Mould and method for correcting deformation of XC119-1 edging profile frame arch bridge for spaceflight

Abstract

The invention belongs to the technical field of profile frames for spaceflight, and particularly relates to an XC119-1 edge placing profile frame arch bridge deformation correction die and method for spaceflight, the XC119-1 edge placing profile frame arch bridge deformation correction die comprises a base plate for fixing a female die on a machine tool workbench, and the base plate is fixedly connected with the female die; the female die is used for containing a part, the male die used in cooperation with the female die is arranged above the female die, the profile frame is placed between the female die and the male die, the male die enables the root of the part to be stressed to generate local plastic deformation, and therefore the purpose of shaping and correcting the profile frame is achieved. The method can effectively solve the problems of low processing efficiency, high labor intensity, difficulty in guaranteeing technical requirements, product scrapping and the like caused by stress deformation of the bottom plate arch bridge after stretch bending forming, can quickly finish flatness shape correction of such parts, and is simple in principle and high in applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace profile frames, and in particular relates to a deformation correction die and method for an arch bridge of an XC119-1 side-release profile frame for aerospace. Background Art

[0002] Profile frame parts are structural parts, which together with stringers, skins and other parts form the rocket body, and are one of the important radial load-bearing parts. They are annular components with L-shaped cross-sections at different angles. Common materials are LC9-M super-hard aluminum alloy profiles. Common specifications are standard profiles such as XC119-1, XC128-6 (acute angle), and XC137-6 (obtuse angle). Such parts can be divided into profile frames, frames, and half-frame rings by name, and most of them have an arc length of 180 degrees. The maximum arc radius of such parts is about R2000mm, and the arc length can reach 6 meters.

[0003] The main steps of forming profile frame parts are: 1. Pre-bending to a certain arc using a tire mold by a bending machine - 2. Heat treatment and quenching - 3. Bending and forming using a tire mold by a bending machine - 4. Manual correction to meet technical requirements. The flatness of the parts is detected by checking the gap with the detection platform (feeler gauge). The flatness accuracy of the bottom plate affects the vertical deviation of the vertical edge, which will interfere with the normal assembly of the product and may even cause the product of the section to exceed the tolerance. The accuracy of the parts plays a vital role in the size of the final product of the section.

[0004] XC119-1 profile frame sheet metal parts are divided into two categories: closed frame and open frame. Figure 2 , Figure 3 The bottom plate is embedded in the groove designed on the frame mold to constrain the bottom plate, which can effectively control the flatness of the bottom plate and reduce the deformation of the parts after drawing. When the frame is drawn and bent, there is no effective constraint on the bottom plate. Figure 1 , Figure 4 , resulting in obvious deformation, its shape is similar to an arch bridge, such as Figure 5 .

[0005] Since the L-shaped vertical plate of the part has a 4° angle bevel, the thickness of the upper edge is only 2mm, and the thickness of the root is 6mm. The thickness of the vertical plate is inconsistent. When the bottom plate is stretched outward without constraint, the thickness of the upper edge of the vertical plate is thin and the material is more, and the fiber extension and lengthening degree is greater than the root, so the bottom plane arch bridge deformation is formed. During correction, due to the thin thickness of the upper edge end face, it is impossible to directly hammer the end face with a hammer (for vertical plates and other thick frames, hammering the end face to correct the flatness is a traditional method). Hammering will cause the vertical plate to collapse and become shorter, resulting in out-of-tolerance scrap. For a long time, the bottom surface flatness is less than 2mm, which can only be appropriately corrected by reverse correction of the arch bridge of the bottom plate. It is impossible to directly apply force near the root of the deformation, which barely meets the technical requirements. And the correction time is as long as 2 to 3 hours, the labor intensity is high, the production efficiency is low and the quality is poor. For products with a flatness greater than 2mm, they are basically scrapped, and there is no effective solution for a long time. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a deformation correction die and method for an XC119-1 edge profile frame arch bridge for aerospace use, which can effectively solve the problems of low processing efficiency, high labor intensity, difficulty in ensuring technical requirements, product scrapping, etc. caused by stress deformation of the bottom plate arch bridge after stretch bending. At the same time, the correction efficiency of the bottom plate flatness is increased by nearly 100 times, effectively ensuring product quality.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A deformation correction die for an XC119-1 edge-laying profile frame arch bridge for aerospace use comprises a pad for fixing a die on a machine tool workbench, wherein the pad is fixedly connected to the die; the die is used to place parts, and a matching punch is arranged above the die, and the profile frame is placed between the die and the punch, and the punch causes the root of the part to be stressed to produce local plastic deformation, thereby achieving the purpose of shaping and correcting the profile frame.

[0009] Preferably, a groove-shaped notch is processed in the middle portion of the die, and the width of the groove-shaped notch is approximately twice the width of the punch.

[0010] Preferably, rounded corners are provided on both sides of the die, and the protruding portion on the rear side has an arc that matches the vertical plate of the profile frame part, so as to be used for positioning the part.

[0011] Preferably, an annular groove is provided at the lower end of the punch, and the cross-sectional shape thereof has a gap of 0.5-1 mm according to the cross-sectional size of the part.

[0012] Preferably, both sides of the punch and the inner surface of the groove are provided with rounded corners.

[0013] Preferably, the middle 20 mm of the contact area between the lower end surface of the punch and the part is a straight line surface, and the remaining left and right sides are also processed with a certain curvature.

[0014] Preferably, one end of the male die is also connected to a die handle, and the other end of the die handle is installed on the die handle hole of the punch press.

[0015] A method for using a deformation correction die for an XC119-1 edge-released profile frame arch bridge for aerospace use, comprising the following steps:

[0016] S1. Select appropriate stamping equipment, install the tooling on the equipment, adjust the gap and secure it firmly.

[0017] S2. Place the stretch-bent parts on the inspection platform, check the deformation area of ​​the arch bridge, then place the part that needs to be corrected in the correction area of ​​the lower die of the tooling and close to the mold surface, and start the equipment to perform stamping correction in the deformation area of ​​the arch bridge.

[0018] The present invention has the following advantages:

[0019] (1) The present invention can effectively solve the problems of low processing efficiency, high labor intensity, difficulty in ensuring technical requirements, and product scrapping caused by stress deformation of the bottom plate arch bridge after stretching and bending. At the same time, the manual correction time of the product bottom plate flatness is increased from 2 to 3 hours to more than 10 minutes, which increases the flatness correction efficiency by 100 times and ensures the processing quality. The new XC119-1 edge profile frame arch bridge deformation correction mold and method can quickly complete the flatness correction of such parts. The method is simple in principle and has strong applicability.

[0020] (2) Based on a full analysis of the deformation principle of this type of frame parts, the present invention combines the sheet metal cold work correction method to rationally design a correction mold, and combines with suitable stamping equipment to accurately hammer the area near the root of the deformation, so that the problem is effectively solved and the product production cycle is shortened. This method has the advantages of simple principle and strong applicability. Practice has proved that this XC119-1 side profile frame arch bridge deformation correction mold and method is a new method that is very suitable for L-shaped profile frame bottom plate flatness arch bridge deformation correction in related industries. The technical requirements of the parts corrected by this method are easy to meet, the surface hammering marks are significantly reduced, and the efficiency is improved and scrap is eliminated to reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of bending the frame profile;

[0022] Figure 2 It is a schematic diagram of the closed frame;

[0023] Figure 3 It is a schematic diagram of the border;

[0024] Figure 4 This is a comparison diagram of the molds for the frame retracting and frame putting;

[0025] Figure 5 This is a schematic diagram of the arch-bridge deformation of the part;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the mold of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the male mold of the present invention;

[0028] Figure 8 It is a schematic diagram of the mold operation of the present invention;

[0029] In the figure, 1, pad; 2, die; 3, punch; 4, die handle. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] like Figure 6 As shown, an embodiment of the present invention provides a deformation correction die for an XC119-1 edge profile frame arch bridge for aerospace use, including a pad that fixes the die on a machine tool workbench, and the pad is fixedly connected to the die; the die is used to place parts, and a matching punch is provided above the die, and the profile frame is placed between the die and the punch, and the punch causes the root of the part to be stressed to produce local plastic deformation, thereby achieving the purpose of shaping and correcting the profile frame. A groove-shaped notch is machined in the middle part of the die, and the width of the groove-shaped notch is approximately twice the width of the punch, providing a reasonable plastic deformation space. Chamfers are set on both sides of the die to prevent the generation of severe indentations; the protruding part on the rear side has an arc that matches the vertical plate of the profile frame part for positioning the part, ensuring that the vertical plate is accurately and safely embedded in the punch groove.

[0033] In this embodiment, the lower end of the punch is provided with an annular groove, and its cross-sectional shape is 0.5-1mm gapped according to the cross-sectional size of the part to ensure the free entry and exit of the part. Both sides of the punch and the inner surface of the groove are provided with rounded corners to prevent the generation of serious indentations. At the same time, the contact part between the lower end surface of the punch and the part is processed with a certain arc except for the middle 20mm which is a straight line, and the remaining left and right sides are also processed with a certain arc, which can better adapt to the contact situation of plastic deformation during stamping, so that the punch and the correction surface of the part are more fully in contact, and the correction effect is more obvious, see above Figure 7 A magnified view of the middle punch head. One end of the punch is also connected to a die handle, and the other end of the die handle is installed on the die handle hole of the punch press.

[0034] When correcting the shape, the punch press drives the punch downward, and the punch acts on the root F of the part. Figure 8 The root is subjected to force and produces local plastic deformation, thus achieving the purpose of plastic surgery.

[0035] The thickness of the upper edge of the XC119-1 profile frame is only 1.8mm, so it is impossible to directly use a hammer to hit the end face for shape correction. In addition, since the root and bottom plate of the part are thicker, a greater impact force is required to produce obvious deformation. Ordinary sheet metal correction tool hammers cannot achieve obvious correction effects. Only by using a mold combined with stamping equipment to replace the hammer, can the deformation area of ​​the arch bridge at the root of the part be reversely corrected to complete the correction work.

[0036] 1. Select appropriate stamping equipment, install the tooling on the equipment, adjust the gap and fix it firmly.

[0037] 2. Place the bent parts on the inspection platform, check the deformation area of ​​the arch bridge, and then place the part to be corrected in the correction area of ​​the lower die of the tooling and close to the mold surface. Start the equipment to perform stamping and correction in the deformation area of ​​the arch bridge. Note that each time the stamping and correction is performed, the deformation area of ​​the part needs to be moved from front to back for a distance so that the entire area can be corrected. The slider stroke height can only be at the beginning when the upper touch correction head just touches the surface of the part. After completing a round of correction of the deformation area of ​​the arch bridge, place the part on the inspection platform to check whether the flatness gap meets the requirements, and then gradually increase the slider pressing height as needed. Repeat the operation until the part meets the technical requirements.

[0038] The present invention utilizes a die combined with a stamping device to replace hammering, performs reverse correction on the arch bridge at the root of the part, and completes the correction work.

[0039] The present invention is not limited to the aforementioned specific embodiments. The present invention extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed. Those of ordinary skill in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific statements and embodiments.

[0040] A person skilled in the art may, based on the technical teachings disclosed in the present invention, make various other specific modifications and combinations without departing from the essence of the present invention, and these modifications and combinations are still within the protection scope of the present invention.

Claims

1. A deformation correction die for XC119-1 side profile frame arch bridge for aerospace use, characterized in that: It includes a pad that fixes the die on the workbench of a machine tool, and the pad is fixedly connected to the die. The die is used to place parts, and a punch is provided on the die for matching. The profile frame is placed between the die and the punch, and the punch causes the root of the part to be stressed to produce local plastic deformation, thereby achieving the purpose of shaping and correcting the profile frame.

2. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 1 is characterized in that: A groove-shaped notch is processed in the middle of the concave die, and the width of the groove-shaped notch is approximately twice the width of the punch.

3. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 2, characterized in that: The two sides of the die are provided with rounded corners, and the convex part on the rear side has an arc adapted to the vertical plate of the profile frame part for positioning the part.

4. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 1, characterized in that: The lower end of the punch is provided with an annular groove, and the cross-sectional shape thereof has a gap of 0.5-1 mm according to the cross-sectional size of the part.

5. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 4 is characterized in that: Both sides of the punch and the inner surface of the groove are provided with rounded corners.

6. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 4, characterized in that: The middle 20mm of the contact position between the lower end face of the punch and the part is a straight line surface, and the remaining left and right sides are also processed with a certain curvature.

7. The XC119-1 edge-released profile frame arch bridge deformation correction die for aerospace use according to claim 4, characterized in that: One end of the male die is also connected to a die handle, and the other end of the die handle is installed on the die handle hole of the punch press.

8. A method for using the XC119-1 edge-released profile frame arch bridge deformation correction mold for aerospace use according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Select appropriate stamping equipment, install the tooling on the equipment, adjust the gap and fix it firmly; S2. Place the stretch-bent parts on the inspection platform, check the deformation area of ​​the arch bridge, then place the part that needs to be corrected in the correction area of ​​the lower die of the tooling and close to the mold surface, and start the equipment to perform stamping correction in the deformation area of ​​the arch bridge.

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