CN108620520A

CN108620520A - Forge white cast-iron cylinder sleeve

Info

Publication number: CN108620520A
Application number: CN201710204439.XA
Authority: CN
Inventors: 周继礼; 赵历军
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-03-24
Filing date: 2017-03-24
Publication date: 2018-10-09

Abstract

White cast-iron can be forged with a kind of special equipment that can impose three-dimensional compressive stress to white cast-iron.It has four tups for synchronizing centripetal high-frequency strike driven by deviation axis, the link mechanism of fixed rotation center, tup centre is equipped with plug, by the white cast-iron heavy wall pipe for the centrifugal casting of grips being rotating, the annular space formed by tup and plug, it is outer to be hit by tup, it is interior to lean on solid core stick, it generates undergauge and subtracts the axially extending deformation of wall thickness, a passage completes forging process.White cast-iron after forging retains its excellent wear-resisting property, and improves toughness.It is cut through bore hole, honing, re-segmenting with forging white cast-iron long tube, it can high efficiency mass production internal combustion engine cylinder jacket.This cylinder sleeve can greatly prolong internal combustion engine service life and largely save fuel, have great economic benefit.On the automobile having a large capacity and a wide range, especially using high-horsepower diesel engine to have broad application prospects on the aircraft carrier of power, submarine and all kinds of warships.

Description

Forge white cast-iron cylinder sleeve

Technical field：

A kind of new application being related to ancient metal material.

Background technology：

White cast-iron is a kind of ancient metal material cheap and easy to get, since its internal carbon is all with cementite (tri-ferrous carbide) form exists, and cementite is a kind of extremely hard extremely brittle substance, and hardness Hv1200 or more differs nothing with diamond Several, this has cast the extremely hard wear-resisting property of white cast-iron.

Cementite especially in white cast-iron exists in the form of three-dimensional netted, it surrounds spherical ferrite, this is again The extremely brittle feature of white cast-iron is cast.

Technical literatures numerous before this is all recorded white cast-iron in particular and cannot be forged, it is also difficult to carry out machinery plus cut to add Work.

Therefore white cast-iron can only make the coarse wear part directly used after a little castings, and excellent wear-resisting property is not It can be not fully exerted.

Cylinder sleeve is the vital part on internal combustion engine (gasoline engine, diesel engine).

Gap size between the friction pair that cylinder sleeve bore and piston, piston ring are constituted when internal combustion engine, directly affects The working efficiency and fuel consumption of internal combustion engine.

The wear-resisting property quality of these parts especially cylinder sleeve, is directly related to the working life length of internal combustion engine.

Therefore people improve the wear-resisting property of cylinder sleeve by every means.

People are achieved the goal by the chemical composition and heat-treating methods of change cylinder sleeve before this.

But what is used bar none is all the casting of grey cast-iron.

Use dismountable cylinder sleeve (Fig. 1) mostly on large and medium-sized internal combustion engine cylinders.

This thin-wall tube-shaped " work " cylinder sleeve, it is not only easy to maintenance, more because not having to entire cylinder body all with same wear-resisting casting Iron is made and saves cost.

Invention content：

The present invention is smashed the network cementite in white cast-iron by forging method, makes the wear-resisting of spot distribution Particle is no longer to influence the extremely brittle hazard factor of white cast-iron.

By forging, originally besieged ferrite connects, while white cast-iron remains high-wear resistance again Its toughness is improved, machinability is substantially improved.

Forging white cast-iron successfully can be used for making internal combustion engine cylinder jacket.

Description of the drawings：

Attached drawing 1 is cylinder sleeve figure

Fig. 2 is forging white cast-iron special equipment organigram.

The left collets of 1- in figure

The white cast-iron heavy wall pipe of centrifugal casting before 2- forgings

3- induction heaters

4- tups

5- eccentric shafts

6- link mechanisms

7- plugs

8- carrying rollers

The right collets of 9-

10- lengthens guide rail

Specific implementation mode：

White cast-iron to be forged must make its whole bear three-dimensional compressive stress, and being with general forging hammer or forcing press cannot 's.

The present invention designs a kind of novel special equipment (Fig. 2) to implement to forge white cast-iron.

Four tups 4 driven around four groups of eccentric shafts 5, the link mechanism 6 of central symmetry distribution, synchronize centripetal past double action Make, the axis of rotation 0 of eccentric shaft 5 is fixed, forges the cylinder sleeve of different-diameter and need only replace the tup of respective thickness.

The plug 7 there are one internal water cooling is set in the center of four tups, and plug 7 is only with forging when work It rotates and must not axially move.

Its course of work is as follows：

It after the white cast-iron heavy wall pipe 2 of centrifugal casting is heated, is clamped by left collet 1, makees axial feeding in rotation, The annular space for making pipe 2 be formed by tup 4 and plug 7,2 outer surface of pipe are hit by four 4 high-frequencies of tup, inner surface By solid core stick 7, generates undergauge and subtract the axially extending deformation of wall thickness.

After being forged thin pipe length more than tup, just it is clamped by right collet 9, hauls the pipe fitting being swaged into and continue to move ahead.

The requirement of the forging's block dimension and forging ratio that are needed according to cylinder sleeve calculates the diameter for determining the preceding white cast-iron pipe of forging And wall thickness, subtract the axially extending deformation of wall thickness through undergauge, a passage completes forging process.

To prevent the back segment blank temperature not forged reduction, enter sensing heating of the tup side equipped with auxiliary in pipe 2 Device 3, it automatically adjusts power, ensures that pipe is all forged in forging range.

For the pipe fitting bending for preventing long pipe and being swaged into, it is respectively arranged with carrying roller 8 in the left and right sides, it coordinates the fortune of collet It is dynamic to hold up pipe.

Above-mentioned special equipment, which has, lengthens guide rail 10, can the very long forging white cast-iron pipe fitting of industrialized production.

It is cut through bore hole, honing, re-segmenting with the white cast-iron long tube of this forging, it can high efficiency production IC engine cylinder Set.

White cast-iron machinability after forging substantially improves, can turning go out short volume bits；

Notched bar impact strength is almost nil before never forging to increase to 2；

Metallographic minute surface is examined, and cementite Hard Inclusion surface accounts for 40% of surface area or more, remains its excellent wearability Energy；

Especially a small amount of cementite can also be made to resolve into graphite by subsequent heat treatment, graphite itself is fine Lubricant, the pit that the graphite that falls off is formed can also oil storage, more increase the wearability of forging white cast-iron cylinder sleeve.

Internal combustion engine cylinder jacket is after break-in made of forging white cast-iron, Bai Liangru mirrors, and light can shine people, substantially prolongs interior The working life and a large amount of fuel of saving of combustion engine, have great economic benefit.

The chemical composition of white cast-iron is forged in addition to containing C, Si, Mn, P, S conventional element, a small amount of alloy member can also be added Element such as Cr, Mo, can more increase its comprehensive mechanical performance.

Forge white cast-iron cylinder sleeve on the automobile having a large capacity and a wide range, especially using high-horsepower diesel engine as the aircraft carrier of power, It has broad application prospects on submarine and all kinds of warships.

Claims

1. manufacturing internal combustion engine (gasoline engine diesel engine) cylinder sleeve with the white cast-iron after forging.It is characterized in that it will be regarded people in the past For the white cast-iron that cannot be forged, after a kind of novel special equipment forging, the characteristics of remaining white cast iron wear-resistant, and carry Its high toughness, improves its machinability, internal combustion engine cylinder jacket is made with this material, substantially prolonging internal combustion engine makes With the service life, and largely save fuel.

2. based on the new exclusive equipment that forging white cast-iron described in claim 1 need to use, it is characterized in that can be cast to spoken parts in traditional operas Iron imposes three-dimensional compressive stress, it has what four groups of deviation axis by fixing axis of rotation, link mechanism drove to synchronize centripetal high-frequency The tup of strike, tup center are set there are one the plug that can be rotated with forging but not axially move,

What is be forged is the white cast-iron heavy wall pipe of centrifugal casting, it is made axial feeding in rotation, passed through by grips The annular space that tup and plug are formed, outer surface are hit by four tups, and inner surface leans on solid core stick, are generated undergauge and are subtracted wall thickness axis To extensional, forging process can be completed in a passage.

3. there are two collets in left and right based on the special equipment described in claim 2, and there are auxiliary induction heating equipment and carrying roller Equal devices, can forge very long white cast-iron pipe, are processed with the white cast-iron long tube after forging, are cut through bore hole, honing, re-segmenting It cuts, it can high efficiency mass production internal combustion engine cylinder jacket.

4. forging the chemical composition of white cast-iron in addition to containing C, Si, Mn, P, S conventional element, a small amount of alloying element can also be added Such as Cr, Mo can more increase the comprehensive mechanical performance of forging white cast-iron.