SE463703B

SE463703B - Cutting tool

Info

Publication number: SE463703B
Application number: SE8701576A
Authority: SE
Inventors: K-R Loqvist
Original assignee: Seco Tools Ab
Priority date: 1987-04-15
Filing date: 1987-04-15
Publication date: 1991-01-14
Also published as: SE8701576L; SE8701576D0

Abstract

The present invention relates to a cutting tool comprising a holder 10, a bearing plate 11, which bears against a bottom surface 18 and a lateral support 19 in a cutting position in the holder 10, the bearing plate 11 having a continuous hole 16 in which there is received a pipe screw 22 which is anchored by an external thread in a bore 21 in the holder 10, and the pipe screw anchors the bearing plate 11 in the cutting position as the result of interaction between a collar 23 of the pipe screw 22 and a step 20 in the hole 16, an indexable insert 12 being fitted on top of the bearing plate 11 and being anchored in the holder by means of a locking screw 24;24', the threaded shank 25 of which is in engagement with an internal thread of the pipe screw 22. The object of the invention is to achieve a perfectly good anchorage of the bearing plate 11 in the cutting position. The distinguishing characteristic of the invention is that the pipe screw 22 slants in towards the lateral support 19 in the direction from the indexable insert 12 towards the bearing plate 11. <IMAGE>

Description

463 703 2 uppfinningen; och fig 2 visar ett likadant snitt genom skärläget för ett skärverktyg enligt uppfinningen med en annan typ av låsskruv än enligt fig 1. 463 703 2 invention; and Fig. 2 shows a similar section through the cutting position of a cutting tool according to the invention with a different type of locking screw than according to Fig. 1.

Den i fig 1 delvis visade verktygshållaren 10 innefattar ett skärläge, i vilket är anbringade en underläggsplatta ll samt ovanpå denna ett vändskär 12 med ett genomgående hål 13, vars centrumaxel 14 förlöper vinkelrätt mot vändskärets 12 överyta 15.The tool holder 10 shown in part in Fig. 1 comprises a cutting position, in which a washer plate 11 is arranged and on top of this an indexable insert 12 with a through hole 13, the center axis 14 of which extends perpendicular to the upper surface 15 of the indexable insert 12.

I underläggsplattan 11 är upptaget ett genomgående hål 16, vars längdaxel 17 bildar en från 900 skild vinkel med skärlägets bottenyta 18, varvid längdaxeln 17 lutar in mot skärlägets sidostöd 19 i riktning ned mot bottenytan 18.A through hole 16 is accommodated in the washer plate 11, the longitudinal axis 17 of which forms an angle separated from 900 with the bottom surface 18 of the cutting position, the longitudinal axis 17 inclining towards the side support 19 of the cutting position in the direction down towards the bottom surface 18.

Hålet 16 är försett med en runtomgàende avsats 20, vilken har en radiell utsträckning i huvudsak vinkelrätt mot hålets 16 längdaxel 17. Avsatsen 20 medför att hålet 16 uppvisar ett intill vändskäret 12 beläget parti med större diameter än hålet 16 i övrigt.The hole 16 is provided with a circumferential ledge 20, which has a radial extension substantially perpendicular to the longitudinal axis 17 of the hole 16. The ledge 20 means that the hole 16 has a portion located next to the indexable insert 12 with a larger diameter than the hole 16 otherwise.

I skärlägets bottenyta 18 är upptaget ett hål 21, vilket i princip utgör en fortsättning på hålet 16, dvs längdaxeln 17 utgör centrumaxel för hålet 21. Sagda hål 21 är gängat och avsett att uppta det utvändiga, gängade partiet av en rör- skruv 22, vilken uppvisar en krage 23 som i verksamt läge anligger mot avsatsen 20. Det inses omedelbart att en åt- dragning av rörskruven 22 medför en förankring och fixering av underläggsplattan 11 mot skärlägets bottenyta 18 och sidostöd 19.A hole 21 is accommodated in the bottom surface 18 of the cutting position, which in principle constitutes a continuation of the hole 16, i.e. the longitudinal axis 17 constitutes the central axis of the hole 21. Said hole 21 is threaded and intended to receive the outer, threaded portion of a pipe screw 22. which has a collar 23 which in operative position abuts against the ledge 20. It is immediately understood that a tightening of the pipe screw 22 entails an anchoring and fixing of the washer plate 11 against the bottom surface 18 and side support 19 of the cutting position.

I det i fig 1 visade utföringsexemplet så förlöper axeln 14 vinkelrätt mot bottenytan 18 hos skärläget. Detta innebär att den vinkel a som ett plan genom avsatsen 20 bildar med bottenytan 18 är lika stor som den vinkel 8 som längdaxeln 17 bildar med centrumaxeln 14. 3 463 703 Enligt en föredragen utföringsform så kan vinkeln d göras något mindre än vinkeln 6, vilket innebär att den högra delen av avsatsen 20 i fig 1 först kommer i kontakt med rörskruvens 22 krage 23. Därmed säkerställes att en extra kraftig förankring av underläggsplattans ll, relativt skär- läget, yttre del erhålles. En lämplig differens mellan vinklarna d och Bkan vara av storleksordningen 1 - 2 O.In the exemplary embodiment shown in Fig. 1, the shaft 14 extends perpendicular to the bottom surface 18 of the cutting position. This means that the angle α formed by a plane through the ledge 20 with the bottom surface 18 is equal to the angle som formed by the longitudinal axis 17 with the center axis 14. According to a preferred embodiment, the angle d can be made slightly smaller than the angle,, which means that the right-hand part of the ledge 20 in Fig. 1 first comes into contact with the collar 23 of the pipe screw 22. This ensures that an extra strong anchoring of the outer part of the washer plate 11, relative to the cutting position, is obtained. A suitable difference between the angles d and B may be of the order of 1 - 2 0.

För att förankra vändskäret 12 i skärläget så användes i utföringsexemplet enligt fig 1 en skruv 24, vilken uppvisar ett utvändigt gängat skaft 25 som samverkar med en invändig gänga hos rörskruven 22.In order to anchor the indexable insert 12 in the cutting position, a screw 24 is used in the exemplary embodiment according to Fig. 1, which has an externally threaded shaft 25 which cooperates with an internal thread of the pipe screw 22.

Skruven 24 har en skalle 26 som är så utformad att då skruven 24 gängas in i rörskruven 22 till det i fig l visade läget så kommer först den av cirkeln 27 omgivna punkten till anliggning mot hålets 13 vägg. Därvid kommer en kraft F att påverka skäret, vilken är sammansatt av en vinkelrätt mot hàlväggen verkande normalkraft N och en i hàlets 13 axiella riktning verkande friktionskraft /u ' N.The screw 24 has a skull 26 which is designed so that when the screw 24 is threaded into the pipe screw 22 to the position shown in Fig. 1, first the point surrounded by the circle 27 comes into abutment against the wall of the hole 13. Thereby a force F will act on the insert, which is composed of a normal force N acting perpendicular to the hollow wall and a frictional force / u 'N acting in the axial direction of the hole 13.

Vid ytterligare åtdragning av skruven 24 så kommer en viss deformation av denna att ske så att anliggning även uppstår i den av cirkeln 28 omgivna punkten, varvid motsvarande krafter som i den av cirkeln 27 omgivna punkten likaså upp- träder i sistnämnda punkt.Upon further tightening of the screw 24, a certain deformation thereof will take place so that abutment also occurs in the point surrounded by the circle 28, the corresponding forces as in the point surrounded by the circle 27 also appearing in the latter point.

Det i fig 2 visade utföringsexemplet uppvisar en helt mot- svarande infästning av underläggsplattan 11 genom en rör- skruv 22. Vad gäller förankringen av vändskäret 12 så sker detta medelst en skruv 248, vilken i verksamt läge med sin skalle 268 endast anligger mot den ena sidan av väggen hos hålet 13, i fig 2 den vänstra sidan.The exemplary embodiment shown in Fig. 2 has a completely corresponding fastening of the washer plate 11 by means of a pipe screw 22. As for the anchoring of the indexable insert 12, this is done by means of a screw 248, which in operative position with its skull 268 only abuts one side of the wall of the hole 13, in Fig. 2 the left side.

Utöver dessa två ovan redovisade låsskruvar kan man natur- ligtvis tänka sig ytterligare varianter inom ramen för upp- 463 703 4 finningen.In addition to these two locking screws described above, further variants are of course conceivable within the scope of the invention.

Vad gäller underläggsplattans, och därmed även vändskärets, form i planvy så finns i princip inga begränsningar med anledning av föreliggande uppfinning.With regard to the shape of the washer plate, and thus also the indexable insert, in plan view, there are in principle no limitations due to the present invention.

Uppfinningen kan således fritt varieras inom ramen för de efterföljande patentkraven.The invention can thus be freely varied within the scope of the appended claims.

QV.)QV.)

Claims

10 15 20 25 30 35 463 703 Patent claims

A cutting tool comprising a holder (10), a washer plate (11), which abuts against a bottom surface (18) and a side support (19) in a cutting position in the holder (10), the washer plate (11) having a through hole (16), in which a pipe screw (22) is accommodated, which is anchored with an external thread in a bore (21) in the holder (10), and that the pipe screw (22) anchors the base plate (11) in the cutting position by a collar (23) of the pipe screw (22) cooperates with a ledge (20) in the hole (16), a turning insert (12) being mounted on top of the base plate (11) and anchored in the holder (10) by means of a locking screw (24; 24 '), the threaded shaft (25) of which is engaged with an internal thread of the pipe screw (22), direction from the indexable insert (12) towards the washer plate (11), characterized in that the pipe screw (22) is inclined towards the side support ( 19), the angle (ß) formed by the center axis (14) of the hole (13) with the center axis (17) of the pipe screw (22) being greater than the angle (u) given by a plane nom ledge (20) forms with the bottom surface (18).

Cutting tool according to claim 1, characterized in that the collar (23) of the pipe screw (22) has an extension substantially perpendicular to the center axis (17) of the pipe screw (22).

Base plate intended to abut against a bottom surface (18) and a side support (19) in a cutting position of a holder (10), the base plate (11) having a through hole (16), which is provided with a ledge ( 20), in that the longitudinal axis (17) of the hole (16) forms a non-right angle with the overlay and bottom surface of the underlay plate (11), a plane through the ledge (20) forming an angle (a) with the underlay plate (11 ) lower surface which is less than the angle (ß) formed by the longitudinal axis (17) of the hollow (16) with a line (14) perpendicular to the lower surface of the washer (11).