CN111774812A - Skin forming and milling positioning method and device - Google Patents
Skin forming and milling positioning method and device Download PDFInfo
- Publication number
- CN111774812A CN111774812A CN202010535738.3A CN202010535738A CN111774812A CN 111774812 A CN111774812 A CN 111774812A CN 202010535738 A CN202010535738 A CN 202010535738A CN 111774812 A CN111774812 A CN 111774812A
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- sample plate
- chemical milling
- milling
- chemical
- skin
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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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- 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
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
Abstract
The invention belongs to the technical field of process equipment, and discloses a skin forming and milling positioning method and device, aiming at solving the manufacturing problem of a chemical milling skin part inspection tooling chemical milling sample plate in the manufacturing process of a milling skin part. The device has solved the problem that chemical milling covering can't be inspected. The process method for reducing the weight of the skin is optimized. And a good guarantee is provided for the weight reduction of the skin. And the technological parameters and the design points of the tool of the milling device are standardized, and a unified standard is formed.
Description
Technical Field
The invention belongs to the technical field of process equipment, relates to application of a positioning device adopted in skin forming and milling on a forming tool, and particularly relates to a skin forming and milling positioning method and device.
Background
In aircraft parts, a large number of skin-like parts are used. Some sheet metal skin parts have larger sizes and larger skin thicknesses. The theoretical weight for a 7000mm by 1600mm by 3.175mm skin is 120Kg, but the installed product cannot be so heavy, requiring a lightening of 46.2 Kg. In order to reduce the weight, the weight is reduced by milling the thickness of the skin. The part with the thinnest skin thickness after milling is only 1.8 mm.
The skin part is generally in the shape of an airplane, so the shape of the part is curved, and the part can be machined only by a forming tool. A stretching mould tire for forming the skin part is designed to form the appearance of the skin part, and the stretching mould tire is a convex tire. And manually trimming the contour of the skin part after the skin contour is formed. And after finishing trimming, chemically milling the skin part, thereby achieving the purpose of lightening the part. But the chemical milling area is arranged on the inner profile of the skin part and is tightly attached to the profile of the stretching die. Whether the contour line of the chemical milling area is qualified or not needs a check basis. A chemical milling sample plate is designed, the appearance of the sample plate is attached to the inner shape of a skin part, and the sample plate is of a convex shape. And (4) inspecting whether the contour line of the chemically-milled skin chemically-milled area is qualified or not by using the chemically-milled sample plate. The chemical milling sample plate is 2mm thick and is made of steel plate. In order to form the chemical milling sample plate, a stretching mold is designed, the mold is a convex mold, and the shape of the mold is 2mm different from that of a skin stretching mold. Firstly, forming the chemical milling sample plate on a special stretching mould for the chemical milling sample plate. And after the forming is finished, manually trimming until the contour is consistent with the contour of the chemical milling template. And manufacturing a positioning hole, wherein the positioning hole is used for positioning the formed chemical milling skin on the forming mould, and then mounting the chemical milling sample plate stretching mould and the chemical milling sample plate on a numerical control machine together for processing the chemical milling sample plate, so as to process all the shapes needing chemical milling. The method is used for detecting the chemically milled skin. However, the chemical milling skin mould and the machine tool can be fixed, and the chemical milling skin and the tyre body are in surface contact and cannot be fixed.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for skin forming and milling positioning, wherein a set of fixed milling sample plate and a set of die mould are designed for manufacturing the milling sample plate.
The technical scheme of the invention is as follows: a skin forming and milling positioning method comprises the following steps:
firstly, manufacturing a group of positioning holes on a special stretching die for a chemical milling sample plate; the group of positioning holes are used for positioning the chemical milling sample plate after molding on the molding die;
step two, forming the chemical milling sample plate on a special stretching mould for the chemical milling sample plate;
step three, after the chemical milling sample plate is formed, manually trimming until the profile is consistent with the theoretical profile of the chemical milling sample plate, and then manufacturing a positioning hole of the chemical milling sample plate on the chemical milling sample plate according to the positioning hole of the special stretching mould; and the chemical milling sample plate positioning hole is used for positioning the formed chemical milling skin on the forming die tire.
Fixing the chemical milling sample plate on the special stretching die tire for the chemical milling sample plate by utilizing the positioning hole of the special stretching die tire and the positioning hole of the chemical milling sample plate through a bolt; the accurate position of the chemical milling sample plate on the molding die is ensured, and the chemical milling sample plate is not staggered;
mounting skin forming and milling positioning devices along the length direction on two sides of the stretching die tire special for the chemical milling sample plate, wherein the skin forming and milling positioning devices are two tensioning devices, a bandage with adjustable length is fixed on the two tensioning devices, and the bandage with adjustable length compresses the chemical milling sample plate, so that the chemical milling sample plate is fixed on the stretching die tire special for the chemical milling sample plate;
step six, mounting the stretching die tire of the chemical milling sample plate and the chemical milling sample plate on a numerical control machine tool together to process the chemical milling sample plate, and processing all the appearances needing chemical milling; the chemical milling sample plate is used for detecting the chemical milling skin.
Furthermore, in the fifth step, when the chemical milling sample plate is tightly pressed on the special stretching die tire by the bandage with adjustable length, the chemical milling sample plate is ensured to be completely attached to the molded surface of the special stretching die tire.
Further, in the fifth step, the bandage with the adjustable length is tensioned through a ratchet wheel pre-tightening device. The ratchet wheel pre-tightening device is arranged in the middle of the bandage with adjustable length, and after the two ends of the bandage are connected with the tensioning devices on the two sides, the ratchet wheel pre-tightening device is controlled to shorten the length of the bandage, so that the length of the bandage is adjusted.
Furthermore, a plurality of bandages with adjustable lengths are adopted to press the chemical milling sample plate on the special stretching mould, and the installation positions of the plurality of bandages with adjustable lengths are determined according to the molded surface of the chemical milling sample plate. Due to the inconsistency of curvature change, the positions of the bandages arranged equidistantly or regularly can make the fitting effect poor, and therefore the bandage layout with the length adjustable at multiple points is adopted.
The skin forming and milling positioning device comprises a mounting base, pull rods and a bandage with adjustable length, wherein the mounting base is mounted on a special stretching die tire, through holes are formed in the mounting base, the pull rods penetrate through a plurality of mounting bases to be fixedly hung on the special stretching die tire, and hooks are arranged at two ends of the bandage with adjustable length and are matched with the pull rods.
Furthermore, the pull rod is formed by splicing a plurality of short pull rods through butt nuts.
Furthermore, the short pull rods have five specifications of 1m, 2m, 0.5m, 0.2m and 0.1m respectively. The five specifications of short tie rods can form the length of the tie rods required by all skin forming methods.
Furthermore, a ratchet wheel pre-tightening device is arranged on the bandage with adjustable length.
The invention has the advantages that:
1. a chemical milling sample plate forming mold is designed by adopting a three-dimensional technology, a polyurethane material is adopted for a mold surface of the mold, and numerical control processing is adopted. The forming quality is ensured, and the problems of poor forming effect of the skin and difficulty in ensuring the pneumatic appearance are solved by using the skin stretch forming process.
2. The fixing device solves the problems that the milling of the chemical milling sample plate is difficult to position and the processing quality can not be ensured. The problem of aircraft part need guarantee intensity still can subtract heavy is solved.
3. The structure of the invention can also be applied to the manufacture of such special parts for civil use.
Drawings
FIG. 1 is a schematic diagram of a chemical milling template;
FIG. 2 is a schematic view of the working state of the chemical milling template on the molding die of the chemical milling template;
FIG. 3 is an enlarged schematic view of the present milling apparatus;
FIG. 4 is a schematic view of a mounting bracket;
FIG. 5 is a schematic view of a pull rod;
fig. 6 is a schematic view of a docking nut.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
A skin forming and milling positioning method comprises the following steps:
firstly, manufacturing a group of positioning holes on a special stretching die for a chemical milling sample plate; the group of positioning holes are used for positioning the chemical milling sample plate after molding on the molding die;
step two, forming the chemical milling sample plate on a special stretching mould for the chemical milling sample plate;
step three, after the chemical milling sample plate is formed, manually trimming until the profile is consistent with the theoretical profile of the chemical milling sample plate, and then manufacturing a positioning hole of the chemical milling sample plate on the chemical milling sample plate according to the positioning hole of the special stretching mould; and the chemical milling sample plate positioning hole is used for positioning the formed chemical milling skin on the forming die tire.
Fixing the chemical milling sample plate on the special stretching die tire for the chemical milling sample plate by utilizing the positioning hole of the special stretching die tire and the positioning hole of the chemical milling sample plate through a bolt; the accurate position of the chemical milling sample plate on the molding die is ensured, and the chemical milling sample plate is not staggered;
mounting skin forming and milling positioning devices along the length direction on two sides of the stretching die tire special for the chemical milling sample plate, wherein the skin forming and milling positioning devices are two tensioning devices, a bandage with adjustable length is fixed on the two tensioning devices, and the bandage with adjustable length compresses the chemical milling sample plate, so that the chemical milling sample plate is fixed on the stretching die tire special for the chemical milling sample plate;
step six, mounting the stretching die tire of the chemical milling sample plate and the chemical milling sample plate on a numerical control machine tool together to process the chemical milling sample plate, and processing all the appearances needing chemical milling; the chemical milling sample plate is used for detecting the chemical milling skin.
The key point of the invention is that in the step five, the following places need to be noticed specifically: when the bandage with adjustable length compresses the chemical milling sample plate on the special stretching mould, the chemical milling sample plate is ensured to be completely attached to the molded surface of the special stretching mould; tightening the bandage by a ratchet wheel pre-tightening device; and a plurality of bandages with adjustable lengths are adopted to press the chemical milling sample plate on the special stretching mould, and the installation positions of the plurality of bandages with adjustable lengths are determined according to the molded surface of the chemical milling sample plate. Due to the inconsistency of curvature change, the positions of the bandages arranged equidistantly or regularly can make the fitting effect poor, and therefore the bandage layout with the length adjustable at multiple points is adopted.
The skin forming and milling positioning device comprises a mounting base, pull rods and a bandage with adjustable length, wherein the mounting base is mounted on a special stretching die tire, through holes are formed in the mounting base, the pull rods penetrate through a plurality of mounting bases to be fixedly hung on the special stretching die tire, and hooks are arranged at two ends of the bandage with adjustable length and are matched with the pull rods.
The pull rod is formed by splicing a plurality of short pull rods through butt nuts, and the short pull rods are respectively provided with five specifications of 1m, 2m, 0.5m, 0.2m and 0.1 m.
The bandage with adjustable length is provided with a ratchet wheel pre-tightening device.
Another embodiment of the present invention is described below with reference to the drawings.
The milling device is used on a special stretching die for a chemical milling sample plate. The special stretching mould for the chemical milling sample plate is a chemical milling skin inner type. Firstly, forming the chemical milling sample plate on a special stretching mould for the chemical milling sample plate. And after the forming is finished, manually trimming until the contour is consistent with the contour of the chemical milling template. And manufacturing a positioning hole, wherein the positioning hole is used for positioning the formed chemical milling skin on a stretching mould special for the chemical milling sample plate, and then mounting the stretching mould special for the chemical milling sample plate and the chemical milling sample plate on a numerical control machine together for processing the chemical milling sample plate, so that all the appearances needing chemical milling are processed. The method is used for detecting the chemically milled skin. The molded surface of the stretching mold base special for the chemical milling sample plate is made of polyurethane material, and a chemical milling skin positioning hole is formed in the molded surface along the normal direction of the molded surface at the position of 10mm of the chemical milling skin contour line. The hole is used for positioning the chemically milled skin on the forming mould after forming. And (4) positioning the chemically milled skin through the pins and normal holes manufactured on the forming die.
The positioning only ensures that the chemical milling skin is accurate in position on the forming die tire and has no phenomena of position crosstalk and the like. However, the chemical milling template and the chemical milling template forming die need to be fixed for milling. The method has the advantages that the molding surfaces of the chemical milling sample plate and the special stretching die for the chemical milling sample plate are completely attached, and the chemical milling sample plate is prevented from moving in the machining process. In order to meet the purpose, tensioning devices are arranged on two sides of a special stretching die tire of the chemical milling template along the length direction. And fixing the chemical milling template on the chemical milling template molding die by a bandage with adjustable length. And then processing the chemical milling template through a machine tool. The length of the bandage is 2.8 meters, the two ends of the bandage are provided with hooks, the bandage is connected by adopting a ratchet wheel tightening device, and the bandage is tightened by the ratchet wheel tightening device, so that the aim of fixing the chemical milling template and the chemical milling template forming mold is fulfilled. Because the length of the chemical milling sample plate reaches 7 meters, the chemical milling sample plate and the special stretching mould for the chemical milling sample plate are fixed, and all molded surfaces are completely attached, and the required effect can be achieved only by arranging bandages at multiple points.
Because the chemical milling sample plate and the stretching die tire special for the chemical milling sample plate are both provided with curved profiles, the milling accuracy is ensured in order to ensure the complete fit of the profiles. Multiple points of bandage are required to achieve the desired effect, however, due to the non-uniformity of curvature variation, it is not possible to arrange the position of the bandage equidistantly or regularly. In order to solve the problem, bandage fixing devices are arranged on two sides of a stretching die tire special for a chemical milling template along the length direction. The device consists of a support, a pull rod with the diameter phi 34 and a butt nut. The support is a machined part and is connected to the tire body through a screw, and a through hole with the diameter phi of 36 is formed in the support. The pull rod is made of a 0Cr18Ni9Ti steel bar with the diameter phi of 34 and consists of four specifications of 1m, 2m, 0.5m, 0.2m and 0.1 m. The end of each draw rod is provided with a screw thread with the length of M30 being 50 mm. The butt joint nut is made of No. 45 steel, is in a 40X40 hexagonal shape, and is provided with an M30 inner hole in the center.
The fixing device is in a splicing shape, and can be combined into fixing devices with different lengths for molding and milling according to chemical milling sample plates with different lengths. For example, a 7m long milling template can be formed by connecting three 2m and 1m pull rods with a 7m long pull rod through a butt nut. If the length of the sample plate is 5.3m, the sample plate is chemically milled. Two pull rods of 2m and 1 pull rod of 1m, and one pull rod of 0.2m and one pull rod of 0.1m can be connected into a pull rod of 5.3m in length through butt nuts. The combined method solves the problem of diversified lengths of the chemical milling sample plates.
Claims (8)
1. A skin forming and milling positioning method is characterized by comprising the following steps:
firstly, manufacturing a group of positioning holes on a special stretching die for a chemical milling sample plate;
step two, forming the chemical milling sample plate on a special stretching mould for the chemical milling sample plate;
step three, after the chemical milling sample plate is formed, manually trimming until the profile is consistent with the theoretical profile of the chemical milling sample plate, and then manufacturing a positioning hole of the chemical milling sample plate on the chemical milling sample plate according to the positioning hole of the special stretching mould;
fixing the chemical milling sample plate on the special stretching die tire for the chemical milling sample plate by utilizing the positioning hole of the special stretching die tire and the positioning hole of the chemical milling sample plate through a bolt;
mounting skin forming and milling positioning devices along the length direction on two sides of the stretching die tire special for the chemical milling sample plate, wherein the skin forming and milling positioning devices are two tensioning devices, a bandage with adjustable length is fixed on the two tensioning devices, and the bandage with adjustable length compresses the chemical milling sample plate, so that the chemical milling sample plate is fixed on the stretching die tire special for the chemical milling sample plate;
and step six, mounting the stretching die tire of the chemical milling sample plate and the chemical milling sample plate on a numerical control machine together to process the chemical milling sample plate, and processing all the appearances needing chemical milling.
2. The skin forming and milling positioning method as claimed in claim 1, wherein in the fifth step, the length-adjustable bandage presses the chemical milling template against the dedicated stretch mold to ensure that the chemical milling template and the profile of the dedicated stretch mold are completely fitted.
3. The skin forming and milling positioning method as claimed in claim 2, wherein in step five, the bandage is tensioned by a ratchet pre-tightening device.
4. The skin forming and milling positioning method as claimed in claim 3, wherein the chemical milling template is pressed on the special stretching mold by a plurality of adjustable length bandages, and the installation positions of the plurality of adjustable length bandages are determined according to the molded surface of the chemical milling template.
5. A skin forming and milling positioning device is used in the skin forming and milling positioning method of claim 1, and comprises mounting bases, pull rods and length-adjustable bandages, wherein the mounting bases are mounted on special stretching die tires, through holes are formed in the mounting bases, the pull rods penetrate through the mounting bases so as to be suspended and fixed on the special stretching die tires, hooks are arranged at two ends of each length-adjustable bandage, and the hooks are matched with the pull rods.
6. The skin forming and milling positioning device as claimed in claim 5, wherein the tie rods are formed by splicing a plurality of short tie rods through butt nuts.
7. The skin forming and milling positioning device as claimed in claim 6, wherein the plurality of short tie rods have five specifications of 1m, 2m, 0.5m, 0.2m and 0.1m, respectively.
8. The skin forming and milling positioning device as claimed in claim 5, wherein the adjustable length bandage is provided with a ratchet pretensioning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535738.3A CN111774812B (en) | 2020-06-12 | 2020-06-12 | Skin forming and milling positioning method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535738.3A CN111774812B (en) | 2020-06-12 | 2020-06-12 | Skin forming and milling positioning method and device |
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| Publication Number | Publication Date |
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| CN111774812A true CN111774812A (en) | 2020-10-16 |
| CN111774812B CN111774812B (en) | 2022-05-27 |
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| CN202010535738.3A Active CN111774812B (en) | 2020-06-12 | 2020-06-12 | Skin forming and milling positioning method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799771A (en) * | 2022-06-01 | 2022-07-29 | 沈阳飞机工业（集团）有限公司 | Accurate manufacturing method of bow-shaped aluminum alloy part |
| CN115502663A (en) * | 2022-09-26 | 2022-12-23 | 沈阳飞机工业（集团）有限公司 | Preparation method of large-scale fork-shaped skin contour |
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| CN111774812B (en) | 2022-05-27 |
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