JP3605365B2 - Powder release lubricant supply mechanism - Google Patents

Description

【００２４】
（比較例）
従来の供給方法によるものである。即ち、上記実施例の鋳造機において第１供給手段４が無く第２供給手段５のみによって粉体離型潤滑剤を供給し、鋳造を行った。上記実施例における各条件の内、粉体離型潤滑剤の１ショット当りの平均吐出量を１．９ｇとし、その他は同じとした。
【００２５】
なお、実施例における平均吐出量は、本鋳造製品の形状、プランジャーチップ径、及びプランジャー速度などを考慮して、多数の実験や検証の結果に基づいて、設定した。また、比較例における平均吐出量は、本鋳造製品、プランジャーチップ径、及びプランジャー速度における基準量である。
【００２６】
実施例及び比較例における不具合の発生程度は、表１に示すようになった。
【００２７】
【表１】

【００２８】
表１から分かるように、比較例即ち従来の方法に比して、実施例即ち本発明の方法によれば、「焼付き」及び「離型不足による型残り」が無く、従って、キャビティ１３における離型性が満たされており、また、「湯道付近における粉体離型潤滑剤の堆積」が無く、従って、スリーブ２１における潤滑性が満たされている。
【００２９】
【発明の効果】
請求項１記載の発明によれば、キャビティ内へ第１供給手段によって充分量の粉体離型潤滑剤を供給でき、スリーブ内へ第２供給手段によって充分量の粉体離型潤滑剤を供給できる。従って、キャビティにおける離型不足及びスリーブにおける潤滑不足を解消できる。しかも、粉体離型潤滑剤をキャビティ内及びスリーブ内へ確実に供給できるので、１ショット当りの粉体離型潤滑剤の総使用量（キャビティ分及びスリーブ分）を従来の方法に比して低減できる。
【００３０】
請求項２記載の発明によれば、第１供給手段によって離型性の良好な粉体離型潤滑剤をキャビティ内に供給できるので、キャビティにおける離型性を充分に満足できるものにでき、また、第２供給手段によって潤滑性の良好な粉体離型潤滑剤をスリーブ内に供給できるので、スリーブにおける潤滑性を充分に満足できるものにできる。
【図面の簡単な説明】
【図１】本発明の粉体離型潤滑剤供給方法を実施する供給機構を備えた鋳造機を示す縦断面図である。
【図２】図１の部分Ａの拡大図である。
【符号の説明】
３ 減圧手段
４ 第１供給手段
５ 第２供給手段
１３ キャビティ
２１ スリーブ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to supply mechanism you feed the powder mold releasing lubricant into the cavity and within the sleeve mainly in die casting operation.
[0002]
[Prior art]
In order to further reduce the defective rate of the cast product and achieve higher quality and cost reduction, inorganic compounds recently proposed in JP-A-3-243242 and JP-A-4-279242 have been proposed. Powder release lubricants having as a main component are increasingly used. According to such a powder release lubricant, seizure, poor run-off, internal defects due to water residue when using a water-soluble release agent, and gas entrapment when using an oil-based plunger oil It is possible to eliminate a defect such as a defective internal defect.
[0003]
Conventionally, the powder release lubricant has been supplied as follows. That is, the powder release lubricant is supplied to the inside of the sleeve from the hot water supply port of the sleeve and also to the inside of the cavity through the sleeve after the inside of the cavity and the inside of the sleeve are decompressed with the mold closed. I was
[0004]
[Problems to be solved by the invention]
However, in the conventional supply method described above, the powder release lubricant supplied from the hot water supply port preferentially attaches to the inner surface of the sleeve by detecting the temperature of the inner surface of the inner surface of the sleeve by the adhesion contributing component in the powder release lubricant. It adhered and was not sufficiently supplied into the cavity, and therefore, there was a possibility that insufficient release would occur.
[0005]
Further, the releasability required in the cavity and the lubricity required in the sleeve depend on the casting conditions such as the shape of the cast product and the plunger speed. Since the same powder release lubricant is supplied to the mold, there is a possibility that the releasability is satisfied but the lubricity is not satisfied, or vice versa.
[0006]
The present invention is also within the cavity as well as the sleeve, and an object thereof is to provide a supply mechanism that can be sufficiently supplied the powder mold releasing lubricant.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a mechanism for supplying a powder release lubricant into a cavity and a sleeve in a casting operation, a pressure reducing means for reducing the pressure in the cavity and the sleeve, and a powder release lubricant in the cavity. a first supply means for supplying comprises a second supply means for supplying a powder mold releasing lubricant into the sleeve state, and are not the first supply means and second supply means is independently Wherein the first supply means includes a valve chamber to which a supply passage for supplying the powder release lubricant communicates, and an opening / closing valve, and the opening / closing valve connects or disconnects the valve chamber and the cavity. Or to do so.
[0010]
According to a second aspect of the present invention, in the first aspect, each supplying a powder mold releasing lubricant by the first supply means and second supply means are those those separate.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a longitudinal sectional view showing a casting machine provided with a supply mechanism for carrying out the powder release lubricant supply method of the present invention. The casting machine includes a mold 1, a molten metal injection unit 2, a decompression unit 3, a first supply unit 4, and a second supply unit 5. The supply mechanism includes a decompression unit 3, It is composed of a first supply unit 4 and a second supply unit 5. The first supply means 4 and the second supply means 5 are independent and independent, and operate independently and independently.
[0012]
The mold 1 includes a fixed mold 11 and a movable mold 12. When the two molds 11 and 12 are combined, a cavity 13 and a runner 14 are formed on the mating surface.
[0013]
The molten metal injection means 2 includes a sleeve 21 that penetrates the fixed mold 11 and a plunger 22 that slides inside the sleeve 21. The molten metal supplied from the hot water supply port 23 into the sleeve 21 is supplied to the plunger tip 221. , And is supplied into the cavity 13 through the runner 14.
[0014]
The decompression means 3 has a vacuum pump 31 and a vacuum tank 32, and decompresses the inside of the cavity 13 through a vacuum passage 33. 34 is a vacuum shutoff valve.
[0015]
The first supply means 4 supplies a powder release lubricant from the powder discharger 41 to the cavity 13 through the powder supply passage 42. As the powder release lubricant supplied by the first supply means 4, a lubricant having good release properties is used. The powder supply passage 42 communicates with the cavity 13 via an opening / closing valve 43 as shown in FIG. 2, which is an enlarged view of a portion A in FIG. FIG. 2A shows a state where the open / close valve 43 is open, and FIG. 2B shows a state where the open / close valve 43 is closed. The supply port 421 at the tip of the powder supply passage 42 is open to the valve chamber 44. The valve chamber 44 communicates with the cavity 13 when the open / close valve 43 advances, and communicates with the cavity 13 when the open / close valve 43 retreats. Is cut off. The opening and closing valve 43 is moved forward and backward by a pneumatic or hydraulic cylinder mechanism 45. The number and position of the powder supply passages 42 are set in consideration of casting conditions such as the shape of the cast product and locations where seizure is likely to occur. Further, the powder discharger 41 suctions and discharges the powder release lubricant contained in the container by discharge air flowing through the ejector tube.
[0016]
The second supply means 5 includes an attachment 51 and a powder discharger 52, and supplies the powder release lubricant from the powder discharger 52 to the sleeve 21 through the nozzle 521. As the powder release lubricant supplied by the second supply means 5, a lubricant mainly composed of graphite and having good lubricity is used. The attachment 51 is provided so as to be movable in a horizontal direction and a vertical direction by a driving device (not shown). is there. The attachment 51 is a double-walled thick disk having a main body 511 and a contact portion 512. The main body 511 is made of aluminum, and the contact portion 512 is made of silicone rubber. A contact portion 513 of the 512 with the hot water supply port 23 is formed in a tapered shape.
[0017]
The powder discharger 52 discharges a powder release lubricant from the nozzle 521 together with air. The air discharge pressure and volume are adjustable. The nozzle 521 is made of a copper pipe, and is provided to protrude downward from the contact portion 512 of the attachment 51. The nozzle 521 can be adjusted to any length by cutting a copper pipe.
[0018]
The casting machine provided with the supply mechanism having the above configuration operates as follows.
As shown in FIG. 1, the molds 11 and 12 are closed, and the attachment 51 is moved by a driving device so as to abut the hot water supply port 23 so as to close the hot water supply port 23. In this state, the pressure reducing means 3 is operated. Thus, the pressure inside the cavity 13 and the inside of the sleeve 21 are reduced. When the predetermined pressure reduction is reached, the operation of the pressure reduction means 3 is stopped. In this state, the first supply means 4 and the second supply means 5 are operated. That is, in the first supply means 4, the opening and closing valve 43 is opened as shown in FIG. Thereby, the powder release lubricant is supplied into the cavity 13 through the powder supply passage 42 and is applied to the inner surface of the cavity 13. On the other hand, in the second supply means 5, the powder discharger 52 is operated. As a result, the powder release lubricant is supplied into the sleeve 21 through the nozzle 521, and is applied to the inner surface of the sleeve 21.
[0019]
When the supply of the predetermined amount of the powder release lubricant in each of the first supply unit 4 and the second supply unit 5 is completed, the operations of the first supply unit 4 and the second supply unit 5 are stopped, and (B) of FIG. The closing valve 43 is closed as shown in FIG. Then, the attachment 51 is moved to open the hot water supply port 23, the molten metal is supplied from the hot water supply port 23 into the sleeve 21, and the plunger 22 is advanced to supply the molten metal to the cavity 13 through the runner 14. Then, after molding, the two dies 11 and 12 are opened to take out a cast product.
[0020]
In the supply method using the supply mechanism having the above configuration, the first supply means 4 and the second supply means 5 operate independently and independently, so that a sufficient amount of powder is separated into the cavity 13 by the first supply means 4. The mold lubricant is supplied, and a sufficient amount of the powder release lubricant is supplied into the sleeve 21 by the second supply means 5. Therefore, insufficient release from the cavity 13 and insufficient lubrication from the sleeve 21 do not occur.
[0021]
In addition, since the powder release lubricant having good releasability is supplied into the cavity 13 by the first supply means 4, the releasability in the cavity 13 can be sufficiently satisfied. Since the powder release lubricant having good lubricity is supplied into the sleeve 21 depending on the means 5, the lubricity of the sleeve 21 can be sufficiently satisfied.
[0022]
Note that the powder release lubricant supplied by the first supply means 4 and the powder release lubricant supplied by the second supply means 5 may be the same.
[0023]
【Example】
(Example)
In the casting machine having the configuration of the above embodiment, a powder release lubricant was supplied and casting was performed under the following conditions.

[0024]
(Comparative example)
This is based on a conventional supply method. That is, in the casting machine of the above-described embodiment, the powder release lubricant was supplied only by the second supply means 5 without the first supply means 4, and casting was performed. Of the conditions in the above example, the average discharge amount of the powder release lubricant per shot was 1.9 g, and the other conditions were the same.
[0025]
The average discharge amount in the examples was set based on the results of numerous experiments and verifications, taking into account the shape of the cast product, the plunger tip diameter, the plunger speed, and the like. The average discharge amount in the comparative example is a reference amount in the present cast product, plunger tip diameter, and plunger speed.
[0026]
Table 1 shows the degree of occurrence of defects in Examples and Comparative Examples.
[0027]
[Table 1]

[0028]
As can be seen from Table 1, according to the embodiment, ie, the method of the present invention, there is no “seizure” and “the remaining mold due to insufficient release” as compared with the comparative example, ie, the conventional method. The releasability is satisfied, and there is no "accumulation of the powder release lubricant near the runner", and the lubricity of the sleeve 21 is satisfied.
[0029]
【The invention's effect】
According to the first aspect of the present invention, a sufficient amount of powder release lubricant can be supplied into the cavity by the first supply means, and a sufficient amount of powder release lubricant can be supplied into the sleeve by the second supply means. it can. Therefore, insufficient mold release in the cavity and insufficient lubrication in the sleeve can be resolved. In addition, since the powder release lubricant can be reliably supplied into the cavity and the sleeve, the total amount of the powder release lubricant used per shot (for the cavity and the sleeve) can be reduced as compared with the conventional method. Can be reduced.
[0030]
According to the second aspect of the present invention, since the first supply means can supply the powder releasing lubricant having good releasability into the cavity, the releasability in the cavity can be sufficiently satisfied. In addition, since the powder releasing lubricant having good lubricity can be supplied into the sleeve by the second supply means, the lubricity of the sleeve can be sufficiently satisfied.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a casting machine provided with a supply mechanism for performing a powder release lubricant supply method of the present invention.
FIG. 2 is an enlarged view of a portion A of FIG.
[Explanation of symbols]
3 decompression means 4 first supply means 5 second supply means 13 cavity 21 sleeve

Claims (2)

In the mechanism for supplying the powder release lubricant into the cavity and the sleeve in the casting operation,
Decompression means for decompressing the inside of the cavity and the inside of the sleeve,
First supply means for supplying a powder release lubricant into the cavity;
Second supply means for supplying a powder release lubricant into the sleeve,
All SANYO that the first supply means and second supply means is independently,
The first supply means includes a valve chamber to which a supply passage for supplying the powder release lubricant communicates, and an opening / closing valve, and the opening / closing valve connects or disconnects the valve chamber and the cavity. adapted or powder mold releasing lubricant supply mechanism, characterized in that. The powder release lubricant supply mechanism according to claim 1 , wherein the powder release lubricant supplied by the first supply means and the powder supply lubricant supplied by the second supply means are separate.

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