CN118636381A - Forming method of formed parts containing metal and non-metal materials and pump flow-through component - Google Patents

Abstract

The present application relates to a molding method for a molded part containing metal and non-metallic materials and a pump flow component, and belongs to the field of molding process technology for molded parts. The molding method for a molded part containing metal and non-metallic materials includes: step S100: making a metal skeleton; step S200: setting a transition layer on the molding surface of the metal skeleton; step S300: putting the metal skeleton provided with the transition layer into a molding mold and injection molding to obtain a molded part; the transition layer is composed of M layers of transition material, and the transition material undergoes thermoplastic deformation at the injection molding temperature but does not flow: the innermost N layers of transition material are the first material, and the first material is in close contact with the molding surface; the outermost K layers of transition material are the second material; the L layers of transition material located between the first material and the second material are the third material. The molding method for a molded part containing metal and non-metallic materials provided in the embodiment of the present application can improve the strength of the molded part and extend the service life of the molded part.

Description

Forming method of formed parts containing metal and non-metal materials and pump flow-through component

Technical Field

The present application relates to the technical field of molded part molding technology, and in particular to a molding method for a molded part comprising metal and non-metallic materials and a pump flow component.

Background Art

Pump flow parts refer to the parts that are in direct contact with the conveyed medium during the operation of the pump. These parts vary in different types and applications of pumps. Conventional pump flow parts include:

The impeller is one of the core components of the pump. Its rotation allows the liquid to be sucked in and discharged. In the pump, the impeller mainly plays the role of increasing flow, increasing head and energy conversion.

The pump casing is the part that holds the pump components together and seals the liquid inside. Its main function is to convert the kinetic energy generated by the impeller into static pressure energy to output the liquid into the piping system. The shape and structure of the pump casing also vary depending on the type of pump.

Inlet and outlet flanges are the inlet and outlet joints of the pump, which connect the pipeline system and the pump. The connection methods of inlet and outlet flanges include threaded connection, flange connection, etc.

In conventional pump flow-through components, the corrosion resistance of the pump body made of metal materials is limited, while the structural strength of the pump body made of non-metallic materials is not high. In order to overcome the defects of the above materials, a pump body containing both metal and non-metallic materials has emerged. During the manufacturing process of such a pump body, due to the different thermal expansion coefficients of metal and non-metallic materials, stratification is likely to occur between the metal and non-metallic materials, resulting in a reduction in the strength of the final pump body. In addition, structural defects such as cracks, local deformation, and pores may occur in the metal material during the processing process, which will also lead to a reduction in the strength of the final pump body. Structural defects are prone to damage, affecting the service life of the pump body.

Summary of the invention

The purpose of the present application is to address the above-mentioned problems and to provide a molding method for a molded part comprising metal and non-metallic materials and a pump flow component, which can enhance the strength of the pump flow component, extend the service life of the pump flow component, and improve the above-mentioned problems.

This application is achieved through the following technical solutions:

In a first aspect, the present application provides a molding method for a molded part comprising metal and non-metal materials, and the molding method for a molded part comprising metal and non-metal materials comprises: step S100: making a metal skeleton; step S200: setting a transition layer on the molding surface of the metal skeleton; step S300: placing the metal skeleton provided with the transition layer into a molding mold and injection molding to obtain a molded part; wherein the molding surface is the surface of the metal skeleton in contact with the molding liquid through the transition layer; the transition layer is composed of M layers of transition material, and the transition material undergoes thermoplastic deformation at the injection molding temperature but does not flow, M≥3: the innermost N layers of transition material are the first material, the first material has thermal stability, M＞N≥1, and the first material is in close contact with the molding surface; the outermost K layers of transition material are the second material, the second material has elasticity, M＞K≥1; the L layers of transition material located between the first material and the second material are the third material, the third material has thermal conductivity, M＞L≥1, N+K+L≤M.

In the technical solution of the embodiment of the present application, in step S200, a transition layer is set on the molding surface of the metal skeleton, and the transition layer is composed of M layers of transition material. The transition material undergoes thermoplastic deformation at the injection molding temperature but does not flow, M≥3. When the molding liquid is injected, the metal skeleton absorbs the heat of the molding liquid and its own temperature rises to undergo thermal expansion. The transition material softens at the injection molding temperature and does not flow, so that the transition layer deforms with the volume expansion of the metal skeleton. During the cooling stage of the molding liquid, the metal skeleton shrinks in volume due to the decrease in its own temperature. The transition layer adheres to the molding surface of the metal skeleton and maintains close contact. The transition layer deforms with the volume expansion of the metal skeleton. The transition layer shrinks and deforms synchronously, and at the same time, there is good adhesion between the transition layer and the molded body formed after the molding liquid is cooled, so that the transition layer can fill the gap left by the shrinkage of the metal skeleton after deformation, so that the metal skeleton and the molded body can be in close contact through the transition layer, reducing the risk of gaps between the metal material and the molded body, so that the molded parts made by this method have better integrity, higher strength and longer service life; the transition material will not flow, so that the transition material can always cover the molding surface of the metal skeleton during the molding process, reducing the probability of stratification between the two due to direct contact between the molding liquid and the metal skeleton during the cooling stage of the molding liquid. The innermost N-layer transition material is the first material, which has thermal stability and will only slightly soften at the injection molding temperature, thereby ensuring that the first material as the bottom layer of the transition layer can provide stable support without flowing during the injection molding process, M>N≥1; the outermost K-layer transition material is the second material, which has elasticity. The elasticity of the second material can provide good stress relief while maintaining stability during the injection molding process, M>K≥1; the L-layer transition material located between the first material and the second material is the third material, which has thermal conductivity. The third material can transfer the heat of the molding liquid to the metal skeleton evenly and quickly, so that all parts of the metal skeleton can be evenly heated up and then undergo overall thermal expansion, reducing stress concentration, and then making the size of the metal skeleton shrink to be similar at various places during the cooling stage of the molding liquid, reducing the risk of gaps between the metal skeleton and the molded body due to the large local shrinkage rate of the metal skeleton, M>L≥1, N+K+L≤M, and the transition layer includes at least one layer of the first material, one layer of the second material and one layer of the third material. In step S300, a metal skeleton provided with a transition layer is placed in a molding mold and injection molded to obtain a molded part. By combining the metal skeleton with the molding liquid, the rigid support provided by the metal skeleton is used to improve the overall strength of the molded part, so that the molding liquid can be closely attached to the molding surface of the metal skeleton under high temperature and high pressure. This combination method reduces the internal stress of the molded part, especially for large-sized molded parts, and significantly improves its tolerance and service life. The metal skeleton is generally manufactured by casting, cutting, welding, milling, etc. The metal skeleton is inevitably subject to structural defects such as cracks, local deformation, and pores due to the manufacturing process. This method compensates for the impact of these structural defects by encapsulating the metal skeleton through injection molding to obtain a molded part. The surface of the molded part is smooth and uniform, there are no cracks and pores inside the molded part, and the local deformation area can be encapsulated by the molded body, and the strength of the molded part is significantly improved.

In some embodiments, the thickness of the transition layer is H0, satisfying 4 mm ≥ H0 ≥ 2 mm.

In the technical solution of the embodiment of the present application, the thickness of the transition layer is H0, 4mm≥H0≥2mm. The deformation of the transition layer is sufficient to fill the gap between the metal skeleton and the molded body during thermal expansion and contraction, while its own volume is small, so that the amount of molding liquid that can be injected into the mold is increased, and the volume of the molded body is increased, thereby making the overall strength of the molded part higher.

In some embodiments, the first material is polytetrafluoroethylene, and the thickness dimension of the first material is H1, which satisfies 0.5 mm ≥ H1 ≥ 0.25 mm.

In the technical solution of the embodiment of the present application, the first material is polytetrafluoroethylene. Polytetrafluoroethylene (PTFE) has excellent thermal stability and a melting point of about 327°C, which is much higher than the injection molding temperature of general thermoplastic materials. Polytetrafluoroethylene will not flow at high temperatures, but will only soften slightly, thereby ensuring that the bottom layer as the transition layer can provide stable support without flowing during the injection molding process.

In some embodiments, the second material is silica gel, and the thickness dimension of the second material is H2, satisfying 1mm≥H2≥0.5mm.

In the technical solution of the embodiment of the present application, the second material is silicone with a thermal deformation temperature range of 150-250°C, and will soften slightly at the injection molding temperature, but will not flow. The elasticity and cushioning properties of silicone make it an ideal transition layer surface material, which provides good stress relief while maintaining stability during the injection molding process.

In some embodiments, when the second material is provided, an additional material is added to the second material, and the additional material is a carbon fiber reinforced plastic.

In the technical solution of the embodiment of the present application, when the second material is set, carbon fiber reinforced plastic is added to the second material, so that the second material becomes a composite material of silicone and CFRP particles/fibers. The CFRP particles or fibers are evenly distributed in the silicone, which can significantly improve the thermal conductivity of the transition layer without significantly changing the thermoplastic deformation characteristics of the silicone. The second material can transfer the heat of the molding liquid to the metal skeleton evenly and quickly, so that all parts of the metal skeleton can be evenly heated and then undergo overall thermal expansion, reducing stress concentration, and then making the size of the metal skeleton shrinking at all parts during the cooling stage of the molding liquid similar, reducing the risk of gaps between the metal skeleton and the molded body due to the large local shrinkage rate of the metal skeleton. The addition of CFRP particles or fibers will not change the basic properties of the silicone, so the composite material can still maintain thermoplastic deformation without flowing at the injection temperature.

In some embodiments, the proportion of the added material in the second material is D, satisfying 40%≥D≥20%.

In the technical solution of the embodiment of the present application, the proportion of the added material in the second material is D, 40% ≥ D ≥ 20%, so that the second material has good thermal conductivity and can provide good stress relief effect for the metal skeleton and the molded body during the injection molding process.

In some embodiments, when providing the second material including the added material, the second material is heat treated to enhance the performance of the second material.

In the technical solution of the embodiment of the present application, when the second material including the added material is set, the second material is a composite material made by mixing silicone and carbon fiber reinforced plastic. In order to improve the stability and performance of the second material, the second material needs to be heat treated at high temperature.

In some embodiments, the third material is carbon fiber reinforced plastic, and the thickness dimension of the second material is H3, satisfying 1.5 mm ≥ H3 ≥ 0.75 mm, and H1 + H2 + H3 ≤ H0.

In the technical solution of the embodiment of the present application, the third material is carbon fiber reinforced plastic, which is a composite of carbon fiber and thermosetting resin, and has a heat deformation temperature of more than 200° C. CFRP does not flow at the injection temperature, but its excellent thermal conductivity can effectively disperse heat and reduce stress concentration.

In some embodiments, when manufacturing the metal skeleton, a recessed portion and/or a raised portion are provided on the molding surface of the metal skeleton; wherein the transition layer is in close contact with the recessed portion and/or the raised portion.

In the technical solution of the embodiment of the present application, recessed portions and/or raised portions are arranged on the forming surface of the metal skeleton, and the transition layer is in close contact with the recessed portions and/or raised portions, thereby increasing the contact area between the metal skeleton and the transition layer and strengthening the connection strength between the transition layer and the metal skeleton.

In a second aspect, the present application provides a pump flow component, which is manufactured by the molding method of the first aspect for a molded part comprising metal and non-metal materials.

The present application provides a molding method for a molded part including metal and non-metal materials and a pump flow component. The beneficial effects of the present application are as follows:

The metal skeleton and the molded body can be in close contact through the transition layer, reducing the risk of gaps between the metal material and the molded body, so that the molded part made by this method has better integrity, higher strength and longer service life.

Reduce the probability of direct contact between the molding liquid and the metal skeleton causing stratification during the cooling stage of the molding liquid: the transition material will not flow, so that the transition material can always cover the molding surface of the metal skeleton during the molding process.

Reduce the local shrinkage rate of the metal skeleton: The third material has thermal conductivity and can transfer the heat of the molding liquid to the metal skeleton evenly and quickly, so that all parts of the metal skeleton 1 can be evenly heated up and then undergo overall thermal expansion, reducing stress concentration, thereby making the shrinkage size of each part of the metal skeleton similar during the molding liquid cooling stage.

Reduce the internal stress of the molded part: By combining the metal skeleton with the molding liquid, the rigid support provided by the metal skeleton is used to improve the overall strength of the molded part, so that the molding liquid can fit tightly on the molding surface of the metal skeleton under high temperature and high pressure.

Improving the strength of molded parts: This method uses injection molding to cover the metal frame to obtain a molded part, thereby compensating for the impact of the structural defects of the metal frame.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a flow chart of a molding method of a molded part including metal and non-metal materials provided in some embodiments of the present application;

FIG2 is a schematic cross-sectional view of a molded part made by a molding method for a molded part comprising metal and non-metal materials provided in some embodiments of the present application;

FIG3 is a schematic diagram of the structure of a metal skeleton provided in some embodiments of the present application;

FIG4 is a front view of a metal skeleton provided in some embodiments of the present application;

FIG5 is a schematic diagram of the structure of a pump flow component provided in some embodiments of the present application;

FIG. 6 is a front view of a pump flow component provided in some embodiments of the present application.

Icon: 1-metal skeleton; 10-molding surface; 100-recessed part; 101-raised part; 2-transition layer; 20-first material; 21-second material; 22-third material; 3-pump flow component; 4-molded body.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

The term "multiple" as used in the present application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

The inventors noticed that in the molding process of a molded part containing both metal materials and non-metallic materials, the metal material is used as the skeleton, and the non-metallic material is injection molded on the surface of the metal material. Taking the processing method of molding a molded part as an example, due to the different expansion coefficients of metal materials and non-metallic materials, the temperature of the molding liquid during injection molding is relatively high. When the molding liquid is injected into the mold, the molding liquid covers the metal skeleton. The temperature of the molding liquid is higher than the temperature of the metal skeleton, thereby driving the temperature of the metal skeleton to rise. The volume of the metal skeleton is proportional to the temperature, causing the volume of the metal skeleton to increase. The molding liquid fills the molding mold. During the cooling and solidification of the molding liquid, the temperature of the molding liquid and the metal skeleton gradually decreases, the volume of the metal skeleton decreases, and the fluidity of the molding liquid gradually weakens until it solidifies. The metal skeleton and the molded body formed by the solidification of the molding liquid are gradually separated, resulting in a stratification problem, which ultimately leads to gaps inside the molded part. The strength of the molded part is low, and the part with gaps in the molded part is easily damaged, affecting the service life of the molded part.

Based on the above considerations, in order to solve the problem that the voids inside the molded parts containing metal materials and non-metallic materials lead to low strength and affect the service life, the inventors have designed a molding method for molded parts containing metal materials and non-metallic materials after in-depth research. A transition layer is set on the metal skeleton and then injection molding is performed. The transition layer undergoes thermoplastic deformation at the injection temperature but does not flow. The transition layer is in close contact with the molding surface of the metal skeleton. In the process of gradual cooling of the molding liquid, the metal skeleton and the molded body formed by the solidification of the molding liquid can be kept in contact through the transition layer through the deformation of the transition layer, thereby reducing the probability of delamination problems between the metal material and the molded body, improving the integrity of the manufactured molded parts, thereby improving the strength of the molded parts, reducing the risk of damage to local areas of the molded parts, and extending the service life of the molded parts.

The molding method of the molded part including metal material and non-metal material provided in the present application can be applied to the production process of various molded parts including metal material and non-metal material, which is conducive to improving the strength and service life of the molded parts. The present application is described by taking the production of pump flow components as an example.

According to some embodiments of the present application, optionally, as shown in FIGS. 1 to 4 , the present application provides a method for forming a molded part comprising metal and non-metal materials, and the method for forming a molded part comprising metal and non-metal materials includes:

Step S100: making a metal frame 1;

Step S200: providing a transition layer 2 on the molding surface 10 of the metal skeleton 1;

Step S300: placing the metal skeleton 1 provided with the transition layer 2 into a molding mold and performing injection molding to obtain a molded part;

The molding surface 10 is the surface of the metal skeleton 1 in contact with the molding liquid through the transition layer 2;

The transition layer 2 is composed of M layers of transition material, and the transition material undergoes thermoplastic deformation but does not flow at the injection temperature, M≥3;

The innermost N layers of transition material are the first material 20 , the first material 20 has thermal stability, M＞N≥1, and the first material 20 is in close contact with the molding surface 10 ;

The outermost K-layer transition material is the second material 21, and the second material 21 has elasticity, M＞K≥1;

The L-layer transition material between the first material 20 and the second material 21 is the third material 22 . The third material 22 has thermal conductivity, M＞L≥1, N+K+L≤M.

In step S100, the metal frame 1 is manufactured by precision casting technology. The precision casting enables the metal frame 1 to meet the required complex shape and high precision requirements.

Taking the impeller in the pump flow component 3 as an example, a plurality of through holes are provided on the metal skeleton 1 of the impeller blades. During the injection molding process, the molding liquid can pass through the through holes on the metal skeleton 1 of the blades to fill various places of the molding mold, and can pass through the through holes on the metal skeleton 1 of the blades to completely cover the metal skeleton 1 of the blades, thereby reducing the probability of the occurrence of filling dead corners in the molding; on the other hand, the provision of through holes can increase the contact area between the metal skeleton 1 and the molding liquid through the transition layer 2, so that the molding liquid can transfer its own heat to the metal skeleton 1 more quickly, so that various places of the metal skeleton 1 can be evenly heated up and then undergo overall thermal expansion, thereby making the size of the metal skeleton 1 shrink to a similar size at various places during the cooling stage of the molding liquid, thereby reducing the risk of gaps between the metal skeleton 1 and the molded body 4 due to the large local shrinkage rate of the metal skeleton 1;

Taking the metal skeleton 1 as an example, the expansion rate mentioned in the present application refers to the ratio between the volume of the metal skeleton 1 after thermal expansion and the volume of the metal skeleton 1 before thermal expansion;

Taking the metal skeleton 1 as an example, the shrinkage rate mentioned in the present application refers to the ratio between the volume of the metal skeleton 1 after thermal expansion and the volume of the metal skeleton 1 after the volume is reduced due to thermal expansion and contraction when the temperature drops;

Injection molding, also known as injection molding, is a molding method that combines injection and molding. At a certain temperature, the completely molten plastic material (i.e., molding liquid) is stirred by a screw, and then injected into the mold cavity (molding cavity of the molding mold) with high pressure. After cooling and solidification, the molded part is obtained. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods. The injection molding process can be roughly divided into six stages: mold closing, injection, pressure holding, cooling, mold opening, and product removal.

The molten molding liquid injected into the molding mold has a certain temperature, that is, the injection temperature. The specific injection temperature depends on the type of molding liquid used. For example: carbon fiber reinforced nylon (such as PA6-CF): injection temperature range: 280℃-300℃; acrylonitrile-styrene copolymer (AS): injection temperature range: 170℃-310℃; cellulose acetate (CA): injection temperature range: 170℃-265℃; ethylene-vinyl acetate copolymer (rubber) (EVA): injection temperature range: 150℃-180℃; polyethylene terephthalate (PET): injection temperature range: 265℃-295℃; polyethylene (PE): injection temperature range: 150℃-300℃; polyphenylene ether ether ketone (polyether ketone) (PEEK): injection temperature range: 151℃-300℃.

In step S200, a transition layer 2 is provided on the molding surface 10 of the metal skeleton 1. The transition layer 2 is composed of M layers of transition material. The transition material undergoes thermoplastic deformation at the injection molding temperature but does not flow. M≥3. When the molding liquid is injected, the metal skeleton 1 absorbs the heat of the molding liquid and its own temperature rises and undergoes thermal expansion. The transition material softens at the injection molding temperature and does not flow, so that the transition layer 2 deforms with the volume expansion of the metal skeleton 1. During the cooling stage of the molding liquid, the metal skeleton 1 shrinks in volume due to its own temperature reduction. The transition layer 2 adheres to the molding surface 10 of the metal skeleton 1 and maintains close contact. The transition layer 2 shrinks synchronously with the shrinkage of the metal skeleton 1. Deformation, at the same time, there is good adhesion between the transition layer 2 and the molded body 4 formed after the molding liquid is cooled, so that the transition layer 2 can fill the gap left after the metal skeleton 1 shrinks after deformation, so that the metal skeleton 1 and the molded body 4 can be in close contact through the transition layer 2, reducing the risk of gaps between the metal material and the molded body 4, so that the molded parts made by this method have better integrity, higher strength and longer service life; the transition material will not flow, so that the transition material can always cover the molding surface 10 of the metal skeleton 1 during the molding process, reducing the probability of direct contact between the molding liquid and the metal skeleton 1 causing stratification between the two during the cooling stage of the molding liquid.

The innermost N layers of transition material are the first material 20. The first material 20 has thermal stability and will only be slightly softened at the injection molding temperature, thereby ensuring that the first material 20 as the bottom layer of the transition layer 2 can provide stable support without flowing during the injection molding process, M＞N≥1;

The outermost K-layer transition material is the second material 21. The second material 21 is elastic. The elasticity of the second material 21 can provide a good stress relief effect while maintaining stability during the injection molding process. M＞K≥1;

The L-layer transition material between the first material 20 and the second material 21 is the third material 22. The third material 22 has thermal conductivity. The third material 22 can transfer the heat of the molding liquid to the metal skeleton 1 evenly and quickly, so that all parts of the metal skeleton 1 can be evenly heated up and then undergo overall thermal expansion, reducing stress concentration, thereby making the metal skeleton 1 shrink to similar sizes at various locations during the molding liquid cooling stage, reducing the risk of gaps between the metal skeleton 1 and the molded body 4 due to the large local shrinkage rate of the metal skeleton 1, M＞L≥1, N+K+L≤M, and the transition layer 2 includes at least one layer of the first material 20, one layer of the second material 21 and one layer of the third material 22.

In step S300, the metal skeleton 1 provided with the transition layer 2 is placed in a molding mold and injection molded to obtain a molded part. The metal skeleton 1 is combined with the molding liquid and the rigid support provided by the metal skeleton 1 is utilized to improve the overall strength of the molded part. The molding liquid can fit tightly on the molding surface 10 of the metal skeleton 1 under high temperature and high pressure. This combination method reduces the internal stress of the molded part, especially for large-sized molded parts, and significantly improves its tolerance and service life.

The metal skeleton 1 is generally manufactured by casting, cutting, welding, milling, etc. The metal skeleton 1 inevitably has structural defects such as cracks, local deformation, and pores due to the manufacturing process. This method compensates for the impact of these structural defects by encapsulating the metal skeleton 1 through injection molding to obtain a molded part. The surface of the molded part is smooth and uniform, there are no cracks and pores inside the molded part, and the local deformation area can be encapsulated by the molded body 4, and the strength of the molded part is significantly improved.

According to some embodiments of the present application, optionally, as shown in FIG. 2 , the thickness of the transition layer 2 is H0, satisfying 4 mm ≥ H0 ≥ 2 mm.

H0 can be, but is not limited to, 2mm, 2.5mm, 3mm, 3.5mm and 4mm.

When H0 is less than 2 mm, the deformation of the transition layer 2 is small, and it is difficult to fill the gap between the metal skeleton 1 and the non-metallic material due to thermal expansion and contraction during the cooling process of the molding liquid, resulting in gaps inside the molded part, reducing the strength of the molded part.

When H0＞4mm, since the volume of the molded part is fixed, the volume of the transition layer 2 is larger, resulting in a smaller volume of the molded body 4. The strength of the transition layer 2 is much smaller than that of the molded body 4, resulting in lower overall strength of the molded part.

The thickness of the transition layer 2 is H0, 4mm≥H0≥2mm. The deformation of the transition layer 2 is sufficient to fill the gap between the metal skeleton 1 and the molded body 4 during thermal expansion and contraction, while its own volume is small, so that the amount of molding liquid that can be injected into the mold is increased, and the volume of the molded body 4 is increased, thereby making the overall strength of the molded part higher.

According to some embodiments of the present application, optionally, as shown in FIG. 2 , the first material 20 is polytetrafluoroethylene, and the thickness dimension of the first material 20 is H1, satisfying 0.5 mm ≥ H1 ≥ 0.25 mm.

Polytetrafluoroethylene, also known as Teflon, commonly known as the "King of Plastics", is a high molecular polymer made by polymerizing tetrafluoroethylene as a monomer. Its chemical formula is (C2F4)n. It has excellent heat and cold resistance and can be used for a long time at -180 to 260°C. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents.

The first material 20 is polytetrafluoroethylene. Polytetrafluoroethylene (PTFE) has excellent thermal stability and a melting point of about 327°C, which is much higher than the injection molding temperature of general thermoplastic materials. Polytetrafluoroethylene will not flow at high temperatures, but will only soften slightly, thereby ensuring that it can provide stable support as the bottom layer of the transition layer 2 during the injection molding process without flowing.

According to some embodiments of the present application, optionally, as shown in FIG. 2 , the second material 21 is silica gel, and the thickness dimension of the second material 21 is H2, satisfying 1 mm ≥ H2 ≥ 0.5 mm.

Silica gel, also known as silica gel, is a highly active adsorption material and an amorphous substance with good viscosity, hardness, tensile strength, tear strength and elasticity.

The second material 21 is silicone with a heat deformation temperature range of 150-250°C. It will soften slightly at the injection temperature but will not flow. The elasticity and cushioning properties of silicone make it an ideal surface material for the transition layer 2, which can maintain stability during the injection process while providing good stress relief effects.

According to some embodiments of the present application, optionally, when setting the second material 21, an additional material is added to the second material 21, and the additional material is carbon fiber reinforced plastic.

The carbon fiber reinforced plastic may be in a granular or fibrous form and arranged in the second material 21 .

When setting the second material 21, carbon fiber reinforced plastic is added to the second material 21, so that the second material 21 becomes a composite material of silicone and CFRP particles/fibers. The CFRP particles or fibers are evenly distributed in the silicone, which can significantly improve the thermal conductivity of the transition layer 2 without significantly changing the thermoplastic deformation characteristics of the silicone. The second material 21 can evenly and quickly transfer the heat of the molding liquid to the metal skeleton 1, so that all parts of the metal skeleton 1 can be evenly heated and then undergo overall thermal expansion, reducing stress concentration, and thus making the size of the metal skeleton 1 shrink to a similar size at all parts during the cooling stage of the molding liquid, reducing the risk of gaps between the metal skeleton 1 and the molded body 4 due to the large local shrinkage rate of the metal skeleton 1. The addition of CFRP particles or fibers will not change the basic properties of the silicone, so the composite material can still maintain thermoplastic deformation without flowing at the injection temperature.

According to some embodiments of the present application, optionally, the proportion of the added material in the second material 21 is D, satisfying 40% ≥ D ≥ 20%.

When D>40%, the content of silica gel is low, and the elasticity and buffering performance of the second material 21 are difficult to relieve the stress generated by the thermal expansion and contraction deformation of the metal skeleton 1 and the molded body 4 during the injection molding process;

When D is less than 20%, the content of the carbon fiber reinforced plastic is relatively low, and the effect of improving the thermal conductivity of the second material 21 is relatively poor.

The proportion of the added material in the second material 21 is D, 40% ≥ D ≥ 20%, so that the second material 21 has good thermal conductivity and can provide good stress relief effect for the metal skeleton 1 and the molded body 4 during the injection molding process.

According to some embodiments of the present application, optionally, when providing the second material 21 including the added material, the second material 21 is heat treated to improve the performance of the second material 21 .

When the second material 21 including the additive material is provided, the second material 21 is a composite material made by mixing silica gel and carbon fiber reinforced plastic. To improve the stability and performance of the second material 21, the second material 21 needs to be heat treated at a high temperature.

According to some embodiments of the present application, optionally, as shown in FIG. 2 , the third material 22 is carbon fiber reinforced plastic, and the thickness dimension of the second material 21 is H3, satisfying 1.5 mm ≥ H3 ≥ 0.75 mm, and H1 + H2 + H3 ≤ H0.

Carbon fiber reinforced plastic is a composite material composed of matrix resin and carbon fiber. Carbon fiber is made of viscose, polyacrylonitrile and asphalt fibers, etc., and is carbonized at 300-1000°C. It has good strength, elasticity, fatigue resistance, wear resistance, thermal conductivity, heat resistance, vibration resistance and other characteristics.

The third material 22 is carbon fiber reinforced plastic, which is a composite of carbon fiber and thermosetting resin, and has a heat deformation temperature of more than 200° C. CFRP does not flow at the injection temperature, but its excellent thermal conductivity can effectively disperse heat and reduce stress concentration.

According to some embodiments of the present application, optionally, as shown in FIG. 2 , when manufacturing the metal skeleton 1 , a recessed portion 100 and/or a raised portion 101 are provided on the molding surface 10 of the metal skeleton 1 ; wherein the transition layer 2 is in close contact with the recessed portion 100 and/or the raised portion 101 .

When the molding surface 10 is provided with a plurality of recessed portions 100 and raised portions 101 , the recessed portions 100 and raised portions 101 are alternately arranged.

A recessed portion 100 and/or raised portion 101 is provided on the forming surface 10 of the metal skeleton 1, and the transition layer 2 is in close contact with the recessed portion 100 and/or raised portion 101, thereby increasing the contact area between the metal skeleton 1 and the transition layer 2 and strengthening the connection strength between the transition layer 2 and the metal skeleton 1.

According to some embodiments of the present application, optionally, as shown in FIGS. 3 to 6 , the present application provides a pump flow component 3 , which is manufactured by the above-mentioned molding method of a molded part including metal and non-metal materials.

The pump flow component provided in this embodiment has all the advantages mentioned above, which will not be described in detail here.

Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A method for forming a molded part comprising metal and non-metal materials, characterized by comprising: Step S100: making a metal frame; Step S200: providing a transition layer on the molding surface of the metal skeleton; Step S300: placing a metal skeleton provided with a transition layer into a molding mold and performing injection molding to obtain a molded part; Wherein, the molding surface is the surface of the metal skeleton in contact with the molding liquid through the transition layer; The transition layer is composed of M layers of transition material, and the transition material undergoes thermoplastic deformation but does not flow at the injection temperature, and M≥3; The innermost N layers of transition material are first materials, the first materials have thermal stability, M＞N≥1, and the first materials are in close contact with the molding surface; The transition material of the outermost K layer is the second material, and the second material has elasticity, M＞K≥1; The transition material in the L layer between the first material and the second material is a third material, and the third material has thermal conductivity, M＞L≥1, N+K+L≤M. 2. The forming method of a formed part comprising metal and non-metal materials according to claim 1, characterized in that the thickness of the transition layer is H0, satisfying 4mm≥H0≥2mm. 3. The method for forming a molded part comprising metal and non-metal materials according to claim 1, characterized in that the first material is polytetrafluoroethylene, and the thickness dimension of the first material is H1, which satisfies 0.5mm≥H1≥0.25mm. 4. The molding method of a molded part comprising metal and non-metal materials according to claim 1, characterized in that the second material is silicone, and the thickness dimension of the second material is H2, satisfying 1mm≥H2≥0.5mm. 5. The molding method of a molded part comprising metal and non-metal materials according to claim 4, characterized in that when the second material is provided, an additional material is added to the second material, and the additional material is carbon fiber reinforced plastic. 6. The method for forming a molded part comprising metal and non-metal materials according to claim 5, characterized in that the proportion of the added material in the second material is D, which satisfies 40% ≥ D ≥ 20%. 7. The method for forming a molded part comprising metal and non-metal materials according to claim 6, characterized in that when the second material comprising an added material is provided, the second material is heat treated to improve the performance of the second material. 8. The method for forming a molded part comprising metal and non-metal materials according to claim 1, characterized in that the third material is carbon fiber reinforced plastic, and the thickness dimension of the second material is H3, satisfying 1.5 mm ≥ H3 ≥ 0.75 mm. 9. The molding method of a molded part comprising metal and non-metal materials according to claim 1, characterized in that when manufacturing a metal skeleton, a recessed portion and/or a raised portion is provided on the molding surface of the metal skeleton; Wherein, the transition layer is in close contact with the recessed portion and/or the raised portion. 10. A pump flow component, characterized in that it is made by using the molding method of a molded part comprising metal and non-metal materials as described in any one of claims 1 to 9.