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US 4,260,346 AGranted
Press assembly for powder material
OwnerRaymond B. Anderson, Jr., Aksel S. Jenseninventors
Life of this patent
Estimating the term…
Abstract
The present invention is directed to an improved powder press assembly of the withdrawal die type that is capable of subjecting the frame and die set to only compressive forces while accurately maintaining the dimensions of a compacted part. Mechanical stops are provided in upper and lower ram assemblies and cooperate with a multifunction push rod assembly to provide bilateral press position. The high and low pressure hydraulic system provides an economical use of the power requirements and further includes a bypass valve in a main pressure cylinder to accommodate rapid movement of the upper ram assembly.
Claims39
An improved press assembly capable of forming parts from compactible powder with the use of an upper punch holder, a movable die holder assembly and a fixed lower punch assembly comprising,
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch holder;
- a lower ram assembly relatively movable to the stationary support assembly having a second mounting means for connection with a movable die holder assembly;
- third mounting means on the stationary support assembly for connection with a fixed lower punch assembly;
- first power means operatively connected to the upper ram assembly for exerting a compressive force in a vertical direction;
- a push rod assembly mounted on the upper ram assembly having a pair of push rods hydraulically mounted for relative movement to the upper ram assembly, and
- push rod control means respectively, positioning the push rods at a predetermined position relative to the upper punch holder for providing a prepress movement of the die holder, providing a positive mechanical stop during the final press compacting of the part and pushing the die holder vertically downward relative to the fixed lower punch assembly during ejection of the formed part.
4 more elements
A hydraulic press assembly capable of forming parts from compactible powder comprising:
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch holder;
- a first source of high pressure hydraulic fluid;
- a first power means operatively connected to the upper ram assembly and the high pressure source for exerting a principle compressive force during compaction of the powder into a part;
- a second source of relatively lower pressure hydraulic fluid;
- a second power means operatively connected to the upper ram assembly and the lower pressure source for exerting an auxiliary force on the upper ram assembly;
- a lower ram assembly relatively movable to the stationary support assembly having a second mounting means for a movable die holder assembly that is selectively engageable with the compressive force of the first power means for downward movement;
- third mounting means on the support assembly for a fixed lower punch assembly, and
- means for permitting countermovement of the first mounting means relative to the movable die holder assembly prior to ejection of the formed part while permitting the first power means to exert a unidirectional compressive force stroke during a pressing and ejection cycle of part formation, the upper ram assembly, movable die assembly and fixed lower punch assembly only being subjected to compressive forces during the compressive stroke of the first power means.
6 more elements
A hydraulic press assembly capable of forming parts from compactible powder comprising;
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch holder;
- a lower ram assembly relatively movable to the stationary support assembly;
- a first hydraulic power means operatively connected in the upper ram assembly for exerting a compressive force through the upper ram assembly including a source of hydraulic pressure, a power cylinder and a piston assembly, the piston assembly having a bypass valve within the cylinder to pass fluid from one side to the other side of the piston assembly;
- a movable die holder assembly selectively engaging with the compressive force of the first power means for downward movement and having a second mounting means for connection to the lower ram assembly;
- a fixed lower punch assembly having a third mounting means capable of connection to the stationary support assembly, and
- means for permitting countermovement of the first mounting means relative to the movable die holder assembly prior to ejection of the formed part while permitting the first power means to exert a unidirectional compressive force stroke during a pressing and ejection cycle of part formation, the upper ram assembly, movable die assembly and fixed lower punch assembly only being subjected to compressive forces during the compressive stroke of the first power means.
4 more elements
A hydraulic press assembly capable of forming parts from compactible powder comprising:
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch holder;
- a first hydraulic power means for exerting a compressive force through the upper ram assembly including a source of hydraulic fluid pressure, a power cylinder and a piston assembly, the piston assembly having means to bypass fluid within the cylinder from one side to the other side of the piston assembly;
- second mounting means on the support assembly for mounting a fixed lower punch assembly, and
- means for permitting countermovement of the first mounting means relative to the lower punch assembly prior to ejection of the formed part while permitting the first power means to exert a unidirectional compressive force stroke during a pressing and ejection cycle of part formation.
2 more elements
A press assembly capable of forming parts from compactible powder comprising;
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch;
- a first power means operatively connected to the upper ram assembly for exerting a compressive force in a vertical direction;
- a first stop assembly adjustably mounted between the first power means and the first mounting means including a first and second stop member mounted for vertical relative movement;
- means for initially relieving stress between the first and second stop member prior to significant movement in a vertical direction;
- a lower ram assembly relatively movable to the stationary support assembly having a second mounting means for a movable die holder assembly that is selectively engaged with the compressive force of the first power means for downward movement;
- means on the stationary support assembly for mounting a fixed lower punch assembly, and
- means for permitting countermovement of the first mounting means relative to the movable die holder assembly prior to ejection of the formed part while permitting the first power means to exert a unidirectional maximum compressive force stroke during a pressing and ejection cycle of part formation, the upper ram assembly, movable die assembly and fixed lower punch assembly only being subjected to compressive forces during the compressive stroke of the first power means.
5 more elements
A hydraulic press assembly capable of forming parts from compactible powder with the use of a removable withdrawal type die set assembly including an upper punch holder, a movable die holder assembly, and a fixed lower punch assembly, comprising:
- a stationary support assembly;
- an upper ram assembly relatively movable to the stationary support assembly having a first mounting means for an upper punch holder;
- a lower ram assembly relatively movable to the stationary support assembly having a second mounting means for connection with a movable die holder assembly;
- third mounting means on the stationary support assembly for connection with a fixed lower punch assembly;
- a first power means operatively connected to the upper ram assembly for exerting a compressive force in a vertical direction;
- a first and second stop assembly each capable of providing bi-level positioning with an intermediate abutment and a final abutment position, the first stop assembly is mounted between the first power means and the first mounting means while the second stop assembly is mounted between the stationary support assembly and the second mounting means whereby predetermined stop positions can be provided during pressing, and
- means for permitting countermovement of the first mounting means relative to the movable die holder assembly prior to ejection of the formed part while permitting the first power means to exert a unidirectional compressive force stroke during a pressing and ejection cycle of part formation, the upper ram assembly, movable die assembly and fixed lower punch assembly only being subjected to compressive forces during the compressive stroke of the first power means.
4 more elements
Dependencies are inferred from the claim text.