Machining die and method for U-shaped knife-shaped double-bent-edge stainless steel part

Abstract

The invention 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 mold comprises a working tire body 1 and a forming tire body 2, the working tire body 1 is provided with an oblique angle groove A, the forming tire body 2 is provided with a convex oblique block B matched with the oblique angle groove A of the working tire body 1, and the forming tire body 2 is provided with a molded surface 3 matched with a part to be formed. The movement range of the part is restrained through the slope groove and the protruding block, movement of the part is prevented, meanwhile, the axe-shaped surface pen point nylon pressing block is used for assisting forming, and the forming process is simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation sheet metal parts manufacturing, and in particular relates to a processing die and a method for a U-shaped knife-shaped double-bent-edge stainless steel part. Background Art

[0002] Stainless steel has the characteristics of high hardness, high tensile strength, and severe cold hardening, making it a difficult material to form in aviation sheet metal processing. Some stainless steel parts in aviation sheet metal are difficult to form mechanically due to their special shape and large springback, which makes it a difficult problem to solve in parts production, such as U-shaped knife-shaped double-bent edge parts. At present, such parts can only be formed manually by molds, which has a complicated forming process, poor surface quality and forming quality of parts, and requires a lot of manual shaping. Summary of the invention

[0003] Technical problem solved by the invention: The invention overcomes the deficiencies in the prior art, provides a processing mold and method for a U-shaped knife-shaped double-bent edge stainless steel part, and utilizes the unique self-positioning function of the mold to limit the degree of freedom of the part, thereby facilitating the precise forming of the arc warped edges at both ends of the "U" part.

[0004] The technical solution of the present invention:

[0005] On the one hand, the present invention provides a processing mold for a U-shaped knife-shaped double-bent stainless steel part, the processing mold comprising: a working carcass 1 and a forming carcass 2, the working carcass 1 having an oblique angle groove A, the forming carcass 2 having a convex oblique block B matching the oblique angle groove A of the working carcass 1, and the forming carcass 2 having a molding surface 3 matching the part to be formed.

[0006] Furthermore, the working carcass 1 and the forming carcass 2 are in conformity with each other, and a gap of material thickness is left in the forming area.

[0007] Furthermore, the processing mold is a pin-free structure.

[0008] Furthermore, the convex oblique blocks B of the forming carcass 2 and the oblique angle grooves A of the working carcass 1 are used to limit the range of movement of the parts.

[0009] On the other hand, the present invention also provides a method for processing a U-shaped knife-shaped double-bent stainless steel part, which is implemented by using the processing mold, and the processing method comprises:

[0010] Step 1: Calculate the unfolded size of the required rough material 4, which is used to form a U-shaped part;

[0011] Step 2: Press the rough material 4 to 90° according to the minimum bending size of the part shape;

[0012] Step 3: Use the unloading module of the Argo machine to stretch and unload the raw material 4 according to the arc areas at both ends of the part 7, so that both ends of the raw material 4 have the curvature of the part 7;

[0013] Step 4: Fix the rough material 4 on the processing mold;

[0014] Step 5: Push the rough material 4 to make it close to the processing mold;

[0015] Step 6: Draw a line on the rough material 4 according to the part outline on the formed tire body 2, and cut off the part excess to obtain the part 7.

[0016] Furthermore, step 1 calculates the required unfolded size of the raw material 4, specifically including:

[0017] For the concave curve forming of the same curvature as the Yagao machine, the amount of edge release is uniform and consistent. The edge material of the edge release area of ​​the raw material will become thinner as the arc curvature increases, and radial shrinkage will occur at the same time. Within the range of material forming limits, the width of the blank 4 is b=b′+k. The expanded size of the arc area plus the size of the straight area is the expanded size of the blank 4. Among them, after the arc area of ​​the part is expanded, b is the width of the blank 4. After the arc sector is formed by the Yago machine, R is the inner diameter of the sector, R' is the outer diameter of the sector, and b' is the width of the sector.

[0018] Furthermore, step 4 is specifically as follows:

[0019] Place the raw material 4 on the working carcass 1, cover the raw material 4 with the forming carcass 2, and tighten the working carcass 1 and the forming carcass 2 with a G-type clamp. The clamping position of the G-type clamp is below the oblique groove of the working carcass 1 and above the convex oblique block of the forming carcass 2.

[0020] Furthermore, step five is specifically as follows:

[0021] Use the axe-shaped pen tip nylon pressure block 6 wedge-shaped head to push the wool material 4 point by point along the arc root of the wool material 4. After repeated several times, use the rubber hitting board and bakelite hammer to correct the wool material 4 so that it is close to the processing mold.

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

[0023] (1) Design of new mold structure simplifies the processing process, changes the manual forming method, and ensures more convenient processing;

[0024] (2) The mold effectively limits the dimensions of the part's movement, reduces the deformation of the part during forming, and improves the part's adhesion and surface quality;

[0025] (3) The point-by-point forming method is adopted to avoid the problem of rough material accumulation in the arc area. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the parts structure;

[0027] Figure 2 Schematic diagram of the mold structure;

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

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

[0030] Figure 5 It is a schematic diagram of arc area deformation;

[0031] Among them: 1. working carcass, 2. forming carcass, 7. parts, 4. rough material, 5. G-type clamp, 6. axe-shaped pen tip nylon pressing block. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 3 As shown, in order to more effectively realize the processing of U-shaped knife-shaped bent edge parts, the specifically designed tooling structure is as follows: Figure 2 As shown, it includes: a working carcass 1 and a forming carcass 2, wherein the working carcass 1 has an oblique groove A, the forming carcass 2 has a convex block B matching the oblique groove A of the working carcass 1, and the forming carcass 2 has a profile 3 matching the part to be formed, and a G-type clamp 5 clamps the working carcass 1 and the forming carcass 2, and the clamping position is below the oblique groove of the working carcass 1 and above the convex block of the forming carcass 2, the working carcass 1 is matched with the profile of the forming carcass 2, and a gap of material thickness is left in the forming area.

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

[0035] Using the processing tooling designed as above, the large curvature double-bending edge parts processing method is implemented, such as Figure 4 As shown, the specific steps include:

[0036] The first step is to design the processing mold structure. The processing mold is a pin-free structure, which is divided into two parts: a working carcass and a forming carcass. The working carcass has an oblique groove structure, and the forming carcass is designed in a step shape. The working carcass and the forming carcass are meshed with each other.

[0037] In the second step, the long strip of raw material is bent on one side to a 90° angle, and the arc area at both ends of the part is placed using an Argo machine 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 single side of the part is good.

[0038] In the third step, when manually forming parts, the bent raw material is placed on the working tire body, pressed down with the forming tire body, and the mold is clamped with a G-type clamp. Under the action of the groove angle of the working tire body, the greater the clamping force, the greater the lateral extrusion pressure of the tire body. Since the shape of the part is concave, the forming tire body and the working tire body will automatically align, thus achieving the ideal state of simple clamping and two-way force.

[0039] The fourth step is to manually bend the parts for the second time. Use an axe-shaped nylon pressure block with a pen tip to repeatedly squeeze the raw material along the roots of the arcs at both ends of the parts. Use point-by-point forming to avoid the accumulation of raw material, and complete the flanging manually while releasing the material.

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

[0041] Step 1: Calculate the required unfolding size of the rough material 4, mainly the unfolding size of the arc area of ​​the part 7, such as Figure 5 As shown, assuming that 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, and after being formed into arc sectors by the Yago machine, R is the inner diameter of the sector, R' is the outer diameter of the sector, b' is the width of the sector, l is the inner arc length of the sector, l' is the outer arc length of the sector, and the length of l' is related to R' and b'. When the Yago machine forms the sector area, it is subjected to the action of the lateral tensile force, which will produce radial contraction, and k is the contraction ratio;

[0042] Step 2: For the concave curve forming of the same curvature as the Yagao machine, the amount of edge release is uniform and consistent. The edge material of the edge release area of ​​the raw material will become thinner as the arc curvature increases, and radial shrinkage will occur at the same time. The empirical calculation formula for shrinkage is At this time, the k value is close to the difference in radial contraction of the arc, that is, when k=2, the radial contraction difference is 2mm. According to this method, the arc area expansion size is calculated. Within the material forming limit range, b=b′+k. The arc area expansion size plus the straight area size is the expansion size of the rough material 4.

[0043] Step 3: Press the rough material 4 to 90° according to the minimum bending size of the part shape;

[0044] Step 4: Use the unloading module of the Argo machine to stretch and unload the raw material 4 according to the arc areas at both ends of the part 7, so that the raw material 4 has curvature at both ends of the part 7;

[0045] Step 5: Place the wool 4 on the working carcass 1, cover the wool 4 with the formed carcass 2, and clamp the working carcass 1 and the formed carcass 2 with a G-type clamp, with the clamping position below the oblique groove of the working carcass 1 and above the convex oblique block of the formed carcass 2;

[0046] Step 6: Use the axe-shaped pen tip nylon pressing block 6 wedge-shaped head to push the wool material 4 point by point along the arc root of the wool material 4, repeat several times, and use the rubber hitting board and bakelite hammer to correct the wool material 4 to fit the mold;

[0047] Step 7: Draw a line on the rough material 4 according to the part outline on the formed tire body 2, and cut off the part excess to obtain the part 7.

[0048] The technical solution of the present invention provides a mold and a processing method suitable for U-shaped knife-shaped curved edge parts. The process method of the present invention greatly reduces the difficulty of forming such parts, uses the inclined groove and the convex block to restrict the range of movement of the parts, prevents the movement of the parts, and uses the axe-shaped pen tip nylon pressing block to assist in forming, thereby simplifying the forming process. The optimization of the process method not only improves the production efficiency but also improves the quality of the parts.

Claims

1. The processing mold of U-shaped double-bent stainless steel parts is characterized by: The processing mold comprises: a working carcass (1) and a forming carcass (2), wherein the working carcass (1) has an oblique angle groove A, the forming carcass (2) has a convex oblique block B matching the oblique angle groove A of the working carcass (1), and the forming carcass (2) has a molding surface (3) matching the part to be formed.

2. The processing die for the U-shaped double-bent stainless steel part according to claim 1 is characterized in that: The working carcass (1) and the forming carcass (2) are matched with each other in profile, and a gap of material thickness is left in the forming area.

3. The processing die for the U-shaped double-bent stainless steel part according to claim 1 is characterized in that: The processing mold is a pin-free structure.

4. The processing die for the U-shaped double-bent stainless steel part according to claim 1, characterized in that: The convex oblique blocks B of the forming carcass (2) and the oblique angle grooves A of the working carcass (1) are used to limit the range of movement of the parts.

5. The processing method of U-shaped knife-shaped double-bent stainless steel parts is characterized in that: The method is implemented by using a processing mold as claimed in any one of claims 1 to 4, and the processing method comprises: Step 1: Calculate the unfolded size of the required rough material (4), which is used to form the U-shaped part; Step 2: Press the rough material (4) by 90° according to the minimum bending size of the part shape; Step 3: Use the unloading module of the Argo machine to stretch the raw material (4) according to the arc areas at both ends of the part (7) to unload the raw material (4) so ​​that both ends of the raw material (4) have the curvature of the part (7); Step 4: Fix the rough material (4) on the processing mold; Step 5: Push the rough material (4) to make it close to the processing mold; Step 6: Mark the rough material (4) according to the part outline on the formed tire body (2), and cut off the part excess to obtain the part (7).

6. The method for processing a U-shaped knife-shaped double-bent stainless steel part according to claim 5, characterized in that: Step 1: Calculate the required unfolded size of the raw material (4), specifically including: For the concave curve forming of the same curvature as the Yagao machine, the amount of edge release is uniform and consistent. The edge material of the edge release area of ​​the raw material will become thinner as the arc curvature increases, and radial shrinkage will occur at the same time. Within the material forming limit range, the width of the blank (4) is b=b′+k, and the expanded size of the arc area plus the size of the straight area is the expanded size of the blank (4); wherein, after the arc area of ​​the part is expanded, b is the width of the blank (4), and after the arc sector is formed by the Yago machine, R is the inner diameter of the sector, R′ is the outer diameter of the sector, and b′ is the width of the sector.

7. The method for processing a U-shaped double-bent stainless steel part according to claim 5, characterized in that: Step 4 is as follows: The raw material (4) is placed on the working carcass (1), the raw material (4) is covered with the forming carcass (2), and the working carcass (1) and the forming carcass (2) are clamped with a G-type clamp, wherein the clamping position of the G-type clamp is below the oblique groove of the working carcass (1) and above the convex oblique block of the forming carcass (2).

8. The method for processing a U-shaped knife-shaped double-bent stainless steel part according to claim 5, characterized in that: Step 5 is as follows: The wedge-shaped head of the axe-shaped pen tip nylon pressing block (6) is used to push the wool material (4) point by point along the arc root of the wool material (4), and after repeated several times, a rubber hitting board and a bakelite hammer are used to correct the wool material (4) so ​​that it is close to the processing mold.

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