JP2006265630A - Production method for metal product and the metal product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production method for a plated metal product in which engraved mark are clearly seen, and to provide a metal product in which the engraved mark are clearly seen. <P>SOLUTION: The production method is characterized in that, after a metal product is plated, the surface of the metal product is engraved. In the metal product having engraved marks, the inner circumferential face of a groove in each engraved mark formed on the surface of the plated metal product by engraving is provided with a plating layer equal to the above plating layer on the surface or the one thinner than that. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a metal product having a plating layer and a stamp, and the metal product.

  For example, metal products such as iron products are subjected to anti-corrosion plating in order to protect the ground metal from corrosion, and model numbers and other marks are often engraved for quality control and quality assurance.

Conventional metal products having a plating layer and a stamp are plated after the stamp is formed.
nothing special

  If the metal product is small, if the plating solution attached to the surface of the product pulled up from the plating tank is thick, it can be applied to a centrifuge to make it thinner. When it is so large or long that it cannot be hung, the metal product is lifted from the plating tank and simply hung on a hook to be dried. As a result, the plating solution flows into the grooves formed in advance, and at the end of drying, the grooves become shallow due to the thick plating layer formed in the grooves. There was a problem of invisible.

The present invention has been made in view of the above circumstances, and a first problem to be solved is to provide a method for producing a metal product having a plating layer and a stamp so that the stamp can be clearly seen. There is.
The second problem is to provide a metal product having a plating layer and a stamp, and the stamp can be clearly seen.

In order to solve the first problem, a method for producing a metal product having a plating layer and an inscription according to the present invention is characterized in that after the metal product is plated, the surface of the metal product is stamped ( Claim 1).
Since plating is performed from above the plating layer after plating, a plating layer thicker than the plating layer on the surface is formed in the groove of the stamp, and the groove does not become shallow. Therefore, the inscription looks clear.

In the method of the present invention, it is desirable to perform stamping using a stamping punch having a rounded tip (hereinafter simply referred to as “punch”).
When using a punch with a sharp tip, the plating layer on the inner peripheral surface of the engraved groove tends to disappear, but when using a punch with a rounded tip, the plating layer on the inner peripheral surface of the engraved groove Can be prevented from disappearing.

In the method of the present invention, it is desirable to set the stamping load corresponding to the hardness of the ground metal of the metal product, and to set the stamping depth in a range not exceeding the elongation rate of the plating layer. ).
By setting the stamping load and the stamping depth, it is possible to form a plating layer equal to or thinner than the plating layer on the surface of the metal product on the inner peripheral surface of the stamped groove, and the stamping is clear. Since the plating layer in the groove is surely prevented from disappearing without being visible, the anticorrosion property of the metal product is not impaired because it is engraved after plating.

  In order to solve the second problem, a metal product having a plated layer and a stamp according to the present invention is formed on the inner peripheral surface of a groove of a stamp formed on the surface of a plated metal product by the surface. The present invention is characterized in that a plating layer equal to or thinner than the plating layer is provided.

  With the above configuration, the engraving groove is not formed shallow with a thick plating layer, and there is only a plating layer equal to or thinner than the plating layer on the surface of the metal product. The depth of the groove (cutting depth). Therefore, a clear shade is formed in the groove, and the inscription is clearly seen by the contrast between the reflected light from the surface and the shade of the groove.

  According to the first aspect of the present invention, since the engraving is performed after the plating process, the engraved groove is not made shallow by the thick plating layer, so that a metal product in which the engraving is clearly visible can be produced.

  According to invention of Claim 2, since it stamps using the punch which has a roundness at the front-end | tip, the loss | disappearance of the plating layer remaining on the internal peripheral surface of the groove | channel of a marking can be prevented. Accordingly, it is possible to prevent the anticorrosion property from being lowered by the stamping after plating.

  According to the invention of claim 3, since it is possible to form a plated layer equal to or thinner than the plated layer on the surface of the metal product on the inner peripheral surface of the groove of the stamp, the stamp cannot be seen clearly. Therefore, the disappearance of the plating layer in the groove is surely prevented, and the anticorrosion property of the metal product is not deteriorated because it is stamped after plating.

  The metal product having a plated layer and a stamp according to the invention of claim 4 is equal to or equal to the plated layer on the surface of the metal product on the inner peripheral surface of the groove of the stamp formed on the surface of the plated metal product by stamping. Since the stamp has a thinner plating layer, the stamp has a stamping depth as calculated, so that the stamp can be clearly seen by the contrast between the reflected light from the surface of the metal product and the shadow of the groove.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a process diagram of a method for producing a metal product having a plated layer and a stamp according to the present invention, FIG. 2 is a plan view of a part of a stamped portion of an example of a metal product produced by the method of the present invention, and FIG. Is an enlarged cross-sectional view of a part of the marking of the product, and (a) and (b) show the plating layer in the groove with different stamping loads. 4 is an explanatory view of the plated layer, FIG. 5 is an end view showing an example of a punch having a rounded tip, and FIG. 6 corresponds to FIG. 4 showing a plated layer in a groove stamped by a punch having a rounded tip. FIG. 7 is an explanatory diagram comparing FIG. 4 and FIG.

  As shown in FIG. 1, the production process according to the present invention for a metal product having a plated layer and a stamp is performed by a plating process b and a stamping process for a metal product manufactured by a normal manufacturing method, particularly a large or long product. The engraving step d is a main step, but includes a pretreatment step a such as cleaning performed before and after the plating treatment step b and a posttreatment step c such as drying, as in a normal method.

  The purpose of the plating in the plating process b may be anticorrosion or decoration, and the plating method is a plating process in which a plating solution adheres to the surface of the metal product in the post-processing process, that is, electric Either plating or immersion plating may be used, but in this embodiment, a case where the hot dip galvanization of immersion plating is performed will be described as an example when the metal product is an iron product and high corrosion resistance is required.

  In the stamping step d, numbers, letters, symbols and other marks are stamped and stamped using a punch with a stamping machine.

  FIG. 2 shows an example in which the stamp 2 of the numeral 140 is formed by stamping on the surface of the metal product 1 after plating. It is assumed that a plated layer 3 having a normal film thickness generated by the plating process is uniformly formed on the surface of the metal product 1 after the plating process, and stamping is performed with respect to a desired position on the surface of the metal product. Shall be done. Since the stamping is performed after the plating process, the metal surface having the plating layer with a uniform film thickness is stamped with a punch. Therefore, the inner peripheral surface of the groove of the stamp 2 formed by the stamping is shown in FIG. As shown in FIG. 3, plating layers 3b1 and 3b2 having a film thickness equal to or thinner than the plating layer 3a on the metal surface remain. The thickness of the remaining plating layer varies depending on the hardness of the ground metal 1a, the stamping load, the stamping depth, the elongation rate of the plating layer, the punch edge shape, and the like.

  3 (a) and 3 (b) show the numbers in FIG. 2 when the steel product is galvanized and punched with a punching load of 15t and 20t, respectively, using a punch whose blade edge has an angle. 1 is a cross-sectional view at the center of the vertical side of FIG. 1 and particularly shows the difference in thickness of the plating layers 3b1 and 3b2 in the groove of the stamp.

  More specifically based on FIG. 4, the stamping load and the stamping depth correspond to the hardness of the ground metal 1a and the elongation rate of the plated layer (galvanized) (for example, 15t, 0.44mm). In this case, the plating layer 3b1 remaining in the groove is continuous although it becomes somewhat thinner toward the bottom of the groove 2. On the other hand, the plating layer 3b2 remaining when the stamping load and the stamping depth exceed the hardness of the ground metal or the elongation rate of the plating layer (as an example, 20 t, 0.52 mm or more) is near the bottom of the groove. Disappears at. That is, the ground metal is exposed at the bottom of the groove.

  Some exposure of the ground metal is not a problem, depending on the combination of the ground metal and the plated metal, because the corrosion of the ground metal is suppressed by the sacrificial anti-corrosion action. This is not preferable because it causes. Combinations of ground metal and plated metal that provide sacrificial anticorrosive action include iron and galvanized, nickel and galvanized. Therefore, the method of the present invention includes a mode in which the plating layer is stamped to such a depth that the plating layer slightly disappears at the bottom of the groove of the marking as shown in FIG.

  The best mode of the method of the present invention is to use a punch 4 having a rounded edge 4a as illustrated in FIG. 5 in order to solve the problem of disappearance of the plating layer at the bottom of the groove of the stamp after the plating process. It is to stamp. FIG. 6 shows two types of punches having a radius of curvature (R) of the cutting edge of 0.5 mm and 0.8 mm when a groove having a groove width of 1.22 to 1.28 mm is stamped, as in the case of the marking in FIG. 3 is an enlarged cross-sectional view at the center of the vertical side of the numeral 1 in FIG. 2 when stamped with a stamping load of 20 t. In the case of R 0.5 mm, even if the punching load is 20 t, the punching depth is equal to that when punching is performed with a punching load of 15 t using a punch having an angle, and the film of the plating layer 3 b 1 in that case A plating layer 3b3 having a film thickness substantially equal to the thickness was obtained. R0.8 mm was determined with the aim of making the stamping depth shallower than in the case of R0.5 mm. In this case, the depth of the groove 2 is about 0.35 mm, but the marking is clearly visible, and the thickness of the plating layer in the groove is thicker than that in the case of R 0.5 mm. In either case, 90 to 95% of the plating film thickness at the groove bottom remains on the metal surface. FIG. 7 shows the difference between the stamping depth and the thickness of the plating layer in the groove when a stamp having the same groove width is formed by a punch having a sharp edge and a punch having a round blade edge. The plated film thickness of the round punch is the same as that in FIG. 6, but is omitted in FIG. 7 for the sake of simplicity. 6 and 7, when a punch with a round edge is used, the plating layer does not disappear at the bottom of the groove even if the punching load is increased. Is reliably prevented from being damaged.

  The present invention can be used for various metal products to be electroplated and dip plated, such as nameplates and nameplates.

The process drawing of the manufacturing method of the metal product which has a plating layer and a stamp by this invention. The top view of a part of the stamped part of the metal product produced by the method of the present invention. The expanded sectional view of a part of stamp which shows the plating layer in a groove | channel by a different stamping load. Explanatory drawing regarding the plating layer. The end elevation which shows an example of the punch which has a roundness in a blade edge | tip. The expanded sectional view corresponding to FIG. 4 which shows the plating layer in the groove | channel stamped with the punch which has roundness at the front-end | tip. FIG. 7 is an explanatory diagram comparing FIG. 4 and FIG.

Explanation of symbols

1 Metal product 2 Stamp (groove)
3 Plating layer 3a Plating layer on metal surface 3b1 to 3b4 Plating layer in groove 4 Punch

Claims (4)

  A method for producing a metal product having a plated layer and a stamp, wherein the metal product is plated and then stamped on the surface of the metal product.   2. The method for producing a metal product according to claim 1, wherein the stamping is performed using a stamping punch having a rounded tip.   3. The metal product according to claim 1, wherein the stamping load is set in accordance with the hardness of the ground metal of the metal product, and the stamping depth is set in a range not exceeding the elongation rate of the plating layer. Production method.   In a metal product having a plating layer and a marking, a plating layer equal to or thinner than the plating layer on the surface is provided on the inner peripheral surface of the groove of the marking formed by stamping on the surface of the plated metal product. Metal products characterized by that.

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