CN103290325A

CN103290325A - Perforating charge body powder metallurgy billet and cold extrusion forming process method

Info

Publication number: CN103290325A
Application number: CN2013102500534A
Authority: CN
Inventors: 戴建东; 李大勇; 李峰; 周大伟
Original assignee: HEILONGJIANG SERVICE CENTER FOR SMALL AND MEDIUM-SIZED ENTERPRISES
Current assignee: HEILONGJIANG SERVICE CENTER FOR SMALL AND MEDIUM-SIZED ENTERPRISES
Priority date: 2013-06-21
Filing date: 2013-06-21
Publication date: 2013-09-11
Anticipated expiration: 2033-06-21
Also published as: CN103290325B

Abstract

The invention relates to a perforating charge body powder metallurgy billet and a cold extrusion forming process method, and belongs to petroleum exploitation tools. The billet is formed through compatibility of iron powder, copper powder, nickel powder, graphite powder, molybdenum powder and a binder according to different weight ratios, mechanical mixing, pressing and sintering are performed on the raw materials to prepare a charge body billet, cold extrusion is adopted to carry out extrusion on the whole charge body billet to obtain a charge body with the final shape, and sintering and precise pressing shaping are performed to obtain the perforating charge body. According to the present invention, the low alloy content powder metallurgy formula and the cold extrusion technology are adopted to process the charge body, and the following characteristics are provided, wherein the characteristics are that the material formula is novel, scientific and reasonable property is provided, mechanical property of the charge body is good, a penetration depth value of the perforation is large, use is safe and reliable, the production process is simple, the cost is low, perforating operation efficiency is increased, and petroleum exploitation cost is reduced.

Description

Perforating bullet body powder metallurgy blank and cold extrusion technology method

Technical field

The invention belongs to the oil production instrument, relate generally to downhole perforation bullet airframe material and body forming and machining method that a kind of oilfield exploitation uses.

Background technology

The oil field perforation bullet is a kind of for improving the downhole perforation instrument that the oil field oil-production efficiency uses.Body is the key part of perforating bullet, and main effect is to strengthen perforating bullet side direction detonation wave momentum, improves the kinetic energy of metal jet, delays and reduces rarefaction wave to the interference of metal jet, the assurance perforating depth.Practice shows, body intensity more the high perforation bullet to wear dark value more big, therefore improving body intensity is to improve perforating bullet to wear one of dark effective way.Traditional body working method mainly contains mechanical workout and two kinds of methods of cold extrusion processing.Because the body structure more complicated, machining cost is high, and production efficiency is low, do not satisfy needs of production, though adopt cold extruding technique to improve production efficiency, production cost is reduced relatively, but airframe material is selected to be very limited, at present can only be with 20 ^#Steel is made body by cold extrusion, and 20 ^#Steel bomb body mechanical property is lower, and perforation is worn dark instability, and body blast back chip size is bigger, and card well accident very easily takes place, and increases the fishing operation cost.For solving the problem that above-mentioned conventional art exists, Heilongjiang Machinery Industry Institute has researched and developed a kind of perforating bullet body and making method of mmaterial, because mainly relying on, this method adds powder metallurgy element and resintering reinforcement matrix and performance, therefore its powder metallurgy prescription has adopted high alloy content proportioning, make body by repressing and re-sintering technology, the powder metallurgy body density of finished product is less than 7.3g/cm ³, the body performance need improves.

Summary of the invention

Purpose of the present invention is exactly the problem that exists at above-mentioned prior art, research and develop a kind of new perforating bullet body powder metallurgy blank and cold extrusion technology method, reach the performance that improves body, guarantee that perforation wears deeply, reduces the purpose of process for processing operation, reduction body manufacturing cost.

The object of the present invention is achieved like this: perforating bullet body powder metallurgy blank by iron powder, copper powder, nickel powder, Graphite Powder 99, molybdenum powder and binding agent by weight compatibility form, the shared weight percent of each composition is: copper powder 0.3-0.9%, nickel powder 0.3-0.9%, Graphite Powder 99 0.4-0.7%, molybdenum powder 0.3-0.9%, binding agent 0.5-0.9%, surplus is iron powder.

A kind of perforating bullet body cold extrusion technology method as above-mentioned prescription: iron powder, copper powder, nickel powder, molybdenum powder, Graphite Powder 99 and binding agent are weighed respectively by prescription, be prepared into mixed powder through mechanical batch mixing; Mixed powder is put into powder forming mould press forming, and pressing pressure is 600-800MPa, and makes the body blank with certain intensity through sintering, and sintering temperature 1000-1100 ℃, body blank pressed density is 7.1-7.2g/cm ³, be incubated 1-2 hour; By cold extrusion the elasticity blank is carried out monolithic extruded its generation viscous deformation that makes then, total squeeze pressure is the 280-320 ton, obtains the body of net shape; Body to net shape carries out sintering and accurate compacting shaping, sintering temperature 1100-1200 ℃, soaking time 1-2 hour at last; Be met the perforating bullet body of mechanical property requirement and dimensional precision, body density is greater than 7.5g/cm ³

The present invention adopted the powder metallurgy pressing manufacturing process of low-alloy content to make a body powder blank with definite shape of design in advance before this, adopt cold extruding technique that the body powder blank of low-alloy content prescription is carried out extrusion molding again, make body powder blank generation directed flow and vast scale viscous deformation, improve the global density of body powder blank; And by powder metallurgy sintered technology alloying element is fully spread, and strengthen tissue and the performance of airframe material, obtain to have high-density and high-intensity powder metallurgy body; By the adjustment of sintering process parameter being controlled distribution and the form of body mesoporosity, make the fragment after the powder body explodes more tiny simultaneously, avoid card well accident to take place.The present invention can an extrusion molding, broken through that traditional body cold-extrusion technology needs twice extrusion molding and in the restriction of material application facet, simultaneously also broken through the restriction of existing powder metallurgy body aspect density, had that material prescription is scientific and reasonable, body mechanical property height, perforation wear that dark value is big, safe and reliable, production technique is easy, cost is low, can improve perforation job efficient, reduce the characteristics of cost for oil production.

Description of drawings

Fig. 1, Fig. 2 are two kinds of perforating bullet powder metallurgy body blank structure synoptic diagram;

Fig. 3 is perforating bullet body structure synoptic diagram.

Embodiment

Give an actual example below and describe the present invention.

Take by weighing 6 kilograms of copper powders, 6 kilograms of nickel powders, 5 kilograms of Graphite Powder 99s, 6 kilograms of molybdenum powders, 7 kilograms of binding agents, 970 kilograms of iron powders, amount to 1000 kilograms standby, the per-cent that each composition accounts for gross weight is followed successively by 0.6%, 0.6%, 0.5%, 0.6%, 0.7% and 97%.Iron particle size is less than 200 orders, and copper powder, nickel powder, Graphite Powder 99, molybdenum powder and binding agent granularity are less than 300 orders.Add man-hour, put into mixer and under 60 rev/mins of rotating speeds, mixed 1 hour preparing standby powder, be prepared into mixed powder; Mixed powder is made the body blank by the body weight weighing by mould compression moulding, sintering, and pressing pressure is 600-800MPa, and the blank pressed density is 7.1-7.2g/cm ³, sintering temperature is 1000---1100 ℃, be incubated 1-2 hour; Body blank integral body behind the sintering is carried out cold-pressing deformation improve density, and sintering obtains the body of net shape again, total squeeze pressure is the 280-320 ton, and sintering temperature is 1100-1200 ℃, and soaking time 1-2 hour, body density was greater than 7.5g/cm ³, at last body is carried out precision truing, be met the body of mechanical property and dimension precision requirement.

Claims

1. perforating bullet body powder metallurgy blank, it is characterized in that described powder metallurgy blank by iron powder, copper powder, nickel powder, Graphite Powder 99, molybdenum powder and binding agent by weight compatibility form, the shared weight percent of each composition is: copper powder 0.3-0.9%, nickel powder 0.3-0.9%, Graphite Powder 99 0.4-0.7%, molybdenum powder 0.3-0.9%, binding agent 0.5-0.9%, surplus is iron powder.

2. a perforating bullet body cold extrusion technology method as claimed in claim 1 is characterized in that iron powder, copper powder, nickel powder, molybdenum powder, Graphite Powder 99 and binding agent are weighed respectively by prescription, is prepared into mixed powder through mechanical batch mixing; Mixed powder is put into powder forming mould press forming, and pressing pressure is 600-800MPa, and makes the body blank with certain intensity through sintering, and sintering temperature 1000-1100 ℃, body blank pressed density is 7.1-7.2g/cm ³, be incubated 1-2 hour; By cold extrusion the elasticity blank is carried out monolithic extruded its generation viscous deformation that makes then, total squeeze pressure is the 280-320 ton, obtains the body of net shape; Body to net shape carries out sintering and accurate compacting shaping, sintering temperature 1100-1200 ℃, soaking time 1-2 hour at last; Be met the perforating bullet body of mechanical property requirement and dimensional precision, body density is greater than 7.5g/cm ³