High-glass-fiber halogen-free injection molding machine screw rocket head and preparation method thereof

Abstract

The invention discloses a high glass fiber halogen-free injection molding machine screw rocket head and a preparation method thereof, and particularly relates to the technical field of rocket head preparation, the high glass fiber halogen-free injection molding machine screw rocket head is jointly manufactured by die steel and metal ceramic, a metal ceramic block is welded to the tail feather part of the die steel rocket head, and the metal ceramic is Ni-Mo2NiB2. The rocket head is manufactured through combination of die steel and metal ceramic, the metal boride ceramic alloy is inlaid in the tail feather part of the rocket head, and the metallographic structure of the ceramic coating is Ni-based solid solution + Mo2NiB2 ceramic, so that the surface corrosion resistance and wear resistance of the injection molding machine rocket head are synchronously improved, and compared with a rocket head made of a high-speed steel material, the service life of the injection molding machine rocket head is prolonged. The service life of the rocket head can be prolonged by 5-10 times in a high-glass-fiber halogen-free injection molding environment, and the defect that the service life of the high-glass-fiber halogen-free injection molding rocket head is short is well overcome.

Description

Technical Field

[0001] The invention relates to the technical field of rocket heads, and more specifically to a high-glass-fiber halogen-free injection molding machine screw rocket head and a preparation method thereof. Background Art

[0002] High glass fiber halogen-free plastic injection molding machine refers to injection molding equipment specially used for processing high-content glass fiber reinforced and halogen-free flame-retardant plastics. Such materials usually have high strength, high rigidity, good heat resistance and excellent flame retardant properties, and are suitable for high-end applications in the fields of electronics, automobiles, aerospace, etc. When processing these materials, the injection molding machine needs to be able to adapt to the high viscosity and thermal sensitivity of the materials to ensure the quality and performance of the products.

[0003] The high-glass fiber halogen-free plastic injection molding machine screw rocket head parts are responsible for the functions of sealing, mixing and plasticizing, and are subjected to high wear, high corrosion and high impact conditions. The life of the rocket head is very short. The material of the rocket head parts needs to meet harsh conditions such as high strength, high impact toughness, high corrosion resistance and high wear resistance. Traditional plastic mold steel, stainless steel, nickel-based alloys, etc. have certain corrosion resistance and severe wear; high-speed steel, powder steel, etc. have higher wear resistance and severe corrosion. It is difficult for existing technologies to meet high corrosion resistance and high wear resistance at the same time. Therefore, the present invention proposes a high-glass fiber halogen-free injection molding machine screw rocket head with high corrosion resistance and high wear resistance and a preparation method thereof. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-glass fiber halogen-free injection molding machine screw rocket head and a preparation method thereof. The rocket head is manufactured by jointly using mold steel and metal ceramics, so that the surface corrosion resistance and wear resistance of the rocket head are simultaneously improved, thereby effectively solving the problem of short service life of high-glass fiber halogen-free injection molding rocket heads.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-glass fiber halogen-free injection molding machine screw rocket head, which is jointly manufactured by mold steel and metal ceramics, and the metal ceramic block is welded to the tail feather part of the mold steel rocket head.

[0006] Preferably, the mold steel is a plastic mold steel such as 3Cr13, 4Cr13, 3Cr2Mo, 3Cr17Mo, 4Cr2Mn1MoS, or a hot working mold steel such as 5CrNiMo, 4CrMnSiMoV, 4Cr5MoSiV1.

[0007] Preferably, the metal ceramic is Ni-Mo2NiB2, and the composition of the metal ceramic includes 30.5-34.5% Mo, 2.5-3.5% B, 2.0-11.5% Cr, 0.5-6.5% V, and the remainder Ni in percentage.

[0008] The present invention also includes a method for preparing a high-glass fiber halogen-free injection molding machine screw rocket head, comprising the following steps:

[0009] Step S1: The mold steel is machined and heat treated to the designed size;

[0010] Step S2, cutting the metal ceramic into designed size after forming;

[0011] Step S3, using induction heating to weld the metal ceramic block to the tail feather part of the die steel rocket head, and then grinding and polishing to form it.

[0012] Preferably, the preparation steps of the metal ceramic are:

[0013] H1: Molybdenum powder, nickel powder, boron powder and binary boride powder are mixed by ball milling and pressed into blocks by cold isostatic pressing or press molding;

[0014] H2, negative pressure degreasing: temperature is 150-850℃, divided into 2-4 levels of insulation, each level of insulation time is 30-60min, the heating rate is 2-9℃ / min, the protective atmosphere is nitrogen, and the gas flow rate is 20-40L / min;

[0015] H3, vacuum sintering: temperature is 900-1100℃, sintering time is 30-60min;

[0016] H4, partial pressure sintering: temperature is 1200-1350℃, sintering time is 80-200min, protective atmosphere is argon, gas pressure is 20-30KPa, gas flow rate is 30-60L / min;

[0017] H5, Cooling: Pass 60-90kpa high pressure argon gas and cool at a speed of 5-10℃ / min.

[0018] Preferably, in step S3, the specific method of induction heating is: align the clean metal ceramic block with the clean mold steel rocket head tail feather part, turn on the induction heating device, and apply pressure at the same time to tightly combine the metal ceramic block and the rocket head tail feather part to complete the high glass fiber halogen-free injection molding machine screw rocket head welding molding; the induction heating frequency is 75-200kHz, the power is 2-35KW, the voltage is 6-12V, the current is 70-200A, the pressure is 0.5-0.7Mpa, and the induction welding time is 3-8s.

[0019] The induction heating device works on the principle of electromagnetic induction. When an alternating current passes through the induction coil, a changing magnetic field is generated inside the coil. If a conductive material (such as a metal workpiece) is placed in this magnetic field, the alternating magnetic field will generate an induced current (eddy current) inside the metal. When these eddy currents flow inside the metal, due to the resistance of the metal, the electrical energy is converted into thermal energy, thereby rapidly heating the metal workpiece. The induction heating device has the advantages of high efficiency, rapid heating, uniform heating, precise control of heating temperature and time, environmental protection and energy saving. Since the heating is directly generated inside the material, selective heating can be achieved, energy consumption is reduced, and the workpiece deformation is small. In addition, direct contact with open flames is not required during induction heating, which improves product quality and operational safety.

[0020] Preferably, metal antioxidants are added during welding to improve the welding effect and prevent the welding interface from oxidizing before welding. Metal antioxidants are substances used to slow down or prevent metal oxidation. During the oxidation process, metals react with oxygen molecules in their environment to form metal oxides. This process may cause metal properties to deteriorate, such as weakened strength and poor corrosion resistance. The role of antioxidants is to inhibit this oxidation process through various chemical reactions, thereby protecting metal materials and extending their service life. Metal antioxidants are mainly ethyl cellulose, liquefied phenolic resin, etc.

[0021] Technical effects and advantages of the present invention:

[0022] The high-glass fiber halogen-free injection molding machine screw rocket head of the present invention is jointly manufactured from mold steel and metal ceramics. By inlaying a metal boride ceramic alloy on the tail feather part of the rocket head, the metallographic structure of the ceramic coating is Ni-based solid solution + Mo2NiB2 ceramic, so that the surface corrosion resistance and wear resistance of the injection molding machine rocket head are simultaneously improved. Compared with the rocket head made of high-speed steel material, the service life will be increased by 5-10 times in the high-glass fiber halogen-free injection molding environment, which well solves the problem of short service life of the high-glass fiber halogen-free injection molding rocket head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the screw rod rocket head of the high glass fiber halogen-free injection molding machine of the present invention;

[0024] Figure 2 This is a metallographic structure diagram of the screw and rocket head bonding interface of the high glass fiber halogen-free injection molding machine of the present invention;

[0025] Figure 3 This is the interface hardness distribution diagram of the mold steel + metal ceramic of the present invention.

[0026] The accompanying drawings are marked as follows: 1. die steel rocket head; 2. metal ceramic block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides Figure 1 The high-glass fiber halogen-free injection molding machine screw rocket head shown is jointly manufactured by mold steel and metal ceramics, and the metal ceramic block 2 is welded to the tail feather part of the mold steel rocket head 1.

[0030] Specifically, the mold steel is plastic mold steel;

[0031] The metal ceramic is Ni-Mo2NiB2, and the preparation steps of the metal ceramic are:

[0032] H1: Molybdenum powder, nickel powder, boron powder and binary boride powder are mixed by ball milling and pressed into blocks by cold isostatic pressing;

[0033] H2, negative pressure degreasing: temperature is 150℃, divided into 2 levels of insulation, each level of insulation time is 30min, heating rate is 2℃ / min, protective atmosphere is nitrogen, gas flow rate is 20L / min;

[0034] H3, vacuum sintering: temperature is 900℃, sintering time is 30min;

[0035] H4, partial pressure sintering: temperature is 1200℃, sintering time is 80min, protective atmosphere is argon, gas pressure is 20KPa, gas flow rate is 30L / min;

[0036] H5, Cooling: Pass 60kPa high pressure argon gas and cool at a rate of 5℃ / min.

[0037] The composition of the metal ceramic includes 34.5% Mo, 3.5% B, 2.0% Cr, 0.5% V, and the rest Ni in percentage. The hardness of the Ni-Mo2NiB2 metal ceramic in this embodiment is HV750.

[0038] This embodiment also provides a method for preparing the above-mentioned rocket head, comprising the following steps:

[0039] Step S1: The mold steel is machined and heat treated to the designed size;

[0040] Step S2, cutting the metal ceramic into designed size after forming;

[0041] Step S3, align the clean metal ceramic block 2 with the tail feather part of the clean mold steel rocket head 1, turn on the induction heating device, and apply pressure at the same time to tightly combine the metal ceramic block 2 and the tail feather part of the mold steel rocket head 1, with an induction heating frequency of 75kHz, a power of 2KW, a voltage of 6V, a current of 70A, a pressure of 0.5Mpa, and an induction welding time of 3s to complete the welding of the high glass fiber halogen-free injection molding machine screw rocket head; in order to improve the welding effect and prevent the welding interface from oxidizing before welding, a small amount of ethyl cellulose is added during the welding process, and finally the molding is performed by grinding and polishing.

[0042] Example 2

[0043] This embodiment provides Figure 1 The high-glass fiber halogen-free injection molding machine screw rocket head shown is jointly manufactured by mold steel and metal ceramics, and the metal ceramic block 2 is welded to the tail feather part of the mold steel rocket head 1.

[0044] Specifically, the mold steel is plastic mold steel;

[0045] The metal ceramic is Ni-Mo2NiB2, and the preparation steps of the metal ceramic are:

[0046] H1: Molybdenum powder, nickel powder, boron powder and binary boride powder are mixed by ball milling and pressed into blocks by cold isostatic pressing or press molding;

[0047] H2, negative pressure degreasing: temperature is 500℃, divided into 3 levels of insulation, each level of insulation time is 40min, heating rate is 5℃ / min, protective atmosphere is nitrogen, gas flow rate is 45L / min;

[0048] H3, vacuum sintering: temperature is 1000℃, sintering time is 50min;

[0049] H4, partial pressure sintering: temperature is 1300℃, sintering time is 140min, protective atmosphere is argon, gas pressure is 25KPa, gas flow rate is 45L / min;

[0050] H5, Cooling: Pass 75kpa high pressure argon gas and cool at a rate of 6℃ / min.

[0051] The composition of the metal ceramic includes 30.5% Mo, 3.0% B, 8.0% Cr, 2.5% V, and the rest Ni in percentage. The hardness of the Ni-Mo2NiB2 metal ceramic in this embodiment is HV800.

[0052] This embodiment also provides a method for preparing the above-mentioned rocket head, comprising the following steps:

[0053] Step S1: The mold steel is machined and heat treated to the designed size;

[0054] Step S2, cutting the metal ceramic into designed size after forming;

[0055] Step S3, align the clean metal ceramic block 2 with the clean tail feather part of the mold steel rocket head 1, turn on the induction heating device, and apply pressure at the same time to tightly combine the metal ceramic block 2 and the tail feather part of the mold steel rocket head 1. The induction heating frequency is 140kHz, the power is 18KW, the voltage is 9V, the current is 140A, the pressure is 0.6Mpa, and the induction welding time is 5s to complete the welding of the high glass fiber halogen-free injection molding machine screw rocket head; in order to improve the welding effect and prevent the welding interface from oxidizing before welding during the welding process, a small amount of liquefied phenolic resin is added, and finally it is formed by grinding and polishing.

[0056] Example 3

[0057] This embodiment provides Figure 1 The high-glass fiber halogen-free injection molding machine screw rocket head shown is jointly manufactured by mold steel and metal ceramics, and the metal ceramic block 2 is welded to the tail feather part of the mold steel rocket head 1.

[0058] Specifically, the die steel is hot working die steel;

[0059] The metal ceramic is Ni-Mo2NiB2, and the preparation steps of the metal ceramic are:

[0060] H1: Molybdenum powder, nickel powder, boron powder and binary boride powder are mixed by ball milling and pressed into blocks by cold isostatic pressing or press molding;

[0061] H2, negative pressure degreasing: temperature is 850℃, divided into 4 levels of insulation, each level of insulation time is 60min, heating rate is 9℃ / min, protective atmosphere is nitrogen, gas flow rate is 40L / min;

[0062] H3, vacuum sintering: temperature is 1100℃, sintering time is 60min;

[0063] H4, partial pressure sintering: temperature is 1350℃, sintering time is 200min, protective atmosphere is argon, gas pressure is 30KPa, gas flow rate is 60L / min;

[0064] H5, Cooling: Pass 90kPa high pressure argon gas and cool at a rate of 10℃ / min.

[0065] The composition of the metal ceramic includes 33.5% Mo, 3.5% B, 11.5% Cr, 6.5% V, and the rest Ni in percentage. The hardness of the Ni-Mo2NiB2 metal ceramic in this embodiment is HV820.

[0066] This embodiment also provides a method for preparing the above-mentioned rocket head, comprising the following steps:

[0067] Step S1: The mold steel is machined and heat treated to the designed size;

[0068] Step S2, cutting the metal ceramic into designed size after forming;

[0069] Step S3, align the clean metal ceramic block 2 with the clean tail feather part of the mold steel rocket head 1, turn on the induction heating device, and apply pressure at the same time to tightly combine the metal ceramic block 2 and the tail feather part of the mold steel rocket head 1. The induction heating frequency is 200kHz, the power is 35KW, the voltage is 12V, the current is 200A, the pressure is 0.7Mpa, and the induction welding time is 8s to complete the welding of the high glass fiber halogen-free injection molding machine screw rocket head; in order to improve the welding effect and prevent the welding interface from oxidizing before welding, a small amount of ethyl cellulose is added during the welding process, and finally it is formed by grinding and polishing.

[0070] like Figure 2 As shown in the figure, it is the metallographic structure diagram of the rocket head interface made by mold steel + metal ceramic induction welding. The metal ceramic is Mo2NiB2 white ceramic phase evenly distributed on the Ni-based solid solution, and there is a transition layer between stainless steel and metal ceramic; Figure 3 As shown, it is the interface hardness distribution of mold steel + metal ceramic. The hardness of Ni-Mo2NiB2 metal ceramic is HV750-850.

[0071] The surface corrosion resistance and wear resistance of the injection molding machine rocket head are improved simultaneously. Compared with the rocket head made of high-speed steel, the service life will be increased by 5-10 times in the high-glass fiber halogen-free injection molding environment, which can well solve the problem of short service life of the high-glass fiber halogen-free injection molding rocket head.

[0072] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high glass fiber halogen-free injection molding machine screw rocket head, characterized in that: It is made of die steel and metal ceramics, and the metal ceramic block is welded to the tail feather part of the die steel rocket head.

2. The high glass fiber halogen-free injection molding machine screw rocket head according to claim 1, characterized in that: The mold steel is plastic mold steel or hot working mold steel.

3. The high glass fiber halogen-free injection molding machine screw rocket head according to claim 1, characterized in that: The metal ceramic is Ni-Mo2NiB2, and the composition of the metal ceramic includes 30.5-34.5% Mo, 2.5-3.5% B, 2.0-11.5% Cr, 0.5-6.5% V, and the remainder Ni in percentage.

4. The method for preparing the high glass fiber halogen-free injection molding machine screw rocket head according to claim 3, characterized in that: The steps include: Step S1: The mold steel is machined and heat treated to the designed size; Step S2, cutting the metal ceramic into designed size after forming; Step S3, using induction heating to weld the metal ceramic block to the tail feather part of the die steel rocket head, and then grinding and polishing to form it.

5. The method for preparing the high glass fiber halogen-free injection molding machine screw rocket head according to claim 4, characterized in that: The preparation steps of metal ceramics are: H1: Molybdenum powder, nickel powder, boron powder and binary boride powder are mixed by ball milling and pressed into blocks by cold isostatic pressing or press molding; H2, negative pressure degreasing: temperature is 150-850℃, divided into 2-4 levels of insulation, each level of insulation time is 30-60min, the heating rate is 2-9℃ / min, the protective atmosphere is nitrogen, and the gas flow rate is 20-40L / min; H3, vacuum sintering: temperature is 900-1100℃, sintering time is 30-60min; H4, partial pressure sintering: temperature is 1200-1350℃, sintering time is 80-200min, protective atmosphere is argon, gas pressure is 20-30KPa, gas flow rate is 30-60L / min; H5, Cooling: Pass 60-90kpa high pressure argon gas and cool at a speed of 5-10℃ / min.

6. The method for preparing the high glass fiber halogen-free injection molding machine screw rocket head according to claim 4, characterized in that: In step S3, the specific method of induction heating is: align the clean metal ceramic block with the clean mold steel rocket head tail feather part, turn on the induction heating device, and apply pressure at the same time to tightly combine the metal ceramic block and the mold steel rocket head tail feather part to complete the welding molding of the high glass fiber halogen-free injection molding machine screw rocket head.

7. The method for preparing the high glass fiber halogen-free injection molding machine screw rocket head according to claim 5, characterized in that: Induction heating frequency 75-200kHz, power 2-35KW, voltage 6-12V, current 70-200A, pressure 0.5-0.7Mpa, induction welding time 3-8s.

8. The method for preparing the high glass fiber halogen-free injection molding machine screw rocket head according to claim 5, characterized in that: Metal anti-oxidation is added during welding to improve the welding effect and prevent the welding interface from oxidizing before welding.

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