CN204736025U - Many hardness concatenation hardened steel concave curved surface test piece - Google Patents
Many hardness concatenation hardened steel concave curved surface test piece Download PDFInfo
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- CN204736025U CN204736025U CN201520459257.3U CN201520459257U CN204736025U CN 204736025 U CN204736025 U CN 204736025U CN 201520459257 U CN201520459257 U CN 201520459257U CN 204736025 U CN204736025 U CN 204736025U
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Abstract
The utility model provides a many hardness concatenation hardened steel concave curved surface test piece, it relates to a milling cutter test piece. The utility model discloses an it is unreasonable in order to solve current car inner panel covering die high speed milling technology design scheme, lead to high -speed bulb milling cutter cutting ability to descend, die profile processingquality can't be satisfied and the problem is required. The utility model discloses a first part, second part, third part, fourth part, the 5th part and the 6th part, the upper surface of first part, second part, third part, fourth part and the 5th part makes up squarely machining region, and the machining region concave curved surface is equipped with " protruding " font recess, a ridged recess and a trapezoidal recess on machining region's the upper surface. The utility model discloses can acquire multiple test result, high speed milling technology design's foundation, cutting effect is better.
Description
Technical field
The utility model relates to a kind of milling cutter test specimen, is specifically related to a kind of many hardness transitional hardened steel concave curved surface test specimen, belongs to die profile processing technique field.
Background technology
Car inner plate covering die profile exists a large amount of depression, groove, corner, the block insert type hardened steel that adopts is spliced more, and its machining region exists the multiple high rigidity surface of vast scale; By the cutting-impact effect that finished surface hardness and Curvature varying cause, milling cutter vibration obviously, directly affects the machined surface quality of die face.
This type of die face overall size is large, finishing step surplus is little, in order to avoid causing damage to die face, directly can not carry out the test of high-speed milling cutter cutting ability on hardened steel die face, vibrational state when high speed rose cutter cuts this type of mould and the impact on machined surface quality thereof cannot be predicted; Existing technique adopts the processing method identical with punch to cut, and its machined surface roughness value, higher than Ra1.6 μm, cannot meet the requirement with punch lapping-in adaptation; Meanwhile, owing to its profile existing a large amount of depression, follow-up repairing grinds difficulty.
Utility model content
The purpose of this utility model directly can not carry out the test of high-speed milling cutter cutting ability on hardened steel die face to solve car inner plate covering die high-speed milling technique, milling process design is unreasonable, cause high speed rose cutter vibrate and machined surface roughness value too high, cannot meet die profile crudy requirement problem.
The technical solution of the utility model is: a kind of many hardness transitional hardened steel concave curved surface test specimen, described test specimen is rectangular structure, long is 400mm, wide is 300mm, comprise the first part, second part, 3rd part, 4th part, 5th part and the 6th part, on the upper surface being arranged on the 6th part that 4th part and the 5th part are parallel up and down, first part, second part and the 3rd part are arranged on by the 4th part along arrangement successively, in the groove that 5th part and the 6th part are formed, described first part, second part, 3rd part, the upper surface of the 4th part and the 5th part is combined into square machining area, described machining area is concave curved surface, the upper surface of machining area is provided with " convex " font groove, a ridged groove and a trapezoidal groove, described 6th part is rectangular structure, 6th part length be greater than the length of machining area, the width of the 6th part is identical with the width of machining area.
Described ridged groove and trapezoidal groove are located in " convex " font groove, and ridged groove and trapezoidal groove are in the T-shaped arrangement coordinated with " convex " font groove, and described trapezoidal groove is short base near ridged groove side, is long base away from ridged groove side.
The bottom surface of described " convex " font groove is plane, the bottom surface of " convex " font groove and the joint of side are round-corner transition rib, the adjacent two sides joint of " convex " font groove is round-corner transition rib, and " convex " font groove bottom profile is less than its upper surface profile.
Cross section and the vertical section of described ridged groove are trapezoidal parallel with bottom in upper base, and the bottom surface of ridged groove and the joint of side are round-corner transition rib.
It is the trapezoidal of arc that the cross section of described trapezoidal groove and vertical section are bottom, and the bottom surface of trapezoidal groove and the joint of side are round-corner transition rib.
The Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number of described 3rd part is greater than the first part is greater than the second part is greater than the 4th part equals the Rockwell hardness number of the 5th part.
Based on the die profile processing technology of described a kind of many hardness transitional hardened steel concave curved surface test specimen, comprise the following steps:
Step one, parallel mill cutting path along described piece lengths 400mm direction marks off the cutting zone of five kinds of finished surface curvature and firmness change, parallel mill cutting path along specimen width 300mm direction marks off the cutting zone of six kinds of finished surface curvature and firmness change, and the milling cutter cutting path along three recessed circumferential marks off the cutting zone of four kinds of finished surface curvature and firmness change;
Step 2, utilizes two identical milling cutters to cut with different rotating speeds and feed speed the cutting zone that described in step one, any cutting path divides respectively, carries out high speed rose cutter cutting force meansurement;
Step 3, obtains the instantaneous cutting lay area of milling cutter, Unit cutting force workpiece hardness influence coefficient according to step 2, sets up the instantaneous cutting Force Model of high speed rose cutter;
Step 4, by automobile internal covering part hardened steel die high-speed milling technological experiment, the technological effect of checking high-speed milling many hardness transitional hardened steel concave curved surface.
Described in step 2, milled surface topography test experiments specifically comprises:
Machined surface area arranges some sampled points, extracts each sampled point along radius of curvature and hardness in milling cutter feeding and milling width, and calculate the milling cutter axis of each sampled point and the machining inclination angle folded by finished surface normal direction and Unit cutting force;
The vibration change of record milling cutter under different milling widths and direction of feed, the change of milling cutter machined surface roughness under different rotating speeds;
Described step 3 specifically comprises:
Utilize the instantaneous cutting lay area of milling cutter and Unit cutting force, solve the instantaneous cutting Force Model of high speed rose cutter;
F
c(θ)＝A
D(θ)·p
c(θ) (1)
In formula: θ is milling cutter contact angle, A
d(θ) be the instantaneous cutting lay area of milling cutter, p
c(θ) be area cutting force, F
c(θ) be the instantaneous cutting force of milling cutter;
The instantaneous average cutting layer thickness of rose cutter, workpiece hardness, cutting speed and the effective cutting diameter of milling cutter is utilized to set up the Unit cutting force model that high speed rose cutter cuts many hardness test specimen;
p
c(θ)＝p
c1.1/h
aV(θ)＝(p
0c1.1+k·HRC)/h
aV(θ) (2)
In formula:: h
aV(θ) be the instantaneous average cutting layer thickness of milling cutter, HRC is finished surface hardness, p
oc1.1for cutting lay unit are cutting force when nominal thickness of cut and width are respectively 1mm; K is workpiece hardness influence coefficient;
Formula (1) and formula (2) is utilized to obtain unit cutting lay area cutting force and workpiece hardness influence coefficient k;
Obtained by experiment: as HRC<50, k=93.75, when HRC >=50, k=107.14;
p
oc1.1＝7982.4·(v/d
f)
-0.21477(3)
In formula: v is cutting speed, d
ffor the effective cutting diameter of milling cutter;
Utilize formula (1) ~ formula (3), set up high-speed milling many hardness transitional hardened steel instantaneous cutting force model:
In formula: u is index, represent h
aVto the influence degree of unit are cutting force;
The utility model compared with prior art has following effect: the utility model provides a kind of method of many hardness transitional hardened steel concave curved surface test specimen with three polygonal grooves and test high-speed milling cutter; Utilize many hardness transitional hardened steel concave curved surface test specimen High Speed Milling Experiment result, the automobile internal covering part hardened steel die high-speed milling new technology of design, although lower than former technique in working (machining) efficiency, but be quantitatively better than original two kinds of techniques respectively at the milling cutter of machined surface quality, consumption, the processing request of car internal covering part hardened steel die can be met.
In the processing of automobile large-scale covering mold integral, multiple hardened steel insert hardness is inconsistent, and there is bigger difference in hardened steel insert and die body hardness, die face hardness in continuous Reciprocated cutting process is caused to be periodic discrete distribution, cutting force load is made to be difficult to control, milling cutter is low for service life, and tool changing is frequent.
Existing hardened steel test specimen does not reflect the polytropy of hardened steel concave curved surface hardness and curvature, cannot disclose milling cutter vibration characteristics, unstable cutting and machined surface quality outstanding problem; Its cutting Force Model does not consider that hardened steel finished surface curvature and hardness frequent variations are on the impact of cutting force load, cannot reflect this type of mold high speed Milling Force variation characteristic.
The method of this test specimen that the utility model provides, test high-speed milling cutter and the instantaneous cutting Force Model of high speed rose cutter, the variation characteristic of milling cutter machining inclination angle, Unit cutting force and milling cutter vibration under many hardness transitional hardened steel concave curved surface curvature and hardness frequent variations condition can be detected, utilize experimental results obviously can distinguish the quality of two kinds of process programs, and the high-speed milling cutter Unit cutting force, vibration amplitude and the machined surface roughness rising degree that improve caused by stock-removing efficiency can be detected, and the change of the milled surface topography caused thus.
Accompanying drawing explanation
Fig. 1, many hardness transitional hardened steel concave curved surface test specimen structural representation, Fig. 1 a is the top view of test specimen, and Fig. 1 b is the sectional view of test specimen along XX line in Fig. 1 a, and Fig. 1 c is the sectional view of test specimen along YY line in Fig. 1 a;
Fig. 2, the milling cutter cutting path schematic diagram of present embodiment;
Fig. 3, present embodiment milling cutter cutting experiment sampled point schematic diagram, the direction of arrow is cutting direction, and in figure, 1 to 6 is sampled point label;
Detailed description of the invention
Accompanying drawings detailed description of the invention of the present utility model, one many hardness transitional hardened steel concave curved surface test specimen of the present utility model is rectangular structure, and overall size 400mm × 300mm × 138mm, as shown in Figure 1, comprises the first part A, second part B, 3rd part C, 4th part D, 5th part E and the 6th part F, described first part A, second part B, 3rd part C, 4th part D is connected with the upper surface of trip bolt with the 6th part F by alignment pin with the lower surface of the 5th part E, on the upper surface being arranged on the 6th part F that 4th part D and the 5th part E are parallel up and down, described 4th part D is identical with the length of the 5th part E, the first part A, second part B and the 3rd part C are arranged on by the 4th part D along arrangement successively, in the groove that 5th part E and the 6th part F is formed, the first part A, second part B is identical with width with the length of the 3rd part C, the first part A, width and the length equaling the 4th part D or the 5th part E of the second part B and the 3rd part C, described first part A, second part B, 3rd part C, the upper surface of the 4th part D and the 5th part E is combined into the high-rate wireless LAN region of 300mm × 300mm × 56mm, and be positioned at the middle part in piece lengths 400mm direction, the smooth concave curved surface of described machining area, it is 800mm along specimen width 300mm directional curvature radius, 200mm, 800mm distributes, and its radius of curvature along piece lengths 400mm direction is 1000mm, 200mm, 1000mm distributes,
The upper surface of machining area is provided with " convex " font groove, a ridged groove and a trapezoidal groove, described 6th part F is rectangular structure, the width of the 6th part F is identical with the width of machining area, the length of the 6th part F is greater than the length of machining area, each same space that 6th part F is reserved along both sides, length 400mm direction, is connected with platen for test specimen, fixes;
Along specimen width 300mm direction, the two ends of the first part A, the second part B, the 3rd part C are connected with the 4th part D, the 5th part E side respectively;
Along piece lengths 400mm direction, the both sides of the second part B are connected with the side of the first part A, the 3rd part C respectively, and with the 4th part D, the 5th part E justify align;
Described ridged groove and trapezoidal groove are located on " convex " font groove bottom surface, and ridged groove and trapezoidal groove are in the T-shaped distribution coordinated with " convex " font groove, and described trapezoidal groove is short base near ridged groove side, is long base away from ridged groove side.
Described " convex " font groove bottom surface is plane, the bottom surface of " convex " font groove and the joint of side are round-corner transition rib, the adjacent two sides joint of " convex " font groove is round-corner transition rib, " convex " font groove bottom profile is less than its upper surface profile, the profile of " convex " font groove of present embodiment is overall size is 250mm × 160mm × 15mm, dark 15mm, across the first part A, second part B, 3rd part C, its edge is 20mm by straight line and radius, the circular sliding slopes of 30mm and 200mm forms, acute angle between surrounding side elevation and vertical plane is 3 ° of gradients, its bottom surface and side radius 3mm,
Cross section and the vertical section of described ridged groove are trapezoidal parallel with bottom in upper base, the end face of ridged groove and the joint of side are round-corner transition rib, the ridged groove height 30mm ridged groove of present embodiment, across the first part A, the second part B, the 3rd part C, long 235mm, bottom width 10mm, top width 50mm; It is 3 ° of gradients along piece lengths direction both end sides facade, and it is 10 ° of gradients along specimen width direction two side elevation, and its bottom surface is plane, with side radius 3mm;
It is the trapezoidal of arc that the cross section of described trapezoidal groove and vertical section are base, the end face of trapezoidal groove and the joint of side are round-corner transition rib, the dark 25mm of trapezoidal groove of present embodiment, bottom width 45mm, top width 70mm, be positioned at the second part B mid portion, be 3 ° of gradients along two sides, specimen width direction, be 10 ° of gradients along two sides, piece lengths direction, groove floor is plane, with side radius 3mm;
The Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number of described 3rd part C is greater than the first part A is greater than the second part B is greater than the 4th part D equals the Rockwell hardness number of the 5th part E.
Material and the stiffness characteristics of the test specimen component part of present embodiment are:
The material of this test specimen component part and stiffness characteristics are:
The material of the first part A adopts Cr12MoV forging, and after quenching, hardness is HRC50 ~ 55;
The material of the second part B adopts Cr12MoV forging, and after quenching, hardness is HRC40 ~ 45;
The material of the 3rd part C adopts Cr12MoV forging, and after quenching, hardness is HRC60 ~ 65;
The material of the 4th part D and the 5th part E adopts Cr12MoV forging, and after quenching, hardness is HRC30 ~ 35;
The material of the 6th part F adopts 45# steel, modifier treatment;
Based on the die profile processing technology of described a kind of many hardness transitional hardened steel concave curved surface test specimen, comprise the following steps: step one, parallel mill cutting path along described piece lengths 400mm direction marks off the cutting zone of five kinds of finished surface curvature and firmness change, parallel mill cutting path along specimen width 300mm direction marks off the cutting zone of six kinds of finished surface curvature and firmness change, milling cutter cutting path along three recessed circumferential marks off the cutting zone of four kinds of finished surface curvature and firmness change, specifically as shown in table 1;
Table 1 hardened steel die test specimen finished surface curvature and stiffness characteristics distribute
Step 2, adopt the indexable high speed rose cutter of two teeth of two identical diameter 20mm being provided with coated cemented carbide insert, Mold processing 90mm, on five-axle number control machine tool UCP710, adopt the milling mode that parallel mill cutting path and suitable upmilling along piece lengths 400mm direction replace, cut scheme with two shown in table 2 kind, carry out the vibration of cutting of hardened steel die sinking cutter and machined surface roughness test experiments;
Table 2 cutting parameter scheme
Adopt the parallel mill cutting path along piece lengths 400mm direction, and milling cutter vibration with machined surface roughness sampled point as shown in Figure 2 and Figure 3;
Extract finished surface each sampled point along radius of curvature, the hardness in milling cutter feeding and milling width, and carry out cutter spindle line and the machining inclination angle folded by finished surface normal direction and Unit cutting force and calculate, result is as shown in table 3;
Table 3 sampled point machining feature and Unit cutting force
Step 3, obtains the instantaneous cutting lay area of milling cutter, Unit cutting force workpiece hardness influence coefficient according to step 2, sets up the instantaneous cutting Force Model of high speed rose cutter;
1, for many hardness transitional hardened steel finished surface curvature and hardness frequent variations, utilize the instantaneous cutting lay area of milling cutter and Unit cutting force, solve the instantaneous cutting Force Model of high speed rose cutter;
F
c(θ)＝A
D(θ)·p
c(θ) (1)
In formula: θ is milling cutter contact angle, A
d(θ) be the instantaneous cutting lay area of milling cutter, p
c(θ) be area cutting force; F
c(θ) be the instantaneous cutting force of milling cutter;
2, utilize finished surface curvature on the impact of the instantaneous average cutting layer thickness of rose cutter, and the effective cutting diameter of workpiece hardness, cutting speed and milling cutter is to unit cutting lay area 1 × 1mm
2the impact of cutting force, sets up the Unit cutting force model that high speed rose cutter cuts many hardness test specimen;
p
c(θ)＝p
c1.1/h
aV(θ)＝(p
0c1.1+k·HRC)/h
aV(θ) (2)
In formula: h
aV(θ) be the instantaneous average cutting layer thickness of milling cutter, HRC is finished surface hardness, p
oc1.1for cutting lay unit are cutting force when nominal thickness of cut and width are respectively 1mm; K is workpiece hardness influence coefficient;
3, adopt table 2 and Fig. 3 experimental program, carry out cutting force experiment, utilize formula (1) and formula (2) to obtain unit cutting lay area 1 × 1mm
2cutting force and workpiece hardness influence coefficient k; As HRC<50, k=93.75, when HRC>=50, k=107.14;
p
oc1.1＝7982.4·(v/d
f)
-0.21477(3)
In formula: v is cutting speed, d
ffor the effective cutting diameter of milling cutter;
(4) utilize formula (1) ~ formula (3), set up high-speed milling many hardness transitional hardened steel instantaneous cutting force model;
The milling cutter vibration adopting the cutting scheme of table 2 to obtain and machined surface roughness experimental result, as shown in table 4 and table 5;
Table 4 milling cutter vibration experiment test result
Table 5 machined surface roughness experimental results
By table 3, table 4 and table 5, by the impact of finished surface curvature and hardness frequent variations, adopt any kind in above-mentioned two kinds of cutting schemes a kind of cutting scheme, cut many hardness transitional hardened steel concave curved surface test specimen, milling cutter machining inclination angle, Unit cutting force and milling cutter vibration amplitude are all in constantly change; Although machined surface roughness change also infrequently, the milled surface topography at identical cutting scheme different measuring points place is obviously different;
Compared with the cutting scheme of speed of mainshaft 2000rpm, feed speed 2200mm/min, adopt the cutting scheme of speed of mainshaft 2200rpm, feed speed 1800mm/min, its Unit cutting force and milling cutter vibration amplitude obviously decline, although stock-removing efficiency have dropped 18%, its machined surface roughness value reduces by one times;
This result shows, adopt the method for this test specimen and test high-speed milling cutter, the variation characteristic of milling cutter machining inclination angle, Unit cutting force and milling cutter vibration under many hardness transitional hardened steel concave curved surface curvature and hardness frequent variations condition can be detected, utilize experimental results obviously can distinguish the quality of two kinds of process programs, and the high-speed milling cutter Unit cutting force, vibration amplitude and the machined surface roughness rising degree that improve caused by stock-removing efficiency can be detected, and the change of the milled surface topography caused thus.
Step 4, adopts automobile internal covering part hardened steel die, carries out the process certification experiment of high-speed milling hardened steel; Experiment condition and experimental result as shown in table 6;
In table 6, new technology is for adopting many hardness transitional hardened steel concave curved surface test specimen and process program thereof, the automobile internal covering part hardened steel die high-speed milling technique obtained by High Speed Milling Experiment;
Although new technology is lower than former technique 1 and former technique 2 in working (machining) efficiency, former technique 1 cannot meet die-face design requirement due to its machined surface quality, need increase by one finishing step; The milling cutter quantity that former technique 2 not only consumes is many, and need repair on type polishing process the increase time at follow-up mould; Above-mentioned two kinds of techniques all do not reach the processing request of automobile internal covering part hardened steel die;
This experimental result proves what many hardness transitional test specimen experimental result reflected further, in hardened steel die high-rate wireless LAN, there is the mutual restriction problem between working (machining) efficiency and machined surface quality.
Experimental result shows, according to many hardness transitional hardened steel concave curved surface test specimen High Speed Milling Experiment result, the automobile internal covering part hardened steel die high-speed milling new technology of design, although lower than former technique in working (machining) efficiency, but be quantitatively better than original two kinds of techniques respectively at the milling cutter of machined surface quality, consumption, the processing request of car internal covering part hardened steel die can be met.
Table 6 automobile internal covering part die fine finishining experimental result and new and old process ration
Cutting parameter and experimental result
Claims (6)
1. the concave curved surface of hardness transitional hardened steel more than kind test specimen, it is characterized in that: comprise the first part, second part, 3rd part, 4th part, 5th part and the 6th part, on the upper surface being arranged on the 6th part that 4th part and the 5th part are parallel up and down, first part, second part and the 3rd part are arranged on by the 4th part along arrangement successively, in the groove that 5th part and the 6th part are formed, described first part, second part, 3rd part, the upper surface of the 4th part and the 5th part is combined into square machining area, described machining area is concave curved surface, the upper surface of machining area is provided with " convex " font groove, a ridged groove and a trapezoidal groove, described 6th part is rectangular structure, 6th part length be greater than the length of machining area, the width of the 6th part is identical with the width of machining area.
2. a kind of many hardness transitional hardened steel concave curved surface test specimen according to claim 1, it is characterized in that: described ridged groove and trapezoidal groove are located in " convex " font groove, ridged groove and trapezoidal groove are in the T-shaped arrangement coordinated with " convex " font groove, described trapezoidal groove is short base near ridged groove side, is long base away from ridged groove side.
3. a kind of many hardness transitional hardened steel concave curved surface test specimen according to claim 1 or claim 2, it is characterized in that: the bottom surface of described " convex " font groove is plane, the bottom surface of " convex " font groove and the joint of side are the excessive rib of fillet, the adjacent two sides joint of " convex " font groove is the excessive rib of fillet, and " convex " font groove bottom profile is less than its upper surface profile.
4. a kind of many hardness transitional hardened steel concave curved surface test specimen according to claim 1 or claim 2, it is characterized in that: cross section and the vertical section of described ridged groove are trapezoidal parallel with bottom in upper base, and the bottom surface of ridged groove and the joint of side are the excessive rib of fillet.
5. a kind of many hardness transitional hardened steel concave curved surface test specimen according to claim 1 or claim 2, it is characterized in that: it is the trapezoidal of arc that the cross section of described trapezoidal groove and vertical section are bottom, the bottom surface of trapezoidal groove and the joint of side are the excessive rib of fillet.
6. a kind of many hardness transitional hardened steel concave curved surface test specimen according to claim 1, is characterized in that: the Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number that the Rockwell hardness number of described 3rd part is greater than the first part is greater than the second part is greater than the 4th part equals the Rockwell hardness number of the 5th part.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907890A (en) * | 2015-06-30 | 2015-09-16 | 哈尔滨理工大学 | Stitching quenched steel concave-curve-surface test piece having multiple hardnesses and machining technology of die molded surface |
-
2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907890A (en) * | 2015-06-30 | 2015-09-16 | 哈尔滨理工大学 | Stitching quenched steel concave-curve-surface test piece having multiple hardnesses and machining technology of die molded surface |
| CN104907890B (en) * | 2015-06-30 | 2017-03-29 | 哈尔滨理工大学 | A kind of many hardness transitional hardened steel concave curved surface test specimens and die type face processing technology |
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