CN112371846B - Multifunctional skin stretch-forming die and stretch-forming method - Google Patents
Multifunctional skin stretch-forming die and stretch-forming method Download PDFInfo
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- CN112371846B CN112371846B CN202011141850.5A CN202011141850A CN112371846B CN 112371846 B CN112371846 B CN 112371846B CN 202011141850 A CN202011141850 A CN 202011141850A CN 112371846 B CN112371846 B CN 112371846B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a multifunctional skin stretch-forming die and a stretch-forming method, wherein the skin stretch-forming die comprises a die profile, a supporting structure, a base and a scribed line, the scribed line is positioned on the die profile and is divided into a first scribed line and a second scribed line, the first scribed line and the second scribed line have the same reference, the second scribed line is positioned inside the first scribed line, the first scribed line is a contour line corresponding to the maximum solid appearance of a part, and the second scribed line is a contour line corresponding to the minimum solid appearance of the part. When the part is drawn, the part is drawn through the molded surface of the die, cut through the second scribed line and subjected to appearance detection through the first scribed line and the second scribed line. The skin stretch-forming die provided by the invention has the functions of a stretch-forming die, a trimming clamp and a detection type tire, and the stretch-forming method adopting the die can greatly reduce the tooling cost of product development, shorten the processing period and improve the processing quality and efficiency.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a multifunctional skin stretch-forming die and a stretch-forming method adopting the die.
Background
The skin member is a part which forms the appearance of the airplane and requires good aerodynamic performance, and has the characteristics of large appearance size, high profile precision, thin thickness and low rigidity.
The skin is generally designed by adopting a three-dimensional curved surface, the reference of appearance, processing and detection is the center or the axis of the curved surface outside a part entity, and in addition, the characteristic of low rigidity of the part is adopted, and special tools are needed for positioning and supporting the appearance processing and the appearance detection of the skin. Therefore, the skin processing tool generally comprises a stretch-forming die, a trimming clamp and a detection type tire, and due to the large overall dimension, the tool cost required by processing is high, the period is long, and the occupied space is large, so that a multifunctional tool design scheme and a matched stretch-forming method are urgently needed to be sought, the development cost is reduced, and the efficiency is improved.
Disclosure of Invention
The invention aims to provide a design scheme of a multifunctional skin stretch-forming die with functions of forming, trimming and detecting, and further provides a skin stretch-forming method, so that a set of tool can play three functions of the forming die, a trimming clamp and a detection measuring tool, the tool cost of product development is greatly reduced, the forming and detecting efficiency is improved, and the processing period is shortened.
A multifunctional skin stretch-forming die, which comprises a die molded surface, a supporting structure, a base and a die core,
and the scribed lines are positioned on the mold surface and are divided into a first scribed line and a second scribed line, the first scribed line and the second scribed line have the same reference, the second scribed line is positioned inside the first scribed line, the first scribed line is a contour line corresponding to the maximum solid appearance of the part, and the second scribed line is a contour line corresponding to the minimum solid appearance of the part.
Preferably, the molded surface of the mold is consistent with the theoretical molded surface of the part, the contour line corresponding to the maximum entity shape of the part is used as a reference for the contour dimension of the molded surface of the mold, the special-shaped edge is completed, the cutting allowance of the mold surface is added to obtain the final contour dimension of the molded surface of the mold, and the final contour dimension is a regular straight-edge structure.
Preferably, the supporting structure is a hollow structure with supporting columns, one end of each supporting column is connected with the lower end of the molded surface of the mold, and the other end of each supporting column is connected with the base.
Preferably, the base is a thick plate, and the side surface of the thick plate is connected with a hoisting hanging lug.
The skin stretch forming method adopting the multifunctional skin stretch forming die comprises the following steps,
firstly, a skin stretch-forming die is installed on a skin stretch-forming machine, a marking robot carried by the skin stretch-forming machine is used for programming reversely along a first marking line on the molded surface of the die, and a program is stored;
secondly, drawing the part;
step three, unloading the pulling force after the stretch forming is finished, pulling two sides of the part by extremely small pulling force, and attaching the molded surface of the stretch forming die to the greatest extent on the premise that the part does not generate plastic deformation;
step four, scribing lines on the surface of the part according to the program stored by the scribing robot in the step one;
step five, cutting the part shape according to the scribed lines on the skin part shape in the step four;
step six, correcting the appearance of the part in the step five;
and step seven, mounting the part on the stretch-forming die again, checking the shape of the part through the first scribing line and the second scribing line, and when the shape of the part is positioned between the first scribing line and the second scribing line, the shape of the part is qualified.
Preferably, in the fifth step, a vibration shear is used for trimming according to a line or a laser cutting is used for cutting according to a line.
Preferably, in the sixth step, the part shape correction includes removing burrs on the part shape.
The skin stretch forming method adopting the multifunctional skin stretch forming die comprises the following steps,
firstly, a skin stretch-forming die is installed on a skin stretch-forming machine, a marking robot carried by the skin stretch-forming machine is used for programming reversely along a first marking line on the molded surface of the die, and a program is stored;
secondly, drawing the part;
thirdly, detaching the part and the die after the stretch forming is finished, mounting the stretch forming die on a laser cutting machine platform, reversely programming along a first scribed line on the molded surface of the die by using the laser cutting machine, and storing the program;
clamping the skin part on a stretch-forming die, pressing the surface of the part by using a magnet, and carrying out low-power ablation scribing on the surface of the part according to the program stored by the laser cutting machine in the step three;
step five, cutting the appearance according to the scribed line programming on the appearance of the skin part in the step four;
step six, correcting the appearance of the part in the step five;
and step seven, the part is installed on the stretch-forming die again, the appearance of the part is checked through the first scribing line and the second scribing line, and the appearance of the part is qualified when the appearance of the part is located between the first scribing line and the second scribing line.
Compared with the prior art, the die design scheme provided by the invention has the functions of a stretch-forming die, a trimming clamp and a detection type tire, and greatly reduces the tooling cost of product development. The part stretch forming method using the skin stretch forming clamp has high efficiency, does not need to switch different trimming and detecting clamps, can complete all procedures on one set of skin stretch forming die, shortens the time period, avoids complex operation of reference change when switching on different clamps, and improves the processing quality.
Drawings
FIG. 1 is a schematic view of a skin stretch-forming die designed in accordance with the present invention;
FIG. 2 is an enlarged schematic view of the first score line and the second score line of FIG. 1 at detail A;
FIG. 3 is a schematic view of a final finished skin stretch-formed part;
FIG. 4 is a schematic flow chart of the skin stretch-forming method of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described herein is limited to the following embodiments, and various modifications, substitutions and alterations based on the common general knowledge and practice in the art without departing from the technical spirit of the present invention are included in the scope of the present invention.
The skin stretch-forming die comprises a die profile 2, a supporting structure 3, a base 1 and a reticle 4, wherein the reticle 4 is divided into two reticles, one reticle is scribed on the surface of the die profile 2 according to the maximum part theoretical solid profile, and the other reticle is scribed on the surface of the die profile 2 according to the minimum part theoretical solid profile.
Specifically, the invention is realized by the following technical scheme:
1. as shown in fig. 1, the skin-stretching mold is composed of a mold surface 2, a support structure 3, and a base 1, wherein the mold surface 2 is provided with score lines 4, and the score lines 4 include a first score line 41 and a second score line 42.
2. As shown in fig. 1, the mold surface 2 is designed according to the theoretical surface of a part, the shape of the mold surface 2 is required according to the contour line of the maximum entity of the part, then the special-shaped edge (namely the special-shaped edge after the part is drawn) is completed, and the cutting allowance of the part surface is added, so that the shape edge contour of the mold surface 2 is designed into a regular straight-edge structure.
3. As shown in fig. 1, the supporting structure 3 is a hollow structure, and includes 3 supporting columns, so as to ensure the strength of the mold and maximally reduce the weight of the mold.
4. As shown in figure 1, the base 1 is designed in a thick plate type, and hoisting lugs 6 are additionally arranged on two sides.
5. As shown in fig. 2, the second score line 42 is scored on the mold surface at the smallest physical profile of the part, with a score line width of 0.2mm to 0.3mm and a depth of 0.2mm to 0.3 mm.
6. As shown in fig. 2, the first scribe line 41 is scribed on the mold surface in accordance with the maximum physical profile of the part, and has a scribe line width of 0.2mm to 0.3mm and a depth of 0.2mm to 0.3 mm.
As shown in fig. 3 and 4, the stretch-forming, trimming and inspecting method of the present invention has the following two ways:
scheme 1:
1) installing and fixing a stretch-forming die on a skin stretch-forming machine;
2) programming reversely by using a marking robot carried by a skin stretch-forming machine along the outer ring of the molded surface of the mold, and storing the program;
3) a stretch-forming part;
4) unloading tension after drawing is finished, pulling two sides of the part by extremely low tension, and sticking the die as much as possible on the premise that the part does not generate plastic deformation;
5) scribing lines on the surface of the part according to a program stored by a scribing robot;
6) cutting the appearance according to the scribed lines on the appearance of the skin part (generally, the skin part is trimmed according to lines by adopting vibration scissors or cut according to lines by adopting laser cutting);
7) correcting profile burrs or ablation;
8) and (3) mounting the part on a die, and checking the shape of the part by using the die scribed lines, wherein the edge of the shape of the part is between the two scribed lines of the die.
Scheme 2:
1) the steps are the same as the step 1, and the parts and the die are disassembled after the drawing is finished;
2) mounting the stretch-forming die to a laser cutting machine platform;
3) programming along the outer circle scribed line of the mold profile in the reverse direction by adopting a laser cutting machine, and storing the program;
4) clamping a skin part on a stretch-forming die, and pressing the surface of the part by using a magnet;
5) adopting low-power ablation scribing on the surface of the part according to a program stored by a laser cutting machine;
6) cutting the appearance according to the scribed line programming on the appearance of the skin part;
7) correcting profile burrs or ablation;
8) and (3) mounting the part on a die, and checking the shape of the part by using the die scribed lines, wherein the edge of the shape of the part is between the two scribed lines of the die.
Claims (7)
1. The skin stretch forming method is characterized in that: the method comprises the following steps that a multifunctional skin stretch-forming die is adopted, the die comprises a die profile, a supporting structure, a base and a scribed line, the scribed line is located on the die profile and is divided into a first scribed line and a second scribed line, the first scribed line and the second scribed line are identical in reference, the second scribed line is located inside the first scribed line, the first scribed line is a contour line corresponding to the maximum solid appearance of a part, and the second scribed line is a contour line corresponding to the minimum solid appearance of the part;
the stretch-forming method comprises the following steps,
firstly, a skin stretch-forming die is installed on a skin stretch-forming machine, a marking robot carried by the skin stretch-forming machine is used for programming reversely along a first marking line on the molded surface of the die, and a program is stored;
step two, drawing the part;
step three, unloading the pulling force after the stretch forming is finished, pulling two sides of the part by extremely small pulling force, and attaching the molded surface of the stretch forming die to the greatest extent on the premise that the part does not generate plastic deformation;
step four, scribing lines on the surface of the part according to the program stored by the scribing robot in the step one;
step five, cutting the part shape according to the scribed lines on the skin part shape in the step four;
step six, correcting the appearance of the part in the step five;
and step seven, mounting the part on the stretch-forming die again, checking the shape of the part through the first scribing line and the second scribing line, and when the shape of the part is positioned between the first scribing line and the second scribing line, the shape of the part is qualified.
2. The skin stretch-forming method of claim 1, wherein: and in the fifth step, trimming according to a line by adopting a vibration shear or cutting according to a line by adopting laser cutting.
3. The skin stretch-forming method of claim 1, wherein: and in the sixth step, the part appearance correction comprises the step of removing burrs on the part appearance.
4. The skin stretch forming method is characterized in that: the method comprises the following steps that a multifunctional skin stretch-forming die is adopted, the die comprises a die profile, a supporting structure, a base and a scribed line, the scribed line is located on the die profile and is divided into a first scribed line and a second scribed line, the first scribed line and the second scribed line are identical in reference, the second scribed line is located inside the first scribed line, the first scribed line is a contour line corresponding to the maximum solid appearance of a part, and the second scribed line is a contour line corresponding to the minimum solid appearance of the part;
the stretch-forming method comprises the following steps,
firstly, a skin stretch-forming die is installed on a skin stretch-forming machine, a marking robot carried by the skin stretch-forming machine is used for programming reversely along a first marking line on the molded surface of the die, and a program is stored;
secondly, drawing the part;
thirdly, detaching the part and the die after the stretch forming is finished, mounting the stretch forming die on a laser cutting machine platform, reversely programming along a first scribed line on the molded surface of the die by using the laser cutting machine, and storing the program;
clamping the skin part on a stretch-forming die, pressing the surface of the part by using a magnet, and carrying out low-power ablation scribing on the surface of the part according to the program stored by the laser cutting machine in the step three;
step five, cutting the appearance according to the scribed line programming on the appearance of the skin part in the step four;
step six, correcting the appearance of the part in the step five;
and step seven, mounting the part on the stretch-forming die again, checking the shape of the part through the first scribing line and the second scribing line, and when the shape of the part is positioned between the first scribing line and the second scribing line, the shape of the part is qualified.
5. The skin stretch-forming method according to claim 1 or 4, wherein: the mold surface is consistent with the theoretical mold surface of the part, the contour line corresponding to the maximum entity shape of the part is used as the reference for the contour dimension of the mold surface, the final contour dimension of the mold surface is obtained by adding the cutting allowance of the mold surface after the completion of the special-shaped edge, and the final contour dimension is a regular straight-edge structure.
6. The skin stretch-forming method of claim 1 or 4, wherein: the supporting structure is a hollow structure with supporting columns, one end of each supporting column is connected with the lower end of the molded surface of the mold, and the other end of each supporting column is connected with the base.
7. The skin stretch-forming method of claim 1 or 4, wherein: the base is a thick plate, and the side of the thick plate is connected with a hoisting lug.
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| CN202011141850.5A CN112371846B (en) | 2020-10-22 | 2020-10-22 | Multifunctional skin stretch-forming die and stretch-forming method |
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| CN202011141850.5A CN112371846B (en) | 2020-10-22 | 2020-10-22 | Multifunctional skin stretch-forming die and stretch-forming method |
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| CN112371846B true CN112371846B (en) | 2022-05-10 |
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| CN114193352A (en) * | 2021-11-19 | 2022-03-18 | 北京星航机电装备有限公司 | Elastic tensioning tool for weak-rigidity skin parts |
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