Production method for a semi-finished product and semi-finished product

• US 9,718,115 B2
• Filed: 07/14/2011
• Issued: 08/01/2017
• Est. Priority Date: 07/14/2010
• Status: Active Grant

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Selb, Michael, Wissling, Matthias, Kueper, Armin
• Primary Examiner(s): Jones, David B
• Application Number:
  US13/809,771
• Publication Number:
  US 20130115025A1
• Time in Patent Office: 2,210 Days
• Field of Search: 72 103, 72 77, 72100, 72110, 72197, 72234, 723702, 470 8, 470 10, 470 12, 470 57, 470 66
• CPC Class Codes: B21B 1/16 for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
• CPC Class Codes: B21B 1/18 in a continuous process
• CPC Class Codes: B21B 47/00 Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal soaking pits C21D9/70
• CPC Class Codes: B21H 1/20 rolled longitudinally
• CPC Class Codes: B21H 1/22 characterised by use of rolls having circumferentially varying profile ; Die-rolling
• CPC Class Codes: B21H 3/02 external screw-threads ; Making dies for thread rolling
• CPC Class Codes: B21H 3/022 combined with rolling splines, ribs, grooves or the like, e.g. using compound dies
• CPC Class Codes: F16B 35/00 Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws F16B33/008 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275; using screws with adjustment sleeves F16B5/0283; thread cutting screws F16B25/00

Abstract

The production method according to the invention for creating a thread in an elongated semi-finished product comprises the following steps: shaping, especially lengthwise rolling, of at least two lengthwise grooves into a blank and lengthwise rolling of a thread into the areas circumferentially delimited by the grooves. The distance from the beds of the grooves to the axis of the blank is smaller than the distance from the root of the thread to the axis.

Claims

1. A production method for creating a thread in an elongated semi-finished product, comprising the following steps:

shaping at least two lengthwise grooves into a blank and lengthwise rolling a thread into areas circumferentially delimited by the grooves, a distance from beds of the grooves to an axis of the blank being smaller than a distance from a root of the thread to the axis;

wherein the blank is conveyed along a direction of movement and rollers that serve to shape the thread rotate around a rotational axis perpendicular to the direction of movement.

2. The production method as recited in claim 1 wherein, in the case of a number N of grooves, the rollers are rotated with respect to the grooves around the axis by a quotient of 180°

relative to the number N.

3. The production method as recited in claim 1 wherein a lateral edge of a roller profile of one of the rollers is moved in a plane with the axis and with one of the grooves.

4. The production method as recited in claim 1 wherein the rollers surround the blank annularly.

5. The production method as recited in claim 1 wherein the at least two lengthwise grooves are formed parallel to the direction of movement.

6. The production method as recited in claim 1 wherein four of the rollers serve to shape the thread.

7. The production method as recited in claim 6 wherein each of the rollers completely covers an annular section located between two of the grooves.

8. A production method for creating a thread in an elongated semi-finished product, comprising the following steps:

shaping at least two lengthwise grooves into a blank and lengthwise rolling a thread using rollers into areas circumferentially delimited by the grooves, a distance from beds of the grooves to an axis of the blank being smaller than a distance from a root of the thread to the axis wherein a lateral edge of a roller profile of one of the rollers is moved in a plane with the axis and with one of the grooves.

9. The production method as recited in claim 8 wherein the rollers surround the blank annularly.

10. The production method as recited in claim 8 wherein the at least two lengthwise grooves are formed parallel to the direction of movement.

11. The production method as recited in claim 8 wherein the at least two lengthwise grooves are formed parallel to the direction of movement.

12. The production method as recited in claim 8 wherein four of the rollers serve to shape the thread.

13. The production method as recited in claim 12 wherein each of the rollers completely covers an annular section located between two of the grooves.