How to make a hydraulic press from a hydraulic cylinder
Horizontal and vertical
These tools differ in their design features. Each product is equipped with a special pressing panel. Only in one case it moves horizontally, in the other it moves vertically.
Vertical models are relevant for pressing as well as baling of workpieces. Horizontal methods are in demand for bending and cutting. Such a press is relevant in waste recycling. it allows you to perform the pressing of plastic, textile waste, as well as feather, corrugated packaging and waste paper.
Operating principle of hydraulic presses
Hydraulic presses equipped with an electric drive are able to develop enormous pressures, which is explained by the design of such machines. The principle on which the electrohydraulic press works is as follows.
- An electrically powered motor drives a hydraulic pump.
- The hydraulic pump maintains the pressure of the working fluid in the first chamber of the press.
- The piston in the first chamber transmits the pressure to the second cylinder of an electro-hydraulic press where it increases the pressure many times over.
- The pressure generated in the second chamber of the hydraulic cylinder is transmitted directly to the operating element of the electro-hydraulic press.
Frame type hydraulic press diagram (click to enlarge)
Thus, the value of the working pressure to be transmitted to the working body of an electro-hydraulic press, depends on how different the areas of the pistons in its two cylinders. The basis of the work of the press, whose main working body is a hydraulic pump, based on the law of Pascal, which consists in the fact that the force acting on any area, transmitted throughout the entire volume, and it has an equal value in all directions.
Hydraulic cylinders for the press: review, characteristics, features and reviews
An experienced miller can make a hydraulic cylinder himself. The press (homemade), as a rule, is designed for a small load, so first of all for the assembly is chosen a piston of small diameter. Then a trunnion is welded to it.
Sleeves are used to hold the overlay. Next, to make a hydraulic cylinder for the press with your own hands, you need a sleeve. It must be mounted behind the piston. The average rod diameter is 60 mm. If we consider modifications for the drive presses, the end of the cylinders are soldered special couplings.
Homemade electrohydraulic press
The range of applications of hydraulic presses is quite wide: they can be used in machine shops for pressing in and out bearings, gears, shafts, etc.д. They are also used for pressing metal parts, pressing wooden chips, plastic, rubber. Finished machines cost from 100 thousand. In this article, the author describes a fairly budget, and at the same time quality project of the hydraulic press, capable of giving a maximum force of 35 tons per 50 square centimeters. Creation of the machine would require access to the following equipment:. Lathe;. Drilling machine;. Welding machine.
Also require tools such as angle grinder, drill.
The materials required for creation, will be listed in the article itself.
In the process of creating the frame of the machine, it is important to pay great attention to its strength, because it will be exposed to tremendous mechanical stress. The thickness of metal here should be thick enough to withstand the forces given by the hydraulic cylinder and not deflect. The author of the article used a 14 T-beam as the base. U-shaped frame is welded out of it, and the base on which it will stand is made of thinner channels and angles at the bottom.
Approximately in the middle was welded working platform from two thick channels: Originally the author used another attachment for hydraulic cylinder, but it ripped out of the bed, so it was decided to dismantle it and make a new one. Previously the cylinder was just welded to the beam, but now it was decided to put it through the flange on a 20 mm plate. The plate itself will be located on two T-beams.
In order to fit the cylinder in the flange, the cylinder is turned on a lathe.
I made a flange from an automobile hub, and I milled it on the same machine. 20mm thick metal plate was used next. To make a hole for the cylinder, it needs to be somehow secured in the machine. To do this, a round boss is welded to the center of the plate. The plate is fastened in the machine. Next comes the welding work. The plate is welded to the beams: The flange is put on the cylinder, and welded all around: To ensure that the cylinder sits flat, the adjacent surface of the flange is machined on a lathe: The plate with the beams welded to it is set in place and welded: Next, holes are drilled in the plate through which the mounting bolts will pass, following the counter holes in the hub. To ensure that the cylinder is not fixed at only one point, another flange is made, put on top of the cylinder and welded to the beams. The T-beams in the upper part are welded together and the structure is ready. Next, the oil station is installed, the feed hoses and the machine is ready. Source
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Making a jack press with your own hands
Hydraulic press made from a jack is not only a powerful tool used in any production, but a conscious choice of a garage or home handyman, who urgently needed a means to create a multi-ton pressure in a small limited location. The machine will help, for example, when briquetting combustible garbage for burning in a furnace.
Making additional elements
Before you begin to manufacture a hydraulic press with their own hands, you should consider that, in the role of guiding racks must apply sections of metal angle, size 100×100 millimeters, its height must be equal to 1.5 meters.
There should be four of these blanks. These elements should be welded vertically to the steel base, two on each side. The spacing between the adjacent corners must be equal to 100 millimeters, which is necessary for the ends of the working stop of the structure to fit. They must be made of the same width. In the upper area, all the columns must be connected to each other by means of a steel profile welded to them, which must be made to the appropriate size.
The same element will serve as a fixed stop when you make a hydraulic hand press.
How to make a hydraulic cylinder [ DIY ] Subtitles
The main element of the press is a frame, the drawing for which is made in strict accordance with the planned load on this device. The frame is made in the form of a rectangular structure in which a jack is placed with a pressing component that compresses blanks or already milled parts to give them the desired parameters. Design of the bed (frame) differs based on the tasks faced by the worker, whose activity is limited to the use of the press and other mechanisms included in the line of production, where he works.
The main requirement for the base is high resistance to deformation. It is subjected to an increased load without losing its shape in the process.
The expansion is directed in different directions. the jack, working as the main operating mechanism, leans up and down. The breaking action it exerts must be half or three times lower than the safety margin of this structure. Safety margin is a must. without it the entire installation will fail quickly.
The lower part of the frame is manufactured in accordance with the increased stability of the whole frame. The width of the span from the inside is made taking into account the dimensions of the parts and workpieces undergoing machining on the given machine. Last but not least are the overall dimensions of the component parts of the whole unit.
When calculating the height of the internal frame span, add together the height of the jack and the relative height of lift of its pin, the thickness of the workpiece to be pressed, and the main platform. The production of the press can be presented in several steps.
- The jack is placed on the lower base, the workpiece is placed much higher.
- The pressure from the jack piston to the workpiece is exerted through the moving part which actively presses.
The working (moving) part of the press runs on steel guides preventing it from horizontal drifting aside. To return the working part in the unloaded state are used springs, the lower ends of which are hooked to the base, and the upper. to the moving plane. It is necessary to accurately calculate the spring stiffness if you are making the jack yourself: too little will not bring the platform back within the time required, so the manufacturing process will stop for an unnecessary second or minute. Overly stiff spring will require more energy to bring the press to the maximum squeezing condition of the part or workpiece. The springs must actuate clearly and quickly, without delay.
The second method, according to which the press machine is assembled, made by the master with his own hands, consists of several important stages.
- The workpiece is placed on the base from below.
- The jack is placed on a dynamic platform. The springs that connect it to the upper part of the frame are attached to it.
Both methods involve an inlet compartment to which the jack rod is held, as it were, without shifting thanks to the guides. A piece of pipe with an inner diameter almost identical to the diameter of the jack rod. ensuring its entry into this pipe under considerable force, which does not allow it to slip out of it.
It is impossible to adjust the height of the working area. because of this, although the circuit of the unit is simplified in assembly, the scope of its application is considerably narrowed.
A self-made press gets additional functionality and convenience when a craftsman implements in its design the adjustment of the free stroke of the pin. This will allow higher and thicker parts to be machined. The sequence of operations is as follows.
- At the bottom of the frame, within the perimeter of its frame, an additional plane is placed which moves on guides according to a screw drive with a handwheel component. This will greatly expose the free space for the workpieces to be pressed.
- When the first option is not suitable, it is possible to make a detachable stop in the unit, which is, in fact, a removable dynamic platform. Such a stop can be secured by using bolt-on mounts. The frame is subjected to cutting of holes for them. the width of the indentation between two adjacent bolts cannot be changed. The distance between the holes is no greater than the length of the jack pin’s free stroke.
- It is possible to saw spacers of unequal thickness out of a profiled tube or out of a steel bar.
Some or all of these methods are sometimes used in conjunction with one another. When developing your own drawing, please take into account the dimensions of all components in detail, including the rolled steel, used as a consumable for the frame.
The hydraulic machine has an advantage over a purely mechanical. no gearbox, no gears will not keep the force of action with the least losses, which occurs only when using hydraulics. The automotive industry has also proven it: hydraulic braking is much more efficient, the hydraulic system is less subject to wear than a purely mechanical system, while maintaining high efficiency.
Scope and principle of operation
The quality and technical parameters of the press of their own work are not inferior to factory-made models. Therefore, if you want to save the family budget, engage in the creation of such a device with your own hands.
And if you consider the photo of the best ideas, how to make a press, then you will come to the conclusion that the easiest way to make it from a jack.
Use a similar, self-made, unit can be used for such needs as:
- stamping and bending all kinds of objects;
- Forging of metal parts;
- extrusion of steel profiles;
- baling of wooden, plastic and metal products.
The operating principle of the jacking press is based on hydrostatic laws. And it consists in the fact that the pressure on one particular section of the workpiece contributes to increasing the coefficient of performance in the other
Other areas of presses: Hydraulic press for cable lugs
The hydraulic press is widely used for crimping cable lugs for high-voltage lines. With the device the process of mechanical compression of the connection is performed, which after processing will have greater strength, conduct electricity well, not to overheat, which reduces the possibility of damage to the contacts and the emergence of accidents.
Crimping of cable lugs with presses
Manual hydraulic lug press designed to work with cables with a cross section of 5-400 mm². When choosing a tool, it is necessary to take into account some parameters of the device. The press should have a pressure limiting valve. These devices are more reliable, since they prevent exceeding the permissible pressure.
An important criterion is the type of the press head, which can be open or closed. The first option provides more convenient and easy operation in all cable lengths. To work with the press of the closed type it is necessary to open the stopper beforehand, to take out a matrix, to insert a wire and a lug, to close a fixture. Only after such manipulation is crimping the cable.
When choosing a hydraulic press it is important to consider the diameter of the working section of the cable. Depending on this, all models can be divided into types. The PG-70 variant is used for conductors with a cross-section of 4-70 mm². Type PG-120 is designed for cable with diameter of 10-120 mm², PRG-240. 16-240 mm². Hydraulic press PGR-300 can handle cables with cross section of 16-300 mm². Model PG-1000 is designed for wire diameters of 400-1000 mm².
All models of the tool can work with copper or aluminum wires. Many modern devices are equipped with a quick turn mechanism and rotating heads. The KVT hand hydraulic presses of the domestic manufacturer are very popular. This is due to the democratic price of the tool and the high quality of its construction.
Hydraulic presses PG-1000 are used for wire diameter 400-1000 mm²
Important! The set of hydraulic presses KVT includes eight interchangeable matrixes for crimping.