FR2614226A1 - EXTERNAL REVOLUTION SURFACES AND IN PARTICULAR FOR CRANKSHAFTS. - Google Patents

Abstract

GRINDING MACHINE FOR EXTERIOR REVOLUTION SURFACES, ESPECIALLY FOR CRANKSHAFTS, COMPRISING: - A BOX 1 EQUIPPED WITH PRISMATIC GUIDES 10, 11 PARALLEL BETWEEN THEM AND TO THE LONGITUDINAL AXIS OF THE BOX, - A FIXED DRIVE HEAD 4 AND A MOVABLE COUNTER HEAD 5 , THE AXES OF WHICH ARE ALIGNED AND WHICH ARE ARRANGED AT THE OPPOSITE ENDS OF THE FRAME 1. THE GRINDING MACHINE ACCORDING TO THE INVENTION IS CHARACTERIZED AS A TROLLEY 9 TRANSVERSAL WITH RESPECT TO THE FRAME 1 AND SLIDING ON IT SUPPORTED BY ONE SIDE , A WHEEL-HOLDER HEAD 12, WITH ITS WHEEL 13 AND, ON THE OPPOSITE SIDE, A RULE 14 SUITABLE TO SUPPORT SHAFT 8 IN THE COURSE OF RECTIFICATION AND IN THAT THE WHEEL-HOLDER 12 - WITH ITS WHEEL 13 - AND THE REGLETTE 14 ARE FACING AND MOVING IN THE SAME DIRECTION, MECHANICAL MEANS OF TRANSMISSION 16, 17, 21 ARE PROVIDED FOR THEIR RELATIVE MOVEMENT OF APPROXIMATION AND REMOVAL, WHILE ALWAYS FACING THEM. APPLICATION TO THE RECTIFICATION OF EXTERIOR REVOLUTION SURFACES.

Description

The present invention relates to a rectification

  for outer surfaces of revolution, and in particular

  for crankshafts (also called crank shafts)

or "bent" trees).

  Known grinders comprise a support frame of a fixed drive head at one end and a movable counter-head at the opposite end which slides

longitudinally on the frame.

  In known embodiments, the head carries

  grinding wheel and the corresponding grinding wheel are carried by a carriage bearing on the aforesaid frame in a position which is set back with respect to a vertical plane passing through the axis of the head and of the headrest and slide

longitudinally on the frame.

  During the grinding operation of a tree,

  in particular of a crankshaft, this one is sup-

  carried at intermediate points of support between the head and the contretête with the aid of appropriate rulers (adjustable goggles), intended to provide the crank shaft with a plurality of support points so as to limit the bending due to its own weight and to absorb the efforts that the

grinding wheel exerts during the operation.

  The known grinders, however, have the disadvantage that the strips are fixed at the beginning of the operation in predetermined positions, so that when the grinding wheel operates without facing the strip, it induces on the crankshaft

  bending efforts that compromise the quality of the opera-

  tion. It is true that this disadvantage can be avoided by

  making the grinding wheel work by always

  days in front of the ruler, - which can be obtained in

  moving the ruler in front of the collar to

  tify -; however, this procedure has the disadvantage related to the high number of interventions to unlock, move, adjust and lock the strip, which

  entails an increase in the time required to

  kill the operation and thus production costs.

  The present invention therefore aims to eliminate the

aforementioned drawbacks.

  A first object of the invention is to provide a grinding machine, especially for crankshaft, in which the support strip of the collars (crank pins) of pins and connecting rods is still facing the grinding wheel

  during the grinding operation.

  Another object of the invention is to perform the adjustment of the strip in front of the collar corresponding to

  support once at the beginning of the operation.

  Yet another object of the present invention is to ensure that the ruler facing the wheel does not interfere, during its longitudinal sliding movement along the frame of the grinder, with the

  other support strips that may be present.

  These and other goals, which will emerge

  better from the description that follows, are achieved by

  a grinding machine for external surfaces of revolution, and in particular for crankshaft, comprising: - a frame, - a table resting on this frame,

  which frame and which table are equipped with guides

  parallel to each other and to the longitudinal axis of the frame (and of the table), - a fixed drive head and a movable counter-head, the axes of which are aligned and which are arranged at opposite ends of the abovementioned table, which grinding machine is characterized in that a carriage transverse to the frame supports, on one side, a grinding head with the corresponding grinding wheel and, on the other side, a support strip of the crankshaft in the zone to rectifier, and in that the grinding head, with its grinding wheel, and the ruler, are facing and are movable in the same direction, mechanical transmission means being provided to impart to them a relative movement of 'approximation and away, while still facing each other.

  According to an advantageous embodiment of the invention,

  on the table are provided several strips providing the crankshaft to rectify a plurality of fulcrums. In such a case, the transverse carriage has a concavity that surrounds the table, such that the ruler facing the grinding wheel does not interfere with a

  another slide bearing on the table when the chain

  transverse riot slides longitudinally with respect to the

frame of the grinding machine.

  In addition to the foregoing, the invention also includes other arrangements which will be apparent from

the following description.

  The invention will be better understood by means of

  additional description which follows, which refers to

attached drawings, in which:

  FIG. 1 represents a transverse view of the rectification

  FIG. 2 shows a view from above of the grinding machine illustrated in FIG. 1; FIG. 3 is a partial sectional view of the trolley, the table and the frame of the grinding machine according to FIG. FIG. 4 is a transverse view illustrating a variant embodiment,

  FIG. 5 is a side view, with section

  the grinding machine illustrated in Figure 4 and

  showing the carriage and the frame of this variant.

  It should be understood, however, that these drawings and the corresponding descriptive parts are given solely by way of illustration of the subject of the invention, of which they do not in any way constitute

a limitation.

  Referring to the figures, we can remark

  that the frame 1 supports at both ends

  brackets 2 on which a table 3 is fixed.

  On the table 3, and at the opposite ends thereof, rest the driving head 4, fixed on the table, and the counter head 5 sliding longitudinally on this table along the prismatic guides 6 and 7 (see

Figure 3).

  Between driving head 4 and against head 5 is mounted a crankshaft 8 to grind (see Figure 2), supported

at its ends.

  A transverse slide 9, sliding longitudinally

  along the axis of the grinding machine on guides

  and 11 (see FIGS. 2 and 3) provided on the frame 1,

  door, on one side, the grinding head 12 with its wheel 13, while, at the opposite end, it supports a ruler

  14 intermediate support for crankshaft 8.

  On the table 3 bears, in addition, a slider 15 sliding, too, on the guides 6 and 7, which provides another support to the crankshaft 8 in

rectification course.

  When this tree is relatively long, it is possible to use several strips 15 always bearing on

the same table 3.

  The positioning of the strip 14 relative

  to the crankshaft 8 to be rectified is carried out in turn.

  a steering wheel 16 connected to a screw 17 (see Figure 2), which

  drives the slide 14 on a slider 18 through the

  a female screw arranged inside this

  slide and not visible in the drawing.

  Next, the projections 19 and 20 of the strip 14 (see FIG. 3) are adjusted so as to make them tangent with respect to the flange collar 23 (see FIG. Similarly, using the steering wheel 21, the recessing of the grinding head 12 with sameule 13 facing the aforementioned trunnion collar 23 is carried out until

  that the grinding wheel 13 is tangent to it.

  When the grinding operation of the trunnion collar 23 is completed, it is possible to rectify the collar of

  for example, the one indicated by the reference

  In this regard, it is sufficient to align the strip 14 and the grinding wheel 13 with the flywheels 16 and 21, respectively, and to move the transverse carriage 9 along the line 14. longitudinal axis of the frame 1, using the flywheel 22 (see Figure 2), until the strip 14 and the grinding wheel 13 are exactly opposite the flange collar to be rectified which follows, for example the

collar 24.

  With the aid of the flywheel 16, the projections 19 and 20 of the slide 14 can be made to be tangent to this collar 24, and this again by positioning the index of a graduated drum 25 in front of the same measurement. than

  read when the strip 14 was in front of the collar 23.

  In the same way, we can rectify

  Trunnion collars 26, 27, 28 (see Figure 2).

  With regard, in particular, to the rectification of

  The trunnion collar 27 is already supported by the projections 31 and 32 of the wafer 15 (see FIGS. 2 and 3), which makes it possible to displace the wiper 14 (as illustrated

  in Figure 3) so as not to interfere with the operation of

  grinding procedure to be carried out, or with the strip 15.

  It is interesting to note that the configuration

  The particular embodiment of the transverse carriage 9, which comprises a recess 30 surrounding the table 3 (see FIG. 3), as well as the presence of the slider 18 for supporting the slider 14, allow the sled 9 to slide all along the frame 1 without that no interference takes place between the strip 14 supported by the frame 1 and the strip 15 supported by the

table 3.

  FIGS. 4 and 5 show an alternative embodiment of the grinding machine according to the invention, also comprising a frame 1 equipped at its ends with a stationary driving feeler 4 and a moving head against the prismatic guides 10 and 11. This variant is a solution that differs from the previous one in that the longitudinal table 3 is absent: it therefore provides, only the mounting of the strip 14 facing the grinding wheel 13, these two elements

  being mounted on the transverse carriage.

  This solution is particularly useful in all cases where the crankshafts to grind have a limited length, the strip 14 being sufficient to support the crankshaft being rectified: indeed, in this case, since the strip 14 is

  sufficient to support the crankshaft being recessed

  tification, it is possible to use a machine more

  simple and therefore having a lower cost.

  From the above description, it is therefore

  clear that the grinding machine according to the invention meets the aims mentioned above. In particular, we can notice that with this grinder it is very easy to position

  the support strip 14 in front of each rectifying collar

  proud, without performing adjustment operation, but only by bringing the ruler closer with the help of a steering wheel (or automatically by means of a hydraulic dive.

  As is apparent from the foregoing, the invention

  tion is not limited to those of its modes of

  tion and application just described in a more explicit way; it embraces, on the contrary, all the variants that may come to the mind of the technician of the material, without departing from the scope or scope of the present invention. In particular, it is clear that, well

  that the description was limited to rectification

  crankshaft shafts, the grinding machine according to the invention

  can be advantageously used also for the rec-

  any cylindrical surfaces of revolution.

Claims (5)

  1.- Grinding machine for external surfaces of revolution   particularly for crankshafts, comprising:   - a frame (1) equipped with prismatic guides (10, 11) paral-   between them and to the longitudinal axis of the frame, - a fixed drive head (4) and a movable counter-head (5),   whose axes are aligned and which are arranged at the ends   mits opposite the frame (1), which grinding machine is characterized in that a carriage (9) transverse to the frame (1) and sliding on it supports, on one side, a grinding head (12) with its wheel (13) and, on the opposite side, a slider (14) adapted to support the shaft (8) being rectified,   and in that the grinding head (12) - with its grinding wheel (13) -   and the slider (14) face each other and are movable in the same direction, mechanical transmission means (16, 17,   21) being designed to impart to them a relative movement of   close and distant, while still facing each other.   2. Grinding machine according to claim 1, characterized   characterized in that the transverse carriage (9) has a   recess (30) surrounding the table (3).   3. Grinding machine according to claim 2, characterized   characterized in that on the frame (1) is disposeda table (3) provided with suitable longitudinal prismatic guides (6, 7)   receiving at least one slider (15) sliding longitudinally dinalement on the above table.   4. Grinding machine according to claim 3,   in that the fixed head (4) and the movable counter-head (5) facing each other are arranged on the table (3). opposite ends of it.   5. Grinding machine according to any one of the   1 to 4, characterized in that the strip (14)   mounted on the transverse carriage (9) via   of a slide (18) which, while allowing the de-   placing the slide (14) in the same direction as the grinding wheel (13) (ie, parallel to the axis of the frame),   cooperates with said means (16, 21) allowing a movement   transversal approach of approximation and removal of the strip (14) relative to the longitudinal axis of the grinding machine.