JPH0255592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method of manufacturing a key whose head is molded with resin.

<Prior art> Conventionally, in the production of keys whose heads are molded from resin, as shown in the process diagram in Figure 1, a semi-finished key is first made from a plate material by press punching, and then this semi-finished product is A keyway is formed on the key shank portion by cutting or press working, and then a ridge is processed by a ridge processing device and a key number is stamped. Then, after performing barrel processing, plating with nickel or the like is performed, then the key head is molded with resin, and then, for example, three keys with the same number are grouped together. This was tied into a bundle using a ring to create a key with a resin head.

As mentioned above, in the conventional process, the keys that are carved and given key numbers come apart when entering the barrel process or the mating process.
Keys with the same number were separated, and after the plating process, it was necessary to group the keys whose heads were molded with resin into the keys with the same number and bind them together with a ring.

<Problems to be Solved by the Invention> However, there is a problem in that the work of collecting and linking keys with the same number from among a large number of discrete keys is complicated for the operator and reduces work efficiency. In addition, since there is a resin molding process for the head between the key thread processing (number stamping) process and the process of linking keys with the same number, the key thread processing (number stamping)
It is not possible to continuously link keys with the same number as a continuous process, resulting in a problem of poor productivity.

<Means for Solving the Problems> The present invention has been made to solve the above problems, and improves productivity by quickly and easily bundling keys of the same number with a ring. The present invention provides a key manufacturing method that can be used. For this purpose, the key manufacturing method of the present invention involves resin molding the key head with the keyway molded thereon, then processing the key threads and punching the key number, and then bundling the keys with the same number with a ring. Now performs plating processing.

<Example> Hereinafter, an example of the present invention will be explained with reference to the process diagram shown in FIG. The keys are tied together with a ring to complete the ring.

First, a semi-finished key is made by stamping a brass or iron plate. Then, a keyway (groove) is formed in the key yank portion of this semi-finished product by cutting or pressing, and surface burrs are removed by barrel processing. After this, the head 2 of the key is molded by resin molding. Subsequently, the key is processed by a thread processing machine, and a key number is stamped on the key. In addition, for resin molding, alkali-resistant and acid-resistant resins such as vinyl chloride, vinylidene chloride, polyethylene, trifluoroethylene, or tetrafluoroethylene are used so that they will not be affected by the subsequent plating process. . and,
Three keys with the same number are easily gathered together and bound together by a metal ring.
At this time, key thread processing (number punching) and key linking can be performed within one machine. Next, the three linked keys are put into a plating process. In the plating process, for example, ordinary nickel plating is applied to the key yank part 1 of the metal part, but the degreasing, pickling, plating, and neutralization treatments during this time do not affect the resin at all. Only the metal surface portion is plated without deforming or discoloring the resin head 2, and the key is completed.

The above plating step can be carried out by electroless nickel plating as follows.
Degreasing was performed for 2 minutes with a solution of Na ₂ CO ₃ : 40 g/, Na ₂ SiO ₃ : 20 g/, followed by lead dichloride (PbCl ₂ ): 3 g/, tin dichloride (SnCl ₂ ): 30
Catalyst application treatment is carried out for 2 minutes at room temperature in a solution of 100 to 200 ml of hydrochloric acid (HCl). After that, the hydrogen ion concentration was adjusted to PH4.2-4.7 and 70± by adjusting nickel sulfate (NiSO ₄ ): 15-30g/, sodium citrate: 50g/, and sodium hypophosphite as a reducing agent: 20g/. Electroless nickel plating is carried out at a temperature of 2°C.

In addition to nickel plating, tin or zinc plating can also be used in the plating process, and the key material is not limited to copper alloy or iron.

<Effects of the Invention> As described above, according to the method for manufacturing a key according to the present invention, after forming a keyway on a semi-finished key product and molding the head of the key with resin, key thread processing is performed and the same number is formed. Since the keys are linked together and the bundled keys are plated, the linking workability is good, and keys with the same number are not separated into pieces during the plating process. Linking of the same key can be easily performed, and work efficiency is improved compared to conventional methods, and productivity can be improved. In addition, since plating is performed after resin molding, unnecessary plating of the resin molded portion is not performed, resulting in economical effects.

[Brief explanation of the drawing]

Figure 1 is a process diagram showing the conventional key manufacturing method.
FIG. 2 is a process diagram showing the key manufacturing method of this invention;
FIG. 3 is a front view of the key. 1...key yank part, 2...resin head.

Claims (1)

[Claims] 1. A method for manufacturing a key, which comprises forming a keyway on a semi-finished key, molding the head of the key with resin, performing key thread processing, and then plating the key.