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Proper selection and installation of punch press die is not a neglected part of punch press maintenance

Return list Reffer:NITONI Click number:- Release time:2018-10-15

The service life of CNC punch press, in addition to the reasonable mold structure, high manufacturing precision, good heat treatment effect and correct selection of the punch and punch press mold installation accuracy, the correct use, maintenance and maintenance of the mold can not be ignored. In this regard, the following points should be noted:

(1) The mold should be strictly inspected before installation to remove dirt, check whether the guide sleeve and mold of the mold are well lubricated.

(2) Check the turntable of the press and the mold mounting base regularly to ensure the coaxial accuracy of the upper and lower turntables.

(3) Install the male and female molds on the turntable in accordance with the installation procedure of the mold to ensure that the convex and concave molds are in the same direction. In particular, the non-circular and square molds with directional requirements must be carefully designed to prevent wrong loading and reverse mounting.

(4) After the mold is installed, check whether the fastening screws of the mold mounting base are properly locked.

(5) Punching and punching of the punch die should be stopped when it wears, sharpen it in time, otherwise it will rapidly enlarge the wear of the die edge, accelerate the wear of the die, and reduce the quality of the die and die life.

(6) For general-purpose molds used in mass production, there should be backup in order to rotate the production and ensure production needs.

(7) The punching personnel should use the soft metal (such as copper, aluminum, etc.) as the operating tool to install the mold to prevent the mold from being damaged during the knocking or boring during installation.

(8) Handle the mold gently during transportation. Never throw it in disorder so as not to damage the edge and guide of the mold.

(9) After the mold is used, it should be promptly put back to the designated position and used for rust-proof treatment.

(10) To ensure the service life of the mold, the spring of the mold should also be replaced regularly to prevent the fatigue damage of the spring from affecting the mold. Punch mold FAQ

(1) The punch wears too fast

The main reason: 1 mold gap is too small, it is generally recommended that the total mold gap is 20% to 25% of the material thickness. (2) The centering of convex and concave molds is not good, including mold bases, mold guide components, and insufficient accuracy of turret inserts. 3 The punch temperature is too high, mainly due to the overheating of the punch caused by the continuous stamping of the same die for a long time. 4 Inappropriate mold grinding methods cause mold annealing and increased wear. 5 Partial unilateral punching, such as nibbling, punching or shearing, the lateral force will bias the punch to one side, the clearance of the edge decreases, causing serious wear of the mold, if the installation precision of the machine tool is not high, serious The punch will bias the punch through the die, causing the punch and die to be damaged.
(2) mold material problem

The mold material will cause the waste to rebound. The related factors: 1 The sharpness of the cutting edge of the mold, the larger the roundness of the cutting edge, the more likely it will cause the waste to rebound. 2 Incoming moduli of the die, the injecting modulus of each station of the machine tool is certain, the die entering the module is small, it is easy to cause the waste to rebound. 3 whether the mold gap is reasonable, if the mold gap is not suitable, it will easily cause the waste to rebound. 4 whether there are more oil on the surface of the processed plate. 5 Spring fatigue damage.

To prevent the mold material: 1 Use a special anti-material die. 2 The mold is often sharpened sharply and demagnetized. 3 Increase the die gap. 4 The inclined edge die is used instead of the flat edge die. 5 mold installation remover. 6 increase the mold's modulus. 7 Check the fatigue strength of the mold spring or unloading sleeve.

(3) mold neutrality problem

In the use of the mold, it is easy to have different wear amount on each side of the punch core, some parts have large scratches, and the wear is fast. This is particularly evident in narrow rectangular molds. The main reasons for this problem are as follows: 1 The design precision of the turret or machine tool is not sufficient, mainly because the centering of the die mount of the upper and lower turntables is not good. 2 The design or machining accuracy of the mold cannot meet the requirements. 3 The precision of the guide bush of the die punch is not enough. 4 mold gap is not suitable. 5 The mold mount or mold guide sleeve is not neutral due to long-term wear.

In order to prevent inconsistent mold wear, it should: 1 Regularly use the centering rod to perform neutral inspection adjustments on the machine turret and mount. 2 Replace the mold guide bushes in time and use the convex and concave molds with proper clearance. 3 using full-lead mold. 4 Strengthen the sense of responsibility of the operators, find the reasons in time after discovery, and avoid causing greater losses.

(4) Use of special forming dies

In order to meet production needs, it is often necessary to use forming dies or special dies, mainly including bridge dies, shutter dies, counterbore dies, tapping tapping dies, boss dies, drawing dies, and modular dies. Forming dies can greatly increase production efficiency, but the forming dies are expensive, usually 4 to 5 times that of ordinary dies. To avoid mistakes, the following principles should be observed and adhered to:

1 When the mold is installed, check the direction to ensure that the convex and concave molds are installed in the same direction.

2 According to the requirement, adjust the stamping depth of the mold correctly. It is better not to exceed 0.15mm for each adjustment.

3 Use a lower punching speed.

4 Plates should be flat without distortion or tilting.

5 The forming position should be as far away as possible from the clamp.

6 Forming dies should avoid downward molding operations.

7 Press the first common mold stamping, and finally use the forming mold.

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