multiple varieties, small batch, short period, high precision and high performance, and needs new casting forming method and equipment. This results in a dieless casting precision forming method that does not require a rigid mold.
The dieless casting technology is an advanced digital forming technology, with the rapid development of additive manufacturing, digitalization, material science and other technologies, the integrated design of 'material-processing technology-product performance' is to be realized in the future, the performance of the final product is taken as the leading factor, the material and processing technology parameters are optimally designed, the integration of the product design and manufacturing process is realized by means of CAD/CAE, VR and other software, and finally the 'shape control/property control' design and manufacturing of the sand mold/casting are realized.
At present, the invention with the authorization number of CN110252947B discloses a mould-free manufacturing method of a dry type clay sand casting mould, which discloses a sand blank manufacturing method, wherein one or more sand boxes are prefabricated according to the size of a sand mould sand core for standby, water, a bonding agent, additives, molding sand and the like are fully stirred and mixed by a sand mixer according to a certain proportion, mixed green sand is placed in the sand boxes, a pestle sand tool is used for pestling the green sand and scraping the green sand by a scraper plate, the green sand is placed in a drying device for drying, and one or more sand blanks are obtained after drying. The method is characterized in that a non-die casting precision forming machine is used for machining and forming, the machining process comprises sand blank milling, cavity milling, residual milling and contour milling with equal height, wherein the sand blank is manufactured in a bonding mode due to the fact that the sand blank has a large amount of medium sand, the problem that the sand blank is prone to collapse and damage in the machining process is solved, the machining process comprises sand blank milling, cavity milling, residual milling and contour milling with equal height, the machining process is multiple, machining time is long, and the problem that casting manufacturing cost is high exists.
Disclosure of Invention
The invention provides a die-free casting mold with a 3D printing framework and a manufacturing method thereof, which are used for solving the technical problems that in the manufacturing process of the existing casting mold, as the sand blank is manufactured in a bonding mode due to the fact that the sand blank has a large amount of medium sand, the sand blank is easy to collapse and damage in the processing process, and the processing process comprises sand blank milling, cavity milling, residual milling and contour milling of the same height, so that the processing procedures are more, the processing time is long, and the manufacturing cost of the casting mold is high.
In order to solve the technical problem, the invention discloses a dieless casting mold with a 3D printing framework, which comprises: go up skeleton and lower skeleton, it sets up first cavity to go up the skeleton lower surface, the skeleton upper surface sets up the second cavity down, first cavity with the second cavity surface all is provided with the sand bed, go up the skeleton lower surface with the laminating of skeleton upper surface down, first cavity with the second cavity concatenation constitutes the die cavity.
Preferably, go up the interior vertical pouring pipeline that is provided with of skeleton, pouring pipeline one end extends to go up the skeleton upper surface, the pouring pipeline other end runs through the sand bed and extends to in the first cavity, go up the skeleton upper surface pass through pouring pipeline with first cavity intercommunication.
Preferably, the upper surface of the upper framework is provided with a pouring gate, the lower end of the pouring gate is communicated with the pouring pipeline, and the cross sectional area of the lower end of the pouring gate is smaller than that of the upper end of the pouring gate.
Preferably, go up the skeleton with skeleton inside all is provided with a plurality of control by temperature change passageways down, both ends are all run through around the control by temperature change passageway go up skeleton front and back lateral wall with lateral wall around the lower skeleton, control by temperature change passageway cross-section is regular hexagon.
Preferably, go up the skeleton with skeleton inside still is provided with a plurality of ventilative passageways down, ventilative passageway one end with the sand bed is connected, the ventilative passageway other end with the inside intercommunication of control by temperature change passageway.
Preferably, still be provided with a plurality of first temperature sensor in the sand bed, first temperature sensor with ventilative passageway one-to-one, first temperature sensor with ventilative passageway is kept away from control by temperature change passageway one end is connected, first temperature sensor is used for detecting the gas temperature of ventilative passageway entry end.
Preferably, the method further comprises the following steps:
the heating device is arranged in the temperature control channel and used for heating air in the temperature control channel, and the heating device corresponds to the first temperature sensors one by one;
the second temperature sensor is arranged on the outer wall of the upper framework and used for detecting the ambient temperature outside the upper framework;
the temperature adjusting device is arranged in the temperature control channel and is electrically connected with the heating device, and the temperature adjusting device is used for adjusting the actual heating temperature of the heating device;
the timer is arranged on the outer wall of the upper framework and used for recording the cooling time of the casting in the cavity;
the controller is arranged on the outer wall of the upper framework and is electrically connected with the first temperature sensor, the heating device, the second temperature sensor, the temperature adjusting device and the timer respectively;
the controller controls the temperature adjusting device to adjust the actual heating temperature of the heating device based on the detection values of the first temperature sensor, the second temperature sensor and the timer, and comprises the following steps:
step 1: calculating a cooling degree value of the detection position of the ith first temperature sensor based on the detection values of the first temperature sensor and the timer:
Figure BDA0003057181330000031
wherein, KiA cooling degree value for the detection position of the ith first temperature sensor, 1 being a constant, S1Is the cross-sectional area, L, of the temperature control channel regular hexagon1Is the length of the temperature-controlled channel, t1The cooling time length t of the casting in the cavity recorded by the timer2A preset maximum cooling time of the casting in the cavity, ln is a natural logarithm, H1Is the cross-sectional height, T, of the temperature control channel regular hexagoniIs the detected temperature of the ith first temperature sensor, and n is the total number of the first temperature sensors;
step 2: calculating a target heating temperature of the i-th heating device by formula (2) based on the calculation result of formula (1) and the detection value of the second temperature sensor:
Figure BDA0003057181330000041
wherein, TMiIs the target heating temperature of the ith heating device, C1Is the specific heat capacity of the air in the temperature control channel, rho is the density of the air in the temperature control channel, V1Is the total volume in the temperature-controlled channel, T2For a maximum predetermined temperature, T, in the mould cavity1An ambient temperature, γ, outside the upper frame detected by the second temperature sensor1Is the heat transfer coefficient, omega, of the sand layer1Is the thermal conductivity of the sand layer, a1Is the thickness of the sand layer, S2Is the total heat-dissipating area, γ, of the sand layer2Is the heat exchange coefficient, omega, of the upper framework and the lower framework material2Is the thermal conductivity coefficient of the upper skeleton and the lower skeleton material, a2Is the average wall thickness, S, of the upper and lower skeletons3Is the outer wall surface area, γ, of the upper and lower skeletons3For exchanging air in said temperature-controlled channelsThermal coefficient, K0Presetting a comprehensive cooling degree value for the casting in the cavity;
and step 3: based on the calculation result of the formula (2), the controller controls the temperature adjustment device to adjust the actual heating temperature of the heating device, and adjusts the actual heating temperature of the ith heating device to the target heating temperature of the ith heating device.
Preferably, go up the skeleton with lower skeleton all adopts 3D printing technology to make and forms, go up the skeleton with lower skeleton material all adopts high temperature resistant material, go up the skeleton with lower skeleton is formed by a plurality of small-size skeletons concatenation combinations.
Preferably, the device further comprises a plurality of guiding devices, wherein the guiding devices comprise:
the upper end of the first box body is fixedly connected with the outer side wall of the upper framework, the lower end of the first box body extends to the outer side wall of the lower framework and is provided with a first opening, first through holes are symmetrically formed in the left side and the right side of the first box body, and the first through holes penetrate through the side wall of the first box body;
the outer wall of the second box body is fixedly connected with the outer side wall of the lower framework, the second box body is positioned in the first box body, the outer walls of the left side and the right side of the second box body are respectively connected with the inner walls of the left side and the right side of the first box body in a sliding mode, second through holes are symmetrically formed in the left side and the right side of the second box body, the second through holes penetrate through the side wall of the second box body, and the first through holes are communicated with the second through holes;
the third box body is arranged at the upper end of the second box body, the lower end of the third box body is fixedly connected with the upper end of the second box body, and the upper end of the third box body is provided with a third through hole;
the fourth through hole is formed in the upper end of the second box body, a sliding column is arranged in the fourth through hole, the outer wall of the sliding column is connected with the inner wall of the fourth through hole in a sliding mode, one end of the sliding column penetrates through the third through hole and extends to the position above the third box body, the other end of the sliding column extends into the second box body, and one end, located in the second box body, of the sliding column is arranged in a conical shape;
the two sliding plates are symmetrically arranged on the left side and the right side of the sliding column, the sliding plates respectively penetrate through the second through hole and the first through hole and are in sliding connection with the inner walls of the first through hole and the second through hole, one end of each sliding plate, which is close to the sliding column, is provided with a roller, and the outer wall of each roller is in contact with the outer wall of the lower end of the sliding column;
the fixed plate is arranged on the lower surface of the sliding plate and is perpendicular to the sliding plate, one side, close to the inner wall of the second box body, of the fixed plate is provided with a first spring, one end of the first spring is fixedly connected with the inner wall of the second box body, and the other end of the first spring is fixedly connected with the side wall of the fixed plate;
the limiting plate is arranged on the sliding column, the limiting plate is fixedly connected with the sliding column, and the outer wall of the limiting plate is in sliding connection with the inner wall of the third box body;
the second spring is sleeved on the sliding column, one end of the second spring is fixedly connected with the lower surface of the limiting plate, and the other end of the second spring is fixedly connected with the upper surface of the second box body;
the baffle is arranged in the first box body and positioned above the second box body, the outer wall of the baffle is in sliding connection with the inner wall of the first box body, and the lower surface of the baffle is in contact with the upper end of the sliding column;
the rack is arranged on the upper surface of the baffle plate, the lower end of the rack is fixedly connected with the upper surface of the baffle plate, the rear side wall of the rack is in sliding connection with the inner wall of the rear side of the first box body, and the front side wall of the rack is provided with teeth;
the gear is arranged on the front side of the rack, the gear is in transmission connection with the front side wall of the rack through the gear, a rotating shaft is arranged on the left side of the gear, one end, away from the gear, of the rotating shaft penetrates through the left side wall of the first box body, extends to the outside of the left side of the first box body and is provided with a knob, and the rotating shaft is in rotating connection with the left side wall of the first box body through a bearing;
spacing post, spacing post sets up the gear top, spacing post one end with rack side wall contact, the spacing post other end runs through first box right side wall extends to first box right side is outside and sets up the arm-tie, spacing post with first box right side wall sliding connection, the cover is equipped with the third spring on the spacing post, third spring one end with arm-tie lateral wall fixed connection, the third spring other end with first box right side outer wall fixed connection.
The manufacturing method of the die-less casting mold with the 3D printing framework is used for manufacturing the die-less casting mold with the 3D printing framework, and comprises the following steps:
step S1: three-dimensional process modeling: according to the shape of a casting to be cast, modeling is carried out by using three-dimensional software to obtain a casting three-dimensional model, the casting three-dimensional model is divided into an upper casting three-dimensional model and a lower casting three-dimensional model, a first contour is generated according to the upper casting three-dimensional model, a second contour is generated according to the lower casting three-dimensional model, and casting design is completed;
step S2: manufacturing an upper framework: printing an upper framework by using a 3D printer with the periphery of the first contour as a reference, wherein the contour of the first cavity in the upper framework is the same as the first contour in the printing process;
step S3: manufacturing a lower framework: using the periphery of the second contour as a reference, and printing a lower framework by using a 3D printer, wherein the contour of a second cavity in the lower framework is the same as the second contour in the printing process;
step S4: setting a sand layer: arranging a sand layer on the inner walls of the upper framework and the lower framework according to a preset thickness;
step S5: processing a sand layer: finish machining the surface of the sand layer by using an equal-height profile mill, wherein the feed amount of the equal-height profile mill is 0.1-0.3 mm, and after finish machining is finished, coating brushing and dip-coating treatment is carried out on the surface of the sand layer, and drying is carried out;
step S6: assembling an upper framework and a lower framework: after the surface of the sand layer is dried, the upper framework and the lower framework are assembled, so that an upper casting three-dimensional model in the upper framework and a lower casting three-dimensional model in the lower framework are combined into a whole casting three-dimensional model, and the upper framework and the outer wall of the lower framework are fastened and connected.
The technical scheme of the invention has the following advantages: the invention provides a dieless casting mold with a 3D printing framework and a manufacturing method thereof. According to the invention, the upper framework and the lower framework which are printed in a 3D mode are adopted, so that the overall strength of the casting mold is increased, the problem of sand blank collapse and damage can not occur in the processing process, the yield of the casting mold is improved, meanwhile, the first cavity and the second cavity are respectively arranged in the upper framework and the lower framework according to the shape of a casting, the processing processes of sand blank milling, cavity milling and residual milling can be omitted, only high-contour milling is needed to finish the sand layer, the processing procedures are reduced, the processing efficiency is improved, the processing time is shortened, and the manufacturing cost is further reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the apparatus particularly pointed out in the written description and drawings thereof.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of a mold for the dieless casting with a 3D printing skeleton according to the present invention;
FIG. 2 is a schematic view of the external structure of the guide device of the present invention;
FIG. 3 is a schematic view of the internal structure of the guide device of the present invention;
FIG. 4 is an enlarged view taken at A of FIG. 3 according to the present invention;
FIG. 5 is an enlarged view of the invention at B of FIG. 3;
FIG. 6 is an enlarged view of the invention at C in FIG. 3.
In the figure: 1. mounting a framework; 2. a lower framework; 3. a first cavity; 4. a second cavity; 5. a sand layer; 6. a cavity; 7. pouring a pipeline; 8. a pouring gate; 9. a temperature control channel; 10. a ventilation channel; 11. a first temperature sensor; 12. a first case; 13. a first through hole; 14. a second case; 15. a second through hole; 16. a third box body; 17. a third through hole; 18. a fourth via hole; 19. a sliding post; 20. a sliding plate; 21. a roller; 22. a fixing plate; 23. a first spring; 24. a limiting plate; 25. a second spring; 26. a baffle plate; 27. a rack; 28. a gear; 29. a rotating shaft; 30. a knob; 31. a bearing; 32. a limiting column; 33. pulling a plate; 34. and a third spring.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Example 1:
an embodiment of the present invention provides a mold-less casting mold with a 3D printing skeleton and a manufacturing method thereof, as shown in fig. 1 to 6, including: go up skeleton 1 and lower skeleton 2, go up skeleton 1 lower surface and set up first cavity 3, 2 upper surfaces of lower skeleton set up second cavity 4, first cavity 3 with 4 surfaces of second cavity all are provided with sand layer 5, go up skeleton 1 lower surface with the laminating of 2 upper surfaces of lower skeleton, first cavity 3 with 4 concatenations of second cavity constitute die cavity 6.
The working principle and the beneficial effects of the technical scheme are as follows: the invention provides a die-free casting mold with a 3D printing framework, which comprises an upper framework 1 and a lower framework 2, wherein the upper framework 1 and the lower framework 2 are both manufactured by adopting a 3D printing technology, a first cavity 3 is arranged in the upper framework 1, the first cavity 3 can be matched with the upper half part of the outer contour of a casting, a second cavity 4 can be matched with the lower half part of the outer contour of the casting, the upper framework 1 and the lower framework 2 are combined to form the casting mold so as to be matched with the casting, sand layers 5 are arranged on the surfaces of the first cavity 3 and the second cavity 4, the sand layers 5 are bonded and fixed on the surfaces of the first cavity 3 and the second cavity 4 by the prior art, then only the sand layers 5 are required to be subjected to finish machining by directly finish milling until the surface of the sand layers 5 reaches a preset precision, and the overall strength of the casting mold is increased by adopting the upper framework 1 and the lower framework 2 which are subjected to 3D printing, the problem of sand base collapse damage can not appear in the course of working, the casting mould qualification rate has been improved, simultaneously, set up first cavity 3 and second cavity 4 in upper frame 1 and lower frame 2 respectively according to the foundry goods shape, can save the sand base mill the processing procedure of milling flat, die cavity 6 mills, the rough milling and the semi-finish milling of surplus mill etc. only need use high profile mill to sand layer 5 finish machining can, machining process has been reduced greatly, machining efficiency is improved, it is long when reducing the processing, and then manufacturing cost has been reduced.
Example 2
On the basis of the embodiment 1, as shown in fig. 1, a pouring pipeline 7 is vertically arranged in the upper framework 1, one end of the pouring pipeline 7 extends to the upper surface of the upper framework 1, the other end of the pouring pipeline 7 penetrates through the sand layer 5 and extends into the first cavity 3, and the upper surface of the upper framework 1 is communicated with the first cavity 3 through the pouring pipeline 7;
the upper surface of the upper framework 1 is provided with a pouring gate 8, the lower end of the pouring gate 8 is communicated with the pouring pipeline 7, and the cross sectional area of the lower end of the pouring gate 8 is smaller than that of the upper end of the pouring gate 8.
The working principle and the beneficial effects of the technical scheme are as follows: be provided with pouring pipeline 7 in last skeleton 1, pouring pipeline 7 can set up to many, be connected with sprue gate 8 on pouring pipeline 7, 8 lower extreme cross-sectional areas of sprue gate are less than the upper end cross-sectional area, be convenient for casting in 8 inflow pouring pipeline 7 of liquid follow sprue gate, then pass 1 inflow die cavity 6 of last skeleton from pouring pipeline 7 again, until filling up die cavity 6 inside, through setting up a plurality of pouring pipelines 7, be convenient for casting can the omnidirectional flow in die cavity 6 with liquid, and simultaneously, can fill up die cavity 6 with higher speed, and the casting efficiency is improved.
Example 3
On the basis of embodiment 1, as shown in fig. 1, a plurality of temperature control channels 9 are respectively arranged inside the upper framework 1 and the lower framework 2, the front and rear ends of each temperature control channel 9 penetrate through the front and rear side walls of the upper framework 1 and the front and rear side walls of the lower framework 2, and the cross section of each temperature control channel 9 is a regular hexagon;
a plurality of ventilation channels 10 are further arranged inside the upper framework 1 and the lower framework 2, one end of each ventilation channel 10 is connected with the sand layer 5, and the other end of each ventilation channel 10 is communicated with the inside of the temperature control channel 9;
still be provided with a plurality of first temperature sensor 11 in the sand bed 5, first temperature sensor 11 with ventilative passageway 10 one-to-one, first temperature sensor 11 with ventilative passageway 10 is kept away from control by temperature change passageway 9 one end is connected, first temperature sensor 11 is used for detecting the gas temperature of ventilative passageway 10 entry end.
The working principle and the beneficial effects of the technical scheme are as follows: at last skeleton 1 with skeleton 2 inside all be provided with a plurality of control by temperature change passageway 9 down, control by temperature change passageway 9 and outside intercommunication, and can communicate recirculated cooling water in the control by temperature change passageway 9, thereby accelerate the cooling rate of casting mould, the cross-section of control by temperature change passageway 9 is regular hexagon, make control by temperature change passageway 9's surface area bigger, do benefit to and improve the radiating effect, thereby accelerate but, shorten the shaping time, regular hexagon's structure is still difficult for blockking up, and is convenient for clean, still be provided with first temperature sensor 11 in sand bed 5, first temperature sensor 11 can detect the gas temperature of ventilative passageway 10 entry end, first temperature sensor 11 is provided with a plurality ofly, thereby the real-time temperature of the different positions of foundry goods in monitoring die cavity 6, thereby judge the cooling rate of foundry goods, and adjust the cooling rate of foundry goods through letting in different amount of cooling water in control by temperature change passageway 9, The production of defects such as shrinkage cavity is favorable to improving the quality of product, reduces the disability rate of product, and still be provided with a plurality of ventilative passageways 10 in last skeleton 1 and lower skeleton 2 inside, in the casting process, the inside gas that produces of die cavity 6 can pass sand bed 5, and carry to the external environment in through ventilative passageway 10, increased the inside exhaust effect of die cavity 6, reduce the defect that reaction gas led to the fact the foundry goods, show the qualification rate that has improved the foundry goods, help reducing production cost.
Example 4
On the basis of embodiment 3, the method further comprises the following steps:
the heating device is arranged in the temperature control channel 9, is used for heating air in the temperature control channel 9, and corresponds to the first temperature sensors 11 one by one;
the second temperature sensor is arranged on the outer wall of the upper framework 1 and used for detecting the ambient temperature outside the upper framework 1;
the temperature adjusting device is arranged in the temperature control channel 9 and is electrically connected with the heating device, and the temperature adjusting device is used for adjusting the actual heating temperature of the heating device;
the timer is arranged on the outer wall of the upper framework 1 and used for recording the cooling time of the casting in the cavity 6;
the controller is arranged on the outer wall of the upper framework 1 and is electrically connected with the first temperature sensor 11, the heating device, the second temperature sensor, the temperature adjusting device and the timer respectively;
the controller controls the temperature adjusting device to adjust the actual heating temperature of the heating device based on the detection values of the first temperature sensor 11, the second temperature sensor and the timer, and comprises the following steps:
step 1: based on the detected values of the first temperature sensor 11 and the timer, a cooling degree value of the detection position of the ith first temperature sensor 11 is calculated:
Figure BDA0003057181330000111
wherein, KiA cooling degree value for the detection position of the ith first temperature sensor 11, 1 being a constant, S1Is the cross-sectional area, L, of the regular hexagon of the temperature control channel 91Is the length, t, of the temperature-controlled channel 91The cooling time, t, of the casting in the cavity 6 recorded by the timer2A preset maximum cooling time of the casting in the cavity 6, ln is a natural logarithm, H1Is the height of the cross section of the regular hexagon of the temperature control channel 9, TiIs the detected temperature of the ith first temperature sensor 11, and n is the total number of the first temperature sensors 11;
step 2: calculating a target heating temperature of the i-th heating device by formula (2) based on the calculation result of formula (1) and the detection value of the second temperature sensor:
Figure BDA0003057181330000121
wherein, TMiIs the target heating temperature of the ith heating device, C1For the temperature control ofThe specific heat capacity of the air in the channel 9, ρ is the density of the air in the temperature controlled channel 9, V1Is the total volume, T, in the temperature-controlled channel 92For a maximum preset temperature, T, in said cavity 61Ambient temperature, gamma, outside the upper frame 1 detected for the second temperature sensor1Is the heat transfer coefficient, omega, of the sand layer 51Is the thermal conductivity of the sand layer 5, a1Is the thickness, S, of the sand layer 52Is the total heat-dissipating area, γ, of the sand layer 52Is the heat exchange coefficient, omega, of the material of the upper framework 1 and the lower framework 22Is the thermal conductivity coefficient, a, of the material of the upper frame 1 and the lower frame 22Is the average wall thickness, S, of the upper frame 1 and the lower frame 23Is the surface area, gamma, of the outer wall of the upper frame 1 and the lower frame 23Is the heat transfer coefficient, K, of the air in the temperature control channel 90Presetting a comprehensive cooling degree value for the casting in the cavity 6;
and step 3: based on the calculation result of the formula (2), the controller controls the temperature adjustment device to adjust the actual heating temperature of the heating device, and adjusts the actual heating temperature of the ith heating device to the target heating temperature of the ith heating device.
The working principle and the beneficial effects of the technical scheme are as follows: the temperature control channel 9 is also internally provided with a heating device which can adopt a heating rod or a resistance wire, the heating device can heat the air in the temperature control channel 9, thereby adjusting the cooling speed of the casting in the cavity 6, and simultaneously, the heating device can also finish the heat treatment work of the casting in the cavity 6 by utilizing the heating of the heating device, because the first temperature sensors 11 are arranged in a plurality of numbers, and the detection positions of the first temperature sensors 11 are different, the temperature of each detection position is different, in order to ensure the uniform heating of the heating device, the target heating temperatures of the heating devices at different positions are different, the cooling process value of the detection position of the ith first temperature sensor 11 can be accurately calculated by the formula (1) through the detection values of the first temperature sensors 11 and the timer, the corresponding target heating temperature of the heating device can be calculated by the formula (2) aiming at different cooling process values, then the controller can control the temperature adjusting device to adjust the heating temperature of different heating devices, so that the actual heating temperature of different heating devices reaches different target heating temperatures, the real-time monitoring and adjustment of local temperature in the casting cooling and solidification process are realized, the metallographic structure of the casting is improved, the mechanical property of the casting is improved, meanwhile, the casting is subjected to heat treatment through the heating of the heating device, the casting is taken out after the traditional casting and is subjected to heat treatment, the production efficiency can be greatly improved, the generation of a surface oxide layer can be reduced, the energy loss can be saved while the quality of the casting is improved.
Example 5
On the basis of embodiment 1, go up skeleton 1 with lower skeleton 2 all adopts 3D printing technology to make and forms, go up skeleton 1 with lower skeleton 2 material all adopts high temperature resistant material, go up skeleton 1 with lower skeleton 2 forms by a plurality of small-size skeleton concatenation combinations.
The working principle and the beneficial effects of the technical scheme are as follows: go up skeleton 1 and lower skeleton 2 and all adopt the direct preparation of 3D printing technique to form, and all adopt high temperature resistant material, improved the heat resistance of going up skeleton 1 and lower skeleton 2, and go up skeleton 1 and lower skeleton 2 and all have a plurality of small-size skeleton concatenation combinations to form, reduced the volume of single skeleton, be favorable to using simple lathe just can accomplish the processing on sand bed 5 surface.
Example 6
On the basis of the embodiment 1, as shown in fig. 2 to 6, the device further comprises a plurality of guiding devices, wherein the guiding devices comprise:
the upper end of the first box body 12 is fixedly connected with the outer side wall of the upper framework 1, the lower end of the first box body 12 extends to the outer side wall of the lower framework 2 and is provided with a first opening, first through holes 13 are symmetrically formed in the left side and the right side of the first box body 12, and the first through holes 13 penetrate through the side wall of the first box body 12;
the outer wall of the second box body 14 is fixedly connected with the outer side wall of the lower framework 2, the second box body 14 is positioned in the first box body 12, the outer walls of the left side and the right side of the second box body 14 are respectively connected with the inner walls of the left side and the right side of the first box body 12 in a sliding manner, second through holes 15 are symmetrically arranged on the left side and the right side of the second box body 14, the second through holes 15 penetrate through the side wall of the second box body 14, and the first through holes 13 are communicated with the second through holes 15;
the third box 16 is arranged at the upper end of the second box 14, the lower end of the third box 16 is fixedly connected with the upper end of the second box 14, and the upper end of the third box 16 is provided with a third through hole 17;
the fourth through hole 18 is formed in the upper end of the second box 14, a sliding column 19 is arranged in the fourth through hole 18, the outer wall of the sliding column 19 is connected with the inner wall of the fourth through hole 18 in a sliding manner, one end of the sliding column 19 penetrates through the third through hole 17 and extends to the upper side of the third box 16, the other end of the sliding column 19 extends into the second box 14, and one end, located in the second box 14, of the sliding column 19 is conical;
the two sliding plates 20 are symmetrically arranged on the left side and the right side of the sliding column 19, the sliding plates 20 respectively penetrate through the second through hole 15 and the first through hole 13 and are in sliding connection with the inner walls of the first through hole 13 and the second through hole 15, one end of the sliding plate 20 close to the sliding column 19 is provided with a roller 21, and the outer wall of the roller 21 is in contact with the outer wall of the lower end of the sliding column 19;
the fixed plate 22 is arranged on the lower surface of the sliding plate 20, the fixed plate 22 is perpendicular to the sliding plate 20, a first spring 23 is arranged on one side of the fixed plate 22 close to the inner wall of the second box body 14, one end of the first spring 23 is fixedly connected with the inner wall of the second box body 14, and the other end of the first spring 23 is fixedly connected with the side wall of the fixed plate 22;
the limiting plate 24 is arranged on the sliding column 19, the limiting plate 24 is fixedly connected with the sliding column 19, and the outer wall of the limiting plate 24 is in sliding connection with the inner wall of the third box 16;
the second spring 25 is sleeved on the sliding column 19, one end of the second spring 25 is fixedly connected with the lower surface of the limiting plate 24, and the other end of the second spring 25 is fixedly connected with the upper surface of the second box 14;
the baffle 26 is arranged in the first box body 12, the baffle 26 is positioned above the second box body 14, the outer wall of the baffle 26 is in sliding connection with the inner wall of the first box body 12, and the lower surface of the baffle 26 is in contact with the upper end of the sliding column 19;
the rack 27 is arranged on the upper surface of the baffle 26, the lower end of the rack 27 is fixedly connected with the upper surface of the baffle 26, the rear side wall of the rack 27 is in sliding connection with the inner wall of the rear side of the first box 12, and the front side wall of the rack 27 is toothed;
the gear 28 is arranged on the front side of the rack 27, the gear 28 is in transmission connection with the front side wall of the rack 27 through the gear 28, a rotating shaft 29 is arranged on the left side of the gear 28, one end, far away from the gear 28, of the rotating shaft 29 penetrates through the left side wall of the first box 12, extends to the outside of the left side of the first box 12 and is provided with a knob 30, and the rotating shaft 29 is in rotation connection with the left side wall of the first box 12 through a bearing 31;
spacing post 32, spacing post 32 sets up the gear 28 top, spacing post 32 one end with the contact of rack 27 lateral wall, the spacing post 32 other end runs through first box 12 right side wall extends to first box 12 right side is outside and sets up arm-tie 33, spacing post 32 with first box 12 right side wall sliding connection, the cover is equipped with third spring 34 on the spacing post 32, third spring 34 one end with arm-tie 33 lateral wall fixed connection, the third spring 34 other end with first box 12 right side outer wall fixed connection.
The working principle and the beneficial effects of the technical scheme are as follows: when the upper framework 1 is arranged on the upper surface of the lower framework 2, the first opening at the lower end of the first box body 12 is aligned to the second box body 14, then the inner wall of the first box body 12 slides downwards along the outer wall of the second box body 14, then the lower surface of the baffle 26 is contacted with the upper end of the sliding column 19, in an initial state, the sliding plate 20 is positioned in the second through hole 15, under the action of the second spring 25, the limiting plate 24 is contacted with the inner wall at the upper end of the third box body 16, after the lower surface of the baffle 26 is contacted with the upper end of the sliding column 19, the upper framework 1 is completely placed on the lower framework 2, and the assembly of the upper framework 1 and the lower framework 2 is completed, at this time, the knob 30 is rotated, the rotation of the knob 30 can drive the rotation shaft 29 to rotate, the rotation of the rotation shaft 29 can drive the rotation of the gear 28 to drive the rotation of the rack 27 to slide downwards, the downward sliding, the limiting plate 24 can play a limiting role so as to limit the up-down sliding distance of the sliding column 19, the downward movement of the sliding column 19 drives the limiting plate 24 to slide in the third box 16, the limiting plate 24 can play a limiting role so as to limit the up-down sliding distance of the sliding column 19, the limiting plate 24 moves downward to compress the second spring 25, then the lower end of the sliding column 19 starts to extrude the two rollers 21 at the left and right sides, under the extrusion action of the conical lower end of the sliding column 19, the rollers 21 drive the sliding plate 20 to slide in the second through hole 15 towards the first through hole 13, the first spring 23 compresses, along with the gradual downward movement of the sliding column 19, the sliding plate 20 gradually slides into the first through hole 13, when the sliding plate 20 slides to the outer wall of the first box 12 from the end away from the rollers 21, the limiting column 32 contacts with the upper end of the rack 27, and under the action of the third spring 34, the limiting column 32 can, at this time, the knob 30 is stopped to rotate, the sliding plate 20 is located in the first through hole 13 and the second through hole 15, so that the second box body 14 is fixedly connected with the first box body 12, the upper framework 1 is stably installed on the lower framework 2, after casting is finished, the pulling plate 33 is pulled, the pulling plate 33 drives the limiting column 32 to move in the direction away from the rack 27, the third spring 34 is stretched, under the action of the second spring 25, the sliding column 19 moves upwards, the sliding column 19 gradually moves away from the roller 21, the roller 21 loses extrusion, under the action of the first spring 23, the first spring 23 drives the fixed plate 22 to move in the direction close to the sliding column 19, so as to drive the sliding plate 20 to slide out from the first through hole 13, at this time, the upper framework 1 can be taken down from the lower framework 2, the second box body 14 not only plays a guiding role on the first box body 12, which is beneficial to accurate installation of the upper framework 1, and the upper framework 1 can be stably connected with the lower framework 2 by rotating the knob 30, prevent to influence the casting quality because the skew takes place between last skeleton 1 and lower skeleton 2 in the casting process, therefore, through setting up guider, be favorable to going up the quick assembly disassembly between skeleton 1 and the lower skeleton 2, and is convenient and fast more, the production efficiency is improved, through spacing post 32 to the restriction of rack 27, can effectively avoid personnel's mistake to bump knob 30 and lead to going up skeleton 1 and taking place not hard up between the skeleton 2 down, guider is provided with a plurality ofly, set up the lateral wall that is different at last skeleton 1 and lower skeleton 2 respectively, and the guider dislocation set of preceding lateral wall and back lateral wall, the emergence of the contrary problem of last skeleton 1 dress has effectively been avoided, thereby the qualification rate of foundry goods has been improved, the manufacturing cost is further reduced.
The manufacturing method of the die-less casting mold with the 3D printing framework is used for manufacturing the die-less casting mold with the 3D printing framework, and comprises the following steps:
step S1: three-dimensional process modeling: according to the shape of a casting to be cast, modeling is carried out by using three-dimensional software to obtain a casting three-dimensional model, the casting three-dimensional model is divided into an upper casting three-dimensional model and a lower casting three-dimensional model, a first contour is generated according to the upper casting three-dimensional model, a second contour is generated according to the lower casting three-dimensional model, and casting design is completed;
step S2: manufacturing an upper framework 1: printing an upper framework 1 by using a 3D printer with the periphery of the first contour as a reference, wherein the contour of the first cavity 3 in the upper framework 1 is the same as the first contour in the printing process;
step S3: manufacturing a lower framework 2: using the periphery of the second contour as a reference, and printing a lower framework 2 by using a 3D printer, wherein the contour of the second cavity 4 in the lower framework 2 is the same as the second contour in the printing process;
step S4: setting a sand layer 5: arranging a sand layer 5 on the inner walls of the upper framework 1 and the lower framework 2 according to a preset thickness;
step S5: processing a sand layer 5: finish machining is carried out on the surface of the sand layer 5 by using an equal-height profile mill, the feeding amount of the equal-height profile mill is 0.1-0.3 mm, after finish machining is finished, coating brushing and dip-coating treatment are carried out on the surface of the sand layer 5, and drying is carried out;
step S6: assembling an upper framework 1 and a lower framework 2: after the surface of the sand layer 5 is dried, the upper framework 1 and the lower framework 2 are assembled, so that an upper casting three-dimensional model in the upper framework 1 and a lower casting three-dimensional model in the lower framework 2 are combined into a whole casting three-dimensional model, and the outer walls of the upper framework 1 and the lower framework 2 are fastened and connected.
The working principle and the beneficial effects of the technical scheme are as follows: the manufacturing method comprises the following steps: the method comprises the following steps of three-dimensional process modeling, upper framework 1 manufacturing, lower framework 2 manufacturing, sand layer 5 setting, sand layer 5 processing, and upper framework 1 and lower framework 2 assembling, and the specific manufacturing method comprises the following steps: firstly, modeling is carried out by using three-dimensional software according to the shape of a casting to be cast to obtain a casting three-dimensional model, the casting three-dimensional model is divided to be divided into an upper casting three-dimensional model and a lower casting three-dimensional model, a first processing program is generated according to the upper casting three-dimensional model, a second processing program is generated according to the lower casting three-dimensional model to complete the casting design, then, a 3D printer is used for printing an upper framework 1 by taking the periphery of a first contour as a reference, the contour of a first cavity 3 in the upper framework 1 is the same as the first contour in the printing process, a 3D printer is used for printing a lower framework 2 by taking the periphery of a second contour as a reference, the contour of a second cavity 4 in the lower framework 2 is the same as the second contour in the printing process, a sand layer 5 is arranged on the inner walls of the upper framework 1 and the lower framework 2 according to a preset thickness, the surface of the sand layer 5 is finely processed by using, the feeding amount of the contour milling with equal height is 0.1 mm-0.3 mm, after finishing, coating brushing and dip-coating treatment is carried out on the surface of a sand layer 5, drying is carried out, after the surface of the sand layer 5 is dried, an upper framework 1 and a lower framework 2 are assembled, so that an upper casting three-dimensional model in the upper framework 1 and a lower casting three-dimensional model in the lower framework 2 are combined into a whole casting three-dimensional model, and the outer walls of the upper framework 1 and the lower framework 2 are fastened and connected, at the moment, the casting manufacturing is finished, and the casting manufactured by the method has the advantages that the integral strength of the casting is improved due to the adoption of the upper framework 1 and the lower framework 2 which are printed in a 3D mode, the problem of sand blank collapse and damage does not occur in the processing process, the yield of the casting is improved, and meanwhile, the first cavity 3 and the second cavity 4 are respectively arranged in the upper framework 1 and the lower framework 2 according to the shape of a casting, so that, The machining processes of milling and residual milling of the cavity 6 only need to use contour milling with equal height to finish the sand layer 5, machining procedures are reduced, machining efficiency is improved, machining time is shortened, and manufacturing cost is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A dieless casting mold having a 3D printed framework, comprising: go up skeleton (1) and lower skeleton (2), it sets up first cavity (3) to go up skeleton (1) lower surface, skeleton (2) upper surface sets up second cavity (4) down, first cavity (3) with second cavity (4) surface all is provided with sand bed (5), go up skeleton (1) lower surface with the laminating of skeleton (2) upper surface down, first cavity (3) with second cavity (4) concatenation constitutes die cavity (6).
2. The mold-less casting mold with the 3D printing framework is characterized in that a pouring pipeline (7) is vertically arranged in the upper framework (1), one end of the pouring pipeline (7) extends to the upper surface of the upper framework (1), the other end of the pouring pipeline (7) penetrates through the sand layer (5) and extends into the first cavity (3), and the upper surface of the upper framework (1) is communicated with the first cavity (3) through the pouring pipeline (7).
3. The mold-less casting mold with a 3D printing framework according to claim 2, characterized in that the upper framework (1) is provided with a pouring gate (8) on the upper surface, the lower end of the pouring gate (8) is communicated with the pouring pipeline (7), and the cross-sectional area of the lower end of the pouring gate (8) is smaller than that of the upper end of the pouring gate (8).
4. The dieless casting mold with the 3D printing framework as claimed in claim 1, wherein a plurality of temperature control channels (9) are arranged inside the upper framework (1) and the lower framework (2), the front end and the rear end of each temperature control channel (9) penetrate through the front side wall and the rear side wall of the upper framework (1) and the front side wall and the rear side wall of the lower framework (2), and the cross section of each temperature control channel (9) is a regular hexagon.
5. The dieless casting mold with the 3D printing framework is characterized in that a plurality of air-permeable channels (10) are further arranged inside the upper framework (1) and the lower framework (2), one end of each air-permeable channel (10) is connected with the sand layer (5), and the other end of each air-permeable channel (10) is communicated with the inside of the temperature control channel (9).
6. The mold-free casting mold with the 3D printing framework is characterized in that a plurality of first temperature sensors (11) are further arranged in the sand layer (5), the first temperature sensors (11) correspond to the air-permeable channels (10) in a one-to-one mode, the first temperature sensors (11) are connected with one ends, far away from the temperature-controlled channel (9), of the air-permeable channels (10), and the first temperature sensors (11) are used for detecting the gas temperature at the inlet ends of the air-permeable channels (10).
7. The mold-less casting mold with a 3D printed skeleton according to claim 6, further comprising:
the heating device is arranged in the temperature control channel (9), is used for heating air in the temperature control channel (9), and corresponds to the first temperature sensors (11) one by one;
the second temperature sensor is arranged on the outer wall of the upper framework (1) and used for detecting the ambient temperature outside the upper framework (1);
the temperature adjusting device is arranged in the temperature control channel (9), is electrically connected with the heating device and is used for adjusting the actual heating temperature of the heating device;
the timer is arranged on the outer wall of the upper framework (1) and used for recording the cooling time of the casting in the cavity (6);
the controller is arranged on the outer wall of the upper framework (1), and is electrically connected with the first temperature sensor (11), the heating device, the second temperature sensor, the temperature adjusting device and the timer respectively;
the controller controls the temperature adjusting device to adjust the actual heating temperature of the heating device based on the detection values of the first temperature sensor (11), the second temperature sensor and the timer, and comprises the following steps:
step 1: calculating a cooling degree value of the detection position of the ith first temperature sensor (11) based on the detection values of the first temperature sensor (11) and the timer:
Figure FDA0003057181320000021
wherein, KiA cooling degree value of a detection position of the ith first temperature sensor (11), 1 is a constant, S1Is the cross-sectional area, L, of a regular hexagon of the temperature control channel (9)1Is the length, t, of the temperature-controlled channel (9)1The cooling time, t, of the casting in the cavity (6) recorded by the timer2For a preset maximum cooling time of the casting in the cavity (6), ln is a natural logarithm, H1Is the cross-sectional height, T, of the regular hexagon of the temperature control channel (9)iIs the detected temperature of the ith first temperature sensor (11), and n is the total number of the first temperature sensors (11);
step 2: calculating a target heating temperature of the i-th heating device by formula (2) based on the calculation result of formula (1) and the detection value of the second temperature sensor:
Figure FDA0003057181320000031
wherein, TMiIs the target heating temperature of the ith heating device, C1Is the specific heat capacity of the air in the temperature control channel (9), rho is the density of the air in the temperature control channel (9), V1Is the total volume, T, in the temperature-controlled channel (9)2For a maximum preset temperature, T, in the cavity (6)1An ambient temperature, gamma, outside the upper frame (1) detected for the second temperature sensor1Is the heat transfer coefficient, omega, of the sand layer (5)1Is the thermal conductivity of the sand layer (5), a1Is the thickness, S, of the sand layer (5)2Is the total heat dissipation area, gamma, of the sand layer (5)2Is the heat exchange coefficient, omega, of the materials of the upper framework (1) and the lower framework (2)2Is the thermal conductivity coefficient of the materials of the upper framework (1) and the lower framework (2), a2Is the average wall thickness, S, of the upper frame (1) and the lower frame (2)3Is the surface area, gamma, of the outer wall of the upper framework (1) and the lower framework (2)3Is the heat exchange coefficient, K, of the air in the temperature control channel (9)0Presetting a comprehensive cooling degree value for the casting in the cavity (6);
and step 3: based on the calculation result of the formula (2), the controller controls the temperature adjustment device to adjust the actual heating temperature of the heating device, and adjusts the actual heating temperature of the ith heating device to the target heating temperature of the ith heating device.
8. The dieless casting mold with the 3D printing framework as claimed in claim 1, wherein the upper framework (1) and the lower framework (2) are both made by 3D printing technology, the upper framework (1) and the lower framework (2) are both made of high temperature resistant material, and the upper framework (1) and the lower framework (2) are both made by splicing and combining a plurality of small frameworks.
9. The mold-less casting mold with a 3D printing skeleton of claim 1, further comprising a plurality of guiding means, the guiding means comprising:
the upper end of the first box body (12) is fixedly connected with the outer side wall of the upper framework (1), the lower end of the first box body (12) extends to the outer side wall of the lower framework (2) and is provided with a first opening, first through holes (13) are symmetrically formed in the left side and the right side of the first box body (12), and the first through holes (13) penetrate through the side wall of the first box body (12);
the outer wall of the second box body (14) is fixedly connected with the outer side wall of the lower framework (2), the second box body (14) is positioned in the first box body (12), the outer walls of the left side and the right side of the second box body (14) are respectively in sliding connection with the inner walls of the left side and the right side of the first box body (12), second through holes (15) are symmetrically formed in the left side and the right side of the second box body (14), the second through holes (15) penetrate through the side wall of the second box body (14), and the first through holes (13) are communicated with the second through holes (15);
the third box body (16), the third box body (16) is arranged at the upper end of the second box body (14), the lower end of the third box body (16) is fixedly connected with the upper end of the second box body (14), and the upper end of the third box body (16) is provided with a third through hole (17);
the fourth through hole (18) is formed in the upper end of the second box body (14), a sliding column (19) is arranged in the fourth through hole (18), the outer wall of the sliding column (19) is in sliding connection with the inner wall of the fourth through hole (18), one end of the sliding column (19) penetrates through the third through hole (17) and extends to the position above the third box body (16), the other end of the sliding column (19) extends into the second box body (14), and one end, located in the second box body (14), of the sliding column (19) is arranged in a conical shape;
the two sliding plates (20) are symmetrically arranged on the left side and the right side of the sliding column (19), the sliding plates (20) respectively penetrate through the second through hole (15) and the first through hole (13) and are in sliding connection with the inner walls of the first through hole (13) and the second through hole (15), one end, close to the sliding column (19), of each sliding plate (20) is provided with a roller (21), and the outer wall of each roller (21) is in contact with the outer wall of the lower end of the sliding column (19);
the fixed plate (22), the fixed plate (22) is arranged on the lower surface of the sliding plate (20), the fixed plate (22) is perpendicular to the sliding plate (20), one side, close to the inner wall of the second box body (14), of the fixed plate (22) is provided with a first spring (23), one end of the first spring (23) is fixedly connected with the inner wall of the second box body (14), and the other end of the first spring (23) is fixedly connected with the side wall of the fixed plate (22);
the limiting plate (24), the limiting plate (24) is arranged on the sliding column (19), the limiting plate (24) is fixedly connected with the sliding column (19), and the outer wall of the limiting plate (24) is in sliding connection with the inner wall of the third box body (16);
the second spring (25) is sleeved on the sliding column (19), one end of the second spring (25) is fixedly connected with the lower surface of the limiting plate (24), and the other end of the second spring (25) is fixedly connected with the upper surface of the second box body (14);
the baffle (26) is arranged in the first box body (12), the baffle (26) is positioned above the second box body (14), the outer wall of the baffle (26) is in sliding connection with the inner wall of the first box body (12), and the lower surface of the baffle (26) is in contact with the upper end of the sliding column (19);
the rack (27) is arranged on the upper surface of the baffle plate (26), the lower end of the rack (27) is fixedly connected with the upper surface of the baffle plate (26), the rear side wall of the rack (27) is in sliding connection with the inner wall of the rear side of the first box body (12), and the front side wall of the rack (27) is toothed;
the gear (28) is arranged on the front side of the rack (27), the gear (28) is in transmission connection with the front side wall of the rack (27) through the gear (28), the left side of the gear (28) is provided with a rotating shaft (29), one end, far away from the gear (28), of the rotating shaft (29) penetrates through the left side wall of the first box body (12), extends to the outside of the left side of the first box body (12) and is provided with a knob (30), and the rotating shaft (29) is in rotating connection with the left side wall of the first box body (12) through a bearing (31);
spacing post (32), spacing post (32) set up gear (28) top, spacing post (32) one end with rack (27) lateral wall contact, spacing post (32) other end runs through first box (12) right side wall extends to first box (12) right side outside sets up arm-tie (33), spacing post (32) with first box (12) right side wall sliding connection, the cover is equipped with third spring (34) on spacing post (32), third spring (34) one end with arm-tie (33) lateral wall fixed connection, third spring (34) other end with first box (12) right side outer wall fixed connection.
10. A method of manufacturing a moldless casting mold with a 3D printed skeleton for manufacturing a moldless casting mold with a 3D printed skeleton according to any one of claims 1 to 9, comprising the steps of:
step S1: three-dimensional process modeling: according to the shape of a casting to be cast, modeling is carried out by using three-dimensional software to obtain a casting three-dimensional model, the casting three-dimensional model is divided into an upper casting three-dimensional model and a lower casting three-dimensional model, a first contour is generated according to the upper casting three-dimensional model, a second contour is generated according to the lower casting three-dimensional model, and casting design is completed;
step S2: manufacturing an upper framework (1): printing an upper framework (1) by using a 3D printer with the periphery of the first contour as a reference, wherein the contour of the first cavity (3) in the upper framework (1) is the same as the first contour in the printing process;
step S3: making a lower framework (2): using the periphery of the second contour as a reference, and printing a lower framework (2) by using a 3D printer, wherein the contour of the second cavity (4) in the lower framework (2) is the same as the second contour in the printing process;
step S4: setting a sand layer (5): arranging a sand layer (5) on the inner walls of the upper framework (1) and the lower framework (2) according to a preset thickness;
step S5: processed sand layer (5): finish machining is carried out on the surface of the sand layer (5) by using an equal-height profile mill, the feeding amount of the equal-height profile mill is 0.1-0.3 mm, after finish machining is finished, coating brushing and dip-coating treatment are carried out on the surface of the sand layer (5), and drying is carried out;
step S6: assembling the upper framework (1) and the lower framework (2): after the surface of the sand layer (5) is dried, the upper framework (1) and the lower framework (2) are assembled, so that an upper casting three-dimensional model in the upper framework (1) and a lower casting three-dimensional model in the lower framework (2) are combined into a whole casting three-dimensional model, and the upper framework (1) and the outer wall of the lower framework (2) are fastened and connected.
CN202110514422.0A 2021-05-10 2021-05-10 Dieless casting mold with 3D printing framework and manufacturing method thereof Pending CN113102687A (en)

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