JPS61186445A - Metallic mold for molding resin - Google Patents

Abstract

PURPOSE:To shorten the time required to manufacture a metallic mold and to improve the work efficiency and productivity by using an Al alloy for a casting contg. specified amounts of Zn, Mg and one or more among Si, Fe, Cu, Ni, Mn, Ti, B, Cr, Zr and Be. CONSTITUTION:The composition of an Al alloy for a casting is composed of, by weight, 1-8% Zn, 0.5-6% Mg (Zn+Mg>5%), one or more among 0.2-1.5% Si, 0.2-1.5% Fe, 0.2-2% Cu, 0.2-2.5% Ni, 0.1-1.5% Mn, 0.01-0.8% Ti, 0.001-0.2% B, 0.05-0.7% Cr, 0.02-0.5% Zr and 0.001-0.1% Be, and the balance Al with inevitable impurities. A metallic mold for molding resin is manufactured with the Al alloy.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mold for resin molding.

More specifically, the present invention relates to an aluminum alloy casting mold that can shorten the manufacturing period and has excellent workability, productivity, and energy saving properties, which are in high demand these days.

[Conventional technology]

Traditionally, resin molding molds were mostly used for cutting steel and cast steel materials.
It has been manufactured by cutting zinc alloy casting materials and aluminum alloy forging materials.

In some cases, aluminum alloy casting materials are used (a) by precision casting with almost no cutting, or (1)) by partially cutting sand casting or precision casting. There are nine.

The aluminum alloy casting materials currently used in Todoro include Al with a purity of PO1 or higher (A1220%, balance impurities), Silumin (AI-si type, Al-81-M
g series), Lautal (Al-8i-Ou series), hydronalium (A:L 7Mg series) alloys, etc. are often used without heat treatment.

[Problem that the invention seeks to solve]

The mechanical properties of the mold made of the above-mentioned current aluminum alloy casting material are tensile strength of 2oYi, Prinell hardness of about 70,
It has problems such as being easily damaged and deformed, and its usable range is limited. The strength of current aluminum alloy casting materials can be improved by heat treatment, but thin castings in particular may be deformed by heat treatment, so it is desired to obtain high strength without heat treatment.

Additionally, pinholes and cavities may occur in current aluminum alloy castings, which reduce weldability and make overlay repair difficult.

However, on the other hand, aluminum alloy casting materials have the following characteristics: (1) Compared to steel, cast steel, and zinc alloys, aluminum alloy casting materials have the following characteristics: (1) They are light in weight, making them easier to work with, preventing industrial accidents, and reducing operating energy.

(11) Good thermal conductivity reduces heating and cooling time, improving productivity and saving energy.

(1) Good corrosion resistance makes storage easy and has a long life.

aV) Good machinability and shortened manufacturing time.

In addition, as a cast material, compared to a machined material, (1) Cutting time is shortened if cast surface and dimensional accuracy can be obtained by casting. The difference is more pronounced for products with complex shapes or patterns.

(11) With cutting materials, cooling and hot water pipes can be produced by drilling and surrounding the pipes, reducing processing time.

(ml　Easy to respond to short-term production of multiple pieces.

It also has the advantage of reducing costs by shortening the construction period.

Further, even if the same casting material is used, if the wall thickness can be made thinner, workability, productivity, and energy saving effects will be significant, but this is difficult to achieve with the current aluminum alloy casting materials from the viewpoint of castability and strength.

[Means for solving problems]

Based on the above facts, the inventors of the present invention have conducted extensive studies to take advantage of the above-mentioned aluminum alloy casting materials, and have decided to use an AN-Zn-Mg based alloy casting material, which is different from the conventionally used aluminum alloy casting materials. We have arrived at the present invention.

In addition to the advantages of conventional aluminum alloy casting molds, the present invention provides a mold that has more advantages of aluminum alloy casting, such as being able to be cast thinner and having higher strength, which improves durability. With Zn/-1%, MgO,j-6%,
The total amount of and Mg is more than jLs, and K 810
．． 2-7.3%, We O, 2-1. j%, O
u 0.2~kochi, N10. Co~j, j%, MnO
,/~/,j%,TiO,0/~o,r fb
, B o,oot -o,r %, OrO,Oj~0
．． 7%, ZrO, 02-0. r% and BeO,00/
The gist of the present invention is a mold for resin molding, characterized in that the mold is made of an aluminum alloy casting containing at least 0.1% of an additional element selected from the group consisting of ~0.1%, with the balance consisting of aluminum and impurities. It is something to do.

Hereinafter, the present invention will be explained in detail.

In the aluminum alloy casting material constituting the mold of the present invention, Zn and Mg have a strong influence on castability, strength, corrosion resistance, and stress corrosion resistance. ! (
If the total amount of Zn and Mg is less than J-1, sufficient strength cannot be obtained and it is lowered, so Zn is /-1%.
, preferably 2 to 7 yen, Mg 0.5 to 4%, preferably i, r-6%, and the total amount of Zn and Mg! On the width board, preferably 6% or more.

Furthermore, additional elements are added to improve castability, strength, corrosion resistance, and stress corrosion resistance, and the effects of adding each additional element are as follows. That is, (a) Si is 0.2~/,
Addition of J-chi, preferably O84 to 8λchi, helps improve castability, but Mu! Exceeding the limit will result in deterioration of strength.

) Fe goes to 0.2~! , preferably 0.4~
The addition of /, J and J is useful for improving castability and strength, but
%, strength and corrosion resistance deteriorate.

(c) Addition of u in the range of 0.21 to 100 mm, preferably 0.3 to 8!, is useful for improving strength and stress corrosion resistance, but when it exceeds 100 mm, castability and corrosion resistance are significantly deteriorated.

ni) N1 is Oo, 2~! , t%, preferably 0.3-t%, improves castability, but if it exceeds t-%, strength and corrosion resistance deteriorate.

(e) Mn is 0. /~8hechi, preferably O12~/,
A content of 0% improves castability and strength, particularly high-temperature strength and stress corrosion resistance, but a content exceeding 1% impairs castability.

(to) T1 is 0.0/~0. lr%, preferably 0
．． /~OJ% helps improve castability and strength, but o, r
If it exceeds %, no further effect can be seen.

(G) B is 0.00/~0. flathead, preferably 0.0
When B is added in an amount of 02 to 0, lr%, the crystal grains are refined together with T1 and Zr, and the castability and strength are greatly improved, but B alone has a similar effect. It should be noted that if the addition exceeds O or flathead, no further effect will be seen.

(f) Or is 0.0 j to 0.7%, preferably 0.7 to 0. A value of J is useful for improving strength and stress corrosion resistance, but a value exceeding 0.7 impairs castability.

('J) zr is o, ocol 0.1%, preferably 0
．． 1~0. Although it is useful for improving strength and stress corrosion resistance,
0. ! Exceeding this will impair castability.

(X) Be is 0.00/~0. /%, preferably from 0.002 to 0.07%, improves castability and strength, but if it exceeds 0.1%, no further effects can be expected.

Although the effects of each of the above additional elements can be seen even when they are added, it is preferable to add a combination of two or more strict elements such as T1 and Or, Ti, Or and Fe, or T1, C3r and Mn. Castability, strength, corrosion resistance,
Comprehensive improvements are made in terms of stress corrosion resistance, etc.

These aluminum alloys are melted according to conventional methods, but the melting temperature is selected depending on the amount or combination of additional elements, and the melting temperature is selected according to I / C. Also, since this alloy system easily absorbs hydrogen, it is degassed with chlorine gas or flux. conduct tax revenue;
It is best to perform casting after sufficient sedation and confirmation of cleanliness.

As the mold, a normal sand mold, plaster mold, ceramic mold, etc. can be used, but it is preferable to use a mold with a high cooling capacity and low moisture content, and in the case of a particularly thin wall, use a decompression method, a casting method that improves gas release, or Make sure to use a coating mold to improve the flow of the water and to avoid contamination with gases, oxides, etc.

The obtained mold had a Purinel hardness of about 7 after 77 months of casting even without heat treatment! Although the above results are obtained, when further strength is required or when strength is required in a short time, TA or Tj treatment is performed, and when distortion prevention is required, stabilization treatment is performed. After that, the final mold is finished by cutting and polishing as necessary.

Compared to conventional aluminum alloy casting molds, this mold is not only stronger, but also has (1) appropriate hardness, so it has good machinability and can be finished to a mirror finish.

(11) There are no casting defects such as pinholes or hollow spots.
Excellent pressure resistance and weldability. Furthermore, surface treatments such as alumite and Teflon coating are easy to perform.

There are also advantages.

This aluminum alloy casting mold has improved strength, so it can be used as a mold for various resin moldings, but if the wall thickness is to be thinned, the cross-sectional shape can be improved to improve rigidity if necessary. Alternatively, the durability can be further improved by using a reinforcing material.

The resin molding mold of the present invention can be widely used for molding a moderate amount of resin. That is, the raw materials can be used to mold thermoplastic resins such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, and waxes, thermosetting resins such as polyurethane, phenol resins, and epoxy resins, and rubber, and the molding method. As injection, compression, vacuum, hollow,
It can be applied to a wide variety of molding methods such as rotation, foaming, casting, and vulcanization. Among them, especially thermoplastic resin vacuum,
Suitable for hollow, rotational, and bubble molding, thermosetting resin casting, foam molding, and rubber vulcanization molding.

〔Example〕

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Example 1 The molten metal of Alloy A shown in Table 1 was degassed at f17tO℃ and settled down, and the molten metal was confirmed to be clean.
℃, cast into an organic self-hardening sand mold with a prescribed casting method and coated with a coating agent. A mold for urethane foam molding with a very thick wall was obtained.

On the other hand, a mold for a molded product having the same shape and having a wall thickness of 10 tm was obtained by casting into the conventional alloy B'i 002 sand mold shown in Table 1.

As shown in Table 1, a comparison of the mechanical properties of the two shows that the mold made from Alloy A is superior in both strength and hardness, and the mold made from Alloy A has half the burden and is more durable as well as saving energy in the production cycle. Improved.

Example The molten metal of alloy O shown in Table 1 was degassed at 7 tO ℃, tax treatment was performed, and the molten metal was confirmed to be clean.
Cast in a green sand mold with a specified casting method at ℃ 10■
Thick vacuum forming signboard mold (4LOttrm width x/,
OjOwm length Xj (7m deep) was obtained.

On the other hand, by casting the conventional zinc alloy shown in Table 1 into a sand mold,
A mold for a molded product having the same wall thickness and the same shape was obtained.

A comparison of the mechanical properties of the two is shown in Table 2, and there is no major difference. Compared to alloy molds, alloy O molds are lighter, making mold replacement more efficient, and improving the production cycle and energy savings. contributed to.

Example 3 The molten metal of Alloy E shown in Table 3 was degassed at 71.0°C, treated with tax, stabilized, and after ensuring the molten metal was cleaned, 7! O
'cVC, by using a ceramic mold with a predetermined method! Mold for patterned containers for hollow molding with OW wall thickness (mold dimensions 2 sides ≠ 00-RO x 2 sides 100m thick; external dimensions of molded product 300mm mouth Iron pipes for cooling water were surrounded and cast, and the mating surfaces were cut to create a molded product. Among them, 2 sets are F material and 3 sets are TA material.
It was used as a material.

On the other hand, the alloys shown in Table 3? A mold product with the same shape was obtained by cutting the forged side of the mold.

The mechanical properties of both are shown in Table 3, and the casting of Alloy E If4! The production period for mold A was significantly shortened, and it could be used without heat treatment, resulting in a significant reduction in mold production costs.

〔Effect of the invention〕

The resin molding mold according to the present invention fully exhibits the advantages of an aluminum alloy casting material, is compatible with the diversification of designs and variety of resin products, and also satisfies the demands for short construction period and low price. It is.

Applicant: Ryoka Light Metal Industry Co., Ltd. Agent
Patent attorney Hase - 1 other person procedural amendment (voluntary) 1 Display of case Showa AO Patent Application No. 4t9
? ! , No. 2 Name of the invention Resin molding mold 3
Person making the amendment Applicant Ryoka Light Metal Industry Co., Ltd. 4 agents 〒100 (and 1 other person) 5 Subject of amendment Contents of amendment in column 6 of “Detailed Description of the Invention” of the specification (1) Page 2 of the specification The line ``-'' has a certain meaning. ” he added.

(2) In the same page 1, line S, the text "bubbling molding" is corrected to "foaming molding."

that's all

Claims (1)

[Claims] (1) Zn is 1 to 8%, Mg is 0.5 to 6%, and the total amount of Zn and Mg is 5% or more, and Si is 0.2 to 8%.
1.5%, Fe0.2-1.5%, Cu0.2-2%,
Ni0.2-2.5%, Mn0.1-1.5%, Ti0
．． 01-0.8%, B0.001-0.2%, Cr0.
05-0.7%, Zr0.02-0.5 and Be0.0
1. A mold for resin molding, comprising an aluminum alloy casting material containing at least one additional element selected from the group consisting of 0.01 to 0.1%, with the balance being aluminum and impurities.