JPS596722B2 - Manufacturing method of aluminum↓-lead alloy flat plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides At-P
The present invention relates to a method for manufacturing a flat plate of b alloy.

Bearings such as automobile engine bearings contain C.
Although u-Pb and kl-Sn alloys have been used, there is a tendency for At-Pb alloys to be used from the viewpoint of characteristics.

However, in At-Pb alloys, pb is almost At
Because it does not dissolve in solid solution, it is impossible to manufacture it by normal casting methods, and it is common to create a powder and sinter it to make a flat plate.

The present invention provides an inexpensive and technically easy manufacturing method for At-Pb alloy flat plate material, and employs direct, chill, and well-known At alloy casting methods.
Unlike casting (hereinafter referred to as the DC method) and continuous casting and rolling methods (hereinafter referred to as the Propelch method), which are typified by the Properch method, which is composed of a rotary casting wheel and an endless belt,
This is a method for producing an At-Pb alloy using At alloy powder as a raw material by a rapid solidification method that allows solute elements to be dissolved in solid solution in a larger amount than in the above two methods.

The DC method provides a cooling rate of 0.5-20°C/sec, the Properch method provides a cooling rate of approximately 0.5-10°C/sec, but the water atomization method provides rapid cooling at a cooling rate of 102-103°C/sec. The present inventors confirmed that a solidified material was obtained and the solid solubility limit of the solute element was significantly increased.
No. 9, applied to the continuous extrusion method shown in JP-A No. 49-65369, a large amount of solute elements dissolved in solid solution are finely precipitated and dispersed during extrusion to continuously produce At-Pb alloy flat plates with excellent lubricity. It was discovered that it can be manufactured at low cost.

As mentioned above, the present invention is directed to pb, which is a solute element in At.
At-Pb with excellent lubricity, with a large amount and finely dispersed
The object of the present invention is to provide a method for manufacturing alloy flat plates inexpensively, easily, and continuously.

The present invention provides a method for producing a flat plate by extrusion from an At-Pb alloy powder containing 6 to 20 Pb, including (a)
(b) using an extrusion device in which a conduit is formed by a driving wall surface and a fixed wall surface having a smaller area, and the rear end of the conduit in the driving direction is substantially closed; (b) the front end of the conduit; A7-P rapidly solidified from
b) Continuously supplying the alloy powder, (c) The alloy powder is continuously fed into the pipe by the frictional force of the driving wall surface toward the extrusion die provided at the rear end of the pipe, and is extruded. By applying power and continuously extruding it into a wire rod, (d) The heat generated by friction and processing in the tube and the extrusion force cause the At alloy powder to be metallurgically bonded to each other, and a large amount is solidified during rapid solidification. The dissolved PB is finely divided into At
This is a method for producing an aluminum-lead alloy flat plate characterized by improving lubricity by precipitating and dispersing the aluminum-lead alloy in the aluminum-lead alloy.

In the present invention, the Pb amount was specified as 6 to 20% because
This is because if it is less than 6%, the lubricity is poor, and if it exceeds 20%, a uniform dispersion state of Pb cannot be obtained and the lubricity is saturated.

Hereinafter, the present invention will be explained by examples using the drawings.

Example 1 An alloy having the composition shown in Table 1 was melted in pure At with a purity of 99 cm using a simple substance of PB, and the melt was melted at I kg/sec from the bottom of the mold.
At the same time, the alloy is dropped at a speed of l! At-Pb alloy powder was prepared by spraying water at a rate of l/sec.

In this case, the temperature of the molten metal in the crucible was set to be 50° C. above the birth phase line.

The figure is a sectional view illustrating a continuous extrusion device used in an example of the present invention.

In the figure, reference numeral 1 denotes a thick disc-shaped drive wheel driven in the direction of the arrow, and grooves 2 are provided on the outer peripheral surface of the wheel so that At--Pb alloy powder can be continuously supplied.

A fixing restrainer 4 is provided in contact with a part of the outer peripheral surface of the wheel 1.

A drive wall surface 3 on the inner surface of the groove 2 of the wheel 1 and a fixed restraint 4
A conduit is formed by the fixed wall 5 on the inner surface of the pipe.

A protrusion 6 is provided at the inner rear end of the fixing restrainer 4 to close the rear end opening of the conduit.

The At=Pb alloy powder 8 continuously supplied from the powder supply tool 7 provided at the opening of the conduit advances toward the protrusion 6 due to the frictional force of the driving wall surface 3, and pressure is applied. Extrusion force is applied.

The alloy powder 8 subjected to pressure is extruded from an extrusion die 9 provided at the rear end of the conduit.

The temperature of the alloy powder 8 increases due to friction with the fixed wall 5, heat generated during extrusion, etc., and the temperature increases due to friction pressure,
At the same time as metal bonding progresses due to extrusion pressure, solute elements dissolved in solid solution precipitate and become finely dispersed due to the effects of temperature and processing.

Processing heat generation depends on processing conditions such as extrusion ratio and extrusion speed, so the temperature at which solute elements precipitate and are finely dispersed,
The processing conditions may be selectively adjusted to 400 to 600°C.

The above-mentioned A7-Pb alloy powder was continuously charged from the front end of the pipe line of this device, and the extrusion ratio was 80 and the extrusion speed was 400 m/min.
Continuous extrusion was carried out for 1 minute to obtain a plate material of 2 strips x 10 rirn.

Bearing parts are made from the AA-Pb alloy plate material made in this way, and the At-S
Comparing the wear amount with that of n alloy, the AI shown in Table 1
, 2, 3 are At-Pb alloys, At-Sn
The results were 20%, 7%, and 5%, respectively, much better than those of alloys.

The extrusion device used in the present invention is not limited to the continuous extrusion device using a grooved drive wheel as shown in the figure, for example, but also the device shown in JP-A-50-133153, that is, a continuous extrusion device using a grooved drive wheel as shown in the figure. A drive wall surface consisting of two drive caterpillars that are held parallel and pressed upward and downward, respectively, and a U-shaped fixed container whose both sides are in contact with the parallel parts of the caterpillars, which have an area larger than the drive wall surface. A conduit is formed with a fixed wall surface consisting of both small side surfaces, the rear end of the conduit in the driving direction is closed at the bottom of the fixed container, and the front end opening of the conduit is used as an insertion port for alloy powder. A continuous extrusion device may also be used.

As described above, the method of the present invention uses rapidly solidified At-Pb alloy powder produced by water atomization, for example, as a material to be supplied to a continuous extrusion device,
It is possible to finely precipitate and disperse solid solute elements by raising the temperature due to frictional heat and processing heat during extrusion, providing excellent lubricity, and making it easy to manufacture long objects at a low cost. It has the effect of being able to be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a sectional view illustrating a continuous extrusion device used in an embodiment of the present invention. 1... Drive wheel, 2... Groove, 3.
... Drive wall surface, 4 ... Fixed restraint, 5.
... Fixed wall surface, 6 ... Protrusion, 7 ...
...Thank you for supplying the powder, 8...At alloy powder, 9...
...Extrusion die.

Claims (1)

[Claims] A method for manufacturing a flat plate by extrusion from an At-Pb alloy powder containing IPb6 to 20, comprising: (a) a conduit is formed by a driving wall surface and a fixed wall surface having a smaller area; Using an extrusion device in which the rear end of the pipe in the driving direction is substantially closed, ω) Continuously supplying rapidly solidified At-Pb alloy powder from the front end of the pipe, (c) The alloy powder is continuously fed into the pipe by the frictional force of the driving wall surface toward an extrusion die provided at the rear end of the pipe, and is continuously extruded into a plate by applying an extrusion force. ((1) The heat generated by the friction and processing in the tube and the extrusion force cause the A7 alloy powder to be metallurgically bonded, and a large amount of PB dissolved in solid solution during rapid solidification is finely precipitated and dispersed in the A7. 2. The method for manufacturing an aluminum-lead alloy flat plate according to claim 1, wherein the At-Pb alloy powder is a powder produced by a water atomizer method.