Method of cutting metals and machined blank

FIELD: process engineering.

SUBSTANCE: set of inventions relates to metal cutting. Proposed method comprises gluing protective film 4, 9 with preset elongation at fracture on, at least, one surface 2 to be machined at preset adhesion force. Locating cutting tool 3 at preset position relative to said surface 2. Applying preset mechanical force to said tool 3 for preset time interval for cutting said workpiece 1. Lifting said tool 3 from said, at least, one machined surface 2 after said preset time interval. Protective film 9 features elongation of 80-120% while force of adhesion between said film 9 and machined surface 2 makes, in fact, 10 N/25 mm.

EFFECT: better protection.

11 cl, 3 dwg

 

The present invention relates to a method of metal cutting and, more particularly, to a method of protecting surfaces during processing, and also to the corresponding workpiece according to claim 1 and claim 4 of the formula of the invention, respectively.

The level of technology

During the cutting surfaces of metals, these surfaces are often covered adhesive film to protect the surface from the effects of foreign bodies, i.e. from damaging tool or waste processing, and this film must be removed again after completing the processing of the given surface. Such film coated with adhesive, and is also used to protect the surface during transportation of the parts with a large surface area, such as surface high-quality sheet steel or lacquered new cars. Such films can be made of various materials. In particular, such films made of polyolefins, i.e. polyethylene (PE) or polypropylene (PP). Polyolefins have an elongation at rupture of more than 200%.

The protective film of this type is also used in aircraft construction throughout the manufacturing process structures of the aircraft, to prevent damage to the shell plating of the hull during machining. Such processes m is honourable applies, in particular, the drilling of the outer casing for the installation of connection elements.

The above protective film available on the market have, however, the disadvantage that when drilling, for example, the outer skin of the aircraft, the film is separated from the casing and becomes free in the area of the outer skin around the holes, so that between this film and the outer skin of the aircraft can be formed cavity type canopy. The transition region from the area of the protective film lying directly on the casing, a section of the protective film is separated from the cladding is diluted so precisely delineated boundary line between the two areas does not exist. When the film is separated from the surface, its protective effect around the edges of the holes becomes limited or completely lost. Moreover, spin-off film can get into the channels of the drill and thereby to prevent the advancement of the drill forward. Precision drilling then becomes impossible, or possible only under certain restrictions. Waste of this kind can also stay at separation film so that they are clamped between the part and the connecting element used to connect the two parts, which can lead to unstable connection.

Disclosure of inventions

The purpose of the crust is asego of the invention is to provide a method for metal cutting, whereby the workpiece protect from damage waste machining without compromising the efficiency of drilling. Moreover, should also be established machined billet.

This is achieved by the method of metal cutting according to claim 1 of the claims and preform according to claim 4 claims. Preferred variants of the present invention constitute the subject-matter of the respective dependent claims.

The present invention is based on the fact that the film be put on the machining surface having a lower relative elongation at break. To ensure optimum adhesion between the film and the surface, this film is covered with glue, which on one hand provides sufficient adhesion, and on the other hand can be easily removed with the given surface after machining. Adhesion of the film to the surface and the elongation of the film at the gap should be, thus, optimally coordinated with one another.

Method of metal cutting according to the present invention for processing a workpiece of a given shape, at least one machined surface, containing the steps of sticking a protective film with a given about the relative elongation at break of indicated, at least one processed surface with a preset force of adhesion of the cast cutting tool at a desired position above the specified machined surfaces, application to the instrument specified mechanical force in a given direction in the continuation of a specified amount of time for processing metal workpieces by cutting and lifting of the specified tool from the specified at least one treated surface after this specified period of time, characterized in that the bonding between the protective film and machined surface occurs adhesion strength value essentially 10 N/25 mm, and used the protective film has an elongation at break within 80-120%.

In particular, the considered method has in the preferred embodiment, as an additional stage or, where this is technically possible and appropriate, as additional stages are the following:

- on the specified at least one machined surface creates a priming layer to which paste protective film, and

- this method has at least one drilling operation using a drill.

Accordingly, according to the present invention proposed zag the training, having a defined shape, at least one machined surface for processing using the method of metal cutting, containing the steps of bringing the cutting tool at a desired position above the specified at least one machined surface of the Annex to the instrument specified mechanical efforts in the continuation of a specified amount of time in a specified direction for the treatment of metal workpieces by cutting and lifting of the specified tool from the specified at least one treated surface after this specified time period where the specified workpiece contains a protective film on the specified at least one machined surface pasted with a preset force of adhesion, and differs between the protective film and the machined surface of the workpiece, there is the adhesion force value essentially 10 N/25 mm, and used the protective film has an elongation at break in the range of 80-120%.

More specifically, this preparation has in the preferred embodiment, as an additional sign or, where this is technically possible and appropriate, as an additional indication of the following:

- protective film has the the woman 100 microns;

- protective film made of polyethylene terephthalate (PET);

- protective film coated with acrylate dispersion adhesive;

- the thickness of the adhesive layer is 25 μm, and

between the specified at least one machined surface and a layer of acrylate dispersion adhesive created a priming coat.

The present invention has inter alia the following advantages. Due to their small relative elongation of the film material in the gap is cutting the film at the time of drilling by the drill. When the reamer holes is similar reamer film. This enables you to use when on the processed surface of the deposited film, the connecting element with countersunk head without the film hit between this item and countersunk. Adhesiveness (adhesion strength) of the film on the protected surface sufficient to prevent separation of the film from the surface in the area around the hole, but on the other hand it is small enough you could remove the film from the surface of a large area, i.e. without rupture and without the use of auxiliary tools or devices.

Brief description of drawings

Other advantages and features of the present invention are evident from the following description of options with Ref the AMI to the accompanying drawings.

Figure 1 shows the cross section of the workpiece with a protective film in accordance with known methods.

Figure 2 shows the cross section of the first variant of the workpiece according to the present invention with a film of polyethylene terephthalate (PET) according to the present invention.

Figure 3 shows the cross section of the second variant of the workpiece according to the present invention with a film of polyethylene terephthalate (PET) according to the present invention.

The drawings shown are not to scale. The same or similarly acting elements have the same digital positional notation.

The implementation of the invention

Further, the term "cutting" means the machining of the workpiece geometrically specific or non-specific cutting tool, in particular a drilling deaf or through holes in the part.

Figure 1 shows the cross section of the workpiece 1. In the surface 2 of the workpiece 1 must be drilled the hole cutting tool 3, here is the drill. To prevent damage to the surface 2 chips on this surface 2 according to the known methods paste protective film 4. Before you begin to be protected surface 3 paste film 4 without holes, and then drill holes and install fasteners film does not allow the impact of foreign bodies and objects n is the considered surface 2 (the outer wall). For this purpose between the specified surface 2 and a protective film 4 created layer 5 of adhesive, non-slip film 4 on the surface 2 during machining surface 2 tool 3.

Next, place the drill bit 3 to a predetermined position above the surface 2 and lower on the surface 2. The drill breaks through the protective film 4 and the layer 5 of adhesive to penetrate into the surface 2. After that, within a specified period of time to drill 3 apply a mechanical force in a given direction. In this way create, for example, the hole 6 in the base 1 and, if necessary, perform the countersunk region 7 in the surface 2. At the end of machining, i.e. after a preselected period of time, the drill 3 rise from the machined surface 2 and move to the next point for machining (not shown). A new point is described procedure is repeated.

Upon completion of all such operations of machining on the surface 2 a protective film 4 together with the adhesive layer 5 is removed from the surface 2, without leaving any waste, so that the workpiece 1 is ready for further machining other means (not shown) or ready for installation in a larger Assembly (not shown).

According to the known methods of the protective film can be made of various materials,and more specifically polyolefins, for example polyethylene (PE) or polypropylene (PP). Polyolefins have an elongation at rupture of more than 200%. Therefore, it may happen that when drilling the film 4 is separated from the machined surface 2 in the area around the hole, and between the film 4 and the surface 2 is formed cavity type canopy. In the film 4 can before separation to perform in the opening 6, 7 for a considerable distance in some places. As a consequence, near the hole 6, 7 can be waste 8 film 4 in the form of patches. These patchwork waste 8 represent pieces of film winded on the drill 3 in rotation and coming off only when the relative elongation at break. These patchwork waste largely preserve their length, into the channels of the drill 3 and clog the channels. The transition from the protective film 4, remaining away from the opening 6, separated from the surface portions of the protective film in the immediate vicinity of the hole 6 is blurred without any clear boundary between these two areas. When the protective film is separated from the surface, its protective effect on the area around the edge of the hole is limited or even completely lost. Moreover, due to the presence of material in the channels of the drill 3 advancing the drill 3 to make the units in the direction of the workpiece is difficult so precision drilling becomes more impossible or possible only to a limited extent. Finally, the result of the presence of the remaining waste film into the drilled hole 6 with countersunk region 7 anymore until the film on the surface, insert the connecting element (not shown) with countersunk head, without removing the film 4, since otherwise the remaining waste 8 film loop between the part (preparation 1) and countersunk screws (not shown). This will lead to instability of the connection.

Because the aircraft precision holes throughout the manufacturing process designs especially important, and reliability requirements of the compounds is extremely high, it is important to avoid such interference.

Therefore, when machining the surface 2 as described above, it is very important that the force of adhesion of the protective film 4 to the surface 2 and the elongation of the protective film 4 at break were consistent with each other. During the tests, which were also conducted in different climatic conditions, the authors found that the optimal are the adhesion force of the adhesive between the protective film and the machined surface, comprising essentially a 10 N/25 mm, in combination with a relative elongation of the protective film at break in the range of 80-120%.

Thus, according to the but the present invention used film 9 made of polyethylene terephthalate (PET), having elongation at break of 80-120% instead of more than 200%, as in the case of polyolefins. Adhesive layer 5 of adhesive between the film 9 and the surface 2 is fixed at approximately 10 N/25 mm As shown in figure 2, for such values of waste 8 film is no longer formed, and the drill meets more resistance when moving around its axis or move forward. These values can be, in particular, achieved preferably by using acrylate dispersion adhesive as a material of the layer 10 of adhesive between the film 9 and machined surface 2. Moreover, the desired properties of the film 9 to be strengthened, if the film has a thickness of 100 μm, and the thickness of the adhesive layer 10 according to the present invention is 25 microns.

Moreover, in the cutting of the film according to the present invention with the adhesive according to the present invention can be used connecting element with countersunk in the presence of a surface film without film struck between detail and countersunk.

Figure 3 shows a variant of the workpiece according to the present invention, in which for better control of the strength of adhesion of the film 9 to the surface 2 on this surface 2 is applied primer layer 11 before bonding film 9 by means of a layer 5 of adhesive.

So the second method allows you to more accurately set the level of adhesion between these layers. In particular, as the material of the primer for this purpose is a material Seevenax 113-22 (trade mark).

1. Method of metal cutting for processing a workpiece (1) a given shape with at least one machined surface (2), which contains the steps of: bonding a protective film (4, 9) with a given elongation at break on at least one machined surface (2) with a given force of adhesion, bringing the cutting tool (3) to a predetermined position above the machined surface (2), Supplement to the tool (3) given the mechanical force in a given direction in the continuation of a specified amount of time for processing a metal workpiece (1) cutting and lifting tool (3) from at least one machined surface (2) after a specified period of time, wherein using a protective film (9), having an elongation at break in the range of 80-120%, and the bonding between the protective film (9) and machined surface (2) occurs the adhesion force value, essentially 10 N/25 mm

2. The method according to claim 1, characterized in that at least one machined surface (2) created a primer layer (11), the cat is who paste protective film (9).

3. The method according to claim 1, wherein implementing at least one drilling operation using a drill.

4. The workpiece (1) a given shape with at least one machined surface (2) for metal cutting, the workpiece (1) contains a protective film (4, 9) on at least one machined surface (2), pasted with a preset force of adhesion, characterized in that the protective film (9) has an elongation at break in the range of 80-120%, and the force of adhesion between the protective film (9) and machined surface (2) of the workpiece is essentially 10 N/25 mm

5. The workpiece according to claim 4, characterized in that the protective film (9) has a thickness of 100 μm.

6. The workpiece according to claim 4, characterized in that the protective film (9) is made of polyethylene terephthalate (PET).

7. The workpiece according to claim 5, characterized in that the protective film (9) is made of polyethylene terephthalate (PET).

8. Stocking one of claims 4 to 7, characterized in that the protective film (9) is covered with a layer (10) acrylate dispersion adhesive.

9. The workpiece of claim 8, characterized in that the layer (10) of the adhesive has a thickness of 25 μm.

10. The workpiece of claim 8, characterized in that between at least one machined surface (2) and a layer of acrylate dispersion adhesive created GRU is ovocny layer (11).

11. The workpiece according to claim 9, characterized in that between at least one machined surface (2) and a layer of acrylate dispersion adhesive created a primer layer (11).



 

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