CN1095409C

CN1095409C - New casting method for internal-combustion rock driller head

Info

Publication number: CN1095409C
Application number: CN00101744A
Authority: CN
Inventors: 黄德发
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-21
Filing date: 2000-01-21
Publication date: 2002-12-04
Anticipated expiration: 2020-01-21
Also published as: CN1260255A

Abstract

The present invention discloses a new casting method for an internal-combustion rock driller head. By using a precision casting technology and adopting an abnormal operating method, the end surface of a heavier large step hole is placed and fixed upward, and one end of a smallest step hole is placed and fixed downward; a casting port is designed above the end surface of the large step hole. Thus, the cast head has smooth and beautiful appearance surface, the head body has less casting flaws, such as air holes, loosening, slag inclusion, etc., and the product has little machining allowance, little disability quantity and low disability rate, and therefore, the present invention has the advantages of casting cost reduction and obvious economic and social benefits.

Description

The internal-combustion rock driller head casting method

The present invention relates to a kind of casting method of rock driller head, particularly relate to a kind of method of internal-combustion rock driller head casting.

The head of rock drill is the important foundation part on the rock drill product, it not only will have enough intensity and toughness, also must possess good wearability, domesticly in decades cast the type blank with aluminium alloy sand always, refill a tight fit steelwork gland during processed finished products, the production cost of head just improves greatly like this, and indivedual producers cancellation steelwork gland is also arranged in recent years, and use spheroidal graphite cast-iron sand casting forming technology instead, but adopt this method production, the product rejection amount is big, the scrappage height, allowance is big, the manufacturing cost height, the head pts wt is too bigger than original increase, and the product inherent quality is bad, casting flaw is more, and contoured surface is coarse too.

Purpose of the present invention will provide a kind of production technology simple exactly, and the learies of product is little, and allowance is little, and scrappage is low, and low cost of manufacture is in light weight, and the product material is good, and casting flaw is few, the internal-combustion rock driller head casting method that smooth outer surface is attractive in appearance.

Internal-combustion rock driller head casting method of the present invention is achieved like this, and it adopts precision casting process, and the gate location of its molten iron is above the endface position of an axle center stepped hole at head two ends.

Preferred molten iron gate location is arranged on the endface position top of the big stepped hole in head axle center.

The molten iron gate location is arranged on the endface position top in the small stair hole in head axle center.

The present invention is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is internal-combustion rock driller head casting schematic diagram of the present invention.Among the figure:

1, cast gate; 2, big stepped hole; 3, inferior stepped hole; 4, the small stair hole; 5, the molten iron passage; 6, head.

As shown in Figure 1, internal-combustion rock driller head casting method schematic diagram adopts precision casting process, below main summary use lost wax casting process flow process:

The design of part blank spare design → pouring technology design → pressure wax-pattern is come out of the stove → stokehold nodularization → moulding by casting → heat treatment → surface treatment → machining with manufacturing → wax-pattern making → formwork heating (furnace charge alloy preparation) → molten alloy → formwork.

The endface position top that is arranged on the big stepped hole 2 in head 6 axle center with the position of preferred technical method cast gate 1 is that example illustrates its method of operating and process below:

With the end in the small stair hole 4 of the formwork shell mould of head 6 downwards and pre-buried fixing, the big stepped hole 2 of head 6 is upwards poured melted molten iron into through cast gate 1, and molten iron flows into through the molten iron passage 5 of big stepped hole 2.Process conditions: control cast gate hurdle sectional area is 1200～19800mm ², the shell mould heating-up temperature is 750 ℃～850 ℃, is incubated 2.5～3.5 hours, the molten alloy temperature is 1350 ℃～1550 ℃, the alloy spark occurs up to the molten iron surface, promptly comes out of the stove, the stokehold nodularization adopts lid to bury nodulizer and the ferrosilicon mode is carried out, and carries out late inoculation and handle; Annealing process is adopted in heat treatment.

The method of operating of endface position top that gate location is arranged on small stair hole, head 6 axle center 4 is the same substantially, just that an end of the big stepped hole 2 of head 6 formwork shell moulds is downward, an end in small stair hole 4 upwards, other operation and process conditions are all the same.

Internal-combustion rock driller head casting method of the present invention is because the main preferred version that adopts is with head Big end surface of step hole upwards, and the cast gate design is above big end surface of step hole, minimum little The rank hole end surface is downward, and according to convention, better for the technology stability that makes head, head is existed Be difficult for during cast producing deflection, molten iron is easily poured into a mould inflow, all is that the weight of head is heavier generally The end face of big stepped hole place downwards, and the small stair hole is upwards placed, cast gate is arranged on little The position, two sides of stepped hole, that is as the inflow entrance that waters molten iron, adopt this conventional method Cast easily causes the gas in the shell to be difficult for discharging, and the two sides in small stair hole also will be passed through into one The machining processes in step, thereby increased the production and processing expense, and outward appearance is coarse, scrappage Height, and this method production of using anti-convention to operate, gas easily is discharged from during cast, on the head Be difficult for producing pore, the two sides one-shot forming in the small stair hole of head does not need machinery to add again The worker, thereby make this method have following advantage: 1. production technology is simple, and 2. the product rejection amount is little, Scrappage is low, and 3. allowance is little, and is in light weight, and production cost is low, and 4. the product inherent quality is good, Smooth outer surface is attractive in appearance.

Claims

1, a kind of internal-combustion rock driller head casting method adopts precision casting process, it is characterized in that: the cast gate of molten iron (1) position is arranged on the endface position top of an axle center stepped hole at head (6) two ends.

2, internal-combustion rock driller head casting method according to claim 1: it is characterized in that cast gate (1) position of molten iron is arranged on the endface position top of the big stepped hole in head (6) axle center (2).

3, internal-combustion rock driller head casting method according to claim 1: it is characterized in that the position of molten iron cast gate (1) is arranged on the endface position top in small stair hole, head (6) axle center (4).