The use and maintenance of CNC Stamping machine

Current, in the field of sheet metal stamping, CNC turret punch press with its fast punching speed, high precision machining, mold versatility, flexible product characteristics are widely used. CNC turret punch mold, stamping speed, high accuracy and quality requirements.User in the purchase of a certain quality mold, the level of use and maintenance, directly affecting the quality of machining of the work piece and the life of the mold. The mold is also an important part of the running costs control equipment. Therefore, to learn and master some knowledge and applied to practice to improve efficiency, reduce costs, and will also play an important role.

  Discussed below CNC turret punch mold should be followed in the use and maintenance of a number of technical points, and put forward the corresponding solutions for practical problems, likely has a good role in guiding the user.

, To ensure the best die gap

  Die gap means to punch into the lower mold, and both sides of the gap. It is related to the thickness, material as well as stamping process, the appropriate choice of die clearance, to ensure good quality of punching, reduce burrs and collapse, maintain a flat sheet, effectively prevent the belt material to extend the life of the die.

  Check stamping waste, it can be determined whether the die gap suitable. If the gap is too large, the waste will fracture surface roughness and small shiny surface. The greater the gap, the greater the fracture surface and the angle formed by the shiny surface of the bead is formed when the punching and fracture, even a thin edge protrusion. Conversely, if the gap is too small, the waste will appears the fracture surface of the small angle and large shiny surface.

  Notching, nibbling, shearing and other local punching, lateral force will punch deflection and cause unilateral gap is too small, sometimes blade edge offset Assembly scratches to the lower die, resulting in rapid wear of the upper and lower mold.

  Mold to the optimum gap when punching, the fracture surface and the shiny surface of the scrap has the same angle and overlap each other, so that the punching force can be minimum, the punching burr is also small.

Timely sharpening can effectively extend the life of the mold

  If the workpiece is large burr or stamping abnormal noise may be passivated mold. Check the punch and lower die when its edge wear arc radius of about 0.10mm, we must sharpening.

  Practice often trace sharpening, rather than wait until Unground not re-sharpening, will not only maintain a good quality of the workpiece is reduced blanking force, and extend the life of the die can be more than doubled.

  In addition to know the mold when sharpening is particularly important to master the correct method of sharpening. Mold sharpening procedures are as follows:

1) sharpening punch vertically within the V-groove sandwiched plane magnetic grinding chuck or fixture, each grinding amount of 0.03 ~~ 0.05mm repeated grinding until the punch is sharp, the maximum grinding amount generally 0.1 to 0.3 mm.

2) the use of sintered alumina grinding wheel, the hardness D ~~ J, the abrasive grain size of 46 ~ 60, preferably selected applicable to high-speed steel grinding wheel.

3) When the grinding force large or mold near the wheel, add coolant to prevent mold from overheating and cracking or annealing, selection of high-quality multi-purpose coolant should be in accordance with the manufacturers requirements.

4) grinding wheel down into the knife amount of 0.03 to 0.08mm infeed to the amount of 0.13 ~~ 0.25mm cross feed rate of 2.5 ~ 3.8m/min.

5) Sharpening oil stone polished edge, burr, and grind a radius of 0.03 ~ 0.05mm rounded edge crack, can prevent.

6) punch demagnetization process and sprayed with a lubricant to prevent rust.

  Third, eliminate and reduce the sticky material

  Due to the pressure and heat when the stamping will plate material fine particles adhered to the surface of the punch, resulting in poor quality punching. The removal of adhesive material can be used a thin whetstone grinding, polishing the direction should be the same as the direction of movement of the punch, so that light will avoid the generation of the further viscous material. Do not use coarse gauze polished, so as to avoid the rough surface of the punch, more prone to sticky material.

  Reasonable mold gap, the stamping process, as well as the necessary sheet lubrication will reduce the generation of the sticky material. Prevent overheating, general lubrication, this will reduce the friction. If you can not lubrication or waste rebound may take the following methods:

  Alternately using a plurality of the same size punch turns stamping allows it to have a longer cooling time before being reused.

  Stop the overheating mold used. Be programmed to control other mode, to interrupt long duplication of work, or to reduce its stamping frequencies.

, Punch a lot of holes to prevent the sheet deformation measures

  If you punch a lot of holes in a board, because the punching stress accumulated sheet can not be kept flat. Each punching holes surrounding material is deformed downward, causing the material on the surface of the plate to tensile stress, while the lower surface of the compressive stress appears. For a small amount of punching, its impact is not obvious, but when punching the number increases, the tensile and compressive stress accumulated somewhere until the material deformation.

  A method to eliminate such deformation is: first every punching a hole, and then returns punching remaining holes. Although this will produce stress, but it alleviate the stress accumulated in the order in the same direction when punching, also make before and after the stress of the two sets of holes offset each other, thereby preventing the deformation of the plate material.

  Avoid punching too narrow strip

  Molds for sheet metal punching width less than the plate thickness, due to the lateral force of the punch bending deformation, so that one side of the gap is too small or wear exacerbate serious scratching the lower die, so that the upper and lower mold damage.

  Not recommended nibbling narrow strip of sheet width of less than 2.5 times the sheet thickness. Shear too narrow strip, sheet would tend to bend into the lower die opening, rather than being completely cut off, or even the side of the wedging the die. If you can not avoid the above situation, it is recommended to use a stripper hedge head support-oriented mold. , Punch surface hardening its Scope

  Although the heat treatment and the surface coating may improve the surface characteristics of the punch, but not the solution to the stamping parts problem and the general method to extend the life of the die. Generally, coating improves the lubricating properties of the surface hardness and to the side of the punch is improved, but when large tonnage, hard material stamping, these advantages disappear in about 1000 times stamping tools after.

VI can be used for surface hardening of the punch:

  Punch soft or viscous materials (such as aluminum);

  Punch thin abrasive material (such as glass epoxy sheet);

  Punch thin hard material (such as stainless steel);

  Frequent point of red;

  The non-normal lubrication situation.

  The surface hardening is usually titanium, nitriding, etc., the surface-hardened layer of the molecular structure of the thickness of 12 ~ 60 μ m, which is a part of the punch base, and not only is the coating.

  The surface hardening of the mold can be the usual way sharpening. Will reduce the wear of the mold punch the stainless steel plate when hardened by the surface, but does not extend its service life, appropriate lubrication, timely sharpening and operate according to rules, but it is an effective method.

  Seven, the punch die bit of neutral bad overhaul

  The punch die bit neutral bad, caused by the mold quickly passivation workpiece quality in respect of the following overhaul:

  Check the machine level, if necessary, re-adjust;

  Check and lubricate the die hole on the dial and guide key, timely repair any damage;

  Clean dial mold base, so that the lower mold accurate installation, and check its key or keyway wear and replace if necessary;

  Use the special mandrel calibration tool stations timely adjustments, if any deviation.

  The above content is often the case, in view of the specific type of punch and die specifications differ, the user but also with the actual understanding and sum up experience, play the best use of the performance of the mold.