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Shanghai Jiasheng Powder Metallurgy Co., Ltd.
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Product (85)
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Shanghai Jiasheng Powder Metallurgy Co., Ltd. [China (Mainland)]
Business Type:Manufacturer
City: Shanghai
Province/State: Shanghai
Country/Region: China (Mainland)
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shanghai Jiasheng:
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1.Complete spheres should not be attempted because the punches required to form them would have to be feathered to zero. The problem can be address by adding a straight or flat area around a major diameter so the punch can have a "flat" at its tip. Components that must fit into ball sockets may then be repressed or machined after sintering to remove the "flats". Hemispheres, such as those used in ball joints, can be readily compacted.
1.Complete spheres should not be attempted because the punches required to form them would have to be feathered to zero. The problem can be address by adding a straight or flat area around a major diameter so the punch can have a "flat" at its tip. Components that must fit into ball sockets may then be repressed or machined after sintering to remove the "flats". Hemispheres, such as those used in ball joints, can be readily compacted.
2.Thickness-Minimum wall thickness depends upon the overall component size and shape. For components of any appreciable length, all thickness should be at least 0.050 in. (1.3 mm) thick. Thinner walls are possibly, but only with very short parts. Where the ratio of length-to-wall thickness is 7:1 or more, care must be taken to ensure uniform fill. Variations in Density are virtually unavoidable in that type of situation and the tooling required for long, thin walls is quite fragile with low life expectancy.
3.Steps-Simple steps or levels not exceeding 15% of the overall component length and with adequate draft angles can often be formed in face contours in the punches. Features such as countersinks and counterbores can be similarly formed. This design will produce variations in density from level to level, but this approach requires simple tooling. The end result is lower tooling costs and closer axial tolerance.
If uniform density is required in a part with pronounced level variations, a more complex, multi-motion tool must be produced. Sophisticated compacting equipment, which moves tooling components independently, is used to transfer the metal powder axially before compacting begins, to develop more uniform density.
Components with 4 or more levels can be produced with a minimum of density variation between the various levels. If your design requires this type of part, please contact PMCo early in the design phase and we will advise you on how to control component and tool costs.
Components with 4 or more levels can be produced with a minimum of density variation between the various levels. If your design requires this type of part, please contact PMCo early in the design phase and we will advise you on how to control component and tool costs.
The minimum preferred width for each step ( difference in radial dimension), for multiple-motion tooling should be 0.060 in. (1.5mm) so that the punches will have adequate strength.
Projections with large cross sections, formed in short steps, may crack on ejection particularly when joined to long (axial direction) features. The projections should be as thick as possible, with radii at the junction.
The minimum preferred width for each step (difference in radial dimension), for multiple-motion tooling should be 0.060 in (1.5mm) so that the punches will have adequate strength.
You can readily press text, logos or graphics into surfaces oriented perpendicular to the direction of pressing. The letters or graphics should
be embossed into the surface rather than raised. Raised elements are subject to damage during green stage and make it difficult to stack parts for sintering. If a secondary coining operation is required for the other purposes you can also elect to add these elements as part of the coining process.
The minimum preferred width for each step (difference in radial dimension), for multiple-motion tooling should be 0.060 in (1.5mm) so that the punches will have adequate strength.
You can readily press text, logos or graphics into surfaces oriented perpendicular to the direction of pressing. The letters or graphics should
be embossed into the surface rather than raised. Raised elements are subject to damage during green stage and make it difficult to stack parts for sintering. If a secondary coining operation is required for the other purposes you can also elect to add these elements as part of the coining process.
Tapers and drafts- Draft is not generally required or desired on straight- through components. While tapered side walls can be produced where required, production speed can be reduced to avoid powder wedging between the die taper and lower punch during the fill operation. Sometimes draft is required for flanged or embossed parts. Tapered sections usually require a short non-tapered surface on either side to prevent the upper punch from running into the taper in the die wall or on the core rod.
Flanges- A small flange, step, or overhang can be produced by a shelf or step in the die. Additional punches and other tooling techniques are required when the amount of overhang becomes too great to permit ejection without breaking the flange. If a stepped die is used, several features are usually required to facilitate ejection and minimize the possibility of chipping the component:
Draft around the flange
A radius around the bottom edge
A radius at the juncture of the flange and body of the component
Tapered holes can be formed, but a short length must be straight to accommodate the punch. Side holes, or holes not parallel to the direction of pressing, cannot be made in the pressing operation and are generally produced by secondary machining.
Through Holes in the direction of pressing are produced with core rods extending up through the tools. Round holes use the least expensive tooling, but other shaped holes such as splines, keys, keyways, D-shapes, squares and hexagons, can be produced with very little added tooling cost. Blind holes, blind steps in holes, and tapered holes, which are usually difficult to machine, are also readily pressed.
The following guidelines apply to the design of blind holes formed by contours in the punch faces:
- • The blind end should not be opposite a flange
- • A short counterbore can be formed on the flanged end (or at either end if there is no flange) provided that:
- • The cross section area of the counterbore does not exceed 20% of the total cross section area.
- • The depth does not exceed 25% of the total component length
- • A minimum taper of 10° to 12° is provided
- • Lightening holes are frequently used in large components to reduce effective pressing area, reduce weight, and lower pressing force. In most cases, these advantages offset added tool cost, especially when the holes are round.
Tapered holes can be formed, but a short length must be straight to accommodate the punch. Side holes, or holes not parallel to the direction of pressing, cannot be made in the pressing operation and are generally produced by secondary machining.
