阅读说明：本技术 一种防止熔融石英模壳脱蜡开裂渗蜡的制壳工艺方法 (Shell making process method for preventing dewaxing, cracking and wax infiltration of fused quartz mould shell ) 是由 杨如生 张雷 于 2020-12-24 设计创作，主要内容包括：本发明涉及制壳技术领域,具体公开了一种防止熔融石英模壳脱蜡开裂渗蜡的制壳工艺方法,制作蜡模并清洗蜡模模型,接着制作第一层、第二层面层模壳,制作第三层、第四层过渡层模壳,制作第五层固定层模壳,接着将模壳脱模并检测裂纹,有裂纹在垂直于裂纹方向缠绕高韧性镀锌铁丝,将有或无缠绕高韧性镀锌铁丝的模壳制作第六层、第七层、第八层和第九层固定层模壳,再封浆,干燥放置制成熔融石英模壳。本发明防止熔融石英模壳脱蜡开裂渗蜡的制壳工艺方法采用多层面层和加固层的方法,撒上熔融石英砂,干燥放置制作成熔融石英模壳,在熔融石英模壳脱蜡后,在垂直于裂纹方向缠绕高韧性镀锌铁丝,很好的解决了模壳开裂和渗蜡的问题。(The invention relates to the technical field of shell manufacturing, and particularly discloses a shell manufacturing process method for preventing a fused quartz mould shell from dewaxing, cracking and wax infiltration. The shell manufacturing process method for preventing the dewaxing cracking and the wax infiltration of the fused quartz mould shell adopts a method of a plurality of layers of surface layers and reinforcing layers, the fused quartz sand is scattered, the fused quartz mould shell is manufactured by drying and placing, and after the fused quartz mould shell is dewaxed, the high-toughness galvanized iron wire is wound in the direction vertical to the crack, so that the problems of the mould shell cracking and the wax infiltration are well solved.)

1. A shell making process method for preventing dewaxing, cracking and wax infiltration of a fused quartz mould shell is characterized in that a wax mould is made according to the shape of an alloy casting, and the mould shell is made after the wax mould is cleaned, and the process for making the mould shell is as follows:

s1, manufacturing a first-layer formwork: cleaning a wax mould, completely immersing the wax mould into a trough filled with 325-mesh zircon powder and silica sol, taking out, spraying calcined zircon sand into the trough for 100 meshes, drying and standing for 6-8 hours;

s2, manufacturing a second-layer formwork: immersing the first layer of mould shell into a trough filled with 200-mesh zircon powder, then extracting, spraying calcined zircon sand of 100 meshes, drying and standing for 7-9 hours;

s3, manufacturing a third layer and a fourth layer of a transition layer formwork: immersing the second layer of formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand 50-100 meshes, drying and standing for 6-7 hours, and preparing a fourth layer of formwork of the transition layer by the same preparation method;

s4, manufacturing a fifth reinforcing layer formwork: immersing the fourth layer of the formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand of 30-50 meshes to form a reinforcing layer, drying and standing for 6-7 hours;

s5, demolding and detecting cracks: dewaxing the prepared mould shell and detecting whether cracks exist, winding a high-toughness galvanized iron wire in a direction vertical to the cracks when the cracks exist, and continuing the following steps when the cracks do not exist;

s6, manufacturing a sixth reinforcing layer formwork: immersing the mould shell wound with the high-toughness galvanized iron wire or the mould shell without cracks into a material tank filled with mullite powder, then extracting, spraying 30-50 meshes of fused quartz sand, drying and standing for 6-7 hours;

s7, manufacturing a seventh reinforcing layer formwork, namely immersing the sixth reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 10-20 meshes of fused quartz sand, drying and standing for 5-6 hours;

s8, manufacturing an eighth reinforcing layer formwork, namely immersing the seventh reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 10-20 meshes of fused quartz sand, drying and standing for 5-6 hours;

s9, manufacturing a ninth reinforcing layer formwork, namely immersing the eighth reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 30-50 meshes of fused quartz sand, drying and standing for 5-6 hours;

s10, preparing a fused silica mould shell: and sealing the slurry of the formwork of the ninth reinforcing layer, and drying and standing for more than or equal to 24 hours.

Technical Field

The invention belongs to the technical field of shell making, and particularly relates to a shell making process method for preventing a fused quartz mould shell from dewaxing, cracking and wax infiltration.

Background

In the production of precision investment castings, the precision investment casting process is complex and comprises wax pattern pressing, wax pattern assembly, slurry dipping, sand spraying, drying, dewaxing, roasting, pouring, post-treatment and the like. During the processes of slurry dipping, sand pouring and drying, the slurry and the sand tightly cover the surface of the wax mould layer by layer, and a mould shell biscuit is formed on the surface of the wax mould. And after drying, melting the wax pattern in the mould shell biscuit in a high-temperature steam dewaxing kettle. In the dewaxing process, the thermal expansion coefficient of the wax mould is larger than that of the mould shell, so that the mould shell is easy to crack, thereby causing scrappage. Therefore, the problem of cracking and wax infiltration of the formwork during dewaxing is solved.

Disclosure of Invention

The invention aims to solve the problems by providing a shell manufacturing process method for preventing dewaxing cracking and wax infiltration of a fused silica mould shell.

In order to solve the technical problem, the invention provides 1. a shell making process method for preventing dewaxing, cracking and wax infiltration of a fused quartz mould shell, which comprises the following steps of making a wax mould according to the shape of an alloy casting, cleaning the wax mould and then making the mould shell:

manufacturing a first layer of formwork: cleaning a wax mould, completely immersing the wax mould into a trough filled with 325-mesh zircon powder and silica sol, taking out, spraying calcined zircon sand into the trough for 100 meshes, drying and standing for 6-8 hours;

manufacturing a second layer of formwork: immersing the first layer of mould shell into a trough filled with 200-mesh zircon powder, then extracting, spraying calcined zircon sand of 100 meshes, drying and standing for 7-9 hours;

manufacturing a third layer of a transition layer and a fourth layer of a transition layer: immersing the second layer of formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand 50-100 meshes, drying and standing for 6-7 hours, and preparing a fourth layer of formwork of the transition layer by the same preparation method;

manufacturing a fifth reinforcing layer formwork: immersing the fourth layer of the formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand of 30-50 meshes to form a reinforcing layer, drying and standing for 6-7 hours;

demolding and detecting cracks: dewaxing the prepared mould shell and detecting whether cracks exist, winding a high-toughness galvanized iron wire in a direction vertical to the cracks when the cracks exist, and continuing the following steps when the cracks do not exist;

manufacturing a sixth reinforcing layer formwork: immersing the mould shell wound with the high-toughness galvanized iron wire or the mould shell without cracks into a material tank filled with mullite powder, then extracting, spraying 30-50 meshes of fused quartz sand, drying and standing for 6-7 hours;

manufacturing a seventh reinforcing layer formwork, namely immersing the sixth reinforcing layer formwork into a material groove filled with mullite powder, then extracting, spraying fused quartz sand of 10-20 meshes, drying and standing for 5-6 hours;

manufacturing an eighth reinforcing layer formwork, namely immersing the seventh reinforcing layer formwork into a material groove filled with mullite powder, then extracting, spraying 10-20 meshes of fused quartz sand, drying and standing for 5-6 hours;

manufacturing a ninth reinforcing layer formwork, namely immersing the eighth reinforcing layer formwork into a material groove filled with mullite powder, then extracting, spraying 30-50 meshes of fused quartz sand, drying and standing for 5-6 hours;

preparing a fused quartz mould shell: and sealing the slurry of the formwork of the ninth reinforcing layer, and drying and standing for more than or equal to 24 hours.

The shell manufacturing process method for preventing the fused quartz mould shell from dewaxing, cracking and waxing has the beneficial effects that the shell manufacturing process method adopts a method of a plurality of layers of surface layers and reinforcing layers, the fused quartz sand is scattered, the fused quartz mould shell is manufactured by drying and placing, and after the fused quartz mould shell is dewaxed, the high-toughness galvanized iron wire is wound in the direction vertical to the crack, so that the problems of mould shell cracking and waxing are well solved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a process flow diagram of a shell manufacturing process for preventing dewaxing cracking and wax infiltration of a fused silica mold shell;

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 specification 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In one embodiment of the present invention, as shown in fig. 1, a shell manufacturing process for preventing dewaxing, cracking and wax infiltration of a fused silica mold shell is specifically disclosed, wherein a wax mold is manufactured according to the shape of an alloy casting, and the mold shell is manufactured after the wax mold is cleaned, wherein the process for manufacturing the mold shell specifically comprises the following steps:

s1, manufacturing a first-layer formwork: cleaning a wax mould, completely immersing the wax mould into a trough filled with 325-mesh zircon powder and silica sol, taking out, spraying calcined zircon sand into the trough for 100 meshes, drying and standing for 6-8 hours;

s2, manufacturing a second-layer formwork: immersing the first layer of mould shell into a trough filled with 200-mesh zircon powder, then extracting, spraying calcined zircon sand of 100 meshes, drying and standing for 7-9 hours;

s3, manufacturing a third layer and a fourth layer of a transition layer formwork: immersing the second layer of formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand 50-100 meshes, drying and standing for 6-7 hours, and preparing a fourth layer of formwork of the transition layer by the same preparation method;

s4, manufacturing a fifth reinforcing layer formwork: immersing the fourth layer of the formwork into a trough filled with mullite powder, then extracting, spraying fused quartz sand of 30-50 meshes to form a reinforcing layer, drying and standing for 6-7 hours;

s5, demolding and detecting cracks: dewaxing the prepared mould shell and detecting whether cracks exist, winding a high-toughness galvanized iron wire in a direction vertical to the cracks when the cracks exist, and continuing the following steps when the cracks do not exist;

s6, manufacturing a sixth reinforcing layer formwork: immersing the formwork wound with the high-toughness galvanized iron wire or the formwork without cracks into a trough filled with mullite powder, then taking out, spraying 30-50 meshes of fused quartz sand, drying and standing for 6-7 hours;

s7, manufacturing a seventh reinforcing layer formwork, namely immersing the sixth reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 10-20 meshes of fused quartz sand, drying and standing for 5-6 hours;

s8, manufacturing an eighth reinforcing layer formwork, namely immersing the seventh reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 10-20 meshes of fused quartz sand, drying and standing for 5-6 hours;

s9, manufacturing a ninth reinforcing layer formwork, namely immersing the eighth reinforcing layer formwork into a trough filled with mullite powder, then extracting, spraying 30-50 meshes of fused quartz sand, drying and standing for 5-6 hours;

s10, preparing a fused silica mould shell: and sealing the slurry of the formwork of the ninth reinforcing layer, and drying and standing for more than or equal to 24 hours.

In S2, before preparing to manufacture a second layer of formwork, the surface of the formwork which is easy to crack is covered with a heat absorbing material, so that wax is prevented from being heated and expanded when dewaxing is carried out, heat is absorbed by the heat absorbing material, and the phenomenon that the formwork cracks due to the heated and expanded wax is avoided.

The invention discloses a shell manufacturing process for preventing dewaxing, cracking and wax infiltration of a fused silica mould shell, which comprises the following steps of starting → manufacturing a wax mould → cleaning a wax mould model → manufacturing a first layer surface layer mould shell → manufacturing a second layer surface layer mould shell → manufacturing a third layer transition layer mould shell → manufacturing a fourth layer transition layer mould shell → manufacturing a fifth layer fixed layer mould shell → demoulding, detecting cracks → winding high-toughness galvanized iron wires in the direction vertical to the cracks with the cracks → manufacturing a sixth layer fixed layer mould shell with or without winding the high-toughness galvanized iron wires → manufacturing a seventh layer fixed layer mould shell → manufacturing an eighth layer fixed layer mould shell → manufacturing a ninth layer fixed layer mould shell → sealing slurry → drying placement → manufacturing the fused silica mould shell.

The above disclosure is only one preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the invention, which is defined by the claims and their equivalents.