PHE stamping process Overview

Stamping process Overview

The plate production of plate heat exchangers usually requires the stainless steel coil to be transported, levelled, cut, and then stamping, punching, cutting and other processes. Stamping is one of the key process links, through a specially designed mold, the pressure on the plate to make it plastic deformation, so as to obtain the required shape and size, in order to achieve efficient heat exchange and energy transfer.

Stamping equipment and technology

Punching machine: is the core equipment of plate heat exchanger stamping, usually need to have enough pressure and accuracy to ensure that the sheet can be accurately stamped. For example, the 50,000 tons of punches in Shandong Beichen, can be used to automatically complete the pressing and forming process of roll material.

Automatic manipulator: In the plate heat exchanger stamping automatic production line, the manipulator plays an important role. For example, Xinke Intelligent automatic stamping robot arm can realize the fast and accurate grasp, positioning and placement of the single board, greatly improving the production efficiency, while ensuring the stability and consistency of product quality.

Sensors and vision systems: With advanced sensors and vision systems, the automatic stamping line can monitor the size, position and quality of the plate in real time, ensuring that each sheet can be accurately processed into the punching machine, and can also monitor and control the production process in real time to improve production efficiency and product consistency.

Plate heat exchanger stamping is a more complex process, the following are its specific steps:

1. Raw material preparation: According to the use of plate heat exchanger environment, medium characteristics and other requirements, select the appropriate metal sheet, common stainless steel and other materials. The plate needs to meet certain quality standards, such as uniform thickness, flat surface, no obvious defects, etc., to ensure the quality of the sheet after stamping.

2. Mold design and manufacturing: According to the plate heat exchanger plate shape, size, corrugated style and other requirements, design and manufacture of special stamping die. The design accuracy and manufacturing quality of the die are very important to the quality of the stamped sheet. The die is usually composed of an upper die and a lower die, the upper die is connected to the slider of the stamping equipment, and the lower die is fixed on the work table of the stamping equipment. The mold surface needs to be precision machined and heat treated to improve hardness, wear resistance and corrosion resistance, and ensure the service life and stamping accuracy of the mold.

3. Stamping equipment commissioning: Select the appropriate tonnage and specifications of the stamping equipment, such as mechanical presses or hydraulic presses. Parameters such as nominal pressure, stroke and slider speed of the stamping equipment should meet the requirements of the stamping process. Before stamping, the stamping equipment is fully debugging, including checking whether the mechanical transmission system, electrical control system and lubrication system of the equipment are in normal operation; Adjust the stroke, closing height, stamping speed and other parameters of the slider to make it conform to the set value of the stamping process; Check whether the installation of the mold is firm and whether the gap between the upper and lower molds is uniform.

4. Sheet feeding: The prepared sheet metal is placed on the work table of the stamping equipment through the manual or automatic feeding device, and the positioning device is used to accurately position the sheet to ensure the accurate position of the sheet in the stamping process. The automatic feeding device can improve the feeding efficiency and positioning accuracy, and reduce manual operation errors. The positioning method can be mechanical positioning, optical positioning or a combination of the two ways, according to the shape, size and stamping requirements of the plate to choose the appropriate positioning method.

5. Stamping molding: Start the stamping equipment, the slider drives the upper die down quickly, closes with the lower die, exerts great pressure on the metal sheet between the upper and lower die, so that the sheet will undergo plastic deformation under the action of the die, and gradually form the required sheet shape and corrugated structure. In the stamping process, the pressure, speed and stroke of the stamping equipment need to be precisely controlled in accordance with the pre-set process parameters to ensure the quality of the stamping. At the same time, the surface quality of the die, the size of the gap and the demoulding structure will also have an important impact on the stamping effect. In order to ensure the smooth progress of the stamping process and the stability of the quality of the plate, an appropriate amount of lubricant can be applied on the surface of the mold to reduce the friction between the plate and the mold, reduce the pressure required for stamping, and prevent the surface of the plate from scratching.

6. Release and discharge: After the stamping is completed, the molded sheet is removed from the mold by the release mechanism of the mold. The ejection mechanism usually uses elastic elements (such as springs, rubber, etc.) or mechanical devices (such as ejector rods, push plates, etc.) to push the plates out of the cavity of the mold. The demoulding process should be smooth and smooth to avoid deformation or damage to the plate during the demoulding process. The demelled sheet is transported to the designated position by an automatic discharge device (such as conveyor belt, manipulator, etc.) for subsequent inspection, finishing and packaging. The automatic discharge device can improve the discharge efficiency, reduce manual intervention, and improve the degree of automation of production.

7. Quality inspection: A comprehensive quality inspection of the sheet after stamping, including dimensional accuracy, shape accuracy, surface quality, ripple quality and so on. Dimensional accuracy check can use measuring tools (such as calipers, micrometers, etc.) to measure the key dimensions of the plate to ensure that it meets the requirements of the design drawings; The shape accuracy check can accurately measure the shape of the plate through the coordinate measuring instrument and other equipment to detect whether there is deformation or deviation; Surface quality inspection mainly observes whether there are scratches, cracks, wrinkles and other defects on the surface of the plate; The quality inspection of the ripple is concerned about whether the shape, depth, spacing and other parameters of the ripple meet the process requirements. For the unqualified plate inspected, it is necessary to identify, isolate and treat, analyze the causes of the unqualified, and take corresponding improvement measures to improve the quality and production efficiency of stamping.

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