CN111906970A

CN111906970A - Labyrinth type runner irrigator rapid die and processing method thereof

Info

Publication number: CN111906970A
Application number: CN202010555021.5A
Authority: CN
Inventors: 魏正英; 陈卓; 陈雪丽; 贾维兵
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2020-11-10

Abstract

The invention relates to a processing method of a quick mould of a labyrinth-type runner irrigator, which comprises the following steps of 1, printing a quick mould base of the labyrinth-type runner irrigator by adopting a digital abs resin material through a polymer injection technology; and 2, plating metal chromium on the die cavity and the core of the rapid die matrix and the surface of the parting surface of the rapid die matrix by adopting an evaporation coating technology to form a chromium coating. A labyrinth runner irrigator rapid mould, an upper mould comprises a cavity, a sprue, an upper mould runner, a sprue bush mounting hole and a chromium coating; the lower die comprises a core, a cold material well and a top rod hole; the core comprises a labyrinth runner and a grid; the lower die and the upper die are closed to form a labyrinth runner irrigator die cavity; two labyrinth type runner irrigator mold cavities are symmetrically arranged in the mold by taking the main runner as the center; the whole core adopts an insert structure; and chromium coatings are arranged on the contact surfaces of the cavity and the core and the parting surface of the mold. The die can be quickly and conveniently manufactured, and the production cost is reduced.

Description

Labyrinth type runner irrigator rapid die and processing method thereof

Technical Field

The invention relates to additive manufacturing and physical coating technologies, in particular to a quick labyrinth runner irrigator mold and a processing method thereof.

Background

In the development process of the emitter, it is important to shorten the time from the simulation experiment to the actual experiment. A mold is required in the conventional development process. The die is a general term for various models which are processed into required shapes and sizes from metals or non-metals under certain process conditions. The manufacturing technology of the mold plays a very important role in the manufacturing process of most modern products, and in the modern industrial production, 60 to 90 percent of industrial products need to be processed by the mold, which is called as an industrial mother. In the actual production, the die has important significance, has the greatest advantages of improving the production rate, being extremely beneficial to the quick updating of products, and simultaneously has the characteristics of reducing the energy consumption and the cost, saving raw materials, keeping high consistency of the products and the like. But mold fabrication also has certain limitations. The technical difficulty of mold development is high, and the difficulty of mold manufacture depends on the appearance of a part, so that the more complicated the structure of the part is, the more the part with higher molding quality requirement is, the more difficult the mold manufacture is. In addition, in order to reduce the production cost, to obtain a large profit in the market competition, to gain the market competition, the machining of the mold must guarantee a certain amount of production. For the traditional steel mould, the design period is long, the price of the mould steel is expensive, a large amount of time and money are consumed from the transportation of the mould material to the processing of the mould, and meanwhile, if the parts are too complex, the mould opening cost is further increased, so that the mould is not suitable for the design and manufacture of small-batch and personalized products. The research and development of new products, including the design of personalized products, become more and more important in the current society, so that the mold industry is increasingly competitive, and the requirement that the mold can be manufactured quickly and at low cost is required so as to meet the social requirements. The Rapid Tooling (Rapid Tooling) technology is a new mold manufacturing method derived on the basis of the Rapid molding technology and the traditional molding technology, provides a new way with rapidness and low cost for the development, trial production and small-batch production of new molds, improves the production efficiency and shortens the development period.

Chinese patent CN201821981097.9 discloses a special fast mold device for injection molding, which is complicated in structure and not beneficial to low-cost mass production.

Chinese patent CN201710961771.0 discloses a metal arc spraying die process, but this process is only suitable for metal dies, and is not suitable for fast dies.

Chinese patent CN201710936632.2 discloses a method for rapid mold injection molding of metal parts, but this method is suitable for metal powder additive manufacturing, and the processing flow is complicated, which is not favorable for shortening the mold processing cycle.

Chinese patent CN201610398390.1 discloses a method for manufacturing a hard rapid die, which is not high in precision, and the hard rapid die needs to be mounted on incremental forming equipment or numerical control machining equipment, and the shape of the part is precisely processed in numerical control according to the final size requirement of the part, so as to obtain the final size part. This method is time and labor consuming and is not conducive to rapid production.

Chinese patent CN201510456490.0 discloses a method for investment casting rapid prototyping, but the wax pattern is only suitable for metal casting prototyping and cannot be applied to injection mold. The defects of long processing period, high processing cost and the like exist when the traditional mould is applied to the small-batch production of the labyrinth runner irrigator.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a quick mould for a labyrinth runner irrigator and a processing method thereof, which can quickly and conveniently manufacture the mould, shorten the manufacturing period of the mould, reduce the production cost and realize low-cost short-period small-batch production.

The invention is realized by the following technical scheme:

a method for processing a labyrinth type runner irrigator rapid mould, which comprises the following steps,

step 1, printing a quick mould matrix of the labyrinth-type runner irrigator by adopting a digital abs resin material through a polymer injection technology;

and 2, plating metal chromium on the die cavity and the core of the rapid die matrix and the surface of the parting surface of the rapid die matrix by adopting an evaporation coating technology to form a chromium coating.

Preferably, in step 1, during the process of printing the cavities and cores inside the rapid die base, ultraviolet light is used for carrying out surface roughness treatment on the cavities and cores.

Preferably, in step 1, a polymer injection technology is adopted to inject a digital abs resin material into a printing and forming area of a mold through a micro-nozzle of a printing device to form a resin layer, meanwhile, ultraviolet rays are adopted to cure the resin layer, and after deposition, the digital abs resin layer is repeatedly added and cured by adjusting the thickness of the resin layer to form the rapid matrix of the labyrinth-type runner irrigator.

A quick mould of a labyrinth type runner irrigator comprises an upper mould and a lower mould;

the upper die comprises a cavity, a pouring gate, an upper die runner, a pouring gate sleeve mounting hole and a chromium coating;

the lower die comprises a core, a cold material well and a top rod hole; the core comprises a labyrinth runner and a grid;

a main runner is arranged in the center of the upper die, a sprue bush mounting hole is formed in the inlet of the main runner, an outlet of the main runner is communicated with an upper die sub-runner, and a sprue is arranged at the tail end of the upper die sub-runner and communicated with the die cavity;

the lower die is provided with a cold material well corresponding to the main runner position of the upper die, a lower die sub-runner corresponding to the sub-runner position of the upper die, the cold material well is communicated with the lower die sub-runner, a core is arranged on the lower die corresponding to the cavity position of the upper die, the labyrinth runner is arranged on the parting surface of the lower die, a grid is arranged on the labyrinth runner, and the ejector rod hole is arranged at the bottom of the labyrinth runner and penetrates through the whole lower die;

the lower die and the upper die are combined to form a labyrinth type runner irrigator die cavity; two labyrinth type runner irrigator mold cavities are symmetrically arranged in the mold by taking the main runner as the center;

the whole core adopts an insert structure;

and chromium coatings are arranged on the contact surfaces of the cavity and the core and the parting surface of the mold.

Preferably, the horizontal cross sections of the upper die runner and the lower die runner are circular arc-shaped, and the vertical cross section of the runner formed after the lower die and the upper die are closed is circular.

Further, the runner is the cuboid structure, and the height of runner equals with last mould subchannel's radius, the last plane and the mould die joint parallel and level of runner.

Preferably, the thickness of the chromium plating layer is 10-20 μm.

Preferably, the ejector rod holes are divided into a first ejector rod hole and a second ejector rod hole, the first ejector rod hole is symmetrically arranged at the end parts of the two labyrinth-type runner irrigator mold cavities by taking the main runner as a center, and the second ejector rod hole is symmetrically arranged at the bottom of the labyrinth runner by taking the main runner as a center; the radius of the first ejector rod hole is larger than that of the second ejector rod hole.

Preferably, four apex angles of going up the mould die joint all set up the pit, four apex angles of lower mould die joint all set up the boss, and the pit cooperates with the boss is pegged graft.

Furthermore, the concave pits and the convex platforms are provided with draft angles of 5-15 degrees.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides a labyrinth runner irrigator rapid mould processing method, which adopts a digital abs resin material printing mould through a polymer injection technology, can improve the development speed of products and the flexibility degree of production, quickly and conveniently manufacture the mould, shorten the mould manufacturing period, reduce the production cost, have good economic benefits, avoid the defects of high processing cost and long processing time of the traditional mould manufacturing method, plate a chromium coating on the surface of the formed mould to increase the strength of a mould parting surface, solve the defect that the resin mould is not wear-resistant, prolong the service life of the rapid mould, enhance the heat dissipation of the mould by the chromium coating, make up the defects of poor temperature resistance and low utilization times of the digital abs resin material, improve the reutilization property of the digital abs material mould, and reduce the production cost.

Further, in the step 1, in the process of printing the inner cavity and the core of the mold, ultraviolet light is adopted to perform surface roughness treatment on the cavity and the core simultaneously. The roughness of the surface of the die is reduced, so that the surface of the die is easy to be tightly combined with the chromium coating.

According to the quick labyrinth-runner irrigator mold, the one-mold two-cavity structure is arranged, so that the balance in the injection molding process is ensured, and the labyrinth-runner irrigator is easy to form. The mold core adopts an insert structure, so that the difficulty in mold processing is reduced, the molding and demolding in the processing process are facilitated, a modular structure is formed, the exchange of vulnerable parts is facilitated, and the service life is prolonged; gaps existing at the periphery of the insert are beneficial to the discharge of gas during the forming of the labyrinth runner irrigator, and the phenomenon that the labyrinth runner irrigator is stuck to a mold to cause difficult demolding can be avoided. Meanwhile, the strength of the die can be improved, the material can be saved, and the cost can be reduced. The use of inserts in small volume production can reduce the amount of printing required for mold fabrication and increase stability against heat and mechanical loads during injection molding.

Further, the ejector rod holes are divided into a first ejector rod hole and a second ejector rod hole, the first ejector rod hole is symmetrically arranged at the end parts of the two labyrinth-type runner irrigator mold cavities by taking the main runner as a center, and the second ejector rod hole is symmetrically arranged at the bottom of the labyrinth runner by taking the main runner as a center; the radius of the first ejector rod hole is larger than that of the second ejector rod hole. The ejector rod hole I plays a main role in the ejection process of the plastic part, the ejector rod hole II plays an auxiliary role in ejection, and the smooth operation of the demolding process is ensured under the synergistic effect.

Further, four apex angle departments of going up the mould die joint all set up the pit, and four apex angle departments of lower mould die joint all set up the boss, and the pit cooperates with the boss is pegged graft. The four top corners of the upper die and the lower die are provided with the pits and the bosses for positioning, so that the upper die and the lower die are not staggered in the die assembly and injection molding process.

Furthermore, the concave pits and the convex platforms are provided with draft angles of 5-15 degrees. The die drawing angle is arranged, so that smooth demolding is facilitated in the die separating process.

Drawings

FIG. 1 is a top view of the upper mold structure of the quick labyrinth-type flow passage emitter mold of the present invention;

FIG. 2 is a side view of the upper mold structure of the labyrinth-type runner irrigator rapid mold of the invention;

FIG. 3 is a three-dimensional structure diagram of an upper die of the quick labyrinth-type runner irrigator of the invention;

FIG. 4 is a top view of the lower mold structure of the quick labyrinth-type runner irrigator of the invention;

FIG. 5 is a side view of the lower mold structure of the quick labyrinth-type runner irrigator of the invention;

FIG. 6 is a lower mold three-dimensional structure diagram of the labyrinth type runner irrigator rapid mold of the invention;

FIG. 7 is a bottom perspective view of the lower mold of the rapid mold of the labyrinth-type flow path emitter of the present invention;

FIG. 8 is a schematic view of the labyrinth-type flow path emitter core configuration of the present invention;

FIG. 9 is a three-dimensional topographical view of the surface coating layer of the present invention;

FIG. 10 is a drawing of an injection molded product of the present invention;

in the figure: the structure comprises a cavity 1, a sprue 2, an upper die runner 31, a lower die runner 32, a sprue bush mounting hole 4, a parting surface 5, a pit 6, a labyrinth runner 7, a cold material well 8, a grid 9, a first ejector rod hole 10, a boss 11 and a second ejector rod hole 12.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

In order to achieve the purpose, the invention adopts the technical scheme that: a rapid die and a coating technology based on a polymer injection technology, wherein the polymer injection technology uses a digital abs resin material developed by Stratasys company, ion evaporation coating is adopted during coating, the coating material is metallic chromium, and the thickness is 10-20 μm;

step 1, printing a maze type runner irrigator quick mould by adopting a digital abs resin material through a polymer injection technology.

In the process of manufacturing the mold by printing, hundreds of micro-nozzles in the printing device adopting the polymer injection technology inject a resin layer with the thickness of 20 microns into the tray in the area corresponding to the contour printing and molding of the model, and the rest areas are free of resin. At the same time, the resin was cured with uv light and each layer was adjusted to 16 microns by roller immediately after deposition, and repeated addition and curing of the resin layer produced a three-dimensional model in the resin. The traditional method generally adopts electric spark machining when manufacturing the irrigator mould, has high processing cost and long processing time, and shortens the manufacturing time to be within hours compared with the traditional mould manufacturing method;

and 2, plating metal chromium on the surfaces of the die cavity, the die core and the die parting surface 5 formed in the step 1 by adopting an evaporation coating technology to form a chromium coating.

The digital abs resin material is a high molecular polymer material, its coefficient of thermal conductivity is lower, easy to cause the accumulation of heat and take place the mould to lose efficacy in the course of injecting plastics, influence the service life of the mould, the mould cost to adopt metal printing is too high, print the time overlength; as shown in fig. 9 and 10, the advantages of the chrome plating can be clearly shown from the three-dimensional topography of the chrome plating and the final injection product, the strength of the parting surface of the mold is increased by arranging the chrome plating on the surface of the mold, the defect that the resin mold is not wear-resistant is overcome, the service life is prolonged, the heat dissipation capacity of the mold can be enhanced by the chrome plating, the defects that the digital abs resin material mold is not temperature-resistant and the utilization frequency is low are overcome, the use frequency of the digital abs material mold is increased, the mold reusability is high, and the production cost is reduced.

In the step 1, in the process of printing the cavity and the core inside the mold, ultraviolet light is adopted to perform roughness treatment on the cavity and the core simultaneously. The method reduces the roughness of the surface of the die, and the surface of the die is easy to be tightly combined with the coating.

As shown in fig. 1 to 8, the mold has a one-mold two-cavity structure, which can ensure balance during injection molding and can be easily molded. The mold comprises a cavity 1, a sprue 2, an upper mold runner 31, a lower mold runner 32, a sprue bush mounting hole 4, a chromium plating layer, a pit 6, a labyrinth runner 7, a cold material well 8, a grid 9, a first ejector rod hole 10, a second ejector rod hole 12 and a boss 11, wherein the diameter of the first ejector rod hole 10 is large, the main effect is achieved in the ejection process of a plastic part, and the diameter of the second ejector rod hole 12 is small, so that the auxiliary effect is achieved in the ejection process. The whole rapid die adopts the form of the insert, firstly, the processing is convenient, and the difficulty of the processing is reduced by the form of the insert due to the complex structure of the die. Secondly be convenient for shaping and drawing of patterns, the gaseous discharge of shaping time is favorable to in the space that the mold insert periphery exists, also can avoid the product to take place the sticking phenomenon and lead to difficult drawing of patterns. Meanwhile, the strength of the die can be increased, the material can be saved, and the cost can be reduced. The use of inserts in small volume production reduces the amount of printing required and increases the stability against heat and mechanical loads during injection molding.

The sprue is located at the center of the mold and is next to the runner, the tail end of the runner is a rectangular gate 2, the gate 2 is connected with the mold cavity and the runner, and a ejector rod hole is formed in one side of the mold core and used for ejecting a formed part after injection molding at each time. The whole material of the die is digital abs, and the die is formed by adopting a polymer injection technology. The surface of the mould is covered with a metal chromium plating layer.

Go up the mould center and set up the sprue, the sprue entrance sets up runner cover mounting hole 4, and sprue exit intercommunication goes up mould subchannel 31, and the end of going up mould subchannel 31 sets up runner 2 and cavity 1 intercommunication.

The lower mould corresponds and goes up the mould sprue position and is provided with cold burden well 8, corresponds and goes up mould subchannel 31 position and set up lower mould subchannel 32, and cold burden well 8 intercommunication lower mould subchannel 32 corresponds and sets up the core in 1 position lower mould of mould cavity, and labyrinth runner 7 sets up on 5 surfaces of lower mould die joint, sets up grid 9 on labyrinth runner 7, and the ejector pin hole setting runs through whole lower mould in 7 bottoms of labyrinth runner.

The lower die and the upper die are closed to form a labyrinth runner irrigator die cavity; two labyrinth type runner irrigator mold cavities are symmetrically arranged in the mold by taking the main runner as the center.

Wherein, the chrome plating covers the contact surface of the die cavity and the die core and the whole parting surface 5, the concave pit 6 and the convex platform 11 are matched to ensure the positioning in the injection molding process, and the concave pit 6 and the convex platform 11 have a draft angle of 5-15 degrees.

The cold burden well 8 is positioned under the sprue bush mounting hole 4, the sub-runner 3 is arc-shaped, the cross section is circular, the cross section of the sprue 2 is rectangular, and the upper plane is flush with the plane of the mold.

The mold had the following dimensions: the horizontal length of the external dimension of the upper die is 160mm-180mm, the horizontal width is 50mm-70mm, and the height is 30 mm; the horizontal length of the size of a die cavity 1 in the die is 42.84mm, the horizontal width is 9.69mm, and the height is 3.06 mm; the space between the symmetrically arranged cavities 1 is 25mm-30mm, and the radius of the sprue bush mounting hole is 5 mm; the width of the labyrinth flow passage 7 is 1.02mm, and the height is 1.02 mm; the radius of the cold material well 8 is 3mm-4 mm. The horizontal length of the size of the pouring gate 2 is 3mm, the horizontal width is 1mm, and the height is 2 mm; the radius of the cross section of the runner 3 is 2mm, the radius of a sprue bush mounting hole is 5mm, the runner needs to be matched with a C-shaped sprue bush, a pit 6 is 5mm-10mm lower than the surface, and all right-angle edges on the outer side of the upper die are chamfered by 0.5mm-2 mm. The external dimension of the lower die is matched with that of the upper die, the horizontal length is 160mm-180mm, the horizontal width is 50mm-70mm, and the height is 31 mm; the radius of the first ejector rod hole is 1.25mm, the radius of the second ejector rod hole is 0.5mm, and the chamfer angles of all the right-angle edges on the outer side of the lower die are 0.5mm-2 mm.

The rapid die can improve the development speed of products and the flexibility degree of production, can quickly and conveniently manufacture the die, shortens the manufacturing period of the die, reduces the production cost and has good economic benefit. Compared with the present invention, the time cost can be reduced to 1/4 and the cost can be reduced to 1/3.

Claims

1. A method for processing a labyrinth-type runner irrigator quick mould is characterized by comprising the following steps of,

and 2, plating metal chromium on the surfaces of the mold cavity and the mold core of the rapid mold matrix and the parting surface (5) of the rapid mold matrix by adopting an evaporation coating technology to form a chromium coating.

2. The method for processing the labyrinth runner emitter rapid mold according to claim 1, wherein in step 1, during the process of printing the inner cavity and core of the rapid mold base, ultraviolet light is used to perform surface roughness treatment on the cavity and core.

3. The method for processing the quick mould of the labyrinth-type runner emitter according to claim 1, wherein in step 1, the digital abs resin is injected into the printing and molding area of the mould by a micro-nozzle of a printing device by using a polymer injection technology to form a resin layer, the resin layer is cured by using ultraviolet rays, and the digital abs resin layer is repeatedly added and cured by adjusting the thickness of the resin layer after deposition to form the quick mould matrix of the labyrinth-type runner emitter.

4. A quick mould of a labyrinth type runner irrigator is characterized in that the mould is divided into an upper mould and a lower mould;

the upper die comprises a cavity (1), a pouring gate (2), an upper die runner (31), a pouring gate sleeve mounting hole (4) and a chromium coating;

the lower die comprises a core, a cold material well (8) and a top rod hole; the core comprises a labyrinth runner (7) and a grid (9);

a main runner is arranged at the center of the upper die, a sprue bush mounting hole (4) is arranged at the inlet of the main runner, an upper die runner (31) is communicated with the outlet of the main runner, and a sprue (2) communicated with the cavity (1) is arranged at the tail end of the upper die runner (31);

a cold material well (8) is arranged at the position of the lower die corresponding to the main runner of the upper die, a lower die sub-runner (32) is arranged at the position corresponding to the upper die sub-runner (31), the cold material well (8) is communicated with the lower die sub-runner (32), a core is arranged at the position corresponding to the upper die cavity (1), the labyrinth runner (7) is arranged on the surface of the lower die parting surface (5), a grid (9) is arranged on the labyrinth runner (7), and the ejector rod hole is arranged at the bottom of the labyrinth runner (7) and penetrates through the whole lower die;

the whole core adopts an insert structure;

and chromium coatings are arranged on the contact surfaces of the cavity and the core and the parting surface (5) of the mould.

5. The quick mould for the labyrinth runner irrigator according to claim 4, wherein the horizontal cross-section of the upper mould runner (31) and the lower mould runner (32) is circular arc, and the vertical cross-section of the runner formed after the lower mould and the upper mould are closed is circular.

6. The quick labyrinth-type runner emitter mold according to claim 5, wherein the gate (2) is a cuboid structure, the height of the gate (2) is equal to the radius of the upper mold runner (31), and the upper plane of the gate (2) is flush with the parting surface (5) of the mold.

7. The rapid labyrinth-type flow-channel emitter die as claimed in claim 4, wherein the chrome plating has a thickness of 10-20 μm.

8. The labyrinth-type runner emitter rapid mold according to claim 4, wherein the ejector rod holes are divided into a first ejector rod hole (10) and a second ejector rod hole (12), the first ejector rod hole (10) is symmetrically arranged at the end parts of the two labyrinth-type runner emitter mold cavities by taking the main runner as a center, and the second ejector rod hole (12) is symmetrically arranged at the bottom part of the labyrinth runner (7) by taking the main runner as a center; the radius of the first ejector rod hole (10) is larger than that of the second ejector rod hole (12).

9. The quick mould of a labyrinth-type runner irrigator according to claim 4, wherein four corners of the upper mould parting surface (5) are provided with pits (6), four corners of the lower mould parting surface (5) are provided with bosses (11), and the pits (6) are matched with the bosses (11) in an inserting manner.

10. The quick mould of the labyrinth-type runner emitter according to claim 9, wherein the pits (6) and the bosses (11) are provided with draft angles of 5-15 °.