DE7837135U1 - DEVICE FOR CUTTING RING LIPS IN CAPACITY BUSHINGS - Google Patents

Description

7021-40

Bremen, December 12, 197ö Sm / ka

United flight engineering Merke-Fokker Company with limited liability

Device for cutting out ring lips of mortised bearing bushes!

The invention relates to a device for cutting out bearing bushes wedged in by ring lips with a bushing that can be inserted through a bushing and an exchangeable one at one end Milling cutter and a guide dome carrying a stop bell, on whose other end, designed as a threaded shaft, one axially lockable support bell can be screwed on.

Bearing bushes of spherical plain bearings are often used in bores with the end faces provided ring lips locked. The ring lips «are grounded against with appropriate tools, e.g. presses the bevels provided at the ends of the mounting holes are printed or mortised. It is therefore necessary to the caulked To cut out annular lips of such bearing bushes when they have to be replaced. However, this is not always problem-free, especially not if bearing bushes on aircraft fittings are to be exchanged.

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So far it has therefore been customary to remove the fittings and the The mortised ring lips of the bearing bushes can be milled out in a workshop with the help of a special milling cutter. A pushing out or Pulling out the bearing bush in question was then with the help of a known pulling device possible.

Recently, however, there have been repeated requests to replace bearing bushings on built-in aircraft fittings. this requires, however, a special tool for prying out the ring lips, which can also be used in hard-to-reach places. A well-known tool that is used for milling off riveted Rfngansätze is provided by bearing bushes, consists of a guide pin that can be inserted through a bearing bushing and one that extends against the fitting applying support bell, a stop bell with a milling cutter can be screwed onto the inserted guide mandrel. This - as already mentioned - provided for the milling of riveted ring projections tool has the disadvantage that the power flow for the necessary for milling and generated by manual adjustment rotary movement takes place via pretensioned threaded nuts, which secure the removal of the milling cutter. By this measure, however, is nit a relatively strong wear of the threaded parts and thus with a Expect quite frequent replacement of these parts.

The invention is therefore based on the object, in a device of the type mentioned at the outset, the power transmission for entrainment to improve the milling cutter, in particular to exclude the thread parts necessary for setting. According to the invention we ~ d This object is achieved in that the guide mandrel at its end opposite the threaded shaft has a collar with an as Driver-trained shoulder for the attachable and axial has secured milling cutter and that the collar carries an axially secured socket with an external thread for the screwed on and thereby adjustable stop bell and with a ring recess for receiving a thrust bearing arranged at the end of the mandrel.

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This measure has no stress when cutting out a ring lip the threaded parts result from the milling cutter entrainment, so that the threaded parts only have to absorb the force for the axial positioning of the individual parts. In doing so, a milling cutter can be carried over a drive plate with on both sides in each case 90 offset cams take place, which engage in corresponding recesses in the shoulder or the milling cutter. For the A spring ring can be used to secure the exchangeable cutter axially on the guide mandrel.

It is also advantageous to have a threaded bushing guided in the bell base of the support bell for screwing onto the threaded shaft of the guide mandrel, a bearing collar provided on the threaded bushing into a recess having a needle bearing is inserted on the back of the bell bottom and axially secured. The threaded bush is provided with a nut shoulder, in order to be able to lock the support bell on the guide mandrel with the help of a lock nut.

The invention is explained in more detail using the accompanying drawing.

The drawing * shows in section a device in use for cutting out a caulked ring lip. The ring lip is here part of a bearing bush 2, which is seated in a receiving bore of a fitting 1 and is to be replaced. The device consists of a guide pin 3 inserted through the bearing bush 2, which has a collar 4 and a flange 5 at one end having. Above the collar 4 is a bushing 6 provided with an external thread, which has a widening 7 with an annular recess 8 on the side facing the end of the guide mandrel 3. In this ring recess a bearing ring 9 is used, the forms a thrust bearing together with balls 10 and flange 5. The socket 6 pushed onto the collar 4 of the guide mandrel 3 is with the aid of a spring ring 11 inserted in a groove in a known Heise secured against axial displacement.

In the shoulder 12 of the collar 4 two opposing recesses 13 are provided, in which two correspondingly positioned « Cams 15 of a driver disk 14 attached to the guide mandrel 3 engage. On its other side, the drive plate 14 has two more offset from the cams 15 by 90 Nucken 16, which in corresponding recesses 18 of one over the Engage guide mandrel 3 striped milling cutter 17. The milling cutter 17, which has a Glock.snform, is on the guide mandrel 3 with the aid a snap ring 20 is secured against axial displacements and engages with its cutting teeth 19 in an annular groove of the bearing bush 2 resulting from the annular lips. The cutting angles of the cutting teeth 19 have an angle of 45 to the outside and inwardly one of 30, each related to the longitudinal axis of the guide mandrel 3. On the external thread of the socket 6 is a The stop bell 22 is screwed on and secured in its position by a lock nut 23. This stop bell 22 has on her a plastic ring 24 against the fitting 1- resting end to avoid damage to the hardware 1.

On the other side of the fitting 1, a support bell 271 is screwed over the guide mandrel 3, which has a threaded shaft 26 at its end, with a threaded bushing 29 provided in the bell base. The support bell 27 is also provided with a plastic ring 30 at its end resting against the fitting 1 to avoid damage to the fitting 1. The threaded bushing 29 has a guide tube 32 which engages in a corresponding axial bore in the bell base 28 and is fixed therein by a spring ring 33 in a known manner. On its rear side is in the bell ■.-.- bottom 28 a recess 34 is provided in which an inserted needle bearing is held by a projection provided on the threaded bushing 29 bearing collar 36 35. A fader ring 37 secures the parts inserted into the recess 34. To adjust the device, the threaded bushing 29 is provided with a nut attachment 38, it being possible to lock the set position with the aid of a lock nut 39.

The punching out of a caulked ring lip is done in the following way Way: First the guide mandrel is inserted through the bearing bush, until the milling cutter rests against the annular lip of the bearing bush in question applies. Then-von-eng-other. Side becomes the support bell, namely

screwed onto the threaded shaft with the threaded bushing 29, until the support bell 27 with its plastic ring 30 against the fitting 1 applies. By gently tightening the threaded bushing, a corresponding advance for the cutting teeth 19 of the Milling cutter 17 set. After locking this setting with the aid of the lock nut 39, the guide mandrel 3 can e.g. With the help of one that can be attached to the screw head 40 at the flange 5 Wrench. A more cheerful advance is achieved by loosening the lock nut 39 »tightening the nut attachment 33 and Re-tightening of the lock nut 39 is set. The ring lip is milled off until the stop bell 22 moves with it their plastic ring 24 against the fitting 1 to limit the feed applies. The stop bell 22 is expediently set on the socket 6 with the aid of the lock nut 23 so that the Ring lips are almost cut off; each -calls only so far, without attack the fittings. A small amount of residual material left behind by the ring lips can occur when the bearing bushing is pushed out, easily deformed without affecting this process. The construction of the device according to the invention also allows that Replacing the milling cutter for surface grinding and / or for bearing bushes other dimensions. In this case, however, it is necessary to readjust the stop bell on the socket 6 in order not to attack the respective fitting when a ring lip is cut out. The thrust bearings reduce the friction occurring on both sides of the device, so that the force to be applied during a piercing process essentially depends on the feed rate set.

In the case of the tool according to the invention, the nut attachment and the lock nut can also be provided with appropriate levers or Have wings to make setting up or adjusting feed easy and quick.

7821-40

List of reference numbers

Bremen, December 11, 1978 Sm / ka

1 fitting

2 bearing bush

3 guide dome

4 fret

5 flange

6 socket

7 broadening

8 Ring tension

9 bearing ring

10 bullets

11 spring washer

12 shoulder 13 recess

14 drive plate

15 cams

16 cams

17 milling cutters.

18 recess

19 cutting tooth

20 snap ring

22 stop bell

23 lock nut

24 plastic ring 26 threaded shaft 2 / support bell

28 bell bottom

29 threaded bush

30 plastic ring

32 guide tube

33 spring washer

34 recess

35 needle roller bearings

36 bearing collar

37 spring washer

38 Mother approach

39 lock nut

40 screw head

Claims (6)

- PfTi sayings 1.) Device for cutting out annular lips of mortised bearing bushes with a one that can be inserted through a bearing bush and at one end a replaceable milling cutter and a guide mandrel carrying a stop bell, on its threaded shaft formed other end an axially lockable Support bell can be screwed on, characterized in that the guide mandrel (3) on its Threaded shaft (26) opposite end has a collar (4) with a shoulder (12) designed as a driver for the has slip-on and axially secured milling cutter (17) and d = iß the collar (4) an axially secured bushing (6) with an external thread for the screwed-on and thereby adjustable stop bell (22) and with a ring recess (8) for Supports a thrust bearing (5> 9 »10) arranged at the end of the mandrel. 2.) Device according to claim 1, characterized in that that the driving of the milling cutter (l7) is offset by 90 on both sides via a drive plate (14) arranged cams (15> l6) takes place in corresponding Engage recesses (13, 18) in the shoulder (12) or the milling cutter (17). 3 ·) Device according to claim 1 or 2, characterized in that the milling cutter (17) through a groove of the guide pin (3) inserted spring ring (20) is secured against axial displacement. -2- -Z- 4 ·) Device according to one of claims 1 to 3> characterized in that the cutting teeth (19) of the bell-shaped cutter (17) have a Cutting angles of 45 for the outer edge and 30 for have the inner cutting edge, each related to the axis of rotation. 5 ·) Device according to one of claims 1 to 4 »characterized in that di.2 support bell (27) an im Bell bottom (28) guided threaded bushing (29) for screwing onto the threaded shaft (26) of the guide mandrel (3) and that a 'bearing collar (36) provided on the threaded bushing (29) is in one containing a needle bearing (35) Recess (34) on the back of the bell bottom? (28) is inserted and axially secured. 6.) Device according to one of the preceding claims, characterized in that the threaded bushing (29) has a Has nut shoulder (38) and that for locking the support bell (27) a lock nut (39) which can be screwed against the nut shoulder (38) is provided on the guide mandrel (3).