JPS601218B2 - External coating iron and its manufacturing method - Google Patents

Description

[Detailed description of the invention] The invention relates to a coated key and a method of manufacturing the same.

Recently, an outer surface coating layer made of a synthetic resin material has been formed on the outer surface of a metal key in order to improve its commercial value, heat insulation effect, and impact resistance.

The present invention relates to such an outer surface covered cone, in which the thickness of the covering layer made of a synthetic resin material can be made almost uniform,
It is also designed to be easy to manufacture. To explain the drawings below, reference numeral 1 denotes a metal key body, with 8 parts 3 standing up from the periphery of the bottom wall 2, and from the upper end of the body through a tapered shoulder part 4 having a smaller diameter at the top. A mouth portion 5 is formed by rolling outward and tightening.

An outer surface coating layer 6 made of a synthetic resin material is formed on the outer surfaces of the body portion 3 and shoulder portions. The lower part of the outer covering layer is thicker than the upper part, but this may vary depending on the design. Beam-shaped parts 7 made of a synthetic resin material are formed protrudingly at intervals and each having the same cross section, and each tip of the beam-shaped parts is continuous with the lower end of the outer surface coating layer.

In the illustrated example, there are four beam-like portions, but as long as there are more than two beam-like portions, any number of beam-like portions may be used. Further, as shown in FIGS. 4 and 5, the bottom wall 2 of the key body may be formed with a first recess 8 that opens downward. In this case, the beam-shaped portion 7 is formed only within the recess. The lower end portion of the outer surface coating layer may be formed to extend inward to the lower surface of the bottom wall peripheral green portion 2a. With the above configuration, the second recess 9 is formed in the bottom wall portion of the conical body that is not covered by the beam in the case of Figs. A second recess 9 is formed inside the tube-green covering portion 6a extending to the lower surface of the outer surface coating layer, and a bottom diamond 10 that can be tightly fitted may be adhered to the recess.

The formation of the outer surface covering weir with the above structure is as shown in Fig. 3.
Just go.

A compressed air supply hole li having an outer diameter approximately the same as the inner diameter of the mouth of the coin body is inserted into the body 1.

The village shall have a compressed air path 12 on its axis,
Also, at the insertion part, the nozzle hole 13 is opened to the side.
・Set up. It is preferable that the upper part has a large diameter part 11a and a step part 11b is formed at the lower end so that the step part contacts the mouth surface of the cone body when the lower part is inserted. 14,
14 is an injection mold having a cavity 15;
The mold is provided so that a gap for forming the outer surface coating layer is formed between the outer surface of the conical part and shoulder of the conical body and the inner wall of the cavity when the mold is clamped.

Further, the tip end surface 17 of the mold i6 with injection holes is brought into contact with the lower surface of the mausoleum, and the key main body bottom wall 2 is held between it and the lower end surface of the compressed air inlet hole 11. The key body 1 is set in the injection mold by fixing the key body 1 at two upper and lower places between the opening part 5 and the upper part of the compressed air supply hole. The injection hole-equipped mold 16 has an injection hole 18 on the marking line, and is opened facing the center of the bottom wall 2, and the mold has an injection hole 18 at the same angular interval from the closed edge to the periphery on the tip surface of the mold. A plurality of gates 19 having a cross-sectional size are formed in a radial pattern, and are provided so that the tips of the gates and the lower end of the gap for forming the outer surface coating layer are moved during mold clamping.

In the above-mentioned horizontal formation, compressed air is jetted into the key body to pressurize it, and at the same time, the molten resin material is injected to form the beam-shaped portion and the outer surface coating layer described above.

It is difficult to always set the key body in the mold so that the gaps for forming the outer surface coating layer are equal in each part, that is, the thickness of the outer surface coating layer is uniform, In many cases, the injection pressure of the molten resin material causes the key body to deflect, resulting in the thickness of the outer surface coating layer being uneven on the left and right sides.The embodiment shown in FIG. In addition to fixing the upper and lower parts, a recess 8 that closes to the lower surface is formed in the bottom wall 2 of the key body, and the tip of a mold 16 with an injection hole is fitted into the recess. The key body is molded into the mold 14 by the iron fitting.
, 14, and prevents the key body from shaking. The present invention is constructed as described above, and the outer surface covering key has excellent heat insulation effect and impact resistance, and the bottom wall of the key body is formed with a radial beam-like portion, so that the outer surface of the key body is covered with radial beams. The wall is reinforced, and a second recess 9 is formed between the beam-like part and the lower end of the outer surface coating layer, so that the recess serves as an elastic deformation margin to improve the impact resistance of the lower end of the cone. Furthermore, since the beam-shaped portion is located on the bottom side of the key, the appearance is not impaired, and material can be saved compared to the case where the entire bottom wall is covered.

If it is not desirable to have the recessed portion depending on the use of the key, the bottom cover may be iron-bonded to the recessed portion. As for the manufacturing method, the upper part of the key body is brought into contact with the mouth part of the key body and the upper part of the compressed air inlet hole inserted into the key body, and the lower end face of the compressed air inlet punch and the end face of the mold with the injection hole are Since the lower part of the key body is fixed between the bottom wall and the bottom wall of the mold, the key body can be set in the cavity of the injection mold without moving, and the end surface of the mold with the injection hole can be fixed. Regardless of whether it is in pressure contact with the bottom wall of the key body, an injection hole is inserted into the tip of the mold, and a gate is inserted into the tip of the mold from the edge of the opening, and the tip of the gate is inserted into the body of the key body. Since the lotus is passed through the lower end of the gap surrounding the key body, the molten resin material can be injected onto the outer surface of the key body from the injection hole opened facing the center of the bottom wall while the bottom wall is being sandwiched. The gate is closed facing the center of the bottom wall 2, and the gate has an injection hole in the tip face of the mold □The injection hole is radially drilled from the green at the same angular intervals and the same cross-sectional size to the lower end of the gap. Because I have let Ren go through it,
Pressure during injection molding is applied evenly to the bottom wall of the cone body, preventing the key body from swinging due to the pressure, and making it possible to make the thickness of the outer surface coating layer uniform. Also, as mentioned above, the upper and lower parts are fixed and the conical body is set in an injection mold, and the outer coating layer is injection molded while the inside of the key body is pressurized by compressed air. Even if the key body is a hammer body with a shoulder part and a mouth part smaller in diameter than the chest part, an outer covering layer is formed on the outer surface of the body part and the shoulder part at the same time, and a beam-like part is formed on the lower surface of the bottom wall. This eliminates the need to form a coating layer on the bottom wall and the outer surface of the tsukioka part and to form a coating layer on the outer surface of the shoulder part, as in the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an externally covered cone according to the present invention, Fig. 2 is a bottom view thereof, Fig. 3 is a cross-sectional view of an apparatus for showing a method of manufacturing the key, and Fig. 4 is a cross-sectional view of a key manufacturing method. A sectional view of the apparatus, FIG. 5 is a sectional view of the main part of the externally covered cone manufactured in the embodiment of FIG. 4. 1... Waterfall body, 2... Bottom wall of cone body, 3... Trunk, 4...
・Shoulder part, 6... External coating layer, 7... Beam-shaped part, 8...
・First recess, 9...Second recess, 10...Bottom cover, 11
...Compressed air feed punch, 12...Compressed air path, 13...
Nozzle hole, 14... Injection mold, 15... Cavity, 16... Mold with injection hole, 18... Injection hole, 19...
Gate. Tahinota Sono Yu 2 Sono 3 Kaze Yu 2 So

Claims (1)

[Scope of Claims] 1. Beam-shaped parts 7 made of a synthetic resin material having the same angular intervals and the same cross section are formed radially from the center of the lower surface of the bottom wall of the metal chisel main body to the peripheral edge, and each of the beams 1. An externally coated chisel, characterized in that the tip of the shaped part is continuous with the lower end, and an external coating layer made of a synthetic resin material is formed on the outer surface of the body and shoulder of the chisel. 2. In the externally coated chisel described in claim 1,
An externally covered chisel, characterized in that the chisel body has a recessed portion opening downward in the center of the bottom wall thereof. 3. The externally coated chisel according to claim 1 or 2, characterized in that the bottom cover is fitted into a recess formed on the lower surface of the chisel main body by providing the external coating layer and the beam-shaped part. External coating iron. 4 The upper part of the chisel main body is fitted with the upper part of the compressed air feeding rod which is inserted into and out of the chisel main body, and the lower end surface of the compressed air feeding rod and the mold with the injection hole are connected. The lower part of the chisel body is fixed by clamping the bottom wall of the chisel body with the tip surface of the chisel, and the chisel body is set in the cavity of the injection mold, and the injection hole tip of the mold with the injection hole is fixed to the bottom wall of the chisel body. The tip of the gate is opened facing the center and is bored radially from the edge of the opening to the tip of the mold at the same angular intervals and the same cross-sectional size at the lower end of the gap surrounding the body of the chisel body. A method for forming an outer surface coated chisel, characterized in that the inside of the chisel body is pressurized by a jet of compressed air from the compressed air feed rod, and at the same time, a molten resin material is injected from an injection hole. 5. In the method for forming an externally coated chisel as set forth in claim 4, a recess opening downward is provided in the center of the bottom wall of the metal chisel body, and the distal end surface of the mold with injection holes is inserted into the recess. A method for forming an outer surface covered chisel, characterized in that the process is carried out by fitting the navel chisel body so as to prevent the sway of the chisel body.