JPH0542752A - Preparation of porous metal seal - Google Patents

Abstract

PURPOSE:To prepare a porous metal seal by a simple process. CONSTITUTION:A particulate material A or aluminum or an alloy thereof containing a particulate material B composed of a low m.p. aluminum alloy is sintered at temp. liquefying the particulate material B of the low m.p. aluminum alloy to form a porous sintered body 2 having 30% or more of through- holes C and a female mold 3 having a character or pattern formed thereto as a recessed part 3a is pressed to the sintered body and the character or pattern sealed on a material to be printed is formed to the porous sintered body 2 as a protruding part 1a to obtain a porous metal seal 1. Since the porous metal seal receives the distributing action due to the collapsed part and a proper amount of ink is supplied from the through-holes of the non-collapsed part, sharp sealing is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a porous metal stamp.

[0002]

2. Description of the Related Art A conventional method for producing a metal stamp is disclosed in, for example, Japanese Patent Publication No. 63-35437, and the following (a)
There are some which consist of each process of (f). (A) A step of filling the mold with the easily water-soluble salt powder having a particle size in the range of 10 to 150 μ, (b) heating the mold filled with the easily water-soluble salt powder, and easily water-soluble therein A step of sintering the salt powder, (c) a step of preheating the easily water-soluble salt sintered body thus obtained and press-fitting the molten metal therein, (d) obtained after the molten metal is cooled and solidified Step of engraving required characters, patterns, etc. on the surface of the metal-salt complex, (e) step of hardening treatment on the engraved surface, and (f) washing and removing the easily water-soluble salt portion from the metal-salt complex. Process,

[0003]

However, the conventional method of manufacturing a metal stamp has the following technical problems. That is, (1) as the material for the stamp, unnecessary water-soluble salt powder is used, which is sintered and
The manufacturing process is complicated because it must be removed by washing in the final step. (2) Since the easily water-soluble salt sintered body is preheated and the molten metal is pressed into it by applying a pressure larger than the flow resistance, the manufacturing process is complicated. (3) Since the required characters, patterns, etc. are engraved on the surface of the metal-salt complex by cutting, there is an advantage that the pores are not blocked by cutting debris, but the protrusions that form the characters, patterns, etc. Porosity is almost the same between the part and other recesses, and ink exuded from parts other than letters, patterns, etc. may adhere to the printing material, making the printing unclear and staining the printing material. There is. (4) Since the joint portion formed by sintering the easily water-soluble salt powders to each other connects a large number of pores to form a permeation hole, many perforations are present in the permeation hole. There is a risk of insufficient ink supply from the holes.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems, and its constitution is aluminum containing powder particles of an aluminum alloy having a low melting point or an alloy thereof. For a porous sintered body that is formed by sintering a powder or granular material at a temperature at which a powder of a low melting point aluminum alloy is liquefied and has a permeation hole of 30% or more,
A porous metal that is a porous metal stamp formed by pressing a female mold formed with characters, patterns, etc. as concave parts and imprinting it on the material to be printed to form a porous sintered body with characters, patterns, etc. as convex parts It is a method of manufacturing a stamp.

[0005]

According to such a method for producing a porous metal stamp, a powder of a low melting point aluminum alloy and a powder of a higher melting point aluminum or its alloy are mixed to form a low melting point aluminum alloy. Since the powder and granules are sintered at a temperature at which they become liquid phase to form a porous sintered body, the porous sintered body is made of aluminum or its alloy powder and aluminum alloys having a lower melting point. It has a structure in which it is firmly bonded to each other. 30% or more of the permeation holes of the porous sintered body are ensured by sintering the mixed powder particles without pressure. Characters, patterns, etc. for imprinting on the material to be printed are formed by pressing and crushing a part of this porous sintered body with a female die to form a convex portion that remains without being crushed on the porous metal stamp. To be done.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 4, reference numeral 1 indicates a porous metal stamp, which has a convex portion 1a for imprinting characters, patterns and the like on the print target material 4.

Such a porous metal stamp 1 is manufactured from a porous sintered body 2 made of only aluminum or its alloy powder particles. That is, this porous sintered body 2
Is made of aluminum or powder A of aluminum alloy powder B having a low melting point, and sintered at a temperature at which the powder B of low melting aluminum alloy powder B is liquefied. Powder A of aluminum or its alloy manufactured
The two have a structure in which they are joined together by a low melting point aluminum alloy, and a permeation hole C having a volume ratio of 30% or more is provided.

This porous sintered body 2 is, for example, Japanese Patent Publication Sho 56.
It is manufactured by the method disclosed in Japanese Patent Publication No. -18646, and as shown in FIG. 1, aluminum or its alloy powder A is used as a main raw material, and aluminum having a melting point of about 10 ° C. lower than that of the main raw material. A powder obtained by uniformly mixing the alloy powder B is used as the sintering material. However, the particles A and B have a shape other than a spherical shape or a shape close to the spherical shape (for example, a rod shape, an elliptical shape, or the like).

Then, the mixture is put into a plate-shaped graphite mold 5. The bottom of the graphite mold 5 forms a flat surface, and the characters, patterns, etc. to be formed on the porous metal stamp 1 are not engraved. The graphite powder 5 is filled with the mixed powders A and B by gravity spraying which is naturally dropped from a hopper (not shown), and the excess mixed powders A and B are scraped off and sintered without pressure. As a result, the porous sintered body 2 having a shape corresponding to the graphite mold 5, for example, a plate shape is obtained. The permeation holes C formed by a large number of pores communicating with each other in the porous sintered body 2 are three-dimensionally communicating in all directions.

The sintering temperature is set to a temperature higher than the melting point of the granular material B and lower than the melting point of the granular material A, so that the granular material B is sintered in the liquid phase. As a result, a sintered body having a structure in which the powder particles A of aluminum or its alloy are firmly bonded to each other by the powder particles B of the aluminum alloy is manufactured. Porous sintered body 2 having permeation holes C of 30% or more
Can be obtained by sintering without applying pressure without taking a pressure step before sintering.

The particle size of the powder A of aluminum or its alloy or the powder B of a low melting point aluminum alloy is appropriately selected according to the size of the characters to be imprinted, the type or size of the design, etc. This allows a clearer impression to be made. When it is necessary to increase the rigidity of the surface, powder B of a low melting point aluminum alloy is used.
For example, Al-Cu alloy powder is used.

Next, a printing surface 1c is formed on one side surface of the porous sintered body 2 made of only such a powder or granular material of aluminum or its alloy. The printing surface 1c is formed by using a female die 3 having a concave portion 3a engraved with desired characters, patterns, and the like. That is, as shown in FIG. 4, a female die 3 is applied to one side surface of the porous sintered body 2, and a ram pressure of a press device (not shown) is applied to the female die 3 to cause the female die 3 to have a concave portion 3a. The porous sintered body 2 is partially crushed by
As shown in FIGS. 4 and 5, a printing surface 1c including a convex portion 1a and a concave portion 1b is formed on one side surface of the porous sintered body 2 to form a porous metal stamp 1.

On the printed surface 1c, the portion 1b crushed by the female die 3 as shown in FIG. 5 has a tendency that the permeation holes C of the porous sintered body 2 tend to be small. Three
Therefore, any porosity of the portion forming the convex portion 1a remains as the transmission hole C that maintains the porosity of 30% or more.

Next, the work of printing using the imprinting device 11 to which the above-mentioned porous metal stamp 1 is attached will be described. 6 and 7, reference numeral 12 is a porous metal mat made of the porous sintered body 2, 13 is a metal main body, 14 is an ink reservoir of the metal main body 13, 15 is an ink passage, 16
Is a cap of the metal body 13, 17 is a ventilation hole, 18 is a heater, 19 is a lead wire, 20 is a stopper for attaching the porous metal stamp 1 to the metal body 13, and 21 is an ink reservoir 1.
It is the solid ink contained in No. 4. The size of the porous metal stamp 1 is 60 mm in length, 30 mm in width, and 5 mm in thickness.
Is.

A heat-melting solid ink 21 is put in the ink reservoir 14 and a cap 16 is mounted, and then a heater 18 is provided.
When heated by the method, the solid ink 21 is liquefied and at the same time, the porous metal stamp 1 is heated. As a result, the liquefied ink 21a is supplied to the porous metal mat 12 through the ink passage 15 and the temperature of the porous metal mat 1 is raised.
It penetrates into the porous metal stamp 1 from 2.

From this state, the metallic main body 13 is lowered by an elevating device (not shown) to press the printing surface 1c onto the printing material 4 and imprint it. The ink 21a is rapidly cooled and solidified and fixed on the printing material 4. A stamping device 1 of a type in which such a solid ink 21 is heated by a heater 18.
1 is usually applied to the print-receiving material 4 made of a plastic film, rubber, coated paper, or the like, which is difficult to attach general liquid ink.

The ink 21a is a porous metal mat 12
After passing through the porous metal stamp 1 through the print surface 1
However, since the concave portion 1b, which is a previously crushed portion, exerts a rectifying action in the process, the liquid ink 2 is directed toward the convex portion 1a involved in the imprinting of the printing surface 1c.
1a is well guided. That is, in the portion previously crushed by the female mold 3, since the diameter of the permeation hole C is reduced and the flow resistance is increased, the exudation of the ink 21a to this portion is suppressed well, and the sintering is performed. The ink 21a is exuded and imprinted exclusively from the convex portion 1a which maintains the transmission hole C having a porosity of 30% or more at that time. As a result, a clear imprint having a large film thickness can be formed. In addition, porous metal stamp 1
Through hole C is difficult to be crushed by the pressure associated with the imprint, and
By the contact of the heated porous metal stamp 1 with the printed material 4
The fact that the surface of the ink is heated to improve the adhesion of the ink 21a also contributes to the clear imprinting.

As a result of the imprinting test, the size is 2 mm × 1 m.
Characters in the range of m to 10 mm x 10 mm are about 2 m
It is known that high-speed printing is performed 120 times or more per minute on the outer surface of a m-thick smooth plastic, rubber, coated paper, or the like, and a clear imprint can be obtained. The thickness of the imprint film on the material to be printed 4 was measured and found to be 0.01 to 0.03 m when the material to be printed 4 is a smooth plastic film.
It was m.

By the way, the porous metal stamp 1 described above can be applied to a rotary type stamping device 31 as shown in FIGS. 8 and 9. In the figure, 33 is a roll body, 33
Reference numeral a is an ink passage, 34 is a cap, 35 is a heater set shaft, 36 is a pulley, 37 is a stamp receiving roll, and 38 is a feed roller. At the time of imprinting, the solid ink 21 is heated by the heater 18 to form the liquid ink 21a, and the roll main body 33 is rotationally driven and the feed roller 3 is used.
The print-receiving material 4 is fed by means of 8. As a result, the liquid ink 21 exuding from the convex portion 1a of the porous metal stamp 1 is formed.
Since it is imprinted on the material 4 to be printed by a, clear characters, patterns and the like are imprinted in substantially the same manner as when imprinting using the imprinting device 11 described above.

[0020]

As can be understood from the above description,
According to the method for manufacturing a porous metal stamp according to the present invention, the porous metal stamp is manufactured by a simple manufacturing process of pressing and crushing a part of the porous sintered body having a firm bonding structure. ..

According to the porous metal stamp manufactured by this method, the ink flow is rectified and is not crushed by forming the crushed portion and the structure having a smaller degree of crushing. Or, since an appropriate amount of ink is supplied from the transmission holes of the part where the degree of crushing is small, it is possible to prevent bleeding of the ink from the crushed part and to make the imprint unclear, and in particular, the ink supply amount is insufficient. The unclear imprint caused by is eliminated and a clear imprint is applied.

Further, since the porous metal stamp is formed by a porous sintered body of aluminum or its alloy,
It has excellent thermal conductivity and, in addition, there is very little risk that the perforation holes will be crushed by the pressure during imprinting, and a porous metal stamp suitable for application to a stamping device that heats and melts solid ink to continuously stamp can be obtained. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a manufacturing process of a porous sintered body according to one example of the present invention.

FIG. 2 is a sectional view showing a porous sintered body of the same.

FIG. 3 is a sectional view showing the same female mold.

FIG. 4 is a sectional view showing a forming process of the convex portion of the porous metal stamp.

FIG. 5 is an enlarged view showing a convex portion of a porous metal stamp.

FIG. 6 is a sectional view showing an imprinting device to which a porous metal stamp is also applied.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a sectional view showing another imprinting device to which a porous metal stamp is also applied.

9 is a sectional view taken along line IX-IX of FIG.

[Explanation of symbols]

1: Porous metal stamp, 1a: convex portion, 1b: concave portion, 1
c: printed surface, 2: porous sintered body, 3: female type, 3a: concave portion, 4: printed material, 5: graphite type, 11, 31: imprinting device, A: powder of aluminum or its alloy Granules, B: low melting point aluminum alloy powder granules, C: transmission holes.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B41N 1/06 7124-2H // C22C 1/08 D 8928-4K

Claims (1)

[Claims] 1. Formed by sintering aluminum or aluminum alloy powder containing low-melting aluminum alloy powder at a temperature at which the low-melting aluminum alloy powder becomes liquid phase. , A porous sintered body having 30% or more of permeation holes is pressed by a female die having characters and patterns formed as concave portions to imprint on the material to be printed 1. A method for producing a porous metal stamp, which comprises forming a porous sintered metal stamp to form a porous metal stamp.