278 results about "Deep drawing" patented technology

The invention discloses steel for a battery shell and a preparation method of the steel, and relates to the technical field of steel preparation. The preparation method of the steel for the battery shell comprises the steps of converter treatment, LF refining, RH refining and continuous casting. Starting from the whole preparation process, free oxygen and the production rhythm are controlled through LF refining, time production of RH refining and continuous casting is achieved, converter end point free oxygen control is coordinated, and generation of molten steel inclusions is reduced; rH refining is momentalized and standardized, continuous casting and casting are implemented in a steady state, and the amount of residual steel is controlled, so that secondary generation of inclusions and pollution to tundish molten steel are reduced. The steel for the battery case has the good characteristics of being good in ultra-deep drawing high-plasticity strain ratio, small in anisotropy, high in surface quality and internal purity, fine and uniform in microscopic grain structure and free of the sand hole defect, and is applied to the field of smelting of high-purity steel. The device is expected to be applied to continuous unmanned large-scale production of the highest-speed shell punching machine tool in the world, import substitution is achieved, and the product quality reaches the international advanced level.

The invention relates to an integrated machining method for a niobium-tungsten alloy composite surface variable-wall-thickness thin-wall part, and belongs to the field of metal plate forming. Determining the size of a niobium-tungsten alloy plate according to the size of the composite surface; groove milling is conducted on the spinning clamping position of the niobium-tungsten alloy plate; the machined plate is arranged on a spinning tire, and a tail top is used for clamping and fixing; the variable wall thickness forming of the curved generatrix part is realized by adopting strong shearing spinning and common spinning deep drawing spinning; the equal-wall-thickness forming of the cylindrical part is realized by adopting multi-pass deep drawing and spinning; the tiny allowance of the outer wall is removed through precise turning cutting, and it is guaranteed that the wall thickness meets the product use requirement; polishing the inner and outer surfaces to reduce the surface roughness; the niobium-tungsten alloy plate is used for forming, the material utilization rate is increased, split connection weld joints are reduced through a highly-integrated forming method, and the structural reliability is improved.

The invention discloses a water-based chromium-free self-lubricating fingerprint-resistant coating as well as a preparation method and application thereof. The coating comprises the following components in percentage by weight: 15%-32% of compound polyurethane resin, 10%-23% of polyacrylic resin, 1%-5% of a silane coupling agent, 1%-5% of filler, 1%-5% of a compound of molybdenum, vanadium, titanium or zirconium, 0.1%-0.5% of a flatting agent, 1%-5% of a scratch-resistant aid and 24.5%-70.9% of water, wherein the compound polyurethane resin is formed by compounding polyurethane resins with different elongation at break. The coating is used for passivating the metal surface, such as the surface of a galvanized steel sheet, the wear resistance and corrosion resistance of the galvanized steel sheet can be remarkably enhanced, the coating is suitable for a deep drawing process, and a workpiece subjected to deep drawing can still maintain good appearance and excellent wear resistance and corrosion resistance.

The invention relates to the technical field of metal plate stamping forming, and provides a new energy power battery shell deep drawing forming process parameter optimization method which comprises the steps that orthogonal test design is carried out based on a plurality of sets of parameters, and multiple times of shell deep drawing forming tests are carried out under different process parameters; the method comprises the following steps: analyzing a shell drawing forming test by adopting a response surface method, and establishing a maximum forming reduction rate mathematical model and a minimum forming reduction rate mathematical model based on test data; taking the established mathematical model as a target function, solving an optimal solution of the process parameters by adopting a particle swarm optimization algorithm, and adjusting the process parameters in real time by adopting a PID control algorithm; and combining the optimal solution of the process parameters with left and right double-shaft load monitoring to realize deviation verification analysis of multi-objective optimization numerical values of the process parameters. According to the method, dynamic adjustment of shell deep drawing forming process parameters is achieved, the stability and consistency of the machining process are ensured, and the quality of the formed shell is improved.

The invention relates to the technical field of die forming, in particular to a variable-temperature deep drawing-rapid air expansion composite forming method for a thick titanium alloy plate. The method comprises the steps that a model of a stamping die of the end socket is established, and the thickness of a to-be-stamped plate is set; limiting conditions in the stamping process are set, and a variable-temperature deep drawing model is obtained; establishing a Backoften constitutive equation, and determining strain rate sensitive indexes and strength coefficients at different temperatures according to the material strength at different temperatures; performing a finite element simulation process according to the strain rate sensitive index and the strength coefficient to obtain a superplastic inflatable model; according to the variable-temperature drawing model and the superplastic air expansion model, a variable-temperature drawing-rapid air expansion model is established; representing the simulation performance of the variable-temperature drawing-rapid air expansion model, and analyzing a drawing result and an air expansion result; and determining a test reference according to an analysis result, and carrying out a variable-temperature drawing-rapid inflation composite forming test. According to the scheme, excessive attempts of experiments can be reduced.

The invention discloses a deep drawing part rigid-flexible composite forming die and a forming method, and relates to the technical field of part drawing forming. The forming die comprises a first cavity, a second cavity, a polyurethane pad, a polyurethane block, a first punch, a second punch and a solid particle medium. A solid particle medium is filled between the polyurethane pad and the first punch part in the first cavity; the polyurethane block is positioned in the second cavity; the first punch moves towards the direction close to the second punch, so that the polyurethane pad can deform through the solid particle medium, and the polyurethane pad and the polyurethane block can tightly press a to-be-drawn part; the second punch moves in the direction close to the first punch so that the polyurethane pad, the to-be-drawn part and the polyurethane block can deform, and at least one part of the second punch part can stretch out of the polyurethane block to be used for abutting against and drawing the to-be-drawn part. The forming quality of parts can be improved, blanks can be saved, the production cost is reduced, and the production efficiency is improved.

Disclosed is an alloyed hot-dip galvanized steel sheet in which a substrate of the alloyed hot-dip galvanized steel sheet contains 0-1.0% by mass of Si, the average Fe content in an alloyed hot-dip galvanized layer of the alloyed hot-dip galvanized steel sheet is 10-12% by mass, and the surface phase structural composition of the alloyed hot-dip galvanized layer contains a polygonal zinc-iron alloy phase, the ratio R of the length to the width of the polygonal zinc-iron alloy phase is not less than 1 and not more than Rlt; 2. The alloyed hot-dip galvanized steel plate is good in deep drawability. The invention further discloses a manufacturing method of the alloyed hot-dip galvanized steel plate, the manufacturing method is suitable for the low-silicon steel plate, the alloy phase structure of a steel plate coating is controlled by controlling the air-fuel ratio in the preheating stage and the dew point DP in the soaking stage in the continuous annealing step and the alloying temperature in the alloying step, and therefore the deep drawing performance of the steel plate is improved.

The invention discloses a method and a device for stamping and forming a flat motor shell, the method comprises 14 stations which are sequentially arranged from material sheet entering to finished product outputting, and sheet materials are sequentially conveyed to each station for deep drawing, forming, shaping, trimming and punching operation. According to the method, the complex deep drawing process is divided into seven scientific and progressive working steps, a mold in a specific shape is matched for each step, stable flowing of materials is effectively guided, and the industrial problems that in the deep drawing process, a high-depth motor shell in an irregular shape is prone to being cracked and wrinkled, and the wall thickness is uneven are fundamentally solved.

A twin-sheet wall for a plastic container with an inner plastic shell and an outer plastic shell, wherein the two plastic shells are welded together by deep drawing to form closed cavities between the two plastic shells, is known. According to the invention, both the inner and the outer plastic shell are each provided with a plurality of grooves which are curved alternately in opposite directions and extend at least largely continuously over a height and / or a width and are each open towards a surface. Use for transport containers for general cargo, especially for the automotive industry

The invention belongs to the technical field of aluminum processing, and particularly relates to a 5xxx aluminum alloy plate production process which is used for solving the problems that a traditional 5xxx aluminum alloy plate is low in strength and poor in plasticity and improving deep drawing formability. Comprising the process steps of smelting, double-roller cast rolling, cold rolling, straightening, box annealing and the like, and indexes such as the strength and the grain size of the aluminum alloy plate are comprehensively improved by optimizing alloy components and adopting the means such as asymmetrical rolling.

The invention relates to a manufacturing method of a power battery aluminum shell, the power battery aluminum shell and a power battery. The manufacturing method comprises the following steps: deeply drawing an aluminum material to form a cuboid-shaped shell blank with an opening at one end; punching the bottom of the shell blank to form a cylindrical structure with two opposite rectangular or circular open surfaces; roughly machining the edges of the two rectangular or circular open surfaces in sequence; a stamping mechanism driven by a servo motor is used for stamping the side wall from the inside to the outside of the cylindrical structure to form a step structure; and sequentially carrying out finish machining on the edges after the step structures are formed. According to the invention, the specific processing sequence is combined with the pioneering step stamping process in the industry, so that the problem that only one end of the shell is provided with the step and the step cannot be processed at the other end is firstly solved, and the problem that the R angle is easy to deform in the processing process is secondly solved, and therefore, the aluminum shell product with high precision, high strength and good adaptability is obtained.

Provided are a high-strength carbon steel suitable as a material of a can for a secondary battery, a metal can manufactured by processing same, and a secondary battery manufactured by accommodating an electrode assembly in the can. A material for manufacturing the metal can is provided in the form of a metal plate. The metal can is manufactured by deep drawing the metal plate. The metal can is made of a material in which a precipitation strengthening element including Nb is added to a carbon steel in a ratio of more than 0.05 wt.% and 0.100 wt% or less. C is contained in the carbon steel in an amount of 0.01 wt.% or more and 0.100 wt.% or less. Mn is contained in the carbon steel in an amount of 0.1 wt.% or more and 0.5 wt.% or less. Si is contained in the carbon steel in an amount of more than 0.001 wt.% and 0.5 wt.% or less.

The invention discloses a horizontal deep drawing forming system and a deep drawing forming method thereof. The horizontal deep drawing forming system comprises a deep drawing base, a deep drawing deformation thinning female die, a deep drawing guide ring and a deep drawing male die. The drawing male die, the drawing guide ring, the drawing deformation thinning female die and the drawing base are coaxially distributed. The deep drawing forming method comprises the steps that a blank is clamped by a mechanical arm and placed at the front end of the deep drawing guide ring, the deep drawing male die moves forwards to be pressed into the blank, the mechanical arm loosens and retreats, the deep drawing male die drives the blank to be sequentially pressed into the deep drawing guide ring and the deep drawing deformation thinning female die, a workpiece is shaped, a discharger is started to be clamped on the shaped workpiece, and the finished product is obtained. And the drawing male die moves backwards to detach the shaped workpiece. The drawing deformation thinning female die is integrally designed, synchronous hole shrinkage deformation and thinning are achieved, the problems of wall thickness deviation and serious external scratches are solved, the die investment is reduced, and the die cost is reduced. And the drawing guide ring is arranged to avoid unbalance loading in the die entering process caused by gravity falling of the male die and the blank.

The invention relates to a deep-drawing tool designed as a die or blank holder. It has at least one contact surface (1) for receiving a workpiece and at least one macrostructure (2). The macrostructure (2) is formed on or at the contact surface (1), and the macrostructure (2) is designed to control the material flow of the workpiece in such a way that at least one of the following parameters—locally occurring stresses, locally occurring thickness variations, locally occurring differences in material properties, or locally occurring springback—is minimized.The macrostructure (2) is formed from at least one elevation (3) of the contact surface (1) with a defined distance of the elevation tip from a form-ideal reference of the contact surface (1) as height and a defined path on the contact surface (1), wherein the height of the at least one elevation (3) of the contact surface (1) over the path is not constant and is at least 5% of the thickness of the workpiece.

The application provides a large-section differential pipe liquid filling composite forming method and device, relates to the technical field of metal pipe forming, and the large-section differential pipe liquid filling composite forming method comprises the following steps: step one, plate material blank is subjected to liquid filling deep drawing forming to form a conical shell; step two, the closed end of the conical shell is cut to obtain a conical pipe with open ends; and step three, the conical pipe is subjected to liquid filling pressure forming to obtain a target pipe. The application further provides a large-section differential pipe liquid filling composite forming device. The large-section differential pipe liquid filling composite forming method and device provided by the application can improve the size precision and quality of the pipe.

This invention discloses a water-soluble punching and shearing oil, comprising the following components in 100 parts by weight: 20.0-35.0 parts rust inhibitor; 10.0-20.0 parts lubricant; 3.0-10.0 parts surfactant; 0.5-3.5 parts bactericide and mildew inhibitor; 0.5-2.0 parts other additives; and the balance being deionized water. This punching and shearing oil can be used in various sheet metal deep drawing and punching processes. It can be diluted for use, effectively reducing users' oil costs. Simultaneously, it avoids oil mist and VOC problems caused by using oily products in the workshop, thus purifying the workshop operating environment. Parts punched and sheared using this invention have smooth surfaces, complete cuts, good gloss, and are burr-free. Processed parts are easy to clean or require no cleaning, significantly saving on overall costs such as materials, water resources, and labor.

The invention discloses an insulating multi-layer Clip applied to a power module and a preparation method of the insulating multi-layer Clip, aging and layering risks of a traditional adhesive are eliminated through an adhesive-free laminated structure of the insulating multi-layer Clip, heat resistance, chemical resistance and long-term reliability of a product are improved, and meanwhile, an adhesive layer is omitted, so that the overall thickness of the product is thinner and more flexible; through the connection of deep drawing forming and the surface silver / nickel plating process, the three-dimensional assembly requirement of the insulation multi-layer Clip is met, and the conductive performance and the contact reliability of the circuit are improved. Multiple alignment errors are avoided through a one-time pressing process, the interlayer alignment precision is extremely high, the thickness of the dielectric layer is uniform, and the electrical performance consistency is good; the size precision and the circuit integrity of the product are guaranteed through the working procedures of drilling, etching, laser cutting and the like in combination with the precise temperature control and positioning technology. The method can be applied to the technical field of chip packaging.

The invention provides a hydrodynamic deep drawing forming die and method for a step-shaped part, and relates to the technical field of plate forming. The forming die comprises a male die, an edge pressing part, a female die, a left supporting block capable of moving up and down and a right supporting block capable of moving up and down; the left supporting block is arranged at the left end of the lower surface of the upper step of the male die, the right supporting block is arranged at the right end of the lower surface of the upper step of the male die, a hollow part is defined by the left supporting block and the right supporting block, and the inner wall of the hollow part is attached to the side wall of the lower step of the male die; the outer wall contour of the hollow part coincides with the downward projection of the side wall contour of the upper step of the male die; an inner cavity of the female die is composed of an upper concave cavity and a lower concave cavity, and a fluid channel communicated with the outside is formed in the inner wall of the lower concave cavity. When the forming die provided by the invention is used for forming the stepped part, excessive thinning of a plate and a plate suspension area corresponding to the two layers of stepped fillets of the convex die can be avoided, and wrinkling of the plate suspension area is avoided.

The invention discloses an aerosol can processing device, and belongs to the technical field of aerosol can processing, the aerosol can processing device comprises an elastic ejection mechanism, the elastic ejection mechanism is arranged on a lower pressing seat, and the ejection end of the elastic ejection mechanism extends upwards to eject out an upper top cover tightly attached to a female die. According to the aerosol can machining device, the male die and the female die jointly form the die assembly, in the process of curling an upper top cover, the upper top cover formed through deep stamping or an original metal plate needs to be precisely positioned into the female die of the lower pressing base, it is ensured that the center of a workpiece is completely aligned with a die cavity, and therefore the machining efficiency is improved. Then the upper pressing seat is driven by an equipment operating mechanism to vertically press downwards along the guide columns, so that the male die and the female die are accurately butted to form a die cavity for forming a hemming section, in the die opening stage, the male die and the female die are separated under the action of a separating mechanism, and an upper top cover tightly attached to the female die is ejected out through the ejection end of an elastic ejection mechanism under the action of the elastic ejection mechanism; according to the device, the product taking efficiency is remarkably improved.

To provide a deep drawing package that exhibits stable peel strength when sealed within a temperature range of 120 to 160°C, even if a thermal history is applied to a bottom material during deep drawing molding.SOLUTION: A deep drawing package includes a top material and a bottom material. The top material is a composite film in which a sealant layer, an adjacent layer, and an outer layer are laminated in this order. The sealant layer is made of a composition containing glycol-modified polyethylene terephthalate (PET-G). The adjacent layer is made of a modified polyolefin resin containing at least one of acid-modified polyethylene, ethylene-acrylic ester copolymer, and ethylene-acrylic ester copolymer-maleic anhydride copolymer. The bottom material has a recessed part formed by deep drawing and includes PET-G in a layer facing the top material. The deep drawing package is sealed such that the sealant layer faces the bottom material, and the package has easy-to-open properties.SELECTED DRAWING: None

To provide an Al-Fe-Mn-based aluminum alloy sheet that has excellent hardness and formability, and a predetermined earing ratio.SOLUTION: An aluminum alloy sheet for drawing process contains Fe by 1.05 to 1.50%, Mn by 0.40% or less, Ti by 0.002 to 0.150%, and B by less than 0.05% in mass%, and the remainder consists of Al and impurities. The alloy sheet has a component composition regulated to Si: less than 0.40%, Cu: less than 0.03%, Mg: less than 0.05%, and V: less than 0.03% as impurities, and has the tensile strength of 170 MPa or less, the earing ratio of -2% or more and 2% or less.SELECTED DRAWING: None

The invention discloses a preparation method for improving the plastic strain ratio of 210MPa-grade high-strength IF steel. The preparation method comprises the following steps: 1) converter production; 2) RH furnace production; 3) continuous casting production; 4) heating the casting blank; (5) finish rolling; 6) a continuous annealing process; the alloy comprises the following chemical components in percentage by weight: less than or equal to 0.0030% of C; s : 0.05 to 0.15%; 0.50% to 0.80% of Mn; 0.055 to 0.080 percent of P (phosphorus); s is less than or equal to 0.010%; the content of Al < t > is 0.015 to 0.060 percent; t is 0.020% to 0.050%; 0.020% to 0.050% of Nb; n is less than or equal to 0.0040%, and B is 0.0004-0.0015%; and the balance of iron and impurities. By reasonably optimizing the process, the r value of the 210Mpa-grade high-strength IF steel is increased while the strength performance of the 210Mpa-grade high-strength IF steel meets the standard requirement, so that the deep drawability of the steel grade is improved.

This invention provides a die device for trimming within the blanking surface using a precision blanking process. The die device includes: an upper die; a lower die; a backing plate connected to the upper die at its upper part; a punch placed on the lower die, with its upper surface facing the lower surface of the backing plate; a first buffer ring, with its upper surface facing the lower surface of the upper die; and a second buffer ring, with its upper surface facing the lower surface of the backing plate. The second buffer ring is in contact with the first buffer ring during the deep drawing process and is in contact with the lower die upon completion of the deep drawing process.

This invention discloses a hammer-operated hot drawing die and forming method for thin-walled deep-cavity structural parts, aiming to solve the problems of wall thickness reduction and uneven wall thickness distribution in traditional sheet metal plastic forming processes, which cannot meet the requirements of subsequent processing. The hammer-operated hot drawing die for thin-walled deep-cavity structural parts includes an upper die, a lower die, an underpressure ring, and a closing ring. When the raw material of the part is a 15mm-30mm titanium alloy sheet, the hot drawing process uses a 3-pass forming method, with a heating temperature of 700℃-800℃ and a die drop height of 50mm-60mm per pass. When the raw material of the part is a 15mm-30mm stainless steel sheet, the hot drawing process uses a 3-pass forming method, with a heating temperature of 950℃-1050℃ and a die drop height of 50mm-60mm per pass. As shown in Figure 1, the thin-walled deep-cavity structural parts produced by this invention have uniform wall thickness distribution, high forming efficiency, and are suitable for mass production.

Method for producing a nozzle for connecting a fluid line to a container (1) made of thermoplastic material, wherein the nozzle has a first nozzle-shaped, at least single-layer material arrangement (6) and a second nozzle-shaped, at least single-layer material arrangement (7), of which the first material arrangement (6) is thinner than the second material arrangement and both have thermally deformable material as at least a predominant component and form a fusion bond with one another, wherein in a first step the first material arrangement (6) is formed into a flat film or plate or into a tube by extrusion or injection molding, that in a second step the film or plate is formed into a first preform with a nozzle contour by deep drawing or the tube is formed by blow molding, that in a third step the second material arrangement (7) is formed on one side of the first preform by injection molding,Coinjection or monosandwich process with a nozzle contour is applied, and in the case of the first preform formed from the film or plate, its base is cut out before, during or after the third step, characterized in that at least one of the material arrangements acts as a diffusion barrier layer against hydrocarbons in the finished nozzle, the second material arrangement (7) has a core layer (7b) and a skin layer (7a) which are produced in the coinjection or monosandwich process, and that the skin layer (7a) and the first material arrangement (6) form a fusion bond.

The invention provides a high-strength aluminum alloy scalloped segment ultrasonic current collaborative forming device and method.The device comprises an ultrasonic vibration device, a deep drawing forming device and a current control device, and the deep drawing forming device comprises a die pressing head, a heat-resisting flexible male die and a rigid female die; the heat-resisting flexible male die is installed in the upper die frame, the rigid female die is installed on the lower die frame, a blank machining station is formed between the heat-resisting flexible male die and the rigid female die, the die pressing head is installed at the top of the heat-resisting flexible male die, and the ultrasonic vibration device is installed at the top of the die pressing head. The ultrasonic vibration and the pulse electric field are introduced into forming at the same time, the ultrasonic vibration and the current heat effect are utilized at the same time, forming force can be reduced, springback can be reduced, and forming precision can be improved. Conventional hot working is replaced, a die device is simplified, die loss is reduced, and machining efficiency is improved.

The invention discloses a non-sticky wok and a manufacturing method, the non-sticky wok is a bottomed wok formed by drawing a plane plate, the non-sticky wok comprises a wok bottom and a wok wall rising around the wok bottom, and the top of the wok wall defines a wok edge; the wok wall is provided with a thickness reduction belt formed in the deep drawing forming process, and the thickness reduction belt is arranged between the wok bottom and the wok edge and extends in the height direction of the wok; the outer surface of the thickness reduction belt is provided with a plurality of annular grooves extending in the circumferential direction of the pot wall, and the inner surface of the thickness reduction belt is provided with annular oil storage grooves which are the same as the annular grooves in number and correspond to the annular grooves in position. Wherein the annular groove is characterized in that the wall thickness is preset on the outer side of the plane plate before the frying pan is deep drawn, and the annular oil storage groove is characterized in that the annular oil storage groove is recessed on the inner surface of the pan wall due to the fact that the annular groove is easier to generate tensile deformation compared with other parts in the deep drawing process; compared with the prior art, the production process of the non-sticky frying pan can be simplified, and the production cost can be reduced.

A kind of plate rotary body part simulation forming process entity unit wrinkle monitoring method, by constructing rotary body part forming simulation model and carrying out sheet metal deep drawing forming process simulation, extract the surface geometric information of rotary body part in simulation result, obtain the degree of surface fluctuation by converting coordinate system and comparison calculation, and then accumulate to obtain overall wrinkling evaluation.The present application does not need to establish the relationship between strain and material wrinkling instability, and obtains the micro-wrinkling on the surface of the part in the deformation simulation process by geometric method, directly judges the fluctuation of the surface of the finite element model part according to the wrinkling in the forming process of the part, and efficiently completes the fluctuation (wrinkling) comprehensive judgment of the simulation forming surface of the whole rotary body part.

This invention relates to a copper-aluminum composite strip and its preparation method, belonging to the field of metal strip material preparation. The preparation method of the copper-aluminum composite strip of this invention includes the following steps: contacting molten aluminum at 680–700°C with an unpreheated copper strip and then casting and rolling it; during the casting and rolling process, controlling the temperature of the rolls to ≤100°C, and the running speed of the copper-aluminum composite strip to be 0.5–0.8 m / min. The copper-aluminum composite strip prepared by the method of this invention has a unique multi-level heterogeneous layered structure with a macroscopic copper / aluminum heterogeneous layered structure and a nanoscale double-layer copper-aluminum compound layer interface. This can significantly improve the conductivity and ultra-high ductility of the copper-aluminum composite strip while improving the preparation efficiency, allowing the copper-aluminum composite strip to be further processed by deep drawing, bending, or twisting to prepare high-end copper-aluminum composite conductive devices.

The invention relates to a deep-drawing device for deep-drawing a continuously supplied film web (1), a dependent packaging machine and a corresponding method. A forming station (8) is provided, which is periodically timed, moves from a start position (6) to an end position (7) and from there back to the start position (6), wherein each gauge plate (41, 42, 43, 44) is brought into connection, in sequence, first with a forming vacuum mechanism (11) and then with a subsequent holding vacuum channel (12). The forming vacuum mechanism (11) is part of the periodically moving forming station (8). The holding vacuum channel (12) comprises two telescopic channel sections (13, 14) which are joined into one another, wherein the first telescopic channel section (13) is part of the periodically moving forming station (8) and wherein the second telescopic channel section (14) is assembled position-fixed with respect to a stationary machine support (2).