阅读说明：本技术 一种通信陶瓷介质滤波器射出成型生产技术 (Injection molding production technology of communication ceramic dielectric filter ) 是由 高亮 卫秀娟 于 2020-07-17 设计创作，主要内容包括：本发明公开了一种通信陶瓷介质滤波器射出成型生产技术,涉及陶瓷介质滤波器加工工艺技术领域,具体为一种通信陶瓷介质滤波器射出成型生产技术,陶瓷复合材料制作原料包括：陶瓷粉料、塑化剂、粘结剂等添加剂；所述其原料以重量份占比如下：陶瓷粉料重量占比为65％；塑化剂重量占比为15-20％；粘结剂重量占比为15-20％；其他添加剂重量占比为3-5％。该通信陶瓷介质滤波器射出成型生产技术,实现陶瓷介质滤波器一次注塑成型,既保证陶瓷滤波器主体材质的密实性、均匀性,又确保尺寸精确度和制品的一致性,降低的不良品率。还能减少陶瓷滤波器后续的机加工工序,是提高陶瓷滤波器生产效率、降低生产成本、实现批量化生产的优选方案。(The invention discloses an injection molding production technology of a communication ceramic dielectric filter, which relates to the technical field of ceramic dielectric filter processing technology, in particular to an injection molding production technology of a communication ceramic dielectric filter, wherein the ceramic composite material comprises the following raw materials: additives such as ceramic powder, plasticizer, binder and the like; the raw materials comprise the following components in parts by weight: the weight ratio of the ceramic powder is 65 percent; the weight percentage of the plasticizer is 15-20%; 15-20% of binder; the weight percentage of other additives is 3-5%. The injection molding production technology of the communication ceramic dielectric filter realizes one-time injection molding of the ceramic dielectric filter, guarantees the compactness and uniformity of the material of the ceramic filter main body, guarantees the dimensional accuracy and the consistency of products, and reduces the defective product rate. The subsequent machining process of the ceramic filter can be reduced, and the method is a preferred scheme for improving the production efficiency of the ceramic filter, reducing the production cost and realizing batch production.)

1. An injection molding production technology of a communication ceramic dielectric filter is characterized in that: the ceramic composite material comprises the following raw materials: additives such as ceramic powder, plasticizer, binder and the like; the raw materials comprise the following components in parts by weight: the weight ratio of the ceramic powder is 65 percent; the weight percentage of the plasticizer is 15-20%; 15-20% of binder; the weight percentage of other additives is 3-5%.

2. The injection molding production technique of a communication ceramic dielectric filter according to claim 1, wherein: the production process of the ceramic filter injection molding method comprises the following specific operation steps:

(1) stirring and mixing the ceramic powder, the plasticizer, the binder and other additives by a stirrer to obtain a ceramic composite material after mixing and stirring uniformly, wherein the stirring and mixing time of the materials is 60-90 min;

(2) uniformly pouring the ceramic composite material mixed in the step (1) into an internal mixer, then introducing into a granulator to realize mixing treatment, and processing the ceramic composite material through the granulator to prepare ceramic granules;

(3) enabling the ceramic granules prepared in the step (2) to pass through the matching between a screw rod and a charging barrel of a ceramic injection molding machine, and adding the granules into the charging barrel after the granules are precisely metered; heating the cylinder to plasticize the ceramic particles into a pasty melt; then, the pasty melt material is stirred uniformly again by the rotation and the pressure of the injection molding screw rod, injected into a metal mold cavity and uniformly filled into each fine part in the mold cavity; solidifying the ceramic melt material by cooling the metal mold cavity and other processes; obtaining a ceramic filter green body with uniform internal density, good consistency and good accuracy of external hole site size after demoulding, please refer to fig. 2;

(4) heating the ceramic green body prepared in the step (3) in an environment-friendly thermal degreasing furnace, and removing additive components such as a plasticizer, a binder and the like added in the step (1) through thermal degreasing or other physical processes to obtain a degreased ceramic filter green body, wherein the temperature environment in the heating degreasing process of the ceramic green body is 560 ℃;

(5) and (4) putting the ceramic filter biscuit prepared in the step (4) into a sintering furnace, and sintering, solidifying and molding the ceramic biscuit by using a 5-stage temperature control method, so as to obtain the ceramic filter body with uniform internal density and accurate external form and position tolerance.

3. An injection molding production technique for a communication ceramic dielectric filter according to claim 2, wherein: the heating temperature of the charging barrel in the step (3) is required to be kept above 280 ℃.

4. An injection molding production technique for a communication ceramic dielectric filter according to claim 2, wherein: the temperature range of the sintering process in the step (5) is 250-1560 ℃; the sintering time was 30 hours.

Technical Field

The invention relates to the technical field of ceramic dielectric filter processing technology, in particular to a communication ceramic dielectric filter injection molding production technology.

Background

The ceramic dielectric filter is a microwave filter which adopts a dielectric resonant cavity to obtain a frequency selection effect through multi-stage coupling, and has the advantages of large power capacity, low insertion loss, miniaturization, low loss, good temperature characteristic and the like, so the ceramic dielectric filter is widely applied to systems of mobile communication, microwave communication and the like, and the communication ceramic dielectric filter is one of high-added-value links of the whole 5G industrial chain, has wide market prospect, and is thus widely participated by domestic manufacturers.

But at the present stage, the following problems generally exist:

1. the ceramic filter green body is manufactured by adopting the traditional dry pressing method, the process is simple, the die abrasion is large, the production efficiency is low, the size deviation is large, and the qualification rate is low;

2. because the module pressurizes the powder in the cavity from the upper and lower directions during dry pressing, the pressure distribution borne by the powder is uneven, and agglomeration is easily formed, so that the ceramic green body has the defects of uneven internal density, large size and position difference, easy crushing and the like;

3. the uneven density of the green body shrinks unevenly when being sintered, pores and microcracks which are difficult to detect are formed inside the green body, and the problems of external deformation, green body cracking, layering and the like of the ceramic body can be caused seriously, so that the ceramic filter has the defects of low yield, incapability of well meeting the use requirements of people and the like.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a communication ceramic dielectric filter injection molding production technology, which solves the following problems in the background technology:

1. the ceramic filter green body is manufactured by adopting the traditional dry pressing method, the process is simple, the die abrasion is large, the production efficiency is low, the size deviation is large, and the qualified rate is low;

2. because the module pressurizes the powder in the cavity from the upper and lower directions during dry pressing, the pressure distribution borne by the powder is uneven, and agglomeration is easily formed, so that the ceramic green body has the defects of uneven internal density, large size and position difference, easy crushing and the like;

3. the uneven density of the green body shrinks unevenly during sintering, pores and microcracks which are difficult to detect are formed inside the green body, and the problems of external deformation, green body cracking, layering and the like of the ceramic body can be caused seriously, so that the yield of the ceramic filter is very low.

In order to solve the above problems, the present invention is implemented by the following technical scheme: an injection molding production technology of a communication ceramic dielectric filter, wherein the ceramic composite material comprises the following raw materials: additives such as ceramic powder, plasticizer, binder and the like; the raw materials comprise the following components in parts by weight: the weight ratio of the ceramic powder is 65 percent; the weight percentage of the plasticizer is 15-20%; 15-20% of binder; the weight percentage of other additives is 3-5%.

Optionally, the specific operation steps of the production process of the injection molding method of the ceramic filter are as follows:

(1) stirring and mixing the ceramic powder, the plasticizer, the binder and other additives by a stirrer to obtain a ceramic composite material after mixing and stirring uniformly, wherein the stirring and mixing time of the materials is 60-90 min;

(2) uniformly pouring the ceramic composite material mixed in the step (1) into an internal mixer, then introducing into a granulator to realize mixing treatment, and processing the ceramic composite material through the granulator to prepare ceramic granules;

(3) enabling the ceramic granules prepared in the step (2) to pass through the matching between a screw rod and a charging barrel of a ceramic injection molding machine, and adding the granules into the charging barrel after the granules are precisely metered; heating the cylinder to plasticize the ceramic particles into a pasty melt; then, the pasty melt material is stirred uniformly again by the rotation and the pressure of the injection molding screw rod, injected into a metal mold cavity and uniformly filled into each fine part in the mold cavity; solidifying the ceramic melt material by cooling the metal mold cavity and other processes; obtaining a ceramic filter green body with uniform internal density, good consistency and good accuracy of external hole site size after demoulding, please refer to fig. 2;

(4) heating the ceramic green body prepared in the step (3) in an environment-friendly thermal degreasing furnace, and removing additive components such as a plasticizer, a binder and the like added in the step (1) through thermal degreasing or other physical processes to obtain a degreased ceramic filter green body, wherein the temperature environment in the heating degreasing process of the ceramic green body is 560 ℃;

(5) and (4) putting the ceramic filter biscuit prepared in the step (4) into a sintering furnace, and sintering, solidifying and molding the ceramic biscuit by using a 5-stage temperature control method, so as to obtain the ceramic filter body with uniform internal density and accurate external form and position tolerance.

Optionally, the heating temperature of the barrel in the step (3) is required to be maintained above 560 ℃.

Optionally, the temperature range of the sintering process in the step (5) is 250-1560 ℃; the sintering time was 30 hours.

The invention provides an injection molding production technology of a communication ceramic dielectric filter, which has the following beneficial effects:

the product precision can be improved by optimizing the process procedures, namely the ceramic powder formula and banburying preparation, injection molding, degreasing and sintering:

1. mixing a proper organic carrier with ceramic powder, mixing at a certain temperature, drying and granulating to obtain an injection molding grade ceramic material, wherein the organic carrier comprises a plasticizer, a binder and the like;

2. heating the obtained injection-grade ceramic material after banburying in a machine barrel of an injection molding machine to convert the material into viscous melt, generating pressure under the combined action of a screw and the machine barrel, injecting the ceramic melt into a metal mold cavity at high speed, cooling and solidifying, and demolding to obtain a ceramic filter green body with required shape and precision;

3. in the injection molding link of the ceramic filter, higher requirements are put forward on the process links such as ceramic material formula, additives, banburying and the like, the better the melting property and the fluidity of the ceramic material, the higher the shape and the size accuracy of a green body injected into a die cavity, and therefore, the banburying link of the ceramic material is the key for realizing the injection molding precision control of the ceramic filter;

4. organic matters contained in the ceramic green body are removed by heating or other physical and chemical methods, degreasing is another key step after the injection molding of the ceramic filter, and the degreasing can affect the defects of deformation, cracking, internal micropores and the like of the ceramic filter;

5. densifying and sintering the ceramic green body at high temperature to obtain a dense ceramic filter ceramic component with required appearance shape, dimensional accuracy and microstructure, wherein the precision of the product is measured to be +/-2 microns;

the invention adopts a precise ceramic injection molding technology to realize one-time injection molding of the ceramic dielectric filter, thereby not only ensuring the compactness and uniformity of the material of the ceramic filter main body, but also ensuring the dimensional accuracy and the consistency of products, reducing the defective rate, reducing the subsequent machining procedures of the ceramic filter, and being a preferred scheme for improving the production efficiency of the ceramic filter, reducing the production cost and realizing batch production.

Drawings

FIG. 1 is a schematic view of the operation of the present invention;

FIG. 2 is a schematic view of the process of forming and solidifying the ceramic melt material according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.