CN101603906B - Method for detecting processability of cylinder body casting body - Google Patents
Method for detecting processability of cylinder body casting body Download PDFInfo
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- CN101603906B CN101603906B CN2009100633342A CN200910063334A CN101603906B CN 101603906 B CN101603906 B CN 101603906B CN 2009100633342 A CN2009100633342 A CN 2009100633342A CN 200910063334 A CN200910063334 A CN 200910063334A CN 101603906 B CN101603906 B CN 101603906B
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Abstract
The invention relates to a method for detecting the machinability of a cylinder body casting, which comprises the following steps of adopting the same machining method for a detection object and a standard sample, recording machining amount and comparing the machining amount, and is characterized in that: the detection object directly selects a cylinder body, and the part is the inner cavity of the cylinder barrel of the cylinder body; boring the cylinder body to be detected and the reference cylinder body by using the same boring blade and blades at different angles at the same speed by using a boring machine, and measuring the length of the cylinder barrel to be processed when the tool nose is burnt; the processability is as follows: and calculating the machinability of the cylinder body to be detected according to the ratio of the length of the rough bore hole of the cylinder body to be detected to the length of the rough bore hole of the reference cylinder body. The cylinder rough machining allowance of the boring cutter is 3.1mm, the cutting linear speed V is 39.7m/min, and the cutting feed speed F is 0.19 mm/r.
Description
Technical field
The present invention relates to a kind of processibility of cast body of cylinder body detection method, belong to the metal material processing technical field.
Background technology
Processability (also claiming machinability) refers to that workpiece material carries out the complexity of cut.So-called difficulty or ease, look cut multi-form, require different, different implications are arranged.Measure processability and determine processability based on tool wear, the cutting form of expression, rate of cutting, energy consumption usually.The following denotation approach of domestic common employing:
(1) cutting speed such as the VT that is allowed under durability or the certain durability, VT is domestic the most frequently used processability measurement index.Its implication: when tool life is T, cut the cutting speed that certain material allows, be designated as VT.VT is high more, and then the processability of material better.The desirable T=60min of tool life (30min or 15min).If get T=60min, then VT is write as V60.This denotation approach is widely used in Tool Design and materials processing Journal of Sex Research.
(2) surface quality of workpiece material or surfaceness.This method is mainly used in the evaluation of processing to material.
(3) chip-breaking performance of workpiece material.Cut on the very high process unit of performance requirement disconnected at transfer matic, automatic machine tool, numerically-controlled machine machining center or deep hole drilling machine etc., adopt this method.
(4) required cutting force or the cutting power of workpiece material.When machine power deficiency or system stiffness deficiency, adopt this method.
(5) cutter life.Its implication be new blade from using the one-period of inefficacy, show with the workpiece numerical table usually, show during tool failure that machined surface roughness, size exceed the process stipulation scope.The method of the processability of this expression workpiece material is the most frequently used a kind of method in producing.
In order to solve the deficiency of general materials processing measurement index, when research cast iron materials processability, designed the method for various measurement processabilities abroad, some has become universal method these methods, for example constant feeding cutting force processability method.Measuring principle is for adopting constant feeding lathe tools pressure, feeding load or cutter life or pressure or wear extent or wear-out life are fixed, with the quantity of unit interval cutting metal as the processability index.The method of constant feeding cutting force lathe test material processability is under the condition of constant cutting force, constant cutting output, measure the cutting amount of feeding, on average cut the ratio that the amount of feeding and known materials (being set at standard material) on average cut the amount of feeding by unknown material and multiply by 100, this numerical value is as the processability index, promptly
The application of this method in casting pig and steel is by related data
[6] [7]Obtain valid certificates.U.S. SAE handbook in 1981 first hot rolling cold-drawn carbon steel also marks the steel processability index that detects with this method when marking the steel mechanical property.Western countries generally adopt this method to provide the materials processing index, and especially steel are used very generally, but that the cast iron processability is used is not general, this be because this method detect to as if the standard coupon, foundry goods and coupon processability are variant.
D for example again
0.2The processability method, this method has become NF, has been cast the international casting pig council of technological associations and has adopted (in February, 1969).Measuring principle is, cutter life T is along with cutting speed V changes, and the relationship of the two is: cutting speed V is big more, and cutter life is short more, and in certain cutting speed V variation range, the two presents the inverse ratio linear relationship.In when cutting processing, the merit that cutting is done is used to form new surface and becomes the potential with forms such as lattice deformabilities except 1～2%, has 98～99% to be converted to heat energy, and this heat is spread out of [4] by smear metal, workpiece, cutter, week by medium.In turning, it is about 50～86% that smear metal spreads out of, and it is about 40～0% that lathe tool spreads out of, about 9～% that workpiece spreads out of, and surrounding medium spreads out of about 1%.If adopt high-speed steel tool turning, (0.2～0.3mm), as Fig. 1, when turning speed was brought up to a certain degree, the point of a knife temperature was too high and burn out point of a knife, (is defined as D by measuring maximum turning diameter at less cutting depth
0.2), thereby the processability of definite material.Its measuring method is D
0.2The test of processability index detects and only needs pat---diameter 12～40mm, and minimum 3.0mm is thick.At first in sample centre drill φ 6mm hole (shown in Fig. 2 .1), turning then, lathe tool maintenance " N " rpm and cutting depth are constant, cutter moves with " a " mm revolution to the sample outer rim from the center pit feeding, therefore cutting speed evenly increases, and it is enough high to arrive certain some back cutting speed, to cause tool wear, these wearing and tearing make cutter not work extremely rapidly, produce acutely to tremble.After the test, use to be fixed on the diameter that diameter indicator mensuration cutting depth 0.2mm descends suddenly on the cutter balladeur train, the decline of this degree of depth just in time is that this limit diameter correspondence the processability cutting speed due to blade wore and tore.
Except above-mentioned two kinds of universal methods, cast iron processability researchist is in order to study the various factors that influences processability, various processability evaluation methods have been designed, the processability method is estimated in drilling during as constant pressure and constant, the processability method is estimated in milling, the processability method is estimated in smear metal, and the processability method is estimated in drilling, and these methods have been brought into play vital role in research announcement processability influence factor and rule thereof.
As seen from the above, the method for estimating the cast iron processability is a lot, the processability that these methods have all reflected from a side material.Compare with domestic, because external process unit is good, detection method is many, specially extensively, deeply at cast iron processability research contents.Yet, these processability detection methods, processability that can not fast detecting cylinder block casting body, processability under can not fast detecting cylinder body High-speed machining condition, this is difficult to play effect to improving and controlling cylinder body working properties amount, therefore need the new cylinder body processability detection method of design, to satisfy these requirements.
Summary of the invention
The objective of the invention is for solving fast, accurately detect a kind of processibility of cast body of cylinder body detection method that cylinder body processing characteristics data design.
Technical scheme of the present invention: processibility of cast body of cylinder body detection method of the present invention comprises detected object and standard sample is adopted same job operation, the record processing capacity, compare, its detected object is directly selected cylinder body for use, and the position is the inner chamber of cylinder body cylinder barrel; Use boring machine, with same speed, with the blade boring detected object cylinder body and the benchmark cylinder body at the different angles of same boring cutter sheet, the cylinder barrel length of processing when measuring the point of a knife scaling loss; Processability is: the ratio of checked object cylinder body heavy boring cylinder hole length ÷ benchmark cylinder body heavy boring cylinder hole length calculates checked object cylinder body processability.
Described processibility of cast body of cylinder body detection method, the cylinder body roughing surplus 3.1mm of its boring cutter, cutting linear velocity V=39.7m/min, cutting speed of feed F=0.19mm/r.
Advantage of the present invention: the invention solves the technical barrier that cylinder block casting body processability can't fast detecting, this method detects the cylinder body processability comparatively accurately, this method can be used in the detection of cylinder body processability, the data of its detection can be used for producing check and control to the cylinder body material as the index of weighing the cylinder body processing characteristics.Its testing result can directly reflect the processability of cylinder body, detects the degree of accuracy height, from the cutter life of the data that detect and the actual processing of cylinder body cylinder barrel the two data consistent that has been confirmed.Detection speed is fast.
Description of drawings
Fig. 1 is the special-purpose W18Cr4V high-speed steel four directions blade synoptic diagram that adopts.
Fig. 2 is the longitudinal sectional view of Fig. 1.
Embodiment
Processibility of cast body of cylinder body detection method of the present invention, detected object is directly selected cylinder body for use, and the position is the inner chamber of cylinder body cylinder barrel; Use boring machine, with same speed, with the blade boring detected object cylinder body and the benchmark cylinder body at the different angles of same boring cutter sheet, the cylinder barrel length of processing when measuring the point of a knife scaling loss; Stipulated standard cylinder body processability is 1.00, and processability is: the ratio of checked object cylinder body heavy boring cylinder hole length ÷ benchmark cylinder body heavy boring cylinder hole length calculates checked object cylinder body processability.
The order of this processability method of inspection is the experimental material high-speed cutting performance, because the cut of this form, the principal mode of its tool failure is high temperature scaling loss point of a knife, the blade that weares and teares at a high speed, and when this and cylinder body high speed heavy boring cylinder barrel, the failure mode of cutter is identical, it can reflect the processability of cylinder body cylinder body material when high-speed cutting indirectly, when being this method check processability, the cylinder body that processability is good is when high speed heavy boring cylinder barrel, the also processability that will show, vice versa.
Processability detects example:
Equipment and cutter: horizontal boring machine T611B, knife bar Mohs 6# awl, knife bar diameter phi 86mm, knife rest are the PSKNR/L16CA12 of Dalian Fuji, 15 ° of tool cutting edge angles, main angle of cutting edge--9 °, secondary angle of cutting edge-5 °, relief angle-5 °.
See Fig. 1, Fig. 2: adopt special-purpose W18Cr4V high-speed steel four directions blade, blade size length and width height is 12.7 * 12.7 * 4.76mm, φ 5.16 ± 0.05mm, fillet R0.4mm, 8 angle blades of every cutter, the various angles of cutter, blade size are identical with high speed heavy boring cylinder barrel processing conditions.The high-speed steelknife sheet material adopts same batch of material, identical Technology for Heating Processing manufacturing.
Processability detects cutting parameter: cylinder body roughing surplus 3.1mm, cutting linear velocity V=39.7m/min, cutting speed of feed F=0.19mm/r.
The cylinder body processability detects: blade 1 is installed in the four directions compresses on the knife rest, knife rest is installed in the T611B horizontal boring machine; Cylinder body is installed: cylinder body oil cooler installed surface down, two point locations of side, flange place at the bottom of the cylinder body, the oil cooler face is in the three-point fix of same plane, the centering size is identical with process redundancy around guaranteeing the boring cylinder barrel, and manually the pressing plate cylinder body that has been fixedly clamped cuts from cylinder deck to the crankcase direction then, stop cutting during the point of a knife scaling loss, the cylinder barrel at employing vernier caliper measurement point of a knife scaling loss place is cutting depth, and record cutting depth value is made the tool wear sign.Every kind of cylinder body detects 3.
Cylinder body processability testing result:
Cutting cylinder barrel length and cylinder body processability comparison and detection data are shown in Table 1.
The main discrepancy of the present invention and domestic and international other processability detection method:
By the wear out failure cutter as can be seen, rubbing wear is the principal mode of cylinder barrel tool failure.
Core of the present invention is the foundation that cylinder barrel length that detected object is processed when directly selecting cylinder body for use and measuring the point of a knife scaling loss detects as the cylinder body processability.Therefore, the foundation that the cylinder barrel length of processing when every detected object is directly selected cylinder body for use and measured the point of a knife scaling loss detects as the cylinder body processability, protection scope of the present invention all belonged to.
Claims (2)
1. a processibility of cast body of cylinder body detection method comprises detected object and standard sample is adopted same job operation, and the record processing capacity compares, and it is characterized in that: detected object is directly selected cylinder body for use, and the position is the inner chamber of cylinder body cylinder barrel; Use boring machine, with same speed, with the blade boring detected object cylinder body and the benchmark cylinder body at the different angles of same boring cutter sheet, the cylinder barrel length of processing when measuring the point of a knife scaling loss; Processability is: the ratio of checked object cylinder body heavy boring cylinder hole length ÷ benchmark cylinder body heavy boring cylinder hole length calculates checked object cylinder body processability.
2. processibility of cast body of cylinder body detection method according to claim 1 is characterized in that: the cylinder body roughing surplus 3.1mm of boring cutter, cutting linear velocity V=39.7m/min, cutting speed of feed F=0.19mm/r.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2247963C1 (en) * | 2003-06-16 | 2005-03-10 | Уфимский государственный авиационный технический университет | Method of determining machinability |
| CN101339114A (en) * | 2008-09-03 | 2009-01-07 | 石家庄铁道学院 | Ceramic abrasive machining performance test method and its equipment |
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2009
- 2009-07-28 CN CN2009100633342A patent/CN101603906B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2247963C1 (en) * | 2003-06-16 | 2005-03-10 | Уфимский государственный авиационный технический университет | Method of determining machinability |
| CN101339114A (en) * | 2008-09-03 | 2009-01-07 | 石家庄铁道学院 | Ceramic abrasive machining performance test method and its equipment |
Non-Patent Citations (3)
| Title |
|---|
| 郭全领，等.改善康明斯气缸体加工性初探.《2007年全国铸铁缸体缸盖铸造生产技术研讨会论文集》.2007,115-121. |
| 郭全领.汽缸体加工性问题原因调查与分析.《2005年中国发动机铸件生产技术研讨会文集》.2005,149-162. * |
| 郭全领等.改善康明斯气缸体加工性初探.《2007年全国铸铁缸体缸盖铸造生产技术研讨会论文集》.2007,115-121. * |
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