JPH06128788A - Precision electroformed mold - Google Patents

Abstract

PURPOSE:To produce a precision electroformed mold enhanced in transfer accuracy and excellent in high-temp. hardness, heat resistance, wear resistance and shape holding property by electroplating the surface of a matrix with Ni or Co and thickly forming an Ni-alloy electroformed layer thereon. CONSTITUTION:The surface of a pretreated wooden matrix 1 is electroplated 2 with Ni or Co in about 1-2mum thickness. This electroplating layer 2 is excellent in adhesion and firmness of attachment to the matrix 1, and high transfer accuracy is secured. An Ni-alloy electroless plating layer contg. about 0.1-1.0% B is then formed, as required, on the layer in about 10-50mum thickness, an Ni-alloy contg. about 8-10% Fe is electroformed to obtain an Ni-alloy electroformed layer 3 having about 0.3-5mm thickness. A backing member 5 of epoxy resin, etc., is formed on the layer 3. The matrix 1 is then released to obtain a precision electroformed mold 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precision electroforming mold having a high transfer accuracy for performing molding such as plastic molding and glass molding.

[0002]

2. Description of the Related Art Conventionally, as this type of precision transfer mold,
There is known a mold in which a Ni electroformed layer is applied to the surface of a mother die, a backing member is attached to the die, and the surface is demolded. or,
There is also known a die which is lined with only a Ni alloy electroformed layer in place of the Ni electroformed layer.

[0003]

In the conventional mold having only the Ni electroformed layer, the hardness is as soft as HV = 200 at room temperature and the Ni / electroformed layer is soft when 200 to 600 ° C. plastic molding / glass molding is press-fitted. However, the accuracy of the unit of micron could not be ensured due to the deformation and abrasion. Further, in the case of a die having only the Ni alloy electroformed layer, the hardness is HV = 40 at room temperature.
0 to 500, high temperature hardness, little wear and deformation, but large electro-deposition stress. Therefore, it often peels from the surface of the mold at 0.1-0.2 mm during electro-deposition and can be used as a defective product. There is a problem that it does not exist.

Further, with only the Ni alloy electroless plating layer,
Although HV = 400 to 600 and excellent in room temperature and high temperature hardness, a mold could not be formed due to the problems that only a thickness of several tens of μm can be formed, and the electrodeposition stress is large and peeling is large.

The problem to be solved by the present invention is to eliminate the problems of these conventional molds, and to obtain a high precision with high transfer accuracy, high temperature hardness, and excellent heat resistance, wear resistance and shape retention. It is to provide an electroformed mold.

[0006]

Means for Solving the Problems The gist of the present invention which has solved the above problems is as follows: 1) After electroplating Ni or Co on the surface of a mother die and forming a thick Ni alloy electroformed layer thereon, Precision electroforming mold manufactured by demolding the master mold 2) Ni or Co electroplating is applied to the master mold surface, a Ni alloy-based electroless plating layer is formed on the master mold, and the Ni alloy electroplating layer is further formed on the surface. A precision electroformed mold produced by forming a thick cast layer and then removing the mother die. 3) The precision electroformed mold according to 1 or 2, wherein a backing member is attached to the surface of the Ni alloy electroformed layer. Here, it is desirable that the electroplating of Ni or Co be about 1 to 2 μm, the Ni alloy electroless plating be about 10 to 50 μm, and the Ni alloy electroforming be about 0.3 to 5 mm.

[0007]

In the present invention, since the Ni or Co electroplating layer is in contact with the surface of the mother die, the adhesion and adhesion to the mother die are excellent and a high transfer accuracy is ensured.
Since the Ni alloy electroformed layer, which has heat resistance and excellent hardness, is formed on the i, Co electroplated layer, it has hardness, strength, and shape retention properties, and is suitable for plastic injection pressure and glass injection pressure. I try not to deform it.

Particularly, in the case where the Ni alloy electroless plating is performed on the Ni or Co electroplating layer and the Ni alloy electroforming layer is further formed, the Ni alloy electroless plating layer has excellent high temperature hardness, and Generates a bonding force between the Ni / Co electroplating layer and the Ni alloy electroformed layer, and has higher strength and pressure resistance.
It has excellent heat resistance.

[0009]

Embodiments will be described below with reference to the drawings. Figure 1
2 is a cross-sectional view of an embodiment of a precision electroformed mold having a backing and a die according to claim 1, and FIG. 2 is an implementation of a precision electroformed mold 7 having a backing and a die according to claim 2. It is sectional drawing of an example.

In the embodiment shown in FIG. 1, 2 μm of Ni electroplating 2 is applied to the surface of a pretreated wooden mother die 1, and a Ni alloy containing 8 to 10% Fe is electroformed on the surface. Three
A Ni alloy electroformed layer 3 of mm is formed, and an epoxy resin backing member 5 is attached thereon. After that, the mold is manufactured by demolding the mother die 1. This precision electroforming mold 6 has a Ni electroplating layer 2 that is in close contact with the mother die 1 and has a precise transfer surface in the submicron unit, and the Ni alloy electroforming layer 3 shares the hardness and strength in forming. It was possible to avoid deformation by the injection pressure of the material. Further, the heat resistance is also made excellent by the Ni alloy electroformed layer 3. Further, even if the Ni electroplated layer 2 is worn, the lower Ni alloy electroformed layer 3 is exposed on the surface and durability is increased.

The precision electroformed mold 7 of the embodiment shown in FIG.
i between the electroplated layer 2 and the Ni alloy electroformed layer 3
The Ni alloy electroless plating layer 4 containing 5 to 1.0% of the Ni alloy.
It was formed with a thickness of 03 mm, and Ni in the middle
The alloy electroless plating layer 4 further enhances the hardness at high temperature and strengthens the bonding force between the Ni alloy electroformed layer 3 and the Ni electroplated layer 2.

[0012]

As described above, according to the present invention, the adhesiveness to the mother die is good, and the highly accurate transfer of 0.1 to 0.2 μm unit can be obtained, and the high temperature hardness and strength are high. As a result, a precision mold having excellent wear resistance, little deformation at high temperatures, and durability was obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of reference numerals] 1 mother die 2 Ni electroplating layer 3 Ni alloy electroforming layer 4 Ni alloy electroless plating layer 5 Backing member 6 Precision electroforming die 7 Precision electroforming die

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C25D 7/00 F

Claims (3)

[Claims] 1. A precision electroforming mold manufactured by electroplating Ni or Co on the surface of a mother die, forming a thick Ni alloy electroformed layer on the surface, and then removing the mother die. 2. The surface of the master mold is electroplated with Ni or Co, a Ni alloy-based electroless plating layer is formed thereon, and a Ni alloy electroformed layer is thickly formed on the surface of the master mold. Precision electroforming mold manufactured by demolding. 3. The precision electroformed mold according to claim 1, wherein a backing member is attached to the surface of the Ni alloy electroformed layer.