CN104907616B - A kind of monoblock type hardened steel turning back chipping test specimen and its high-speed milling process - Google Patents
A kind of monoblock type hardened steel turning back chipping test specimen and its high-speed milling process Download PDFInfo
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- CN104907616B CN104907616B CN201510373033.5A CN201510373033A CN104907616B CN 104907616 B CN104907616 B CN 104907616B CN 201510373033 A CN201510373033 A CN 201510373033A CN 104907616 B CN104907616 B CN 104907616B
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- 238000003801 milling Methods 0.000 title claims abstract description 100
- 238000007514 turning Methods 0.000 title claims abstract description 80
- 229910000760 Hardened steel Inorganic materials 0.000 title claims abstract description 66
- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000012876 topography Methods 0.000 claims abstract description 64
- 238000005520 cutting process Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000003754 machining Methods 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 238000002474 experimental method Methods 0.000 claims description 15
- 210000003141 lower extremity Anatomy 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000004439 roughness measurement Methods 0.000 claims description 5
- 241000220317 Rosa Species 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 241000357293 Leptobrama muelleri Species 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 208000012868 Overgrowth Diseases 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
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Abstract
A kind of monoblock type hardened steel turning back chipping test specimen and its high-speed milling process, are characterized in that：The test specimen includes the base in Milling Process region and its bottom, the top surface in Milling Process region is reclinate top surface concave curved surface in the width direction, top surface concave curved surface is smoothly transitted by 5 sections of curved surfaces for possessing different curvature radius being distributed along its length successively and is formed by connecting, four turnings of top surface concave curved surface are the different arc corners of radius, the side elevation in Milling Process region is provided with one section of side concave curved surface being recessed at the heart thereto, formed below all boss on the side elevation in Milling Process region in side concave curved surface, the surface of all boss are parallel with top surface concave curved surface；Base stretches out to form boss along the both sides in Milling Process peak width direction.The method includes：The selection of step one, machining area：Step 2, design tool cutting path：The process program of milled surface topography when step 3, test high-speed milling hardened steel turning back chipping.
Description
Technical field：
The present invention relates to a kind of high-speed milling hardens, the test specimen and its process design method of steel mold turning back chipping, specifically relates to
And monoblock type hardened steel turning back chipping test specimen and its high-speed milling process.
Background technology：
Using rose cutter cutting of hardened steel die insert turning back chipping when, complicated finished surface Curvature varying is caused
Cutting force and milling cutter vibration play pendulum, and cause milled surface topography deterioration, cutter wear serious, milling cutter service life
Decline with stock-removing efficiency.Frequently changed by Hardened Steel Workpiece curvature and machining inclination angle and milling cutter turning feeding reduction of speed is affected, cut
Power and milling cutter vibration play pendulum；Find simultaneously, rotating speed is too high or too low to make cutting force generation change by a relatively large margin,
Shock loading is caused to be mutated.
Consider turning back chipping effect of radius, in method of the corner radius smaller part using feed speed is reduced, cause milling
Knife cutting is trembled, and finished surface scallop-height is in interior frequent change in a big way, hardened steel turning clean-up machining surface topography pole
Which is uneven, causes machined surface quality significantly to deteriorate.
Existing method directly carries out milling cutter vibration-testing in large-scale steel mold of hardening, and easily causes die face to damage
Wound, affects die life.And in large-scale steel mold of hardening, having multiple turnings and back chipping insert, its radius distribution is different, and
Using the test specimen of the single change of radius carry out Cutting Process that cutting experiment obtained cannot effective control finished surface curvature become
Change the impact to milled surface topography.
The content of the invention：
The invention provides a kind of monoblock type hardened steel turning back chipping test specimen and its high-speed milling process, solve height
The uneven problem of fast milling mould turning clean-up machining surface topography.
The monoblock type hardened steel turning back chipping test specimen of the present invention, the technical scheme for being adopted for achieving the above object is：
The test specimen includes the base in Milling Process region and its bottom, and the top surface in the Milling Process region is downward in the width direction
The top surface concave curved surface of bending, the top surface concave curved surface by 5 sections the be distributed along its length curved surfaces for possessing different curvature radius according to
Secondary smoothly transitting is formed by connecting, and four turnings of top surface concave curved surface are the different arc corners of radius, the side in Milling Process region
Facade is provided with one section of side concave curved surface being recessed at the heart thereto, and side concave curved surface is on the side elevation in Milling Process region
Formed below all boss, the surface of all boss is parallel with top surface concave curved surface, top edge and the top surface concave curved surface of side concave curved surface
Edge intersect, the lower limb of side concave curved surface is intersected with week boss；The base along Milling Process peak width direction two
Epitaxial lateral overgrowth is stretched to form boss, and the length direction on the boss of every side along test specimen is distributed with two U-lags.
Further, the size in the Milling Process region 1 is 100mm × 48mm × 45mm, and the size of the base 2 is
100mm × 73mm × 5mm, the size of the U-lag 8 is 12.5mm × 10mm × 5mm.The size is hardened according to actual milling
Depending on steel mold, so as to the situation of true simulation hardened steel turning back chipping.
Further, reclinate radius of curvature is 200mm to the top surface concave curved surface 3 in the width direction, constitutes top surface
5 sections of curved surfaces of concave curved surface 3 are followed successively by：The dome camber line of length 14mm, radius of curvature 1170mm, length 26mm, radius of curvature
The dome camber line of 66mm, length 20mm, the concave arc line of radius of curvature 1140mm, length 18mm, the recessed circle of radius of curvature 66mm
Camber line, length 12mm, the concave arc line of radius of curvature 1112mm, 5 sections of curved surfaces be sequentially connected after track along its length for just
Chordwise track, is consequently formed the top surface concave curved surface with variable curvature concave curved surface, so as to the institute for embodying hardened steel turning back chipping comprehensively
There is something special.
Further, the height of the side concave curved surface 4 is 14mm, to the radius of 1 center of Milling Process region depression
For 10mm, the intersecting lens of the lower limb of side concave curved surface 4 and all boss 6 is made up of 5 sections of curves, is followed successively by length 19mm, curvature
The dome camber line of radius 1170mm, length 26mm, the dome camber line of radius of curvature 66mm, length 20mm, radius of curvature 1140mm
Concave arc line, length 18mm, the concave arc line of radius of curvature 66mm, length 17mm, the concave arc line of radius of curvature 1112mm,
After 5 sections of curves are sequentially connected, track along its length is sinusoidal pattern track, is consequently formed the side with variable curvature concave curved surface
Concave curved surface, so as to all situations for embodying hardened steel turning back chipping comprehensively.
Further, from the upper left corner, its radius is respectively at four turnings of the top surface concave curved surface 3：R20mm、
R10mm, R15mm, R5mm, this little radius are corner radius common in the back chipping of hardened steel turning.
Further, the test specimen is Cr12MoV forging, and after its quenching, hardness is HRC55-60, and the material and hardness are
The conventional material of steel mold of actually hardening and hardness.
The high-speed milling of the present invention hardens the process of steel mold turning back chipping, and test specimen used is quenched for above-mentioned monoblock type
Hard steel turning back chipping test specimen, is specifically made up of following steps：
The selection of step one, machining area：
It is milling test point that four turnings of side concave curved surface 4 are chosen respectively with the intersection of all boss, radius R20mm's
The milling test point of corner is named as point A, and the milling test point of the corner of radius R5mm is named as point B, radius R15mm's
The milling test point of corner is named as point C, and the milling test point of the corner of radius R10mm is named as point D, and adjacent milling is surveyed
The line segment is linked to be by pilot is that line segment is tested in milling, is named as line segment AB, line segment BC, line segment CD, line segment DA successively；
Step 2, design tool cutting path：
Point B with step one is cut to line segment BC, line segment CD, line segment DA, line segment AB successively as original position；
The process program of milled surface topography when step 3, test high-speed milling hardened steel turning back chipping：
A, hardened steel turning is carried out to point A, point B, point C, point D using speed of mainshaft 8000rpm, feed engagement 0.3mm
Side elevation milled surface topography cutting experiment, and milled surface topography data are extracted, using speed of mainshaft 6000rpm, feeding speed
Degree is respectively 360mm/min, 600mm/min, 780mm/min, 960mm/min, 1320mm/min to line segment AB, line segment BC, line
Section CD, line segment DA carry out hardened steel clean-up machining surface topography cutting experiment, obtain milled surface topography；
B, be respectively adopted speed of mainshaft 3500rpm, feed speed 1000mm/min and speed of mainshaft 6000rpm, feeding speed
Degree 1800mm/min carries out the process certification experiment of high-speed milling hardened steel turning side elevation to point A, point B, point C, point D, and right
Than the milled surface topography of two kinds of high-speed milling hardened steel turning side elevation process programs；
C, the slow-revving back chipping process program of employing drop, are respectively adopted speed of mainshaft 2000rpm, feed speed 1000mm/
Min and speed of mainshaft 6000rpm, feed speed 1320mm/min are hardened to line segment AB, line segment BC, line segment CD, line segment DA
Steel flow cut is tested, and contrasts the milled surface topography of two kinds of high-speed milling hardened steel turning process programs, obtains high-speed milling
The optimum process scheme of hardened steel turning back chipping；
Further, milling cutter is using the indexable high speed bulb milling of two teeth of diameter 20mm for being provided with coated cemented carbide insert
Knife, lathe adopt five-axle number control machine tool MIKRON UCP710, milling cutter Mold processing be 100mm, feed engagement 0.25mm, milling
Width 0.3mm, cutting depth 0.2mm, milling mode is upmilling, this bit for milling harden steel mold turning back chipping when conventional work
Skill condition, really harden steel mold turning back chipping technique to simulate as far as possible.
Further, roughness measurement is carried out to the test specimen finished surface after step 3 cutting, to determine test specimen processing table
The quality in face.
Further, instrument that roughness measurement adopts is carried out for the portable roughmeters of TR200, its accuracy of detection is high.
The invention has the beneficial effects as follows：This invention provides a kind of hardened steel turning back chipping with variable curvature concave curved surface
Test specimen, by the test specimen come the labyrinth of simulated automotive covering hardened steel die face, then by using different cuttings
Parameter obtains the shape of finished surface under the conditions of different radii the experiment of milling hardened steel turning back chipping is carried out to the test specimen
Looks, so that it is determined that the optimum process scheme of high-speed milling hardened steel turning back chipping, the test specimen and method are applied to large-scale hardened steel
Mold high speed milling process is designed, and can meet the highly-efficient processing demand in steel mold turning back chipping type face of hardening.
Description of the drawings：
Fig. 1 is the front view of the monoblock type hardened steel turning back chipping test specimen of the present invention；
Fig. 2 is the top view of the monoblock type hardened steel turning back chipping test specimen of the present invention；
Fig. 3 is the side view of the monoblock type hardened steel turning back chipping test specimen of the present invention；
Fig. 4 is hardened steel turning side elevation finished surface scallop-height figure, in figureRepresent direction of feed surface residual
Highly,Represent line-spacing direction surface residual height；
Fig. 5 is hardened steel turning side elevation milled surface topography experimental result picture；
Fig. 6 is hardened steel clean-up machining surface topography experimental result picture；
Fig. 7 is that speed of mainshaft 3500rpm and speed of mainshaft 6000rpm is respectively adopted to carry out the side elevation cutting of hardened steel turning
Machined surface quality experimental comparison figure；
Fig. 8 is that speed of mainshaft 2000rpm and speed of mainshaft 6000rpm is respectively adopted to carry out the side elevation cutting of hardened steel turning
Machined surface quality experimental comparison figure；
Fig. 9 is the experimental result picture that hardened steel back chipping high-speed milling is carried out using speed of mainshaft 6000rpm.
Specific embodiment：
Referring to figs. 1 to Fig. 3, the monoblock type hardened steel turning back chipping test specimen, including the bottom of Milling Process region 1 and its bottom
Seat 2, the top surface in the Milling Process region 1 is top surface concave curved surface 3 in the width direction for radius of curvature 200mm, the top surface
Concave curved surface 3 is smoothly transitted by 5 sections of curved surfaces for possessing different curvature radius being distributed along its length successively and is formed by connecting, and top surface is recessed
Four turnings of curved surface 3 are the different arc corners 5 of radius, and the side elevation in Milling Process region 1 is provided with one section of heart thereto
The side concave curved surface 4 of place's depression, the formed below all boss 6 on the side elevation in Milling Process region 1 in side concave curved surface 4,
The surface of all boss 6 is parallel with top surface concave curved surface 3, and the top edge of side concave curved surface 4 is intersected with the edge of top surface concave curved surface 3, side
The lower limb of face concave curved surface 4 is intersected with all boss 6；The base 2 stretches out along the both sides of 1 width of Milling Process region
Boss 7 is formed, and the length direction on every side boss 7 along test specimen is distributed with two U-lags 8, test specimen is fixed on by U-lag 8
On lathe.The size in the Milling Process region 1 is 100mm × 48mm × 45mm, the size of the base 2 be 100mm ×
73mm × 5mm, the size of the U-lag 8 is 12.5mm × 10mm × 5mm.5 sections of curved surfaces for constituting top surface concave curved surface 3 according to
It is secondary to be：The dome camber line of length 14mm, radius of curvature 1170mm, length 26mm, the dome camber line of radius of curvature 66mm, length
The concave arc line of 20mm, radius of curvature 1140mm, length 18mm, the concave arc line of radius of curvature 66mm, length 12mm, curvature half
The concave arc line of footpath 1112mm, after 5 sections of curved surfaces are sequentially connected, track along its length is sinusoidal pattern track.The side concave curved
The height in face 4 is 14mm, is 10mm, the lower limb of side concave curved surface 4 and week to the radius of 1 center of Milling Process region depression
The intersecting lens of boss 6 is made up of 5 sections of curves, is followed successively by the dome camber line of length 19mm, radius of curvature 1170mm, length 26mm,
The dome camber line of radius of curvature 66mm, length 20mm, the concave arc line of radius of curvature 1140mm, length 18mm, radius of curvature
The concave arc line of 66mm, length 17mm, the concave arc line of radius of curvature 1112mm, 5 sections of curves be sequentially connected after along its length
Track be sinusoidal pattern track.From the upper left corner, its radius is respectively at four turnings of the top surface concave curved surface 3：R20mm、
R10mm、R15mm、R5mm.The test specimen is Cr12MoV forging, and after its quenching, hardness is HRC55-60.
A kind of high-speed milling hardens the process of steel mold turning back chipping, and test specimen used is above-mentioned monoblock type hardened steel
Turning back chipping test specimen, is specifically made up of following steps：
The selection of step one, machining area：
Reference Fig. 2, it is milling test point to choose four turnings of side concave curved surface 4 respectively with the intersection of all boss, partly
The milling test point of the corner of footpath R20mm is named as point A, and the milling test point of the corner of radius R5mm is named as point B, and half
The milling test point of the corner of footpath R15mm is named as point C, and the milling test point of the corner of radius R10mm is named as point D,
The line segment is linked to be by adjacent milling test point is that line segment is tested in milling, is named as line segment AB, line segment BC, line segment CD, line segment successively
DA；
Step 2, design tool cutting path：
Point B with step one is cut to line segment BC, line segment CD, line segment DA, line segment AB successively as original position；
The process program of milled surface topography when step 3, test high-speed milling hardened steel turning back chipping：
A, hardened steel turning is carried out to point A, point B, point C, point D using speed of mainshaft 8000rpm, feed engagement 0.3mm
Side elevation milled surface topography cutting experiment, obtains hardened steel turning side elevation finished surface scallop-height variation characteristic such as Fig. 4
Shown, acquisition hardened steel turning side elevation milled surface topography experimental result is as shown in table 1, obtains milled surface topography such as Fig. 5
It is shown, wherein figure (a) is the milled surface topography of point A, scheme the milled surface topography that (b) is line segment AB, figure (c) is that point B adds
Work surface topography, schemes the milled surface topography that (d) is line segment BC, schemes the milled surface topography that (e) is point C, and figure (f) is line segment CD
Milled surface topography, scheme (g) be point D milled surface topography, scheme (h) be line segment DA milled surface topography.
1 hardened steel turning side elevation milled surface topography experimental result of table
As a result show, under the conditions of speed of mainshaft 8000rpm, by turning side elevation effect of radius, finished surface is remaining high
, in interior frequent change in a big way, hardened steel turning side elevation milled surface topography is extremely uneven, and finished surface everywhere for degree
There is larger difference in pattern, it is impossible to obtain high-quality finished surface.
Using speed of mainshaft 6000rpm, feed speed be respectively 360mm/min, 600mm/min, 780mm/min,
960mm/min, 1320mm/min carry out hardened steel clean-up machining surface topography to line segment AB, line segment BC, line segment CD, line segment DA and cut
Experiment is cut, and the milled surface topography experimental result in High Speed Milling of Hardened Steels back chipping is obtained as shown in fig. 6, it is point A wherein to scheme (a)
Milled surface topography, scheme (b) be line segment AB milled surface topography, scheme (c) be point B milled surface topography, figure (d) be line
The milled surface topography of section BC, schemes the milled surface topography that (e) is point C, schemes the milled surface topography that (f) is line segment CD, schemes (g)
It is the milled surface topography of point D, schemes the milled surface topography that (h) is line segment DA.
As a result show, under the conditions of speed of mainshaft 6000rpm, it is considered to side elevation corner radius affect, corner radius compared with
Method of the little place using feed speed is reduced, causes milling cutter cutting and trembles, and finished surface scallop-height is in interior frequency in a big way
Numerous change, hardened steel clean-up machining surface topography are extremely uneven, cause machined surface quality significantly to deteriorate.
Experimental result in b, foundation a steps, modification hardened steel turning side elevation experimental program, is respectively adopted the speed of mainshaft
3500rpm, feed speed 1000mm/min and speed of mainshaft 6000rpm, feed speed 1800mm/min to point A, point B, point C,
Point D carries out the process certification experiment of high-speed milling hardened steel turning side elevation, and experimental result is as shown in fig. 7, it is a little wherein to scheme (a)
The milled surface topography of B, schemes the milled surface topography that (b) is point D, schemes the milled surface topography that (c) is point C, and figure (d) is point A
Milled surface topography.
As a result show, under the conditions of identical line-spacing and cutting-in, the side of above two cutting scheme Jun Shi hardened steel corner
Facade milled surface topography be improved significantly, obtain preferable machined surface quality, machined surface roughness up to 0.8 μm-
1.6μm。
Two kinds of cutting schemes of contrast, cut scheme using speed of mainshaft 6000rpm, are improving the same of machined surface quality
When, its stock-removing efficiency improves 80% compared with speed of mainshaft 2000rpm cutting scheme.
C, the slow-revving turning process program of drop commonly used using steel mold of hardening, using speed of mainshaft 2000rpm, feeding
Speed 1000mm/min carries out hardened steel flow cut experiment to line segment AB, line segment BC, line segment CD, line segment DA, and experimental result is such as
Shown in Fig. 8, wherein figure (a) is the milled surface topography of point B, the milled surface topography that (b) is point D is schemed, figure (c) is that point C adds
Work surface topography, schemes the milled surface topography that (d) is point A；
According to above-mentioned analysis and experimental result, using speed of mainshaft 6000rpm, feed speed 1320mm/min to line segment
AB, line segment BC, line segment CD, line segment DA carry out hardened steel flow cut experiment, and experimental result is as shown in figure 9, it is a little wherein to scheme (a)
The milled surface topography of A, schemes the milled surface topography that (b) is line segment AB, schemes the milled surface topography that (c) is point B, and figure (d) is
The milled surface topography of line segment BC, schemes the milled surface topography that (e) is point C, schemes the milled surface topography that (f) is line segment CD, figure
G () is the milled surface topography of point D, scheme the milled surface topography that (h) is line segment DA.
As a result show, the process program is obviously improved corner's clean-up machining surface topography generation, connects tool marks and substantially subtracts
Little, machined surface roughness can reach 1.6 μm or so, and stock-removing efficiency improves 32% compared with speed of mainshaft 2000rpm process program,
So being to carry out high-speed milling hardened steel turning using the process program of speed of mainshaft 6000rpm, feed speed 1320mm/min
The optimum process scheme of back chipping.
Cutting experiment in each step of the above, milling cutter can using two teeth of diameter 20mm for being provided with coated cemented carbide insert
Indexable high speed rose cutter, lathe adopt five-axle number control machine tool MIKRON UCP710, milling cutter Mold processing be 100mm, per tooth feeding
Amount 0.25mm, milling width 0.3mm, cutting depth 0.2mm, milling mode is upmilling.And adopt the portable roughmeters of TR200
Roughness measurement is carried out to the test specimen finished surface in above steps.
Claims (10)
1. a kind of monoblock type hardened steel turning back chipping test specimen, it is characterised in that：The test specimen include Milling Process region (1) and its
The base (2) of bottom, the top surface of the Milling Process region (1) is reclinate top surface concave curved surface (3) in the width direction, institute
State top surface concave curved surface (3) by 5 sections the be distributed along its length curved surfaces for possessing different curvature radius smoothly transit successively connection and
Into four turnings of top surface concave curved surface (3) are the different arc corners (5) of radius, are set on the side elevation of Milling Process region (1)
There is one section of side concave curved surface (4) being recessed at the heart thereto, on the side elevation of Milling Process region (1), be in side concave curved surface
(4) formed below all boss (6), the surface of all boss (6) are parallel with top surface concave curved surface (3), the top of side concave curved surface (4)
Edge is intersected with the edge of top surface concave curved surface (3), and the lower limb of side concave curved surface (4) is intersected with all boss (6)；The base (2)
Stretch out to form boss (7) along the both sides of Milling Process region (1) width, per the length on side boss (7) along test specimen
Directional spreding has two U-lags (8).
2. a kind of monoblock type hardened steel turning back chipping test specimen as claimed in claim 1, it is characterised in that：The Milling Process area
The size in domain (1) is 100mm × 48mm × 45mm, and the size of the base (2) is 100mm × 73mm × 5mm, the U-lag
(8) size is 12.5mm × 10mm × 5mm.
3. a kind of monoblock type hardened steel turning back chipping test specimen as claimed in claim 1, it is characterised in that：The top surface concave curved surface
(3) in the width direction reclinate radius of curvature be 200mm, constitute top surface concave curved surface (3) 5 sections of curved surfaces be followed successively by：Length
The dome camber line of 14mm, radius of curvature 1170mm, length 26mm, the dome camber line of radius of curvature 66mm, length 20mm, curvature half
The concave arc line of footpath 1140mm, length 18mm, the concave arc line of radius of curvature 66mm, length 12mm, radius of curvature 1112mm
Concave arc line, after 5 sections of curved surfaces are sequentially connected, track along its length is sinusoidal pattern track.
4. a kind of monoblock type hardened steel turning back chipping test specimen as claimed in claim 1, it is characterised in that：The side concave curved surface
(4) height be 14mm, to Milling Process region (1) center depression radius be 10mm, the lower limb of side concave curved surface (4)
It is made up of 5 sections of curves with the intersecting lens of all boss (6), is followed successively by the dome camber line of length 19mm, radius of curvature 1170mm, length
The dome camber line of 26mm, radius of curvature 66mm, length 20mm, the concave arc line of radius of curvature 1140mm, length 18mm, curvature half
The concave arc line of footpath 66mm, length 17mm, the concave arc line of radius of curvature 1112mm, 5 sections of curves be sequentially connected after along length side
To track be sinusoidal pattern track.
5. a kind of monoblock type hardened steel turning back chipping test specimen as claimed in claim 1, it is characterised in that：The top surface concave curved surface
(3) from the upper left corner, its radius is respectively at four turnings：R20mm、R10mm、R15mm、R5mm.
6. a kind of monoblock type hardened steel turning back chipping test specimen as claimed in claim 1, it is characterised in that：The test specimen is
Cr12MoV forging, after its quenching, hardness is HRC55-60.
7. a kind of high-speed milling hardens the process of steel mold turning back chipping, and test specimen used is any of claim 1-6
A kind of monoblock type hardened steel turning back chipping test specimen described in one, it is characterised in that be made up of following steps：
The selection of step one, machining area：
Four turnings and the intersection of all boss for choosing side concave curved surface (4) respectively are milling test point, and radius R20mm's turns
Milling test point at angle is named as point A, and the milling test point of the corner of radius R5mm is named as point B, and radius R15mm's turns
Milling test point at angle is named as point C, and the milling test point of the corner of radius R10mm is named as point D, adjacent milling test
The be linked to be line segment of point is that line segment is tested in milling, is named as line segment AB, line segment BC, line segment CD, line segment DA successively；
Step 2, design tool cutting path：
Point B with step one is cut to line segment BC, line segment CD, line segment DA, line segment AB successively as original position；
The process program of milled surface topography when step 3, test high-speed milling hardened steel turning back chipping：
A, using speed of mainshaft 8000rpm, feed engagement 0.3mm to point A, point B, point C, that point D carries out hardened steel turning is edge-on
Face milled surface topography cutting experiment, is obtained milled surface topography, is respectively using speed of mainshaft 6000rpm, feed speed
360mm/min, 600mm/min, 780mm/min, 960mm/min, 1320mm/min are to line segment AB, line segment BC, line segment CD, line segment
DA carries out hardened steel clean-up machining surface topography cutting experiment, obtains milled surface topography；
B, speed of mainshaft 3500rpm, feed speed 1000mm/min and speed of mainshaft 6000rpm, feed speed is respectively adopted
1800mm/min carries out the process certification experiment of high-speed milling hardened steel turning side elevation to point A, point B, point C, point D, and contrasts
The milled surface topography of two kinds of high-speed milling hardened steel turning side elevation process programs；
C, using the slow-revving back chipping process program of drop, be respectively adopted speed of mainshaft 2000rpm, feed speed 1000mm/min and
Speed of mainshaft 6000rpm, feed speed 1320mm/min carry out hardened steel back chipping to line segment AB, line segment BC, line segment CD, line segment DA
Cutting experiment, contrasts the milled surface topography of two kinds of high-speed milling hardened steel turning process programs, obtains high-speed milling hardened steel
The optimum process scheme of turning back chipping.
8. a kind of high-speed milling as claimed in claim 7 hardens the process of steel mold turning back chipping, it is characterised in that：Milling
Knife adopts five-shaft numerical control using the indexable high speed rose cutter of two teeth of diameter 20mm for being provided with coated cemented carbide insert, lathe
Lathe MIKRON UCP710, milling cutter Mold processing be 100mm, feed engagement 0.25mm, milling width 0.3mm, cutting depth
0.2mm, milling mode are upmilling.
9. a kind of high-speed milling as claimed in claim 7 hardens the process of steel mold turning back chipping, it is characterised in that：It is right
Test specimen finished surface after step 3 cutting carries out roughness measurement.
10. a kind of high-speed milling as claimed in claim 9 hardens the process of steel mold turning back chipping, it is characterised in that：
Instrument that roughness measurement adopts is carried out for the portable roughmeters of TR200.
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| CN109048496B (en) * | 2018-09-11 | 2020-04-21 | 湖北三江航天红阳机电有限公司 | Pyramid-shaped part for comprehensive test of five-coordinate machine tool and detection method thereof |
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