KR800000468B1 - Light alloy baseball bat - Google Patents

Abstract

A nickel-phosphorus alloy or nickel boron alloy layer was coated on the surface of bat by and electroless plating method, so that the repelling power of the bat may increase, and abrasion of the bat decrease. The adhesion power of the alloy layer is 5-30kg/mm2 and proved to be 5-30 times together than alumite one. The alloy layer bat was hardened at 450≰C by thermal treatment.

Description

Light alloy baseball bat

The front view which cut-out part of the baseball bat of this invention.

The present invention relates to a baseball bat made of a light alloy.

As a substitute for wooden bats, light alloy batts have superior durability and hardness compared to wooden batts, which increases repulsion and can be used to extend the flight of the ball to a long distance. The one with the highest strength in the light alloy was used. It is also common that the surface of the light alloy suitable for the bat is plated with hard alumite to prevent corrosion.

The batting of the present invention is a light alloy suitable for the manufacture of conventional light alloy bats in consideration of strength and economy, and forging and heat treating an aluminum alloy, especially a durdumin-based alloy, has a Vickers hardness of about 110. -130, heat resistance nickel having a high hardness on the surface of the bat of the present invention to increase the repelling force and to reduce the wear of the bat by batting in comparison with light alloy bats of more than 30kg / mm ² , and elongation of 14% or more elongation An alloy coating of phosphorus or nickel-boron is coated.

Nickel-phosphor or nickel-boron alloy itself has Vickers hardness of 450 or more, but when heat treated, its Vickers hardness is 940 or more and has the largest hardness among alloys. Therefore, this alloy coating forms a hardened layer on the batt surface. The instantaneous repulsion can be increased.

However, the purpose of increasing the surface hardness alone is the Vickers hardness of about 500 with only the above-mentioned alumite coating layer, but the alumite is not ductile and the adhesion is 1kg / mm ² , whereas in the alloy plating layer of the present invention, the adhesion is alumite. It is 5-30kg / mm ^{2, which} is very good compared to the adhesive force of. In other words, when the ball hits the bat, the alumite coating tends to be easily peeled off from the batter's alloy base because the adhesion is weak. Nickel-phosphorus or nickel-boron alloys are ideal as a coating material for alloy batt because their metal properties are not lost, their hardness is high and the adhesion is excellent.

Electroless plating and general electroplating techniques can be used to make the bat of the present invention. The heat treatment is carried out at temperatures up to 450 ° C. after plating. However, when it is necessary to increase the hardness, the hardness increases with the temperature rise, thereby increasing the heat treatment temperature.

In the accompanying drawings, a part of the baseball bat according to the present invention is cut out and marked, 1 denotes a light alloy base material of the bat, 2 a nickel-phosphor or nickel-boron alloy coating layer of surface plating, and 3 a hollow inside of the bat. .

Examples of the bat of the present invention manufactured according to the electroless plating method are as follows.

EXAMPLE

Duralumin-based alloys formed from bat-based materials are subjected to pretreatment such as trichlene degreasing, acetic acid washing, aluminum substitution, and washing with water, and then electroless plating is performed by infiltration in the following electroless plating bath.

In each plating bath, the bat substrate (hardness 120 Hv, tensile strength of 40 kg / m and heat treated dururamin having an elongation of 15%) is deposited to be plated under the following conditions.

The plated as described above was washed with water, dried at 120 ° C., heated at 220 ° C. and 400 ° C. for 1 hour, and then cooled slowly for 10 hours. The following table shows the physical properties of the plating layers treated in the plating baths (1) and (2) as already mentioned.

In addition, the peeling resistance and impact resistance (indicated by scratch) of the batt produced by the method of the present invention is experimental data as follows.

(1) Nickel-phosphorus plating bat of the present invention not subjected to heat treatment

(2) Nickel-phosphorus plating bat of the present invention heat-treated at 120 ° C

(3) Light alloy bats, not plated on the market

(4) Electrolytic lamp plating, commercially available light alloy bats with a thickness of 50μ

For the four types of bats, baseball oral pitches were thrown at 10-second intervals consecutively at intervals of 2 seconds on the bat centerline at a rate of 50 m / sec.

Here, the minimum number of pitches of peeling and surface wound development was as follows.

Claims (1)

As described above in the text, a light alloy baseball bat characterized by plating a nickel-phosphorus or nickel-boron alloy on the surface and hardening the plating layer by heat treatment.

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