SI25120A - Wear stable welding plate - Google Patents

Abstract

The wear-resistant welding plate (1) solves the wear problem of the final layer (1.3) resulting from welding friction. It is intended for the heat-treating of thin strips of polymers (3.2) and aluminum alloys used for packaging products (4), in pharmaceutical and other industries. The surface (1.1) of the upper weld plate (1) is made with a pyramid-shaped engraving, defined by the dimensions of the angle of the pyramid (alpha), the dimensions of the pyramid head (a) and the median pyramid (b). The NiP layer (nickel) is applied to the welding surface (1.1) of the upper weld plate (1), and the end layer (1.3) is made of hard CrN (chromium nitride), which, due to wear resistance, extensively increases the lifetime of the upper weld plate (1) and in this way eliminates the change of the upper welding plates (1) due to wear. The upper welding plate (1) can also be attached to the elastic lining (5) on the guides of the welding machine, which adapts it to the surface of the lower weld plate (2).

Description

Wear-resistant welding plate

The subject of the invention is a technical system of extremely wear-resistant welding plate for contact rolling of polymers without the addition of welding materials.

The described technical system is intended to extend the life-time of the welding plate for the contact rolling of polymers.

A technical problem solved by the described technical system is the elimination of contact wear of the welding surface of the welding plate for contact welding of polymers.

It is a known state of the art so far that, in the pharmaceutical and other industries, contact welding machines used to roll product packaging weld two layers of polymer tape or, in most cases, a layer of polymer tape and a layer of aluminum foil tape. The first strip (polymer layer) can also be a combination, PVC-AL-PVC- thus a composite, and the second layer of tape is always aluminum foil. Between the straps, the products which are packed in this way and protected from external influences, such as: impurities, moisture, air pressure, etc., are welded in the socket of the lower strap.

These contact welding machines consist of an upper welding plate, a lower welding plate, a guide for moving the upper welding plate, transporting the lower and upper strap (both screws), a heating system for the upper welding plate, a system for stamping the upper welding plate through the two welders on the lower welding rod. plate.

The upper welding plates are made of aluminum or aluminum for heat transfer. aluminum alloys and the lower welding plates are made of steel.

The prior art is that both panels are made of aluminum or both of steel.

For better heat transfer to the weld, plates made of aluminum or aluminum alloy are used to a greater extent.

The plate pressures of both welding plates, during rolling, on the tapes of both welders are from 5 to 10 bar, and the temperature of the upper welding plate is from 150 to 250 degrees Celsius.

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The contours of both welding plates are generally made of t.i. pyramids, so that the tops of the pyramids of the upper welding plate are pressed, through both screws, into the pyramids of the lower welding plates. It is not necessary for the tops of the pyramids to be pressed exactly into the base of the pyramids, it is only important that the tops of the pyramids do not sit against each other, since in this case the surfaces of the pyramid engraving would be damaged.

The problems of such welding machines are that the welding surface-contour 1.1 of the upper welding plate 1, due to being heated to the working temperature of the welding, due to relatively high surface pressures and due to the insertion of the surface-contour of the pyramids 1.1, into the weld 3.1, is worn quite quickly and with this renders the joint of apprentices 3.1 and 3.2 unsatisfactory. Namely, the tops of the so-called soils pyramids that press on the weld. The wear is further increased by the temperature at which the upper welding plate 1 is heated.

Due to this fact, the top welding plates 1 need to be replaced regularly, which entails a considerable cost, since the surface treatment of the upper welding plates is very demanding and consequently expensive.

The prior art in the art does not apply a hard coating on the welding surface of the upper welding plate 1, which is a common problem of the prior art wearing down the lower surface of the upper welding plate.

I only find one Patent in the SIPO database with publication number: 9700226, which has the same name as our present invention.

However, this patent deals with high frequency welding. The bottom welding plate is made of elongated sections and is movable. The welding plate covered by this patent does not have a pyramid shaped contour. It does not even have a contour designed to wear when embossing.

Therefore, this patent does not solve the problem that is being solved by our present invention, and therefore it can be argued that this patent discloses completely different inventions than our present invention.

Under the name Welding Machine, I find a patent published under publication number: 21996.

This patent addresses the method of optical measurement and comparison of welds and specifies the method of inspection of welds. Defines and publishes the invention of optical welding measurement on the basis of which optimal welding technology is determined. This patent is completely different from the present invention because it does not use a pyramid-engraved welding plate. It does not describe welding methods at all, but describes the determination of measurement methods for already welded welds or welds made of metal.

I find a lot of patents in the SIPO patent base called "welding", some of which I describe:

Patent published under no. Publication: 24845

Suggests strip welding. In this case, it primarily deals with tensioning, positioning and welding of collisions with each other.

Also, this patent does not use an engraving plate and is completely different from our proposed patent.

Patent published under no. Publications: 23667

It proposes to optimize the welding vacuum machine for the rolling - packing of food products. This patent deals primarily with running both parts of a welding machine and does not use a pyramid-shaped engraving plate. It uses a completely different technique and is completely different from our proposed invention.

Patent published under no. Publications: 21360

It represents thermal welding of the sleeves where the cylinder positions the apprentice. Also, this patent does not have a welding plate with a pyramid-shaped engraving.

This patent uses a completely different technique than our present invention.

There are many other patents in the SIPO patent base, but all of them use different technical solutions than our present invention.

None represents a welding plate that has an engraving to press into the apprentice

The present invention, using the technical invention of applying solid carbide to the welding surface of the upper welding plate, almost completely eliminates the wear of the welding surface of the welding plate 1.

Description of pictures:

Figure 1: Schematic representation of both welding plates: upper welding plate 1, lower welding plate 2, both coils: upper coil 3.1, lower coil 3.2, the nest for product 3.3 and the weldable product 4. An elastic base 5 is visible above the top welding plate 1.

Figure 2: Displays the top welding plate 1 with surface 1.3 engraved pyramids (outline and floor plan)

Figure 3: Shows detail A - enlarged cross-section of welding surface 1.1, 1.2 and 1.3, where the coating layers and the base layer of the upper welding plate 1 are visible.

The essence of the invention is that the top welding plate 1, instead of aluminum alloy, was made of a copper alloy of the following composition, from Co = l, 0%, Ni = l, 0%, Be = 0,5%.

Fe = <0.2%, SI = <0.2%, Cu = other.

A base layer of NiP (nickel) 1.2, 8 to 15 microns thick, with a final CrN layer, was applied to this base layer, which is made in the form of an engraving pyramid with the dimensions of the dark pyramid a, the wheelbase pyramid b and the elevation angle of the pyramid alpha. (chromium nitride) 1.3, 1 to 5 microns thick.

The base layer 1.1 must be made with a surface treatment of roughness N4 or finer.

NiP (nickel) layer 1.2, has the function of distributing the surface pressures and the function of the soft layer, which prevents the hard coating or application. the final layer of 1.3 CrN (chromium nitride) cracked or cracked and eventually settled. While such technology is known, it has never been used for the purpose described in this proposed technical invention.

Therefore, for the application of NiP (nickel) layer 1.2, known electrolytic deposition techniques may be used, which may be different. It is only important to produce a thin layer of NiP (nickel) 1.2, which has just as smooth a surface as the base layer of pyramid 1.1 engraving. The application of the layer is not an object of the present invention, but it is used as a known state of the art but in the product category where it has not been used before.

Just like the application of NiP (nickel) layer 1.2, which is applied to the basic engraving layer with pyramids, by known technological processes, NiP (nickel) layer 1.2 is finally applied layer 1.3-CrN (chromium nitride). This final layer 1.3 is further cured by a specific heat treatment at 200 ° C. Also, this method of application is not an object of the present invention but is first used in this product category.

It is particularly important that the application of NiP (nickel) layer 1.2 is applied for the first time in this product category, to which a final layer 1.3 - CrN (chromium nitride) - hard carbide - PVD coatings is applied.

Instead of the final layer of hard carbide 1.3, e.g. titanium oxide or any other hard coating of PVD coating having the function of increasing the wear resistance of its surface against the polymer and thus constituting the final layer 1.3.

It is important that the base surface of the 1.1 engraving with the pyramids is made with extreme precision and with a machining rate of N4 or finer.

If the base surface 1.1 were rough, then the final layer 1.3 would be equal or even rougher.

The coarser the surface of the final layer, the greater the friction towards the top weld 3.1. If friction is greater, more energy is released on the sliding surfaces, which is partly converted into thermal energy and partly into work that causes the wear of the apprentice 3.1 and the final layers 1.3.

For ease of understanding, below, we describe the welding process of Screwdrivers 3.1 and 3.2, between which we weld the product 4.

Through the lower welding plate 2 passes the lower weld, which has preformed sockets 3.3 into which the products are inserted 4. Above the weld 3.2, the upper weld 3.1, which has a flat surface, travels at the same speed. At the welding point, both apprentices 3.1 and 3.2 are stopped at the same time, and the upper welding plate 1, with its surface 1.3, presses on the upper applique 3.1, which presses on the lower applique 3.2, which sits on the upper surface 2.1 of the lower welding plate 2. the temperature transferred from the top welding plate 1 to the coil 3.1 and 3.2 and the plate pressure of the two welding plates to both coils 3.1 and 3.2, both welds 3.1 and 3.2 are contacted on the contact surfaces and the object 4 is sealed in the nest 3.3.

On compression, the surface of the final layer 1.3, due to the geometry of the pyramid, which is indicated by the angle of rise of the pyramid alpha, which ranges from 90 to 160 degrees, the dimension of the forehead of pyramid a, which ranges from 0.1 mm to 0.5mm, and the dimension of the wheelbase of the pyramids b, which ranges from 0.3 to 1.5 mm, partially slides over the surface of the upper coil 3.1. As a result, surface friction occurs between the end surface 1.3 of the upper welding plate 1 and the surface of the upper weld 3.1. Since apprentice 3.1 is in contact with the end surface 1.3 of the top welding plate 1, only once, since the hatching phase is completed in one cycle, no wear on the appliance surface 3.1 occurs. The final surface 1.3 of the top welding plate 1 repeats this cycle until the surface of the engraving of the pyramids is worn.

When using a solid carbide coating and thus forming an extremely wear-resistant end surface 1.3 of the upper welding plate 1, the wear of this surface when rubbed against the upper welding plate 3.1 is virtually nullified and the life of the welding plate 1 thus produced is virtually unlimited and reaches the life of the lower welding plate 2, which is made of steel and is not heated.

The coating layer 1.2 and the final layer 1.3 are extremely thin and have very good thermal conductivity, so they do not reduce the heat transfer from the top welding plate 1 to the coil 3.1.

It is important that the final layer 1.3 of the top welding plate 1, due to slippage after weld 3.1, be as smooth as possible, so that the surface treatment 1.1 of the upper welding plate 1 must be at least N4 or finer after the copper layer 1.2 is applied.

Any other carbide or e.g. titanium oxide or the like, achieving a hardness of at least 60Hrc.

The thickness D of the top welding plate 1 must be sufficient to ensure that the final layer 1.3 is rigid, thereby preventing the final layer 1.3 from breaking. For this reason, the thickness D of the top welding plate should be at least 10 mm or more.

The upper welding plate 1 is heated by electrically resistive heaters in the range of 150 to 250 degrees Celsius and the temperature tolerance is up to 5 degrees Celsius.

The upper welding plate 1 may also be heated by different heating modes. It only matters that the final layer 1.3 is evenly heated.

If the final layer 1.3 was heated unevenly or if the temperature of the upper welding plate 1 was constantly and relatively rapidly changing, due to the dilatations of the base part of the upper welding plate 1, it could break the final layer 1.3.

In the case of cracking of the final layer 1.3, the friction when screaming into the upper weld 3.1 would increase due to cracks. As a result, the final layer 1.3 would be deposited and the layer 1.2 would wear out. After the wear of layer 1.2, due to the insertion of the lower welding plate 1 into the upper coil 3.1, the surface of the pyramid engraving in the base part of the upper welding plate would begin to wear out.

This would result in an inconsistent pyramid engraving, which would lead to an inconsistent weld, since the upper weld 3.1 would not get close enough to the lower vayen 3.2 at the top of the pyramid engraved top.

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The present invention does not address the heating method of the upper welding plate 1, but merely provides guidance as to why the temperature of the upper welding plate 1 or the final layer 1.3 is as important as possible

The bottom welding plate 2 is made of steel and unheated. The lower welding plate 2 has the task of extracting excess heat, which must be removed after the hatching phase from the lower coil 3.2. The upper coil 3.1 transfers its heat to the lower coil 3.2, and the lower coil 3.2 transfers its heat to the lower weld plate 2.

Of particular importance is the method of guiding the upper welding plate 1 towards the lower welding plate 2, which must be carried out in such a way that the surface pressure from the upper welding plate 1 is uniformly transferred through the two welders 3.1 and 3.2 to the lower welding plate 2.

The different geometry arrangements between the pyramids ensure that the pressure is transferred to the appropriate point along the thickness of the weld, and that the pressure conditions are appropriately distributed so that the weld 3.1 and the weld 3.2 are welded over the entire intended welding surface.

So we have two options for running the upper welding plate 1 free upper welding plate 2, namely:

1. Or with very precise and very parallel guides, to achieve completely complementary planes of welding plates 1 and 2.

2. Is it that the upper welding plate 1 is clamped over an elastic polymer, or the like, that when welded into the coil 3.1, the upper welding plate 1 adapts to the plane of the middle geometric profile of the lower welding plate 2

The method described in point 1 does not take into account the thickness tolerance of the two apprentices, which greatly affects the weld quality score between apprentices 3.1 and 3.2 and is a very expensive implementation, but does not give priority to the option described in item 2.

The method described in item 2, at the same time, compensates for the thickness of the coil 3.1 and coil 3.2, as it resiliently adapts to the welding surface of the lower welding plate 2 and, even in the case of partially different coil thicknesses 3.1 and 3.2, is uniform throughout the welding surface.

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Depending on the parallelism of the top welding plate 1 to the lower welding plate, the guiding or securing of the two welding plates must be within a tolerance of + - 0.01 to 0.02 relative to the parallelism of the top layer 1.3 of the upper welding plate to the final surface of the lower welding plate 2.

The object of the invention is also a chosen method of guiding the upper welding plate 1 towards the lower welding plate 2 can also be carried out in a special manner, i.e. elastic adjustment of the top welding plate 1 to the contour or. bottom welding plate 2.

This is done in such a way that the upper welding plate 1 is clamped into the guides of the rolling machine via elastic pads or. resilient bases 5.

The elastic base 5 must connect the whole upper surface of the upper welding plate 1, which is opposite and parallel to the surface of the final layer 1.3, of the upper welding plate 1.

The elastic base 5 has the function of compressing the upper welding plate 1 with respect to the position of the lower welding plate 1 by compressing the upper welding plate 1 via the coil 3.1 onto the coil 3.2 and finally to the lower welding plate 2.

Even with slight deviations from coaxiality that could lead to the destruction of the top layer 1.3 of the top welding plate 1, the elastic base 5 has the function of adjusting the upper welding plate 1 with respect to the axis of the lower welding plate 2.

The resilient base 5 may be made of rubber or any polymer with a suitable modulus of elasticity, which can be compared with a modulus of elasticity of rubber with a hardness of 50 to 100 Shore and a thickness of rubber of 5 to lOmm.

The surface pressures of both welding plates, during welding, on the bands of both welders are from 5 to 10 bar, and the temperature of the upper welding plate is from 150 to 250 degrees Celsius.

Claims (12)

Patent claims 1. Wear-resistant welding plate, characterized in that the upper welding plate is made of a copper alloy of the following composition, namely Co = l, 0%, Ni = l, 0%, Be = 0,5%, Fe = <0 , 2%, SI = <0.2%, Cu = other. Wear-resistant welding plate according to claim 1, characterized in that the upper welding plate (1) has pyramid-shaped engravings on the lower surface (1.1), which are dimensionally determined by the length dimension of the pyramid (a), which ranges from 0.1 to 0.5mm, the wheelbase dimension of the pyramids, (b) ranges from 0.3 to 1.5mm, and the pyramid angle (alpha) ranges from 90 to 160 degree angles. Wear-resistant welding plate according to claim 2, characterized in that the surface (1.1) is machined at a roughness rate of N4 or finer. Wear-resistant welding plate according to claims 1 and 3, characterized in that an 8 to 15 micron thick NiP layer (1.2) is applied to the lower base surface (1.1) and is applied to this layer (1.2) finally a layer (1.3), 1 to 5 microns thick, made of CrN (chromium nitride). Wear-resistant welding plate according to claims 1 and 4, characterized in that the final layer (1.3) has a machining smoothness of N4 or finer. Wear-resistant welding plate according to claim 4, characterized in that the hardness of the end layer (1.3), the upper welding plate (1) is 60 Hrc or higher. Wear-resistant welding plate according to claims 1 and 2, characterized in that the thickness of the upper welding plate (D) is at least lOmm or more. Wear-resistant welding plate according to claims 1 and 4, characterized in that its end layer (1.3) is heated to a working temperature of 150 to 250 degrees Celsius. Wear-resistant welding plate according to claim 1, characterized in that the upper welding plate (1) can be clamped into the fixed guides of the rolling machine having a guiding tolerance on the vertical axis of less than 0.05 mm and guided to the lower welding plate (2). Wear-resistant welding plate according to claims 1 and 9, characterized in that the upper welding plate (1) can be clamped into the fixed guides of the rolling machine, having a tolerance of running along a parallel axis with the end surface (2.1) of the lower welding plate (2) smaller than 0.03mm and lead to the lower welding plate (2). Wear-resistant welding plate according to claim 1, 9 and 10, characterized in that the upper welding plate (1) can be clamped on an elastic base (5) with a thickness of from 5 to 10 mm, with a hardness of from 50 to 100 shores, through which the rolling machine leads to the lower welding plate (2). 12. A method of wear-resistant welding plate, characterized in that it performs a vertical downward movement in which its end layer (1.3) is pressed into the upper weld (3.1) and the heat is transferred from the end layer (1.3) to the upper weld (3.1). ) and then to the lower weld (3.2) and cause melting of both the welds (3.1) and (3.2), or contact weld without adding material.