DE2338866A1 - Workpiece loading and unloading device - between loading station and machining station, has gripper and operating device - Google Patents

Abstract

Workpiece loading and unloading device, especially for disc brakes, is arranged between a loading/unloading station and a machining station where the first station has a workpiece conveyor and the second station has a machine tool with workpiece chucking means. The workpiece loading/unloading device has a gripper and an operating device. A selectable gripper support device functions when the gripper is closed to transport a workpeice for the loading/unloading station to the machining station and vice versa. After workpiece release, the gripper releases a workpiece at the loading/unloading station for interchange with a following workpiece and releases a workpiece at the machining station for holding by the chucking mechanism and for machining by the machine tool.

Description

G 48 936 / N

THE MOTCH & MERRYWEATHER MACHINERY Co., 1250 East 22nd Street CLEVELAND, Ohio 44117 / USA

Workpiece loading and unloading device

The discovery concerns a workpiece loading and unloading device, that between a loading / unloading station and a processing station is arranged »with the loading / unloading station conveying means for moving workpieces to and from and wherein the processing station comprises a machine tool with clamping means for holding workpieces for processing contains.

In the production or processing of workpieces such as discs for disc brakes, it has been shown to be advantageous "hex", to convey the disks in a straight line to successive positions along a line of machine tools lie, the disks to the corresponding machine tools for performing machine processing be guided. In connection with brake disks or rotors, the line or row of machine tools can have 12 stations have, with the successive machining operations below be performed?

Station 1 ; Turning off the outer diameter of the disk; Countersinking or machining the outer brake shoe groove; partial chamfering of the inner brake shoe as an attachment point for the following machining

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beitungenj Roughening the outer diameter of the hub, the bearing bore and the Abstajidsbohrung.

Station 2s roughening the outer brake shoe, the R&D attachment side and the hub end.

Station Jt machining the outer brake shoe (ceramic) and the hub end; half-finished machining of the wheel mounting side, the bearing drills and the outer hub diameter.

Station kl turning over the part j countersinking the large inner diameter; Roughening of the inner brake shoe or the inner brake disc side and the inner hub side.

Station 5 \ Finishing the inner brake side and the inner hub side; three roundings j (all ceramic tools) t

Station 6: Finishing the large inner diameter; Rounding off the inside diameter; Roughening the bearing, sealing or End and spacing bores as well as the outer hub diameter.

Station 7s Finishing of the bevel bearing. Shoulder and hub outer diameter; half-finished machining of the bearing bore.

Station 8t Completion of re-drilling of the bearing and end bores (stepped drilling tool).

Station 9t turning the part over; Finishing of the wheel mounting side (ceramic), the wheel guide diameter (ceramic) and the bearing shoulder; half completion of the bearing bore.

Station IQt Drilling five stop holes and one work hole

Station 11; Chamfering or widening five stop holes and one bearing bore.

Station 12t turning the part over; Anchoring the side and edging the five stop holes; Turning over, washing and blowing out chips.

With the described machining sequence for turning, drilling and

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Boring brake discs are the numerous operating stages separately, so that the processing times are largely the same at each station. That is why it is with increased production essential, the transport time of the workpiece from the conveying path to the machine tool clamping and from this to the conveyor away shorten.

The object of the invention is to create an improved one Workpiece loading and unloading device, one opposite known devices allows more suitable processing.

The solution to the problem is achieved in that the Workpiece loading and unloading device has a gripper and an actuating device serving for this purpose, which optionally for detecting or releasing the workpieces at the stations works that also a switchable gripper support device in Function occurs when the Greifex fcinrichtxiiig is closed, to transfer a workpiece from the loading / unloading station to the processing station and to transport a workpiece from the processing station to the loading / unloading station, and that the gripping facility is close an influence on the workpiece release one such at the loading / unloading station for exchanging with a subsequent workpiece and one at the service station for holding by the clamping means and for processing with the Mascain tool releases.

The grippers work simultaneously to pick up an unfinished workpiece at the loading / unloading station and a finished workpiece at the processing station, with these workpieces through a 180 ° rotation of the member carrying the gripper can be displaced. At the same time, the unfinished workpiece is sent to the processing station and the finished workpiece is introduced at the loading / unloading station by opening the gripper fi ", the finished Workpiece moved from the load-unload station by a conveyor and a subsequent unfinished workpiece to the load-unload station is moved while another workpiece is being processed in the processing station.

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The device according to the invention has a simple, compact and lightweight construction to reduce inertia knobs when switching by l80 ° for conveying the finished ind unfinished workpieces. Furthermore, the grabs are operated hydraulically by double-acting fluid or hydraulic motors, dio near the center of rotation of the link that acts on the gripper tx are arranged in mutual longitudinal direction. The den The gripper elements forming the gripper are interlocked and stand in 7ali! Ie engagement with their corresponding actuation piston. Further Hcrlvinale result from the subclaims.

The invention is described below with reference to the drawings explained in more detail. Show it:

Figure 1 is a perspective view of a preferred embodiment of a workpiece loading and unloading device according to the present invention,

Figux- 2 is a partially horizontally broken plan view showing a gripper actuating mechanism and

FIG. 3 shows a vertical cross section along the line 3-3 from FIG.

The workpiece loading and unloading device 1 belongs to a series which is arranged between a workpiece conveyor 2 and a machine tool 3, which has a clamping device k and a slide carrying a cutting tool 6. In the example shown, the workpiece W is a disk or a rotor for a disk brake. As can be seen from the above description in connection with a station 12, each machine tool can be equipped with a plurality of reciprocating carriages, and in most cases the workpiece clamping devices 4 rotate with respect to the cutting tools 6, but this is for example does not apply to the stations 10 and 11 where the blunt or stop holes are drilled and ground or expanded in the disc and where the workpiece is held stationary while the borings

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rer and other drilling tools and threatened ± n relative be supplied axially to the workpiece. Along the Werkstücikförderers 2 is an unillustrated mechanism for rotating the workpiece with its hub 7 by xmten, according to the stations ¹ I to 8 and 12, are provided. In the example shown, the workpiece W can be gripped at its hub 7.

The workpiece conveyor 2 is preferably continuous working execution, and at every Lado unloading station there is a stop device 8, which is detected by the workpiece W. or is touched when this with the conveyor elements 9 is moved to align the center of the hub 7 with the centers of the loading and unloading device 1 and the machine tool clamping device 4 align.

When a workpiece W removed from the machine tool 3 appears the conveyor 2 is set, enables a lowering of the stop device 8 a movement of the workpiece W to the next load-unload station, where it is due to the movement of the associated Stop device 8 located in the path of movement of the workpiece will.

The workpiece loading and unloading device 1 is on a boom or arm 10 attached, in turn to the base of the Machine tool 3 is set. This arm 10 is vertical Guide member 11 in which the shaft 12 of the head 14 carrying the gripper is arranged so as to be vertically displaceable, for example by means of a liquid or hydraulic motor 15 at the top. The shaft 12 has gear teeth with a tooth trace on the piston rod of a horizontally arranged fluid or hydraulic motor l6, which when influenced operated in opposite directions to rotate shaft 12 by 180 ° in opposite directions to turn.

A pair of grippers 17 is attached to the head 14, wherein each pair of grippers has a pair of arms 18 and 19, which on

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the shafts of the corresponding meshing gears 20 and 21 on are wedged, the gear 2Ö with a tooth track 23 of a double-acting piston 24 meshes in a bore moved back and forth by the head fl4. When the linku piston moved upwards according to Figure 2, the gripper arms 18 and 19 are swung in opposite directions to open the gripper, to release the clamping of the hub 7 of the workpiece W. When the workpiece is ¥ finished at the workstation is, it enables the affected stop device 8, daij the finished workpiece W according to Figure 2 downwards and moved away from the lode unloading station. Thereupon the stop device 8 is again brought into the path of movement of the next workpiece W in order to grasp it between to position the arms l8 and 19 when the left piston 24 according to Figure 2 is moved downwards.

The gripper 17 on the right-hand side in FIG. 2 has the same structure as described, with the exception that the piston 24 is displaced in the opposite direction - ie upwards in order ^{to grasp the workpiece 1} W "with the gripper arms 18 and 19, and down to open the gripper 17 and release the workpiece for gripping by the clamping device 4. On the head 14 there is a distributor block 25 with two openings 26 which, according to the control with a four-way valve (not shown), alternate pressure and return openings The orifices 26 are, in use, connected to opposite ends of the cylinders in which the pistons 24 are reciprocable by means of the tubing and accessories shown in Figure 2. Each piston 24 has a nose 27 at each end which is narrow fits into a bore in the associated end cap 28 whereby, as the piston 24 approaches the end of its upward or downward stroke, the end portion of the stroke is passed through a reduced flow around the nose 27 is cushioned, at which time the shut-off valve 29 is closed. On the pressure side of the piston 24 the oil pressure wix'kt on the nose 27 and opens the shut-off valve 29 to act on the end side of the piston and a quick initial opening or closing .

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to justify movement of the gripper 17, while at the end of the gripping or loosening movements the displacements of the gripping members 18 and 19 by entry of the nose 27 into the bore of the adjacent Cylinder head 28 has been cushioned.

Each gripper arm 18 has a radially extending slideway 30 in which a jaw angel 3I is adjustably fastened, for example by means of a screw 32, the bracket being screwed into the gripper arm 18 and with its head jk engaging in a transversal groove of the jaw member 31 the Bacfceiiglied 31 is, for example, held by Eq ext ei · arm 18 by a screw 35 which loosely passes through an aperture in the arm l8 to an accurate adjustment of the back member "} allow zn! so that diu axis touching of the gripping members 36 Workpieces "an equal distance from the axis de *. Shaft 12 like the center line of the jig h aixf-

Each gripper arm 19 carries a jaw member 37 with a shaft part 38, which can be adjusted by actuating the 'Schx'aube 30 and which can be fastened in the set position, for example by means of a wedge or clamping screw 40, which has an inclined, spiral-shaped surface and a lcexl-like Flat on the shaft 38 of the Bsclveuglit-dcs 37 touched. It is essential that by rotating the arms 18 and 19 at points which are separated from one another as shown, a small difference in the diameter of the hub 7 when it is being machined in the processing station is insignificant compared to the original hub diameter, since the backdrops movement is largely straight that no noticeable rodial displacement of the Wex'kstücks W with respect to the axis of the loading and unloading device 1 is revealed. The adjustment of the jaw member 37 enables the workpiece axis to be positioned in correspondence with the axis of the clamping device 4 when the workpiece W is gripped between the cushions or parts 36 and kl wix ^ d.

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It is assumed that the left workpiece V in figures 2 and 3 not yet completed and from the stop device 8 is detected while the right workpiece has just been completed and the loading and unloading device 1 is lowered in its Position with open grippers 17 according to Figure 1 is located. During operation, hydraulic fluid is supplied here, around to the top and bottom of the corresponding left and right piston 24 act and close both Gripper 17 to justify, whereby the hub 7 of the unfinished workpiece W and the hub 7 of the finished workpiece W gripped will. At the same time, the clamping device 4 can be opened are, whereupon when the cylinder 15 is influenced Shank 12, head l4 and gripper 17 are raised to the unfinished Wei-kstück W via the conveyor guides 42 and the to lift the finished workpiece W from the clamping device 4.

After the head 14 has been raised, the cylinder 16 can be manipulated to rotate the head 14 and the shaft 12 by 180 ° the finished workpiece W in accordance with the conveyor 2 and the unfinished workpiece W in accordance with the jig 4 to position. Then the cylinder 15 is influenced to move the head 14 and the shaft 12 downwards and the finished workpiece W atxf between the conveyor its guides 42 and the unfinished workpiece W in the clamping device 4 to be arranged between their jaws. At this time the loader pressure is turned off, xrnd the clamping jaws are influenced to firmly grip the unfinished workpiece. Then liquid is fed under pressure, to act on the lower and upper ends of the respective left and right pistons 24 and the grippers 17 to open so that the machine tool slide or -gleitbügel 5 now move to the machining position and the stop device 8 can be withdrawn downwards in order to move the finished workpiece W to the next station enable. As soon as the workpiece W passes the stop device 8 has, this is influenced to the movement of the following -

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to unteinbrechen constricting unfinished workpiece \ J at the position shown on the left side of Figures 2 and 3 position.

The gripper arms 18 and 19 may be provided with rounded, spring-loaded button-head 43 engaging the flange of the workpiece W, and adjusting screws 45 spaced over the flange, thereby stopping operation if the workpiece V does not hit the ground properly the opened jig 4 is located.

Claims

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Claims (1)

Claims iierk & tücklade- and unloading device, which is arranged between a loading-unloading station and a processing station, the loading-unloading station having conveyor means for moving workpieces back and forth, and the processing station having a machine tool with clamping means for holding workpieces for the Machining, characterized in that the workpiece loading and unloading device has a gripper and an actuating device which serves to selectively grasp or release the workpieces (W) at the stations, that a switchable gripper support device also comes into operation when the Gripper device is closed, do a workpiece (W) from the loading-unloading station to the processing station and a workpiece (W) from the processing station to the loading-unloading station to transport, and that the gripper device after influencing the workpiece releases such at the Liide unloading station for replacement Seln with a subsequent workpiece and such at the operating station ztim held by the clamping means and released for processing with the machine tool. Workpiece loading and unloading device according to claim 1, characterized in that characterized in that each gripper device (17) is a A pair of gripper arms (18, 19) which approach one another around parallel axes of rotation on the gripper device and can be advanced away from each other. 3. Workpiece loading and unloading device according to claim 2, characterized characterized in that the hinged ends of the gripper arms (18,19) are engaged to control their movements synchronize. 4. workpiece loading and unloading device according to claim 3 ». through this characterized that the gripper actuator ___ ^ _ - 11 - 509807/0155 a pair of contiguous and vain hydraulic fluid has actuated piston (24) in the gripper support direction, while engaging with a gripper ex arm (18 resp. 19) of the associated pair of gripper arms (l8, 19) 5. Workpiece loading and unloading device according to claim 4, characterized in that characterized in that the pistons (24) close to one another laterally are arranged and provided with teeth that engage in tame teeth on each Greifex'arm (18 or 19), each pair of gripper arms (18, I9) meshing gear teeth has to synchronized movements of the gripper arms (18, 19) to generate according to the displacement of the piston (24). 6. workpiece loading and unloading device according to claim 4, characterized characterized in that the pistons (24) have cushioning means to brake the displacement of the gripping arms (l8, I9), when they approach a position for gripping the corresponding workpieces (W). 7 · Workpiece loading and unloading device according to claim 1, characterized characterized in that the gripper support device for switching the movement about a vertical axis between a Pair of gripper device rests. 8. workpiece loading and unloading device according to claim 7 »thereby characterized in that the vertical actuator is operationally connected to the gripper stiit zeinr ichtmig is to raise and lower these and accordingly the workpiece before switching from the Einspaimrarichtungen. to lift and lowering the workpiece after switching into the clamping means. 9. Workpiece loading and unloading device according to claim 3, characterized characterized in that a longitudinally adjustable gripper arm (l8, 19) has a jaw which grips a workpiece (W), while the other laterally adjustable gripper ex-arm (19 »18) has a jaw that grips a workpiece (W). 509807/0155