JPS6059047A - Pin for extruding reinforced plastic - Google Patents

Abstract

PURPOSE:To obtain the titled pin having strength, toughness, high wear resistance, satisfactory seizing resistance and dimensional stability by subjecting a worked steel material having a specified composition consisting of C, Si, Mn, Cr, Mo, V and Fe to hardening and tempering each at a proper temp. CONSTITUTION:A steel rod consisting of, by weight, 0.90-1.10% C, 0.1-0.5% Si, 0.1-1.0% Mn, 11.0-13.0% Cr, 0.7-1.3% Mo, 0.1-0.6% V and the balance Fe with few impurities is worked to a prescribed shape, quenched from about 1,030 deg.C, and tempered at about 520 deg.C to obtain a pin for extruding reinforced plastics contg. glass fiber, metallic powder or the like. The pin is so strong and tough as to prevent breaking during use, the sliding surface has high wear resistance and satisfactory seizing resistance, and the pin causes no dimensional change during long-time use.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extrusion pin used in a molding device for reinforced plastics to which glass fiber, metal group powder, etc. are added.

As an extrusion bottle for plastic, it broke during use.

In addition to having sufficient toughness to prevent corrosion, high abrasion resistance of the sliding motion, and excellent seizure resistance, it is also required that dimensional changes do not occur during long-term use.

Conventionally, the general plastic extrusion bottle was 5KS2.
/ is quenched at about 30℃, then tempered at 0 to 200℃,
Products with a hardness of around HRO60 are widely used, but when the working temperature during plastic molding is around 200°C, SKS 2 / extrusion bottles have a hardness after long use.
BKD//M extrusion bottles are used for reinforced plastics because they have the drawback of expansion and, in the case of reinforced plastics containing glass fibers, lack abrasion resistance.

+3KD/ / is a/, 3%, 0r72%, MQ /
%, Vo, and 3%. HRC! It has a hardness of about 100 ml, and because of the presence of hard M7C3 carbides in the martensitic matrix, it has very high wear resistance and good dimensional stability.

However, due to the lack of toughness, relatively small diameter extrusion pins have the disadvantage of causing breakage during use.

The present invention has been made in view of these problems, and is
The purpose of this product is to provide an extrusion pin that has superior toughness and moderate abrasion resistance than extrusion pins made by KD//, and is suitable for molding reinforced plastics containing glass fiber, etc. .

That is, the main 8A has a M button width, a O,70~/,1
0, si O,/~OJ%, MnO,7~
/, 0'ly, ar//, 0~/3.0%, MOθ,
After processing a steel rod consisting of 7~/, 3%, vO9/~04ch balance iron and some impurities into a predetermined shape, approximately 7
Quenched from a temperature of 030℃ and continued @! It is an extrusion pin for reinforced plastics that is characterized by being tempered at a temperature of around 20℃, and has significantly superior toughness than extrusion pins made by SKD/ /, and has the wear resistance of SKD. //This is a slightly inferior variant to the pin made, 5Ks2/
Much better than made bottles. Also, the tempering temperature is approx. ;Since the temperature is as high as 20°C, there is no dimensional change during use even at working temperatures of around 200°C. Therefore, the extrusion pin of the present invention is suitable for use as an extrusion pin for reinforced plastics containing glass fibers.

Next, to clarify the reason for limiting the composition of the extrusion pin of the present invention, C
increases the hardness of martensite and combines with Qr to form M7C
Forms type 3 hard carbide to improve wear resistance, but C
When C is less than 0 and 0'4, the wear resistance is insufficient, and C is less than 0'4.
If it exceeds 10, the toughness decreases, so 0, ri 0~/, 10
Seven. si is added as a deoxidizing agent, but 0.7"
If it is less than 4%, the effect will be small, and if it exceeds 0.5%, decarburization will occur easily, so it was limited to 0.1 to 0.5%. Mn
Also has a deoxidizing effect, but 0. If it is less than /,%, the effect will be small and the amount of retained austenite during quenching will increase, which exceeds /,0. Qr forms a hard carbide, improves wear resistance, and has the effect of reducing tempering softening resistance kB, but if it is less than 0'4, the wear resistance will be insufficient, and if it exceeds 73, it will cause quenching hardness. Since the height decreases, it is set to 0 to 3.0 inches. MO has the effect of increasing hardenability and temper softening resistance, but if it is less than 0.7 inch, the air hardenability is insufficient, and if it exceeds 7.3%, there is little improvement in the effect. 0.7~/, 34. Next, (2) has the effect of refining crystal grains and causing secondary hardening during tempering, but 0. If it is less than θ4, the effect will be small, and if it exceeds θ4, the toughness will decrease, so 0. /
~0.6'4.

Hereinafter, the effects of the present invention will be explained using examples.

Table 1 shows the chemical compositions of the extrusion pin of the present invention and the conventional extrusion bottle. In the table, symbol A is the extrusion pin of the present invention, symbol B is SKD
i/II! Extrusion bottle, symbol C indicates an extrusion bottle made by 5KSJ/.

Table 1 Chemical Composition Next, a straight bottle with a diameter of 10 mm that has the chemical composition shown in Table 1 and has been heat treated as shown in Table 1 is used as an extrusion pin for a reinforced glass mold containing glass fiber. As a result, the pin made by E3KD// of sample B broke under the collar part at the trial shot stage, but the extruded pin of the present invention did not break at all, and so, ooo
Even after the shot, no abnormalities were observed in wear or dimensional changes.

The extrusion pin of the present invention is 0090~
/, 10S, 8iθ/~θj4, Muθ/~/, 8, C
r/10~/3,04, Mou7~73%, vL7/~
SKD
It has significantly better toughness than extruded pins made by /, so there is no risk of breakage, and its wear resistance is on par with SKD.
//It is almost the same as Bottle 6, and is most suitable as an extrusion bottle for glass fiber-containing reinforced plastics.

that's all Representative patent attorney Izawa Tao°−.

fish-1-1,1

Claims (1)

[Claims] In terms of weight, c O, ri o-i, io'4, S1θ, /~
O, S, Mn O, / ~/, 04, Cr //, 0
~/3.0'4, MOo, 7-7.3%, vO6/~
After processing a steel bar made of residual iron and some impurities into a ship-specified shape, it is heated to 7030 degrees Celsius with phosphorus,
An extrusion bottle for reinforced plastics, characterized in that the bottle is heated and subsequently tempered at a temperature of around 520°C.