Equipment and method special for equal-density model capable of efficiently obtaining hot melting material

Abstract

The invention discloses special equipment and method for an equal-density model capable of efficiently obtaining a hot melting material. The equipment comprises a main rack, a shell metal plate is arranged outside the main rack, and a mold locking rack is fixedly installed on the top face of the main rack; a cooling paste-making unit is arranged in the main frame, and is connected with a material preparation cylinder and a high-temperature wax liquid insulation barrel; and a wax injection cylinder, a low-temperature hot oil circulating system, a high-temperature hot oil circulating system and an electric control system are arranged in the mold locking rack. The device is compact and reasonable in structure and convenient to operate, and can effectively solve the problems that a wax model is large in density fluctuation shrinkage rate difference, high in wax injection action precision control difficulty and low in production efficiency through mutual cooperation among the cooling paste making unit, the material preparation cylinder, the wax injection cylinder, the mold locking electric cylinder, the electric control system, the low-temperature hot oil circulating system, the high-temperature hot oil circulating system and the like. In order to solve the problems of frequent maintenance work, high energy consumption and the like of a hydraulic system, the hot melt isodensity model can be obtained by adopting the mode of no hydraulic system work and low energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of investment casting processes, and in particular to a special device and method for efficiently obtaining an isodensity model of a hot-melt material. Background Art

[0002] During the investment casting process, a wax-based hot-melt material is required to make a model of the target part. Then, after making multiple layers of refractory coatings on the surface of the wax mold and semi-drying, it is necessary to heat the mold assembly to melt the master mold wax and separate it from the refractory shell layer to form a cavity mold shell (the term "dewaxing"). After the dewaxed cavity mold shell is ceramized by high-temperature roasting, it obtains sufficient high-temperature resistance characteristics. Liquid metal is injected into it, cooled and solidified to form a whole casting string with a gating system, and then the target part is separated from the casting string through a cutting process.

[0003] Currently, in the prior art, the pressure injection method is mostly used to extrude a wax-based hot-melt material at a specific temperature under a specific pressure into the mold cavity, and the model is taken out after cooling and solidification.

[0004] By relying on the equipment to control the temperature, pressure, and pressure holding time, a wax model within a specific density range is obtained.

[0005] A. In the above method, the high-temperature wax liquid (80 - 90°C) from the wax liquid storage tank is cooled to form a paste or paste-like hot-melt body (60 - 65°C), enters the heat-insulated wax injection cylinder for standby, and then under pressure (2.0 - 3.5 MPa), it is directly extruded into the mold cavity through the heat-insulated pipeline. It is very difficult to achieve uniform and high-precision temperature control of the hot-melt body during this process. Temperature deviation causes great changes in the characteristics of the hot-melt body, such as viscosity, fluidity, density, etc.

[0006] The main influencing factors are as follows:

[0007] 1. The heat-insulated pipeline commonly uses a resistance heating tape, and there are thermal shocks and actual temperature measurement deviations in the temperature control system, resulting in temperature fluctuations;

[0008] 2. The heat-insulated pipeline conducts heat from the outside to the inside, and the temperatures at different diameters in the radial cross-section of the hot-melt body inside the pipeline are different, which is especially obvious when the pipeline diameter is large;

[0009] 3. During the process of cooling the high-temperature wax liquid to form a paste or paste-like hot-melt body, it relies on the natural conduction and heat dissipation insulation between the heat-conducting oil set at a certain temperature and the wax delivery pipeline. When making workpieces with a large wax consumption, it is impossible to provide a paste or paste-like hot-melt body with uniform temperature for a long time, resulting in a large difference in the shrinkage rate of the wax models produced continuously;

[0010] B. The above method commonly uses a hydraulic system to provide the mold clamping force and the driving force of the wax injection cylinder piston. The response speed of the hydraulic system is relatively low, and it is difficult to accurately control the wax injection action (speed curve);

[0011] C. The above method relies on the driving force of the wax injection cylinder piston provided by the hydraulic system to maintain the pressure of the hot melt in the entire wax conveying pipeline. The amount of hot melt that can be squeezed into the mold cavity depends on the pressure and temperature. When these two parameters fluctuate, the viscosity, fluidity of the hot melt in the wax conveying pipeline and the friction coefficient with the pipe wall change, and the amount of hot melt squeezed into the mold cavity also fluctuates, resulting in changes in the density of the wax model;

[0012] D. The above hydraulic system has problems such as pressure fluctuations, oil leakage, and the need for maintenance work such as replacing aging sealing rings, which affect production;

[0013] E. In addition to providing thrust during the wax injection action, the above hydraulic system also needs to run continuously in standby mode and dissipate heat through additional circulating cooling water, resulting in high energy consumption;

[0014] F. The above hydraulic system needs to simultaneously consider the different operation controls of 2-3 hydraulic cylinders (wax extraction, wax injection, mold clamping). With only one power source, it is difficult to achieve precise individual control. If multiple power sources are used, it will increase the occupied space, manufacturing cost and operating cost. Summary of the Invention

[0015] In view of the above-mentioned shortcomings in the existing production technology, the applicant provides a special device and method for efficiently obtaining an isodensity model of a hot melt material, thereby effectively solving problems such as large differences in the density fluctuations and shrinkage rates of wax models, difficult precise control of the wax injection action (speed curve), frequent maintenance work of the hydraulic system, and high energy consumption. It uses a non-hydraulic system to work and can obtain an isodensity model of the hot melt with low energy consumption.

[0016] The technical solution adopted by the present invention is as follows:

[0017] A special device for efficiently obtaining an isodensity model of a hot melt material, including a main frame, an outer shell sheet metal is arranged outside the main frame, and a mold clamping frame is fixedly installed on the top surface of the main frame; a cooling and paste making unit is arranged inside the main frame, and the cooling and paste making unit is connected to a stock preparation cylinder and a high-temperature wax liquid insulation barrel; a wax injection cylinder, a low-temperature hot oil circulation system, a high-temperature hot oil circulation system and an electric control system are arranged inside the mold clamping frame.

[0018] Its further technical solution lies in:

[0019] The structure of the cooling paste-making unit is as follows: It includes a hot air blower fixedly installed at the upper layer of the main frame, and a heat preservation box fixedly installed at the lower layer of the main frame. The heat preservation box is divided into upper and lower parts by a baffle with through holes. In the lower space, multiple serpentine coils are arranged. At the same time, an air inlet is provided on the side of the lower space, and the air inlet is connected to the first air outlet of the hot air blower through an air supply pipe; in the upper space, a first surface cooler and a second surface cooler are installed at intervals. The inlets of the first surface cooler and the second surface cooler are correspondingly attached to the through holes on the baffle. At the same time, a second air outlet is provided on the side of the upper space, and the second air outlet is connected to the air return port of the hot air blower through an air return pipe; the feed port flange is arranged outside the heat preservation box and is connected to the inlet of the serpentine coil. The first low-temperature heat preservation wax conveying pipe, which is in a tee shape, is also arranged outside the heat preservation box. The first low-temperature heat preservation wax conveying pipe is respectively connected to the outlet of the serpentine coil, the first discharge port flange, and the second discharge port flange. The heat preservation layer of the first low-temperature heat preservation wax conveying pipe is connected to the low-temperature hot oil circulation system.

[0020] A flow-limiting mandrel is arranged in the straight pipe of the serpentine coil, and the flow-limiting mandrel is welded to the inner wall surface of the serpentine coil through a fixture.

[0021] The structure of the preparation cylinder is as follows: It includes a cylinder base fixed on the main frame. A cylinder barrel with a heat preservation layer is fitted in the middle of the cylinder base. The bottom of the cylinder barrel with a heat preservation layer is connected to the first high-temperature heat preservation wax conveying pipe through the first inlet and outlet flange. The first high-temperature heat preservation wax conveying pipe is respectively connected to the feed port flange and the second high-temperature heat preservation wax conveying pipe. The second high-temperature heat preservation wax conveying pipe is installed on the high-temperature wax liquid heat preservation barrel; a first piston is installed in the cylinder barrel with a heat preservation layer. The head of the first piston is connected to a preparation electric cylinder. At the same time, the preparation electric cylinder is vertically installed on the top of the cylinder base, and the telescopic rod of the preparation electric cylinder is fixed to the first piston.

[0022] The structure of the wax injection cylinder is as follows: It includes a cylinder frame platform. A horizontal movement system is installed below the cylinder frame platform, and a vertical lifting system is installed below the horizontal movement system. Above the top plate of the cylinder frame platform, the end parts of the telescopic rods of the first wax injection electric cylinder and the second wax injection electric cylinder and the tail end of the second piston are connected simultaneously by a wax injection transmission connecting plate; a secondary core telescopic system and a tertiary core telescopic system are installed above the cylinder frame platform;

[0023] The structure of the vertical lifting system is as follows: It includes a first servo electric slide table, a second servo electric slide table, a third servo electric slide table, a fourth servo electric slide table, and a conversion frame. Symmetric first vertical plates and second vertical plates are arranged on the mold clamping frame. The first servo electric slide table and the second servo electric slide table are installed on the first vertical plate, and the third servo electric slide table and the fourth servo electric slide table are installed on the second vertical plate. The two side surfaces of the conversion frame are respectively connected to the sliders of the four servo electric slide tables;

[0024] The structure of the horizontal movement system is as follows: It includes a fifth servo electric slide and a sixth servo electric slide installed on the top surface of the conversion frame. The bottom plate of the cylinder frame platform is connected to the sliders of the fifth servo electric slide and the sixth servo electric slide. The cylinder body is vertically installed in the middle part below the top plate of the cylinder frame platform. The first wax injection electric cylinder and the second wax injection electric cylinder are vertically installed on both sides of the cylinder body below the top plate of the cylinder frame platform. The second piston is placed inside the cylinder body.

[0025] The structure of the secondary core telescopic system is as follows: It includes a cylinder fixing frame fixed on the bottom plate of the cylinder frame platform. The first secondary core cylinder and the second secondary core cylinder are installed on the cylinder fixing frame. The secondary core rod is horizontally inserted into the cylinder body. The ends of the telescopic rods of the first secondary core cylinder and the second secondary core cylinder and the tail end of the secondary core rod are connected by a secondary core transmission connecting frame. The first linear guide rail and the second linear guide rail are fixedly installed on the bottom plate of the cylinder frame platform. The first slider and the second slider are fitted with the first linear guide rail and the second linear guide rail. The lower part of the secondary core transmission connecting frame is connected to the first slider and the second slider.

[0026] The structure of the tertiary core telescopic system is as follows: It includes a tertiary core rod and a tertiary core cylinder. The tertiary core cylinder is installed on the secondary core transmission connecting frame. The end of the telescopic rod of the tertiary core cylinder is threadedly connected to the tail end of the tertiary core rod. The tertiary core rod is horizontally inserted into the secondary core rod.

[0027] The low-temperature hot oil circulation system includes a hot oil tank, a first hot oil pump, an electric heater, a temperature control meter and oil pipes. The first hot oil pump extracts the heat-conducting oil in the hot oil tank, transports it to the insulation layer and then returns to the hot oil tank. The electric heater is controlled by the temperature control meter to heat, so that the temperature of the heat-conducting oil in the hot oil tank is stabilized within the set range.

[0028] The high-temperature hot oil circulation system directly extracts the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel by using a second hot oil pump, transports it to each insulation layer and then returns to the interlayer. A polyimide heating film is attached to the outer surface of the high-temperature wax liquid insulation barrel. The temperature control meter controls the polyimide heating film to heat the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel, so that the temperature of the heat-conducting oil is stabilized within the set range.

[0029] The main frame is of a frame structure.

[0030] A method for efficiently obtaining an isodensity model of a hot-melt material includes the following operation process:

[0031] S1. Turn on the low-temperature hot oil circulation system to make the temperature reach the set value T1;

[0032] S2. Turn on the high-temperature hot oil circulation system to make the temperature reach the set value T2;

[0033] S3. Start the hot air blower and set the temperature T3 = T1 + 2;

[0034] S4. Start the intelligent control unit to moderately open the cooling water circulation in the surface cooler for cooling until the temperature of the hot melt in the multi-layer serpentine coil reaches equilibrium with the hot air temperature, and then completely close the cooling water circulation in the surface cooler;

[0035] S5. Draw materials from the feeding cylinder:

[0036] Open the pneumatic ball valve with heat-insulating layer No. 1 and close the pneumatic ball valve with heat-insulating layer No. 2. The inner cavity of the cylinder with heat-insulating layer is only connected to the inner cavity of the high-temperature wax liquid heat-insulating bucket. Start the position drive control mode of the feeding electric cylinder, set the output force F1, drive the piston No. 1 to move upward by a distance L1, the diameter of the piston No. 1 of the cylinder with heat-insulating layer is D1, and extract the volume of high-temperature wax liquid V1 = L1πD1 2 / 4 for standby;

[0037] S6. Discharge materials from the feeding cylinder:

[0038] Close the pneumatic ball valve with heat-insulating layer No. 1 and open the pneumatic ball valve with heat-insulating layer No. 2. The inner cavity of the cylinder with heat-insulating layer is only connected to the feeding port of the serpentine coil of the cooling paste-making unit. Start the torque drive control mode of the feeding electric cylinder, set the torque T a , drive the piston No. 1 to move downward by a distance L1, the diameter of the piston No. 1 of the cylinder with heat-insulating layer is D1, and extrude the volume of high-temperature wax liquid V1 = L1πD1 2 / 4 into the cooling paste-making unit;

[0039] S7: Repeat S5 and S6 until the cylinder with heat-insulating layer, the serpentine coil, and the three low-temperature heat-insulating wax conveying pipes are filled with hot melt;

[0040] S8: At this time, the pneumatic ball valve with heat-insulating layer No. 1 is in the closed state, the pneumatic ball valve with heat-insulating layer No. 2 is in the open state, the pneumatic ball valve with heat-insulating layer No. 3 is in the open state, and the pneumatic ball valve with heat-insulating layer No. 4 is in the closed state;

[0041] S9: Start the torque drive control mode of the mold clamping electric cylinder, set the torque T b , drive the moving template to move downward until the mold is locked;

[0042] S10: Start the up and down lifting system, adjust the position of the wax injection nozzle so that it is aligned with the wax injection port of the mold;

[0043] S11: Start the horizontal movement system, the torque drive control mode of the servo slide, set the torque Tc, move the wax injection nozzle to the wax injection port of the mold and make hard contact, and stop when the detected torque reaches Tc;

[0044] S12: Start the position drive control mode of the first wax injection electric cylinder and the second wax injection electric cylinder, set the output force F2, according to the volume V of the mold cavity in this time mSet the distance L2 for the second piston to move upward, the diameter D2 of the second piston in the cylinder block, and the volume V2 = L2πD2 2 / 4, V2 = V m *K - Ve, where K is the compression coefficient and V e is the compensation volume of the secondary core and the pneumatic ball valve section with a thermal insulation layer of the fourth belt;

[0045] S13: When the second piston starts to move upward, it causes a change in the overall volume of the stock preparation cylinder, pipeline, and wax injection cylinder. When the torque drive control mode of the stock preparation electric cylinder detects a decrease in torque, it drives the first piston of the stock preparation cylinder to move downward to compress the stock preparation cylinder and squeeze high-temperature wax liquid into the cooling paste-making unit. At the same time, the paste-like or paste-like hot melt in the cooling paste-making unit is extruded into the cylinder block until the second piston stops at the set L2. When the torque drive control mode of the stock preparation electric cylinder detects that the torque reaches Ta, it stops, and then closes the pneumatic ball valve with a thermal insulation layer of the third belt. At this time, the hot melt with a temperature of T1 and a volume of V2 is prepared in the cylinder block according to the setting;

[0046] S14: Open the pneumatic ball valve with a thermal insulation layer of the fourth belt. At this time, there is only a channel between the inner cavity of the cylinder block and the wax injection nozzle;

[0047] S15: Start the torque drive control modes of the first wax injection electric cylinder and the second wax injection electric cylinder, set the torque Td, and drive the second piston to move downward by a distance L2. It stops only when it detects that the torque reaches Td, that is, when the second piston makes hard contact with the bottom of the inner cavity of the cylinder block, ensuring that all the hot melt with a volume of V2 and a temperature of T1 is extruded from the inner cavity of the cylinder block. At this time, most of the hot melt is injected into the mold cavity, and a small amount remains in the internal injection pipe structure of the cylinder block and the wax injection nozzle;

[0048] S16: Start the secondary core telescopic system and the tertiary core telescopic system. The secondary core rod extends into the internal injection pipe structure of the cylinder block to squeeze the remaining hot melt into the mold cavity, and the tertiary core rod extends into the wax injection nozzle to squeeze the remaining hot melt into the mold cavity;

[0049] S17: After the secondary core and the tertiary core extend in place, turn on the vortex flow rapid cooler to introduce compressed air. The cold air enters the cooling cover and quickly cools the hot melt wax at the contact point between the wax injection nozzle and the entrance of the mold cavity into solid wax, which plays a role in sealing the mold cavity and preventing the internal hot melt wax from overflowing and reducing the density of the model;

[0050] S18: Maintain this state for a time T;

[0051] S19: Turn off the vortex flow rapid cooler;

[0052] S20: Retract the tertiary core;

[0053] S21: Retract the secondary core;

[0054] S22: Close the pneumatic ball valve with a thermal insulation layer of the fourth belt;

[0055] S23: Start the horizontal movement system to withdraw the wax injection nozzle;

[0056] S24: Start the clamping electric cylinder to move the upper template upward to release the clamping and open the mold to take out the model.

[0057] The beneficial effects of the present invention are as follows:

[0058] The structure of the present invention is compact and reasonable, and it is convenient to operate. Through the mutual cooperation of components such as the cooling paste-making unit, the material preparation cylinder, the wax injection cylinder, the clamping electric cylinder, the electric control system, the low-temperature hot oil circulation system, and the high-temperature hot oil circulation system, it can effectively solve the problems of large fluctuations in the density of wax models, large differences in shrinkage rates, difficult precise control of wax injection actions (speed curves), frequent maintenance work of the hydraulic system, and high energy consumption. It works without a hydraulic system and can obtain a melt of equal density with low energy consumption.

[0059] At the same time, the present invention also has the following advantages:

[0060] (1) The present invention uses a servo electric cylinder to provide the mold clamping force, the driving force of the material preparation cylinder piston, and the driving force of the wax injection cylinder piston, meeting the fast response of the wax injection action and the precise control of the speed curve, and avoiding the deficiencies of the hydraulic system.

[0061] (2) The present invention adopts a small-volume wax injection cylinder and a small piston diameter to meet the volume of each injection amount matching the mold cavity volume.

[0062] (3) The electric cylinder control mode of the wax injection cylinder described in the present invention adopts position drive to prepare a set volume of melt before injection.

[0063] (4) The present invention is provided with a material preparation cylinder. When only used for material preparation, the electric cylinder control mode adopts torque drive. As long as there is a material preparation requirement for the rear wax injection cylinder to move the piston, causing changes in the overall volume of the material preparation cylinder, pipeline, and wax injection cylinder, when the electric cylinder detects that the torque becomes smaller, it drives the piston to compress the material preparation cylinder to extrude high-temperature wax liquid into the cooling paste-making unit. At the same time, the paste-like or paste-shaped melt in the cooling paste-making unit is extruded into the wax injection cylinder.

[0064] When the wax injection cylinder is filled with paste-like melt, the electric cylinder of the material preparation cylinder detects that the torque reaches the set value and stops driving.

[0065] At this time, if the number of melts required for the mold cavity is greater than the maximum capacity of the wax injection cylinder, the electric cylinder control mode of the material preparation cylinder will immediately switch to position drive, and directly inject the melt with a volume difference into the mold cavity through the injection pipe of the wax injection cylinder. After that, the wax injection cylinder starts the normal wax injection action.

[0066] (5) The cooling and wax paste making unit of the present invention uses multi-layer serpentine coils arranged in a bottom-in and top-out manner in a heat-insulating box, with a hot air circulation forced cooling and heat preservation method. The hot air blower blows hot air at a set temperature (consistent with the required wax paste temperature) into the bottom of the heat-insulating box, rises to the top layer of the serpentine coils, then passes through the surface cooler, and then reaches the air return opening of the hot air blower. The high-temperature wax liquid enters the top layer of the serpentine coils in the heat-insulating box and gradually descends to the bottom layer of the coils and exits the heat-insulating box. Therefore, the relatively low-temperature hot air is heated when it rises through the multi-layer serpentine coils to the top layer. If it exceeds the set temperature of the hot air blower, the intelligent control unit moderately turns on the cooling water circulation in the surface cooler to cool down, so that the air return temperature meets the set value, and the hot air blower only needs to perform hot air circulation without heating. If the high-temperature wax liquid has not been used for a long time, the temperature of the melt in the multi-layer serpentine coils reaches equilibrium with the hot air temperature, the cooling water circulation of the surface cooler is completely turned off, and the hot air blower enters the heat preservation and heating mode.

[0067] (6) The serpentine coils used in the cooling and wax paste making unit of the present invention are provided with heat dissipation fins on the outer surface of the straight pipes to increase the heat exchange area. A flow-limiting mandrel is provided in each straight pipe to occupy the space inside the pipe, so that the melt in the pipe moves along the annular pipe space with a certain thickness formed by the mandrel and the inner wall of the pipe after being extruded, ensuring that the relatively thin melt fully exchanges heat with the outside of the pipe, avoiding the phenomenon that the melt in the core part cannot exchange heat in time and thus cooling or heating, and ensuring that the quality of the paste or paste-like melt is consistent.

[0068] (7) The injection system of the present invention is integrally designed with the wax injection cylinder, and uses a secondary core and a tertiary core to extrude all the prepared materials in the wax injection cylinder during each injection, ensuring that the melt entering the mold cavity with a fixed volume also has a fixed quantity, and the melt model obtained under the set temperature and pressure has the same density.

[0069] (8) After the secondary core and the tertiary core are in place and all the prepared materials in the wax injection cylinder are extruded, the vortex flow cooler installed at the wax injection nozzle starts to work, quickly cooling the melt wax at the contact part between the wax injection nozzle and the mold cavity inlet into solid wax, playing a role in sealing the mold cavity and preventing the internal melt wax from overflowing and flowing away, reducing the density of the model.

[0070] (9) The present invention separately sets up a low-temperature and low-heat oil circulation system and a high-temperature oil circulation system to meet different heat preservation requirements and accurately control the temperature of the melt.

[0071] (10) The high-temperature oil circulation system of the present invention directly uses the heat-conducting oil in the interlayer of the high-temperature wax liquid heat preservation barrel for circulation, and uses a polyimide heating film to be attached to the outer surface of the high-temperature wax liquid heat preservation barrel, with uniform heat distribution over a large area, without the need to separately set up heaters in other parts, and fully utilizes the heat of the high-temperature wax liquid itself, reducing power consumption. Description of the Drawings

[0072] Figure 1This is the front view of the present invention.

[0073] Figure 2 is Figure 1 the side view of.

[0074] Figure 3 is Figure 1 the top view of.

[0075] Figure 4 This is the installation schematic diagram of the cooling paste-making unit, the stock preparation cylinder and the high-temperature wax liquid heat preservation barrel of the present invention.

[0076] Figure 5 is Figure 4 the side view of.

[0077] Figure 6 is Figure 4 the top view of.

[0078] Figure 7 This is the front view of the wax injection cylinder of the present invention.

[0079] Figure 8 is Figure 7 the side view of.

[0080] Figure 9 is Figure 7 the top view of.

[0081] Wherein: 1. Main frame; 2. Mold clamping frame; 3. Outer shell sheet metal; 4. Cooling paste-making unit; 5. Stock preparation cylinder; 6. Wax injection cylinder; 9. First high-temperature heat preservation wax conveying pipeline; 10. Second high-temperature heat preservation wax conveying pipeline; 11. First low-temperature heat preservation wax conveying pipeline; 12. Second low-temperature heat preservation wax conveying pipeline; 13. Third low-temperature heat preservation wax conveying pipeline; 14. High-temperature wax liquid heat preservation barrel; 15. Stock preparation electric cylinder; 16. First wax injection electric cylinder; 17. Second wax injection electric cylinder; 18. Mold clamping electric cylinder; 19. Electric control system;

[0082] 20. Hot air blower; 21. First surface cooler; 22. Second surface cooler; 23. Serpentine coil; 24. Feed inlet flange; 25. First discharge outlet flange; 26. Second discharge outlet flange; 27. Air supply pipe; 28. Air return pipe; 29. Heat preservation box body; 30. Electric valve; 31. Circulating cooling water outlet; 32. Baffle; 33. Flow limiting mandrel; 34. Air inlet; 35. First air outlet; 36. Second air outlet; 37. Hot air blower air return port;

[0083] 38. Cylinder seat; 39. Cylinder barrel with heat preservation interlayer; 40. First piston; 41. First inlet and outlet flange; 42. First pneumatic ball valve with heat preservation interlayer; 43. Second pneumatic ball valve with heat preservation interlayer;

[0084] 44. Cylinder frame platform; 45. Up and down lifting system; 46. Horizontal moving system; 47. Cylinder block; 48. No. 2 piston; 49. Secondary core telescopic system; 50. Tertiary core telescopic system; 51. Wax injection nozzle; 52. No. 3 pneumatic ball valve with heat-insulating interlayer; 53. No. 4 pneumatic ball valve with heat-insulating interlayer; 54. Vortex flow rapid cooler;

[0085] 55. No. 1 servo electric slide; 56. No. 2 servo electric slide; 57. No. 3 servo electric slide; 58. No. 4 servo electric slide; 59. Conversion frame;

[0086] 60. No. 1 vertical plate; 61. No. 2 vertical plate; 62. No. 5 servo electric slide; 63. No. 6 servo electric slide; 64. Wax injection drive connection plate;

[0087] 65. Secondary core rod; 66. No. 1 secondary core cylinder; 67. No. 2 secondary core cylinder; 68. Cylinder fixing frame; 69. Secondary core drive connection frame; 70. No. 1 linear guide; 71. No. 2 linear guide; 72. No. 1 slider; 73. No. 2 slider;

[0088] 74. Tertiary core rod; 75. Tertiary core cylinder;

[0089] 76. No. 2 inlet and outlet flange;

[0090] 77. Flange blind plate;

[0091] 78. Side outlet flange; 79. Tail end flange;

[0092] 80. Cooling cover; 81. Hot oil tank; 82. No. 1 hot oil pump; 83. Electric heater; 84. No. 2 hot oil pump; 85. Polyimide heating film;

[0093] 901. No. 4 pipe orifice; 902. No. 5 pipe orifice; 903. No. 6 pipe orifice;

[0094] 1101. No. 1 pipe orifice; 1102. No. 2 pipe orifice; 1103. No. 3 pipe orifice. Detailed implementation manners

[0095] The following combines with the attached drawings to illustrate the detailed implementation manners of the present invention.

[0096] As Figures 1 - 9 shown, the special equipment for efficiently obtaining an isodensity model of a hot-melt material in this embodiment includes a main frame 1, an outer shell sheet metal 3 is arranged outside the main frame 1, and a mold clamping frame 2 is fixedly installed on the top surface of the main frame 1; a cooling and paste-making unit 4 is arranged inside the main frame 1, and the cooling and paste-making unit 4 is connected to a preparation cylinder 5 and a high-temperature wax liquid heat preservation barrel 14; a wax injection cylinder 6, a low-temperature hot oil circulation system, a high-temperature hot oil circulation system and an electric control system 19 are arranged inside the mold clamping frame 2.

[0097] The structure of the cooling paste-making unit 4 is as follows: It includes a hot air blower 20 fixedly installed at the upper layer of the main frame 1, and a heat preservation box 29 fixedly installed at the lower layer of the main frame 1. The heat preservation box 29 is divided into upper and lower parts by a baffle 32 with a through hole. A multi-layer serpentine coil 23 is arranged in the lower space. At the same time, an air inlet 34 is arranged on the side of the lower space. The air inlet 34 is connected to the first air outlet 35 of the hot air blower 20 through an air supply pipe 27. In the upper space, a first surface cooler 21 and a second surface cooler 22 are installed at intervals. The inlets of the first surface cooler 21 and the second surface cooler 22 are correspondingly attached to the through holes on the baffle 32. At the same time, a second air outlet 36 is arranged on the side of the upper space. The second air outlet 36 is connected to the hot air blower air return port 37 through a return air pipe 28. The feed port flange 24 is arranged outside the heat preservation box 29 and is connected to the inlet of the serpentine coil 23. The first low-temperature heat preservation wax conveying pipe 11 is in a tee shape and is also arranged outside the heat preservation box 29. The first low-temperature heat preservation wax conveying pipe 11 is respectively connected to the outlet of the serpentine coil 23, the first discharge port flange 25, and the second discharge port flange 26. The heat preservation interlayer of the first low-temperature heat preservation wax conveying pipe 11 is communicated with the low-temperature hot oil circulation system.

[0098] A flow-limiting mandrel 33 is arranged in the straight pipe of the serpentine coil 23. The flow-limiting mandrel 33 is welded to the inner wall surface of the serpentine coil 23 through a fixator.

[0099] The structure of the preparation cylinder 5 is as follows: It includes a cylinder seat 38 fixed on the main frame 1. A cylinder barrel 39 with a heat preservation interlayer is fitted in the middle of the cylinder seat 38. The bottom of the cylinder barrel 39 with a heat preservation interlayer is connected to the first high-temperature heat preservation wax conveying pipe 9 through a first inlet and outlet flange 41. The first high-temperature heat preservation wax conveying pipe 9 is respectively connected to the feed port flange 24 and the second high-temperature heat preservation wax conveying pipe 10. The second high-temperature heat preservation wax conveying pipe 10 is installed on the high-temperature wax liquid heat preservation barrel 14. A first piston 40 is installed in the cylinder barrel 39 with a heat preservation interlayer. The head of the first piston 40 is connected to a preparation electric cylinder 15. At the same time, the preparation electric cylinder 15 is vertically installed on the top of the cylinder seat 38. The telescopic rod of the preparation electric cylinder 15 is fixed to the first piston 40.

[0100] The structure of the wax injection cylinder 6 is as follows: It includes a cylinder frame platform 44. A horizontal movement system 46 is installed below the cylinder frame platform 44. A vertical lifting system 45 is installed below the horizontal movement system 46. Above the top plate of the cylinder frame platform 44, the end of the telescopic rod of the first wax injection electric cylinder 16, the end of the telescopic rod of the second wax injection electric cylinder 17, and the tail end of the second piston 48 are connected simultaneously by a wax injection transmission connecting plate 64. A secondary core telescopic system 49 and a tertiary core telescopic system 50 are installed above the cylinder frame platform 44.

[0101] The structure of the up-and-down lifting system 45 is as follows: It includes a first servo electric slide table 55, a second servo electric slide table 56, a third servo electric slide table 57, a fourth servo electric slide table 58 and a conversion frame 59. Symmetric first vertical plates 60 and second vertical plates 61 are arranged on the clamping die frame 2. The first servo electric slide table 55 and the second servo electric slide table 56 are installed on the first vertical plate 60, and the third servo electric slide table 57 and the fourth servo electric slide table 58 are installed on the second vertical plate 61. Both side faces of the conversion frame 59 are respectively connected to the sliders of the four servo electric slide tables;

[0102] The structure of the horizontal movement system 46 is as follows: It includes a fifth servo electric slide table 62 and a sixth servo electric slide table 63 installed on the top surface of the conversion frame 59. The bottom flat plate of the cylinder frame platform 44 is connected to the sliders of the fifth servo electric slide table 62 and the sixth servo electric slide table 63; The cylinder body 47 is vertically installed in the middle part under the top plate of the cylinder frame platform 44. The first wax injection electric cylinder 16 and the second wax injection electric cylinder 17 are vertically installed on both sides of the cylinder body 47 under the top plate of the cylinder frame platform 44. The second piston 48 is placed inside the cylinder body 47.

[0103] The structure of the secondary core telescopic system 49 is as follows: It includes a cylinder fixing frame 68 fixed on the bottom flat plate of the cylinder frame platform 44. The first secondary core cylinder 66 and the second secondary core cylinder 67 are installed on the cylinder fixing frame 68. The secondary core rod 65 is horizontally inserted into the cylinder body 47. The secondary core transmission connecting frame 69 connects the end parts of the expansion rods of the first secondary core cylinder 66 and the second secondary core cylinder 67 and the tail end of the secondary core rod 65; The first linear guide rail 70 and the second linear guide rail 71 are fixedly installed on the bottom flat plate of the cylinder frame platform 44. The first slider 72 and the second slider 73 are fitted with the first linear guide rail 70 and the second linear guide rail 71. The lower part of the secondary core transmission connecting frame 69 is connected to the first slider 72 and the second slider 73;

[0104] The structure of the tertiary core telescopic system 50 is as follows: It includes a tertiary core rod 74 and a tertiary core cylinder 75. The tertiary core cylinder 75 is installed on the secondary core transmission connecting frame 69. The end of the expansion rod of the tertiary core cylinder 75 is threadedly connected to the tail end of the tertiary core rod 74. The tertiary core rod 74 is horizontally inserted into the inside of the secondary core rod 65.

[0105] The low-temperature hot oil circulation system includes a hot oil tank 81, a first hot oil pump 82, an electric heater 83, a temperature control meter and oil pipes. The first hot oil pump 82 extracts the heat-conducting oil in the hot oil tank 81 and transports it to the heat-insulating interlayer and then returns to the hot oil tank 81. The electric heater 83 is controlled by the temperature control meter to heat, so that the temperature of the heat-conducting oil in the hot oil tank 81 is stabilized within the set range.

[0106] The high-temperature hot oil circulation system uses the second hot oil pump 84 to directly extract the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel 14 and transport it to each insulation interlayer and then back to the interlayer. The polyimide heating film 85 is attached to the outer surface of the high-temperature wax liquid insulation barrel 14, and the temperature control meter controls the polyimide heating film 85 to heat the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel 14, so that the temperature of the heat-conducting oil is stabilized within the set range.

[0107] The main frame 1 is of a frame structure.

[0108] The specific structure and functions of a special equipment for efficiently obtaining an isodensity model of a hot-melt material according to the present invention are as follows:

[0109] It mainly includes a main frame 1, a mold clamping frame 2, an outer shell sheet metal cover 3, a cooling and paste making unit 4, a stock preparation cylinder 5, a wax injection cylinder 6, a low-temperature hot oil circulation system, a high-temperature hot oil circulation system, a first high-temperature heat preservation wax conveying pipeline 9, a second high-temperature heat preservation wax conveying pipeline 10, a first low-temperature heat preservation wax conveying pipeline 11, a second low-temperature heat preservation wax conveying pipeline 12, a third low-temperature heat preservation wax conveying pipeline 13, a high-temperature wax liquid insulation barrel 14, a stock preparation electric cylinder 15, a first wax injection electric cylinder 16, a second wax injection electric cylinder 17, a mold clamping electric cylinder 18, an electric control system 19, etc.

[0110] Among them, the cooling and paste making unit 4 is composed of a hot air blower 20, a first surface cooler 21, a second surface cooler 22, a serpentine coil 23, a feed port flange 24, a first discharge port flange 25, a second discharge port flange 26, a first low-temperature heat preservation wax conveying pipeline 11, an air supply pipe 27, a return air pipe 28, a heat preservation box body 29, a circulating cooling water inlet electric valve 30, and a circulating cooling water outlet 31.

[0111] The hot air blower 20 is fixedly installed on the upper layer of the main frame 1, and the heat preservation box body 29 is fixedly installed on the lower layer of the main frame 1. The heat preservation box body 29 is divided into upper and lower parts, separated by a baffle 32 with a through hole in the middle. The lower part space is provided with multiple layers of serpentine coils 23. A flow limiting mandrel 33 is arranged in the straight pipeline of each serpentine coil 23 and is welded firmly to the pipe wall through a fixer. An air inlet 34 is provided on the side of the lower part and is connected to the first air outlet 35 of the hot air blower 20 through the air supply pipe 27; the first surface cooler 21 and the second surface cooler 22 are installed in the upper part space. The inlets of the two surface coolers are correspondingly attached to the through holes on the baffle 32. A second air outlet 36 is provided on the side of the upper part of the heat preservation box body 29 and is connected to the hot air blower return air port 37 through the return air pipe 28.

[0112] An electric valve 30 is provided at the circulating cooling water inlet.

[0113] The feed inlet flange 24 is arranged outside the heat preservation box body 29 and is connected to the inlet of the serpentine coil 23. The first low-temperature heat preservation wax conveying pipeline 11 is arranged in a tee shape outside the heat preservation box body 29. Among them, the first pipe orifice 1101 is connected to the outlet of the serpentine coil 23, the second pipe orifice 1102 is connected to the first discharge outlet flange 25, and the third pipe orifice 1103 is connected to the second discharge outlet flange 26. The second discharge outlet flange 26 is blocked by a flange blind plate 77 as a spare interface. The heat preservation interlayer of the first low-temperature heat preservation wax conveying pipeline 11 is connected to the low-temperature hot oil circulation system.

[0114] As Figure 4 shown, the material preparation cylinder 5 is composed of a cylinder base 38, a cylinder barrel 39 with a heat preservation interlayer, a first piston 40, a first inlet and outlet flange 41, a first high-temperature heat preservation wax conveying pipeline 9, a second high-temperature heat preservation wax conveying pipeline 10, a first pneumatic ball valve 42 with a heat preservation interlayer, a second pneumatic ball valve 43 with a heat preservation interlayer, and a material preparation electric cylinder 15.

[0115] The cylinder base 38 is fixedly installed on the upper layer of the main frame 1. The cylinder barrel 39 with a heat preservation interlayer is fixedly installed in the middle of the cylinder base 38. The first high-temperature heat preservation wax conveying pipeline 9 is in a tee shape. The bottom of the cylinder barrel 39 with a heat preservation interlayer is the first inlet and outlet flange 41, which is connected to the fourth pipe orifice 901 of the first high-temperature heat preservation wax conveying pipeline 9. One side flange of the first pneumatic ball valve 42 with a heat preservation interlayer is connected to the fifth pipe orifice 902 of the first high-temperature heat preservation wax conveying pipeline 9, and the other side flange is connected to the flange at one end of the second high-temperature heat preservation wax conveying pipeline 10 on the high-temperature wax liquid heat preservation barrel 14. The sixth pipe orifice 903 of the first high-temperature heat preservation wax conveying pipeline 9 is connected to one end flange of the second pneumatic ball valve 43 with a heat preservation interlayer. The other end flange of the second pneumatic ball valve 43 with a heat preservation interlayer is connected to the feed inlet flange 24 of the cooling paste making unit 4. The heat preservation interlayers of the cylinder barrel 39 with a heat preservation interlayer, the first pneumatic ball valve 42 with a heat preservation interlayer, the second pneumatic ball valve 43 with a heat preservation interlayer, the first high-temperature heat preservation wax conveying pipeline 9, and the second high-temperature heat preservation wax conveying pipeline 10 are connected to the high-temperature hot oil circulation system. The first piston 40 is placed in the cylinder barrel 39 with a heat preservation interlayer. The material preparation electric cylinder 15 is vertically installed on the top of the cylinder base 38, and the end of the telescopic rod is threadedly connected to the tail end of the first piston 40.

[0116] The wax injection cylinder 6 includes a cylinder frame platform 44, an up and down lifting system 45, a horizontal moving system 46, a cylinder body 47, a second piston 48, a secondary core telescopic system 49, a tertiary core telescopic system 50, a wax injection nozzle 51, a third pneumatic ball valve 52 with a heat preservation interlayer, a fourth pneumatic ball valve 53 with a heat preservation interlayer, a second low-temperature heat preservation wax conveying pipeline 12, a third low-temperature heat preservation wax conveying pipeline 13, a vortex flow rapid cooler 54, a first wax injection electric cylinder 16, a second wax injection electric cylinder 17, and a wax injection transmission connecting plate 64.

[0117] The up-and-down lifting system 45 consists of a first servo electric slide 55, a second servo electric slide 56, a third servo electric slide 57, a fourth servo electric slide 58, and a conversion frame 59. The first servo electric slide 55 and the second servo electric slide 56 are vertically installed on the first vertical plate 60 of the mold clamping frame 2, and the third servo electric slide 57 and the fourth servo electric slide 58 are vertically installed on the second vertical plate 61 of the mold clamping frame 2. Specific positions on both sides of the conversion frame 59 are respectively connected to the sliders of the four servo electric slides.

[0118] The horizontal movement system 46 consists of a fifth servo electric slide 62 and a sixth servo electric slide 63. The fifth servo electric slide 62 and the sixth servo electric slide 63 are horizontally installed at specific positions on the top flat plate of the conversion frame 59; specific positions under the bottom flat plate of the cylinder frame platform 44 are connected to the sliders of the fifth servo electric slide 62 and the sixth servo electric slide 63; the cylinder body 47 is vertically installed at the middle part under the top plate of the cylinder frame platform 44, and the first wax injection electric cylinder 16 and the second wax injection electric cylinder 17 are vertically installed on both sides of the cylinder body 47 under the top plate of the cylinder frame platform 44, and the second piston 48 is placed inside the cylinder body 47.

[0119] Above the top plate of the cylinder frame platform 44, a wax injection transmission connecting plate 64 is used to connect the end parts of the expansion rods of the first wax injection electric cylinder 16 and the second wax injection electric cylinder 17 and the tail end of the second piston 48.

[0120] The secondary core telescopic system 49 consists of a secondary core rod 65, a first secondary core cylinder 66, a second secondary core cylinder 67, a cylinder fixing frame 68, a secondary core transmission connecting frame 69, a first linear guide rail 70, a second linear guide rail 71, a first slider 72, and a second slider 73.

[0121] The cylinder fixing frame 68 is fixedly installed at a specific position on the top of the bottom flat plate of the cylinder frame platform 44. The first secondary core cylinder 66 and the second secondary core cylinder 67 are fixedly installed on the cylinder fixing frame 68. The secondary core rod 65 is horizontally inserted into a specific part of the cylinder body 47. The secondary core transmission connecting frame 69 is used to connect the end parts of the expansion rods of the first secondary core cylinder 66 and the second secondary core cylinder 67 and the tail end of the secondary core rod 65. The first linear guide rail 70 and the second linear guide rail 71 are fixedly installed at specific positions on the top of the bottom flat plate of the cylinder frame platform 44. The first slider 72 and the second slider 73 are fitted with the first linear guide rail 70 and the second linear guide rail 71, and a specific part of the lower part of the secondary core transmission connecting frame 69 is connected to the first slider 72 and the second slider 73.

[0122] The tertiary core telescopic system 50 consists of a tertiary core rod 74 and a tertiary core cylinder 75. The tertiary core cylinder 75 is installed at a specific position on the secondary core transmission connecting frame 69, and the end of its expansion rod is threadedly connected to the tail end of the tertiary core rod 74. The tertiary core rod 74 is horizontally inserted into a specific part of the secondary core rod 65.

[0123] The pneumatic ball valve 52 with a heat-insulating interlayer at No. 3 has one end, the first flange, connected to one end of the low-temperature heat-insulating wax conveying pipeline 12 at No. 2, and the other end, the second flange, of the pneumatic ball valve 52 with a heat-insulating interlayer at No. 3 is connected to one end of the low-temperature heat-insulating wax conveying pipeline 13 at No. 3. One end of the low-temperature heat-insulating wax conveying pipeline 12 at No. 2 is connected to the flange 76 of the second inlet / outlet at the lower part of the cylinder block 47, and the other end of the low-temperature heat-insulating wax conveying pipeline 13 at No. 3 is connected to the first discharge port flange 25 of the cooling and paste-making unit 4.

[0124] One end flange of the pneumatic ball valve 53 with a heat-insulating interlayer at No. 4 is connected to the outlet flange 78 on the side of the cylinder block 47, and the other end flange of the pneumatic ball valve 53 with a heat-insulating interlayer at No. 4 is connected to the flange 79 at the tail end of the wax injection nozzle 51. The flange 79 at the tail end of the wax injection nozzle 51 is installed at a specific position on the bottom flat plate of the cylinder frame platform 44;

[0125] The vortex flow rapid cooler 54 is installed at a specific position on the bottom flat plate of the cylinder frame platform 44, and its cold air outlet is connected to the cooling hood 80 through a pipeline. The cooling hood 80 is sleeved on the wax outlet part of the wax injection nozzle 51.

[0126] The heat-insulating interlayers of the cylinder block 47, the pneumatic ball valve 52 with a heat-insulating interlayer at No. 3, the pneumatic ball valve 53 with a heat-insulating interlayer at No. 4, the low-temperature heat-insulating wax conveying pipeline 12 at No. 2, and the low-temperature heat-insulating wax conveying pipeline 13 at No. 3 are connected to the low-temperature hot oil circulation system.

[0127] The low-temperature hot oil circulation system consists of a hot oil tank 81, a first hot oil pump 82, an electric heater 83, a temperature control meter and oil pipes, etc. The first hot oil pump 82 pumps the heat-conducting oil in the hot oil tank 81 to each heat-insulating interlayer and then returns to the hot oil tank 81. The electric heater 83 is controlled by the temperature control meter to heat, so that the temperature of the heat-conducting oil in the hot oil tank 81 is stabilized within the set range.

[0128] The high-temperature hot oil circulation system directly uses a second hot oil pump 84 to pump the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel 14 to each heat-insulating interlayer and then returns to the interlayer. A polyimide heating film 85 is attached to the outer surface of the high-temperature wax liquid insulation barrel 14. The temperature control meter controls the polyimide heating film 85 to heat the heat-conducting oil in the interlayer of the high-temperature wax liquid insulation barrel 14, so that the temperature of the heat-conducting oil is stabilized within the set range.

[0129] The stock preparation electric cylinder 15, the first wax injection electric cylinder 16, the second wax injection electric cylinder 17, and the mold clamping electric cylinder 18 are all driven by high-precision servo.

[0130] The electric control system 19 includes a control system and electrical control execution devices, and is installed in the sheet metal structure control cabinet.

[0131] In the actual operation process, it is completed through the following steps:

[0132] S1: Turn on the low-temperature hot oil circulation system to make the temperature reach the set value T1;

[0133] S2: Turn on the high-temperature hot oil circulation system to make the temperature reach the set value T2;

[0134] S3: Start the hot air blower 20 and set the temperature T3 = T1 + 2;

[0135] S4: Start the intelligent control unit to moderately turn on the cooling water circulation in the surface cooler for cooling until the temperature of the melt in the multi-layer serpentine coil 23 and the hot air temperature reach equilibrium, and then completely turn off the cooling water circulation in the surface cooler;

[0136] S5: Draw materials from the material preparation cylinder 5: Open the pneumatic ball valve 42 with a heat-insulating interlayer and close the pneumatic ball valve 43 with a heat-insulating interlayer. The inner cavity of the cylinder barrel 39 with a heat-insulating interlayer is only connected to the inner cavity of the high-temperature wax liquid heat preservation barrel 14. Start the position drive control mode of the material preparation electric cylinder 15, set the output force F1, drive the first piston 40 to move upward by a distance L1. The diameter of the first piston 40 of the cylinder barrel 39 with a heat-insulating interlayer is D1.

[0137] Extract the high-temperature wax liquid volume V1 = L1πD1 2 / 4 for standby;

[0138] S6: Discharge materials from the material preparation cylinder 5: Close the pneumatic ball valve 42 with a heat-insulating interlayer and open the pneumatic ball valve 43 with a heat-insulating interlayer. The inner cavity of the cylinder barrel 39 with a heat-insulating interlayer is only connected to the feed port of the serpentine coil 23 of the cooling paste-making unit 4. Start the torque drive control mode of the material preparation electric cylinder 15, set the torque T a , drive the first piston 40 to move downward by a distance L1. The diameter of the first piston 40 of the cylinder barrel 39 with a heat-insulating interlayer is D1, and extrude the high-temperature wax liquid volume V1 = L1πD1 2 / 4 into the cooling paste-making unit 4;

[0139] S7: Repeat S5 and S6 until the cylinder barrel 39 with a heat-insulating interlayer, the serpentine coil 23, and the three low-temperature heat preservation wax conveying pipes are filled with the melt;

[0140] S8: At this time, the pneumatic ball valve 42 with a heat-insulating interlayer is in the closed state, the pneumatic ball valve 43 with a heat-insulating interlayer is in the open state, the pneumatic ball valve 52 with a heat-insulating interlayer is in the open state, and the pneumatic ball valve 53 with a heat-insulating interlayer is in the closed state;

[0141] S9: Start the torque drive control mode of the mold clamping electric cylinder 18, set the torque T b , drive the moving template to move downward until the mold is locked;

[0142] S10: Start the up and down lifting system 45, adjust the position of the wax injection nozzle 51 so that it is aligned with the wax injection port of the mold;

[0143] S11: Start the horizontal movement system 46, servo slide torque drive control mode, set the torque Tc, move the wax injection nozzle 51 to the mold wax injection port and make hard contact, stop when the detected torque reaches Tc;

[0144] S12: Start the position drive control mode of the first wax injection electric cylinder 16 and the second wax injection electric cylinder 17, set the output force F2, according to the volume V of the mold cavity in this time m Set the upward movement distance L2 of the second piston 48 of the cylinder block 47, the diameter D2 of the second piston 48 of the cylinder block 47, the volume V2 = L2πD2 2 / 4, V2 = V m *K - Ve, where K is the compression coefficient, V e is the compensation volume of the secondary core and the four - way pneumatic ball valve 53 with heat - preservation interlayer.

[0145] S13: When the second piston 48 starts to move upward, it causes changes in the overall volume of the stock preparation cylinder 5, pipeline, and wax injection cylinder 6. The torque drive control mode of the stock preparation electric cylinder 15 drives the first piston 40 of the stock preparation cylinder 5 to move downward to compress the stock preparation cylinder 5 when detecting a decrease in torque, and squeeze high - temperature wax liquid into the cooling paste - making unit 4. At the same time, the paste - like or paste - like hot melt in the cooling paste - making unit 4 is extruded into the cylinder block 47 until the second piston 48 stops at the set L2. The torque drive control mode of the stock preparation electric cylinder 15 stops when detecting that the torque reaches Ta, and then closes the three - way pneumatic ball valve 52 with heat - preservation interlayer. At this time, the hot melt with volume V2 and temperature T1 is prepared in the cylinder block 47 according to the setting.

[0146] S14: Open the four - way pneumatic ball valve 53 with heat - preservation interlayer. At this time, there is only a channel between the inner cavity of the cylinder block 47 and the wax injection nozzle 51.

[0147] S15: Start the torque drive control mode of the first wax injection electric cylinder 16 and the second wax injection electric cylinder 17, set the torque Td, drive the second piston 48 to move downward by a distance L2. Stop only when detecting that the torque reaches Td, that is, when the second piston 48 makes hard contact with the bottom of the inner cavity of the cylinder block 47, to ensure that all the hot melt with volume V2 and temperature T1 prepared is extruded from the inner cavity of the cylinder block 47. At this time, most of the hot melt is injected into the mold cavity, and a small amount remains in the internal injection pipe structure of the cylinder block 47 and the wax injection nozzle 51;

[0148] S16: Start the secondary core telescopic system 49 and the tertiary core telescopic system 50. The secondary core rod 65 extends into the internal injection pipe structure of the cylinder block 47 to squeeze the remaining hot melt into the mold cavity, and the tertiary core rod 74 extends into the wax injection nozzle 51 to squeeze the remaining hot melt into the mold cavity.

[0149] S17: After the secondary core and the tertiary core are fully extended, turn on the vortex flow rate cooler 54 to introduce compressed air. The cold air enters the cooling cover 80 and quickly cools the molten wax at the contact point between the injection nozzle 51 and the mold cavity inlet into solid wax, which seals the mold cavity and prevents the internal molten wax from overflowing and flowing away, reducing the density of the model.

[0150] S18: Maintain this state for a time T;

[0151] S19: Turn off the vortex flow rate cooler 54;

[0152] S20: Withdraw the tertiary core;

[0153] S21: Withdraw the secondary core;

[0154] S22: Close the pneumatic ball valve 53 with a heat-insulating interlayer of No. 4;

[0155] S23: Start the horizontal movement system 46 to withdraw the injection nozzle 51;

[0156] S24: Start the clamping electric cylinder 18 to move the upper moving platen to release the clamping and open the mold to take out the model;

[0157] If the required V2 calculated according to the volume Vm of the mold cavity is much larger than the volume Vs of the cylinder body 47 of the injection wax cylinder 6,

[0158] After the 14 is replaced and the second piston 48 moves up to the maximum distance Ls, the stock preparation electric cylinder 15 immediately switches to the position drive control mode, opens the pneumatic ball valve 53 with a heat-insulating interlayer of No. 4, and the first piston 40 moves down a distance L3 = (V2 - Vs) / (πD1 2 / 4), and injects the molten wax with the volume difference directly into the mold cavity through the internal injection pipe structure of the cylinder body 47; then execute S15.

[0159] The present invention utilizes the electric control characteristics of the servo electric cylinder to achieve precise control of the position, torque, and speed of the injection wax cylinder 6.

[0160] The present invention injects a set amount of molten wax into the mold cavity with a fixed volume to ensure obtaining a model with equal density, stable shrinkage rate of the product, and high consistency of product quality.

[0161] The present invention combines hot air and a surface cooler with intelligent temperature control to forcibly cool and efficiently produce high-quality paste-like or ointment-like molten wax.

[0162] The present invention adopts a secondary core and a tertiary core structure to discharge the residual molten wax in the pipeline, ensuring that the set amount of molten wax is thoroughly executed.

[0163] A flow-limiting mandrel 33 is arranged in the wax conveying pipeline to occupy the space in the pipeline, so that the molten wax in the pipeline moves along the annular pipe space with a certain thickness formed between the mandrel and the inner wall of the pipeline after being extruded, ensuring that the thinner molten wax fully exchanges heat with the outside of the pipeline.

[0164] The present invention separately provides a low-temperature and low-heat oil circulation system and a high-temperature oil circulation system to meet different heat preservation requirements and precisely control the temperature of the hot melt body.

[0165] The high-temperature oil circulation system of the present invention directly uses the heat-conducting oil in the interlayer of the high-temperature wax liquid heat preservation barrel 14 for circulation, and the polyimide heating film 85 is attached to the outer surface of the high-temperature wax liquid heat preservation barrel 14, with uniform heat reception over a large area. There is no need to separately provide a heater in other parts, and the heat of the high-temperature wax liquid itself is fully utilized, reducing power consumption.

[0166] The present invention reduces oil leakage, maintenance work such as replacing aging sealing rings, and non-functional power consumption such as the long-term operation and standby of the hydraulic motor and the additional heat dissipation of the circulating cooling water due to the absence of a hydraulic system.

[0167] The above description is an explanation of the present invention, not a limitation thereof. For the scope defined by the present invention, refer to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A special device for an isodensity model capable of efficiently obtaining a hot-melt material, characterized in that: It includes a main frame (1), an outer shell sheet metal (3) is arranged outside the main frame (1), and a mold clamping frame (2) is fixedly installed on the top surface of the main frame (1); a cooling and paste making unit (4) is arranged inside the main frame (1), and the cooling and paste making unit (4) is connected to a feeding cylinder (5) and a high-temperature wax liquid heat preservation barrel (14); a wax injection cylinder (6), a low-temperature hot oil circulation system, a high-temperature hot oil circulation system and an electric control system (19) are arranged inside the mold clamping frame (2).

2. The special equipment for the isodensity model of a hot-melt material capable of efficiently obtaining the same, as described in claim 1, is characterized in that: The structure of the cooling and paste making unit (4) is as follows: it includes a hot air blower (20) fixedly installed at the upper layer position of the main frame (1), and a heat preservation box body (29) fixedly installed at the lower layer position of the main frame (1). The heat preservation box body (29) is divided into upper and lower parts by a baffle plate (32) with through holes. A multi-layer serpentine coil pipe (23) is arranged in the lower space. At the same time, an air inlet (34) is arranged on the side of the lower space. The air inlet (34) is connected to the first air outlet (35) of the hot air blower (20) through an air supply pipe (27); a first surface cooler (21) and a second surface cooler (22) are installed at intervals in the upper space. The inlets of the first surface cooler (21) and the second surface cooler (22) are correspondingly attached to the through holes on the baffle plate (32). At the same time, a second air outlet (36) is arranged on the side of the upper space. The second air outlet (36) is connected to the hot air blower return air port (37) through a return air pipe (28); a feed port flange (24) is arranged outside the heat preservation box body (29) and is connected to the inlet of the serpentine coil pipe (23). The first low-temperature heat preservation wax conveying pipe (11) is also in a tee shape and is arranged outside the heat preservation box body (29). The first low-temperature heat preservation wax conveying pipe (11) is respectively connected to the outlet of the serpentine coil pipe (23), a first discharge port flange (25) and a second discharge port flange (26). The heat preservation interlayer of the first low-temperature heat preservation wax conveying pipe (11) is communicated with the low-temperature hot oil circulation system.

3. The special equipment for an isodensity model of a hot-melt material capable of efficiently obtaining the hot-melt material as claimed in claim 2, characterized in that: A flow limiting mandrel (33) is arranged in the straight pipe of the serpentine coil pipe (23), and the flow limiting mandrel (33) is welded to the inner wall surface of the serpentine coil pipe (23) through a fixator.

4. The special equipment for an isodensity model of a hot-melt material capable of efficiently obtaining the same, as described in claim 2, is characterized in that: The structure of the feeding cylinder (5) is as follows: it includes a cylinder seat (38) fixed on the main frame (1). A cylinder barrel (39) with a heat preservation interlayer is fitted in the middle of the cylinder seat (38). The bottom of the cylinder barrel (39) with a heat preservation interlayer is connected to a first high-temperature heat preservation wax conveying pipe (9) through a first inlet and outlet flange (41). The first high-temperature heat preservation wax conveying pipe (9) is respectively connected to the feed port flange (24) and a second high-temperature heat preservation wax conveying pipe (10). The second high-temperature heat preservation wax conveying pipe (10) is installed on the high-temperature wax liquid heat preservation barrel (14); a first piston (40) is installed in the cylinder barrel (39) with a heat preservation interlayer. The head of the first piston (40) is connected to a feeding electric cylinder (15). At the same time, the feeding electric cylinder (15) is vertically installed on the top of the cylinder seat (38), and the telescopic rod of the feeding electric cylinder (15) is fixed to the first piston (40).

5. The special equipment for an isodensity model capable of efficiently obtaining a hot-melt material as claimed in claim 1, characterized in that: The structure of the wax injection cylinder (6) is as follows: It includes a cylinder frame platform (44). A horizontal movement system (46) is installed below the cylinder frame platform (44), and a vertical lifting system (45) is installed below the horizontal movement system (46). Above the top plate of the cylinder frame platform (44), the end of the telescopic rod of the first wax injection electric cylinder (16) and the second wax injection electric cylinder (17) and the tail end of the second piston (48) are simultaneously connected by a wax injection transmission connection plate (64); Above the cylinder frame platform (44), a secondary core telescopic system (49) and a tertiary core telescopic system (50) are installed. The structure of the vertical lifting system (45) is as follows: It includes a first servo electric slide (55), a second servo electric slide (56), a third servo electric slide (57), a fourth servo electric slide (58) and a conversion frame (59). Symmetric first vertical plates (60) and second vertical plates (61) are arranged on the mold clamping frame (2). The first servo electric slide (55) and the second servo electric slide (56) are installed on the first vertical plate (60), and the third servo electric slide (57) and the fourth servo electric slide (58) are installed on the second vertical plate (61). The two side surfaces of the conversion frame (59) are respectively connected to the sliders of the four servo electric slides. The structure of the horizontal movement system (46) is as follows: It includes a fifth servo electric slide (62) and a sixth servo electric slide (63) installed on the top surface of the conversion frame (59). The bottom flat plate of the cylinder frame platform (44) is connected to the sliders of the fifth servo electric slide (62) and the sixth servo electric slide (63); The cylinder body (47) is vertically installed in the middle part below the top plate of the cylinder frame platform (44). The first wax injection electric cylinder (16) and the second wax injection electric cylinder (17) are vertically installed on both sides of the cylinder body (47) below the top plate of the cylinder frame platform (44), and the second piston (48) is placed in the cylinder body (47).

6. The special equipment for the isodensity model of a hot-melt material capable of efficiently obtaining the same, characterized in that: The structure of the secondary core telescopic system (49) is as follows: It includes a cylinder fixing frame (68) fixed on the bottom flat plate of the cylinder frame platform (44). The first secondary core cylinder (66) and the second secondary core cylinder (67) are installed on the cylinder fixing frame (68). The secondary core rod (65) is horizontally inserted into the cylinder body (47). The end of the telescopic rod of the first secondary core cylinder (66) and the second secondary core cylinder (67) and the tail end of the secondary core rod (65) are connected by a secondary core transmission connection frame (69); The first linear guide (70) and the second linear guide (71) are fixedly installed on the bottom flat plate of the cylinder frame platform (44). The first slider (72) and the second slider (73) are fitted with the first linear guide (70) and the second linear guide (71), and the lower part of the secondary core transmission connection frame (69) is connected to the first slider (72) and the second slider (73). The structure of the tertiary core telescopic system (50) is as follows: It includes a tertiary core rod (74) and a tertiary core cylinder (75). The tertiary core cylinder (75) is installed on the secondary core transmission connection frame (69). The end of the telescopic rod of the tertiary core cylinder (75) is threadedly connected to the tail end of the tertiary core rod (74), and the tertiary core rod (74) is horizontally inserted into the secondary core rod (65).

7. The special equipment for the isodensity model of a hot-melt material capable of efficiently obtaining the same, as described in claim 1, is characterized in that: The low-temperature hot oil circulation system includes a hot oil tank (81), a first hot oil pump (82), an electric heater (83), a temperature control meter and oil pipes. The first hot oil pump (82) extracts the heat-conducting oil in the hot oil tank (81) and transports it to the heat-insulating interlayer and then back to the hot oil tank (81). The electric heater (83) is controlled by the temperature control meter to heat, so that the temperature of the heat-conducting oil in the hot oil tank (81) is stabilized within the set range.

8. The special equipment for the isodensity model of a hot-melt material capable of efficiently obtaining the same, characterized in that: The high-temperature hot oil circulation system uses a second hot oil pump (84) to directly extract the heat-conducting oil in the interlayer of the high-temperature wax liquid heat preservation barrel (14) and transport it to each heat-insulating interlayer and then back to the interlayer. A polyimide heating film (85) is attached to the outer surface of the high-temperature wax liquid heat preservation barrel (14). The temperature control meter controls the polyimide heating film (85) to heat the heat-conducting oil in the interlayer of the high-temperature wax liquid heat preservation barrel (14), so that the temperature of the heat-conducting oil is stabilized within the set range.

9. The special equipment for the isodensity model of a hot-melt material capable of efficiently obtaining the same, as described in claim 1, is characterized in that: The main frame (1) is of a frame structure.

10. A method for efficiently obtaining an isodensity model of a hot-melt material, characterized in that: It includes the following operation processes: S1. Turn on the low-temperature hot oil circulation system to make the temperature reach the set value T1; S2. Turn on the high-temperature hot oil circulation system to make the temperature reach the set value T2; S3. Start the hot air blower (20) and set the temperature T3 = T1 + 2; S4. Start the intelligent control unit to moderately turn on the cooling water circulation in the surface cooler to cool down until the temperature of the melt in the multi-layer serpentine coil (23) reaches equilibrium with the hot air temperature, and then completely turn off the cooling water circulation in the surface cooler; S5. The feeding cylinder (5) sucks materials: Open the pneumatic ball valve with heat-insulating layer (42) No. 1, close the pneumatic ball valve with heat-insulating layer (43) No.

2. The inner cavity of the cylinder barrel with heat-insulating layer (39) is only connected to the inner cavity of the high-temperature wax liquid heat-insulating barrel (14). Start the position drive control mode of the stock preparation electric cylinder (15), set the output force F1, drive the No. 1 piston (40) to move upward by a distance L1. The diameter of the No. 1 piston (40) of the cylinder barrel with heat-insulating layer (39) is D1. The volume of the high-temperature wax liquid extracted is V1 = L1πD1 / 4 for standby; 2 / 4 standby; S6. The feeding cylinder (5) discharges materials: Close the pneumatic ball valve with heat-insulating interlayer (42) of No. 1 and open the pneumatic ball valve with heat-insulating interlayer (43) of No.

2. The inner cavity of the cylinder barrel with heat-insulating interlayer (39) is only connected to the feed port of the serpentine coil (23) of the cooling paste-making unit (4). Start the torque drive control mode of the stock preparation electric cylinder (15) and set the torque T a , drive the No. 1 piston (40) to move downward by a distance L1. The diameter of the No. 1 piston (40) of the cylinder barrel with heat-insulating interlayer (39) is D1. The volume of the high-temperature wax liquid extruded is V1 = L1πD1 2 / 4 enters the cooling paste-making unit (4); S7: Repeat S5 and S6 until the cylinder barrel with a heat-insulating interlayer (39), the serpentine coil (23) and the three low-temperature heat-preserving wax conveying pipes are filled with the melt; S8: At this time, the first pneumatic ball valve with a heat-insulating interlayer (42) is in the closed state, the second pneumatic ball valve with a heat-insulating interlayer (43) is in the open state, the third pneumatic ball valve with a heat-insulating interlayer (52) is in the open state, and the fourth pneumatic ball valve with a heat-insulating interlayer (53) is in the closed state; S9: Activate the torque drive control mode of the clamping electric cylinder (18), and set the torque T b , and drive the moving platen to move downward until the mold is locked; S10. Start the up and down lifting system (45) to adjust the position of the wax injection nozzle (51) so that it is aligned with the wax injection port of the mold; S11. Start the horizontal moving system (46), the servo slide torque drive control mode, set the torque Tc, so that the wax injection nozzle (51) moves to the wax injection port of the mold and makes hard contact, and stop when the detected torque reaches Tc; S12: Activate the position drive control mode of the first wax injection electric cylinder (16) and the second wax injection electric cylinder (17), set the output force F2, and based on the volume V of the mold cavity in this time m Set the distance L2 for the second piston (48) to move upward, the diameter D2 of the second piston (48) of the cylinder block (47), and the volume V2 = L2πD2 2 / 4, V2 = V m *K - Ve, where K is the compression coefficient, and V e is the compensation volume between the secondary core and the pneumatic ball valve (53) with a four - layer heat - insulating sandwich S13. When the second piston (48) starts to move upward, it causes a change in the overall volume of the feeding cylinder (5), the pipeline and the wax injection cylinder (6). The torque drive control mode of the feeding electric cylinder (15) detects that the torque becomes smaller and then drives the first piston (40) of the feeding cylinder (5) to move downward to compress the feeding cylinder (5), and squeeze the high-temperature wax liquid into the cooling paste-making unit (4). At the same time, the paste-like or pasty melt in the cooling paste-making unit (4) is extruded into the cylinder body (47) until the second piston (48) stops at the set L2. The torque drive control mode of the feeding electric cylinder (15) detects that the torque reaches Ta and then stops. Then close the third pneumatic ball valve with a heat-insulating interlayer (52). At this time, the cylinder body (47) is filled with the melt at temperature T1 with a set volume of V2; S14. Open the fourth pneumatic ball valve with a heat-insulating interlayer (53). At this time, there is only a channel between the inner cavity of the cylinder body (47) and the wax injection nozzle (51); S15: Activate the torque drive control mode of the first wax injection electric cylinder (16) and the second wax injection electric cylinder (17), set the torque Td, and drive the second piston (48) to move downward by a distance L2. Stop only when the detected torque reaches Td, that is, when the second piston (48) makes hard contact with the bottom of the inner cavity of the cylinder block (47), to ensure that all the hot melt with a volume of V2 and a temperature of T1 is completely extruded from the inner cavity of the cylinder block (47). At this time, most of the hot melt is injected into the mold cavity, and a small amount remains in the internal injection pipe structure of the cylinder block (47) and the wax injection nozzle (51); S16: Activate the secondary core telescopic system (49) and the tertiary core telescopic system (50). The secondary core rod (65) extends into the internal injection pipe structure of the cylinder block (47) to squeeze the remaining hot melt into the mold cavity, and the tertiary core rod (74) extends into the wax injection nozzle (51) to squeeze the remaining hot melt into the mold cavity; S17: After the secondary core and the tertiary core extend in place, turn on the vortex flow rapid cooler (54) to introduce compressed air. The cold air enters the cooling cover (80) to quickly cool the hot melt wax at the contact point between the wax injection nozzle (51) and the entrance of the mold cavity into solid wax, which plays a role in sealing the mold cavity and preventing the internal hot melt wax from overflowing and flowing away, reducing the density of the model; S18: Maintain this state for a time T; S19: Turn off the vortex flow rapid cooler (54); S20: Withdraw the tertiary core; S21: Withdraw the secondary core; S22: Close the pneumatic ball valve with heat insulation layer No. 4 (53); S23: Activate the horizontal movement system (46) to withdraw the wax injection nozzle (51); S24: Activate the clamping electric cylinder (18) to move the upper moving template to release the clamping and open the mold to take out the model.

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