CN2271938Y

CN2271938Y - Column geared drill for cast steel and spherical cast iron

Info

Publication number: CN2271938Y
Application number: CN 95219792
Authority: CN
Inventors: 孙海林; 孙进平
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-19
Filing date: 1995-08-19
Publication date: 1998-01-07
Anticipated expiration: 2005-08-19

Abstract

The utility model relates to a column tooth drill bit for cast steel and spheroidal graphite cast iron which are used in mines. The utility model is characterized in that the figure of the column tooth drill bit adopts metal type fine casting, the mechanical property and the quality of the column tooth drill bit are enhanced, accuracy of the column tooth drill bit can reach the grade of CT 8 to 9, and service life of the column tooth drill bit is enhanced. The main ventilation hole of the column tooth drill bit is directly cast out through the sand core with supporting and positioning, mechanical processing is reduced, and cost is low. The core bar of the sand core is made of an iron pipe which is provided with a plurality of small holes, a cup-shaped sand shell is arranged outside the pipe wall, the most lower end of the iron pipe is provided with a positioning sleeve which is supported by bars, and the center of the positioning sleeve is provided with supporting iron. A knock-off positioning piece is provided with two arc-shaped ingates, two side vent holes and a sand core positioning hole, the two side vent holes are communicated with a side vent hole of a riser sand box, so the utility model has the advantages of convenient molding and high rate of finished products.

Description

A kind of cast steel, cylindrical toothed drill of nodular graphite cast iron

The utility model relates to a kind of cast steel, cylindrical toothed drill of nodular graphite cast iron.

Columnar drill is big in the mine use amount, and consumption is also big.It is reported to consume about 60,000 in national year by only major diameter columnar drill, each average price reaches over thousands of unit, will consume every year about 6,000 ten thousand yuan, and is costly.

At present, there are two major defects in cylindrical toothed drill of nodular graphite cast iron: the one, and the columnar drill profile exists the low and shortcomings such as fineness is poor, the crystallization of columnar drill internal soundness difference is thick, sand holes, shrinkage porosite, core of dimensional accuracy.The 2nd, columnar drill main ventilation hole is solid, not only have solid cast waste molten iron, and columnar drill exists also shrinkage cavity, sand holes, machining to waste a series of shortcomings such as man-hour.Now relevant for cylindrical toothed drill of nodular graphite cast iron is carried out improved report.For example: by resin sand core columnar drill main ventilation hole is directly cast out, this is a much progress, but has the sand removal difficulty; Columnar drill main ventilation hole gas extraction system is obstructed, and easily produces core; Running gate system is side cast, and MOLTEN STEEL FLOW is rapid, and sand mold is caused excess impact, causes sand washing, produces a series of shortcomings such as sand holes.

Up to the present, yet there are no report about the cast steel columnar drill.

The purpose of this utility model is to overcome the shortcoming that existing columnar drill exists, and proposes a kind of cast steel, cylindrical toothed drill of nodular graphite cast iron.

The utility model is to realize like this.Its main points are that the columnar drill profile adopts metal mold.Columnar drill main ventilation hole has the core that supports the location directly to cast out by one.Core is done arbor by the iron pipe that has many apertures, and tube wall outside is a glass molding sand shell, iron pipe have the positioning sleeve that supports by muscle bottom, the positioning sleeve center is placed with support iron.Support ferropexy in nowel bottom centre hole.Easily cut spacer and have two arc ingates, two side steam vents and core locating hole.Two side steam vents communicate with the side steam vent of rising head sandbox.Two arc ingates communicate with the pouring basin of rising head sandbox.The upper end of iron pipe arbor is ganged up mutually with the sand cover.

Compared with prior art, the utlity model has following advantage: (1) columnar drill profile adopts metal mold, has improved the mechanical property of foundry goods, and wherein impact flexibility improves 30%-40%, improved the dimensional accuracy and the fineness of foundry goods, the foundry goods precision can reach the CTB-9 level.(2) columnar drill main ventilation hole directly casts out by 2 cores that support the location are arranged, and has simplified process for machining, has reduced cost, surplus each columnar drill on average reduces by 40 yuan.(3) adopt the iron pipe that has a lot of apertures to do arbor, rigidity, the moulding that has improved core is easy, exhaust is smooth and easy, sand removal is convenient, eliminated core.(4) the arc ingate that adopts bilateral symmetry to arrange, cavity filling process is steady, and the foundry goods heat distribution is reasonable, helps the discharge of gas, has improved product quality, makes yield rate improve 20%.

Below in conjunction with accompanying drawing utility model is described in further detail.

Fig. 1 is the utility model formative technology figure.

Fig. 2 easily cuts spacer A-A profile.

Fig. 3 easily cuts the spacer vertical view.

Fig. 4 is the core profile.

Fig. 5 is a rising head sandbox vertical view.

1, metal mold, 2, support iron, 3, core, 4, iron pipe arbor, 5, the central row pore, 6, aperture, 7, easily cut spacer, 8, the rising head sandbox, 9, the sand cover, 10, pouring basin, 11, the arc ingate, 12, the side steam vent, 13, core locating hole, 14, the side steam vent, 15, positioning sleeve, 16, cup molding sand shell, 17, mo(u)ld bottom half bottom centre hole.

Embodiment:

Its columnar drill profile of the utility model adopts metal mold 1.Columnar drill main ventilation hole directly casts out by the core 3 that supports the location is arranged.Core 3 is done arbor 4 by the iron pipe that has a lot of apertures 6, and tube wall outside is a glass molding sand shell 16, iron pipe have the positioning sleeve 15 that supports by muscle bottom, there is the iron 2 of support at positioning sleeve 15 centers.Easily cutting spacer 7 has two arc ingates 11, two side steam vents 12 and 13, two side steam vents 12 of core locating hole and communicates with the side steam vent 14 of rising head sandbox 8.The upper end of iron pipe arbor 4 is ganged up mutually with sand cover 9, and the hole of iron pipe arbor 4 is a central row pore 5.In drill bit top machined boring, in the hole, join the edge alloy column.

Claims

The principal character of a kind of cast steel, cylindrical toothed drill of nodular graphite cast iron is that the columnar drill profile adopts the smart casting of metal mold; Columnar drill main ventilation hole directly casts out by the core 3 that supports the location is arranged, and sand mold 3 is done arbor 4 by the iron pipe that has a lot of apertures, and the tube wall outside is a glass molding sand shell, iron pipe have the positioning sleeve 15 that supports by muscle bottom, positioning sleeve 15 centers have one to support iron; Easily cutting spacer 7 has two arc ingates 11, two side steam vents 12 and 13, two side steam vents 12 of core locating hole and communicates with the side steam vent 14 of rising head sandbox 3; The upper end of iron pipe arbor 4 is ganged up mutually with sand cover 9.