CN110941900A - Blade forging prefabricated blank design method capable of accurately controlling material flow distribution - Google Patents

Blade forging prefabricated blank design method capable of accurately controlling material flow distribution Download PDF

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CN110941900A
CN110941900A CN201911170183.0A CN201911170183A CN110941900A CN 110941900 A CN110941900 A CN 110941900A CN 201911170183 A CN201911170183 A CN 201911170183A CN 110941900 A CN110941900 A CN 110941900A
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forging
area
prefabricated blank
curve group
section
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CN110941900B (en
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黄明星
鞠秀义
汪大成
张东丽
单善
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AECC Shenyang Liming Aero Engine Co Ltd
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AECC Shenyang Liming Aero Engine Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides

Abstract

The invention discloses a method for designing a blade forging preformed blank capable of accurately controlling material flow distribution, which breaks through the traditional design thought, designs the preformed blank capable of realizing refined metal flow distribution by performing slice scanning analysis according to the designed forging structure, and realizes the preparation of the preformed blank by the traditional blank making means.

Description

Blade forging prefabricated blank design method capable of accurately controlling material flow distribution
Technical Field
The invention relates to the field of blade forging prefabricated blank design, in particular to a blade forging prefabricated blank design method capable of accurately controlling material flow distribution.
Background
With the development of the aviation technology, the requirements of blades as important components of the advanced aero-engine compressor on raw materials and forging blanks are more severe, so that the material cost and the forging cost are increased sharply, higher requirements are provided for the traditional blade forging, the blade forging with qualified performance and size is provided, the material utilization rate is maximized, the size stability of the forging is improved, the service life of a forging die is effectively prolonged, and the forging cost is effectively reduced, but the requirements are difficult to realize for the blades with non-axisymmetric structures, such as adjustable blades, and the traditional preform mode and design determine.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for designing a blade forging preformed blank capable of accurately controlling material flow distribution, which has the following specific technical scheme:
a method of blade forging preform design with precisely controlled material flow distribution, comprising the steps of:
the method comprises the following steps: in the forging direction, projecting the forging piece into a two-dimensional graph, and carrying out slice segmentation in the two-dimensional graph to find out a central point on each section;
step two: a series of central points obtained in the two-dimensional graph are taken as sample lines, and the parts with approximate curvatures of the sample lines are simplified into straight lines for processing;
step three: obtaining a group of normal phase cross sections by means of normal direction section lines at each central point and curvature change point on the sample line;
step four: on the basis of the three-dimensional model, projecting the section obtained by sectioning the forging by each normal section into a two-dimensional graph, inquiring the area by using software, properly increasing the area of burrs, converting the area of the burrs into a circle with equal area, and taking the circle center as a control point on the sample line in the second step;
step five: repeating the step four, completing the conversion of the circle with the same area of the whole section, and fitting and unifying the groups of similar curves with the diameters within 1mm into a circle with the same diameter;
step six: using three-dimensional software to make the obtained equal-area circular curve group as a curve group entity to obtain a bent prefabricated blank;
step seven: designing a correspondingly formed bending die on the basis of the bent prefabricated blank;
step eight: and stretching the sample line obtained in the step two by using three-dimensional software, keeping the size of the normal equal-area circular curve group obtained in the step five unchanged at the same time to obtain a new curve group, obtaining a prefabricated blank prepared by using a traditional blank making method by using the curve group as an entity, and bending the prefabricated blank in the step seven to obtain six bent prefabricated blanks which are designed in the step six and can be used for final forming.
The preferable scheme of the method for designing the prefabricated blank of the blade forging is that the bending die in the step seven is designed in such a way that the bending cavity and the pre-forging cavity are separately arranged and combined on a set of forging dies from left to right, and the purposes of one die with two cavities and one fire with two forgings are achieved.
The preferred scheme of the method for designing the blade forging prefabricated blank is that the stretched new curve group entity prefabricated blank in the step eight is obtained by adopting the step design of upsetting and upsetting on a horizontal press.
The invention has the beneficial effects that: the technical scheme of the invention breaks through the traditional design thought, the pre-forming blank capable of realizing refined metal flow distribution is designed according to the designed forging structure by slice type scanning analysis, and the preparation of the pre-forming blank is realized by the traditional blank making means, the novel design method can effectively and greatly improve the utilization rate of materials, improve the control requirement of the deformation, reduce the equipment striking difficulty, prolong the service life of the die, reduce the forging cost, and simultaneously realize better size control and stability, the blade forging produced by the method has the advantages that the material utilization rate is averagely improved by more than 20 percent, the average service life of the die is prolonged by more than 30 percent, the structure performance completely meets the labeling requirement, and the forging is 100 percent qualified.
Drawings
FIG. 1 is a schematic two-dimensional projection of a forging direction;
FIG. 2 is a schematic representation of a spline of a group of over-center stores;
FIG. 3 is a schematic cross-sectional view of a control point on a cross-line;
FIG. 4 is a schematic view of an equal area circle cut through a cross section;
FIG. 5 is a schematic view of a set of equal area circular curves for each of the sectioning sections;
FIG. 6 is a schematic representation of a solid preform of an over-area set of circular curves;
FIG. 7 is a schematic view of a formable bending die designed on the basis of a curved preform;
FIG. 8 is a preform that may be used for press bending.
Detailed Description
1-8, a method of blade forging preform design with precisely controlled material flow distribution includes the steps of:
the method comprises the following steps: in the forging direction, projecting the forging piece into a two-dimensional graph, and carrying out slice segmentation in the two-dimensional graph to find out a central point on each section;
step two: a series of central points obtained in the two-dimensional graph are taken as sample lines, and the parts with approximate curvatures of the sample lines are simplified into straight lines for processing;
step three: obtaining a group of normal phase cross sections by means of normal direction section lines at each central point and curvature change point on the sample line;
step four: on the basis of the three-dimensional model, projecting the section obtained by sectioning the forging by each normal section into a two-dimensional graph, inquiring the area by using software, properly increasing the area of burrs, converting the area of the burrs into a circle with equal area, and taking the circle center as a control point on the sample line in the second step;
step five: repeating the step four, completing the conversion of the circle with the same area of the whole section, and fitting and unifying the groups of similar curves with the diameters within 1mm into a circle with the same diameter;
step six: using three-dimensional software to make the obtained equal-area circular curve group as a curve group entity to obtain a bent prefabricated blank;
step seven: designing a correspondingly formed bending die on the basis of the bent prefabricated blank;
step eight: and stretching the sample line obtained in the step two by using three-dimensional software, keeping the size of the normal equal-area circular curve group obtained in the step five unchanged at the same time to obtain a new curve group, obtaining a prefabricated blank prepared by using a traditional blank making method by using the curve group as an entity, and bending the prefabricated blank in the step seven to obtain six bent prefabricated blanks which are designed in the step six and can be used for final forming.
And seventhly, the bending die is designed in such a way that the bending cavity and the pre-forging cavity are separately arranged and combined on a set of forging die from left to right, and the purpose of one die with two cavities and one fire with two forgings is achieved.
The preparation method of the stretched new curve group entity prefabricated blank adopts the upsetting step design and is obtained by upsetting on a horizontal press machine.
Example 1
The method comprises the following steps: determining the forging direction of the forging piece, projecting the forging piece contour to a two-dimensional graph on a forging surface by utilizing three-dimensional software such as UG (Unigraphics), transversely dividing the two-dimensional graph, wherein the number and the position of the divided sections depend on the structure and the size of the forging piece, the positions of the divided sections are divided densely in principle, the more the divided sections are, the more the calculation result is, marking the middle point on each dividing line after division, and marking the middle point on each dividing line from J as shown in figure 10Is divided into JnAnd a central point is pointed out;
step two: respectively marking the central points obtained in the step one as P0-PnDrawing a sample line through the set of center points, wherein P2-P(n-2)Can be simplified to a straight line for subsequent preform calculations, as shown in fig. 2;
step three: passing the center point of the second step to obtain a group A of section lines, and passing the curvature change point to obtain a group A of section lines0-AnIf 3, the normal phase cross-sectional line group of (1);
step four: on the basis of the three normal phase section groups, under the operation of three-dimensional software, sectioning the forging by each section, projecting the sectioned section into a two-dimensional graph, and inquiring the section area by using software, such as UG and CAXA to obtain a specific numerical value Sn，(SnCross-sectional area) and considering the appropriate burr area (S)m) The diameter phi D of the circle with equal area can be calculatednIs calculated by the formula
Figure BDA0002288497170000051
(φDnIs a cross-sectional circle of equal area) where the center of the circle is the control point on the sample line in step two, as shown in fig. 4;
step five: repeating the step four, after the conversion of the equal-area circle of the whole section is completed, fitting the similar curve groups with the diameter difference within 1mm into the circle with the same diameter size, and obtaining a group of equal-area circle curve groups as shown in fig. 5;
step six: using three-dimensional software to make a curve group entity of the equal-area curve group obtained in the fifth step to obtain a bending prefabricated blank, as shown in fig. 6;
step seven: designing a corresponding forming bending die based on the bent preform, as shown in fig. 7;
step eight: straightening the sample line obtained in the step two by using three-dimensional software, and keeping the six L types in the step1-L5The total length of the blank is kept unchanged, the size of the normal equal-area circle curve group of each part is kept unchanged, a new curve group is obtained, the curve group is used as an entity, the entity can be designed by adopting an upsetting process step and is prepared by upsetting on a horizontal press, and as shown in figure 8, the blank is bent by a bending die in the seventh step, so that six types of designed bent blanks which can be used for final forming can be obtained.

Claims (3)

1. A method of designing a preform for a blade forging capable of precisely controlling material flow distribution, comprising the steps of:
the method comprises the following steps: in the forging direction, projecting the forging piece into a two-dimensional graph, and carrying out slice segmentation in the two-dimensional graph to find out a central point on each section;
step two: a series of central points obtained in the two-dimensional graph are taken as sample lines, and the parts with approximate curvatures of the sample lines are simplified into straight lines for processing;
step three: obtaining a group of normal phase cross sections by means of normal direction section lines at each central point and curvature change point on the sample line;
step four: on the basis of the three-dimensional model, projecting the section obtained by sectioning the forging by each normal section into a two-dimensional graph, inquiring the area by using software, properly increasing the area of burrs, converting the area of the burrs into a circle with equal area, and taking the circle center as a control point on the sample line in the second step;
step five: repeating the step four, completing the conversion of the circle with the same area of the whole section, and fitting and unifying the groups of similar curves with the diameters within 1mm into a circle with the same diameter;
step six: using three-dimensional software to make the obtained equal-area circular curve group as a curve group entity to obtain a bent prefabricated blank;
step seven: designing a correspondingly formed bending die on the basis of the bent prefabricated blank;
step eight: and stretching the sample line obtained in the step two by using three-dimensional software, keeping the size of the normal equal-area circular curve group obtained in the step five unchanged at the same time to obtain a new curve group, obtaining a prefabricated blank prepared by using a traditional blank making method by using the curve group as an entity, and bending the prefabricated blank in the step seven to obtain six bent prefabricated blanks which are designed in the step six and can be used for final forming.
2. The method of claim 1, wherein: and seventhly, the bending die is designed in such a way that the bending cavity and the pre-forging cavity are separately arranged and combined on a set of forging die from left to right, and the purpose of one die with two cavities and one fire with two forgings is achieved.
3. The method of claim 1, wherein: and step eight, designing the stretched new curve group entity prefabricated blank by adopting an upsetting process step and upsetting on a horizontal press to obtain the stretched new curve group entity prefabricated blank.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111745108A (en) * 2020-06-30 2020-10-09 中国航发动力股份有限公司 Method for blanking arched rod of arched precision-forged blade
CN112749454A (en) * 2020-12-29 2021-05-04 中国航空工业集团公司西安飞机设计研究所 Construction method for arc-shaped variable-camber die forging
CN113486477A (en) * 2021-08-20 2021-10-08 中国航发沈阳黎明航空发动机有限责任公司 Method for designing prefabricated blank of high-temperature-resistant alloy complex single-tenon blade forging

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110021372A (en) * 2009-08-26 2011-03-04 주식회사 센트랄 A modeling method of preform for forging
CN106529069A (en) * 2016-11-24 2017-03-22 沈阳黎明航空发动机(集团)有限责任公司 Method for designing blade body margin of over-bent blade forge piece
CN107042273A (en) * 2017-05-23 2017-08-15 武汉理工大学 Hot forging forming mould and hot forging forming technique for not rounded bevel gear

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110021372A (en) * 2009-08-26 2011-03-04 주식회사 센트랄 A modeling method of preform for forging
CN106529069A (en) * 2016-11-24 2017-03-22 沈阳黎明航空发动机(集团)有限责任公司 Method for designing blade body margin of over-bent blade forge piece
CN107042273A (en) * 2017-05-23 2017-08-15 武汉理工大学 Hot forging forming mould and hot forging forming technique for not rounded bevel gear

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111745108A (en) * 2020-06-30 2020-10-09 中国航发动力股份有限公司 Method for blanking arched rod of arched precision-forged blade
CN112749454A (en) * 2020-12-29 2021-05-04 中国航空工业集团公司西安飞机设计研究所 Construction method for arc-shaped variable-camber die forging
CN113486477A (en) * 2021-08-20 2021-10-08 中国航发沈阳黎明航空发动机有限责任公司 Method for designing prefabricated blank of high-temperature-resistant alloy complex single-tenon blade forging
CN113486477B (en) * 2021-08-20 2023-06-09 中国航发沈阳黎明航空发动机有限责任公司 Design method of high-temperature-resistant alloy complex single-tenon blade forging preform

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