CN220482432U - Valve needle and injection mold - Google Patents
Valve needle and injection mold Download PDFInfo
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- CN220482432U CN220482432U CN202322034219.0U CN202322034219U CN220482432U CN 220482432 U CN220482432 U CN 220482432U CN 202322034219 U CN202322034219 U CN 202322034219U CN 220482432 U CN220482432 U CN 220482432U
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- needle
- needle bar
- bar
- valve
- stem
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- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 39
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910002110 ceramic alloy Inorganic materials 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 abstract description 19
- 238000000465 moulding Methods 0.000 abstract description 12
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 206010053615 Thermal burn Diseases 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010008 shearing Methods 0.000 description 4
- 238000005219 brazing Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The utility model relates to the technical field of injection molding, in particular to a valve needle and an injection mold. The valve needle includes first needle bar and second needle bar, and first needle bar is made by alloy steel, and first needle bar axial first end can be connected with the driving piece transmission in the injection mold. The tail of the second needle bar is coaxially connected with the second end of the first needle bar in the axial direction, the head of the second needle bar can extend to the position of the injection mold at the point of entry, the hardness of the second needle bar is greater than that of the first needle bar, and the heat conductivity coefficient of the second needle bar is smaller than or greater than that of the first needle bar. The injection mold comprises the valve needle. The second pin rod has hardness greater than that of the first pin rod, and is more wear-resistant so as to maintain the tightness of the pouring gate. Simultaneously, the second needle bar is made according to the material of the different coefficient of heat conductivity of different selection of product shaping temperature, avoids appearing product scald, thermal degradation when moulding plastics low temperature material. And the injection molding height Wen Liaoshi is high, the head of the second needle bar is quickly heated to the molding temperature, and the injection molding efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of injection molding, in particular to a valve needle and an injection mold.
Background
In an injection mold, valve needle materials in a hot runner system are mainly metal (mold steel, hard alloy and the like), heat conduction is fast, and the temperature of the head part of the valve needle at a position of advance can rapidly rise or fall, so that stable molding of an injection molding product is affected. For example, common mineral water bottles are generally colorless transparent bottles, and most of the injection molding materials are PET, and the PET material has a narrow molding temperature range and is extremely easy to thermally degrade at a temperature higher than 300 ℃. Because the heat conduction of alloy steel material is faster for the head of needle reaches the high point and forms shearing heat in the twinkling of an eye, lead to the product to appear scalding, problem such as thermal degradation. And the alloy steel valve needle has high heat dissipation efficiency and quick heat loss, so that cold materials are easy to appear in the position of the injection mold, and the molding quality of products is reduced. Meanwhile, as the valve needle can collide with the gate when the injection mold is opened and closed, the head of the valve needle can be worn out to a certain extent after being opened and closed for a plurality of times for a long time, the tightness of the matching position of the head of the valve needle and the mold rubber opening is reduced, burrs are generated at the rubber opening position of a product, and the qualification rate of the product is affected.
Disclosure of Invention
The utility model aims to provide a valve needle and an injection mold, which are used for solving the problems that in the prior art, when the valve needle made of alloy steel is subjected to injection molding, products are scalded, thermally degraded or cold materials occur, and meanwhile, the head of the valve needle is worn to cause poor sealing performance of a pouring gate.
The technical scheme adopted by the utility model is as follows:
a valve needle comprising:
the first needle bar is made of alloy steel, and the first axial end of the first needle bar can be in transmission connection with a driving piece in the injection mold;
the tail of the second needle bar is coaxially connected with the second end of the first needle bar in the axial direction, the head of the second needle bar can extend to the position of the injection mold at the point of entry, the hardness of the second needle bar is greater than that of the first needle bar, and the heat conductivity coefficient of the second needle bar is smaller than or greater than that of the first needle bar.
As a preferable scheme, one of the second end of the first needle bar and the tail part of the second needle bar is provided with a mounting hole, the other one of the second end of the first needle bar and the tail part of the second needle bar is provided with a positioning rod part, and the positioning rod part is fixedly arranged in the mounting hole in a penetrating manner.
Preferably, the mounting hole comprises a threaded hole and a guide hole which are coaxially communicated, and the guide hole penetrates through the second end of the first needle bar;
the second needle bar comprises a main body bar and a positioning bar part, the positioning bar part comprises a screw rod and a guide bar, one end of the main body bar is outwards extended with the guide bar and the screw rod in sequence, and the other end of the main body bar is the head part; the screw rod is in threaded connection with the threaded hole, and the guide rod is fixedly arranged in the guide hole in a penetrating mode.
Preferably, one end of the main body rod far away from the head is welded with the second end of the first needle rod.
Preferably, the end face of the end of the main body rod, which is far away from the head, is provided with a plurality of fusion grooves around the circumference thereof.
Preferably, a welding ring groove is formed between one end of the main body rod far away from the head part and the second end of the first needle rod.
Preferably, the welding position of the main body rod and the first needle rod is higher than the position of the positioning fitting in the hot nozzle main body of the injection mold.
Preferably, the second needle bar is made of graphene ceramic composite material.
Preferably, the second needle bar is made of ceramic or titanium alloy.
Injection mold, including foretell needle.
The beneficial effects of the utility model are as follows:
the valve needle and the injection mold provided by the utility model are provided with the split type structure of the first needle rod and the second needle rod which are made of different materials. The first needle bar is made of alloy steel, so that the first needle bar is firmly connected with a driving piece in an injection mold in a transmission way. The hardness of the second needle bar is larger than that of the first needle bar, so that the second needle bar has higher hardness and wear resistance, the wear of the second needle bar is greatly reduced, and when the head of the second needle bar abuts against the gate, the gate has good tightness.
When the low-temperature material is injected, the heat conductivity coefficient of the second needle bar is smaller than that of the first needle bar, so that the head of the second needle bar is prevented from instantly reaching a high point and shearing heat is prevented, and risks such as scalding and thermal degradation of products are avoided. Meanwhile, the second needle bar has a good heat preservation effect, and cold materials are prevented from occurring at the position of the advance point. When the injection molding is high Wen Liaoshi, the heat conductivity coefficient of the second needle bar is larger than that of the first needle bar, so that the head of the second needle bar is quickly heated to the molding temperature of the high-temperature material, and the injection molding efficiency is improved.
Drawings
FIG. 1 is a schematic view of a part of a hot runner system of an injection mold according to an embodiment of the present utility model;
FIG. 2 is an exploded schematic view of a valve needle provided by an embodiment of the present utility model;
fig. 3 is a schematic structural view of a valve needle according to an embodiment of the present utility model.
The parts in the figures are named and numbered as follows:
10. a driving member; 20. a diverter plate; 30. a hot nozzle body; 40. positioning fittings; 50. a valve needle;
1. a first needle bar; 11. a mounting hole; 111. a threaded hole; 112. a guide hole; 2. a second needle bar; 21. a main body lever; 22. positioning the rod part; 221. a screw; 222. a guide rod; 23. and welding the ring groove.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
The embodiment provides an injection mold, which is a hot runner mold and can realize injection molding processing of various plastic materials.
In an injection mold, valve needle materials in a hot runner system are mainly metal (mold steel, hard alloy and the like), heat conduction is fast, and the temperature of the head part of the valve needle at a position of advance can rapidly rise or fall, so that stable molding of an injection molding product is affected. For example, common mineral water bottles are generally colorless transparent bottles, and most of the injection molding materials are PET, and the PET material has a narrow molding temperature range and is extremely easy to thermally degrade at a temperature higher than 300 ℃. Because the heat conduction of alloy steel material is faster for the head of needle reaches the high point and forms shearing heat in the twinkling of an eye, lead to the product to appear scalding, problem such as thermal degradation. And the alloy steel valve needle has high heat dissipation efficiency and quick heat loss, so that cold materials are easy to appear in the position of the injection mold, and the molding quality of products is reduced. Meanwhile, as the valve needle can collide with the gate when the injection mold is opened and closed, the head of the valve needle can be worn out to a certain extent after being opened and closed for a plurality of times for a long time, the tightness of the matching position of the head of the valve needle and the mold rubber opening is reduced, burrs are generated at the rubber opening position of a product, and the qualification rate of the product is affected.
In order to solve the above-mentioned problems, as shown in fig. 1 and 2, the present embodiment further proposes a valve needle 50, wherein the valve needle 50 includes a first needle rod 1 and a second needle rod 2, the first needle rod 1 is made of alloy steel, and a first axial end of the first needle rod 1 can be in driving connection with a driving member 10 in an injection mold. The tail of the second needle bar 2 is coaxially connected with the second axial end of the first needle bar 1, the head of the second needle bar 2 can extend to the position of an injection point of the injection mold, the hardness of the second needle bar 2 is greater than that of the first needle bar 1, and the heat conductivity coefficient of the second needle bar 2 is smaller than or greater than that of the first needle bar 1.
In the present embodiment, the needle 50 is provided in a split structure of the first needle bar 1 and the second needle bar 2 which are different in material. The first needle bar 1 is made of alloy steel, so that the first needle bar 1 is firmly connected with the driving piece 10 in a transmission manner. The hardness of the second needle bar 2 is larger than that of the first needle bar 1, so that the second needle bar 2 has higher hardness and wear resistance, the wear of the second needle bar 2 is greatly reduced, and when the head of the second needle bar 2 reaches the point of entry to prop against the gate, the gate has good tightness.
When the low temperature material is moulded plastics, the coefficient of heat conductivity of second needle bar 2 is less than the coefficient of heat conductivity of first needle bar 1, avoids the head of second needle bar 2 to reach the high point and appears shearing heat instantaneously to avoid the risk such as scald, thermal degradation appear in the product. Meanwhile, the second needle bar 2 has a good heat preservation effect, and cold materials are prevented from occurring at the position of the advance point. When the injection molding is high Wen Liaoshi, the heat conductivity coefficient of the second needle bar 2 is larger than that of the first needle bar 1, so that the head of the second needle bar 2 is quickly heated to the molding temperature of the high-temperature material, and the injection molding efficiency is improved.
It should be noted that, in this embodiment, the heat insulation effect of the second needle bar 2 is always better than that of the first needle bar 1 regardless of the thermal conductivity, so as to avoid cold materials from occurring at the point of placement. Meanwhile, a material with a molding temperature less than 280 ℃ is defined as a low-temperature material, and a material with a molding temperature greater than or equal to 280 ℃ is defined as a high-temperature material. In other embodiments, other temperature ranges may be defined as either low temperature materials or high temperature materials, and are not specifically limited herein.
Specifically, the hardness of the first needle bar 1 made of alloy steel is 58 HRC-62 HRC, and the heat conductivity coefficient is about 60W/m.K. When the low-temperature material is injected, the second needle bar 2 can be made of a material with low heat conductivity and good wear resistance, such as titanium alloy or ceramic, wherein the ceramic can be ceramic added with zirconia, alumina and other materials. The heat conductivity coefficient of the ceramic is about 2W/m.K, which is far lower than that of the first needle bar 1 made of alloy steel material, so that the scalding of products is avoided, the second needle bar 2 made of ceramic material can be used for injection molding PET materials, and the molded products comprise common mineral water bottles, medical consumables and the like. When the injection molding height Wen Liaoshi, the material of the second needle bar 2 can be graphene ceramic composite material, so that the second needle bar 2 has higher heat conductivity coefficient to realize injection molding rapid prototyping, and meanwhile, the injection molding rapid prototyping has better heat preservation effect, and cold materials are prevented from occurring at the position of the inlet.
In addition, the ceramic cost is lower, the wear resistance is better (the hardness of the ceramic material is about three to four times that of common alloy steel), the wear amount of the second needle bar 2 is greatly reduced, and the sealing performance of the pouring gate of the injection mold is improved. Therefore, the valve needle 50 of the embodiment can avoid the problems of burrs, blushing, scalding, carbonization, silver marks, cold materials and the like of products at the position of the position, and improves the quality of injection molding products.
As shown in fig. 2, one of the second end of the first needle bar 1 and the tail of the second needle bar 2 is provided with a mounting hole 11, and the other one of the second end of the first needle bar 1 and the tail of the second needle bar 2 is provided with a positioning rod portion 22, wherein the positioning rod portion 22 is fixedly arranged in the mounting hole 11 in a penetrating manner so as to ensure that the first needle bar 1 and the second needle bar 2 are firmly assembled into a whole.
Specifically, the mounting hole 11 includes a screw hole 111 and a guide hole 112 that are coaxially communicated, and the guide hole 112 penetrates the second end of the first needle bar 1. The second needle bar 2 includes a main body bar 21 and a positioning bar portion 22, the positioning bar portion 22 includes a screw 221 and a guide bar 222, one end of the main body bar 21 is outwardly extended with the guide bar 222 and the screw 221 in sequence, and the other end of the main body bar 21 is a head. The screw 221 is screwed into the threaded hole 111, and the guide rod 222 is fixedly inserted into the guide hole 112. The guide hole 112 can guide the second needle bar 2, so that the screw 221 can rapidly and accurately extend into the threaded hole 111, and the assembly efficiency of the first needle bar 1 and the second needle bar 2 is improved. The threaded connection mode improves the connection strength of the first needle bar 1 and the second needle bar 2, and simultaneously makes the assembly operation of the first needle bar 1 and the second needle bar 2 simple and easy.
The lengths of the first needle bar 1 and the second needle bar 2 of the present embodiment are longer, when the first needle bar 1 and the second needle bar 2 are assembled in a threaded manner, one end of the main body bar 21 far away from the head needs to be welded with the second end of the first needle bar 1, so that the first needle bar 1 and the second needle bar 2 are connected into a whole to form the valve needle 50, and the structural strength and stability of the valve needle 50 are further improved. The first needle bar 1 and the second needle bar 2 are made of different materials, and may be made of brazing filler metals such as copper-based brazing filler metals and aluminum-based brazing filler metals, or may be made of alloy steel and ceramic by soldering, friction welding, or the like. When the welding is completed, post-treatment such as polishing is required to be performed on the weld at the weld ring groove 23 to ensure that the weld is coplanar with the outer peripheral surface of the second needle bar 2.
Further, a weld ring groove 23 is formed between the end of the body shank 21 remote from the head and the second end of the first shank 1. When welding along the weld ring groove 23, a weld is formed in the weld ring groove 23 to ensure flatness of the outer circumferential surface of the needle 50. The width of the weld ring groove 23 of this embodiment is about 0.5mm, i.e., the length of the guide bar 222 is 0.5mm greater than the depth of the guide hole 112. Further, the end face of the end of the main body rod 21 far from the head part is provided with a plurality of melting grooves around the circumference thereof, and the melting grooves are communicated with the welding ring groove 23 so as to increase the capacity of the welding ring groove 23 for welding pools and avoid overflow of the melting pools from the welding ring groove 23.
In the preparation of the first needle bar 1 and the second needle bar 2, standard needles were obtained by outsourcing. The first standard needle is made of alloy steel and is used for preparing a first needle bar 1, and the second standard needle is made of the same material as the second needle bar 2 and is used for preparing a second needle bar 2. The first standard needle is cut to equal length as the first needle bar 1 and the second standard needle has a certain machining allowance relative to the second needle bar 2. Then, a mounting hole 11 is formed in the first standard needle to form the first needle bar 1, while a positioning rod portion 22 is formed at one end of the second needle bar 2. And secondly, after the first needle bar 1 and the second standard needle are assembled, the welding ring groove 23 between the first needle bar 1 and the second standard needle is welded, so that the first needle bar 1 and the second standard needle are connected into a whole. Finally, the machining allowance of the second standard needle is removed according to the total length of the valve needle 50, and the head of the second needle bar 2 is machined by milling and grinding.
In the above process, when the welding is completed, the first needle bar 1 needs to be modified to ensure concentricity of the first needle bar 1 and the second needle bar 2. Specifically, as shown in fig. 3, machining is performed within a set length range defining a second end of the first needle bar 1 toward the first end, and a region corresponding to a length h is defined as a correction segment, the length h being about 2mm to 3 mm. The outer peripheral surface of the correction section and the outer peripheral surface of the second needle bar 2 are coplanar through processing treatment of the correction section, so that processing errors and assembly errors of the first needle bar 1 and the second needle bar 2 are eliminated, and coaxiality of the first needle bar 1 and the second needle bar 2 is ensured.
When the valve needle 50 is manufactured, the valve needle 50 is mounted in the driving member 10 in the hot runner system, and the driving member 10 of the present embodiment is a hydraulic cylinder or an oil cylinder or the like, which is not particularly limited herein. The first end of the first needle bar 1 is fixed in the cylinder body of the hydraulic cylinder or the oil cylinder so as to be in transmission connection with the output end (which can be a piston) of the hydraulic cylinder or the oil cylinder. As shown in fig. 1, the needle 50 passes through the flow dividing plate 20, the hot nozzle body 30, and the head of the second needle bar 2 reaches the entry point position in this order. Wherein, the positioning fitting 40 is installed in the hot nozzle main body 30, and the valve needle 50 movably penetrates through the positioning fitting 40 to guide and position the valve needle 50 through the positioning fitting 40.
It should be noted that the welding position of the main body rod 21 and the first needle rod 1 is higher than the position of the positioning fitting 40 in the hot nozzle main body 30, so that the connection part (the welding ring groove 23) of the first needle rod 1 and the second needle rod 2 is higher than the positioning fitting 40, and the second needle rod 2 is prevented from breaking and deforming.
The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. Valve needle, its characterized in that includes:
the first needle bar (1) is made of alloy steel, and the first axial end of the first needle bar (1) can be in transmission connection with a driving piece (10) in the injection mold;
the second needle bar (2), the afterbody of second needle bar (2) with first needle bar (1) axial second end coaxial coupling, the head of second needle bar (2) can extend to injection mold's advance some positions, the hardness of second needle bar (2) is greater than the hardness of first needle bar (1), the coefficient of heat conductivity of second needle bar (2) is less than or is greater than the coefficient of heat conductivity of first needle bar (1).
2. A valve needle according to claim 1, characterized in that one of the second end of the first needle bar (1) and the tail of the second needle bar (2) is provided with a mounting hole (11), the other of the second end of the first needle bar (1) and the tail of the second needle bar (2) is provided with a positioning rod part (22), and the positioning rod part (22) is fixedly arranged in the mounting hole (11).
3. A valve needle according to claim 2, characterized in that the mounting hole (11) comprises a threaded hole (111) and a guide hole (112) in coaxial communication, the guide hole (112) extending through the second end of the first needle stem (1);
the second needle bar (2) comprises a main body bar (21) and a positioning bar part (22), the positioning bar part (22) comprises a screw rod (221) and a guide bar (222), one end of the main body bar (21) is outwards extended with the guide bar (222) and the screw rod (221) in sequence, and the other end of the main body bar (21) is the head part; the screw rod (221) is in threaded connection with the threaded hole (111), and the guide rod (222) is fixedly arranged in the guide hole (112) in a penetrating mode.
4. A valve needle as claimed in claim 3, characterized in that the end of the body stem (21) remote from the head is welded to the second end of the first needle stem (1).
5. A valve needle according to claim 4, characterized in that the end face of the body stem (21) at the end remote from the head is provided with a plurality of melt grooves around its circumference.
6. Valve needle according to claim 4, characterized in that a weld ring groove (23) is formed between the end of the body stem (21) remote from the head and the second end of the first needle stem (1).
7. Valve needle according to claim 4, characterized in that the welding position of the body stem (21) and the first needle stem (1) is higher than the position of a positioning fitting (40) in the hot nozzle body (30) of the injection mould.
8. Valve needle according to any of claims 1-7, characterized in that the material of the second needle stem (2) is a graphene ceramic composite.
9. Valve needle according to any of claims 1-7, characterized in that the material of the second needle stem (2) is ceramic or titanium alloy.
10. Injection mould, characterized in that it comprises a valve needle according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322034219.0U CN220482432U (en) | 2023-07-31 | 2023-07-31 | Valve needle and injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322034219.0U CN220482432U (en) | 2023-07-31 | 2023-07-31 | Valve needle and injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220482432U true CN220482432U (en) | 2024-02-13 |
Family
ID=89824249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322034219.0U Active CN220482432U (en) | 2023-07-31 | 2023-07-31 | Valve needle and injection mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220482432U (en) |
-
2023
- 2023-07-31 CN CN202322034219.0U patent/CN220482432U/en active Active
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