CN105880350A - Discontinuous point type blank holder for fine blanking die and design method of technological parameters of discontinuous point type blank holder - Google Patents
Discontinuous point type blank holder for fine blanking die and design method of technological parameters of discontinuous point type blank holder Download PDFInfo
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- 238000013461 design Methods 0.000 title claims abstract description 13
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/04—Centering the work; Positioning the tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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Abstract
The invention discloses a discontinuous point type blank holder for a fine blanking die and a design method of technological parameters of the discontinuous point type blank holder. The blank holder comprises a point type blank holder body, wherein a group of raised points are uniformly distributed on the lower surface of the point type blank holder body along the shape contour of a part required to be formed through fine blanking; rounded corners are arranged on the raised points; when the thickness of the part required to be formed through fine blanking is smaller than 5 mm, the point type blank holder is single-sided, and the technological parameters are determined; and when the thickness of the part required to be formed through fine blanking is larger than or equal to 5 mm, a group of raised points which have the same parameters with the raised points on the point type blank holder body are arranged on the upper surface of the fine blanking die, and the technological parameters are determined. According to the design method, aimed at fine blanking parts with different thicknesses, the technological parameters of the discontinuous point type blank holder can be effectively determined, the discontinuous point type blank holder can be widely applied to fine blanking, the cost of the fine blanking die is reduced, and the perfectness ratio of the surfaces of the parts is increased.
Description
Technical field
Present invention relates particularly to a kind of fine blanking die discontinuous point type blank holder and parameters design method thereof.
Background technology
Fine is a kind of high-quality, efficient, the forming technique of low consumption, has been widely used in industry, fine-blanking die
Structure, compared with common stamping mould structure, adds blank holder and counter, and has less clearance between punch and die.Stamping-out mistake
Cheng Zhong, blank holder first compresses material, and then under punch while pressure, counter provides counter-pressure, so that the gold of shear zone
Genus is in the state of three-dimensional Steady-State security and carries out stamping-out, obtains the blanking part that surface quality is good.
Blank holder is an indispensable building block in fine blanking die, and the material beyond shear zone can be stoped in punching
Flow with punch during sanction, the Steady-State security suffered by material can be increased simultaneously, improve the plastic deformation ability of material, enter
And improve the cross section quality of part.The blank holder being most widely used at present is V-arrangement blank holder, and its main machining method is electricity fire
Flower processing or numerical control milling shape, and no matter use which kind of processing method, and the processing of its V-arrangement stalk is relatively difficult, need to use height
The CNC milling machine of precision is processed, and so can increase processing cost, and machining accuracy is difficult to ensure that.
The proposition of discontinuous point type blank holder can reduce fine blanking die cost, discontinuous point type flanging to a certain extent
The processing of circle is easier, simpler than V-arrangement blank holder in the processing of electrical spark working its tool-electrode in man-hour, it is only necessary to utilize drill bit
Bore a series of hole according to salient point arrangement mode designed on blank holder, processing cost can be reduced.But fine is not
During with part, the parameter of discontinuous point type blank holder this how to choose the definition of the system of there is presently no.
Summary of the invention
It is an object of the invention to provide a kind of fine blanking die discontinuous point type blank holder and parameters design method thereof,
It can determine institute's rounding angle square cun, point on the spot diameter of discontinuous point type blank holder, point when the part of stamping-out different-thickness
And the technological parameters such as the height of distance between point edge, the size of some distance die point and point this how to choose, can make
Discontinuous point type blank holder is more efficiently to be applied in fine, thus reduces fine blanking die cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of fine blanking die discontinuous point type blank holder, this blank holder includes point type blank holder body, described point type flanging
Along the uniform one group of raised points of part outline of required fine-punching formation on the lower surface of circle body, in each described raised points
Being provided with rounding, when the thickness of the part of required fine-punching formation is less than 5mm, described point type blank holder is one side, adjacent protrusion
Distance between point edge is 0.4～0.5mm, rounding size in the diameter of described raised points, raised points, the raised points center of circle with
The ratio of distance between blank holder inner ring, the height of raised points and part thickness is respectively 0.3～0.4,0.1～0.15,
0.75～0.85,0.2～0.3；When the thickness of the part of required fine-punching formation is more than or equal to 5mm, at fine blanking die die
Upper surface is provided with the one group raised points identical with described point type blank holder body epirelief origin parameters, adjacent protrusion point edge it
Between distance be 0.4～0.5mm, rounding size in the diameter of described raised points, raised points, the raised points center of circle with in blank holder
The ratio of distance between circle, the height of raised points and part thickness be respectively 0.3～0.4,0.1～0.5,0.75～0.85,
0.15～0.25.
By technique scheme, when the thickness of the part of required fine-punching formation is less than 5mm, between adjacent protrusion point edge
Distance be 0.45mm, in the diameter of described raised points, raised points between rounding size, the raised points center of circle and blank holder inner ring
Distance, the height of raised points and the ratio of part thickness be respectively 0.35,0.125,0.8,0.25.
By technique scheme, when the thickness of the part of required fine-punching formation is more than or equal to 5mm, adjacent protrusion point edge
Between distance be 0.45mm, rounding size in the diameter of described raised points, raised points, the raised points center of circle and blank holder inner ring
Between distance, the height of raised points and the ratio of part thickness be respectively 0.35,0.125,0.8,0.18.
The method for designing of a kind of fine blanking die discontinuous point type blank holder technological parameter, comprises the following steps:
S1, when the thickness of part of required fine-punching formation is less than 5mm, use one side discontinuous point type blank holder, i.e. only
Along the uniform one group of raised points of part outline of required fine-punching formation on the lower surface of point type blank holder body, to be optimized
Technological parameter include rounding size, raised points in the distance between adjacent protrusion point edge, the diameter of raised points, raised points
Distance between the center of circle and blank holder inner ring and the height of raised points:
The optimization of the distance between S101, adjacent protrusion point edge: its Optimality Criteria is in the feelings not affecting difficulty of processing
Under condition, improve the cross section quality of stamping；In the FEM (finite element) model of fine blanking die, for different part thickness, from 0～
1mm, interval 0.05mm change the distance on blank holder between adjacent protrusion point edge, observe the cross section quality of stamping, when
When distance between adjacent protrusion point edge is positioned at 0.4～0.5mm, the cross section quality of stamping is good, blank holder difficulty of processing
Low, therefore the distance between adjacent protrusion point edge is 0.4～0.5mm；
Distance between rounding size, the raised points center of circle and blank holder inner ring in S102, the diameter of raised points, raised points
And the optimization of the height of raised points: on the basis of the value of the parameters of the V-arrangement blank holder of corresponding different part thickness, often
Individual optimizing factors all carries out value near the parameter of V-arrangement blank holder, by each optimizing factors and adjacent protrusion point edge it
Between the span of distance be divided into 5 levels, the orthogonal test table of design five factors and five levels, determine test number (TN) 25 times, real
Execute orthogonal test scheme, measure the surface serviceability rate of part obtained by each group of simulation test, by range analysis method to 25
Group data process, and obtain each technological parameter affecting laws to stamping-out piece surface serviceability rate, phase in integrating step S101
The value requirement of the distance between adjacent raised points edge, obtains theoretical best parameter group, analyzes each theoretical best parameter group
Understand with the relation of part thickness of slab, rounding size in the diameter of raised points, raised points, the raised points center of circle and blank holder inner ring it
Between distance, the height of raised points and the ratio of part thickness be respectively 0.3～0.4,0.1～0.15,0.75～0.85,0.2
～0.3；
S2, when required fine-punching formation part thickness more than or equal to 5mm time, use two-sided discontinuous point type blank holder,
I.e. on the lower surface of point type blank holder body and the upper surface of fine blanking die die is each along the part of required fine-punching formation
Appearance profile uniform one group of raised points, technological parameter to be optimized includes the distance between adjacent protrusion point edge, raised points
Distance between rounding size, the raised points center of circle and blank holder inner ring and the height of raised points in diameter, raised points:
The optimization of the distance between S201, adjacent protrusion point edge: repeat step S101, between adjacent protrusion point edge
Distance is 0.4～0.5mm；
Distance between rounding size, the raised points center of circle and blank holder inner ring in S202, the diameter of raised points, raised points
And the optimization of the height of raised points: repeat step S102, rounding size, protruding null circle in the diameter of raised points, raised points
The ratio of distance between the heart and blank holder inner ring, the height of raised points and part thickness is respectively 0.3～0.4,0.1～0.5,
0.75～0.85,0.15～0.25.
The beneficial effect comprise that: be dispersed with along part outline on the point type blank holder that the present invention provides
A series of raised points, compresses plate by raised points, to stop the material beyond shear zone with punch in blanking process
Flowing, meanwhile, discontinuous point type blank holder also increases the Steady-State security suffered by material, improves the plastic deformation ability of material
Power, thus improve the cross section quality of stamping.Affect the technique ginseng that discontinuous point type blank holder acts on during fine
Number has five, the present invention is directed to the fine part of different thickness of slab, it is possible to effectively determine the technological parameter of discontinuous point type blank holder,
Discontinuous point type blank holder can be widely used in fine, reduce fine blanking die cost, improve piece surface serviceability rate.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the front view of the embodiment of the present invention；
Fig. 2 is the top view of the embodiment of the present invention；
Fig. 3 is the graphics of the embodiment of the present invention；
Fig. 4 is the structural representation of the fine blanking die using the present invention；
Fig. 5 is the part using the fine blanking die fine of the present invention to obtain.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
As shown in Figure 1-Figure 3, a kind of fine blanking die discontinuous point type blank holder, this blank holder includes that point type blank holder is originally
Body, along the uniform one group of raised points of part outline of required fine-punching formation on the lower surface of point type blank holder body, each
Raised points is provided with rounding, and when the thickness of the part of required fine-punching formation is less than 5mm, point type blank holder is one side, adjacent
Distance between raised points edge b is 0.4～0.5mm, rounding size r, raised points in diameter of phi d of raised points, raised points
The ratio of distance a between the center of circle and blank holder inner ring, the height h of raised points and part thickness be respectively 0.3～0.4,0.1～
0.15,0.75～0.85,0.2～0.3；When the thickness of the part of required fine-punching formation is more than or equal to 5mm, recessed at fine blanking die
The upper surface of mould is provided with the one group raised points identical with point type blank holder body epirelief origin parameters, adjacent protrusion point edge it
Between distance b be 0.4～0.5mm, rounding size r, the raised points center of circle and blank holder in diameter of phi d of raised points, raised points
The ratio of distance a between inner ring, the height h of raised points and part thickness be respectively 0.3～0.4,0.1～0.5,0.75～
0.85,0.15～0.25.
In a preferred embodiment of the invention, when the thickness of the part of required fine-punching formation is less than 5mm, adjacent protrusion point
Distance between edge is 0.45mm, rounding size, the raised points center of circle and blank holder inner ring in the diameter of raised points, raised points
Between distance, the height of raised points and the ratio of part thickness be respectively 0.35,0.125,0.8,0.25.
In a preferred embodiment of the invention, when the thickness of the part of required fine-punching formation is more than or equal to 5mm, adjacent convex
The distance risen between point edge is 0.45mm, rounding size, the raised points center of circle and blank holder in the diameter of raised points, raised points
Distance, the height of raised points between inner ring are respectively 0.35,0.125,0.8,0.18 with the ratio of part thickness.
The method for designing of a kind of fine blanking die discontinuous point type blank holder technological parameter, comprises the following steps:
S1, when the thickness of part of required fine-punching formation is less than 5mm, use one side discontinuous point type blank holder, i.e. only
Along the uniform one group of raised points of part outline of required fine-punching formation on the lower surface of point type blank holder body, to be optimized
Technological parameter include rounding size, raised points in the distance between adjacent protrusion point edge, the diameter of raised points, raised points
Distance between the center of circle and blank holder inner ring and the height of raised points:
The optimization of the distance between S101, adjacent protrusion point edge: its Optimality Criteria is in the feelings not affecting difficulty of processing
Under condition, improve the cross section quality of stamping；In the FEM (finite element) model of fine blanking die, for different part thickness, from 0～
1mm, interval 0.05mm change the distance on blank holder between adjacent protrusion point edge, observe the cross section quality of stamping, when
When distance between adjacent protrusion point edge is positioned at 0.4～0.5mm, the cross section quality of stamping is good, blank holder difficulty of processing
Low, therefore the distance between adjacent protrusion point edge is 0.4～0.5mm；
Distance between rounding size, the raised points center of circle and blank holder inner ring in S102, the diameter of raised points, raised points
And the optimization of the height of raised points: on the basis of the value of the parameters of the V-arrangement blank holder of corresponding different part thickness, often
Individual optimizing factors all carries out value near the parameter of V-arrangement blank holder, by each optimizing factors and adjacent protrusion point edge it
Between the span of distance be divided into 5 levels, the orthogonal test table of design five factors and five levels, determine test number (TN) 25 times, real
Execute orthogonal test scheme, measure the surface serviceability rate of part obtained by each group of simulation test, by range analysis method to 25
Group data process, and obtain each technological parameter affecting laws to stamping-out piece surface serviceability rate, phase in integrating step S101
The value requirement of the distance between adjacent raised points edge, obtains theoretical best parameter group, analyzes each theoretical best parameter group
Understand with the relation of part thickness of slab, rounding size in the diameter of raised points, raised points, the raised points center of circle and blank holder inner ring it
Between distance, the height of raised points and the ratio of part thickness be respectively 0.3～0.4,0.1～0.15,0.75～0.85,0.2
～0.3；
S2, when required fine-punching formation part thickness more than or equal to 5mm time, use two-sided discontinuous point type blank holder,
I.e. on the lower surface of point type blank holder body and the upper surface of fine blanking die die is each along the part of required fine-punching formation
Appearance profile uniform one group of raised points, technological parameter to be optimized includes the distance between adjacent protrusion point edge, raised points
Distance between rounding size, the raised points center of circle and blank holder inner ring and the height of raised points in diameter, raised points:
The optimization of the distance between S201, adjacent protrusion point edge: repeat step S101, between adjacent protrusion point edge
Distance is 0.4～0.5mm；
Distance between rounding size, the raised points center of circle and blank holder inner ring in S202, the diameter of raised points, raised points
And the optimization of the height of raised points: repeat step S102, rounding size, protruding null circle in the diameter of raised points, raised points
The ratio of distance between the heart and blank holder inner ring, the height of raised points and part thickness is respectively 0.3～0.4,0.1～0.5,
0.75～0.85,0.15～0.25.
The specific design method of the present invention, comprises the following steps:
S1, when stamping thickness than relatively thin (less than 5mm) time, use one side discontinuous point type blank holder, impact ginseng
Number mainly have rounding size in distance between adjacent protrusion point edge, the diameter of raised points, raised points, the raised points center of circle with
Distance between blank holder inner ring and the height of raised points；
S101, first the technological parameter of the discontinuous point type blank holder of the part of stamping-out thickness of slab 4mm is studied, because mesh
The most universal blank holder of front application is V-arrangement blank holder, and the technological parameter of V-arrangement blank holder mainly has blank holder height, blank holder
Position and V-arrangement stalk angle, the usual value of angle of V-arrangement stalk is 450, and choosing of other technological parameters is relevant with thickness of slab, and 4mm is
The critical thickness of slab value that V-arrangement blank holder is chosen, when the thickness of slab of stamping is less than 4mm, uses one side V-arrangement blank holder to carry out stamping-out
Just can obtain the preferable part of surface quality, when the thickness of slab of stamping is more than or equal to 4mm, use two-sided V-arrangement blank holder to enter
Row stamping-out just can obtain the preferable part of surface quality；
The optimization of the distance between S102, one side discontinuous point type blank holder adjacent protrusion point edge: research starting stage
The thickness of slab value of selected part is 4mm, and when the thickness of slab of stamping is 4mm, the height obtaining V-arrangement blank holder according to standard is
0.9mm, the size of V-arrangement blank holder distance die point is 3.2mm, changes the phase of point type blank holder in Deform-3D software
Distance between adjacent raised points edge, span is 0～1mm, and one side discontinuous point type other technological parameters of blank holder are with V
The value of shape blank holder is that standard is chosen, and the diameter of raised points takes 1.4mm, and the height of raised points takes 0.9mm, the raised points center of circle
And the distance between blank holder inner ring takes 3.2mm, in raised points, rounding size takes 0.4mm, after simulation terminates, observes stamping-out zero
The surface quality of part, finds that the distance between adjacent protrusion point edge is the least, stamping under the effect of point type blank holder
Cross section quality is the best, but meanwhile, the difficulty of processing of point type blank holder is the biggest, and it was found that between adjacent protrusion point edge
Distance less than this scope of 0.4mm～0.5mm time, then reduce the distance between adjacent protrusion point edge to fine blanking part surface
The raising impact of quality is not very big, can increase the difficulty of processing of blank holder on the contrary, so considering blank holder to stamping-out zero
Part quality and the impact of difficulty of processing, choose the spacing of optimal point and point edge, and span is 0.4mm～0.5mm,
When carrying out other thin plates of stamping-out by the value of this scope, it was demonstrated that this value is also equally possible, considers blank holder pair
Stamping quality and the impact of difficulty of processing, choose the distance between optimal adjacent protrusion point edge, i.e. 0.45mm；
S103, to the part that stamping-out thickness of slab is 4mm time, each technological parameter raised points of one side discontinuous point type blank holder
Diameter, in raised points between distance, the raised points center of circle and blank holder inner ring between rounding size, adjacent protrusion point edge
Distance and the height of raised points be optimized design, under study for action, the value of these technological parameters is all variate, with V-arrangement
On the basis of the value of blank holder, carrying out value near the parameter of V-arrangement blank holder, selected parameter is as shown in table 1 with level；
Table 1 one side discontinuous point type blank holder technological parameter and level
S104, this be the test problem of 5 factor 5 levels, if to do comprehensive experimental study, it is necessary to will be ground
Each level of each factor of the discontinuous point type blank holder studied carefully is comprehensively arranged in pairs or groups analysis, it is necessary to carry out 55=3125 times
Test, the number of times of so test is too much, is extremely difficult to such requirement, so selecting orthogonal examination under study for action in practical study
Test the technological parameter to discontinuous point type blank holder be analyzed research, it is possible to reduce test number (TN), due to this be one 5 because of
The test of element 5 levels, so the orthogonal table chosen is L25(56), wherein 25 expressions to carry out 25 simulation tests, largely
On decrease test number (TN), 5 represent 5 levels, and 6 represent 6 factors, and have inside 6 factors that 5 factors represent is non-continuity point
5 technological parameters of formula blank holder, also one is used to calculate error, is formed non-by each combination in orthogonal test
Point type blank holder technological parameter imports to be simulated in software continuously, measures the surface serviceability rate obtained by each group of test, as
Shown in table 2；
Table 2 orthogonal test analog result
| Tested number | Surface serviceability rate |
| 1 | 0.87634 |
| 2 | 0.88296 |
| 3 | 0.89728 |
| 4 | 0.88750 |
| 5 | 0.87241 |
| 6 | 0.90308 |
| 7 | 0.89527 |
| 8 | 0.87941 |
| 9 | 0.89357 |
| 10 | 0.90172 |
| 11 | 0.89042 |
| 12 | 0.91154 |
| 13 | 0.92621 |
| 14 | 0.93704 |
| 15 | 0.92143 |
| 16 | 0.88685 |
| 17 | 0.87510 |
| 18 | 0.88643 |
| 19 | 0.88662 |
| 20 | 0.88317 |
| 21 | 0.87439 |
| 22 | 0.84693 |
| 23 | 0.88434 |
| 24 | 0.87625 |
| 25 | 0.87632 |
S105, by the method for range analysis, above 25 groups of data of obtaining of simulation are processed, obtain one side discontinuous
The technological parameter of the point type blank holder affecting laws to stamping-out piece surface serviceability rate, and obtain optimized technological parameter, use
Corresponding to range analysis method each technological parameter calculated Ij、Ⅱj、Ⅲj、Ⅳj、Ⅴ1, as shown in table 3；
Table 3 range analysis result of calculation
S106, j=1,2,3,4,5,6, I1、Ⅱ1、Ⅲ1、Ⅳ1With V1Between difference can be regarded as the difference of A factor
The affecting laws of the piece surface serviceability rate that last fine-edge blanking is obtained by level, I2、Ⅱ2、Ⅲ2、Ⅳ2With V2Between difference
Can be regarded as the affecting laws of the piece surface serviceability rate that last fine-edge blanking is obtained by the varying level of B factor, I3、Ⅱ3、
Ⅲ3、Ⅳ3With V3Between difference to can be regarded as the piece surface that last fine-edge blanking obtains by the varying level of C factor complete
The affecting laws of availability ratio, I4、Ⅱ4、Ⅲ4、Ⅳ4With V4Between difference can be regarded as the varying level of D factor to last accurate
The affecting laws of the piece surface serviceability rate that stamping-out obtains, I5、Ⅱ5、Ⅲ5、Ⅳ5With V5Between difference can be regarded as D factor
The varying level affecting laws of piece surface serviceability rate that last fine-edge blanking is obtained, I6、Ⅱ6、Ⅲ6、Ⅳ6With V6Between
Difference reflect error, the error that makes discovery from observation not is the biggest；
S107, result to range analysis carry out research and find A3B4C1D3E4For optimized technological parameter, but wherein
C factor (distance between adjacent protrusion point edge) find in research above, its parameter value needs to consider processing
Difficulty and fine-punching formation part quality, thus here value be 0.45mm be suitable, if value is 0.25mm, will make
On blank holder, the point of EDS maps is too much, increases difficulty of processing, if value is excessive, fine blanking part quality can not reach requirement, institute
With finally by the most optimized parameter obtained by optimization of orthogonal test as A3B4C2D3E4, i.e. the diameter of raised points is chosen for 1.4mm,
In raised points, rounding selection of dimension is 0.5mm, and the distance between adjacent protrusion point edge is chosen for 0.45mm, and (this value meets
The span of the spacing of the point above studied and point edge), the distance choosing between the raised points center of circle and blank holder inner ring
Being taken as 3.2mm, the height of raised points is chosen for 1.0mm, wherein rounding size, raised points in the diameter of raised points, raised points
The ratio between distance and the height of raised points and thickness of slab between the center of circle and blank holder inner ring is respectively 0.35,0.125,
0.8,0.25, according to orthogonal test simulation study, then rely on the application in actual production, process discontinuous point type blank holder
Time, the proportionate relationship of blank holder technological parameter is all feasible in following certain limit, it may be assumed that the diameter diameter/plate of raised points
Thick=0.3～0.4, rounding size/thickness of slab=0.1～0.15 in raised points, between the raised points center of circle and blank holder inner ring
Distance/thickness of slab=0.75～0.85, height/thickness of slab=0.2 of raised points～0.3, test carrys out stamping-out with this proportion
During other thin plates, it was demonstrated that choosing of its parameter is also feasible；
S2, use the determination of two-sided discontinuous point type blank holder critical condition, along with stamping thickness of slab increases, fine mistake
The part quality using one side discontinuous point type blank holder to obtain in journey does not reaches requirement, discontinuous with the one side obtained by above
It is the part of 4mm, 4.5mm, 5mm, 5.5mm that the parameter selection rules of point type blank holder carrys out stamping-out thickness of slab respectively, and one side is discontinuous
The technological parameter of point type blank holder is as shown in table 4；
Table 4 one side discontinuous point type blank holder technological parameter
S201, be respectively 93.88% with above parameter stamping-out piece surface serviceability rate out, 92.25%, 89.81%,
89.23%, it is found that when the thickness of slab of stamping increases to 5mm, use one side discontinuous point type blank holder to carry out stamping-out
Obtained piece surface serviceability rate can not reach more than 90%, now needs to use two-sided discontinuous point type blank holder to carry out essence
Close stamping-out, 5mm is then the critical thickness of slab value that two-sided discontinuous point type blank holder uses, when the thickness of slab of stamping is less than 5mm,
Use one side discontinuous point type blank holder to carry out stamping-out and just can obtain the preferable part of surface quality, when the thickness of slab of stamping is big
When equal to 5mm, use two-sided discontinuous point type blank holder to carry out stamping-out and just can obtain the preferable part of surface quality；
S202, the optimization of two-sided discontinuous point type blank holder technological parameter, two-sided discontinuous point type blank holder is except in essence
Have on stamping die blank holder outside a series of raised points, fine blanking die die also has a series of raised points, two-sided non-company
The technological parameter of continuous point type blank holder mainly has in the distance between adjacent protrusion point edge, the diameter of raised points, raised points
Distance between fillet size, the raised points center of circle and blank holder inner ring and the height of raised points, point type pressure discontinuous with one side
The method for designing of flange is the same, and the distance optimization between adjacent protrusion point edge needs to consider blank holder to stamping matter
Amount and the impact of difficulty of processing, so it being carried out single factor analysis in Deform-3D, the optimization spacing obtained is
0.4～0.5mm, other technological parameters are by selecting suitable orthogonal table L25(56), and combine Deform-3D software and variance
Analysis is optimized, and determines the relation between each technological parameter and thickness of slab, then combines with experiment, find they with thickness of slab it
Between ratio range be respectively 0.3～0.4,0.1～0.5,0.75～0.85,0.15～0.25.
The present invention is when specifically applying, and as shown in Figure 4, fine blanking die includes punch 2, die 4, discontinuous point type blank holder
1, counter 5 and blank 3, fine obtains straight spur gear part as shown in Figure 5, and the dimensional parameters of gear member is shown in Table 5.
Table 5
| Parameter | Numerical value |
| Number of teeth z | 2 |
| Normal module mn(mm) | 20 |
| Pressure angle α (0) | 20 |
| Facewidth b (mm) | 5 |
The facewidth according to above-mentioned straight spur gear determines the type of discontinuous point type blank holder, owing to the facewidth is 5mm, reaches
Arrive the critical condition of the two-sided discontinuous point type blank holder of employing, therefore during fine, use two-sided discontinuous point type blank holder.
When using two-sided discontinuous point type blank holder, point considers difficulty of processing and point type pressure with the spacing of point edge
The flange influence degree to blanking part cross section quality, value is 0.45mm, and has certain between other technological parameter and facewidth
Relation, according to this relation, determines during stamping-out straight spur gear institute's rounding angle square on two-sided point type blank holder spot diameter, point
Very little, the some distance size of die point and the height value of point, each parameter value is as shown in table 6.
Table 6
According to design load, process a series of point along tooth profile, i.e. define discontinuous point type blank holder, non-company
Continuous point type blank holder perspective view is as shown in Figure 3.
According to above-mentioned process parameters design, it is simulated by Deform-3D software, successfully uses discontinuous point type pressure
Flange fine has obtained the preferable straight spur gear of section mass ratio, as shown in Figure 5.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (4)
1. a fine blanking die discontinuous point type blank holder, this blank holder includes point type blank holder body, described point type blank holder
Along the uniform one group of raised points of part outline of required fine-punching formation on the lower surface of body, each described raised points sets
There is rounding, it is characterised in that when the thickness of the part of required fine-punching formation is less than 5mm, described point type blank holder is one side,
Distance between adjacent protrusion point edge is 0.4～0.5mm, rounding size, projection in the diameter of described raised points, raised points
Distance between the some center of circle and blank holder inner ring, the height of raised points and the ratio of part thickness be respectively 0.3～0.4,0.1～
0.15,0.75～0.85,0.2～0.3；When the thickness of the part of required fine-punching formation is more than or equal to 5mm, recessed at fine blanking die
The upper surface of mould is provided with the one group raised points identical with described point type blank holder body epirelief origin parameters, adjacent protrusion point limit
Distance between edge is 0.4～0.5mm, rounding size, the raised points center of circle and flanging in the diameter of described raised points, raised points
Distance between circle inner ring, the height of raised points and the ratio of part thickness be respectively 0.3～0.4,0.1～0.5,0.75～
0.85,0.15～0.25.
Blank holder the most according to claim 1, it is characterised in that when the thickness of the part of required fine-punching formation is less than 5mm
Time, the distance between adjacent protrusion point edge is 0.45mm, rounding size, projection in the diameter of described raised points, raised points
Distance between the some center of circle and blank holder inner ring, the height of raised points and the ratio of part thickness be respectively 0.35,0.125,
0.8、0.25。
Blank holder the most according to claim 1, it is characterised in that when the thickness of the part of required fine-punching formation is more than or equal to
During 5mm, the distance between adjacent protrusion point edge is 0.45mm, rounding size in the diameter of described raised points, raised points, convex
The ratio of distance between the starting point center of circle and blank holder inner ring, the height of raised points and part thickness is respectively 0.35,0.125,
0.8、0.18。
4. the method for designing of the fine blanking die discontinuous point type blank holder technological parameter described in more than one any claim, its
It is characterised by, comprises the following steps:
S1, when the thickness of part of required fine-punching formation is less than 5mm, use one side discontinuous point type blank holder, i.e. only at point
Along the uniform one group of raised points of part outline of required fine-punching formation, work to be optimized on the lower surface of formula blank holder body
Skill parameter includes rounding size, the raised points center of circle in the distance between adjacent protrusion point edge, the diameter of raised points, raised points
And the distance between blank holder inner ring and the height of raised points:
The optimization of the distance between S101, adjacent protrusion point edge: its Optimality Criteria is in the case of not affecting difficulty of processing,
Improve the cross section quality of stamping；In the FEM (finite element) model of fine blanking die, for different part thickness, from 0～1mm,
Interval 0.05mm changes the distance on blank holder between adjacent protrusion point edge, observes the cross section quality of stamping, when adjacent
When distance between raised points edge is positioned at 0.4～0.5mm, the cross section quality of stamping is good, and blank holder difficulty of processing is low, therefore
Distance between adjacent protrusion point edge is 0.4～0.5mm；
In S102, the diameter of raised points, raised points distance between rounding size, the raised points center of circle and blank holder inner ring and
The optimization of the height of raised points: on the basis of the value of the parameters of the V-arrangement blank holder of corresponding different part thickness, Mei Geyou
Change factor all carries out value near the parameter of V-arrangement blank holder, by between each optimizing factors and adjacent protrusion point edge
The span of distance is divided into 5 levels, the orthogonal test table of design five factors and five levels, determines test number (TN) 25 times, is just implementing
Hand over testing program, measure the surface serviceability rate of part obtained by each group of simulation test, by range analysis method to 25 groups of numbers
According to processing, obtain each technological parameter affecting laws to stamping-out piece surface serviceability rate, adjacent convex in integrating step S101
Play the value requirement of distance between point edge, obtain theoretical best parameter group, analyze each theoretical best parameter group and zero
The relation of part thickness of slab understands, in the diameter of raised points, raised points between rounding size, the raised points center of circle and blank holder inner ring
Distance, the height of raised points and the ratio of part thickness be respectively 0.3～0.4,0.1～0.15,0.75～0.85,0.2～
0.3；
S2, when required fine-punching formation part thickness more than or equal to 5mm time, use two-sided discontinuous point type blank holder, i.e. exist
On the lower surface of point type blank holder body and the upper surface of fine blanking die die is each along the External Shape of required fine-punching formation
The uniform one group of raised points of profile, technological parameter to be optimized include the distance between adjacent protrusion point edge, the diameter of raised points,
Distance between rounding size, the raised points center of circle and blank holder inner ring and the height of raised points in raised points:
The optimization of the distance between S201, adjacent protrusion point edge: repeat step S101, the distance between adjacent protrusion point edge
It is 0.4～0.5mm；
In S202, the diameter of raised points, raised points distance between rounding size, the raised points center of circle and blank holder inner ring and
The optimization of the height of raised points: repeat step S102, rounding size in the diameter of raised points, raised points, the raised points center of circle with
Distance, the height of raised points between blank holder inner ring are respectively 0.3～0.4,0.1～0.5,0.75 with the ratio of part thickness
～0.85,0.15～0.25.
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| CN108080509A (en) * | 2017-12-08 | 2018-05-29 | 四川航天长征装备制造有限公司 | Drop hammer die cavity plate backing plate and application process |
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