TW464695B - Light metal forging material manufacturing method and forged member manufacturing method using the material - Google Patents

Abstract

This invention relates to a method for manufacturing a light metal forging material provided as a material to be subjected to a forging process for obtaining a light metal forged member, by charging a light metal molten material into the molding cavity of a specified molding die so as to form a forging material and subjecting the forging material to a specified heat treatment before the forging process, there is generated a blister attributed to internal gas expansion in the material, thereby, in obtaining a finished product made of light metal by forming a forging material and forging the material, a blister associated with heat treatment is reliably prevented from being generated in a product (forged member) through this forging process.

Description

6 ^ 695 V. Description of the invention (1) ^ The invention relates to a method for manufacturing light metal forging materials provided as a material for obtaining light metal forgings as an exchange forging process, and a method for manufacturing forgings by using the material branch through the forging process. Known manufacturing methods of light metals such as magnesium (the element is occasionally denoted by the symbol Mg), magnesium alloys, Shao (the element is occasionally denoted by the symbol A 1 hereinafter), and light gold made of aluminum alloy. The method is the most common. As for a casting method, a so-called injection molding method is conventionally used to achieve an accelerated casting process, which is a process in which light metal melt is injected and fed to a mold at a high pressure to significantly increase productivity. It is also known that the semi-solid casting method is used to inject and feed the semi-solid light metal melt (basically the degree of melting is lower than the melting point) to the mold, and it is in a completely molten state at a higher level than the usual melt casting method. The temperature of its melting point is opposite to that of pouring into the mold. Outside 1 In recent years, light metal parts manufacturing methods using injection molding methods have also been introduced. :: international: use, special locks and their alloys. This method uses injection molding ϋ = ΐ to inject molten metal in a molten state from its injection nozzle and into the final cavity. This method can be used in shorter cycles than the casting method

It is known to be relatively clean and comparative to casting methods such as injection molding for working I 2 process, and at the same time, it can obtain light metal molding products with high accuracy in terms of shrinkage defects. Negative and low yields are related to this injection molding method, and it is also known to be used to inject light metals in a semi-solid state (basically lower temperature than that of solid / injection molding private points).

88l22223.ptd Page 5 4 6 4 6 9 5

枓 is injected from the injection nozzle and enters the hibiscus Γ Suodi 2 A (for example, refer to the prior art reference document described in Japanese Patent Publication No. Z 15620). Not only the casting method is also injected into the German and local culture 'this material, " " " Casting due to the melting temperature (the semi-solid material used in the following 囡 舻 厶 Lu from the 丨 ± ^ ^ state) in the use of solid metal The material is quite low, because it is less likely to appear, and is suitable for high-speed and high-pressure burrs of the stomach. The good advantage is to enter the left side, which also provides productivity changes and feeds semi-solid melt to the fully molten liquid phase. The molten material is fed in a near laminar state, resulting in a very high-quality structure. This improvement is also achieved by turning the molten metal into a semi-solid cavity, where the non-melted solid phase is mixed and fed. Therefore, the molten metal is generated less frequently. Gas, to obtain a relatively uniform overall mechanical characteristics of the obtained component. Note that it will not melt but can maintain the solid part " instruction manual Tianshi metal melt system ±-w ^ 'and the term liquid phase means the B phase The bulk metal belongs to the melt phase " unmelted into the integrated metal ratio) " '' 'Solid phase 1 completely melts and enters the liquid part ,,; The solid metal parts obtained through observation

= Instead, it maintains the solid part, which is different from the liquid part, which is in the liquid state, and enters the liquid state in the semi-solid 2 state. V However, all of the other things that are not good are those that are still in the semi-solid light metal melt state. They are quasi-holding the solid (becoming solid) part. ~ ° ::: It is intended for this specification, the comparison ratio " This means that JH internal solid ㈣ for the whole material (solid phase + liquid phase ratio, the second-mentioned ratio is the observation of the solidified structure after the melting product has been injected into 4) The ratio of the points to the overall observation area (area ratio) is obtained and

464695 V. Description of the invention (3) Numerical values. It should be further noted that in this specification, the term "semi-solid" is used for light metal melts to basically indicate that coexisting conditions of solid (solid phase) raw materials and molten and entering liquid (liquid phase) raw materials " *. This state is usually obtained by heating the raw material below its burst point. It is assumed that the temperature of the light metal melt is approximately the melting point or that the solid phase state is approximately equal to 0% when the melting point is just exceeded. Even if the light metal melt itself has a solid phase ratio of approximately 0%, Consider, for example, the actual injection molding process of the semi-solid injection molding method. The solidified part (the so-called cold plunger) and the high solid phase part with a high solids ratio are generated on the slightly end side of the nozzle. The interval between injection) to the end of the mold and the next injection (next injection) is due to the cooling result of the metal melt in the injection nozzle melt feed path. Therefore, the light metal melt actually injected into the cavity inevitably contains a solid phase portion. For its part, if a light metal part is required to have a higher strength than the aforementioned casting method or injection molding method, the forging method is most commonly used. In addition, as for the method of manufacturing light metal parts by this forging method, the so-called casting_ forging method is known to use the casting method to form a material suitable for the forging process (forging material) before the forging process. This material is placed in a specific forging die and The material is subjected to a forging process, for example, a prior art reference document disclosed in Japanese Patent Laid-Open No. 6_297 1 27. According to this casting-forging method, a semi-finished product with a shape similar to that of the finished product (forging) is formed through the forging process at the casting (material) stage. This can simplify the forging process into a single-forging process and permit forging with complex shapes

4 6 4 6 9 5 V. Element of description (4). In addition, the material structure can be adjusted so that even materials with inferior forging properties can be subjected to the forging process without any trouble. It should be noted that the forging material formed by this casting-forging method can be performed by injection molding instead of casting method. However, the casting process (forging process) of this casting-forging method occasionally contains gas (including air) during the molten material feeding stage. If curing occurs in a state where gas is involved and gas is present inside, gas defects will remain inside the scale product. Especially when casting processes that can be fed at high speeds and high pressures, such as die casting, are used to form such forged materials, gas defects are more likely to occur, and the problem becomes more obvious. Such as the policy at T6, but if borrowed immediately after processing, the processing stage is quite high defects. The problem of obtaining strong strength is known as a method of performing aging and hardening treatment after heat treatment of a solution, usually as a heat treatment for improving mechanical properties and improving strength. The casting products obtained by the casting-forging method are generated in the casting stage (also expected to be the casting stage). As mentioned above, gas flaws are included in the interior, and then the T6 process swells (so-called bubbles) because the hot section of the solution exists in the The inner gas expands, and it is heated and maintained during the heat treatment stage. The product obtained through the forging process (forging) is directly blistered. The shortcomings described above lead to the mechanical characteristics of the talented person, and the effect of the T6 treatment is not sufficient. The manufacturing process is based on the foregoing reasons, and can be fed at a high speed and high pressure. (For example, die casting) cannot be used for the casting-forging method of the casting process. This becomes a significant disadvantage to improving productivity. In addition, in the case where a forged product is obtained through a subsequent process, the same is observed.

464695 V. Description of the invention (5) The problem of blistering is not only observed when the forging material is formed by casting, but also by methods. Especially when using a high-speed and / or high-pressure feeding process of light metal dope to the cavity (for example, injection molding method in the case of forged materials), the bubble generation in the forged product is more obvious. And 'idea solution heat treatment' means a process in which a material or element is heated in a solid solution temperature range for a predetermined time, and then the material is adjusted to room temperature 'to promote homogenization of the material structure. For example, four or more percent by weight Mg is taken as an example to explain that the compound formed through the aforementioned ^^ (Mgl7A112) is dissolved in the material structure, and homogenization is promoted by heat treatment of the solution. It should be noted that the foregoing compounds are not produced in examples where the aluminum content is less than the weight ratio. Therefore, it is usually not necessary to perform a homogenization process by heat treatment of the melt. The invention is related to the technical problems just described, which may occur in the research of the present invention through the formation of forging materials and obtaining the light metal forgings in the forging process. The purpose is to reliably prevent the products (forgings) from heating through the forging process. Processing produces bubbles. Thus, a first characteristic aspect of the present invention provides a method for manufacturing a forged material, which is made of light metal and is provided as a material undergoing a forging process to obtain a light metal forged piece. The method includes the following steps: The weight metal melts into the cavity of the special molding die, thereby forming a forging material and subjecting the forging material to a specific heat treatment before the forging process, so that a bubble is generated due to the expansion of the gas inside the material. According to a first characteristic aspect of the present invention, when manufacturing a light metal forging material,

88122223.ptd 464695, description of the invention (6) When the forging process is used to obtain the material of light metal forgings, light gold is fed into the cavity of a special mold to form a forging material. This forging material is subjected to a specific heat treatment during the forging process. The preparation method causes bubbles due to the expansion of the gas inside the material. In this way, the subsequent processing causes the forged material to undergo the forging process. The bubbles that have been generated on the surface of the material in advance and / or near it are crushed again. In other words, the cavity portion existing as a bubble in the material (the surface and / or its vicinity) is compressed by the compressive force applied by the forging process, and this portion becomes the base metal. In other words, through the preliminary generation of bubbles in the material stage, this bubble can be oppressed through the forging process', so that forgings obtained in subsequent processes can prevent the generation of bubbles without error. The first characteristic aspect of the present invention is based on the aforementioned object of the invention, and the specific heat treatment is a solution heat treatment. According to the second characteristic aspect of the present invention, an effect substantially similar to the aforementioned process of the present invention can be produced. In particular, the aforementioned specific heat treatment is solution heat treatment, which can promote the uniform material structure of the forging village, improve the forging properties of the subsequent forging process, and improve the mechanical properties of the forging. Also in the second characteristic aspect of the present invention, based on the foregoing inventive feature, the heat treatment temperature of the solution heat treatment is not lower than 300 ° c. The reason why the lower limit value of the heat treatment temperature of the solution heat treatment is set to 300 ° C is that even if the material is subjected to the solution heat treatment at a temperature lower than the aforementioned temperature, the forged material cannot generate bubbles beforehand (before the forging process). According to the third characteristic aspect of the present invention, an effect similar to the aforementioned characteristic feature of the present invention can be basically produced. In particular, the heat treatment through the set solution heat treatment is not less than 3 0 0 C, which can be heat treated in the forging material through this solution.

46 46 9 5 V. Description of the invention (7)-(Before the forging process) air bubbles are generated. Further, according to the fourth characteristic aspect of the present invention, based on the aforementioned features, the heat treatment time of the solution heat treatment is not shorter than one hour. The reason why the lower limit value of the heat treatment time for the solution heat treatment is set to one hour is that the solution heat treatment with a transmission time shorter than the aforementioned value cannot effectively promote the homogenization of the material structure. According to the fourth characteristic aspect of the present invention, effects similar to the foregoing respective characteristics can be basically produced. In particular, by setting the heat treatment time of the solution heat treatment to be one hour or more, the homogenization of the material structure can be effectively improved by the solution heat treatment. In addition, in the fifth characteristic aspect of the present invention, the special solution heat treatment based on the foregoing invention is performed at a heat treatment temperature of not less than 350 ° C and not more than 450 ° C and a heat treatment time of not less than 10 hours and not more than Processing conditions longer than 24 hours were performed. The reason why the heat treatment temperature of the solution heat treatment is set to not less than 3 50 is that the solution heat treatment can be performed at a temperature higher than the aforementioned temperature to reliably generate bubbles in the forged material before the forging process. The reason why the temperature is set to not higher than 45 ° is that when the solution heat treatment temperature exceeds this value, grain growth occurs in the material structure, and the mechanical properties of the product obtained by the forging method are reduced. The reason why the heat treatment time of the solution heat treatment is set to not shorter than 10 hours is that the homogenization effect of the material structure can be reliably obtained by the solution heat treatment. The reason for setting the time to not more than 24 hours is that the effect becomes saturated and becomes uneconomical when continuous processing exceeds this time. According to a fifth characteristic aspect of the present invention, the aforementioned various books can basically be produced.

88122223.ptd Page 11 4 6 4 6 9 5

效果 ί "The effect of ί. Especially by setting the heat a ^ u adjacent Ba '彳' growth phenomenon on the condition of solution heat treatment to promote the reduction of mechanical characteristics of forgings; ί ^ 1 ΐ ΐ can be generated in advance. In addition, heat treatment Set time; get r: time and not longer than 24 hours. Therefore, the mechanical structure can be homogenized by solution heat treatment, so that the effect is not saturated and the sixth characteristic aspect of the green invention is based on the following steps of the present invention, ; 胄 After reduction, the reason why the relative density of the forging material is set to be not less than the lower limit value of the forging material is set to 90%. When the relative dense production is less than this value: the amount of air bubbles generated in the forging material phase is too large without ^ Flatten the bubble without error. As a result, it is difficult to ensure the tensile strength that is actually required. In addition, the variation between the maximum and minimum values becomes larger, resulting in stabilized strength. According to the sixth aspect of the present invention, it is basically possible to produce The effect is similar to the aforementioned feature. In particular, the relative density is set to not less than 90% after the prescribed heat treatment. In this way, good air bubbles are obtained by the crushing stage. In addition, in the seventh characteristic aspect of the present invention, the relative density of the forged material after heat treatment is specified to be not less than 9 based on the aforementioned characteristic feature of the invention. The lower limit value of the relative density of the forged material is set. When the degree is not less than this value, good forgings can be obtained by bubble without error. The result can be

88122223.ptd page 12 The reason for setting 95% is that when relatively dense rolling is performed, the gas previously generated in the forging stage is sufficient to ensure the tensile strength that is generally required in practice

464695 V. Description of the invention (9) Strength ° In addition, the change between the maximum value and the minimum value is very small, so that it is stable to obtain the tensile strength. | According to the seventh characteristic aspect of the present invention, an effect similar to the aforementioned characteristic feature of the present invention can be basically produced. It is specifically stipulated that the relative density after heat treatment is set to not less than 95%. Second, by more reliably crushing the pre-generated air bubbles in the forging stage, it can be obtained from flawless * wall parts' results to ensure the generally required tensile strength. In addition, it is possible to stably obtain a high tensile strength with minimum and maximum variation. In addition, in the eighth characteristic aspect of the present invention ', based on the aforementioned characteristics of the invention, the forging material is formed by the semi-solid feed of light metal melt in the cavity of a predetermined mold. According to the eighth characteristic aspect of the present invention, a characteristic effect similar to that of the foregoing invention can be basically produced. In particular, by using a semi-solid light metal melt to form a forging material, and comparing a process using a completely molten molten material, a high-quality forging material with a small number of shrinkage cavities and gas defects can be obtained. In addition, due to the low temperature of the molten material, fewer weldments are present, and burrs are suitable for high speed and / or high pressure processes', which also provides the advantage of improved productivity. In addition, in the ninth feature aspect of the present invention, forging can be performed by injecting and feeding a light metal melt into a cavity of a predetermined mold based on the aforementioned feature of the present invention. According to the ninth characteristic aspect of the present invention, an effect similar to that of the foregoing invention can be produced basically in the following cases, and an injection molding method for generating bubbles through the heat treatment solution is used to form a forged material.

46 46 9 5 V. Description of Invention (ίο) Materials can be manufactured in a short cycle time. In addition, a 'comparative casting method such as die casting method can obtain a light metal forging material which is clean and highly safe in terms of the working environment' and has high accuracy, uniformity, and few shrinkage defects in terms of quality. In addition, in a tenth characteristic aspect of the present invention, based on the foregoing inventive feature, the light metal is a magnesium (Mg) alloy containing four or more weight percent aluminum (A1). The reason why the lower limit of the aluminum content is set to 4% by weight is due to the homogenization process that does not require solution heat treatment, because when the aluminum content is less than this value, the compound that may hinder the homogenization of the material structure in the pre-stage (Mg 1 7 A1 1 2) Not generated. According to the tenth characteristic aspect of the present invention, an effect similar to the features of the invention can be basically produced in the following cases. When the magnesium alloy content is not less than the weight ratio and a magnesium alloy that needs to be homogenized by solution heat treatment is used as a material, it is possible Generates compounds that hinder the homogenization of materials in previous processes (Mgl7A1 1 2). In addition, according to the eleventh aspect of the present invention, a method for manufacturing a forging includes the following steps. For example, if the light metal forging material in the first to tenth of the scope of the patent application is subjected to the forging process, the bubbles contained in the forging material are flattened. The present invention: An eleventh characteristic aspect, according to the aforementioned first to tenth party bubbles. Via the aforementioned method ④ ^, the cavity part which has already been rolled up includes the forging material. The second part is forged. The plant (the surface and / or its solid base metal is attached. In other words, the pressure is rolled out and this part becomes foamed. Bubbles can be generated through the forging process at the Zaping material stage. This will prevent the forgings from being obtained in subsequent processes.

88122223, ptd Page 14 4 G 46 9 5 V. Description of the invention (11) Bubble formation. As a result, by subjecting the forging to aging and hardening under a prescribed heat treatment condition, a defective flawed forging having high strength and no air bubbles can be obtained. In this case, an effect similar to any one of the features of the first to tenth inventions can be obtained. In addition, in the twelfth feature aspect of the present invention, based on the foregoing invention feature, the light metal forging material is heated through a predetermined heat treatment 'and then directly subjected to the forging treatment without being subjected to a cooling process. According to the twelfth aspect of the present invention, an effect substantially similar to the features of the foregoing invention is produced. Alas, the light metal forging material is heated through the prescribed heat treatment, and then subjected to the forging process without cooling. Therefore, the heat treatment for heating to the forging temperature before the forging process can be eliminated and the sintering can be significantly reduced. In addition, in the thirteenth characteristic aspect of the present invention, based on the foregoing invention feature, the second heat treatment is performed at a heating temperature lower than a predetermined heat treatment after the forging process. & According to the thirteenth feature aspect of the present invention, an effect similar to the aforementioned features can be basically produced. The second special heat treatment is performed after the forging process at a temperature lower than J: heat treatment plus ..., J degrees. . Therefore, no bubbles were generated after the forging process through heat treatment. Therefore, in this book, Mao Mingzhi: The fourteenth characteristic square s' is based on the foregoing invention characteristics, and the second heat treatment is a treatment related to a prescribed heat treatment. According to this issue :: The fourth feature aspect, basically available categories: Ming feature = fruit • Especially through the heat treatment process (specified heat treatment and second heat treatment) before the forging process and interrelated, can be executed ;;

8812222 3.ptd Page 15 Side I 464695

The required heat treatment does not generate bubbles in the forging. In addition, in the fifteenth feature aspect of the present invention, based on the aforementioned features, the heat treatment is defined as solution heat treatment 'and the second heat treatment is aging hardening. According to the fifteenth characteristic aspect of the present invention, the effects of the aforementioned characteristic features can be substantially produced. In particular, the solution heat treatment and the aging hardening treatment are performed separately and separately before and after the forging process, and the required heat treatment can be performed to generate bubbles in the forging. In addition, in the sixteenth aspect of the present invention, the aging hardening treatment and the heat treatment temperature based on the foregoing invention feature are not lower than 01. The reason why the lower limit value of the heat treatment temperature for the aging hardening treatment is set to 001 is that the aging hardening cannot be effectively generated in the forging material at a temperature lower than the aforementioned temperature. According to the sixteenth characteristic aspect of the present invention, an effect similar to the aforementioned characteristic feature can be basically produced. In particular, the heat treatment temperature of the aging hardening treatment is set to not less than 100 C, so that the aging hardening effect can be produced in the forging. In addition, in the seventeenth characteristic aspect of the present invention, based on the foregoing inventive feature, the aging and hardening treatment is performed under the following processing conditions, the heat treatment temperature is not lower than 100 ° C but not lower than 250 ° C, and heating The processing time is not shorter than 3 hours and not longer than 24 hours. The reason why the lower limit value of the heat treatment temperature of the aging hardening treatment is set to 丨 〇 〇 is that at a temperature lower than the foregoing value, effective aging hardening cannot be caused in the forging material. The reason why the upper limit value is set to 250 ° C is that when the temperature exceeds this value, aging and hardening are performed excessively. As a result, the tensile strength and ductility cannot be compatible and satisfied within an appropriate range.

88122223.ptd Page 16 464695 V. Description of the invention (13) The reason for aging and hardening treatment is from No. + named for t gas, f bismuth *, and the reason for setting the lower limit of the processing time to 3 hours is set to 2 ", C effect produces aging and hardening. At the time, the effect reaches saturation. When the treatment continues for more than this period of time, the effect according to the seventeenth feature of the present invention 1 is not old: =, basically produces similar hair ^^ inn r ^ ^ The heat treatment temperature of the heat treatment is set to be two or two degrees effective for aging and hardening: this method can be obtained in the forging range, and U = degree and elongation can be appropriately hardened. The heat treatment time: ^ degree aging and hardening. In addition, when aging. With this arrangement, the effect will be saturated in hours and not greater than 24. The effect will become saturated and economically and effectively produce a hardening effect, and the details of better specific examples can be avoided @ The injection molding method used in the present invention to form will be described later with reference to the drawings: with details of the preferred specific example, first refer to the formation of silver according to this specific example. For illustration Partial cross-sectional view of the molding device is shown in this figure. The injection molding of the metal forging material is shown in the figure. 'The injection molding device 1 is a so-called screw-type device. 4 It includes a barrel 2 and a nozzle 3 at its slightly part. And heated by ^ 4, screw 6 is supported on the barrel 2; The heater is connected to the barrel 2, and the rotary driver 7 is provided with, for example, an air compressor body 5 with a rotary drive screw 6, a hopper 8 and the like; ^ a reducer and the like are used for the feeder 9 for feeding raw materials to the molding Simultaneous measurement of the inside of the hopper 5

IH 88122223.pid 464695

88122223.ptd Page 18 464695 V. Description of the invention (15) ---- Structure (not shown in the figure) and the screw placed in the retracted position is advanced to apply a specific pressure, and the semi-solid light metal melt is injected into the metal from the nozzle 3 Mold 1〇. In other words, the light metal melt is fed from the nozzle 3 through the gate portion 12 to the mold cavity. ^ Inside: In this specific example, a magnesium alloy that is a light metal is used as a raw material, and the injection mold is fed in the form of chip pellets, for example.制 装置 丨 的 hopper8. The path extending from the hopper 8 to the inside of the molding body 5 is preferably filled with an inert gas (such as argon) to prevent the oxidation reaction of the raw materials (magnesium alloy pellets). The cavity 11 of the metal mold 10 is preferably the shape of the forming cavity of the forging mold (shown) used in the forging process performed by the injection molding, and the semi-finished product (forged material) of the injection molded product can be obtained similarly to the subsequent process. The obtained product forging shape. This simplifies the forging process into a single final forging process, and can forge components with even complex shapes. In addition, even inferior forging materials can be forged without problems. According to the conventional procedure, as shown in FIG. 7, after the forging material forming process (step S51) is performed, the forging material subjected to injection molding through the injection molding device 1 and the metal mold 10 is subjected to the forging process (step S52). The obtained forging is subjected to T6 treatment, including solution heat treatment (step S5 3) and subsequent aging hardening treatment (step S54). However, as mentioned previously, the so-called bubbles are considered in relation to the solution heat treatment stage according to the conventional method. If this bubble appears in the forged product C (forged product obtained in the subsequent process) and becomes a defect, the mechanical properties of the forged product are impaired, and as a result, the effect of improving the strength through the T6 treatment cannot be fully obtained, and the appearance is also impaired. Therefore, a process for removing air bubbles is needed. So this specific example is obtained by designing forging material and forging the material

464695 V. Description of the invention (16) Forging process and heat treatment sequence are designed for light metal forging products. Cocoa prevents this forged product (forging) from generating bubbles associated with heat treatment, and obtains excellent forgings (that is, high-quality forgings with few defects and prescribed mechanical characteristics). In other words, as shown in FIG. 6, the forging material is formed by the injection molding device 丨 and the metal fitting 10 by semi-solid injection molding (step S1), and then the forging material is subject to the prescribed conditions for adding money before the forging process ^. Next reason (step S2). Through the aforementioned treatment, gas can be generated in the forging stage in advance. It should be noted that bubbles are usually generated in the form of blistering similar to skin burns on the material surface and / or near it, so it is easy to detect the blistering by visual observation. As described above, the pre-formed bubbles are preliminarily processed using a predetermined forging process (S3). Through this process, the air bubbles that are preliminarily generated on the material surface and / or in the vicinity thereof are dried out. In other words, the cavity portion existing as a bubble in the material (surface: / or its vicinity) is flattened by the compressive force applied during the forging process', and this portion becomes a solid base metal. = After forgings are subjected to aging and hardening under specified heat treatment conditions b 4). ′ Test 1: 2 A test to verify the effect of improving the strength of the forging according to the present invention. The test results are shown in Figure 2. This confirmation test was performed using two types of magnesium alloy raw materials (Alloy A and Alloy B) listed in Table 1 below. Value = ί self-contained 4 or more percent weight ratio ... lower limit of the title. The reason for this is that when the aluminum content is less than this value, the compound (Mgl7A112) that previously produced or hinders the homogenization of the material, because

464695 V. Description of the invention (17) This does not require solution heat treatment for homogenization. Table 1 (Unit: percentage by weight) A1 Zn — Mn F e Ni Cu Mg alloy A 7.2 0.2 0.22 〇. 003 0.0 0 0 8 0.001 lT1 & Difference alloy B 9.0 ^ ^ Λ 0.7.1, Di Γ 0.23 0.003 0.0 0 08 0.001 The formation of the difference material. Comparative Example 1 shows a case where the concrete treatment is not performed after injection molding, and Comparative Example 2 shows a case where injection is performed according to a conventional process and T6 treatment is performed (refer to FIG. 7). The heat treatment conditions of the comparative example 2 and the aging hardening treatment of the solution heat treatment of the present invention are exactly the same, as described later. • Solution heat treatment Alloy A: The heat treatment temperature is 400 ° C and the dwell time is 10 hours. Alloy B: The heat treatment temperature is 410. (: And dwell time is 16 hours. _Aging and hardening alloy A: heat treatment temperature is 75 t and dwell time is 16 hours. Alloy B: heat treatment temperature is 170 t and dwell time is 16 hours. Forging process is by heating and maintaining The heat treatment temperature of the solution heat treatment, and the forging material is directly set in the forging die without cooling in this specific example, so that the heat treatment before the forging process to the forging temperature can be avoided and the forging process can be significantly simplified. Comparative Examples 1 and 1 2 and each forging of the specific example of the present invention cut a tensile test piece according to a predetermined shape and size, and check the tensile strength of the test piece. The results are shown in

4 6 4 6 9 5 V. Description of the invention (18) Figure 2. As is apparent from the line diagram of FIG. 2, it can be easily understood that it can be used for any material of alloy A or alloy B. Compared with Comparative Example 1, Comparative Example 2 has a tensile strength improvement effect of about 20% or less, and the present invention has an improvement effect. About 50% or more. According to the foregoing description, it can be confirmed that the forging of the present invention can sufficiently obtain the effect of improving the strength by heat treatment of the forging of Comparative Comparative Example 2. The standard tensile strength of jis MDI alloy die-casting alloy is 230 [Mpa], which is the strength generally required in practice. In the example of the forging of the present invention, the tensile strength of any one of Alloy A and Alloy B sufficiently exceeds this strength (2 3 0 [Mpa]). The formation of bubbles in the forged part of Comparative Example 2 was observed, while the forgings of the specific example of the present invention were not observed to have bubbles and the appearance was not damaged. As a specific example of “Do n’t be jealous + I”, when manufacturing light metal forging materials and providing ^ for light metal forgings to obtain the forging process, it is better to be semi-solid male_ It is a six-purpose mold that is injected and fed with special molds In the process of forming forging two materials, the process is purely subjected to heat treatment, and the internal gas is expanded to form bubbles. Because I = cause this forged material to undergo the forging process or the bubbles generated near it, ... In other words, the surface and / Γ tin ft / -V- '-tJ- are cut * the bubbles exist on the material (surface and / or near it) The cavity part is flattened by a forging bucket, and this part becomes a solid base, which undergoes aging under the heat treatment conditions specified by the "compressed compressive force"; the soil makes the forged part a flawless forged part that does not generate air bubbles. In the present invention having high strength, the forging process is performed. The heat treatment temperature and subsequent heat treatment in the forging and Π ..., and maintaining the solution heat treatment ^ ^ solidified forging material without cooling

464695 V. Description of Invention (19) However. However, it is acceptable to cool the forging material and then heat the material to the forging process. In this case, it is also possible to accept the forging material after cooling, etc., to scrape off the air bubbles that have been preliminarily generated on the surface of the material and / or its vicinity through the solution heat treatment, and then perform the forging process. Since the removal of air bubbles' before the forging process can reliably obtain flawless forgings regardless of the degree of air bubble generation. Test 2 Test 2 was followed to examine the relationship between the heat treatment temperature of solution heat treatment and the formation of bubbles. Test 2 is a method of injecting the semi-solid injection-molded forging material at various heat treatment temperatures (20 (TC, 250. (:, 300t :, 350 t, and 400 ° C)) and subjecting the solution to heat treatment and checking whether the Air bubbles are generated. The air bubble generation test is performed using the aforementioned alloy A in Table 1. The test results are shown in Table 2 ^ Heat treatment temperature --- generated [bubble 200 ° C 250 ° C not present 3 0 0 t not 350 ° C Presence of 400 ° C Existence-year, w, ba, baishi soil / JIIL Tie / Interview at 300 C (200 C., 2500 t, and 300. 0) No bubbles are generated, and when the temperature exceeds 30 0 ° C (350 ° C and 400 ° C) bubbles are generated. Therefore, in order to prepare bubbles for this material (before the forging process) after forming the forging material, it is suitable to be not less than 30 (rc and preferably not lower) Solution heat treatment at 35 (rCi heat treatment temperature) reliably generates bubbles.

4 6 4 6 9 5 V. Description of the invention (20) Test 3 Test 3 was next performed to check the effect of heat treatment time of solution heat treatment on the hardness of the forging or finished product. The test results are shown in Figure 3. According to Table 3, Table 1 Alloy A is used as a material that undergoes semi-solid injection molding. As for the forged material obtained through this process, the comparative example (curve j 1 and curve j 2 of the line diagram in Fig. 3) is the same as that in the previous procedure that has been subjected to the forging process and subsequently to the T6 treatment (solution heat treatment + aging hardening treatment). Example (curve K1 and curve K2 of the line diagram of Fig. 3) 'According to the method of the present invention, the solution is firstly subjected to solution heat treatment, and then subjected to the forging process. (Vickers hardness: HV). The heat treatment temperature of the solution heat treatment of Test 3 was set in two ways as follows. • Curve j 1 and curve κ 1 of the line diagram of FIG. 3 ·· Heat treatment temperature of 40 0 t • Curve J2 and curve K2 of the line diagram of FIG. 3:

The heat treatment temperature is 450 ° C. The aging and hardening treatment is to maintain the material at 75 X. The temperature is maintained for 15 hours and then cooled in the air. 3 The line diagram in Figure 3 shows that the hardness of the forged product (forging) is 4 5 The example is based on the reduction in the duration of the solution heat treatment time corresponding to the curve j 2 of the comparative example 'so that it is found that grain growth occurs outside the material structure. Therefore, the mechanical properties of the product obtained through the forging process in this example are deteriorated. On the contrary, according to the curve K2 of the specific example of the present invention, the similar temperature is 45 ° i

88122223.ptd Page 24 464695] V. Example of the description of the invention (21) (Curve K1) 'Even in the case where the heat treatment temperature is 4 5 0t, there is no decrease in the hardness of the forged product. No grain growth was observed inside the material structure. In this case, the time required for solution heat treatment can be shortened by increasing the heat treatment temperature in a temperature range not lower than 450 ° C. In addition, according to the graph of FIG. 3 in each curve example, as long as the heat treatment duration of the solution heat treatment does not exceed one hour, the decrease in hardness is insufficient and unstable. In order to effectively obtain the effect of homogenizing the material structure through solution heat treatment, the heat treatment time of solution heat treatment is required to be not less than one hour. It is found that the heat treatment time is preferably not less than 10 hours, and the effect is more reliably obtained. If the heat treatment exceeds 24 hours, the effect becomes saturated and uneconomical. Test 4 Secondly relatively hard This test heat treatment was affected by forging. Knot according to material. Post-acceptance Tension Test Forging Examines the effect of the tensile strength of forgings before forging (that is, forgings obtained after solution heat treatment). The test system has an example in which bubbles are preliminarily formed through the solution before the forging process according to the present invention. The effect of the degree of bubble generation on the mechanical characteristics of the product (forging) that has undergone the process and aging and hardening treatment is shown in FIG. 4. Test 4, Table 1 The material of alloy A is used for accepting semi-solid injection molding. The forged material thus obtained is first subjected to solution 埶 treatment, lacking the forging process and then receiving the old 'concerned' product according to the method of the present invention (the forging is cut from the product Test pieces with specific shapes and sizes, and check the tensile strength of these test pieces. The relative density of the former material (forging material) is changed by changing the ^ liquid heat treatment conditions

46 46 9 5 V. Description of the invention (22) Changes from about 84% to 97. Figure 4 shows that when the relative density of the forging material before forging is not less than 95% (corresponding to the amount of generated bubbles is not less than 5%), dense forgings are obtained by guiltyly flattening the air bubbles generated in the forging material in advance. As a result, it was found that a tensile strength of at least 260 [Mpa] was ensured and a high tensile strength was stably obtained with little change between the maximum and minimum values. If the relative density is not less than 90%, it can ensure that it is usually actually needed and is about the maximum intensity (2 3 0 [Mpa]), but it may vary. On the contrary, if the relative density is less than 90% ', the variation between the maximum value and the minimum value of 230 [Mpa]' which is usually actually required cannot be ensured, and as a result, it becomes difficult to obtain stable strength. The presumption is attributed to the preparatory amount of bubbles generated during the forging material phase being too large to reliably level. According to the above requirements, set the relative density of the forging material to have a density of not less than 90% before forging, and then ensure the tensile strength of 23 °, [Mpa], which is usually actually required, and set the relative density to not less than 95. Southern tensile strength. ‘^ Test 5 Test 5 was followed to examine the effect of the heat treatment temperature of the aging hardening treatment on the hardness of the forged product (forging). The test results are shown in FIG. 5. According to Test 5, alloy B of Table 1 was used as a semi-solid injection molding material. The forged material thus obtained was first subjected to a solution heat treatment, then a forging process, and then subjected to an aging hardening treatment according to the method of the present invention, and the heat treatment temperature may be changed. The hardness (dimensional HV) of the surface and / or the vicinity of the obtained product was measured. The solution heat treatment of Test 5 was performed at a heat treatment temperature of 4 〇 t and a dwell time ^ 6

4G 46 9 5 V. Description of the invention (23) hours. The aging and hardening treatment is performed while the material is maintained at each temperature for 6 hours and then cooled in the air. According to the line graph of FIG. 5, it is found that when the aging hardening treatment temperature is lower than 100 °, it is impossible to perform aging hardening on the forgings, and when the temperature exceeds 25 ° c, excessive aging hardening causes excessive hardness. It is known that forgings have low elongation, but if excessive aging hardening is performed on the forging material, tensile strength cannot be sufficiently obtained, and as a result, two factors cannot be obtained in a compatible range within a proper range. Therefore, it is required to maintain the aging and hardening treatment temperature at 007 or higher, and it is preferable to set the upper limit of the temperature to 250. . Or below. In addition, in terms of aging and hardening treatment, it takes at least 3 hours to cause effective aging and hardening of the forging. When the treatment exceeds 24 hours, the effect becomes saturated and uneconomical. — Note that the previous specific examples are based on the case of semi-solid injection molding. However, the present invention is not limited to this example, and # can be effectively applied to other methods of forming materials such as semi-solid scales; for example, it is a kind of light metal shock-melting material with a fully melted state for H The manufacturing method is described based on the lock alloy as the injection material method. Then, within the scope of its essence, various modifications to the design, etc.

88122223.ptd Page 27 The effect is used in other light metal materials. The invention of the present invention may be as described above. The present invention is not limited to the foregoing 46 46 9 5 Brief description of the drawings FIG. 1 is an explanatory diagram schematically showing a partial cross-sectional view of a device made according to the present invention; Fig. 2 is a line diagram showing the effect of improving the tensile strength of the forging according to the test results. Fig. 3 is a line diagram showing the relationship between the social effects and the holding time according to the test 3. Fig. 4 shows the hardness of the forging and the solution heat treatment. The line graph shows the relationship between the relative density of the roots ns manufactured by the method of the present day and month before casting: Figure 5 is a line graph showing the relationship between the aging and hardening treatment temperature of the results of the forging test 5 not manufactured by the method of the present invention. "Hardness" is a diagram illustrating a forging method according to a specific example of the present invention according to Fig. 6. Fig. 7 is a diagram illustrating a forging method manufacturing process according to an example of the prior art.

88122223.ptd

Claims (1)

46 46 9 5 _ Case No. 88122223 — Health B 倐 正 ^ --- 〆々, patent application · 1 · A light metal forging material manufacturing method, providing forging materials for the release of 'for use to obtain forging elements made of light metal The method includes the steps of: y feeding a light metal fused material to the inside of the cavity of the special mold to forge the material; and causing the forged material to accept the prescribed reason before the forging process, so a bubble is generated due to the expansion of the gas inside the material. 2. For the manufacturing method of light metal forged material according to item 1 of the scope of patent application, wherein the prescribed heat treatment is solution heat treatment. 3. For the method for manufacturing light metal forged materials according to item 2 of the scope of the patent application, wherein the heat treatment temperature of the solution heat treatment is not lower than 300c. 4. For the manufacturing method of light metal forging materials according to item 2 of the scope of the patent application, the heat treatment time of "Guye heat treatment" is not less than 1 hour. 5 · As for the manufacturer of light metal forging materials in the second scope of the application for patents, among which, the solution heat treatment is performed at a heat treatment temperature of not less than 3500c and not higher than 450 ° C and a heat treatment time of not less than 10 hours and not more Performed under the conditions of 24 hours. 6. The manufacturing method of light metal forged materials according to item 1 of the scope of patent application, wherein the relative density after the prescribed heat treatment is set to not less than 90% °; 7. The manufacturing method of light metal forged materials according to item 6 of the scope of patent application, where The relative density after the prescribed heat treatment is set to not less than 95%. 8 The manufacturing method of light metal forging materials as described in the item No. 丨 of the patent scope, wherein the forging material is formed by feeding a semi-solid light gold shoulder molten material into the cavity of a special mold. 9 Manufacturing method of light metal forging materials as described in the scope of patent application 88122223.ptc Page 29