Composite die and method for one-time forming of edge cutting and correction of forged blade

Abstract

The invention relates to the technical field of aero-engine blade forging, in particular to a composite die and method for one-time forming of edge cutting and correction of a forged blade. The composite die comprises a punch, and the molded surface of the lower end of the punch is matched and attached to the upper surface of the forged blade. The female die is provided with a mold hole matched with the peripheral contour of the forged blade, and the edge of the opening part of the mold hole forms a cutting edge; and the punch can be inserted into the hole of the female die. The correcting die is installed in the hole of the female die, the peripheral face of the correcting die is in sliding fit with the hole, and the correcting die is used for bearing the forged blade and is matched with the punch to tightly hold the forged blade subjected to edge cutting; the upper end molded surface of the correcting die is matched and attached to the lower surface of the forged blade. The elastic reset assembly is arranged below the correcting die and used for forming upward elastic force on the correcting die and pushing the correcting die to reset upwards. The die can complete two procedures of trimming and correcting through one-time heating, and the qualification rate of the trimming procedure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine blade forging, and in particular to a composite die and method for one-step forming of forged blade trimming and correction. Background Art

[0002] In the forging process of aircraft engine blades, trimming and correction processes are important processes for blade forming, which have a great impact on the qualified rate of forgings. In the traditional punching process, the forgings fall directly under the female die, and the forgings accumulated under the female die need to be cleaned manually, which not only affects the work efficiency, but also may cause the forgings to be untimely and the punch to press down and damage the blades. In addition, the forgings are prone to deformation during the punching process, and the deformation caused by the trimming process of the forgings needs to be eliminated through the correction process. After the trimming process, it is necessary to go through marking, removing the protective coating, milling, grinding, spraying glass lubricant and heating processes before correction can be performed, which requires a long cycle and high production cost. Therefore, there is an urgent need for a composite mold that can trim and correct the edges in one step to achieve the purpose of shortening the production cycle, reducing production costs and improving production efficiency. Summary of the invention

[0003] The main purpose of the present invention is to provide a composite die and method for one-step forming of forged blade trimming and correction, so as to solve the problem that aero-engine forged blades are easily deformed and damaged after punching, and shorten the production cycle.

[0004] To achieve the above object, on the one hand, the present invention provides a composite die for forging blade trimming and correction forming in one step, comprising:

[0005] A punch, wherein the lower end profile of the punch matches and fits with the upper surface of the forged blade.

[0006] The female die is provided with a die hole matching the outer peripheral contour of the forged blade, and the edge of the mouth of the die hole forms a cutting edge; the punch can be inserted into the die hole of the female die.

[0007] A correction die is installed in the die hole of the female die, and the outer peripheral surface of the correction die is slidably matched with the die hole. The correction die is used to carry the forged blades and cooperate with the punch to hold the forged blades after trimming; the upper end surface of the correction die matches and fits with the lower surface of the forged blades.

[0008] The elastic reset component is arranged below the correction mold and is used to form an upward elastic force on the correction mold and push the correction mold to reset upward.

[0009] Preferably, the elastic reset assembly comprises:

[0010] The base is arranged directly below the correction mold, and an elastic distance is arranged between the top surface of the base and the bottom surface of the correction mold.

[0011] The first cylinder is embedded in the through hole of the base, and the first cylinder has an inner cavity with an open upper end.

[0012] The second cylinder is slidably inserted in the inner cavity of the first cylinder, and the second cylinder has an inner cavity with an open lower end; an elastic distance is set between the lower end surface of the second cylinder and the bottom wall of the inner cavity of the first cylinder.

[0013] A spring is arranged in the inner cavity of the second cylinder, and the upper end of the spring abuts against the inner cavity top wall of the second cylinder, and the lower end of the spring abuts against the inner cavity bottom wall of the first cylinder.

[0014] Preferably, a countersunk hole is provided at the lower end of the correction mold; and the top end of the second cylinder is inserted into the countersunk hole.

[0015] Preferably, a limiting platform is integrally formed on the outer peripheral surface of the bottom end of the correction mold; a sinking platform is provided on the lower end surface of the female mold; the limiting platform is installed in the sinking platform of the female mold, and the step of the sinking platform faces the top surface of the limiting platform to form a limit.

[0016] Preferably, four columns are installed on the top of the female mold, and a material blocking plate is installed on the top ends of the four columns; a notch is provided on the material blocking plate; and the punch is inserted in the notch.

[0017] Preferably, a clamping ridge is integrally formed on the top surface of the punch.

[0018] Preferably, the cross section of the clamping ridge is in an inverted trapezoidal shape.

[0019] Preferably, the size of the single-sided gap between the outer peripheral surface of the punch and the die hole of the female die is positively correlated with the burr thickness on the forged blade.

[0020] Preferably, when the burr thickness on the forged blade is 1.0-1.9 mm, the single-sided gap between the outer peripheral surface of the punch and the die hole of the female die is 0.1 mm; when the burr thickness on the forged blade is 2.0-2.9 mm, the single-sided gap between the outer peripheral surface of the punch and the die hole of the female die is 0.2 mm; when the burr thickness on the forged blade is 3.0-3.8 mm, the single-sided gap between the outer peripheral surface of the punch and the die hole of the female die is 0.3 mm; when the burr thickness on the forged blade is 4.0-5.0 mm, the single-sided gap between the outer peripheral surface of the punch and the die hole of the female die is 0.4 mm.

[0021] On the other hand, the present invention also provides a method for trimming and correcting a forged blade in one step, using the above-mentioned composite die, comprising the following steps:

[0022] S1: Install the punch of the composite die on the clamping seat of the pressing plate of the trimming press, and install the elastic reset component and the female die of the composite die on the working table of the trimming press;

[0023] S2: Use the trimming press to drive the punch upward to separate the punch from the female die;

[0024] S3: placing the heated forged blade on the female die and supporting it on the lower surface of the forged blade by a correction die;

[0025] S4: The punch is driven downward by the trimming press, and the trimming is completed by the cutting edge of the female die; the punch continues to move downward, thereby driving the trimmed forged blade and the correction die downward, and at the same time, the punch and the correction die hold the trimmed forged blade tightly for correction, so that no warping occurs during forging;

[0026] S5: After the pressure is maintained, the punch is driven upward by the trimming press, and the correction die is pushed upward and reset under the action of the elastic reset component, so that the forged blade after trimming can be taken out.

[0027] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0028] (1) By adopting the composite die provided by the present invention, when the punch is used, the edge of the female die is used to complete the trimming; the punch continues to move downward, thereby driving the trimmed forged blade and the correction die to move downward, and at the same time, the punch and the correction die hold the trimmed forged blade for correction, so that no warping occurs during forging. Therefore, the trimming and correction processes can be completed by heating once; the number of scraps caused by problems such as misalignment or cracking can be effectively reduced, and the qualified rate of the trimming process can be ensured.

[0029] (2) The use of the composite die provided by the present invention will eliminate six auxiliary processes, and the forging production cycle is expected to be shortened from 50 days to 45 days, which is about 10% shorter than the original production cycle, and will also reduce the cost of electricity, coatings, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 This is a front view of the composite mold provided by the present invention;

[0032] Figure 2 This is a left side view of the composite mold provided by the present invention;

[0033] Figure 3 for Figure 2 The cross-sectional view along AA in the figure;

[0034] Figure 4 It is a schematic diagram of the assembly structure formed by the baffle plate and the column in the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the female mold in the present invention;

[0036] Figure 6 It is a schematic diagram of the structure when the punch and the correction die cooperate with each other in the present invention;

[0037] Figure 7 It is a structural schematic diagram of the correction mold in the present invention.

[0038] Explanation of the accompanying drawings: 1. Punch; 1a. Clamping ridge; 2. Female die; 2a. Mould hole; 2b. Countersunk table; 3. Correction die; 3a. Countersunk hole; 3b. Limit table; 4. Elastic reset assembly; 4a. Base; 4b. First cylinder; 4c. Spring; 4d. Second cylinder; 5. Column; 6. Material stop plate; 6a. Notch. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] As shown in the accompanying drawings, on the one hand, this embodiment provides a composite die for forging blade trimming and correction in one step, comprising:

[0043] The punch 1 has a lower end profile that matches and fits with the upper surface of the forged blade.

[0044] The female die 2 is provided with a die hole 2a matching the outer peripheral contour of the forged blade, and the edge of the mouth of the die hole 2a forms a cutting edge; the punch 1 can be inserted into the die hole 2a of the female die 2.

[0045] The correction die 3 is installed in the mold hole 2a of the female die 2, and the outer peripheral surface of the correction die 3 is slidably matched with the mold hole 2a. The correction die 3 is used to carry the forged blades and cooperate with the punch 1 to hold the forged blades after trimming; the upper end surface of the correction die 3 matches and fits with the lower surface of the forged blades.

[0046] The elastic reset component 4 is arranged below the correction mold 3 and is used to form an upward elastic force on the correction mold 3 and push the correction mold 3 to reset upward.

[0047] Combination Figure 3 As shown, the elastic reset component 4 includes:

[0048] The base 4a is arranged directly below the correction mold 3, and an elastic spacing is arranged between the top surface of the base 4a and the bottom surface of the correction mold 3, and the elastic spacing is not less than 20mm.

[0049] The first cylinder 4b is embedded in the through hole of the base 4a, and the first cylinder 4b has an inner cavity with an open upper end.

[0050] The second cylinder 4d is slidably inserted into the inner cavity of the first cylinder 4b, and the second cylinder 4d has an inner cavity with an open lower end; an elastic distance is set between the lower end surface of the second cylinder 4d and the bottom wall of the inner cavity of the first cylinder 4b.

[0051] The spring 4c is arranged in the inner cavity of the second cylinder 4d, and the upper end of the spring 4c abuts against the inner cavity top wall of the second cylinder 4d, and the lower end abuts against the inner cavity bottom wall of the first cylinder 4b.

[0052] Combination Figure 3 and Figure 7 As shown, a countersunk hole 3a is provided at the lower end of the correction mold 3; the top end of the second cylinder 4d is inserted into the countersunk hole 3a. The countersunk hole 3a cooperates with the second cylinder 4d to position the correction mold 3.

[0053] Furthermore, a limiting platform 3b is integrally formed on the outer peripheral surface of the bottom end of the correction mold 3; a sinking platform 2b is arranged on the lower end surface of the female mold 2; the limiting platform 3b is installed in the sinking platform 2b of the female mold 2, and the step of the sinking platform 2b faces the top surface of the limiting platform 3b to form a limit, thereby limiting the reset height of the correction mold 3.

[0054] Combination Figures 1 to 4 As shown, four columns 5 are installed on the top of the female mold 2, and a material blocking plate 6 is installed on the top of the four columns 5; a notch 6a is provided on the material blocking plate 6; and the punch 1 is inserted into the notch 6a. After the trimming is completed, when the punch 1 moves upward, the cut burrs will move with the punch 1, so the purpose of setting the material blocking plate 6 is to block the cut burrs.

[0055] Combination Figure 2 , Figure 6 As shown, a clamping ridge 1a is integrally formed on the top surface of the punch 1. Further, the cross section of the clamping ridge 1a is inverted trapezoidal. The purpose of providing the clamping ridge 1a is to facilitate the installation of the punch 1 on the clamping seat of the trimming press.

[0056] In this embodiment, the size of the single-sided gap between the outer peripheral surface of the punch 1 and the die hole 2a of the female die 2 is positively correlated with the burr thickness on the forged blade. Specifically, when the burr thickness on the forged blade is 1.0-1.9mm, the single-sided gap between the outer peripheral surface of the punch 1 and the die hole 2a of the female die 2 is 0.1mm; when the burr thickness on the forged blade is 2.0-2.9mm, the single-sided gap between the outer peripheral surface of the punch 1 and the die hole 2a of the female die 2 is 0.2mm; when the burr thickness on the forged blade is 3.0-3.8mm, the single-sided gap between the outer peripheral surface of the punch 1 and the die hole 2a of the female die 2 is 0.3mm; when the burr thickness on the forged blade is 4.0-5.0mm, the single-sided gap between the outer peripheral surface of the punch 1 and the die hole 2a of the female die 2 is 0.4mm. The details are shown in the following table:

[0057] Serial number Burr thickness(mm) Single side clearance (mm) 1 1.0～1.9 0.1 2 2.0～2.9 0.2 3 3.0～3.8 0.3 4 4.0～5.0 0.4

[0058] On the other hand, this embodiment also provides a method for trimming and correcting a forged blade in one step, using the above-mentioned composite die, comprising the following steps:

[0059] S1: Install the punch 1 of the composite mold on the clamping seat of the pressure plate of the trimming press, and install the elastic reset component 4 and the female mold 2 of the composite mold on the workbench of the trimming press;

[0060] S2: Using the trimming press to drive the punch 1 upward, so that the punch 1 is separated from the female die 2;

[0061] S3: placing the heated forged blade on the female die 2, and supporting the lower surface of the forged blade with the correction die 3;

[0062] S4: The punch 1 is driven downward by the trimming press, and the trimming is completed by the cutting edge of the female die 2; the punch 1 continues to move downward, thereby driving the trimmed forged blade and the correction die 3 downward, and at the same time, the punch 1 and the correction die 3 hold the trimmed forged blade tightly for correction, so that no warping occurs during forging;

[0063] S5: After the pressure is maintained, the punch 1 is driven upward by the trimming press, and the correction die 3 is pushed upward and reset under the action of the elastic reset component 4, so that the forged blade after trimming can be taken out.

[0064] The trimming press is conventional existing equipment and will not be described in detail here.

[0065] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A composite die for forging blade trimming and correction in one step, characterized in that: include: A punch (1), wherein the lower end profile of the punch (1) matches and fits with the upper surface of the forged blade; A female die (2), wherein the female die (2) is provided with a die hole (2a) matching the outer peripheral contour of the forged blade, the mouth edge of the die hole (2a) forms a cutting edge, and the punch (1) can be inserted into the die hole (2a) of the female die (2); A correction die (3), the correction die (3) being installed in the die hole (2a) of the female die (2), the outer peripheral surface of the correction die (3) being slidably matched with the die hole (2a), the correction die (3) being used to carry the forged blades and to cooperate with the punch (1) to hold the forged blades after trimming; the upper end profile of the correction die (3) is matched and fitted with the lower surface of the forged blades; The elastic reset component (4) is arranged below the correction mold (3) and is used to form an upward elastic force on the correction mold (3) and push the correction mold (3) to reset upward.

2. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: The elastic reset component (4) comprises: A base (4a), the base (4a) being arranged directly below the correction mold (3), and an elastic spacing being arranged between the top surface of the base (4a) and the bottom surface of the correction mold (3); A first cylinder (4b), wherein the first cylinder (4b) is embedded in the through hole of the base (4a), and the first cylinder (4b) has an inner cavity with an open upper end; A second cylinder (4d), the second cylinder (4d) is slidably inserted in the inner cavity of the first cylinder (4b), the second cylinder (4d) having an inner cavity with an open lower end; an elastic spacing is provided between the lower end surface of the second cylinder (4d) and the inner cavity bottom wall of the first cylinder (4b); A spring (4c), wherein the spring (4c) is arranged in the inner cavity of the second cylinder (4d), and the upper end of the spring (4c) abuts against the inner cavity top wall of the second cylinder (4d), and the lower end abuts against the inner cavity bottom wall of the first cylinder (4b).

3. A composite die for forging blade trimming and correction in one step as claimed in claim 2, characterized in that: A countersunk hole (3a) is provided at the lower end of the correction mold (3); and the top end of the second cylinder (4d) is inserted into the countersunk hole (3a).

4. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: A limiting platform (3b) is integrally formed on the outer peripheral surface of the bottom end of the correction mold (3); a sinking platform (2b) is provided on the lower end surface of the female mold (2); the limiting platform (3b) is installed in the sinking platform (2b) of the female mold (2), and the step of the sinking platform (2b) faces the top surface of the limiting platform (3b) to form a limit.

5. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: Four columns (5) are installed on the top of the female mold (2), and a material blocking plate (6) is installed on the top of the four columns (5); a notch (6a) is provided on the material blocking plate (6); and the punch (1) is inserted into the notch (6a).

6. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: A clamping ridge (1a) is integrally formed on the top surface of the punch (1).

7. A composite die for forging blade trimming and correction in one step as claimed in claim 6, characterized in that: The cross section of the clamping ridge (1a) is in the shape of an inverted trapezoid.

8. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: The size of the single-sided gap between the outer peripheral surface of the punch (1) and the die hole (2a) of the female die (2) is positively correlated with the burr thickness on the forged blade.

9. A composite die for forging blade trimming and correction in one step as claimed in claim 1, characterized in that: When the burr thickness on the forged blade is 1.0 to 1.9 mm, the single-side clearance between the outer peripheral surface of the punch (1) and the die hole (2a) of the female die (2) is 0.1 mm; When the burr thickness on the forged blade is 2.0 to 2.9 mm, the single-side clearance between the outer peripheral surface of the punch (1) and the die hole (2a) of the female die (2) is 0.2 mm; When the burr thickness on the forged blade is 3.0-3.8 mm, the single-side clearance between the outer peripheral surface of the punch (1) and the die hole (2a) of the female die (2) is 0.3 mm; When the burr thickness on the forged blade is 4.0-5.0 mm, the single-side clearance between the outer peripheral surface of the punch (1) and the die hole (2a) of the female die (2) is 0.4 mm.

10. A method for trimming and correcting forged blades in one step, characterized in that: The composite mold according to any one of claims 1 to 9 comprises the following steps: S1: Mounting the punch (1) of the composite die on the clamping seat of the pressure plate of the trimming press, and mounting the elastic reset assembly (4) and the female die (2) of the composite die on the working table of the trimming press; S2: using a trimming press to drive the punch (1) upward, so that the punch (1) is separated from the female die (2); S3: placing the heated forged blade on the female die (2), and supporting the lower surface of the forged blade with the correction die (3); S4: The punch (1) is driven downward by the trimming press, and the trimming is completed by using the cutting edge of the female die (2); The punch (1) continues to move downward, thereby driving the trimmed forged blade and the correction die (3) downward, and at the same time, the punch (1) and the correction die (3) hold the trimmed forged blade tightly to correct it, so that no warping occurs during forging; S5: After the pressure is maintained, the trimming press drives the punch (1) upward, and the correction die (3) is pushed upward and reset under the action of the elastic reset component (4), so that the forged blade after trimming can be taken out.

Images