CN1278464A - Casting-on method of inner and outer cast iron end cap of water turbine with white cast iron - Google Patents

Abstract

The present invention relates to a method for cast-repairing cast-iron end cover of hydroturbine by using white cast iron, including the following steps: removing water scale on the cast-iron end cover to be repaired, using refractory clay to make mould core whose outisde diameter is equal to or slightly less than diameter of internal hoel of cast-iron end cover to be repaired before it is not worn, and drying said mould core, placing the mould core in the internal hole of the cast-iron end cover to be repaired, heating and burning them to red, then injecting molten white cast iron via cast gate, cooling and forming, welding cast gate with stainless steel electrode, taking out mould core, finishing internal hole of end cover to make it up to required standard. Said method can greatly prolong repaired end cover service life, and can reduce cost.

Description

The method of the inside and outside cast iron end cap of the white cast-iron casting-on hydraulic turbine

What the present invention relates to is the method for the inside and outside cast iron end cap of a kind of white cast-iron casting-on hydraulic turbine.

The inside and outside cast iron end cap of existing hydraulic turbine difference of hardness, service life is short, only just weares and teares to such an extent that be done for three, four months.Newly purchase expensive nearly 20,000 yuan of a cover hydraulic turbine.In order to make full use of the inside and outside end cap of cast iron, people often adopt epoxy resin to add diamond dust reparation, but also can only use one month after repairing, and mend and can not use.

In view of above reason, the objective of the invention is in order to overcome above deficiency, after being provided, a kind of repairing end cap can prolong its service life greatly, the method for the inside and outside cast iron end cap of the white cast-iron casting-on hydraulic turbine that reduces cost.

The object of the present invention is achieved like this:

The method of the inside and outside cast iron end cap of the white cast-iron casting-on hydraulic turbine of the present invention is to remove the scale of waiting to repair on the cast iron end cap, with its external diameter of fire clay processing oven dry with wait to feed a casting the iron end cap preceding diameter of bore that do not wear and tear and equate or smaller core rod, core rod placed wait to repair cast iron end cap endoporus, treat and feed a casting iron end cap and core rod and heat and the white cast-iron molten iron is injected by cast gate after red until burning, with stainless steel electrode cast gate is burn-on behind the cooling and shaping, take out core rod, finishing end cap endoporus makes it to reach required standard.

Before the above-mentioned cast white cast-iron molten iron,, make the white cast-iron of casting-on more can melt into an integral body with end cap tightly waiting to repair several screwed holes of processing on the cast iron end cap endoporus peripheral wall.

The present invention utilizes the characteristic of white cast iron wear-resistant, and itself and end cap are merged into an organic whole, has strengthened the wearability of former end cap greatly, has improved service life, can reach 4～10 years, has reduced use cost, turns waste into wealth.

Introduce embodiments of the invention below:

Fig. 1 is the mold insert structure schematic diagram.

The outer cast iron end cover structure schematic diagram of Fig. 2 for having repaired.

Present embodiment is for repairing the method for outer cast iron end cap, and its step is as follows:

1, remove the scale of waiting to repair on the cast iron end cap with portable emery wheel;

2, beat several holes on the cast iron end cap inner hole wall outside with electric hand drill, be processed into screwed hole then;

3, with fire clay processing model as shown in Figure 1, make the external diameter of the The One On The Chassis column type core rod 2 of its model be slightly less than the outer cast iron end cap endoporus preceding normal inner diameter of not wearing and tearing, the suspension ring of being convenient to lift by crane 3 are arranged on the core rod;

4, the core rod of model is placed the endoporus of waiting to repair outer cast iron end cap, treat and repair outer cast iron end cap and core rod and heat and the pure white mouth molten cast iron of fusion is injected by cast gate after red until burning, with stainless steel electrode cast gate is burn-on behind the cooling and shaping, take out core rod, make it to reach required standard with crushing end cap endoporus.

Claims (2)

1, the method for the inside and outside cast iron end cap of the white cast-iron casting-on hydraulic turbine, this method is to remove the scale of waiting to repair on the cast iron end cap, with its external diameter of fire clay processing oven dry with wait to feed a casting the iron end cap preceding diameter of bore that do not wear and tear and equate or smaller core rod, core rod placed wait to repair cast iron end cap endoporus, treat and feed a casting iron end cap and core rod and heat and the white cast-iron molten iron is injected by cast gate after red until burning, with stainless steel electrode cast gate is burn-on behind the cooling and shaping, take out core rod, finishing end cap endoporus makes it to reach required standard.

2, the method for the inside and outside cast iron end cap of the white cast-iron casting-on hydraulic turbine according to claim 1, it is characterized in that pouring into a mould the white cast-iron molten iron before, waiting to repair several screwed holes of processing on the cast iron end cap endoporus peripheral wall.

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