Welding machine

Abstract

A welding machine, preferably of the flash welding type, is designed to facilitate the maintenance of clamping means (3, 4, 6, 7) of two longitudinal metal products to be welded, such as the maintenance of clamps. Advantageously, a first structure (2) provided with first clamping means (3, 4) and a second structure (5) provided with second clamping means (6, 7) are supported in a first portion (10) of the carriage (1) delimited by a first beam (9) and a second beam (8) of the carriage (1) parallel to the feed direction X, while at least one transformer (36) is fixed to the carriage (1) and supported in a second portion (11) of the carriage (1), and the second part (11) is transversely arranged on the outer side of the first part (10). Furthermore, the two upsetting cylinders (23, 24) are arranged along a plane Y which is inclined at an acute angle that is not zero with respect to the horizontal plane and which passes through the passage region of the longitudinal metal product in the feed direction X.

Description

Technical Field

[0001] The invention relates to a welding machine, preferably of the flash welding type, for long metal products, such as billets, bars or blooms, suitable for welding the tails and heads of two consecutive longitudinal products to each other along a roller table usually arranged upstream of a rolling mill. Background Art

[0002] In rolling mills, especially those of the endless operation type, metal products coming from a casting machine or an external warehouse are welded together and then rolled seamlessly.

[0003] The metal products being welded are usually semi-finished metallurgical products such as billets, bars or blooms.

[0004] Welding is performed by joining the tail of one product to the head of the next product.

[0005] Welding is achieved by an electric shock produced by a power source connected to the products to be welded. This technique is called flash welding.

[0006] During welding, the product must be locked effectively. For this purpose, a clamping device is provided, which is used to hold the product in place during welding and usually also serves as a conductor for the welding current.

[0007] This clamping device generally comprises an element in direct contact with the product to be welded, in particular a clamp. As welding proceeds, the clamps holding the head and tail of the product to be welded are gradually brought closer by hydraulic cylinders called upsetting cylinders. This operation is necessary to connect the ends to be welded in order to eliminate any inclusions and bubbles, to compensate for the loss of material caused by melting in the form of burrs, and to allow effective bonding between the two parts to be welded, which forms a joint called a welded joint.

[0008] A known type of flash welding machine generally comprises two structures, each provided with a pair of clamps, the two structures being substantially parallel to each other and inclined at an angle of about 45° with respect to a plane defined by a carriage supporting the machine. Said inclination allows the clamps to exert a uniform contact force on the product on its side, thus allowing optimal holding and centering thereof.

[0009] Typically, a transformer provided with conductors connected to the two structures to provide current to the tail and head of the two products to be welded is located above the inclined upper surfaces of the two structures, which makes it difficult to access and therefore maintain the internal components of the machine.

[0010] WO2021156738A1 describes a welding machine developed in the last few years which provides a transformer fixed to and supported by a carriage, a part of which is arranged outside another part of the carriage, which alternatively supports two structures equipped with a clamp. This part of the carriage supporting the two structures is defined by a first beam and a second beam of the carriage, which are parallel to the feeding direction of the metal product.

[0011] In this solution, two upsetting cylinders are arranged parallel to each other in a horizontal plane. The first upsetting cylinder is arranged below the shoulders of the two structures, i.e. below the lower inclined surface. Conversely, the second upsetting cylinder is arranged substantially at the bottom of the two inclined structures, on the opposite side relative to the side where the first cylinder is located.

[0012] If, on the one hand, this solution allows access from the top and thus facilitates the maintenance of certain internal parts of the machine, which can be accessed and lifted from the top by an overhead crane, on the other hand, the disadvantage is that it is still not easy to maintain the clamps, which are the part of the machine most subject to wear and require an operator who must enter the interior of the machine to maintain and manually replace them.

[0013] In fact, in order to access the clamp maintenance area, the operator is located in front of a second upsetting cylinder arranged at the bottom of two inclined structures. This second upsetting cylinder occupies all or at least part of the area arranged above the lower clamp, which requires disassembly of the second upsetting cylinder in order to obtain a space allowing comfortable access to the clamp maintenance area.

[0014] Therefore, there is a need to address at least the above-mentioned disadvantages by providing a welding machine that can provide easier maintenance of the clamp by making the operating space for performing the maintenance easily accessible. Summary of the invention

[0015] One of the objects of the present invention is to create a welding machine, preferably of the flash welding type, which allows easy access to the fixture maintenance areas from the side, with minimal need for disassembly, reassembly and alignment of parts, thus allowing fast maintenance and cleaning; at the same time, providing the possibility of operation with common auxiliary equipment (such as cranes and overhead cranes) to remove heavy parts relative to the fixture support structure.

[0016] Another object of the invention is to create a welding machine that is simple from a structural point of view and that still allows the known welding machines to perform the necessary movements.

[0017] Another object of the invention is to create a welding machine that increases operator safety.

[0018] According to the present description, the present invention achieves at least one of these and other objects, which will be apparent, by means of a welding machine, preferably of the flash welding type, for welding together the tail of a first longitudinal metal product and the head of a second longitudinal metal product along the feed direction X of said longitudinal metal products, the machine comprising a carriage suitable for sliding along the feed direction X, said carriage supporting:

[0019] - a first structure connected to said support;

[0020] - a first clamping device arranged on the first structure, for clamping the tail of the first metal product or the head of the second metal product;

[0021] - a second structure slidable relative to the first structure and the carriage parallel to the feeding direction;

[0022] - a second clamping device provided on the second structure, for clamping the head of the second metal product or the tail of the first metal product;

[0023] - at least one transformer provided with conductors connected to the first clamping means and the second clamping means, respectively, to supply current to said tail and said head;

[0024] wherein the first structure and the second structure are supported in a first part of a carriage defined by a first beam and a second beam of the carriage parallel to the feed direction X, and the at least one transformer is fixed to the carriage and supported in a second part of the carriage, which second part is arranged laterally outside the first part,

[0025] wherein the first structure and the second structure define respective longitudinal axes Z, Z' inclined at a first acute angle relative to a horizontal plane;

[0026] Two upsetting cylinders are arranged parallel to the feed direction X to move the second structure toward or away from the first structure along the feed direction X,

[0027] wherein the axes of the two upsetting cylinders are arranged along a plane Y which passes through a passage area of ​​the longitudinal metal product along a feed direction X, said passage area being delimited by the first clamping device and the second clamping device;

[0028] wherein the first upsetting cylinder is arranged on one side relative to the passage area, at least partially below the first side of the first structure and the second structure, and the second upsetting cylinder is arranged on the other side relative to the passage area, substantially at the bottom of the second side of the first structure and the second structure, opposite to the first side,

[0029] It is characterized in that the plane Y is inclined relative to the horizontal plane at a second acute angle that is smaller than the first acute angle and is not zero.

[0030] Preferably, in order to properly distribute the upsetting forces without exerting forces on the structure, said plane Y comprises the longitudinal centre axis of the passage area of ​​the longitudinal metal product along the feed direction X, said passage area being delimited by the lower and upper clamping means in the clamping position of the metal product. This longitudinal passage area will be occupied by the metal product in the welding area. It is therefore preferred that the lower clamping means occupy a fixed position, while the upper clamping means are adjustable along the respective longitudinal axis Z, Z' of the respective structure.

[0031] Another advantage is easier access to the lower upsetting cylinder for equally possible maintenance. In fact, the innovative position of the lower upsetting cylinder makes its disassembly easier.

[0032] In addition, the new position of the upsetting cylinder made it possible to install a larger spark arrester that more effectively protects the machine and the operator.

[0033] Further features and advantages of the present invention will become more apparent from the detailed description of exemplary but non-exclusive embodiments.

[0034] The dependent claims describe particular embodiments of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In the description of the present invention, reference is made to the accompanying drawings, which are provided by way of non-limiting examples, in which:

[0036] Figure 1 shows a perspective view of a welding machine according to the present invention;

[0037] Figure 2 Shows Figure 1 A partial cross-sectional side view of a welding machine;

[0038] Figure 2a Shows Figure 2 an enlarged view of a portion of the mid-lateral view;

[0039] Figure 3 Shows Figure 1 A perspective view of a portion of a welding machine;

[0040] Figure 4 A side view, partly in section, of a second embodiment of a welding machine according to the invention is shown.

[0041] The same reference numerals and letters in the drawings represent the same elements or components. DETAILED DESCRIPTION

[0042] Some examples of welding machines of the flash welding type according to the present invention are explained with reference to the accompanying drawings.

[0043] In all embodiments of the invention, a welding machine suitable for welding the tail of a first longitudinal metal product to the head of a second longitudinal metal product along a feed direction X of said longitudinal metal products comprises a carriage 1 suitable for sliding on at least two sliding guides 15, 16 over a roller table (not shown) along said feed direction X on which the longitudinal metal products, such as billets, blanks or bars, advance.

[0044] Bracket 1 supports the following ( Figure 1 ):

[0045] - a first structure 2 connected to the bracket 1;

[0046] - first clamping devices 3, 4 arranged on the first structure 2, for clamping the tail of the first metal product or the head of the second metal product;

[0047] - a second structure 5 slidable relative to the first structure 2 and the carriage 1 parallel to the feeding direction X;

[0048] - second clamping devices 6, 7 arranged on the second structure 5, for clamping the head of the second metal product or the tail of the first metal product;

[0049] - at least one transformer 36 provided with conductors 37, 38, 39, 40 connected to the first clamping means 3, 4 and the second clamping means 6, 7 respectively ( Figure 2 and Figure 3 ) to provide current to the tail and the head.

[0050] The first structure 2 defines a longitudinal axis Z ( Figure 1 and Figure 3 ), which axis is inclined relative to the horizontal plane at a first acute angle, which first acute angle is preferably between 40° and 70°, for example 45°. The second structure 5 defines its own longitudinal axis Z′ ( Figure 1 and Figure 2 ), the second structure 5 is arranged parallel to the first structure 2 and is spaced apart from the first structure 2 along the feeding direction X of the product to be welded.

[0051] In particular, the first clamping means 3, 4 of the first structure 2 comprises a respective upper clamp 3 and a respective lower clamp 4. Each clamp 3, 4 is movable along an axis Z by a respective movement system provided in the structure 2.

[0052] The second clamping means 6, 7 of the second structure 5 comprise a respective upper clamp 6 and a respective lower clamp 7. Also in this case, each clamp 6, 7 is movable along the axis Z', possibly by a respective movement system provided in the structure 5.

[0053] Such a moving system comprises, for example, a hydraulic cylinder or a jack, or an electric actuator or a mechanical moving device, such as a cam or an eccentric device.

[0054] The movement and therefore adjustability of all the clamps of the clamping device advantageously eliminates the need to have to tilt or slightly rotate the two structures 2, 5 to prevent the metal product, such as a blank, from dragging on the lower clamp, which is fixed in the known machines of the prior art.

[0055] In an alternative variant, only the upper clamp 3 is movable along the Z axis, while the lower clamp 4 is in a fixed position. Similarly, only the upper clamp 6 is movable along the axis Z', while the lower clamp 7 is in a fixed position.

[0056] The welding machine of the present invention provides an adjustment device, which includes or is composed of two upsetting cylinders 23, 24 arranged parallel to the feed direction X ( Figure 2 and Figure 3 ) to move the second structure 5 closer to or farther from the first structure 2 along the feed direction X. In particular, this approach occurs when two products are flash welded.

[0057] The upsetting cylinders 23, 24 are pivoted at their first end to the first structure 2 and at their second end to the second structure 5 by respective pins.

[0058] The two upsetting cylinders 23 and 24 are arranged along plane Y ( Figure 2 , Figure 2a ), which plane is defined by the longitudinal axes of the two upsetting cylinders 23 , 24 and passes through the passage area of ​​the longitudinal metal product along the feed direction X. The passage area is delimited by the upper clamps 3 , 6 and the lower clamps 4 , 7 .

[0059] In the illustrated variant, the first upsetting cylinder 23 is arranged on one side relative to the passage area, at least partially below the first side of the first structure 2 and the second structure 5, while the second upsetting cylinder 24 is arranged on the other side relative to the passage area, essentially at the bottom of the second side of the first structure 2 and the second structure 5, opposite to the first side.

[0060] Advantageously, the plane Y is inclined relative to the horizontal plane at a second acute angle that is less than the first acute angle and non-zero. This configuration allows easy lateral access to the clamp maintenance area in a direction transverse to the feed direction X, allowing rapid maintenance and cleaning thereof. Preferably, the second acute angle is less than or equal to 30°.

[0061] In a variant of the invention, the first upsetting cylinder 23 is arranged at a higher height than the second upsetting cylinder 24 .

[0062] In a preferred variant, the lower clamping means 4, 7 of the first clamping means 3, 4 and the second clamping means 6, 7 occupy a fixed position, while the upper clamping means 3, 6 are adjustable along the respective longitudinal axis Z, Z' of the respective structure 2, 5. An upper horizontal plane W tangential to the second upsetting cylinder 24 is arranged above the upper end 19 of the lower clamping means 4, 7. However, the distance between the upper horizontal plane W and the upper end 19 of the lower clamping means 4, 7 is less than 20 mm, preferably less than 15 mm, for example in the range of 8 to 12 mm.

[0063] Preferably, the lower clamping means 4, 7 define a horizontal flat surface 25 for resting the metal product, and the distance between said upper horizontal plane W and said horizontal flat surface 25 is in the range of 100 to 150 mm, preferably in the range of 110 to 140 mm, depending on the size of the metal product to be welded with a polygonal cross section (e.g. square), such as a billet, a bar or a bloom. For example, billets or billets with a variable side ranging from 100 to 250 mm can be welded with the machine of the invention. For a product with a side length of 250 mm, the distance between the upper horizontal plane W and the horizontal flat surface 25 is the greatest, while for a product with a side length of 100 mm, this distance is the smallest.

[0064] The above configuration provides the possibility of installing a removable walkway 20, which is arranged above the second upsetting cylinder 24 and close to the lower clamping devices 4, 7, which is convenient for the operator to access.

[0065] In particular, the walkway 20 may be arranged above the frame 50 ( Figure 2a ), the second upsetting cylinder 24 is accommodated inside the frame 50. Preferably, the distance between the upper surface of the frame 50 and the upper end 19 of the lower clamping device 4, 7 is less than 70mm, preferably less than 50mm.

[0066] At least one step 21 may be provided between the walkway 20 and the lower clamping device 4, 7 to allow an operator to more easily access the clamps and access the clamp maintenance area without the volume of the lower upset cylinder 24. The step 21 is provided at a lower height relative to the walkway 20.

[0067] In a preferred particular case, the longitudinal center axis of the longitudinal channel area of ​​the metal product lies in the plane Y along the feed direction X, and the channel area is delimited by the lower clamping devices 4, 7 and the upper clamping devices 3, 6 in its clamping position of the metal product and is therefore occupied by the metal product in the welding area.

[0068] Also in this case, it is preferred that the lower clamping devices 4 , 7 occupy a fixed position, whereas the upper clamping devices 3 , 6 are adjustable along the respective longitudinal axis Z, Z′ of the respective structure.

[0069] In particular, when the dimensions of the metal products vary, in order to ensure that the longitudinal center axis of the passage area of ​​the metal products is fixed and always lies on plane Y, it may be sufficient to use pads with different sizes and therefore different thicknesses, at least for the lower clamping devices 4, 7, depending on the size of the products to be welded.

[0070] Therefore, advantageously, it is preferred that the dimensions of the pads mounted on the clamping device (preferably the dimensions of the pads mounted on the lower clamping device 4, 7 - especially the thickness) are such that the longitudinal center axis of the passage area of ​​the longitudinal metal product always lies on plane Y.

[0071] Therefore, when it is necessary to change the size of the product to be welded, the following should be done:

[0072] - The area where the operator approaches the clamping device from the side;

[0073] - Remove the gasket from at least the lower clamping device 4, 7;

[0074] - Install new gaskets at least on the lower clamping devices 4,7.

[0075] In another variant of the invention (not shown), the second upsetting cylinder 24 is completely arranged below the lower clamping device 4, 7 of the first clamping device 3, 4 and the second clamping device 6, 7, that is, below the lower end of the lower clamp. In this case, the walkway 20 can be provided without the step 21.

[0076] Optionally, the walkway surface for the operator comprises a walkway 20 arranged parallel to the feed direction X and two further walkways 22 arranged orthogonally to the walkway 20 at the ends of the walkway 20 so as to define a generally U-shaped walkway surface which allows the operator to also move laterally to the two structures 2, 5.

[0077] At least one infeed guide 17 and at least one outfeed guide 18 are optionally provided for feeding the metal product to or from the welding machine, each guide being constrained to a respective structure 2, 5 along a feed axis X. Optionally, the guides may be part of the carriage 1. The guide rails 17, 18 may be arranged below the respective walkway 22 (when provided).

[0078] In a first embodiment of the invention, the first and second structures 2, 5 are supported and possibly also contained in a first portion 10 of the carriage 1 defined by a first beam 9 and a second beam 8 of the carriage, the first beam 9 and the second beam 8 being parallel to each other and to the feed direction X, while at least one transformer 36 is fixed to the carriage 1 and supported and possibly completely contained in a second portion 11 of the carriage 1, which is arranged transversely outside the first portion 10. The first upsetting cylinder 23 is arranged on the first portion 10 of the carriage between the at least one transformer 36 and the structures 2, 5, and therefore between the second portion 11 of the carriage and the structures 2, 5.

[0079] The transformer 36 may be a single transformer. Alternatively, a group of transformers may be provided which simultaneously supply power to the clamps 3, 4, 6, 7 via the conductors 37, 38, 39, 40.

[0080] In a variant of this first embodiment (not shown), for example two or more transformers are provided, which are fixed to the carrier 1 and supported and possibly also completely contained within the second portion 11 .

[0081] In a first embodiment of the invention, the second portion 11 of the carriage 1 may be defined by said second beam 8 and a third beam 14 of the carriage 1, preferably parallel to the second beam 8. The first beam 9 and the third beam 14 are peripheral beams of the carriage 1, while the second beam 8 is an intermediate beam. At least two further peripheral beams may be provided, transverse to, preferably perpendicular to, the beams 9, 8, 14, to define the perimeter of the carriage 1 together with the beams 9, 14.

[0082] The carriage 1 is preferably arranged on two sliding guides 15, 16 fixed directly or through a frame to the floor below the welding machine, said sliding guides being parallel to each other and to the axis X. Figures 1 to 3 In the variant shown, the first beam 9 and the second beam 8 of the carriage 1 are positioned on respective sliding guides 16, 15. In this case, the first portion 10 of the carriage 1 is located above the area delimited by the sliding guides 15,16.

[0083] Alternatively, the beams 9 , 8 can also be offset relative to the sliding guides 16 , 15 .

[0084] Optionally, conductors 37, 38, 39, 40 connecting the transformer 36 to the first clamping devices 3, 4 and the second clamping devices 6, 7, respectively, pass under the first structure 2 and the second structure 5, respectively, so as to make the space between the first clamping devices 3, 4 and the space between the second clamping devices 6, 7 freely accessible from below and above without longitudinal metal products being welded.

[0085] Advantageously, since the transformer 36 is not arranged on the structure 2, 5, the space between the first clamping means 3, 4 and the space between the second clamping means 6, 7 are freely accessible both from above and from below without longitudinal metal products being welded.

[0086] In a variant (not shown), two or more transformers are provided in the second part 11 of the bracket 1, for example only two are arranged one above the other, the first upper conductor and the first lower conductor coming out of the corresponding transformer and reaching the clamps 3, 4 of the first structure 2 respectively; while the second upper conductor and the second lower conductor come out of their respective transformers and reach the clamps 6, 7 of the second structure 5 respectively.

[0087] In all variants, the current paths are such that two circuits are closed between the upper clamp 3 , 6 and the respective lower clamp 4 , 7 .

[0088] In addition to being arranged substantially parallel to each other, the first and second structures 2 , 5 are preferably arranged transversely to the first and second beams 9 , 8 , preferably orthogonal to the first and second beams 9 , 8 .

[0089] In particular, in the first variant, the first beam 9 and the second beam 8 have respective first portions and respective second portions, the first portions being close to the first structure 2 and the first structure 2 being integrally fixed to the first portions, and the second portions being remote from the first structure 2 and the second structure 5 being slidably connected to the second portions.

[0090] In a variant of the present invention, the second portion of the first beam 9 is inserted into the first through hole of the second structure 5 ( Figure 1 ), a first roller or pad 12 is provided inside the second structure 5 for the second structure 5 to slide on the first beam 9; and the second portion of the second beam 8 is inserted into the second through hole of the second structure 5, and a second roller or pad 13 is provided inside the second structure 5 ( Figure 1 ) for the second structure 5 to slide on the second beam 8.

[0091] If it is necessary or desirable to slightly move the two structures 2, 5 in order to prevent the metal product (for example a blank) from dragging on the lower clamp, a second variant (not shown) provides for the first structure 2 and the second structure 5 to be supported in the first part 10 of the carriage 1 not by beams 8, 9 of the carriage itself, but by a lifting system suitable for lifting said first structure 2 and said second structure 5 together relative to the carriage 1, by rotation along a plane transverse to the feed direction X. This rotation may be within the range of 1° to 25°, for example 1° to 15°. This lifting system thus makes it possible to move the structures 2, 5 relative to the product to be welded.

[0092] The lifting system is preferably of linkage type.

[0093] Another advantage of the present invention may be that the carriage 1 is provided with at least one motor 31 connected to a gear 32 adapted to engage a gear arranged on the sliding guides 15, 16 ( Figure 2 ) on at least one of the racks 33, preferably on one side of the sliding guide rail 15.

[0094] Figure 4 A second embodiment of the welding machine of the invention is shown. The above description of the first embodiment also applies to this second embodiment. The latter differs from the first embodiment in that it provides:

[0095] a first transformer 36 fixed to the bracket 1 and supported, possibly completely contained in the second portion 11 of the bracket 1 , arranged transversely outside the first portion 10 delimited by the first beam 9 and the second beam 8 ;

[0096] and a second transformer 36 ′ fixed to the bracket 1 and supported and possibly contained in a third portion 11 ′ of the bracket 1 , which is arranged laterally outside the first portion 10 and opposite the second portion 11 .

[0097] A first portion 10 of the carriage 1 is delimited by a first beam 9 and a second beam 8 of the carriage 1 which are parallel to the feed direction X.

[0098] The second portion 11 of the carriage 1 is delimited by said second beam 8 and a third beam 14 of the carriage 1 , preferably parallel to the second beam 8 .

[0099] The third portion 11 ′ of the carriage 1 is delimited by said first beam 9 and by a fourth beam 14 ′ which is preferably parallel to the first beam 9 .

[0100] The fourth beam 14 ′ and the third beam 14 are peripheral beams of the carriage 1 , whereas the first beam 9 and the second beam 8 are intermediate beams of the carriage.

[0101] At least two further peripheral beams are provided, transversely, preferably perpendicularly, to the beams 14 ′, 9 , 8 , 14 , so as to define, together with the beams 14 ′, 14 , the perimeter of the carriage 1 .

[0102] In this second embodiment, the upper and lower conductors come out of the first transformer 36 and reach the upper clamps 3, 6 of the structures 2, 5, respectively, while the upper and lower conductors come out of the second transformer 36' and reach the lower clamps 4, 7 of the structures 2, 5, respectively. Also in this case, the current path is such that two circuits are closed between the upper clamps 3, 6 and between the lower clamps 4, 7, respectively.

Claims

1. A welding machine, preferably of the flash welding type, for welding the tail of a first longitudinal metal product to the head of a second longitudinal metal product along a feed direction X of the longitudinal metal products, the machine comprising a carriage (1) adapted to slide along the feed direction X, The bracket (1) supports the following: - a first structure (2) connected to said bracket (1); - a first clamping device (3, 4) arranged on the first structure (2) for clamping the tail of the first metal product or the head of the second metal product; - a second structure (5) slidable relative to the first structure (2) and the bracket (1) parallel to the feeding direction; - a second clamping device (6, 7) arranged on the second structure (5) for clamping the head of the second metal product or the tail of the first metal product; - at least one transformer (36) provided with conductors connected to the first clamping means (3, 4) and the second clamping means (6, 7), respectively, to supply electric current to the tail and the head; wherein the first structure (2) and the second structure (5) are supported in a first portion (10) of the bracket (1) defined by a first beam (9) and a second beam (8) of the bracket (1) parallel to the feed direction (X), and the at least one transformer (36) is fixed to the bracket (1) and supported in a second portion (11) of the bracket (1), the second portion (11) being arranged laterally outside the first portion (10), wherein the first structure (2) and the second structure (5) define respective longitudinal axes (Z, Z'), the respective longitudinal axes (Z, Z') being inclined at a first acute angle relative to a horizontal plane; Two upsetting cylinders (23, 24) are arranged parallel to the feed direction X to move the second structure (5) toward or away from the first structure (2) along the feed direction X, wherein the axes of the two upsetting cylinders (23, 24) define a plane Y, the plane Y passing through a passage area of ​​the longitudinal metal product along the feed direction X, the passage area being delimited by the first clamping device (3, 4) and the second clamping device (6, 7); wherein the first upsetting cylinder (23) is arranged on one side relative to the passage area, at least partially below the first side of the first structure (2) and the second structure (5), and the second upsetting cylinder (24) is arranged on the other side relative to the passage area, substantially at the bottom of the second side of the first structure (2) and the second structure (5), opposite to the first side, It is characterized in that the plane Y is inclined at a second acute angle relative to the horizontal plane, and the second acute angle is smaller than the first acute angle and is not zero.

2. The machine according to claim 1, wherein the first upsetting cylinder (23) is arranged at a higher height than the second upsetting cylinder (24).

3. A machine according to claim 1 or 2, wherein the first clamping device (3, 4) and the lower clamping device (4, 7) of the second clamping device (6, 7) occupy a fixed position; wherein an upper horizontal plane (W) tangent to the second upsetting cylinder (24) is arranged above the upper end (19) of the lower clamping device (4, 7); and wherein the distance between the upper horizontal plane (W) and the upper end (19) is preferably less than 20 mm, more preferably less than 15 mm.

4. A machine according to claim 3, wherein the lower clamping device (4, 7) defines a horizontal plane (25) for supporting the metal product; and wherein the distance between the upper horizontal plane (W) and the horizontal plane (25) is in the range of 100 to 150 mm, preferably in the range of 110 to 140 mm.

5. The machine according to claim 1 or 2, wherein the second upsetting cylinder (24) is arranged completely below the lower clamping means (4, 7) of the first clamping means (3, 4) and the second clamping means (6, 7).

6. A machine according to any one of the preceding claims, wherein: The first clamping device (3, 4) and the lower clamping device (4, 7) of the second clamping device (6, 7) occupy a fixed position; and wherein the size of the pads of the clamping devices (3, 6, 4, 7), preferably the size of the pads of the lower clamping device (4, 7), in particular the thickness of the pads, makes the longitudinal metal product channel area along the longitudinal center axis of the feed direction X located on the plane Y, and the channel area is bounded by the lower clamping device (4, 7) and the upper clamping device (3, 6) in their metal product clamping position.

7. A machine according to claim 3 or 4 or 5 or 6, wherein a removable walkway (20) is also provided, wherein the walkway (20) is arranged above the second upsetting cylinder (24) and close to the lower clamping device (4, 7); preferably, wherein at least one step (21) is provided between the walkway (20) and the lower clamping device (4, 7).

8. A machine according to any one of the preceding claims, wherein: The first acute angle is in the range of 40° to 70°, and the second acute angle is less than or equal to 30°.

9. A machine according to any one of the preceding claims, wherein: Only one transformer (36) or two or more transformers are provided, and the transformer is completely supported in the second part (11) of the bracket (1); or at least two transformers are provided, a first transformer (36) of the two transformers is fixed to the bracket (1) and supported in the second part (11) of the bracket (1), and a second transformer (36') of the two transformers is fixed to the bracket (1) and supported in a third part (11') of the bracket (1), and the third part (11') is arranged laterally outside the first part (10) on the side opposite to the second part (11).

10. Machine according to claim 1 or 9, wherein said second portion (11) is defined by said second beam (8) and a third beam (14) of said carriage (1), preferably parallel to said feed direction (X).

11. The machine according to claim 10, wherein: In the case where only one transformer (36) or both transformers are fully supported in the second portion (11), the first beam (9) and the third beam (14) are peripheral beams of the bracket (1) and the second beam (8) is an intermediate beam; or wherein, in the case where the first transformer (36) is supported in the second portion (11) of the bracket (1) and the second transformer (36') is supported in the third portion (11') of the bracket (1), the third portion (11') is delimited by the first beam (9) and the fourth beam (14'), the fourth beam (14') and the third beam (14) are peripheral beams of the bracket (1), and the first beam (9) and the second beam (8) are intermediate beams of the bracket.

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