Source: https://patents.google.com/patent/EP0773849B1/en
Timestamp: 2020-07-07 10:07:54
Document Index: 66904698

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 6', 'art 1', 'art 10', 'art 10', 'art 10', 'art 18', 'art 10', 'art 10', 'art 10']

EP0773849B1 - Finishing tool for precision machining of holes - Google Patents
Finishing tool for precision machining of holes Download PDF
EP0773849B1
EP0773849B1 EP19950927615 EP95927615A EP0773849B1 EP 0773849 B1 EP0773849 B1 EP 0773849B1 EP 19950927615 EP19950927615 EP 19950927615 EP 95927615 A EP95927615 A EP 95927615A EP 0773849 B1 EP0773849 B1 EP 0773849B1
EP19950927615
EP0773849A2 (en
HAM-FINAL
1994-08-01 Priority to CZ273794 priority Critical
1994-08-01 Priority to CZ377294 priority
1995-07-27 Application filed by HAM-FINAL filed Critical HAM-FINAL
1995-07-27 Priority to PCT/CZ1995/000015 priority patent/WO1996004089A2/en
1997-05-21 Publication of EP0773849A2 publication Critical patent/EP0773849A2/en
2001-11-14 Publication of EP0773849B1 publication Critical patent/EP0773849B1/en
The invention relates to a post-processing tool for the precision machining of holes that from one Clamping part, a driving head and a replaceable one Cutting part consists of at least three on its circumference distributed cutting is provided, the Cutting part is equipped with a driver pin that is inserted in a support groove in the driver head.
Post-processing tools are used in precision machining of holes mostly high requirements the total precision of execution and quality of the material, what its price and thereby the cost of this processing also increased considerably.
These costs can be limited to a considerable extent are, in particular by an embodiment in which the tool is provided with an extended shank that above all a springy introduction into the pre-drilled hole and thereby also compensation for the possible non-axis alignment of the hole and the tool.
Furthermore, tools with interchangeable Cutting parts used that wear out faster than experience other tool support parts. Interchangeability of the The cutting part is economically particularly advantageous for tools with abrasion-resistant covers, e.g. with titanium nitride, because the yield of the vacuum chambers for coating is increased many times. In the above sense is an effective solution of the interchangeable cutting parts especially current for tools for reworking Holes of smaller and medium dimensions, i.e. in the area from 5 to 25 mm.
They are also tools with an extended one Shaft and known with two to four carbide guide plates, on the circumference of the cutting part together with a interchangeable insert which are distributed by a screw is clamped in the tool head. To the Disadvantages of this solution, however, belong to the relative lower machining productivity because of only one Cutting edge and the considerable demands on accuracy the tool holder also that the exchange of the means Screw connection clamped insert relatively is difficult and especially with multi-spindle machines and machining centers undesirable downtimes of these highly productive machines.
In a known solution according to US 4 995 768 the complete tool from a holder with a driving head and from the interchangeable tool, its cylinder carrier with a driver pin on one side of the Protrudes, is equipped, the tube wall of the Driver head is provided with a support groove and side walls of this support groove with the axis of the tool one Join angles of 90 °. In the middle of the Support groove opens into a guide recess on the inner Surface of the holder is performed. To the front of the A compression spring is supported in the cylinder support part of the cavity of the holder is arranged.
Disadvantages of this solution include unsafe Fixation of the driver slot in the support groove only by the Frictional resistance during the force reaction from the compression spring, which is due to momentum forces when adjusting the rotation of the tool or during its sudden movement into the Working position for the idiosyncratic triggering and failure of the Tool can lead. It is also very unfavorable that before especially with reamer tools for smaller holes the functional and strength reasons is not possible, the driving head with a smaller outer diameter than that Diameter of holes to perform what the insertion for the creation of deep holes.
Another solution for the interchangeable tool is in US Pat. No. 2,057,143. It will again several driver pins for the attachment of one Cutting tool used in the driving head. This Construction has the same disadvantages as the previous ones Solution. There is also a risk of constipation Support groove for the driver pin from the spans and impurities and this would disrupt the safe function.
EP 0 580 486 mentions a bayonet lock for fastening of two cylinder liners. The bayonet catches of this type are for application to the interchangeable reamer tools for dimensional reasons not suitable. In addition, this bayonet lock is one Solution for a static connection, for use with it is dynamic power transmission in reamers not suitable.
Another solution based on the principle of Bayonet lock is known from US Pat. No. 1,766,136 (closest prior art). The tool carrier is provided with a driver cam, the one in a driving head, the one with an inner Form groove is provided, is first inserted and then in the groove is pressed in. The shapes of the shaped groove and the Nocks fit together. The driver cam is through a spring biased. But there is a big disadvantage in the fact that the molded groove is closed and there is again a risk of clogging of the molded groove for the driving cam of the spans and impurities and thereby the safe function would be disturbed.
From the patent US 2 337 402 is a tool for drilling consisting of a clamping part, a driving head and a cylindrical shaft for the Drill, taking the supporting shaft with a driving screw is equipped, which fits into a recess, this Recess in a longitudinally extending of the tool Groove passes, and this is a greater width than has the diameter of the driving screw and over an arc is continuously connected to the groove, whereby both the recess and the groove through the entire pipe wall of the driving head. The location of the Driver screw is by no means secured. Such Solution is only for simple operations such as Suitable for drilling.
Another known solution is the cutting part a multi-bladed reamer using a tapered shank attached by an axle screw in one tapered cavity of the tool shank is drawn. To The disadvantages of this solution include increased workload tool manufacture, in particular the aforementioned conical Surfaces and the screw connection, and also is the replacement of the cutting part, in view of the Screw connection, relatively labor intensive.
The disadvantages mentioned above are eliminated by a post-processing tool according to claim 1.
A preferred embodiment of the invention in that the resilient tongue through an intermediate wall between the support groove and the parallel vertical Groove is formed.
Working with the tool according to this invention is very effective and practical. It becomes a system of interchangeable Cutting parts used so that it is worn out the cutting is sufficient to replace only this cutting part. The replacement of the cutting part is due to the Storage of the pin in the grooves of the driving head very much quick and easy, the storage of the cutting part in the driving head is extremely reliable.
Overview of the figures in the drawings
The invention will become more apparent from the accompanying drawings explains where in Fig. 1 a tool according to the invention with a support groove and a second synchronous one Groove is shown, Fig. 2 shows a partially twisted Section through the driver head of this tool and Fig. 3 shows another embodiment of the guide recess to that Support groove.
Embodiments of the invention g
1 and 2 consists of a clamping part 1 by a cylindrical shaft 2 with a Plannut 3 for clamping the tool using a screw, not shown, in the head, not shown the machine tool is formed. The clamping part 1 can can also be designed in another version, e.g. With a tapered shaft. Steers on the clamping part 1 Shaft 4, on the purpose of a resilient introduction of the Tool a slender neck 5 formed in the pre-drilled hole is. Located in the lower part 6 of the shaft 2 the driver head 7, in which a cylindrical cavity 8 is formed. In another execution can the driver head 7 is articulated directly to the clamping part 1 be without an intermediate link of the slim neck 5, or it can be part of it. In the cylindrical Cavity 8 is a supporting shaft 9 of the cutting part 10 stored, on the circumference four blades are distributed.
As an optimal game between the cylindrical cavity 8 of the driving head 7 and the surface of the supporting shaft 9 showed a play of 5 - 12 µm.
This is because the cutting part 10 is so stored that a certain pivoting from the tool axis is possible what a positive impact on a optimal centering of the cutting part 10 compared to the predrilled Hole ensures.
On the cylindrical surface 12 of the shaft 9 can supply grooves 13 for the supply of the cooling liquid be carried out. In the support shaft 9 is a driver pin 14 pressed into two in the tube wall 16 of the driving head 7 of the shaft 4 formed support grooves 15 latches. The length of the driver pin 14 corresponds at most the diameter of the driving head 7. The upper one of the side surfaces of the support groove 15 closes with the surface lines of the cylindrical cavity 8 an angle of 90 ° and the lower side surface closes opposite the Surface lines of the cylindrical cavity 8 one in the Meaning a more acute angle that the mutual distance the side faces 17 reduced to a size, which is, for example, 0.15 mm smaller than the diameter the driver pin 14.
The radius on the end part 18 corresponds to the support groove 15 the radius of the driving pin 14. The support groove 15 passes continuously over the arch 21 into a vertical Groove 20. The lower of the side surfaces forms the upper Surface of a resilient tongue 25, which is of a relative thin partition 23 between the support groove 15 and the co-rotating groove 24 is formed, which in the vertical Nut 20 opens. This tongue 25 is resilient at the top in direction the axis of the cutting part 10 and in the direction of the driving head 7 preloaded.
In Fig. 3 is a simplified variant of the resilient tongue 25, where the support groove 15 to a gap 27 to Increase in spring force is extended.
The insertion of the replaceable cutting part 10 in the tool is inserted and twisted axially the same, the driver pin 14 in the support groove 15th latches where it is secured by the resilient tongue 22. When removing the cutting part 10 from the tool proceeded in reverse.
Finishing tool for the precision machining of holes, comprising a clamping member (1), an engagement head (7) and an interchangeable cutting member (10) having at least three cutting edges, which are distributed over its periphery and are connected to the cylindrical supporting shaft (9) thereof, the cutting member (10) being provided with a catch pin (14) on the supporting shaft (9), which pin fits in a guide recess in the engagement head, the guide recess having a groove (20) which has a greater width than the diameter of the catch pin (14) and extends longitudinally of the tool, said groove continuously communicating with a supporting groove (15) via an end member (21), characterised in that the two grooves (15, 20) extend through the entire tubular wall (16) of the engagement head (7), and in that the lower wall of the supporting groove (15) is formed by a resilient tongue (22).
Tool according to claim 1, characterised in that the resilient tongue is formed by an intermediate wall (23) between the supporting groove (15) and the identically extending groove (24).
EP19950927615 1994-08-01 1995-07-27 Finishing tool for precision machining of holes Expired - Lifetime EP0773849B1 (en)
CZ273794 1994-08-01
CZ377294 1994-08-01
PCT/CZ1995/000015 WO1996004089A2 (en) 1994-08-01 1995-07-27 Finishing tool for precision machining of holes
EP0773849A2 EP0773849A2 (en) 1997-05-21
EP0773849B1 true EP0773849B1 (en) 2001-11-14
ID=5467225
EP19950927615 Expired - Lifetime EP0773849B1 (en) 1994-08-01 1995-07-27 Finishing tool for precision machining of holes
US (1) US5868533A (en)
EP (1) EP0773849B1 (en)
JP (1) JPH10505546A (en)
KR (1) KR970704541A (en)
AT (1) AT208674T (en)
AU (1) AU3160395A (en)
DE (1) DE59509847D1 (en)
WO (1) WO1996004089A2 (en)
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1995-07-27 WO PCT/CZ1995/000015 patent/WO1996004089A2/en active IP Right Grant
1995-07-27 DE DE1995509847 patent/DE59509847D1/en not_active Expired - Fee Related
1995-07-27 JP JP50607495A patent/JPH10505546A/en active Pending
1995-07-27 AT AT95927615T patent/AT208674T/en not_active IP Right Cessation
1995-07-27 EP EP19950927615 patent/EP0773849B1/en not_active Expired - Lifetime
1995-07-27 AU AU31603/95A patent/AU3160395A/en not_active Abandoned
1995-07-27 KR KR1019970700654A patent/KR970704541A/en not_active Application Discontinuation
1995-07-27 US US08/776,999 patent/US5868533A/en not_active Expired - Fee Related
AT208674T (en) 2001-11-15
AU3160395A (en) 1996-03-04
KR970704541A (en) 1997-09-06
WO1996004089A2 (en) 1996-02-15
US5868533A (en) 1999-02-09
JPH10505546A (en) 1998-06-02
DE59509847D1 (en) 2001-12-20
EP0773849A2 (en) 1997-05-21
WO1996004089A3 (en) 1996-04-18
AU2014225861B2 (en) 2017-02-23 Drilling system for deep holes
JPH086865Y2 (en) 1996-02-28 Drill for rock drill
EP0348371B1 (en) 1993-11-18 Drill
JP5519694B2 (en) 2014-06-11 Cutting tool with self-clamping cutting head mounted releasably
CN101912986B (en) 2013-06-19 Cutting insert with helical geometry and drilling tool assembly
US7832966B2 (en) 2010-11-16 Drill for making flat bottom hole
EP0569451B1 (en) 1996-04-17 Indexable insert drill and an insert with a symmetrical drill point and cutting edges of different lengths
KR100501862B1 (en) 2005-07-20 Milling cutter
EP0859679B1 (en) 2002-04-03 Drilling tool with replaceable bit
US20170182564A1 (en) 2017-06-29 Drill head for deep hole cutting
CN1526500B (en) 2010-09-01 Drilling bit without resharpening
DE69912631T2 (en) 2004-07-29 Chisel carrier element with a flanged recession for removal
DE60204550T2 (en) 2006-03-16 Drilling cutting insert with v-shaped slot
JP3822576B2 (en) 2006-09-20 Rotary cutting tool and tool body
1998-06-03 RIN1 Information on inventor provided before grant (corrected)
Inventor name: FIALA, STANISLAV
1998-06-03 RAP1 Rights of an application transferred
Owner name: HAM-FINAL
1999-06-09 17Q First examination report despatched
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2002-03-06 GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
2002-07-27 PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]
2002-09-27 EN Fr: translation not filed