Pour Method Definitions Features You Metal Stamping Dies Article

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Pour Method Definitions Features You Metal Stamping Dies

A method for improving the release characteristics and finishing of metal stamping dies, including the bombing of the interior walls of the mold cavity with a substantially spherical shot with a hardness value at least equal to the die cavity walls hard.

Author: Aixiaoyang

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To optimize the cleaning process parameters such as intensity and type of Almen, size, hardness and consistency, maximizes improved release characteristics and finishing industry. Optionally, the initial blast followed by a second explosion substantially spherical glass beads. Metal stamping dies blasting according to the substantial improvement of the method must demonstrate the relevance of his release and finish characteristics unpeened dies.

The present invention relates to metal stamping dies, especially to a method of improving the release and finish characteristics of metal stamping dies blasting.

The use of metal stamping to produce a wide variety of metal parts is widespread. Although there are variations in metal stamping, such as training, drilling, stamping and the like and combinations thereof, and various types of OFDI single and multiple cavity dies and progressive dies, most of the principles and techniques are the same. The problems are often the same.

A major problem that is common to almost all involvingdrawing metal molding or deformation of the workpiece, the workpiece contacts the interior walls are slit die during the molding operation, is a bad trip curve between the workpiece and die Cavity walls . Poor editing functions, as well as problems whichcauses molding during the descent and ascent, and during removal of the piece inevitably leads to problems such as jamming of the machine or smashups, parts distorted and irregular, and the poor finishing of the piece is to die surfaceproximal Walls double-wall, such as scratches, bruises, marking a location at random shiny and so on. Although most of a trip curve due to bad poor finishing, bad finish can also be caused by other factors, such as heatbuildup, improper lubrication, surface defects, and so on.

Due to the high costs of rejected parts and downtime due to die maintenance and repair, and the high potential costs of failure of a machine or jam or die smashup, are constant efforts to improve properties releaseand finished metal stamping dies. These efforts will vary the material composition of the industry for coating the interior walls of the mold cavity with mold release agents, plating, etc.. Even the attempt toimprove designer died during the release and finish characteristics is experimenting with variations of angles of project, etc..

Although there has been a steady improvement over the years, is a continuing need for improvement in particular the improvements that are economical, reliable and durable.

This invention was the result of a surprising discovery that the shot peening of metal stamping dies generally spherical version greatly improved and finishing capabilities, such as death, life and much increasingdie. Again, the norm in mold construction and maintenance and repair of a statement satisfactory and finishing capabilities, has been to provide the inner walls of the mold cavity with a smooth and uniform as possible surfaceas. Although shot peening is widely used for many years to increase the fatigue life and prevent stress corrosion cracking of metal parts, irregular surface hammered interior walls of the cavity of the die would be expected to release affectthe negative and finishing capabilities are dying.

Since no improvement in the lives of fatigue or prevention of stress corrosion cracking by shot blasting would not be worth the sacrifice of having to accept the release and features poor finish blasting the industry has never been seriously considered for the treatment of interior walls of the cavity mold metal stamping dies.

The broader aspects of the invention, the conventional shot peening techniques and equipment used, ie, the surface is bombarded by blasting equipment under controlled conditions. Preferredembodiment However, optimal results are achieved by using special combinations of parameters for the type of shot, the size, hardness and intensity of peening Almen. Examples of suitable devices include conventional blasting air-blowing whichpropel blow under the pressure of the media using the aspiration, direct pressure or gravity feed, and airless centrifugal wheel or a device to push the shot into the middle part of a wheel in motion. Even free-fall peeningmachines a shot of the media has fallen in part, different selected heights.

As for media blasting, the media must be substantially spherical. Irregular, angular or abrasive media, which is used in sand blasting and sanding are unacceptable in the method of the present invention. While the media generally spherical avariety blasting can be used, such as steel shot, ceramic media and conditioned cut wire shot, steel shot is preferred. If phone call cut, it must be conditional before use, for example by sandblasting itagainst a steel plate until the particles are rounded. Whatever the blasting media is selected, it must have a hardness value at least equal to the hardness of the die cavity walls to achieve improvements in the method of the present invention.

The cleaning process is carried out under conditions substantially 100% coverage and saturation of the inner walls of the mold cavity. Furthermore, we found that increasing the depth of the compressive stress layerprovides improvement. A substantial improvement, especially in life dies, is reached when the layer of compressive stress is about 0.02 cm or more. This increase in die life is due in part to the fact that certain metal surfaces is becoming routine maintenance or refurbishment removedduring operation. Therefore, the greater the depth of the compression stress, the greater the amount of metal that can be removed during maintenance and overhaul of the benefits before explosions ofThe canceled.

Optimum peening intensity varies with the hardness of death and the type metal matrix. Almen intensity generally accepted standard shot peening, which was developed by General Motors Research LaboratoriesDivision General Motors Corporation, the explosion variables are integrated into a single scale of measurement, specification and doubling the peening intensity and results. All measurements are made in standard Almen Gage No. 2, as shown in the SAE Handbook blasting, AMS 2430 and MIL-S 13165. Although the exact intensity varies Almen optimal material pulled the chain and the parameters vary, we found that when the hardness of steel to stabilize the camera with a Rockwell of C45 hardnessof to C55 above, is used, the desired layer under compressive stress at least about 0.02 inches will Almen intensities of about 0.004 to about 0.014 C2.

Also, while the optimal size of blasting media vary, steel shot with a size of about 70 to Mil Spec SAE SAE 230 is preferred for most applications. For optimum reliability and consistency of media blasting, cast steel shot are certified to MIL Spec 13165 preferred.

Finally, we found that further improvements are still following the tee shot with a stream of second explosion substantially spherical glass beads. The procedure is an optional feature acleaning main blast and improves the uniformity of the surface of the jet died.

The improvement is achieved in the press die and the characteristics of arrival of this method is consistently and dramatically over a wide range of different constructions doors. One of the clearest improvements gauges is to monitor the frequency of diecleaning and renovation is necessary. Comparison tests between the treated die and die by blasting in accordance with the present invention at various work stations drawing an automobile assembly plant revealed a major improvement consistent with blast dies. Steel door wide range small compared to the quarter fender steel door posts, the results are the same. The blast dies much less experienced the time and required much less maintenance and periodic reconditioningoperations. The improvement according to the reduced downtime and periodic maintenance and rehabilitation varies by a factor of several times a factor of more than 30 years.

In addition, the surface finish punching andfree consistently uniform from his mistakes.

In addition to the improvements that the present method provides for the release and finishing characteristics and reduction of downtime and the need for regular maintenance and repair, additional benefits are obtained. Costwise, the current method is cheaper than most other surface treatments and coatings on the interior walls of the mold cavity. In addition, further savings made during the repair or alteration die. Coatings such as asplating tend to chip and flake and eventually be replaced by high costs. In the event that the door needs to change due to technological change or otherwise, or require a repair operation, such as welding, the repair may require immediate alteredor Regional repeening. In contrast, in most cases such a modification or repair isolated in a golden death, the entire surface of the die to be reseeded.

Thus, a surprising discovery that the peening of metal stamping dies in accordance with the present method significantly improves release and finishing capabilities, rather than harm them would have predicted, led to asimple, reliable and inexpensive method that can be beneficial for 'Full metal stamping industry.

About Author

http://www.dlhardware.net/News_03.html

Qingdao D&L Hardware Ltd is a manufacture of trailer parts, jockey wheel, stamping tooling, stamping die.

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