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US 7,927,221 B2Granted
Tool and method for the production of a thread
AssigneeEMUGE-Werk Richard Glimpel GmbH & Co. KG
InventorsHelmut Glimpel, Dietmar Hechtle, Thomas Zeus
Life of this patent
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Abstract
The tool for the chipless production of a thread, in particular for producing an internal thread, is in its forming height, pitch of the pressing lands and/or pressing surfaces adapted to the material of the workpiece in a special manner.
Claims17
Tool for producing a thread using cold forming,
- a) which is rotatable about a tool axis and
- b) comprises a plurality of cold forming pressing lobes which
- b1) are arranged axially offset from one another and
- b2) are intended for cold forming the thread into a surface of a workpiece and
- b3) each comprise a central pressing land which runs in a feed direction of the cold forming pressing lobe relative to the workpiece and forms a pressing lobe region projecting radially furthest to an outside and/or is essentially reproduced on the thread root of the thread produced in the workpiece,
- c) the tool being adapted to the material of the workpiece,
- c1) by virtue of the fact that, at least at some of the cold forming pressing lobes, the radial distance of the pressing land increases monotonically, preferably strictly monotonically, against the feed direction according to a predetermined radial distance function up to a maximum radial distance, and that this radial distance function of the pressing land of each cold forming pressing lobe is selected as a function of the material of the workpiece, and
- c2) by virtue of the fact that the pressing surfaces, coming into engagement or contact with the workpiece, of the cold forming pressing lobes are selected in shape and/or size and/or arrangement as a function of the material of the workpiece,
- d) radial being defined as perpendicular to the tool axis and axial being defined as along or parallel to the tool axis;
- e) wherein, for a predetermined selection of materials of the workpiece, a pitch of the radial extension function of the cold forming pressing lobes, a pitch of the radial distance function of the pressing lands, and the size of the pressing surfaces of the cold forming pressing lobes are in each case subdivided into at least two categories with regard to the values to be set, comprising:
- at least one lowermost category having at least one lowest value or having a lowest value range;
- and
- at least one uppermost category having at least one highest value or having a highest value range.
10 more elements
Tool for producing a thread using cold forming,
- a) which is rotatable about a tool axis and
- b) comprises a plurality of cold forming pressing lobes, which:
- b1) are arranged axially offset from one another;
- and
- b2) are intended for cold forming the thread into a surface of a workpiece;
- and
- b3) each tool comprises a central pressing land which runs in a feed direction of the cold forming pressing lobe relative to the workpiece, and forms a pressing lobe region projecting radially furthest to an outside and/or is essentially reproduced on the thread root of the thread produced in the workpiece;
- c) the tool being adapted to the material of the workpiece;
- c1) by virtue of the fact that, at least at some of the cold forming pressing lobes, the radial distance of the pressing land increases monotonically, preferably strictly monotonically, against the feed direction according to a predetermined radial distance function up to a maximum radial distance, and that this radial distance function of the pressing land of each cold forming pressing lobe is selected as a function of the material of the workpiece;
- and
- c2) by virtue of the fact that the pressing surfaces, coming into engagement or contact with the workpiece, of the cold forming pressing lobes are selected in shape and/or size and/or arrangement as a function of the material of the workpiece;
- d) radial being defined as perpendicular to the tool axis and axial being defined as along or parallel to the tool axis;
- e) wherein, for a predetermined selection of materials of the workpiece:
- the a pitch of the radial extension function of the cold forming pressing lobes, a pitch of the radial distance function of the pressing lands, and the size of the pressing surfaces of the cold forming pressing lobes, are in each case subdivided into three categories with regard to the values to be set, comprising:
- at least one lowermost category having at least one lowest value or having a lowest value range;
- at least one uppermost category having at least one highest value or having a highest value range;
- and
- at least one average or middle or intermediate category having at least one intermediate or average value, or having an intermediate or average.
15 more elements
Dependencies are inferred from the claim text.