This application claims the benefit of priority from Brazilian Patent Application No. 1020220138109, filed Jul. 12, 2022, the content of which is incorporated herein by reference.
The present invention refers to the field of technologies related to injection processes for obtaining spray nozzles. More particularly, the present invention discloses a process for injecting ceramics (ceramic inserts) for manufacturing spray nozzles through the use of so-called water stop.
The traditional ceramic material injection process consists of using conventional molds, using dummy pins and closing pins to define the internal geometry of the part. However, this process has limitations that are mainly related to the details in both the external and internal shape of the ceramic parts.
The ceramic injection process using the water stop was developed through the need to inject ceramics (spray nozzle inserts) to manufacture parts with high dimensional accuracy and complex internal geometries.
The present invention discloses a ceramic injection process (ceramic inserts) for manufacturing spray nozzles using the so-called water stop. In order to make it possible to inject the ceramic inserts of the spray nozzles using the water stop technique, it is necessary to divide the process into steps.
The Main Steps are:
In order to obtain the ceramic part using the injection process using the water stop (insertion of spray nozzles), it is also necessary to carry out the following secondary steps:
In order to obtain a complete visualization of the object of this invention, the figures of the present invention are presented in their preferred configuration:
In order to be able to inject ceramics (ceramic inserts for spray nozzles) using the water stop technique, it is necessary to divide the process into steps. The main steps are:
In order to obtain the ceramic part using the injection process using the water stop (insertion of spray nozzles), it is also necessary to carry out the following secondary steps:
The injection of the water stop is made in polymeric material, as can be seen in
For the injection of cores in polymeric material, the technical data sheets of the materials and injectors are used.
For the step of overinjecting the ceramic using the water stop polymeric, a feedstock of ceramic material is used, which allows the injection of the ceramic, as can be seen in
In order to make possible the overinjecting of the ceramic, the polymeric cores are inserted inside the ceramic injection molds, as shown in
For the overinjecting of ceramics, the technical data sheets of the materials and injection machines are used.
After performing the ceramic overinjecting step, the core rods are mechanically cut in order to reduce the amount of polymeric material to be dissolved as much as possible, as can be seen in
For the chemical dissolution process of the polymeric cores, solvents are used to chemically dissolve the polymers.
To optimize the dissolution process, the parts are placed in “cradles” as shown in
In another method used in the dissolution process using solvent, the parts are placed in perforated stainless steel trays, as can be seen in
After the chemical dissolution process, it is possible to obtain the ceramic part (ceramic insert) from the spray nozzle in which the ceramic injection process was used, using the water stop polymer.
After this step, the ceramic parts follow the processes of chemical/water and thermal debinding and, later, the sintering process according to the data sheet of the feedstock used to finalize the production process. Such processes are carried out through the so-called secondary steps, which are common in the manufacture of industrial technical ceramic parts.
In Water Debinding, parts are placed in perforated stainless steel trays and submerged in water at a specific temperature and time.
In chemical debinding, the parts are placed in stainless steel trays that are submerged in solvent at room temperature in boxes that are placed on shelves with pneumatic activation to move the solvent.
This process consists of heating the parts in an oven at around 300° C.
After the thermal debinding process (pre-sinter), the parts have a brown visual appearance, as shown in
Sintering is the last stage of the ceramic production process, in which the objective is to sinter the ceramic. It consists of a stage of heating the part in an oven at around 1600° C. After the sintering process, the parts look white, as shown in
Number | Date | Country | Kind |
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1020220138109 | Jul 2022 | BR | national |