CN108080602A - A kind of part blank nature cracking technology - Google Patents
A kind of part blank nature cracking technology Download PDFInfo
- Publication number
- CN108080602A CN108080602A CN201711391398.6A CN201711391398A CN108080602A CN 108080602 A CN108080602 A CN 108080602A CN 201711391398 A CN201711391398 A CN 201711391398A CN 108080602 A CN108080602 A CN 108080602A
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- CN
- China
- Prior art keywords
- cracking
- mold
- casting
- swollen disconnected
- part blank
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/009—Casting in, on, or around objects which form part of the product for casting objects the members of which can be separated afterwards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
Abstract
The invention discloses a kind of part blank nature cracking technologies, and magnesium foil is processed flakiness first, is put into mold and fixes according to default cracking position, mold is divided into two cavities；Secondly, mold is preheated, molten metal is melted and flows into two cavities respectively for two bursts of liquid streams；Casting out of mold is taken out after molten metal cooling, and carries out removing surface work；Then the swollen disconnected hole of processing at the default cracking position of casting, and open up splitter at swollen disconnected hole and the cracking interface intersection being pre-designed；Finally swollen disconnected casting is loaded in swollen disconnected hole site.Along preset interface brittle failure subdivision when the present invention cracks part, and ensure that two break surfaces have good engagement and intensity, positioning datum is provided for follow-up ressembling for subdivision body, cracking technique is breached and practical technique is provided to material limitation, there is larger economic benefit.
Description
Technical field
The present invention relates to accelerate to crack and improve the technique of fracture quality more particularly to a kind of part blank cracks work naturally
Skill.
Background technology
Cracking technique is the manufacture state-of-the-art high-accuracy processing technology of subdivision class part, is had been widely used at present in engine
The fields such as connecting rod, crankcase end cover.Cracking technique, which has selection, is strict with, and is ensureing the premise of connecting rod comprehensive mechanical property
Under, the toughness index of limiting rod, it is desirable that material therefor at ambient temperature can brittle fracture characteristic, and formed the plane of disruption will
There is enough intensity, this causes available cracking material to receive greatly to limit to.At present, available cracking material kind analogy in engineering
Relatively limited, the selection of cracking connecting-rod concentrates on high-carbon steel, powdered metallurgical material, malleable cast iron etc., and ordinary steel, aluminium alloy, titanium
The larger material of the toughness such as alloy can not generally be applied to cracking technique.At this stage, ripe cracking material technology of preparing it is complicated,
Material composition control requirement is high, this directly constrains the application and popularization of cracking technique.On the other hand, common cracking material exists
There are many problems in cracking processing：Such as crack deformation, the dislocation of cracking face, cracking face offset, bifurcated, unilateral tear, seam broken etc..
For " bottleneck " problem, improve material property in microalloy processing both at home and abroad, develop new cracking apparatus, optimization cracking
The exploration of parameter etc., but these can not all break through limitation of the cracking technique to selection.
The content of the invention
The technical problems to be solved by the invention are to be directed to the defects of involved in background technology, provide a kind of part hair
Base nature cracking technology.
The present invention uses following technical scheme to solve above-mentioned technical problem
A kind of part blank nature cracking technology, comprises the steps of：
Step 1）, magnesium foil is processed into flakiness, is put into mold and fixes according to default cracking position, mold is split
For two cavities；
Step 2）, mold is preheated；
Step 3）, molten metal is melted and flows into two cavities respectively for two bursts of liquid streams, inflow direction is opposite, it is made to reach magnesium paper tinsel simultaneously
Material both sides are steadily full of two cavities；
Step 4）, casting out of mold is taken out after molten metal cooling, and carries out removing surface work；
Step 5）, the swollen disconnected hole of processing at the default cracking position of casting, and in swollen disconnected hole and the cracking interface phase being pre-designed
Splitter is opened up at friendship；
Step 6）, swollen disconnected casting is loaded in swollen disconnected hole site.
As a kind of further prioritization scheme of part blank nature cracking technology of the present invention, the step 5）In cracking
Slot is V-type splitter.
As a kind of further prioritization scheme of part blank nature cracking technology of the present invention, the V-type splitter is opened
Mouth width degree is 1.5mm, depth 1mm.
As a kind of further prioritization scheme of part blank nature cracking technology of the present invention, the magnesium foil uses thickness
For the AZ31 thin slices of 0.12mm.
The present invention compared with prior art, has following technique effect using above technical scheme：
It is split 1. the present invention makes the part for adding magnesium foil be opened along splitter root, fracture crack is extended along preset boundary layer, shape
Into section it is smooth, plastic-less deformation, fracture color is gloomy, and required swollen disconnected load is small, and cracking separation is easy, without splitting not open, fall
The problems such as slag, fracture facial disfigurement, realize low energy brittle failure；
2. the plane of disruption produced by the present invention, fracture apperance has following feature：Fracture is presented brittleness, has grain boundary fracture feature, has
Lamellar fracture feature；The setting technique in the cracking face meets the requirement of part cracking subdivision, reduces the plasticity of part cracking zone,
The plane of disruption is smooth, and crackle occurs without bifurcated, shift phenomenon；
Along preset interface brittle failure subdivision when 3. the present invention cracks part, and ensure two break surfaces have good engagement with
Intensity provides positioning datum for follow-up ressembling for subdivision body, breaches cracking technique and provides practical skill to material limitation
Art has larger economic benefit.
Description of the drawings
Fig. 1 is mould therefor schematic diagram of the present invention；
Fig. 2 is splitter Working position schematic diagram in technical solution of the present invention；
Fig. 3 is lytic effect schematic diagram of the present invention；
In figure, 1- molds, 2- magnesium foils, 3- mold cavities, 4- splitter Working positions, casting before 5- cracking, the combination of 6- casting
Face, casting after 7- cracking.
Specific embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The present invention can be embodied in many different forms, and should not be assumed that be limited to the embodiments described herein.On the contrary, it provides
These embodiments will give full expression to the scope of the present invention to make the disclosure thoroughly and complete to those skilled in the art.
In the accompanying drawings, for the sake of clarity it is exaggerated component.
The invention discloses a kind of part blank nature cracking technologies, comprise the steps of：
Step 1）, magnesium foil is processed into flakiness, is put into mold and fixes according to default cracking position, mold is split
For two cavities；
Step 2）, mold is preheated；
Step 3）, molten metal is melted and flows into two cavities respectively for two bursts of liquid streams, inflow direction is opposite, it is made to reach magnesium paper tinsel simultaneously
Material both sides are steadily full of two cavities；
Step 4）, casting out of mold is taken out after molten metal cooling, and carries out removing surface work；
Step 5）, the swollen disconnected hole of processing at the default cracking position of casting, and in swollen disconnected hole and the cracking interface phase being pre-designed
Splitter is opened up at friendship；
Step 6）, swollen disconnected casting is loaded in swollen disconnected hole site.
The step 5）In splitter be preferably V-type splitter.The opening width of the V-type splitter is 1.5mm, deep
It spends for 1mm.
The magnesium foil preferentially uses AZ31 thin slice of the thickness for 0.12mm.
Of the invention its cracks face Forming Mechanism overall process：The molten metal of two bursts of relative flows is in magnesium foil both sides in mold
Overlap joint, magnesium foil metal film in vigorous oxidation and Liquid-metal flow forward position in high-temp liquid forms interface, at this time in alloy
Inside forms a low fusing point melt layer for running through entire casting mold, elapses this kind of low melting point liquid phase to crystal boundary with the crystal of growth
Edge, due to the contraction of Interfacial Liquid Membranes, intergranular cannot be smoothed out feeding, just form micro hole, such collective effect most end form
Into cracking interface naturally.
Beneficial effects of the present invention can pass through following description of test：
The mold of the method for the present invention is tested as shown in Figure 1, runner is using single cast gate dual channel form, i.e. a sprue, two
Runner is symmetrical, and guiding molten metal flows into cavity into two bursts of liquid streams are opposite, while reaches both sides of foil, is steadily full of
Two cavities.Cavity bottom is provided with demoulding mandril, realizes the smooth demoulding of casting.For ease of the clamping of magnesium foil on casting mold,
The convex-concave structure of mutual cooperation is set in mold vertical-parting face.
It is connecting rod material that experiment material, which selects the LD10 alloys that fusing point is 660 DEG C, and it is 0.12mm's that magnesium foil, which selects thickness,
AZ31 thin slices, fusing point are 649 DEG C.Casting takes rectangular specimen with wire cutting, and size is 40mm × 30mm × 20mm, default
φ 14mm circular holes are opened at cracking position, and cutting width is 1.5mm at swollen disconnected hole and the cracking interface intersection being pre-designed, it is deep
For the V-type splitter of 1mm, then apply swollen disconnected load in circular hole, it is made to be broken along brittle interface, as shown in Figure 2.
The casting prepared under above-mentioned condition is taken, cracking subdivision is carried out using swollen disconnected method, the sample under swollen disconnected load effect
It splits along interface, as shown in figure 3, its macrofracture feature：Section is smooth, and plastic zone deformation is small.Under the same conditions, to not adding
The base material casting for entering magnesium foil carries out cracking subdivision, is compared with the former, and the fracture of the two is main to show there are notable difference
：
（1）The position of crack start is cracked, the sample for adding magnesium foil is opened along splitter root and split, and fracture crack is along preset interface
Layer extension, the section of formation is smooth, plastic-less deformation, and crack initiation position has randomness during base material cracking, and section plasticity is big；
（2）Fracture color, the fracture color of addition magnesium foil is gloomy, and the fracture of base material is bright；
（3）Breaking strain, swollen disconnected load needed for the sample of addition magnesium foil is small, and cracking separation is easy, and nothing is split not open, is scaling-off, is disconnected
The problems such as broken face deforms, realizes low energy brittle failure, and during the swollen fracture solution of base material, plane of disruption out-of-flatness, fracture facial disfigurement is big, and institute
Need swollen disconnected load big.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein（Including skill
Art term and scientific terminology）With the identical meaning of the general understanding with the those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that with in the context of the prior art
The consistent meaning of meaning, and unless defined as here, will not be explained with the meaning of idealization or overly formal.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further
It is described in detail, it should be understood that the foregoing is merely the specific embodiments of the present invention, is not limited to this hair
Bright, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection domain within.
Claims (4)
1. a kind of part blank nature cracking technology, which is characterized in that comprise the steps of：
Step 1）, magnesium foil is processed into flakiness, is put into mold and fixes according to default cracking position, mold is split
For two cavities；
Step 2）, mold is preheated；
Step 3）, molten metal is melted and flows into two cavities respectively for two bursts of liquid streams, inflow direction is opposite, it is made to reach magnesium paper tinsel simultaneously
Material both sides are steadily full of two cavities；
Step 4）, casting out of mold is taken out after molten metal cooling, and carries out removing surface work；
Step 5）, the swollen disconnected hole of processing at the default cracking position of casting, and in swollen disconnected hole and the cracking interface phase being pre-designed
Splitter is opened up at friendship；
Step 6）, swollen disconnected casting is loaded in swollen disconnected hole site.
2. part blank nature cracking technology according to claim 1, which is characterized in that the step 5）In splitter
For V-type splitter.
3. part blank nature cracking technology according to claim 1, which is characterized in that the opening of the V-type splitter
Width is 1.5mm, depth 1mm.
4. part blank nature cracking technology according to claim 1, which is characterized in that the magnesium foil use thickness for
The AZ31 thin slices of 0.12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711391398.6A CN108080602A (en) | 2017-12-21 | 2017-12-21 | A kind of part blank nature cracking technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711391398.6A CN108080602A (en) | 2017-12-21 | 2017-12-21 | A kind of part blank nature cracking technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108080602A true CN108080602A (en) | 2018-05-29 |
Family
ID=62177956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711391398.6A Pending CN108080602A (en) | 2017-12-21 | 2017-12-21 | A kind of part blank nature cracking technology |
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| Country | Link |
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| CN (1) | CN108080602A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4432122A (en) * | 1980-10-08 | 1984-02-21 | Daido Metal Co. Ltd. | Method for producing a connecting rod for a radial piston motor |
| US4884900A (en) * | 1986-05-03 | 1989-12-05 | Ford Motor Company | Fracture splitting of light metal components |
| GB2296752A (en) * | 1995-01-09 | 1996-07-10 | Fischer Georg Fahrzeugtech | Method of manufacturing a connecting rod |
| US20020148325A1 (en) * | 2001-04-13 | 2002-10-17 | Bergsma S. Craig | Semi-solid formed, low elongation aluminum alloy connecting rod |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
| CN102626777A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| CN103009020A (en) * | 2012-12-31 | 2013-04-03 | 江苏大学 | Manufacturing method for steel cracking connecting rod |
| CN107239612A (en) * | 2017-06-05 | 2017-10-10 | 吉林大学 | A kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction |
-
2017
- 2017-12-21 CN CN201711391398.6A patent/CN108080602A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4432122A (en) * | 1980-10-08 | 1984-02-21 | Daido Metal Co. Ltd. | Method for producing a connecting rod for a radial piston motor |
| US4884900A (en) * | 1986-05-03 | 1989-12-05 | Ford Motor Company | Fracture splitting of light metal components |
| GB2296752A (en) * | 1995-01-09 | 1996-07-10 | Fischer Georg Fahrzeugtech | Method of manufacturing a connecting rod |
| US20020148325A1 (en) * | 2001-04-13 | 2002-10-17 | Bergsma S. Craig | Semi-solid formed, low elongation aluminum alloy connecting rod |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
| CN102626777A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of composite double-metal cracking connecting rod |
| CN103009020A (en) * | 2012-12-31 | 2013-04-03 | 江苏大学 | Manufacturing method for steel cracking connecting rod |
| CN107239612A (en) * | 2017-06-05 | 2017-10-10 | 吉林大学 | A kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction |
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Application publication date: 20180529 |
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