WO2003053625A1

WO2003053625A1 - Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters

Info

Publication number: WO2003053625A1
Application number: PCT/IT2002/000817
Authority: WO
Inventors: Evangelista Russo
Original assignee: Evangelista Russo
Priority date: 2001-12-20
Filing date: 2002-12-20
Publication date: 2003-07-03
Also published as: ITCZ20010016A1; AU2002366762A1

Abstract

Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger snap rings slots, the machine includes two tubular elements (22, 23) and three gear motors (12, 14 and 35); the gear motor (12) drives the boring bar rotation during metallic chips removal procedure, through the gear wheel (11) it drives the gear wheel (10) engaging the gear wheel (9) linked up to the motor hub (2) through a key (7) inserted in the groove (5) of the boring bar (4); the gear motor (14), is provided of a springs clutch (15). On the axle of the gear motor (14), that drives spindle rotation during bore welding procedure, is mounted a gear wheel (10) engaging with the gear wheel (9), this gear wheel is linked up to the motor hub (2) through a key (7) inserted in the groove (5) of the spindle (4), it drives the rack through an endless screw mechanism; the gear motor (35), for feed advance of the spindle (4), drives a rack (21) through an endless screw mechanism for locking the spindle (4) on the second tubular element (23).

Description

Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters. Technical field

This invention concerns the portable machine tools performing welding surfacing and line boring on clearance and blind holes of several diameters, drilling holes and cutting grooves or snap siger rings slots.

Summary of the invention

The portable machine tool, object of this invention, has three motors, the first one engages boring bar rotation during metal chips removal procedure, the second one engages welding torch rotation during bore welding procedure, the third one engages boring bar or welding torch for fast feed advance and for fast back return.

During bore welding procedure, the feed advance speed is mechanically controlled by welding torch rotation system, it means that there is always a steady speed ratio. The welding torch rotation motor engages the feed advance of the rack, the rack controls the feed advance through an endless screw; this endless screw engages a gear engaging the above-mentioned rack.

It is possible to use boring bars of several diameters controlled by two gear wheels with a variable number of teeth in order to obtain high or low speeds.

A modular tool holder, configured as required, can be placed over the boring bar, using two or more extension pieces, to match the diameter of the bore. The extension pieces are balanced and must be placed diametrically opposed.

State of the art

The machines tools on the market are heavy and not easily portable.

In order to overcome these difficulties, the machine tool described into the patent request WO-A-9704912 has been realised.

The machine is made according to the above mentioned patent request, it is a portable machine tool with three motors, the first motor is for the boring bar rotation, when the machine performs facing and line boring with metal chips removal, the second motor is for bore welding performances, and the third motor is for boring bar or welding torch feed advance. One can easily notice that the previous machine has several manufacture disadvantages which are the following: the boring bar or the welding torch diameter cannot be varied.

The machine is not capable of machining great holes as the boring bar is designed to line bore on small diameters; line boring holes grater than 0 200 mm cannot be machined in order to avoid vibrations.

The transmission ratio is dictated by the machine structure, therefore to change it, it was necessary re-set the machine.

During line welding procedure, an independent motor engages the feed advance, even if the operator tries to synchronise feed advance speed with welding rotation speed it is difficult to obtain a perfect feed advance/rotations ratio.

The purpose of this invention is to overcome these disadvantages and these difficulties. The main purpose of this invention is to obtain a portable machine tool capable of performing line boring, bore welding, drilling, and cutting grooves or seeger snap rings slots. This kind of machine includes two tubular elements and three gear motors. The first gear motor makes to rotate the boring bar during metal chips removal, this first motor, through a gear wheel engages a second gear wheel linked up to a third gear wheel. This third gear wheel is linked up to the motor hub through a key inserted into the boring bar groove; the second gear motor has a spring clutch. On the axle of the second gear motor, engaging the boring bar rotation, there is the second gear wheel linked up to a third gear wheel connected to the motor hub through a key inserted into the boring bar groove; the third gear motor is for fast feed advance or reversal of the boring bar, it engages the rack through an endless screw mechanism.

There is a pincer mechanism for locking the boring bar to the second tubular element, it is characterized by the motor hub and by the second tubular box where the motor hub is inserted, mounted on two rolling bearings. This pincer mechanism contains the third gear wheel linked up to the motor hub through a key; the second tubular box is fixed to the machine box and to the first tubular box, through screws; the motor hub is provided at the free extremity with a flange with holes; the gear motor and the endless screw mechanism are linked up through a transversal pivot and through a runner mounted by a trip ball mechanism; on the boring bar is mounted a tool holder ring composed by two half-rings, the first half-ring has four clearance holes and the second half ring has four threaded holes, the two half - rings are locked through four internal bolts. The above mentioned tool holder ring has two flat surfaces which are diametrically opposed as to the axis and a perpendicular port for receiving the tool holder.

Another characteristic is that the brackets supports of the repair piece are tightened to the holes of the flange by means of bolts .

Another characteristic is that oil seals are mounted on the external side of the bearings on the motor hub.

Another characteristic is that the support brackets of the repair piece are provided with holes for fixing bolts. The bolts are fixed on the repair piece by a tack of weld.

Another characteristic is that the second tubular element has pincer elements that are tightened on the boring bar through two half rings with internal screws.

Another characteristic is that the runner is driven by a trip gear having three positions.

Another characteristic is that the three positions of trip ball mechanism are the followings: - "Out position" with the transversal pivot, this pivot is set to the end of the runner, on the opposite side of a handwheel, the pivot sticks in the grooves of the gear wheel, in this position the gear wheel drives the endless screw rotation and drives the gear wheel running the rack for the feed advance.

- "Neutral position" that is intermediate position, the transversal pivot of the runner is out of the groove of the gear wheel and remains in neutral position. In this neutral position the endless screw does not turn and the feed advance through the rack can be obtained turning the handwheel manually;

- "In position" pushing the handwheel up to the extremity position, the runner goes through the trip ball mechanism and the transversal pivot gets in the groove of the third gear motor for the fast feed advance

Another characteristic is that the drive control of the third gear motor cuts out the first and the second motor.

Another characteristic is that a half ring of the tool holder ring has a male key to be inserted in the groove of the boring bar.

Another characteristic is that the tool holder ring has two flat surfaces on the opposite sides of the axis, two threaded holes and a port for the tool holder. The tool holder has a threaded part to tighten the threaded ring to set the height of the tool holder. The tool holder is locked in its port through one or more threaded grains that are screwed in their threads.

Another characteristic is that on the tool holder ring there are the extension pieces composed by two parallelepipeds with two parallel faces having the same dimension of the flat surfaces; the tool holder must be mounted on the first half ring and a key to lock by a screw is inserted on the other half ring.

Another characteristic is that the extension pieces have two threaded holes whose axis coincides with the axis of the threaded holes and one hole whose axis coincides with the axis of the port for the tool holder, the tool holder can be inserted also in this hole.

Another characteristic is that the extension pieces have two faces which are perpendicular to the faces parallel to the axis of the spindle, two threaded holes for the two screws and two threaded holes for tighten two other screws.

Another characteristic is that the flat surfaces of the tool holder ring have a cylindrical relief with the same axis of the tool holder port.

Another characteristic is that on each face of the extension piece there is a groove for the cylindrical relief of a mounted extension piece.

Other characteristics and advantages of the invention will be clear in the following description, moreover some making procedure of the invention will be given as example in the drawing 1, 2, 3, 4, 5, 6, and 7.

Short description of the figures

Figure 1 shows a transverse section of the machine object of this invention.

Figure 2 shows a section of the tool holder with a extension piece, according to the axis of the spindle of the machine object of this invention.

Figure 3 shows a section of the tool holder with a extension piece which is perpendicular to the axis of the spindle of the machine object of this invention

Figure 4 is the side-view of the tool holder with a extension piece. Drawing n°5 is a section of the tool holder with a extension piece mounted according to the axis of the boring bar of the machine object of this invention .

Figure 6 is a transverse section of the spindle and of the motor hub of the machine object of this invention

Figure 7 is a transverse section of the pincer locking the spindle of the machine object of this invention.

With reference to figure 1, it represents a portable machine tool capable of performing bore welding and line boring holes of small and great diameters.

The machines includes three gear motors 12, 14 and 35. The gear motor 12, through the gear wheel 11, drives the gear wheel 10 engaging the gear wheel 9 linked up to the motor hub 2 through a key 3.

The key 3 in the spindle 4 is provided with a groove 5.

The gear motor 14 is provided with a spring ball clutch 15. On the axle 16 of the gear motor 14 is mounted a gear wheel 10 engaging with the gear wheel 9.

The gear motor 14 is driven through the lever 8 cutting automatically out the gear motor 12. The same lever 8 engages the gear motor 14 to neutral position when the gear motor 12 is running .

On the axle 16 of the gear motor 14, on the other side of the clutch 15 and of the gear wheel 10, there is a gear wheel 17 engaging with the gear wheel 18 moving an endless screw 19 which drives a gear wheel 20 engaging with the rack 21 for the longitudinal feed advance of the boring bar 4.

The rack 21 is mounted on the first tubular element 22. In the first tubular element, on rolling bearings 6 and 7, a second tubular element 23 is mounted on the spindle 4 with pincer elements 24 locked by two half-rings 25 trough screw 26.

A first tubular box 44 contains the tubular element 22 .

In the endless screw 19 there is a runner 27 which, on one side, engages through a pin 28 with a hand wheel 29. Pulling the handwheel, the runner 27 springs, through a trip ball gear 30, in the "out position" and the transversal pivot

31, on the other side of the runner 27 (opposite to the position where the hand wheel 29 is mounted), gets in the groove 32 of the gear wheel 18, in this position the gear wheel 18 drives the endless screw 19 and the gear wheel 20 driving the rack 21 for the fast feed advance.

Pushing the hand wheel 29 the trip ball gear 30 on the intermediate position, the transversal pivot 31 of the runner 27 gets out of the groove 32 of gear wheel 18 and moves on the "neutral position". In the "neutral position", the endless screw does not turn and the fast feed advance of the spindle 4 through the rack 21 can be obtained turning manually the hand wheel 29.

Pushing the hand wheel 29 in the extreme position, the runner 27 springs through the trip ball gear 30 in the "in position" and the transversal pivot 31 gets in the groove 33 of the spindle 34 of the motor 35.

Engaging the gear motor 35 one obtains the reversal of fast feed advance of the boring bar 4.

The control dial of the gear motor 35 has a mechanism cutting automatically out the feeding of the gear motors 12 and 14 .

On the motor hub 2 there is the second tubular box 36 on the bearings 6 and 7. The bearings 6 and 7 have an oil seal 90 to lubricate the gear wheels 9, 10 and 11.

The second tubular box 36 is fixed through screws to the box of the machine 45 and to the first tubular box 44.

The replacement of the motor hub 2, of the second tubular box 36, with bearings 6 and 7, allows to use, with the same machine, gear wheels 9 with different number of teeth and spindles 4 of several diameters, giving the possibility to make stronger or lighter machines or slower and more powerful machines or faster and less powerful machines according to the necessities. The motor hub 2 is mounted on the tubular element 36. The motor hub 2 has a flange 37 provided with holes 38. The support brackets 40 of the repair piece 43 are screwed in the holes 38 through bolts 39. The support brackets 40 are provided with holes 41 for fixing bolts 42 of the repair piece 43. The bolts 42 are fixed on the repair piece 43 with a tack of weld or are screwed on the repair piece 43.

On the boring bar 4 one can mount the tool holder ring 50. With reference to figures 2-7 this tool holder ring 50 is composed by two half rings 51 and 52 . The half ring 51 has four threads 53 perpendicular to the surface of cut of the half ring 51, this half ring 51 is provided with a male key 54 engaging in the groove 5 of the spindle 4 and with four clearance holes 55 with a groove 57 for the screws 56 for locking the two half rings 51 and 52 of the tool holder ring 50 . The tool holder ring 50 has two flat surfaces 58 on the opposite sides of the axis, two threaded holes 59 and a hole 60 receiving the tool holder 61.

The tool holder 61 is provided with a threaded part for screwing the threaded ring 62 for the ₍adjustment of the tool holder 61 height. The tool holder 61 is locked in the hole 60 through one or two screws 63 to be inserted and screwed in the threaded holes 64.

On the tool holder ring 50 one can mount the extension piece 65 composed by two parallelepipeds with two parallel faces 66 and 67 with the same dimensions of the flat surfaces 58.

On the half ring 51, in the hole 60, is mounted the tool holder 61 , on the half ring 52 in the hole 60 one must insert a key 54 locked through a screw 80 in the threaded hole 81 .

The extension pieces 65 have two clearance threaded holes 68 with the axis coinciding with the axis of the threaded holes 50 and a hole 69 with the axis coinciding with the axis of the hole 60, also said hole 69 can receive the tool holder 61 that is adjusted in the same way.

The extension pieces 65 have two faces 70 and 71 perpendicular to the faces

66 and 67, two threaded holes 72 for the screws 73 and two threaded holes 74 for the screw 75.

To fix each extension piece 65 or several extension pieces 65 it is necessary, at first, to insert the reduction screw 76 in the external extension piece 65 locking the reduction screw 76 trough a screw 73 and then tighten the Allen screw 77 in the threaded holes 59 with its extension piece. To centre the extension pieces

65, the surfaces 58 of the tool holder ring 50 have a cylindrical relief 78 with the same axis of the hole 60 which can receive the tool holder 61.

On each extension piece 65, on the surface 66 there is a cylindrical groove 79 to receive the cylindrical relief 78 of a mounted extension piece.

The extension pieces of the tool holder are strong and cannot be bent in order to obtain an accurate cut. The invention, is not limited to the drawings but can be improved and modified according to the operator's necessities and without altering the patent. This invention has a great number of advantages and allows to overcome the problems which cannot be solved otherwise insurmountable with the other machines on the market.

Claims

1) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or seeger snap rings slots, the machine includes two tubular elements (22 and 23) and three gear motors (12, 14 and 35); the two tubular elements are contained in a first tubular box 44; the gear motor (12) drives the boring bar rotation during metallic chips removal procedure, through the gear wheel (11) it drives the gear wheel (10) engaging the gear wheel (9) linked up to the motor hub (2) through a key (7) inserted in the groove (5) of the boring bar (4); the gear motor (14) is provided of a spring clutch (15). On the axle of the gear motor (14), that drives spindle rotation during bore welding procedure, is mounted a gear wheel (10) engaging with the gear wheel (9), this gear wheel is linked up to the motor hub (2) through a key (7) inserted in the groove (5) of the spindle (4), it drives the rack through an endless screw mechanism; The gear motor (14) is driven through the lever (8) cutting automatically out the gear motor (12). The same lever (8) engages neutral position the gear motor (14) when the gear motor (12) is running .Moreover, there is a pincer mechanism for locking the spindle (4) on the second tubular element, characterized by the fact that the motor hub (2) and the second tubular box (36) in which the motor hub (2) is inserted, mounted on two rolling bearings (6 and 7), contains the gear wheel (9) linked up to the motor hub through a key; the second tubular box

(36) is fixed to the box of the machine (45) and to the first tubular box (44) through screws; the motor hub is provided at the free extremity with a flange

(37) with holes (38); the gear motor (35) and the endless screw mechanism are linked up through a transversal pivot (31) and through a runner (27) mounted by a trip ball mechanism (30); on the boring bar (4) it is mounted a tool holder ring (50) composed by two half-rings (51 and 52), the first half- ring has four clearance holes and the second half ring has four threaded holes, the two half - rings are locked through four internal bolts (56). The above mentioned tool holder ring (50) has two flat surfaces (58), which are diametrically opposed as to the axis, and a perpendicular port (60) for the tool holder (61). 2) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that the support brackets (40) of the repair piece (43) are screwed in the holes (38) of the flange (37) through the bolts (39).

3) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that the oil seals (90) are mounted on the external side of the bearings (6 and 7) on the motor hub (2).

4) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 2 characterized by the fact that the support brackets (40) of the repair piece (43) are provided with holes (41) for fixing bolts (42). The bolts (42) are fixed on the repair piece (43) by a tack of weld.

5) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that the second tubular element (23) has pincer elements (24) which are locked on the spindle (4) by two half rings (25) through the Allen screws (26) .

6) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that the runner (27) is driven by a trip ball mechanism (30), this mechanism has three different positions. 7) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 5 characterized by the fact that the three positions of the trip ball mechanism (30) are: "Out position" with the transversal pivot (31) set to the end of the runner (27), on the opposite side of the handwheel (29); the pivot sticks in the grooves (32) of the gear wheel (18), in this position the gear wheel (18) drives the endless screw (19) rotation and drives the gear wheel (20) running the rack (21) for the fast feed advance; "neutral position", that is intermediate position, the transversal pivot (31) of the runner (27) is out of the groove (32) of the gear wheel 18 and remains in neutral position. In this neutral position the endless screw does not turn and the fast feed advance through the rack can be obtained turning the handwheel (29) manually; "in position" pushing the handwheel (29) up to the extremity position, the runner (27) goes through the trip ball mechanism (30) and the transversal pivot (31) gets in the groove (33) of the spindle (34) of the gear motor (35).

8) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 6 characterized by the fact that control dial of the gear motor (35) cuts out automatically the gear motors (12 and 14).

9) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 5 characterized by the fact that the half ring (51) of the tool holder ring (50) has a male key (54) that is inserted in the groove (5) of the spindle (4).

10) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that the tool holder ring (50) has two flat surfaces which are diametrically opposed as to the axis, two threaded holes (59) and a hole (60) for the tool holder (61). The tool holder (61) has a threaded part for screwing the threaded ring (62) for the adjustment of the tool holder (61) height. The tool holder (61) is locked in the hole (60) through one ore two internal bolts (63) to be inserted in the threadings (64).

11)Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 1 characterized by the fact that on the tool holder ring (50) the extension pieces (65) composed by two parallelepipeds with two parallel faces (66 and 67) with the same dimensions of the flat surfaces (58) are mounted. On the half ring (51) in the hole (60) it is mounted the tool holder (61) , on the half ring (52) in the hole (60) it is inserted a key (54) locked through a screw (80) in the threaded hole (81) realized on said half ring (52).

12) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 10 characterized by the fact that the extension pieces (65) have two clearance threaded holes (68) whose axis coincides with the axis of the threaded holes (59) and a hole (69) whose axis coincides with the axis of the hole (60), also in the hole (69) the tool holder (61) can be inserted.

13) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 10 characterized by the fact that the extension pieces (65) have on the two faces (70 and 71) perpendicular to the faces (66 and 67), two threaded holes (72) for the screws (73) and two threaded holes (74) for the screw (75). 14) Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 10 characterized by the fact that the flat surfaces (58) of the tool holder ring (50) have a cylindrical relief with the same axis of the hole (60) to insert the tool holder (61).

15)Portable machine tool for carrying out welding surfacing and boring of passing and blind holes of various diameters, drilling holes and cutting grooves or snap seeger rings slots , according to the claim 10 characterized by the fact that on each surface (66) of the extension piece (65) there is a cylindrical groove (79) to insert the cylindrical relief (78) of a mounted extension piece.