Ceramic pump blank manufacturing process

Abstract

The invention relates to a manufacturing process of a ceramic pump blank. The manufacturing process comprises the steps of manufacturing a pump body runner wood mold, manufacturing a pump body runner gypsum female mold, assembling a mold, pouring a ceramic pump blank, pouring the ceramic pump blank, demolding, repairing the mold, airing and taking the mold. The pump body runner wood mold and the pump body runner gypsum female mold are combined and assembled into a combined mold with a ceramic pump blank cavity, and then a ceramic pump blank is formed through casting; and in the demolding process, the ceramic pump blank is not deformed or damaged. According to the ceramic pump blank manufacturing process, the ceramic slurry is manufactured into the ceramic pump blank, and preparation is made for subsequent ceramic pump body production.

Description

Technical Field

[0001] The invention relates to a ceramic pump blank manufacturing process, belonging to the technical field of ceramic pump production. Background Art

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of the impeller to transport liquids. Traditional centrifugal pumps are generally designed and manufactured with an all-metal structure and are widely used in various industrial fields. Due to the all-metal structure of the centrifugal pump, its flow-through parts (front pump cover, impeller, pump body, and rear pump cover) are all made of metal. The inner cavity of the pump body accommodates the impeller and is the main flow-through part for the liquid medium to be pumped through. When transporting highly corrosive or particulate liquid media, it is easily corroded and worn, resulting in a significant reduction in service life.

[0003] Ceramic centrifugal pumps use a layer of ceramic material on the inner wall of the pump body, namely the ceramic pump body, to greatly increase the service life of the pump body and thus the working life of the centrifugal pump by utilizing the excellent corrosion and wear resistance of the ceramic material. In the production process of the ceramic pump body, it is necessary to first make a ceramic pump blank for the ceramic pump body, and then go through the post-sintering process to sinter and solidify the ceramic pump blank into a ceramic pump body. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a ceramic pump blank manufacturing process, which forms a ceramic pump blank from ceramic slurry to prepare for the subsequent ceramic pump body production.

[0005] The object of the present invention is achieved in that: A ceramic pump blank manufacturing process comprises the following steps: Step S1, making a pump body flow channel wooden mold: according to the design shape and size of the pump body flow channel cavity of the ceramic pump, a corresponding pump body flow channel wooden mold is machined on a CNC machine tool; Step S2, making a pump body runner plaster master mold, including a runner plaster lower mold and a runner plaster upper mold: Step S2.1, making a gypsum chassis mold: according to the shape and size of the ceramic pump flow channel cavity design, pouring out a gypsum chassis mold blank, and then processing the gypsum chassis mold blank to the mold opening size to obtain a gypsum chassis mold; Step S2.2, installing an isolation layer: installing an isolation layer covering the gypsum chassis mold on the gypsum chassis mold, the shape and size of which are adapted to the gypsum chassis mold; according to the shape of the pump body flow channel wooden mold in step S1, making isolation pieces of corresponding shapes at different parts; all isolation pieces are tightly covered on the surface of the gypsum chassis mold to form an isolation layer; Step S2.3, pouring the gypsum lower mold of the pump body flow channel: surround the gypsum bottom plate mold coated with the isolation layer in step S2.2 with a surrounding board, pour gypsum slurry, solidify and demould to obtain the gypsum lower mold of the flow channel; Step S2.4, pouring the pump body runner plaster upper mold: same as steps S2.1 to S2.3, curing and demoulding to obtain the runner plaster upper mold; Step S3, mold assembly: the pump body runner plaster master mold obtained in step S2, i.e., the runner plaster lower mold in step S2.3 and the runner plaster upper mold in step S2.4, and the pump body runner wooden mold obtained in step S1 are combined to form a ceramic pump blank cavity in the space between the pump body runner plaster master mold and the pump body runner wooden mold; Step S4, pouring the ceramic pump blank: injecting pressurized ceramic slurry into the pump blank cavity of the gypsum mold assembled in step S3, and maintaining the pressure for a period of time to form a ceramic pump blank in the pump blank cavity; Step S5, demoulding: removing the runner plaster upper mold of the cast combined gypsum mold, taking another dry runner plaster upper mold to replace the removed original runner plaster upper mold, installing it on the combined gypsum mold, and then turning it over 180 degrees as a whole, so that the runner plaster lower mold of the combined gypsum mold is located at the top, removing the runner plaster lower mold, and the wet ceramic pump blank is located on the other runner plaster upper mold; Step S6, mold repair: repair irregular parts on the ceramic pump blank; Step S7, drying: placing the runner plaster upper mold and the ceramic pump blank as a whole in a cool place to dry; Step S8, taking out the mold: after the ceramic pump blank is dried, the pump body flow channel wooden mold is taken out from the vacant part of the pump cover of the ceramic pump blank, and the ceramic pump blank is taken out from the flow channel gypsum upper mold to complete the production of the ceramic pump blank.

[0006] Furthermore, the pump body flow channel wooden mold in step S1 includes two parts: an upper pump body flow channel wooden mold and a lower pump body flow channel wooden mold.

[0007] Furthermore, the gypsum chassis mold of step S2.1 includes a gypsum chassis upper mold and a gypsum chassis lower mold, and the pump body flow channel gypsum lower mold of step S2.3 is made by the gypsum chassis lower mold, and the pump body flow channel gypsum upper mold of step S2.4 is made by the gypsum chassis upper mold.

[0008] Furthermore, the isolation member in step S2.2 comprises a plurality of plastic plates and a plurality of copper sheets; each of the plastic plates and copper sheets is prefabricated according to the shapes of different parts of the wooden mold of the pump body flow channel in step S1.

[0009] Furthermore, the installation method of the isolation element includes: Drilling: drilling holes at various positions on the gypsum chassis mold, inserting pins into the drilled holes, fixing the plastic plate on the pins, and installing the plastic plate on the gypsum chassis mold by using the pins; Grooving: Grooves are dug at various positions on the gypsum chassis mold, and the copper sheet is fixed on the gypsum chassis mold through the dug grooves.

[0010] Furthermore, the enclosures in step S2.3 and step S2.4 are plastic soft boards or wooden boards.

[0011] Furthermore, the combined mold assembly method of step S3 is: placing the runner gypsum lower mold on a special base, placing the pump body runner lower wooden mold at the cavity position of the runner gypsum lower mold, placing a wooden core rod at the liquid outlet position of the pump blank, and then placing the pump body runner upper wooden mold on the pump body runner lower wooden mold; then placing the runner gypsum upper mold on the runner gypsum lower mold, and locking the runner gypsum upper mold and the runner gypsum lower mold.

[0012] Furthermore, the other runner gypsum upper mold of step S5 is obtained through step S2.4, and a release agent is sprayed on the inner wall of the runner cavity.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention prepares a pump body flow channel wooden mold first, and then prepares a pump body flow channel gypsum master mold through a gypsum base mold, and then combines the pump body flow channel wooden mold and the pump body flow channel gypsum master mold into a combined mold for pouring a ceramic pump blank. After pouring the ceramic pump blank using the combined mold, first take the flow channel gypsum upper mold, then install another flow channel gypsum upper mold, turn the whole over, then take the flow channel gypsum lower mold, complete demoulding, and finally dry it to obtain a ceramic pump blank with structural strength, so as to prepare for the subsequent production of ceramic centrifugal pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a process flow chart of a ceramic pump blank manufacturing process. DETAILED DESCRIPTION

[0015] See also Figure 1 The present invention relates to a ceramic pump blank manufacturing process, comprising the following steps: Step S1, making a pump body flow channel wooden mold: according to the design shape and size of the pump body flow channel cavity of the ceramic pump, a corresponding pump body flow channel wooden mold is processed on a CNC machine tool; the pump body flow channel wooden mold of step S1 comprises an upper pump body flow channel wooden mold and a lower pump body flow channel wooden mold; Step S2, making a pump body runner plaster master mold, including a runner plaster lower mold and a runner plaster upper mold: Step S2.1, making a gypsum chassis mold: according to the shape and size of the ceramic pump flow channel cavity design, pouring a gypsum chassis mold blank, and then processing the gypsum chassis mold blank to the mold opening size to obtain a gypsum chassis mold; the gypsum chassis mold comprises a gypsum chassis upper mold and a gypsum chassis lower mold; Step S2.2, install the isolation layer: install an isolation layer covering the upper mold of the gypsum chassis on the upper mold of the gypsum chassis, and its shape and size are compatible with the upper mold of the gypsum chassis; according to the shape of the wooden mold on the pump body flow channel in step S1, make isolation pieces of corresponding shapes in different parts; all isolation pieces are tightly covered on the surface of the upper mold of the gypsum chassis to form an isolation layer. At the same time, install an isolation layer covering the lower mold of the gypsum chassis on the lower mold of the gypsum chassis, and its shape and size are compatible with the lower mold of the gypsum chassis; according to the shape of the wooden mold under the pump body flow channel in step S1, make isolation pieces of corresponding shapes in different parts; all isolation pieces are tightly covered on the surface of the lower mold of the gypsum chassis to form an isolation layer; The isolation member includes a plurality of plastic plates and a plurality of copper sheets; each plastic plate and copper sheet is prefabricated according to the shape of different parts of the pump body flow channel wooden mold in step S1. The installation method of the isolation member includes: drilling holes: drilling holes at various positions on the gypsum chassis mold, inserting pins into the drilled holes, fixing the plastic plates on the pins, and installing the plastic plates on the gypsum chassis mold using the pins; digging grooves: digging grooves at various positions on the gypsum chassis mold, fixing the copper sheets on the gypsum chassis mold through the dug grooves; Step S2.3, pouring the pump body runner gypsum lower mold: surround the gypsum bottom plate lower mold coated with the isolation layer in step S2.2 with a surrounding board, pour gypsum slurry, solidify and demould to obtain the runner gypsum lower mold; the surrounding board is a plastic soft board or a wooden board; Step S2.4, pouring the gypsum upper mold of the pump body flow channel: surround the gypsum bottom plate upper mold covered with the isolation layer in step S2.2 with a surrounding board, pour gypsum slurry, solidify and demould to obtain the gypsum upper mold of the flow channel; the surrounding board is a plastic soft board or a wooden board; Step S3, mold assembly: Combine the pump body runner gypsum master mold obtained in step S2, that is, the runner gypsum lower mold of step S2.3 and the runner gypsum upper mold of step S2.4, and the pump body runner wooden mold obtained in step S1, and form a ceramic pump blank cavity in the space between the pump body runner gypsum master mold and the pump body runner wooden mold. In the specific operation, first place the runner gypsum lower mold on a special base, place the pump body runner lower wooden mold at the cavity position of the runner gypsum lower mold, place a wooden core rod at the liquid outlet position of the pump blank, and then place the pump body runner upper wooden mold on the pump body runner lower wooden mold. At this point, the pump body runner lower wooden mold, the pump body runner upper wooden mold and the core rod constitute the inner cavity mold of the ceramic pump blank cavity; then place the runner gypsum upper mold on the runner gypsum lower mold, and lock the runner gypsum upper mold and the runner gypsum lower mold to complete the assembly of the combined gypsum mold; Step S4, pouring the ceramic pump blank: injecting pressurized ceramic slurry into the pump blank cavity of the gypsum mold assembled in step S3, and maintaining the pressure for a period of time to form a ceramic pump blank in the pump blank cavity, reduce the internal pores of the ceramic blank, and improve the density of the ceramic pump blank; Step S5, demoulding: Since the newly formed ceramic pump blank has a large water content and has not formed structural strength, it cannot be directly taken out from the mold. Therefore, the following operations should be followed during demoulding: the runner plaster upper mold of the cast combined plaster mold is removed. To ensure smooth demoulding and prevent the damp ceramic pump blank from sticking to the inner wall of the mold, the operator gently taps the runner plaster upper mold shell during demoulding, and the tapping points are evenly distributed around the runner plaster upper mold shell, so that the ceramic pump body blank and the inner wall of the runner plaster upper mold cavity are separated in advance due to the tapping vibration; since the tapping force is limited, the vibration will not cause damage or deformation to the ceramic pump blank; Take another dry runner gypsum upper mold to replace the original runner gypsum upper mold that has been removed, and install it on the combined gypsum mold. The other runner gypsum upper mold is obtained through step S2.4, and a release agent is sprayed on the inner wall of its runner cavity to facilitate the subsequent removal of the ceramic pump blank from the upper mold; then the combined gypsum mold on which the other runner gypsum upper mold is reinstalled is turned 180 degrees as a whole, so that the runner gypsum lower mold of the combined gypsum mold is located at the top, and the runner gypsum lower mold is carefully removed in the same way as the runner gypsum upper mold is taken to ensure that the ceramic pump blank is not deformed or damaged, and finally the wet ceramic pump blank is left on the other runner gypsum upper mold; Step S6, mold repair: repair irregular parts on the ceramic pump blank, including indentations, burrs, excess parts, etc.; Step S7, drying: placing the runner plaster upper mold and the ceramic pump blank in a cool place to dry; during the drying process, as the water evaporates, the ceramic pump blank generates structural strength; Step S8, taking out the mold: After the ceramic pump blank is dried, it has sufficient structural strength. First, take out the pump body flow channel wooden mold and core rod from the vacant part of the pump cover of the ceramic pump blank, and then take out the ceramic pump blank from the flow channel gypsum upper mold to complete the production of the ceramic pump blank.

[0016] The present invention prepares a pump body flow channel wooden mold first, and then prepares a pump body flow channel gypsum master mold through a gypsum base mold, and then combines the pump body flow channel wooden mold and the pump body flow channel gypsum master mold into a combined mold for pouring a ceramic pump blank. After pouring the ceramic pump blank using the combined mold, first take the flow channel gypsum upper mold, then install another flow channel gypsum upper mold, turn the whole over, then take the flow channel gypsum lower mold, complete demoulding, and finally dry it to obtain a ceramic pump blank with structural strength, so as to prepare for the subsequent production of ceramic centrifugal pumps.

[0017] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A process for manufacturing a ceramic pump blank, characterized in that: The following steps are involved: Step S1, making a pump body flow channel wooden mold: according to the design shape and size of the pump body flow channel cavity of the ceramic pump, a corresponding pump body flow channel wooden mold is machined on a CNC machine tool; Step S2, making a pump body runner plaster master mold, including a runner plaster lower mold and a runner plaster upper mold: Step S2.1, making a gypsum chassis mold: according to the shape and size of the ceramic pump flow channel cavity design, pouring out a gypsum chassis mold blank, and then processing the gypsum chassis mold blank to the mold opening size to obtain a gypsum chassis mold; Step S2.2, installing an isolation layer: installing an isolation layer covering the gypsum chassis mold on the gypsum chassis mold, the shape and size of which are adapted to the gypsum chassis mold; according to the shape of the pump body flow channel wooden mold in step S1, making isolation pieces of corresponding shapes at different parts; all isolation pieces are tightly covered on the surface of the gypsum chassis mold to form an isolation layer; Step S2.3, pouring the gypsum lower mold of the pump body flow channel: surround the gypsum bottom plate mold coated with the isolation layer in step S2.2 with a surrounding board, pour gypsum slurry, solidify and demould to obtain the gypsum lower mold of the flow channel; Step S2.4, pouring the pump body runner plaster upper mold: same as steps S2.1 to S2.3, curing and demoulding to obtain the runner plaster upper mold; Step S3, mold assembly: the pump body runner plaster master mold obtained in step S2, i.e., the runner plaster lower mold in step S2.3 and the runner plaster upper mold in step S2.4, and the pump body runner wooden mold obtained in step S1 are combined to form a ceramic pump blank cavity in the space between the pump body runner plaster master mold and the pump body runner wooden mold; Step S4, pouring the ceramic pump blank: injecting pressurized ceramic slurry into the pump blank cavity of the gypsum mold assembled in step S3, and maintaining the pressure for a period of time to form a ceramic pump blank in the pump blank cavity; Step S5, demoulding: removing the runner plaster upper mold of the cast combined gypsum mold, taking another dry runner plaster upper mold to replace the removed original runner plaster upper mold, installing it on the combined gypsum mold, and then turning it over 180 degrees as a whole, so that the runner plaster lower mold of the combined gypsum mold is located at the top, removing the runner plaster lower mold, and the wet ceramic pump blank is located on the other runner plaster upper mold; Step S6, mold repair: trimming irregular parts on the ceramic pump blank; Step S7, drying: placing the runner plaster upper mold and the ceramic pump blank as a whole in a cool place to dry; Step S8, taking out the mold: after the ceramic pump blank is dried, the pump body flow channel wooden mold is taken out from the vacant part of the pump cover of the ceramic pump blank, and the ceramic pump blank is taken out from the flow channel gypsum upper mold to complete the production of the ceramic pump blank.

2. The ceramic pump blank manufacturing process according to claim 1 is characterized in that: The pump body flow channel wooden mold in step S1 comprises two parts: an upper pump body flow channel wooden mold and a lower pump body flow channel wooden mold.

3. The ceramic pump blank manufacturing process according to claim 1 is characterized in that: The gypsum chassis mold of step S2.1 includes a gypsum chassis upper mold and a gypsum chassis lower mold, and the pump body flow channel gypsum lower mold of step S2.3 is made by the gypsum chassis lower mold, and the pump body flow channel gypsum upper mold of step S2.4 is made by the gypsum chassis upper mold.

4. The ceramic pump blank manufacturing process according to claim 1 is characterized in that: The isolation piece in step S2.2 comprises a plurality of plastic plates and a plurality of copper sheets; each of the plastic plates and copper sheets is prefabricated according to the shapes of different parts of the wooden mold of the pump body flow channel in step S1.

5. The ceramic pump blank manufacturing process according to claim 4 is characterized in that: The installation method of the isolation member comprises: Drilling: drilling holes at various positions on the gypsum chassis mold, inserting pins into the drilled holes, fixing the plastic plate on the pins, and installing the plastic plate on the gypsum chassis mold by using the pins; Digging grooves: digging grooves at various positions on the gypsum chassis mold, and fixing the copper sheet on the gypsum chassis mold through the dug grooves.

6. The ceramic pump blank manufacturing process according to claim 1 is characterized in that: The enclosure panels in step S2.3 and step S2.4 are plastic soft panels or wooden panels.

7. The process for manufacturing a ceramic pump blank according to claim 1, characterized in that: The combined mold assembly method of step S3 is as follows: placing the runner gypsum lower mold on a special base, placing the pump body runner lower wooden mold at the cavity position of the runner gypsum lower mold, placing a wooden core rod at the liquid outlet position of the pump blank, and then placing the pump body runner upper wooden mold on the pump body runner lower wooden mold; then placing the runner gypsum upper mold on the runner gypsum lower mold, and locking the runner gypsum upper mold and the runner gypsum lower mold.

8. The ceramic pump blank manufacturing process according to claim 1 is characterized in that: The other runner gypsum upper mold in step S5 is obtained through step S2.4, and a release agent is sprayed on the inner wall of the runner cavity.

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