CN115320026A - One-time injection molding method of injection pump shell - Google Patents

One-time injection molding method of injection pump shell Download PDF

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Publication number
CN115320026A
CN115320026A CN202211019397.XA CN202211019397A CN115320026A CN 115320026 A CN115320026 A CN 115320026A CN 202211019397 A CN202211019397 A CN 202211019397A CN 115320026 A CN115320026 A CN 115320026A
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China
Prior art keywords
mold
precoated sand
jet pump
injection
injection molding
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Pending
Application number
CN202211019397.XA
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Chinese (zh)
Inventor
郑爱军
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Individual
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Individual
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Priority to CN202211019397.XA priority Critical patent/CN115320026A/en
Publication of CN115320026A publication Critical patent/CN115320026A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/76—Cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C2045/0077—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping removing burrs or flashes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76531—Temperature

Abstract

The invention relates to a one-time injection molding method of a jet pump shell, belonging to the technical field of jet pumps and comprising the following steps: s1, preparing precoated sand, namely extruding the precoated sand into a precoated sand mold core through a precoated sand mold, wherein the shape of the precoated sand mold core is consistent with that of a water inlet channel of a jet pump; s2, preparing an injection mold, wherein the injection mold is a forming mold of the injection pump shell, the coated sand mold core is arranged in the forming mold after the forming mold is opened, and the forming mold is closed; s3, operating an injection molding machine, extruding a plastic melt into an injection mold by the injection molding machine, coating a precoated sand mold core with the plastic melt, maintaining pressure, preserving heat and cooling, and then injecting a pump shell for molding; s4, opening the mold, and taking out the jet pump shell; s5, removing a pouring gate and burrs of a flash; s6, carrying out sand removing treatment on the jet pump shell with the mold core coated with the sand, wherein the method is reasonable, and the mold core is made of the coated sand, and the coated sand is placed in an injection mold to form the jet pump shell.

Description

One-time injection molding method of injection pump shell
Technical Field
The invention belongs to the technical field of jet pumps, and particularly relates to a one-time injection molding method of a jet pump shell.
Background
The jet pump uses the fluid flow back pressurized by the impeller to form negative pressure at the water inlet, and sucks the external liquid into the pump body, thereby realizing the liquid delivery. Compared with a vortex pump, the jet pump has the advantages of strong suction, stable self-suction and high efficiency, and is widely applied to various industrial fields of mining machinery, ship manufacturing, petrochemical industry and the like.
Most of common injection pump casings are formed by casting metal materials through sand mold casting, however, the pump body made of the metal materials is poor in corrosion resistance, and the problem that the pump body is easily frozen and cracked under severe cold conditions due to water storage inside the pump body is solved. Moreover, because the channel structure inside the partition wall is complex, the pump body can only be manufactured by casting and molding metal materials, and the channel is processed by adding a mold core. The pump body cannot be manufactured in a plastic material injection molding mode due to difficult demolding in the injection molding; even if the split structure is adopted for manufacturing, the split structure is difficult to fix together due to the complex shape inside the pump body.
The structure of the existing jet pump, for example, the Chinese patent discloses an invention with the patent number of 201720803680.X as a pump body of the jet pump, which comprises a cylindrical main body with a pump cavity, wherein the bottom of the main body is provided with a water inlet; the main body and the injection seat are both made of plastics, and the contact surface of the injection seat and the main body is tightly attached, sealed and fixed in the main body, so that a first medium passage communicated with the water inlet and the injection port and a second medium passage communicated with the pump cavity, the backwater opening and the injection port are formed in the injection seat; a first connecting convex body is arranged on the inner wall of the main body, which is positioned on one side of the bottom of the main body, which corresponds to the water inlet, the rear side surface of the first connecting convex body is superposed with the inner wall of the main body, a joint surface is formed on the upper surface of the first connecting convex body, and the injection seat and the main body are in close contact with the bottom surface of the injection seat through the joint surface of the upper surface of the first connecting convex body, so that the injection seat and the inner wall of the main body form sealing; what above-mentioned structure adopted is split type structure, what adopt between the injection seat of this kind of structure and the main part is that ultrasonic bonding perhaps connects through the fastener, though can reduce the production degree of difficulty of jet pump like this, both need higher cooperation precision, if there is a infiltration, then the lift of whole jet pump just can not reach the height of settlement.
Disclosure of Invention
The invention aims to provide a one-time injection molding method which is reasonable in method, adopts precoated sand to make a mold core, and places the mold core in an injection mold to form a jet pump shell.
The purpose of the invention is realized as follows:
a one-shot injection molding method of a jet pump housing, comprising the steps of:
s1, preparing precoated sand, namely extruding the precoated sand into a precoated sand mold core through a precoated sand mold, wherein the shape of the precoated sand mold core is consistent with that of a water inlet channel of a jet pump;
s2, preparing an injection mold, wherein the injection mold is a forming mold of the injection pump shell, after the forming mold is opened, the precoated sand mold core is arranged in the forming mold, the forming mold is closed, and the injection mold is of a mold-cavity structure;
s3, the injection molding machine works, the injection molding machine extrudes the plastic melt into an injection mold, the plastic melt coats the precoated sand mold core, and the injection pump shell is molded after the pressure maintaining, heat preservation and cooling of the injection mold;
s4, opening the forming mold, and taking out the shell of the jet pump;
s5, removing a pouring gate and burrs of a flash;
and S6, carrying out sand removing treatment on the jet pump shell with the precoated sand mold core.
In the one-time injection molding method of the jet pump shell, the water inlet channel of the jet pump is provided with a water inlet, a water outlet I and a water outlet II which are communicated with each other, and the precoated sand mold core is provided with a core matched with the water inlet, the water outlet I and the water outlet II.
In the above one-shot injection molding method of the jet pump housing, the plastic melt is made of nylon.
In the one-time injection molding method of the jet pump housing, the precoated sand mold core in the step S1 injects precoated sand into a precoated sand mold through a precoated sand core shooter, the air pressure is controlled to be 5-8mpa, the precoated sand mold is heated to 200-350 ℃, the pressure maintaining time is 30-60S, and the precoated sand is solidified to prepare the precoated sand mold core.
In the above one-shot injection molding method for a jet pump housing, the coated sand is resin coated sand that has been repeatedly recycled.
In the one-time injection molding method of the injection pump shell, the temperature of the injection mold in S3 is 40-50 ℃, the injection pressure of the injection molding machine is 200-600bar, and the dwell time is 20-60S.
In the above one-shot injection molding method for a jet pump housing, the jet pump housing with the coated sand core in S6 is cleaned by an ultrasonic cleaning device.
In the above one-shot injection molding method of the jet pump housing, the jet pump housing with the precoated sand core in S6 is sand-blasted by a small-sized sand blaster.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that:
according to the invention, the precoated sand mold core of the water outlet channel is formed, the precoated sand mold core is placed in an injection mold, the injection molding machine extrudes plastic melt into the mold, the plastic melt wraps the precoated sand mold core, and the injection pump shell after pressure maintaining cooling forming is sent into an ultrasonic cleaning device to clean the precoated sand mold core; the injection pump mainly comprises a water inlet channel, a mold core of a precoated sand molding water inlet channel structure is arranged in the injection pump, and the mold core is provided with a precoated sand mold core structure.
Drawings
FIG. 1 is a schematic view of the manufacturing method of the present invention.
Fig. 2 is a schematic view of the structure of the ejector pump of the present invention.
Fig. 3 is a cross-sectional view of the jet pump of the present invention.
FIG. 4 is a schematic structural diagram of the precoated sand mold core of the present invention.
FIG. 5 is a cross-sectional view of the precoated sand core of the present invention.
1-precoated sand mold core; 2-water inlet channel of jet pump.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings:
as shown in fig. 1-5: a one-shot injection molding method of a jet pump housing, comprising the steps of:
s1, preparing precoated sand, namely extruding the precoated sand into a precoated sand mold core 1 through a precoated sand mold, wherein the shape of the precoated sand mold core 1 is consistent with that of a water inlet channel 2 of a jet pump;
s2, preparing an injection mold, wherein the injection mold is a forming mold of the injection pump shell, after the forming mold is opened, the precoated sand mold core 1 is arranged in the forming mold, the forming mold is closed, and the injection mold is of a mold-cavity structure;
s3, operating an injection molding machine, extruding a plastic melt into an injection mold by the injection molding machine, coating the plastic melt on the precoated sand mold core 1, maintaining the pressure and the temperature of the injection mold, and cooling the plastic melt, and then injecting a pump shell for molding;
s4, opening the forming mold, and taking out the shell of the jet pump;
s5, removing a pouring gate and burrs of a flash;
and S6, carrying out sand removing treatment on the jet pump shell with the precoated sand mold core 1.
In the one-time injection molding method of the jet pump shell, the water inlet channel 2 of the jet pump is provided with a water inlet, a water outlet I and a water outlet II which are communicated with each other, and the precoated sand mold core 1 is provided with a core matched with the water inlet, the water outlet I and the water outlet II.
In the one-time injection molding method of the jet pump housing, the plastic melt is made of the nylon material, so that the strength and the toughness of the jet pump housing can be improved, and compared with the traditional metal material, the nylon material has stronger frost resistance.
In the one-time injection molding method of the jet pump shell, the precoated sand mold core 1 in the step S1 injects precoated sand into a precoated sand mold through a precoated sand core shooter, the air pressure is controlled to be 5-8mpa, the precoated sand mold is heated to 200-350 ℃, the pressure maintaining time is 30-60S, and the precoated sand is solidified to prepare the precoated sand mold core.
In the above one-shot injection molding method for a jet pump housing, the precoated sand is resin precoated sand that has been repeatedly recycled many times, and the precoated sand can be recycled, so that the manufacturing cost can be reduced.
In the one-step injection molding method of the injection pump shell, the temperature of the injection mold in the step S3 is 40-50 ℃, the injection pressure of the injection molding machine is 200-600bar, and the dwell time is 20-60S.
In the above one-shot injection molding method for a jet pump housing, the jet pump housing with the precoated sand mold core in S6 is cleaned in an ultrasonic cleaning device, and the cleaned jet pump housing can be put into use.
In the above one-shot injection molding method for a jet pump housing, the jet pump housing with the precoated sand mold core in S6 is subjected to sand blasting treatment by a small-sized sand blasting machine, the jet pump housing with the precoated sand mold core is subjected to sand blasting treatment by the small-sized sand blasting machine, the precoated sand mold core is flushed by fine sand ejected out, and the precoated sand mold core is flushed from the jet pump housing, and the small-sized sand blasting machine is the prior art and is not described herein any more.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (8)

1. A one-time injection molding method of a jet pump shell is characterized in that: the method comprises the following steps:
s1, preparing precoated sand, namely extruding the precoated sand into a precoated sand mold core (1) through a precoated sand mold, wherein the shape of the precoated sand mold core (1) is consistent with that of a water inlet channel (2) of a jet pump;
s2, preparing an injection mold, wherein the injection mold is a forming mold of the injection pump shell, after the forming mold is opened, the precoated sand mold core (1) is arranged in the forming mold, the forming mold is closed, and the injection mold is of a mold-cavity structure;
s3, the injection molding machine works, the injection molding machine extrudes the plastic melt into an injection mold, the plastic melt coats the precoated sand mold core (1), and the plastic melt is subjected to pressure maintaining, heat preservation and cooling by the injection mold and then is injected into a pump shell for molding;
s4, opening the forming mold, and taking out the jet pump shell;
s5, removing a pouring gate and burrs of a flash;
s6, carrying out sand removing treatment on the jet pump shell with the precoated sand mold core (1).
2. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: be provided with water inlet, delivery port one and delivery port two that communicate each other on jet pump inhalant canal (2), be provided with the core with water inlet, delivery port one and two adaptations of delivery port on tectorial membrane sand mold core (1).
3. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: the plastic melt is made of nylon.
4. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: and the precoated sand mold core (1) in the step S1 injects precoated sand into a precoated sand mold through a precoated sand core shooter, the air pressure is controlled to be 5-8mpa, the precoated sand mold is heated to 200-350 ℃, and the pressure maintaining time is 30-60S, so that the precoated sand is cured, and the precoated sand mold core is prepared.
5. The one-shot injection molding method of a jet pump housing of claim 4, wherein: the precoated sand is resin precoated sand which is repeatedly recycled.
6. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: the temperature of the injection mold in the S3 is 40-50 ℃, the injection pressure of the injection molding machine is 200-600bar, and the pressure maintaining time is 20-60S.
7. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: and in the S6, the jet pump shell with the precoated sand mold core is cleaned in an ultrasonic cleaning device.
8. The one-shot injection molding method of a jet pump housing according to claim 1, characterized in that: and the jet pump shell with the precoated sand mold core in the S6 is subjected to sand blasting treatment by a small sand blasting machine.
CN202211019397.XA 2022-08-24 2022-08-24 One-time injection molding method of injection pump shell Pending CN115320026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211019397.XA CN115320026A (en) 2022-08-24 2022-08-24 One-time injection molding method of injection pump shell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211019397.XA CN115320026A (en) 2022-08-24 2022-08-24 One-time injection molding method of injection pump shell

Publications (1)

Publication Number Publication Date
CN115320026A true CN115320026A (en) 2022-11-11

Family

ID=83926515

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211019397.XA Pending CN115320026A (en) 2022-08-24 2022-08-24 One-time injection molding method of injection pump shell

Country Status (1)

Country Link
CN (1) CN115320026A (en)

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