JP2000212800A - Plating method of piercing needle, and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily impart a smooth plating free from unevenness on a slender and light piercing needle by fixing a plurality of baskets storing a large number of piercing needles to a rotary shaft provided with an energization passage, and rotating the rotary shaft in a plating solution in an inclined condition relative to the level of the plating solution. SOLUTION: A rotary shaft F' is inserted in a plating solution C' stored in a plating bath B' in an inclined condition. The angle of inclination is 90 deg. or under relative to the level of the plating solution. A plurality of baskets m are fixed to a lower end of the rotary shaft F', a large number of piercing needles are placed in the baskets, and electrically connected to a energization bar built in the rotary shaft F' to form a cathode through a copper plate for energization in contact therewith, a bolt N, a plate O for energization, etc., and the plating current is allowed to run between the cathode and an anode E' arranged in the plating solution parallel to a basket part M. The rotary shaft F' is rotated by the power L. The piercing needles in the basket m are easily moved while sliding down one by without entangling with each other to obtain the excellent plating free from any uneven plating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for plating a perforated needle.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a horizontal barrel plating apparatus (hereinafter referred to as barrel plating) is generally used for mass-producing metal pieces of small parts such as machinery and equipment. It is. In this apparatus, a plating solution C is put into a plating tank B, a large number of metal pieces A are put into a barrel D immersed in the plating solution C, and turned from the anode E of the anode to the cathode in the barrel D while rotating. Metal piece A in contact with energizing bar F
, And plating is performed.

At this time, as shown in FIG. 2, the movement of the metal piece A is carried upward in the barrel D with the rotation of the barrel D, and it is lowered from a certain position to form a certain slip layer G. While moving, the metal pieces A are rubbed together and slid down, during which plating is performed on the surface layer portion I. Further, the descending state of the surface layer portion I is such that the metal piece A moves so as to fall down and slide down in order during rotation of the barrel D, and by repeating this, plating is applied to the surface of the metal piece A, and the hardness of the metal piece A is reduced. Improves and prevents rust.

However, as shown in FIG. 3, when a thin and light metal piece such as a perforated needle is plated by barrel plating, the behavior of the perforated needle A ′ with the rotation of the barrel D depends on the barrel rotation J direction. When transported upward and turning downward, the perforated needles A 'are entangled and agglomerated, so that no slip layer is formed, and the individual perforated needles A' cannot move while sliding down, forming a group K. Will move.
As a result, intermittent plating occurs, and furthermore, the perforated needle A ′ in the central portion of the group K that is aggregated is not exposed to the surface layer portion, resulting in poor plating.

[0005] Further, a portion where the perforating needles A 'are entangled and in contact with each other is not exposed as a surface layer portion, and there is a portion where plating does not adhere, and plating unevenness occurs. As a result, irregularities are generated on the surface of the perforating needle A ', and when the stamping paper is perforated with the perforating needle A', burrs are generated on the paper, the paper is hardly removed, and shearing in an ideal shape is performed. Often not. However, when the stamp printing paper is perforated with the perforating needle A ′, a shearing accuracy with high smoothness is required. Therefore, a method of applying plating with higher smoothness and uniformity is required.

[0006]

SUMMARY OF THE INVENTION The present invention overcomes the unresolved points described in the prior art and can easily apply plating to a thin and light metal body such as a perforated needle. The purpose is to:

[0007]

In order to achieve the above object, at least one basket provided with an energizing means for energizing a perforated needle, means for fixing the at least one basket to a rotating shaft, A plating device including a rotating unit that inclines and rotates the rotation axis at an angle smaller than the vertical with respect to the surface of the plating solution and an energization unit in which the rotation axis also serves as an energization path for plating, the basket is inclined at a certain inclination angle. The plating is performed while rotating.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the following drawings. An inclined barrel plating apparatus was prepared as a dedicated plating apparatus for a perforated needle. As the plating method,
Although a chromium plating method is taken as an example, other methods such as nickel plating and copper plating are also possible. As shown in FIG. 4, the inclined barrel device includes a plating tank B ′, a power unit L, an anode E ′, and a basket M. The plating tank B 'is made of FRP, and the inside thereof is coated with Teflon to prevent corrosion by additives in the plating solution C'. The power section L is disposed at the upper end of the rotation axis F ′, and rotates the basket section M and simultaneously functions as a cathode.

A basket M is provided at a lower end of the rotating shaft F '. The basket M is provided with a basket m for inserting a perforated needle, an energizing plate O for energizing each basket m, and a bolt N for energizing the back to front surface of each basket m. Further, as shown in FIG. 5, an anode E ′ of a lead plate serving as the anode E ′ is attached from the outside of the plating tank B ′ in parallel with each basket m, and is fixed and energized. On the other hand, the rotating shaft F ′ is a brass energizing bar P
And the surface is covered with vinyl chloride Q.

As shown in FIG. 6, a basket M is formed by fixing four identical octagonal prism baskets m to a rotation axis F ′.
Electric power is supplied to the front surface by the bolt N from the rotation axis F ′ through the back surface of each basket M. Bolt N energized on the surface
Through, a copper plate R for current supply is radially provided. The side and bottom surfaces of each basket m are made of a vinyl chloride plate with a number of small holes.

Approximately 50 perforating needles are put into each basket m, and each basket m also rotates with the rotation of the rotation axis F 'to perform plating. In addition, the inclination angle of the basket M is 45 degrees, and the rotation speed is 2 to 4 rpm. The behavior of the perforating needle in each basket m by this method and device is as follows:
Because it moves at a low speed and with a small amount, there is no entanglement between the perforating needles, and since each one moves while sliding down, intermittent plating does not occur, plating unevenness and the like are eliminated, and good plating is realized. it can.

The composition of the barrel plating solution is usually 230 to 250 g / l of chromic anhydride and 1.5 to 2.2 g of sulfuric acid.
/ L, trivalent chromium 2.2 g / l Sargent bath is used. However, the composition of the plating solution of the inclined barrel plating apparatus is such that strontium sulfate 9 g / l and potassium silicofluoride 20 g / l are added to chromic anhydride 300 g / l.
1 fluorination bath. The reasons for adding additives are hardness,
The liquid composition was improved to improve smoothness and gloss and to prevent plating failure even if intermittent plating occurs. As a result, plating with more gloss and smoothness can be provided.

[0013]

According to the present invention, even with a thin and lightweight metal body such as a perforated needle, plating unevenness does not occur, and the perforated needle surface can be plated with smoothness and high gloss. As a result, when the paper is sheared with the perforating needle, a sharp cut surface is obtained, and the perforation finish of the paper becomes better. Further, since the plating unevenness and the roughness of the metal surface were eliminated, the yield after the plating was further improved.

Further, Table 1 shows the results of investigations of a perforated needle, a quenched needle, and a continuous number of perforations when plated by the method of the present invention. As the plating method according to the present invention, the plating time is 30 minutes, 1 hour, 2 hours,
Although it was performed in three hours, the number of perforations lasting when plating was performed in two hours was remarkably improved to 170,000 to 200,000 times.

[Table 1]

[Brief description of the drawings]

FIG. 1 is a side view of a barrel plating apparatus.

FIG. 2 is a front view of the barrel plating apparatus.

FIG. 3 is a front view of a barrel plating apparatus.

FIG. 4 is a side view of the inclined plating apparatus.

FIG. 5 is an explanatory view of an anode part of the inclined plating apparatus.

FIG. 6 is an explanatory view of a basket portion of the inclined plating apparatus.

[Explanation of symbols]

 A Metal piece A 'Piercing needle B Plating tank B' Plating tank C Plating solution C 'Plating solution D Barrel E Anode and add E' Anode and anode F Cathode and current bar F 'Cathode G Sliding layer I Surface layer J Barrel rotation direction K A group of perforated needles L Power M Basket part m Basket N Bolt O Current plate P Brass bar Q Vinyl chloride R Copper plate

Claims (2)

[Claims] At least one basket provided with an energizing means for energizing a perforating needle, means for fixing the one or more baskets to a rotating shaft, and the rotating shaft being moved with respect to a level of a plating solution. A rotating means for holding and rotating at an angle of less than 90 degrees, and an energizing means in which the rotating shaft also serves as an energizing path for plating. 2. A plating method according to claim 1, wherein one or more baskets are held while rotating at an angle of less than 90 degrees with respect to the surface of the plating solution, and the plating is performed while rotating.