JP2673036B2 - Electrolytic deburring method for plate-shaped pressed products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is capable of economically and accurately removing burrs around each through hole of a metal plate-shaped press product having a large number of through holes. The present invention relates to a method for electrolytically deburring a plate-shaped pressed product that can be manufactured.

(Prior Art) In recent years, with the development of automatic transmissions for automobiles, for example, the valve structure for controlling hydraulic pressure has become complicated, and the shape of the valve seat for this has also become complicated. Moreover, as the performance of the automatic transmission has improved, the clearances between the parts have become smaller, so the requirements for deburring have become increasingly stringent, and the burrs around many through holes that are complicatedly formed in the valve seat have been completely eliminated. It is now required to be removed.

In addition to the bubble sheet, there is an increasing demand for completely removing burrs around a large number of complicated through holes formed in a metal plate-shaped pressed product.

As an optimum deburring method for such a purpose, an electrolytic deburring method that selectively melts burrs around each through hole has been attracting attention. However, in order to electrolytically deburr a large number of through-hole burrs, it is necessary to fabricate an electrode with a complicated shape that accurately corresponds to the shape of each through-hole of a plate-shaped pressed product that is a workpiece. It is not easy to manufacture a perfect electrode.

Moreover, in order to selectively electrolytically remove the burr, it is desirable to bring them as close as possible and cover the part other than the burr, but this requires an insulator with a shape corresponding to the electrode. There was a problem that was not easy. Therefore, if an insulator that is not so precise is used and the distance between the electrode and the work is widened, there arises a problem that a high voltage and a large current are required.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and reliably deburrs a metal plate-shaped press product having a large number of through holes,
The present invention has been completed to provide an electrolytic deburring method for a plate-shaped pressed product that can be economically performed with a low voltage and a small current.

(Means for Solving the Problems) The present invention made to achieve the above objects uses a press die obtained by pressing a plate-shaped press product having a large number of through holes which is an object of electrolytic deburring. An electrode plate with a large number of through holes of the same shape as this plate pressed product is manufactured, and this electrode plate is pressed through an insulating plate having through holes at positions corresponding to the through holes of the plate pressed product. It is characterized in that it is electrolyzed in a state of being in close contact with.

As described above, the feature of the present invention resides in that the electrode plate necessary for electrolytic deburring is manufactured using the same press die used for pressing the plate-shaped press product as the work. here,
One piece of a plate-shaped pressed product that is a work may be used, or a metal plate suitable for an electrode may be manufactured by pressing with the same press die.

Further, in order to manufacture an insulating plate having a through hole at a position corresponding to the through hole of a plate-shaped pressed product, in addition to the method of pressing a plastic plate with the same press die as the work, the same metal plate as the work is previously prepared. It is also possible to manufacture a laminate of an electrode plate and an insulating plate by pasting or lining a thin plate-like or sheet-like insulating material on the surface and pressing with the same press die.

In addition, an insulating sheet may be attached or masked on the entire surface of the electrode plate pressed as described above, and only the portion corresponding to the through hole may be peeled off to obtain an insulating plate. However, since this method requires an additional peeling step only for the portion corresponding to the through hole, the same as when pressing a plate-shaped pressed product, which is a work, as in the case of the electrode plate, in the production of the insulating plate as described above. It is more preferable to use the press die of.

The electrode plate thus obtained is adhered to the plate-shaped pressed product through the insulating plate, and in this state, the electrolytic solution is applied or immersed in the electrolytic solution while the current is applied between the plate-shaped pressed product and the electrode plate. Shed. This electrode plate has a large number of through holes of the same shape as the work manufactured by using the same press die as the plate-shaped press product as the work, and the plate-shaped press manufactured as described above. Since it is in close contact with the plate-shaped pressed product via an insulating plate that has a through hole at a position corresponding to the through hole of the product, the electric current flows intensively only at the edge part of each through hole to reliably melt the burr. In addition, since the distance between the electrode plate and the work is short, a high voltage is not required.

Hereinafter, the present invention will be described more specifically with reference to the drawings.

(Embodiment) In FIG. 1, (1) is a plate-shaped press product having a large number of through holes (4) having a complicated shape used as a bubble sheet for an automatic transmission. It is manufactured by pressing with a press die.

Further, although (2) is an electrode plate and (3) is an insulating plate, in the present embodiment, a synthetic resin plate serving as the insulating plate (3) is previously attached to the surface of the metal plate serving as the electrode plate (2), This is pressed by using the same press die as that used for pressing the plate-shaped pressed product (1), whereby a method for producing a laminated body of the electrode plate (2) and the insulating plate (3) at once is adopted. ing. Therefore, these electrode plate (2) and insulating plate (3) are
A large number of through holes (5) having the same shape and arrangement as the plate-shaped pressed product (1) as a work are formed.

As shown in FIG. 2, such an electrode plate (2) is closely adhered to the plate-shaped pressed product (1) through an insulating plate (3), and as is well known, the electrode plate (2) is entirely immersed in an electrolyte solution such as NaNO ₃ solution. Energize while immersing in, or passing the electrolytic solution through the through holes (4) and (5).

As a result, the electric current concentrates on the edge portions of the through holes (4) and (5), so that burrs around the through holes (4) of the plate-shaped press product (1) inevitably generated by pressing. (6) is surely melted and complete deburring is performed.

(Effect of the invention) As described above, in the present invention, the electrode plate (2) is manufactured using the same press die as that used for pressing the plate-shaped press product (1). The electrode plate (2) having the same shape as 1) can be obtained at extremely low cost, and similarly, the insulating plate (3) can also be manufactured at low cost.

Further, in the present invention, since the electrode plate (2) and the plate-shaped pressed product (1) are closely contacted via the insulating plate (3) for electrolytic deburring, the distance between the electrodes is shortened and The current can be concentrated only on the edge portions of the through holes (4) and (5) to carry out local electrolysis, and the electrolysis can be performed accurately and completely at low voltage and small current, and the cooling of the electrolytic solution can be performed. It will be less.

Furthermore, in the present invention, even when the surface area of the plate-shaped pressed product (1) is large, the entire surface can be processed at the same time.

As described above, the present invention is capable of economically and accurately removing the burr around each through hole of a metal plate-shaped pressed product having a large number of through holes. As an electrolytic deburring method suitable for various plate-shaped pressed products having a large number of through holes, it is extremely important to contribute to industrial development.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a state of electrolytic deburring. (1): Plate-shaped pressed product (2): Electrode plate (3): Insulating plate (4): Through hole (5): Through hole

Claims (1)

(57) [Claims] 1. A press die obtained by pressing a plate-shaped press product (1) having a large number of through-holes (4), which is an object of electrolytic deburring, has the same shape as the plate-shaped press product (1). An electrode plate (2) having a large number of through holes (5) is manufactured, and the electrode plate (2) is provided with an insulating plate () having a through hole at a position corresponding to the through hole (4) of the plate-shaped press product (1). An electrolytic deburring method for a plate-shaped press product, characterized in that electrolysis is performed in a state of being in close contact with the plate-shaped press product (1) via 3).