Processing die and method for u-shaped knife-shaped double-flanged stainless steel part

Abstract

The application belongs to the technical field of aviation sheet metal part manufacturing, and particularly relates to a machining die and method for a U-shaped knife-shaped double-bent-edge stainless steel part. The machining die comprises a working matrix 1 and a forming matrix 2. The working matrix 1 is provided with an inclined angle groove A, the forming matrix 2 is provided with a convex inclined block B matched with the inclined angle groove A of the working matrix 1, and the forming matrix 2 is provided with a profile surface 3 matched with the part to be formed. The movable range of the part is constrained by the inclined groove and the convex block, the movement of the part is prevented, and the forming process is simplified by using the axe-shaped profile surface pen nib nylon block to assist forming.

Description

Technical Field

[0001] This invention belongs to the field of aerospace sheet metal parts manufacturing technology, and particularly relates to the processing mold and method for U-shaped double-bent stainless steel parts. Background Technology

[0002] Stainless steel is characterized by its high hardness, high tensile strength, and severe work hardening, making it a difficult material to form in aerospace sheet metal processing. Some stainless steel parts in aerospace sheet metal production, due to their unique shapes and significant springback, are difficult to form mechanically, posing a significant challenge in parts production. Examples include U-shaped, double-bent-edge parts. Currently, these parts can only be formed manually using molds, a complex process that results in poor surface and forming quality, requiring extensive manual reshaping. Summary of the Invention

[0003] The technical problem solved by the present invention is that it overcomes the shortcomings of the prior art and provides a processing mold and method for U-shaped double-bent stainless steel parts. By utilizing the unique self-positioning function of this mold, the degree of freedom of the parts is restricted, which facilitates the precise forming of the rounded and curved edges at both ends of the "U" parts.

[0004] The technical solution of this invention:

[0005] On one hand, the present invention provides a processing mold for a U-shaped knife-shaped double-bent stainless steel part. The processing mold includes: a working body 1 and a forming body 2. The working body 1 has an angled groove A, the forming body 2 has a convex inclined block B that matches the angled groove A of the working body 1, and the forming body 2 has a profile 3 that matches the part to be formed.

[0006] Furthermore, the working body 1 and the forming body 2 are fitted together, and a gap of material thickness is left in the forming area.

[0007] Furthermore, the processing mold has a pinless structure.

[0008] Furthermore, the convex inclined block B of the forming body 2 and the angled groove A of the working body 1 are used to limit the range of motion of the parts.

[0009] On the other hand, the present invention also provides a method for processing U-shaped, double-bent stainless steel parts, the method being implemented using the aforementioned processing mold, the processing method comprising:

[0010] Step 1: Calculate the unfolded dimensions of the required raw material 4, which is used to form U-shaped parts;

[0011] Step 2: Press the blank material 4 at a 90° angle according to the minimum bending dimension of the part's shape;

[0012] Step 3: Use the feeding module of the Yago machine to stretch and feed the blank 4 along the arc areas at both ends of the part 7, so that the blank 4 has the curvature of the part 7 at both ends.

[0013] Step 4: Fix the raw material 4 onto the processing mold;

[0014] Step 5: Push the blank material 4 to make it fit tightly against the processing mold;

[0015] Step 6: Draw lines on the blank 4 according to the outline of the part on the molded body 2, and cut off the excess part to obtain part 7.

[0016] Further, step one involves calculating the required unfolded dimensions of the raw material 4, specifically including:

[0017] For concave curve forming on machines like the Yago, the edge allowance is uniform. The edge material in the edge allowance area thins as the curvature increases, and radial shrinkage occurs simultaneously. The amount of shrinkage... Within the material forming limit, the width of the blank 4 is b = b′ + k. After obtaining the unfolded size of the arc area, adding the size of the straight area gives the unfolded size of the blank 4. Among them, after the arc area of ​​the part is unfolded, b is the width of the blank 4. After passing through the arc fan shape of the Accor mechanism, R is the inner diameter of the fan, R' is the outer diameter of the fan, and b' is the width of the fan.

[0018] Furthermore, step four specifically involves:

[0019] Place the blank 4 on the working body 1, cover the blank 4 with the forming body 2, and tighten the working body 1 and the forming body 2 with G-clamps. The clamping position of the G-clamps is below the oblique groove of the working body 1 and above the convex oblique block of the forming body 2.

[0020] Furthermore, step five specifically involves:

[0021] Using the wedge-shaped head of the axe-shaped nylon pressure block 6, press the rough material 4 point by point along the arc root of the rough material 4. Repeat this several times, then use a rubber board and a bakelite hammer to correct and make the rough material 4 fit tightly against the processing mold.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] (1) A new mold structure was designed, which simplified the processing process, changed the manual forming method, and ensured that the processing was more convenient;

[0024] (2) The mold effectively restricts the dimensions of the part's movement, reduces the amount of deformation of the part during forming, and improves the part's fit to the mold and surface quality.

[0025] (3) The point-by-point forming method is adopted to avoid the problem of material accumulation in the arc area. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the part's structure;

[0027] Figure 2 This is a schematic diagram of the mold structure;

[0028] Figure 3 This is a schematic diagram of the axe-shaped nylon nib pressing block structure;

[0029] Figure 4 This is a schematic diagram illustrating the forming principle of the present invention;

[0030] Figure 5 This is a schematic diagram of the deformation of the circular arc area;

[0031] Among them: 1. working body, 2. forming body, 7. parts, 4. raw material, 5. G-type clamp, 6. axe-shaped nib nylon pressing block. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 3 As shown, in order to more effectively process U-shaped knife-shaped bent edge parts, the specific tooling structure is designed as follows: Figure 2 As shown, it includes: a working body 1 and a forming body 2. The working body 1 has an angled groove A, and the forming body 2 has a convex inclined block B that matches the angled groove A of the working body 1. The forming body 2 has a profile 3 that matches the part to be formed. A G-type clamp 5 clamps the working body 1 and the forming body 2 together. The clamping position is below the angled groove of the working body 1 and above the convex inclined block of the forming body 2. The profiles of the working body 1 and the forming body 2 fit together, and a gap of one material thickness is left in the forming area.

[0034] In the specific design, the angled groove A of the working body 1 and the convex inclined block B of the forming body 2 are used to limit the range of motion of the parts. This structure can reduce the positioning control of the parts during manual operation.

[0035] Using the machining fixtures designed above, a method for machining large-curvature double-bent-edge parts is implemented, such as... Figure 4 As shown, the specific steps include:

[0036] The first step is to design and process the mold structure. The mold is a pinless structure, consisting of two parts: a working mold and a forming mold. The working mold has an angled groove structure, and the forming mold is designed in a stepped shape. The working mold and the forming mold mesh with each other.

[0037] The second step is to bend the long strip of material into a 90° angle on one side, and then use an Ago machine to lay the edges of the arc areas at both ends of the part according to the shape of the mold. This method can easily form an accurate single-sided arc area shape, and the surface quality of the part on one side is good.

[0038] The third step is to manually form the parts. After bending, the blank is placed on the working die and pressed down by the forming die. At the same time, the mold is clamped with a G-clamp. Under the action of the groove angle of the working die, the greater the clamping force, the greater the lateral extrusion force of the die. Since the part is U-shaped, the forming die and the working die will automatically align. This achieves the ideal state of simple clamping and bidirectional force.

[0039] The fourth step involves manually forming the part and bending the edges a second time. Using an axe-shaped nylon pressure block with a pen tip, the raw material is repeatedly squeezed along the root of the curved edge at both ends of the part. This point-by-point forming avoids the accumulation of raw material, and the edge is manually turned over while the material is being released.

[0040] The processing method of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments:

[0041] Step 1: Calculate the required unfolded dimensions of the raw material 4, mainly focusing on the unfolded dimensions of the arc area of ​​part 7, such as... Figure 5 As shown, assuming that after the arc area of ​​part 7 is unfolded, a is the length of the raw material 4, b is the width of the raw material 4, after being formed into an arc fan by the Accor machine, R is the inner diameter of the fan, R' is the outer diameter of the fan, b' is the width of the fan, l is the inner arc length of the fan, l' is the outer arc length of the fan, and the length of l' is related to R' and b'. When the Accor machine forms the fan area, it is subjected to lateral tensile force, which will produce radial shrinkage, and k is the shrinkage ratio.

[0042] Step two: For concave curve forming on machines like the Yago, the edge allowance is uniform. The edge material in the edge allowance area of ​​the raw material will thin as the curvature increases, and radial shrinkage will occur. The shrinkage amount is calculated using an empirical formula. At this time, the value of k is close to the difference in radial shrinkage of the arc. That is, when k = 2, the difference in radial shrinkage is 2 mm. Calculate the arc area development size according to this method. Within the material forming limit range, b = b′ + k. After obtaining the arc area development size, add the straight area size to get the development size of the rough material 4.

[0043] Step 3: Press the blank material 4 at a 90° angle according to the minimum bending dimension of the part's shape;

[0044] Step 4: Use the feeding module of the Yago machine to stretch and feed the blank 4 along the arc areas at both ends of the part 7, so that the blank 4 has a curvature at both ends of the part 7.

[0045] Step 5: Place the raw material 4 on the working body 1, cover the raw material 4 with the forming body 2, and at the same time use G-clamps to tighten the working body 1 and the forming body 2. The clamping position is below the oblique groove of the working body 1 and above the convex oblique block of the forming body 2.

[0046] Step 6: Use the axe-shaped nylon pressure block 6 with the wedge-shaped head to push and press the rough material 4 point by point along the arc root of the rough material 4. Repeat this several times, and then use a rubber board and a bakelite hammer to correct the rough material 4 so that it fits the mold.

[0047] Step 7: Draw lines on the blank 4 according to the outline of the part on the molded body 2, and cut off the excess part to obtain part 7.

[0048] This invention provides a mold and processing method suitable for processing U-shaped, blade-shaped curved parts. The process significantly reduces the forming difficulty of such parts. By utilizing inclined grooves and protrusions to constrain the part's range of motion and prevent movement, and using an axe-shaped pen-tip nylon pressure block to assist forming, the forming process is simplified. This optimized process not only improves production efficiency but also enhances part quality.

Claims

1. A method for processing U-shaped, double-bent stainless steel parts, characterized in that, The method is implemented using a U-shaped knife-shaped double-bent stainless steel part processing mold. The processing mold includes: a working body (1) and a forming body (2). The working body (1) has an angled groove A, and the forming body (2) has a convex inclined block B that matches the angled groove A of the working body (1). The forming body (2) has a profile (3) that matches the part to be formed. The processing method includes: Step 1: Calculate the unfolded dimensions of the required raw material (4), which is used to form U-shaped parts; Step 1, calculating the unfolded dimensions of the required raw material (4), specifically includes: For concave curve forming on machines like the Yago, the edge allowance is uniform. The edge material in the edge allowance area thins as the curvature increases, and radial shrinkage occurs simultaneously. The amount of shrinkage... Within the material forming limit, the width of the blank (4) After obtaining the arc area unfolded size, add the straight area size to get the unfolded size of the raw material (4); where, after the arc area of ​​the part is unfolded, b is the width of the raw material (4), after passing through the arc fan shape of the Accor mechanism, R is the inner diameter of the fan shape, R' is the outer diameter of the fan shape, and b' is the width of the fan shape. Step 2: Press the raw material (4) at a 90° angle according to the minimum bending dimension of the part's shape; Step 3: Use the feeding module of the Yago machine to stretch and feed the blank (4) along the arc area at both ends of the part (7), so that the blank (4) has the curvature of the part (7) at both ends; Step 4: Fix the raw material (4) onto the processing mold; Step 4 specifically involves: Place the blank (4) on the working body (1), cover the blank (4) with the forming body (2), and clamp the working body (1) and the forming body (2) with G-clamps. The clamping position of the G-clamps is below the oblique groove of the working body (1) and above the convex oblique block of the forming body (2). Under the action of the oblique angle of the groove of the working body, the greater the clamping force, the greater the lateral squeezing force of the body. Since the part is U-shaped, the forming body and the working body will automatically align. Step 5: Press the raw material (4) to make it fit tightly against the processing mold; Step 5 specifically includes: Use the axe-shaped nylon pressure block (6) with the wedge-shaped head to push the rough material (4) point by point along the arc root of the rough material (4). Repeat this several times, then use a rubber board and a bakelite hammer to correct the rough material (4) so ​​that it fits tightly against the processing mold. Step 6: Draw lines on the blank (4) according to the outline of the part on the molded body (2), and cut off the excess part to obtain part (7).

2. The processing method for the U-shaped, double-bent stainless steel part according to claim 1, characterized in that, The working body (1) fits the surface of the forming body (2) and leaves a gap of one material thickness in the forming area.

3. The processing method for the U-shaped, double-bent stainless steel part according to claim 1, characterized in that, The processing mold has a pinless structure.

4. The processing method for the U-shaped, double-bent stainless steel part according to claim 1, characterized in that, The convex inclined block B of the forming body (2) and the oblique groove A of the working body (1) are used to limit the range of motion of the parts.

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