DE102005009177A1 - Multifunctional clamping tower e.g. for metal pieces, has rectangular or square form for predominantly horizontal machine tools with each tower having housing wall with four to sixteen exchangeable module clamping units bolted - Google Patents

Abstract

The tower has a rectangular or square form for predominantly horizontal machine tools. Each tower has a housing wall with four to sixteen exchangeable module clamping units (72 - 74) bolted. Three different clamping unit building groups are provided, having a round and angular workpiece form and fastened with parts formed by externally screwed on tension adjusters, on an expander.

Description

Introduction; Field of use, current state

Clamp towers will be i.allg. in the mechanical, machining production of metal parts on processing machines, used. Especially when editing of high volumes on a machining center or milling machines become predominantly tombstones used. At turrets can therefore several workpieces be spanned and processed at the same time. For even higher quantities can two towers mutually over Pallet changer, one in processing and the other outside the machine for the equipment, be used. (In the following tensioning tower ST) The workpieces are so far mainly Manually inserted in the ST and tightened. So that the work spindle the machine can also approach every workpiece on the 4 side surfaces, the entire tension tower must be able to turn. Therefore, the tension tower be placed on a machine-side NC rotary indexing table.

• – Hohenstein
• – Schunk, Lang
• – Römheld, Röhm
• – Arboga Iron
• – Albeck

State of the art; Current clamping systems currently on the market Internet / Patent Search ( DE 100 03 449 C2 B23Q3 / 02) Here are some companies that offer simple clamping towers in the field of clamping technology:

• - Hohenstein
• - Schunk, Lang
• - Roemheld, Rohm
• - Arboga Iron
• - Albeck

disadvantage of the current state of the art

The Today's on the market scarf towers are very simple. tombstones exist i.d.R. from a rectangular high, hollow metal case 1 to approx. 3 individual workpiece clamps on each of the 4 outer sides are screwed on. On these clamps workpieces are on the circumference manually tightened.

The workpieces have to manually with the help of a key on the workpiece clamps be used and screwed.

The clamped workpieces can i.d.R. not or not automatically for another side processing will be rotated unless by Solve several Screw, twist the tensioner and tighten again. Moreover can only square or rectangular parts are clamped. Round parts can although over untwisted clamping jaws clamped, but not concentric over high numbers be used.

Thereby that you span many and similar workpieces and edit may be the current towers Although inexpensive with their simple, screwed tensioners, but have the serious disadvantage that they are not workpiece or job-flexible can be used. Also missing today is the automatic tensioning, loosening and rotate the parts.

The today's towers are currently at high volumes same workpiece parts used, with the disadvantage of strenuous muscle work by manual tighten.

Advantages of New invention

at In the present patent application, a tension tower is described, on mechanical working machines (especially on horiz. milling machines, Boring mills etc.), used in the machining production for clamping of workpieces becomes.

The Novelty lies in the modular structure (interchangeable Clamping units) of the tension tower. Furthermore, in the different workpiece geometry recording forms the module clamping units. Desw. in different, automatic rotatable drives of the clamping units (allows 5-sided machining) and the automated voltage. The internal mechanics required a big casing this is the further advantage of very high dimensional stability brings. The three different modular clamping units can each arbitrarily in the tension tower housing openings be used and screwed. This allows an extremely flexible production. For each clamping unit is the clamping force and the clamping stroke adjustable.

Also different sizes workpieces can by exchanging on the market available collets and / or Clamping jaws are clamped. Clamping and loosening and turning of the clamping units with the workpieces, can be automated in fixed angular steps via cup spring packs, hydraulic u. pneumatic pressure to be performed. This is a five-page editing of workpieces possible.

1

72

shows the complete round clamping unit

73

shows the complete square clamping unit

74

shows the adapter plate for Externally purchasable screw-tighteners

75

shows the C-axis rotation of the clamping units

76 + 77

demonstrate Two externally purchased clamping devices on the adapter plate

fixed can be

By The automatic activation of all movement units can be done by loading, unloading, Air blowing and turning over a robot or handling device be completely automated.

Variants:

• – Vollkommen automatisiert
• – über Bussystem, Ventile innenliegend
• – Manuell betätigte Schaltventile zum Spannen-Lösen

Clamping tower 4 to 12-speed rotating clamping units (non-rotatable) Actuation of the movements can be realized as follows:

• - Fully automated
• - via bus system, internal valves
• - Manually operated switching valves for tension release

2 shows a longitudinal section through the entire tension tower incl. All internal parts. In this longitudinal section three different clamping units are used.

3 shows a cross section through the entire tension tower with two inserted round clamping units 72 and two adapter units used 74 ,

4 shows a cross section through the entire tension tower with two inserted round clamping units 72 and two inserted angular clamping units 73 ,

The tension tower consists of a housing 1 made of gray cast iron or steel. The housing 1 may also consist of Guß.- or of individual composite side plates. The housing 1 has a square base with the dimensions 365 × 365 min and serves to accommodate about 4 to 16 rotatable, assembled into modules clamping units 72 . 73 . 74 , The housing is hollow inside and has a wall thickness of about 10 to 14 mm. Basic and Cover surface can be cast or screwed. The housing has on each side two or three large openings (mounting holes) in these the clamping units 72 . 73 . 74 plugged in and screwed.

In order to stabilize the large mounting holes on the housing, are on the inner u. Outside, material thickening as so-called. Reinforcement rings available. The base of the housing is open, here is a lid un 2 screwed, above is for assembly u. Feed cable / hoses another large opening or a lid ob 3 , With a suitable NC turntable version, the entire power supply (hoses, cables) can also be carried out by this at the bottom of the tower.

Inside in the center of the tension tower housing is a rectangular central tube 4 , the bottom and top of the lid u. Bottom of the housing is attached. Among other things, the compressed air line and the hydraulic lines run along in it. The central tube 4 also serves to attach the holder 5 for the rotary sensors 6 and for receiving the rotary divider 8th , (Rotary divider seated in the quadr. The rotary dividers have a milled recess of 45 degrees on two sides. The air passes over the rotary divider 8th for rotary feedthrough 7 then to the center hole of the chuck shafts 23 . 37 and finally blown out at the front end of the shaft to clean the parts. The hydraulic pressure / fluid is via flexible hoses or channels from the housing cover to the individual rotary unions 7 guided and bolted there 13 , Inside the housing are the stepper motors 9 screwed on for the clamping unit rotation. At the other end of the engine sits the drive gear 10 for moving the clamping units 72 . 73 . 74 ,

These clamping units are round as collets for the workpiece receiving molds 29 , for angular parts as clamping jaws or designed for external clamping means as a so-called adapter plate. The three different clamping units 72 . 73 . 74 are interchangeable with each other in the housing.

to Further recording of different workpiece sizes, the jaws and the Collets interchangeable in their clamping units.

All three rotating clamping units 72 . 73 . 74 are about two big radial bearings 26 - or plain bearings 26 and over thrust bearings 27 stored. The rotational movement of the clamping units take over one or more stepper motors 9 , This rotary engine can also be a hydr. or pneumatic drive.

The stepper motors 9 drive via a straight or helical gear teeth or drive gear 10 the clamping units 72 . 73 . 74 at. The clamping force during workpiece machining produce a cup spring package 38 . 51 , The workpiece tension is released hydraulically via the applied pressure of approx. 120 bar. Each SE is over a face gear set 14 . 15 . 16 (Hirth gearing) located at the front of the housing 1 supported, held in 3, 4, or 5-degree increments and thereby blocked.

For any integer angle intermediate degrees such as 2.0 / 2.5 / 3.0 degrees and multiples thereof, the serration is unscrewed and a suitable plan spline set 14 . 15 . 16 replaced and screwed on.

The movement, and thus the axial tensile force of the face gear ring on the other Planverzahnungsringe, for blocking, are of several pneumatic or hydr.-locking cylinders 17 or a diaphragm ring cylinder, applied.

The rotational movement of the B-axis (of the complete tensioning tower) must be on the machine side, by the customer. The introduction of compressed air u. Hydraulic lines, sensors 6 and E-motor cable in the rotation of the B-axis, happening at the top of the lid via a novel flexible feeding system, or through the bottom of the housing.

This supply system leaves that entire tension tower to a rotational movement of ± 180 ° to (as in robots). The entire cable u. hoses can also over the bottom is discharged to the outside become.

The laying of the hydraulic hoses, the compressed air supply and the electr. Cable for stepper motor 9 and sensor cable 6 are in the compl. Construction not excellent.

Curious; excited become the workpieces ultimately over a plate spring package.

Each individual clamping unit can be controlled individually with hydraulic pressure to release the workpieces. From the outside via a movable feeding system, up to 12/16 small hydraulic lines are brought to the clamping tower and screwed to the housing cover plate. But it can also be a hydr. Supply line and a return line be present. The control takes place via manually operated valves on the housing or else via bus-controlled valves in the interior of the tension tower. The rotary feedthrough 7 itself is not rotatable, it is by a pin 78 held. In the rotary union 7 is a ring oil groove 58 in the wave 23 . 37 a hole over which the hydraulic fluid from there finally into the pressure space between the shaft piston and cylinder 22 . 36 arrives. For ventilation 57 has the shaft piston at the top of a small hole in a hydr. Valve is seated. The valve opens only at slightly higher pressure than the normal working pressure. The seated opposite the valve gear 20 has a hole exactly at the height of the valve at the circumference. For venting a hose is pushed through the gear hole on the valve in the shaft piston and vented by increased pressure surges. For lubrication 69 are mounted on the outer housing several grease nipples. Inside the housing, they guide the grease through hoses and bores into the spaces of diaphragm spring, bearing points and pressure sleeve 28 ,

01

casing

02

cover U.N

03

cover if

04

central tube

05

holder

06

rotation sensors

07

Rotary union

08

rotary dividers

09

stepper motor

10

drive gear

11

Cover plate

12

air pipe

13

hydraulic connection

14

Face gear ring firmly

15

Face gear ring twist

16

Face gear ring axial

17

lock cylinders

18

drawbars

19

Einschraubgehäuse_rd

20

gear

21

locknut

22

Zylinder_rd

23

Welle_rd

24

Tellerfederpaket_rd

25

lock washer

26

radial bearings

27

thrust

28

pressure sleeve

29

collet

30

Collet nut

31

Screw

32

O Ring01

33

O Ring02

34

O Ring03

35

Einschraubgehäuse_ek

36

Zylinder_ek

37

Welle_ek

38

Tellerfederpaket_ek

39

Back recording

40

Emotional jaw carrier

41

Fester jaw carrier

42

pull lever

43

Toggle axis

44

Druckhebel_kurz

45

Druckhebel_lang

46

Kolben_Verdrehsicherungsstift

47

piston

48

fixing screw

49

Hub adjustment

50

axle

51

Tellerfederpaket_ek

52

Rifle

53

Überhub_Einstellschraube

54

adapter cylinder

55

Screw

56

fixing screw

57

vent

58

Ringölnut

59

support part

60

knee

61

Zugachsbolzen

62

guide piece

63

slide

64

Fester_Achsbolzen

65

Beweg_Achsbolzen

66

stop piece

67

Überhub_Tellerfeder

68

locking screw

69

lubrication hole

70

Verdrehsicherungbohrung

71

O-ring

72

Runde_Spanneinheit complete

73

Eckige_Spanneinheit complete

74

adapter unit complete

75

used rotatable clamping unit

76

external, buyable 3-jaw food

77

external purchasable clamping block

78

Rotary union-locking pin

79

hydraulic drilling

80

pneumatic drilling

81

centering

5 Clamping unit round with collets

The complete assemblies clamping unit 72 round outwards there is the fixed in the tower housing 1 screw-fastened housing approx 19 , In this screw-in housing 19 sits inside the cylinder rd 22 , The cylinder 22 is with the screw-in housing 19 rotatably connected by four bearings.

Through two radial bearings 26 and two thrust bearings 27 ,

The axial clearance is determined by the tightening torque of the lock nut 21 set.

At one end of the cylinder 22 , after the grooved nut 21 , is the gear 20 for the initiation of the rotary movement, screwed on. Through the center hole of the gear 20 , the end of the shaft protrudes rd 23 out. On this wave 23 sits the rotary union 7 , The rotary feedthrough 7 is in the axial direction by two on the shaft 23 sitting circlips, held. Against the rotation direction of the shaft 23 owns the rotary feedthrough 7 an anti-rotation hole 70 with a performing security pin 78 , The pencil 78 is in the central tube 4 welded and thus holds the rotary feedthrough 7 stationary. The rotary feedthrough 7 has a hydraulic thread connection 13 , In the interior, the threaded hole leads to an annular diameter in the inner diameter 58 ,

In the rear end of the cylinder 22 is the hydraulic venting 57 brought in. At the other outer end of the cylinder 22 outside the circumference, sits the face gear set. The face gear set consists of three face gears. The solid planetary gear ring 14 sits on the case 1 , centered to the housing bores and is through a groove in the housing 1 centered, as well as held by screws and pin there in the housing. The one with the cylinder 22 revolving planetary gear ring 15 sits pinned and screwed on the circumference of the cylinder 22 , Both planetary gear rings 14 + 15 aligned in the radial direction. The wide axial planing ring 16 is through tie rods 18 with high force at the same time covering on both planetary gear rings 14 + 15 pressed.

The pulling force is through inside the housing 1 lying one or more pneumatically or hydraulically acting locking cylinder 17 applied. Through this mode of action of the pressing and lifting axial Planverzahnungsringes 16 the blocking of the entire clamping unit is realized.

The clamping force is a Tellerfederpaket_rd 24 generated. The clamping force of the disc springs pushes over a stroke of about 3mm on the pressure sleeve 28 , The pressure sleeve has a beveled cone of approx. 15 degrees on the inside. The pressure sleeve 28 presses on the collet lying in it 29 , The collet is moved forward through the collet nut 30 held axially. Due to the cup spring force over the cone, the slotted collet presses together. Pickled workpieces in the collet are clamped radially. The pressure sleeve 28 gets on the shaft 23 screwed on and through precisely tuned force and way is the bias of the disc springs 24 reached. The wave 23 has at this end a milled square, on this is the lock washer 25 attached and in the pressure sleeve 28 screwed. This results in a continuous force connection, of shaft 23 , Lock washer 25 and pressure sleeve 28 , The on the shaft 23 turned piston has a small bore by a Kolben_Verdrehsicherungsstift 46 with some play running axially, but the other half stuck in the cylinder 22 . 3G is pressed. The rotation of the cylinder 22 with all the parts attached to it, done via the previously mentioned stepper motor 9 , Drive gear 10 , Gear 20 , Fixing screws 79 , on the cylinder 22 , Stored is the cylinder 22 with two radial 26 and two thrust bearings each 27 in the screw-in housing_rd 19 Outside of the cylinder circumference sits the carrier part 59 and on it the co-rotating Planverzahnungsring 15 ,

6 u. 7 Clamping unit angular with clamping jaws

The complete assemblies clamping unit 73 round outwards there is the fixed in the tower housing 1 screwed-in screw-in housing ek 35 ,

In this screw-in housing 35 sits inside the cylinder ek 36 , The cylinder 36 is with the screw-in housing 35 rotatably connected by four bearings.

Through two radial bearings 26 and two thrust bearings 27 ,

The axial clearance is determined by the tightening torque of the lock nut 21 set.

At one end of the cylinder 36 , after the grooved nut 21 , is the gear 20 for the initiation of the rotary movement, screwed on. Through the center hole of the gear 20 , the end of the wave ek protrudes 37 out. On this wave 37 sits the rotary union 7 , The rotary feedthrough 7 is in the axial direction by two on the shaft 37 sitting circlips, held. Against the direction of rotation of the shaft 37 owns the rotary feedthrough 7 an anti-rotation hole 70 with an accomplishing pen 78 , The pencil 78 is in the central tube 4 welded and thus holds the rotary feedthrough 7 stationary. The rotary feedthrough 7 has a hydraulic thread connection 13 , In the interior, the threaded hole leads to an annular diameter in the inner diameter 58 ,

In the rear end of the cylinder 36 is the hydraulic venting 57 brought in. At the other outer end of the cylinder 36 outside the circumference, sits the face gear set. The face gear set consists of three face gears. The solid planetary gear ring 14 sits on the case 1 , centered to the housing bores and is through a groove in the housing 1 centered, as well as held by screws and pin there in the housing. The one with the cylinder 36 revolving planetary gear ring 15 sits pinned and screwed on the circumference of the cylinder 36 , Both planetary gear rings 14 + 15 aligned in the radial direction. The wide axial face gear ring 16 is through tie rods 18 with high force at the same time covering on both planetary gear rings 14 + 15 pressed.

The pulling force is through inside the housing 1 lying one or more pneumatically or hydraulically acting locking cylinder 17 applied.

Through this mode of action of the pressing and lifting axial Planverzahnungsringes 16 the blocking of the entire clamping unit is realized.

The clamping force is a Tellerfederpaket_ek 38 generated. The clamping force of the disc springs presses over a stroke of about 5 to 9 mm on the piston 47 , The piston 47 is on the Welle_ek 37 screwed. About the screw thread, the bias of the disc springs 38 be set. Secured against twisting is the piston 47 with a lock washer 25 the on the square of the shaft 37 sitting and in the butt 47 is screwed. At the front end of the shaft 37 is a hole for a toggle lever axis 43 brought in. At the toggle lever axis 43 rotatably mounted is a toggle joint 60 , At the other end of the toggle joint is also a bore with an axle bolt 50 appropriate. At this axle 50 are two pressure levers_kurz 44 and pressure lever_lang 45 rotatably mounted. The pressure lever is long 45 has a hole in the one end at the other end 64 sitting tight with the jaw pick 39 (Carrier part) is connected. As a result, the pressure lever is long 45 at this end firmly with the jaw holder 39 fixed but rotatably connected. The other pressure lever_kurz 44 has a movable axle at the outer end 65 and this axle bolt 65 further connected to the bore of the slider 63 , Now do this knee joint 60 , last by the cup springs 38 a stroke, in the vicinity of the dead center, so that is one end of Druckhebel_lang 45 with the fixed axle bolts 64 held and the other Druckhebel_kurz 44 can with the slider 63 make a small lifting movement. Now continue to sit on the moving axle 65 left and right outside two more very long pull lever 42 the lifting movement of the slider 63 with execute. This pull lever 42 lies diagonally high to the other end of the socket 52 , The socket 52 sits in the moving jaw carrier 40 , pull lever 42 and socket 52 are connected by bolts and holes. This makes the jack 52 also the lifting movement with. Continue to sit in the movable jaw carrier 40 also an over-stroke plate spring package_ek 67 , The stroke of the socket 52 will be on the plate spring pact 67 transferred, this in turn presses on the movable jaw carrier 40 , The movable jaw carrier 40 moves with the lifting movement against the fes th jaw carrier 41 , whereby workpieces can be clamped. The underside of the movable jaw carrier 40 is open, so the socket is needed 52 and the plate spring package 67 the leadership of a Zugachsbolzens 61 ,

The stroke values can be in the area around the dead center position of the knee joint 60 with the over-stroke adjustment screw 53 , be adjusted by the stop on the screw. Desw. can the movable jaw stroke and thus the clamping force, in small limits by the stop of the stroke adjusting screw 49 be set. The solid jaw carrier 41 is with the jaw pickup 39 firmly screwed and pinned. Mobile jaw carrier 40 and solid jaw carrier 41 run in guide grooves of the jaw holder 39 ,

The rotation of the cylinder_ek 36 with all the parts attached to it, done via the previously mentioned stepper motor 9 , Drive gear 10 , Gear 20 , Fixing screws 79 , on the cylinder 36 , Stored is the cylinder 22 with two radial 26 and two thrust bearings each 27 in the screw-in housing_rd 19 , Outside of the cylinder circumference sits the carrier part 59 and on it the co-rotating Planverzahnungsring 15 ,

8th Clamping unit with adapter plate

In this assembly, the same parts are mounted as on the other three clamping units; the rotary feedthrough 7 , Drive gear 10 , Storage 26 . 27 and planer teeth 14 . 15 . 16 , The clamping unit with adapter plate complete 74 serves as a carrier, or offers for the standardized clamping means of other manufacturers, for example, the possibility of this clamping means on the adapter plate 54 to attach or screw on and also to drive. But it can also be fixed parts there on the adapter plate directly. The mounting holes, pins and threads on the outside or end face on the adapter plate are mounted so that they have a standardized hole pattern so that purchasable external clamping holder can be attached there.

On the surface of the adapter plate 54 , at the end of the hydraulic bores 79 and pneumatic bores 80 are locking screws 55 appropriate. Through the inner holes 79 . 80 Optionally, external clamping systems such as external chucks are used 76 or external clamping block 77 screwed.

In the middle of the adapter plate 54 There is a precisely worked, lowered cut-out for centering 81 the external clamping device, this may be convex or concave (here).

The rotation adapter plate 54 with all the parts attached to it, done via the previously mentioned stepper motor 9 , Drive gear 10 , Gear 20 , Fixing screws 56 , Mounted is adapter plate 54 with two radial 26 and two thrust bearings each 27 in the screw-in housing_rd 19 , Outside of the adapter plate circumference sits the carrier part 59 and on it the complete spline set 14 . 15 . 16 ,

Claims (8)

Tension tower with rectangular or square shape for predominantly horizontal machine tools, characterized in that in each tension tower housing wall at least 4 to 16 inserted and replaceable module clamping units ( 72 ) 73 ) 74 ) are bolted. Clamping system for machine tools, characterized in that three different clamping unit assemblies, clamped for round and square workpiece receiving molds, as well as arbitrarily shaped parts by externally screwed clamps on the adapter plate ( 54 ), can be attached. Clamping system for machine tools, characterized in that the clamping of different workpiece sizes by replacing collets ( 29 ) and jaws on the guide piece ( 62 ) in the clamping unit assemblies is possible. Clamping system for Machine tools characterized in that all three Spanneinheiten- Assemblies in the housing with the workpieces through a controller by means of step.- or servomotors, are rotated can (5-page editing by C-axis rotation). For a derived variant, the rotation also be done manually. In a further variant, the clamping unit rotation can be omitted in principle. Clamping system for Machine tools characterized in that the blocking of the clamping unit rotation over a outside Planverzahnungssatz (Hirth toothing) is executed. The third axial face gear is hydraulically or hydraulically overlying the housing pneumatic round or membrane cylinders and tie rods on the pulled two other Planverzahnungsräder or pressed Clamping system for Machine tools characterized in that the voltage of workpieces in the respective clamping unit assembly via cup spring packages and / or Tighten the toggle. Solved becomes hydraulic or pneumatic. Clamping system for machine tools there characterized in that in the round clamping unit ( 72 ) and the angular clamping unit ( 73 ) the clamping or clamping force and the way can be adjusted. Clamping system for Machine tools characterized in that all three clamping unit assemblies the same, exchangeable housing receptacle Offer.