Process and device for producing phillips-head screwing tools or the like, especially in the form of bits
AssigneeWera Werk Hermann Werner GmbH & Co.
InventorWerner Godtner
Life of this patent
Estimating the term…
Abstract
A process for producing Phillips-head screwing tools or the like, especially in the form of bits, by cold forming from a workpiece section (W) cut to length from a profiled rod. In order to produce bits of high precision, that the workpiece section (W) which is developed at one end with a hexagon profile and adjoining it with a section with supportable front end (16) is introduced, with axial spring-loaded support, into a press tool (P), whereupon the cheek plates (51) of this press tool (P) produce the Phillips-head shape or the like by a displacement towards the center which is controlled by a conical envelope surface (55) which tapers towards the front end (16).
Claims21
A process for producing Phillips-head screwing tools and the like, particularly in the form of bits, by cold forming of a workpiece section which has been cut to length from a profiled rod, comprising the steps of:
- developing the workpiece section at one end with a hexagonal section having a profile of a hexagon and adjoining same with a cylindrical section with a supportable front end opposite said one end, and
- introducing the workpiece section into a press tool, and providing a first axially resilient support at said one end at an end surface of the hexagonal section and a second axially resistant support at the supportable front end, spring force of said first resilient support differing from a spring force of said second resilient support, whereupon cheek plates of said press tool effect forming to the Phillips-head profile and the like by a displacement towards a center which is controlled by a conical envelope surface which tapers towards the front end, both of said axially resilient support compensating for axial distension of the workpiece section resulting from displacement of the cheek plates.
A device for producing Phillips-head screwing tools and the like particularly in the form of bits by cold forming from a workpiece section which has been cut to length from a profiled rod, is provided at a front end of the workpiece with a conical envelope surface, and is provided with a hexagonal section opposite said conical envelope surface, comprising a press tool having cheek plates effecting forming of a Phillips-head profile and the like by a displacement towards a center of the workpiece section, the displacement being controlled by the conical envelope surface which tapers towards the front end of the workpiece section, the device further comprising
- a carriage and die of said press tool, both said carriage and said die of said press tool having a first and a second stop, respectively, spring-loaded in directions towards each other, and
- wherein the first stop of the carriage serves as a support at an end surface of the hexagonal section of the workpiece section, and the second stop serves to support the front end of the workpiece section;
- and
- said first stop has a first axially resistant support and said second stop has a second axially resistant support, a spring force of said first resilient support differing from a spring force of said second resilient supports, both of said axially resistant supports compensating for axial distension of the workpiece section resulting from displacement of the cheek plates.
Dependencies are inferred from the claim text.