CN104690511A - Slender and thin-walled step hole type inner-circle and outside-square structure finish machining method - Google Patents
Slender and thin-walled step hole type inner-circle and outside-square structure finish machining method Download PDFInfo
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- CN104690511A CN104690511A CN201510077644.5A CN201510077644A CN104690511A CN 104690511 A CN104690511 A CN 104690511A CN 201510077644 A CN201510077644 A CN 201510077644A CN 104690511 A CN104690511 A CN 104690511A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention relates to a slender and thin-walled step hole type inner-circle and outside-square finish machining method, belongs to the technical field of non-ferrous metal finish machining in the field of machining and aims to provide a method for machining a thin-walled rod part which can machine high-precision stainless steel materials and adopts an inner-circle and outside-square semi-blind hole structure. According to the technical scheme, inner hole machining is realized according to the following steps: step 1, performing a rough turning process on an inner circle; step 2, performing half finished turning, finished turning and precision grinding processes on the inner circle in the step in sequence; step 3, performing artificial aging treatment on the excircle in the step 2; step 4, honing an inner hole by using a honing tool. Outside processing is performed according to the following steps: step 1, clamping a workpiece by adopting a combined clamp; step 2, positioning an outside square machining benchmark through a core shaft; step 3, performing line cutting on the outside square; step 4, performing artificial aging treatment on the outside square in the step 3; step 5, performing half fine grinding on the outside square; step 6, performing fine grinding on the outside square. The slender and thin-walled step hole type inner circle and outside structure precision machining method provided by the invention is applied to inner circle and outside square finish machining.
Description
Technical field
The outer square structure method for fine finishing of slender type, thin-walled stepped hole type inner circle, belongs to the non-ferrous metal finishing technology field in field of machining.
Background technology
Because wall is thin, poor rigidity, easily there is distortion, cutter phenomenon of shaking in thin-walled component of rod category, more difficult with conventional method processing in processing, crudy is difficult to ensure.Following processing method is generally adopted to this kind of part: a. goes surplus first; B. endoporus is worked into size; C. layering turning, approaches intended size; D. mandrel turning is joined.The domestic processing to thin-walled component of rod category at present, mainly common alloy steel, inside and outside be circular cover parts, for the thin-walled component of rod category of stainless steel, the outer square half-blind hole structure of inner circle, adopt general processing method realizability not strong.
This workpiece of thin-walled component of rod category for stainless steel, the outer square half-blind hole structure of inner circle can be summarized as super large draw ratio slender rod type structure, slender type endoporus is always processes difficult point, and be again staircase structural model, causing that other end oral area is less cannot chip removal smoothly, makes iron filings especially easily scratch square set inwall; Require relative to the symmetry of workpiece inner circle to be 0.01 during foreign side's grinding, mandrel is as the benchmark of grinding foreign side, can only at one end locate, because square set external structure is circle one end side, one end, location, one end is difficult to ensure Workpiece Machining Accuracy, and the clamping tooling of employing is that equipment carries flat-nose pliers, and precision is about 0.02, be not very desirable, generally speaking foreign side's grinding is difficult to ensure symmetry.
Honing technique is a kind of special shape of grinding, is again a kind of high-efficiency machining method in fine finishining.This technique is a kind of effective processing method improving parts size precision, geometrical precision and surface roughness, a kind of using machined surface as guide-localization face, under certain feed pressure, remove surplus by the relative motion of instrument (oilstone) and part, its Cutting trajectory is efficient, the precise machining process of overlapping curve.For through hole part, its standard honing core shaft (machine tool accessory) head position all designs and exceeds oilstone front end face, and the object of design is like this exactly when top gem of a girdle-pendant hole, and its mandrel head can be used as top gem of a girdle-pendant hole guiding and uses.If adopt honing technique processing through hole generally can meet technological requirement, but blind-hole type step hole workpiece is a technical barrier for honing technique, even if use best equipment, processing blind hole all can be more much more difficult than processing through hole.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can machining high-precision stainless steel, the outer square half-blind hole structure thin-walled component of rod category of inner circle processing method.
For solving the problems of the technologies described above, the technical solution used in the present invention: the outer square structure method for fine finishing of slender type, thin-walled stepped hole type inner circle, interior hole machined carries out according to following steps:
The first step, perform rough turn operation to foreign round, and strengthen cylindrical surplus 2mm in rough turn operation;
Second step, half finish turning, finish turning, precision grinding process are performed successively to the cylindrical after the first step;
3rd step, perform artificial aging process to the cylindrical after second step, aging temp is 125 degree, and the time is 6 hours;
4th step, use hone Hole honing;
5th step, car mandrel;
6th step, half fine cylindrical;
7th step, fine cylindrical;
Foreign side's processing is carried out according to following steps:
The first step, employing built-up jig clamping workpiece;
Second step, by mandrel location foreign side machining benchmark;
3rd step, Linear cut foreign side;
4th step, perform artificial aging process to the foreign side after the 3rd step, aging temp is 125 degree, and the time is 6 hours;
5th step, partly refine foreign side;
6th step, in advance fine grinding mill car platform plane, then refine foreign side, under the constant prerequisite of rotating speed, cutting output is decided to be 0.005mm, and grinding process constantly uses diamond tool grinding wheel.
Compared to the prior art the present invention has following beneficial effect.
One, be the roughness of hole machined in ensureing, standard hone concordant with bottom oilstone after processing inner circle adopts topping, even if under oilstone and mandrel all abrasion condition, carve sub-hook when being risen outward by oilstone, carve sub-hook front portion and should not exceed front tool face.Even if when load pressure and change in location, carving sub-hook, all must to contact the wider two place's bearings of distance on oil stone base stable with what keep oilstone when honing.On oil stone base, these two bearings separated can prevent oilstone inclination and one end from upwarping. and oilstone can not exceed honing core shaft and lead boots leading section when swelling.Oilstone adopts the higher hardhead oilstone of hardness, to offset the unnecessary stock removal when honing blind hole needed for this part oilstone; Oilstone on hone and lead boots and inner hole of workpiece is that three point contact is with the stability of holding workpiece on hone in radial direction. the constant pressure of hone by setting, even if when removing surplus aperture and increasing, also can make oilstone and lead boots stably to act on inner hole of workpiece on the surface, thus maintain the stability of part in process;
For ensureing the cylindricity of interior hole machined, suitably strengthening cylindrical surplus 2mm and making up the form and position tolerance that instrument produces in preceding working procedure, in addition, after roughing, before semifinishing and fine finishining, increase Ageing Treatment respectively, to discharge machining stress, Reducing distortion;
Detect by cylindricity instrument internal hole cylindricity and roughness after machining, all meet drawing requirement be not more than 0.01 cylindricity requirement, and be not more than the roughness requirements of 0.4.Repeatedly production practices prove, adopt honing technique of the present invention fundamentally can solve general turnery processing because arranging the scuffing barrel problem of cutting and causing.
Two, square set is adding man-hour, and mandrel is as the benchmark of grinding foreign side, and traditional approach is location, one end, and the present invention, by realizing location, two ends to the mandrel one end section of adding cylindrical, good positioning effect, makes the machining accuracy of the outer square structure in the middle of grinding greatly improve; After grinding completes, lengthening section is removed, easy to use;
The clamping tooling adopted during current grinding is that equipment carries flat-nose pliers, precision is about 0.02, not very desirable, testpieces utilizes built-up jig clamping workpiece in producing, namely on the existing flat-nose pliers basis of use, simultaneously at workpiece two ends cushioning cushion block, can prevent because two ends are unsettled in workpiece process, out-of-date workpiece walked by emery wheel affects by cutting force machining accuracy is reduced, and adopts built-up jig clamping workpiece to prove that precision can be brought up within 0.01 through test of many times;
By shapingly for one grinding of former technique being refined as half fine grinding, fine grinding is shaping, under the prerequisite of rotating speed constant (1440r/min), fine grinding cutting output is decided to be 0.005mm, reduces grinding deformation, improve grinding accuracy;
Due to grinding work piece employing is white fused alumina emery wheel, and workpiece material is 4Cr13, and in grinding process, technological requirement through conventional diamond tool grinding wheel, must can remove the iron filings be bonded on emery wheel like this; For mill car platform, then before each processing work, plane must be refined, so can to ensure the requirement of initial plane degree;
Improved by above-mentioned foreign side grinding technique, testpieces symmetry all meets drawing requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of honing core shaft before improving.
Fig. 2 is the structural representation of honing core shaft after improving.
Fig. 3 is the stereogram of built-up jig after improving.
Fig. 4 is the structural representation of built-up jig after improving.
In figure, 1 is oilstone, and 2 is mandrel head, and 3 is workpiece, and 4 is the first cushion block, and 5 is the second cushion block, and 6 is built-up jig.
Detailed description of the invention
As Figure 1-Figure 4, the outer square structure method for fine finishing of slender type, thin-walled stepped hole type inner circle, interior hole machined carries out according to following steps:
The first step, perform rough turn operation to foreign round, and strengthen cylindrical surplus 2mm in rough turn operation;
Second step, half finish turning, finish turning, precision grinding process are performed successively to the cylindrical after the first step;
3rd step, perform artificial aging process to the cylindrical after second step, aging temp is 125 degree, and the time is 6 hours;
4th step, use hone Hole honing;
5th step, car mandrel;
6th step, half fine cylindrical;
7th step, fine cylindrical;
Foreign side's processing is carried out according to following steps:
The first step, employing built-up jig clamping workpiece;
Second step, by mandrel location foreign side machining benchmark;
3rd step, Linear cut foreign side;
4th step, perform artificial aging process to the foreign side after the 3rd step, aging temp is 125 degree, and the time is 6 hours;
5th step, partly refine foreign side;
6th step, in advance fine grinding mill car platform plane, then refine foreign side, under the constant prerequisite of rotating speed, cutting output is decided to be 0.005mm, and grinding process constantly uses diamond tool grinding wheel.
Described hone is the standard honing core shaft of topping, and standard honing core shaft end after topping is concordant with bottom oilstone, and described oilstone is the hardhead oilstone higher than common oilstone hardness.
The present invention by changing interior hole machined into honing by traditional articulation, and improves hone, meets inner hole precision requirement, can fundamentally solve because articulation hole cannot arrange the scuffing barrel problem of cutting and causing; By improving positioning datum, improving clamping tooling, selecting best grinding parameter, control grinding deformation, meet foreign side's required precision.Prove through test of many times, adopt the grinding of the present invention internal, outer square set foreign side all to meet technological requirement.
Claims (1)
1. slender type, the outer square structure method for fine finishing of thin-walled stepped hole type inner circle, is characterized in that interior hole machined carries out according to following steps:
The first step, perform rough turn operation to foreign round, and strengthen cylindrical surplus 2mm in rough turn operation;
Second step, half finish turning, finish turning, precision grinding process are performed successively to the cylindrical after the first step;
3rd step, perform artificial aging process to the cylindrical after second step, aging temp is 125 degree, and the time is 6 hours;
4th step, use hone Hole honing;
5th step, car mandrel;
6th step, half fine cylindrical;
7th step, fine cylindrical;
Foreign side's processing is carried out according to following steps:
The first step, employing built-up jig clamping workpiece;
Second step, by mandrel location foreign side machining benchmark;
3rd step, Linear cut foreign side;
4th step, perform artificial aging process to the foreign side after the 3rd step, aging temp is 125 degree, and the time is 6 hours;
5th step, partly refine foreign side;
6th step, in advance fine grinding mill car platform plane, then refine foreign side, under the constant prerequisite of rotating speed, cutting output is decided to be 0.005mm, and grinding process constantly uses diamond tool grinding wheel.
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| CN201510077644.5A CN104690511B (en) | 2015-02-13 | 2015-02-13 | The outer square structure method for fine finishing of slender type, thin-walled stepped hole type inner circle |
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| CN201510077644.5A CN104690511B (en) | 2015-02-13 | 2015-02-13 | The outer square structure method for fine finishing of slender type, thin-walled stepped hole type inner circle |
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| CN104690511A true CN104690511A (en) | 2015-06-10 |
| CN104690511B CN104690511B (en) | 2017-11-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541290A (en) * | 2017-01-23 | 2017-03-29 | 苏州经贸职业技术学院 | A kind of jig of the circumferential registration for thin-wall part processing |
| CN109590821A (en) * | 2018-11-22 | 2019-04-09 | 成都飞机工业（集团）有限责任公司 | A kind of excircle precision grinding method of overlength diameter cutter |
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| CN106541290A (en) * | 2017-01-23 | 2017-03-29 | 苏州经贸职业技术学院 | A kind of jig of the circumferential registration for thin-wall part processing |
| CN109590821A (en) * | 2018-11-22 | 2019-04-09 | 成都飞机工业（集团）有限责任公司 | A kind of excircle precision grinding method of overlength diameter cutter |
| CN109590821B (en) * | 2018-11-22 | 2021-03-30 | 成都飞机工业（集团）有限责任公司 | Excircle precision grinding method of super-long-diameter cutter |
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Address after: No. 6 mailbox of Changzhi City, Shanxi Province, Shanxi Co-patentee after: China Academy of Launch Vehicle Technology Patentee after: Shanxi spaceflight Qinghua Equipment Co., Ltd. Address before: No. 6 mailbox of Changzhi City, Shanxi Province, Shanxi Co-patentee before: China Academy of Launch Vehicle Technology Patentee before: Qinghua Machinery Plant, Changzhi |
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