CN111745108A - Method for blanking arched rod of arched precision-forged blade - Google Patents
Method for blanking arched rod of arched precision-forged blade Download PDFInfo
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- CN111745108A CN111745108A CN202010615133.5A CN202010615133A CN111745108A CN 111745108 A CN111745108 A CN 111745108A CN 202010615133 A CN202010615133 A CN 202010615133A CN 111745108 A CN111745108 A CN 111745108A
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- rod
- female die
- cavity
- blade
- workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a method for making a blank of an arched precision forging blade bent rod. The correcting punch is additionally arranged to correct the tenon, and finally the problem of the tilting deformation of the tenon is thoroughly solved. The blade crown is used for positioning and bending the rod, so that the blade crown is not deformed along with the rod part, and the relative relation between the direction of the bent rod and the tenon blade crown is accurately controlled.
Description
Technical Field
The invention belongs to the field of blank making of blade bent rods, and particularly relates to a method for making a blank of an arched precision-forged blade bent rod.
Background
The blade profile of a certain machine three-stage stator blade adopts an arch structure, the blade profile begins to bend towards the blade back at the joint of a blade body and a flange plate, the transition position of a blade basin side and the flange plate forms an acute angle, the whole blade profile is bent into an arch shape, and the angle formed by blade profile bending is about 120 degrees.
The blade of the three-stage stator of a certain machine is seriously bent due to the integral over-bending of the blade body, and is directly pre-forged and formed by using a traditional upsetting blank, so that the requirement on the metal storage capacity of the blade body due to the change of the geometric length of the blade body or the influence of the flowing direction of metal on the forging flow line cannot be met, and therefore, a bent rod must be bent on the upsetting blank. In order to meet the pre-form dimensions and the metal flow line requirements of the blade, the upset needs to be formed by bending the rod into a shape according to the pre-forge design.
The forming of the bent rod piece needs to meet the following requirements of 3 points:
firstly, ensuring the size and the shape of the bent rod part;
ensuring that the tenon N and the blade crown M are not deformed along with the bending of the rod part;
and ensuring the relative relation between the bending direction of the rod part and the tenon blade crown.
The bent rod is used for bending the top forging piece and is never used in the domestic blank making process of the precision forging blade. According to the metal forming rule, after the upset forging piece bends, the crotch span size is reduced, two ends of the upset forging piece are inclined to form a certain angle to form a splayed shape, and the result obviously cannot meet the requirements of the pre-forging forming of the blade.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for manufacturing a bent rod blank of an arched finish-forged blade, which can ensure that a blade crown and a tenon do not deform along with a rod part when the rod is bent.
In order to achieve the above object, the present invention comprises the steps of:
designing a tenon cavity, a rod cavity and a blade crown cavity on a static female die according to the shape of a workpiece, so that the length of the rod cavity on the static female die is equal to the length of a geometric central line of the rod of the workpiece;
step two, arranging a correcting block on the movable female die, and arranging a correcting punch outside the tenon cavity, so that the tenon keeps static when the rod part is stressed and deformed;
putting the workpiece into a static female die, and buckling a movable female die with the static female die;
and step four, performing rod bending operation on the rod part cavity by taking the blade shroud as a positioning reference to obtain the final forged piece.
In the first step, the length of the geometric center line of the rod part of the workpiece is calculated according to the three-dimensional shape of the workpiece.
The tenon cavity, the rod part cavity and the blade crown cavity are on the same axis.
In the second step, the correction block is arranged at the upper part of the maximum outline of the blade shroud.
In the fourth step, the bending rod operation is that when the movable female die is buckled with the static female die, the movable female die continuously extrudes the workpiece in the static female die, so that the rod part of the workpiece is deformed.
In the fourth step, the macroscopic flow lines of the final forged piece are distributed along the shape.
Compared with the prior art, the invention has the advantages that when the movable female die moves downwards to bend the rod, the tenon is not in a free forming state any more but deforms under the limitation of the limiting correcting block due to the existence of the limiting correcting block. The correcting punch is additionally arranged to correct the tenon, and finally the problem of the tilting deformation of the tenon is thoroughly solved. The blade crown is used for positioning and bending the rod, so that the blade crown is not deformed along with the rod part, and the relative relation between the direction of the bent rod and the tenon blade crown is accurately controlled.
Drawings
FIG. 1 is a schematic illustration of a final forging;
FIG. 2 is a schematic view of a stationary die;
FIG. 3 is a longitudinal section of the final forging.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the present invention includes the steps of:
designing a tenon cavity, a rod cavity and a blade crown cavity on a static female die according to the shape of a workpiece, wherein the tenon cavity, the rod cavity and the blade crown cavity are on the same axis, so that the length of the rod cavity on the static female die is equal to the length of a geometric central line of the rod of the workpiece;
step two, arranging a correction block on the movable female die, wherein the correction block is arranged at the upper part of the maximum outline of the blade crown, and arranging a correction punch outside a tenon cavity to keep the tenon static when the rod part is stressed and deformed;
putting the workpiece into a static female die, and buckling a movable female die with the static female die;
and step four, performing rod bending operation on the rod part cavity by taking the blade shroud as a positioning reference to obtain the final forged piece. In the bending rod operation, when the movable female die is buckled with the static female die, the movable female die continuously extrudes a workpiece in the static female die, so that the rod part of the workpiece is deformed.
Example (b):
the shape and size of the bending of the stem is ensured by the die.
On the female die, a cavity is designed according to the figure 1, and the forming is carried out by utilizing the clamping force of the movable female die and the static female die. To ensure that forging defects do not occur during the forming process, it is critical that the geometric centerline length dimension L1 of the stem portion shown in FIG. 1 be precisely determined. It has been verified that the length L1 of the geometric center line of the stem of the workpiece should be equal to the length L2 of the stem cavity on the static female die in fig. 2. The length of the stem cavity on the die block, L2, was calculated by three-dimensional modeling to determine the dimension of the geometric centerline length of the stem of the workpiece, L1, such that L2 is L1.
It is ensured that the tenon N and the tip shroud M are not deformed by the bending of the rod portion.
And designing a limiting correction block on the movable female die according to the upper half part of the maximum outline of the tip shroud of the upsetting member. When the movable female die moves the bent rod downwards, the tenon N is not in a free forming state any more due to the existence of the limiting correcting block, but deforms under the limitation of the limiting correcting block. The warping deformation of the tenon N is greatly reduced, but the deformation still exists, in order to thoroughly solve the warping deformation problem of the tenon N, the correcting punch is additionally arranged to correct the tenon N, and finally, the warping deformation problem of the tenon N is thoroughly solved.
The blade crown is used for positioning and bending the rod, so that the blade crown is not deformed along with the rod part, and the relative relation between the direction of the bent rod and the tenon blade crown is accurately controlled.
Referring to fig. 3, the deformation of the blade shroud M is controlled by the cooperation of the movable female die and the stationary female die, and the deformation of the tenon N is controlled by the punch, so that a good foundation is provided for preforming and final forming. The macroscopic flow lines of the final forging piece are distributed along the shape basically, and the final forming obtains better effect.
The upsetting and the rod bending process are simultaneously carried out on one device, so that the phenomenon that the device and the heating frequency are additionally increased due to the rod bending process is avoided, and certain contribution is made to simplifying the process flow and improving the production efficiency.
Claims (6)
1. A method for manufacturing a blank of an arched precision forging blade bent rod is characterized by comprising the following steps:
designing a tenon cavity, a rod cavity and a blade crown cavity on a static female die according to the shape of a workpiece, so that the length of the rod cavity on the static female die is equal to the length of a geometric central line of the rod of the workpiece;
step two, arranging a correcting block on the movable female die, and arranging a correcting punch outside the tenon cavity, so that the tenon keeps static when the rod part is stressed and deformed;
putting the workpiece into a static female die, and buckling a movable female die with the static female die;
and step four, performing rod bending operation on the rod part cavity by taking the blade shroud as a positioning reference to obtain the final forged piece.
2. The method for blanking an arched precision-forged blade bent rod according to claim 1, wherein in the first step, the length of the geometric center line of the rod part of the workpiece is calculated according to the three-dimensional shape of the workpiece.
3. The method of claim 1 wherein the tenon cavity, the shank cavity and the shroud cavity are coaxial.
4. The method for blanking an arched forged blade bent rod according to claim 1, wherein in the second step, the correcting block is arranged at the upper part of the maximum outline of the blade shroud.
5. The method for blanking the bow-shaped precision forging blade bent rod according to claim 1, wherein in the fourth step, when the movable female die is buckled with the static female die, the movable female die continuously extrudes a workpiece in the static female die to deform the rod part of the workpiece.
6. The method for blanking the arched finish-forged blade bent rod according to claim 1, wherein in the fourth step, the hypoid flow lines of the finish forged piece are distributed along the shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010615133.5A CN111745108A (en) | 2020-06-30 | 2020-06-30 | Method for blanking arched rod of arched precision-forged blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010615133.5A CN111745108A (en) | 2020-06-30 | 2020-06-30 | Method for blanking arched rod of arched precision-forged blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111745108A true CN111745108A (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010615133.5A Pending CN111745108A (en) | 2020-06-30 | 2020-06-30 | Method for blanking arched rod of arched precision-forged blade |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204276771U (en) * | 2014-11-05 | 2015-04-22 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of press-bending of refinement twin shaft neck aluminium alloy vane grain size and blocking integration mold |
| CN204328448U (en) * | 2014-11-10 | 2015-05-13 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of upset part crossed bent blades forging and use |
| CN109590429A (en) * | 2018-11-27 | 2019-04-09 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of manufacturing process and mold of bias adjustable vane |
| CN110941900A (en) * | 2019-11-26 | 2020-03-31 | 中国航发沈阳黎明航空发动机有限责任公司 | Blade forging prefabricated blank design method capable of accurately controlling material flow distribution |
-
2020
- 2020-06-30 CN CN202010615133.5A patent/CN111745108A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204276771U (en) * | 2014-11-05 | 2015-04-22 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of press-bending of refinement twin shaft neck aluminium alloy vane grain size and blocking integration mold |
| CN204328448U (en) * | 2014-11-10 | 2015-05-13 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of upset part crossed bent blades forging and use |
| CN109590429A (en) * | 2018-11-27 | 2019-04-09 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of manufacturing process and mold of bias adjustable vane |
| CN110941900A (en) * | 2019-11-26 | 2020-03-31 | 中国航发沈阳黎明航空发动机有限责任公司 | Blade forging prefabricated blank design method capable of accurately controlling material flow distribution |
Non-Patent Citations (2)
| Title |
|---|
| 吴香菊等: "钛合金大斜角安装板整流叶片顶锻工艺研究 ", 《沈阳航空航天大学学报》 * |
| 张奇: "钛合金叶片精密模锻 ", 《航空制造技术》 * |
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Application publication date: 20201009 |