DE102009032126A1 - Tubular shaft for deep hole drill, comprises asymmetric front portion and symmetrical rear section, where symmetrical section is formed, and tubular shaft is made both in one piece and two pieces - Google Patents

Abstract

The tubular shaft (1) comprises an asymmetric front portion (6) and a symmetrical rear section (7), where a symmetrical section is formed. The tubular shaft is made both in one piece and two pieces, and is provided with one or multiple chip spaces. The shaft is made of different materials, such as heat-treated steel, high speed steel, carbide, ceramics or carbon fiber composites. An independent claim is also included for a method for manufacturing a deep hole drill shaft.

Description

The Invention relates to the embodiment and production of drilling shafts, as to the use of the in particular single-lip drill and generic drilling tools be used.

State of the art

Usually, the chip space 5 of the drill shaft 1 designed so that it resembles the profile of the drill head. The chip surface of the drill head must be at full drilling by a certain amount 13 over the central axis 4 walk. To guarantee undisturbed chip evacuation, the rake face must be 3 also be above the central axis at the transition from the drill head. In the drilling shafts known from the prior art is the rake face 3 over the entire Spanraumlänge 10 over a certain amount 13 above the central axis 4 ,

• 1. Trennen der in handelsüblichen Längen von 3–7 Meter langen Weichrohrstangen in die gewünschte Schaftlänge.
• 2. Verformen der getrennten Weichrohre vorwiegend in zweiteiligen Ziehschienen oder selten in einer Ziehschale.
• 3. Vorrichten
• 4. Härten der einzelnen Weichrohre kapazitiv oder induktiv.
• 5. Fertigrichten

This has the consequence that the asymmetric drill shank is distorted and bent in two directions during deformation and tempering. He is prepared before hardening. The drilling shafts are manufactured in the following order:

• 1. Separate the commercially available lengths of 3-7 meters long soft tube rods in the desired shaft length.
• 2. Deformation of the separated soft tubes mainly in two-part drawing rails or rarely in a drawing tray.
• 3. Prepare
• 4. Hardening of the individual soft tubes capacitive or inductive.
• 5. Finishing

There is separated first, fall in all subsequent operations many Secondary employment at. Furthermore, it must be prepared before hardening.

At the Pre-curing before curing and later Finishing must be the drill shank due to its asymmetrical Shape in big Dimensions in be directed in both directions. This process is done manually Toggle presses made and requires a high level of craftsmanship Skill of the judge.

Of others have to when drilling the support elements be adjusted asymmetrically to the drill shaft. Accidentally wrong Assembly of the support elements is not uncommon and can be used for Failure or breakage of the tool lead.

task

• 1. Verformen mit Ziehschale und Verformrolle
• 2. Härten
• 3. Trennen
• 4. Fertigrichten

The invention is therefore the object of the chip space 5 of drill shank 1 in such a way that it fits on the one hand, as in the type described above on the drill head, on the other hand on the remaining Spanraumlänge 7 is formed symmetrically. This is achieved by being deformed only in drawing shells, whereby the drawing shell must change to deformation roll during deformation in 2 axes. Further task was the reduction of the secondary activity times in the production process. By changing the order of manufacture, in contrast to the previous order, the secondary activity times are considerably reduced. On a pole, two or more shafts are molded and then hardened. Not every single drill stem needs to be inserted into the fixtures, but only one rod from which two or more drill shafts are formed. The order of manufacture should therefore be as follows:

• 1. Deforming with drawing tray and forming roller
• 2. Hardening
• 3. Disconnect
• 4. Finishing

The soft tube is brought by the deformation under strong bending stress, so that when leaving the drawing shell, however, the tension releases only in one direction and thus to an arc with the radius 12 deformed. (Gullets 5 + 9 point to the center of the arch 11 ,

One Pre-curing before curing does not apply because by a corresponding handling the deformed soft tube of hardening system supplied can be. By an appropriate leadership of the soft tube in the hardening system is the drill shaft during the hardening process prepared and hardened.

Advantages and illustration of the invention

Is the drill shaft 1 in the front, asymmetrical part 6 to a length between approx. 1 × D to 10 × D adapted to the drill head and on the remainder of the chip space length 7 symmetrically designed, creates a combined arrangement, on the one hand the advantage of undisturbed chip flow in the region of the junction 8th Drilling head met to the drill shaft and on the other hand allows buckling when drilling only in one direction. The transition from the asymmetrical part to the symmetrical part can be done either in the shaft itself ( 1 ) or be realized in an intermediate piece or in the drill head. For this purpose, the shaft consists only of a symmetrical part ( 2 ), to which an intermediate piece or the drill head is attached. In particular, the advantage of the symmetrically shaped part 7 of the drill shaft 1 to watch. The drill shaft 1 Can be pulled in a drawing tray and calibrated very accurately. It bends only in one direction to a bow when deforming and tempering. Furthermore, are secondary activities Reduced production times significantly during production. Pre-curing before hardening is eliminated. The intermediate straightening during the hardening process can be optimized so that later straightening work can be significantly reduced and the quality of the straightness improved significantly.

The Straightness and shape accuracy improves performance a single-lip drill to a decisive extent.

The drill shaft 1 can be at the symmetrical part 7 easier to measure.

1 shows a combined drill shank with asymmetrical front section 6 and a symmetrical rear section 7 ,

2 shows a symmetrical drill shank with symmetrical chip space 9 on the entire Spanraumlänge 10 ,

3 shows a cross section through the symmetrical section 7 ,

4 shows a cross section through the asymmetric section 6 ,

5 shows the arcuate state after deformation.

6 shows a semi-finished product after hardening and intermediate straightening.

7 shows a drill shank after separation

Claims (10)

drill stem 1 consists of an asymmetric front section 6 and a symmetrical rear section 7 , drill stem 101 consists only of a symmetrical section 107 Drill shank according to claim 1, characterized that he is both one-piece as well as two pieces can be produced. Drill shank according to claim 1 or 2 characterized in that that it can be provided with one or more chip spaces. Drill shank according to claim 1 or 2, characterized that it is made of different materials, preferably made of tempered steel, High-speed steel, hard metal, ceramic materials or carbon fiber composites can exist. Drill shank according to claim 1 or 2, characterized that he is executed either as a whole or as a pipe shaft can. Drill shank according to claim 1 or 2, characterized that it contains at least one cooling channel. On the order of production of single-lip balances. - deforming. - hardening. - Disconnect to individual drill shafts. The preparation according to claim 8, characterized that at least two or more Bohrschäfte arise from a soft tube rod. The preparation according to claim 8, characterized that from a Rohrkneuel at least two or more Bohrschäfte arise.

Images