DE1967563U - GRINDING MACHINE, IN PARTICULAR FOR SURFACE GRINDING OF SPRING ENDS. - Google Patents

Description

Utility model registration St 17 696/6? A Gbm Disturbance and machine factory EiBiI Schenker A.Q., Schunenwerd (Solothurn) Switzerland

Grinding machine, in particular for surface grinding

Spring ends

The invention relates in particular to a grinding machine * for flat grinding of spring ends, with a pendulum to move the workpieces back and forth over the face of a Grinding wheel. In particular, with this machine the ends of springs, e.g. compression springs for vehicles, should be flat and be ground at right angles to the longitudinal axis so that the springs are evenly loaded.

In the previously known grinding machines of this type, the occurring when the pendulum is advanced against the grinding wheel No attention is paid to feed speeds and stresses. For example, the firmly clamped and held perpendicular to the face of the grinding disc The spring is pressed against the grinding wheel by means of a spindle at a constant feed rate. The even one "Feed has the disadvantage that it starts with that

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67a, 31/10. 1967 563. Stören- und Maschinenfabrik Emil Schenker A.G., Schönenwerd, Solothurn (Switzerland); Represent .: Dipl.-Phys. H.Schroeter, Pat.-Anw., Munich. I grinding machine, in particular for surface grinding of spring ends. 3. 9. 64. St 17 696. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2)

318.67

small grinding cross-section too slowly and at the last large end cross-section is too fast. There is therefore the risk that the end of the spring will glow at the processing point becomes and loses its shape. Furthermore, the SchleiffShig ~ ninant speed of the disc over time, whereas the feed remains the same and thus to an overload or. to a Destruction of the grinding wheel leads.

With other grinding machines, the feed movement is below the effect of a weight generated by a lever arm. Since this is the effective length of the lever arm during the Machining process changes, the feed loads are respectively The contact pressure between the ends of the peder and the grinding disc uncontrollable.

His other grinding device works with one through one Ratchet wheel controlled feed movement, which in turn inevitably results in a constant feed speed and thus an increasing feed force during the grinding process result.

When grinding one end of the spring, the machined surface from zero to the orophie of the finished end surface to. In the case of a device that operates with constant feed

67a, 31/10. 1 967 563. Stören- und Maschinenfabrik Emil Schenker A.G .. Schönenwerd, Solothurn (Switzerland); Represent .: Dipl.-Phys. H. Schroeter. Pat.-Anw., Munich. I grinding machine, in particular for surface grinding in front of spring ends. 3 9 64. St 17 696. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2)

8/31/6?

speed works, it must be selected so small that the pre-thrust forces occurring in the area of the end face do not overheat the work piece. Bs results then a feed rate, which is determined by the end surface, but which is used when machining smaller surfaces could be bigger.

Since both the area to be machined and the feed force increase at a constant feed rate, results approximates a constant contact pressure, so that it is equivalent with regard to the machining conditions whether with constant feed rate or with constant Pressure of the workpiece against the grinding wheel is worked.

The invention eliminates the disadvantages of the known arrangements eliminated. The invention consists essentially in the fact that a device for pressing the workpiece ends with constant force is provided on the grinding wheel. It then arises at the start of processing when the Cross-sections are still small, a significantly higher feed rate, which is reduced during the machining »process. Since, therefore, at the beginning of the grinding process, can be worked than before, the application of a constant feed force saves a considerable amount of time while processing.

67a, 31/10. 1967 563. Disturbing and machine factory Emil Schenker AG. Sdionenwerd, Solothurn (Switzerland); Represent .: Dipl.-Phvs. H. Sthroeter, Pat.-Anw., Munich Γ Sdileifmasdiine, in particular for flat grinding in front of spring ends. 3 9 64 St 17 696.Switzerland 4.10.63. 12 262/63. (T. 10; line 2)

318.67

In a preferred embodiment of the invention, the Andrüokvorrichtung is a piston-cylinder unit, which is a Shifts the pendulum perpendicular to its direction of movement. The way through pneumatic or hydraulic The pre-stroke produced by the means automatically adapts itself to the changing grinding cross-section and also to the decreasing one Cutting ability of the grinding wheel. This creates a achieve very precise and flawless machining of spring ends.

In the drawing, an exemplary embodiment of the invention is shown. Show it

RLg. 1 is an end view of the grinding machine, Pig. Figure 2 is a side view of Pig. I.

An axis of rotation 2 is mounted in the machine housing 1, around which the pendulum? oscillates with the work table 4 in front of the end face 5a of the grinding wheel 5. On the work table 4 3, on the other side of the central axis of the pendulum, clamping jaws 6, 7 are fixedly arranged, which are facing movable clamping jaws 8, 9 = the latter are guided by the prisms 10, H in openings 10a, 11a of the pendulum 3 and are guided by the Handwheels 12, 13 actuated spindles 14, 15 are moved against the Kleaunbacken 6, 7 or released from them. In this way, only the rough setting for clamping the workpieces takes place. In the left

67a, 31/10. 1 967 563. Stören- und Masdiinenfabrik Emil Schenker A.G., Schönenwerd, Solothum (Switzerland); Represent .: Dipl.-Phys. H. Schroeter, Pat.-Anw., Munich. I grinding machine, in particular for flat grinding of spring ends. 3 9 64. St 17 696. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2)

Festspannvorri rect are two springs 16 of small diameter and in the right plague vorrl rectification two springs 17 of larger diameter clamped centrally. As a result of the angular Forming the clamping jaws 6-9, springs of different diameters can be clamped. About feathers of an even larger diameter, the Ein ~ set pieces 18, 19 resp. 20, 21 removed.

The spindles 14, 15 are in their handwheels 12, 13 remote ends via intermediate pieces 22, 23 with piston rods 24, 25 of double-acting working cylinders 26, 27 in connection. The actual clamping of the springs 16, 17 is thereby causes the piston 24, 25 in the working cylinder 26., 27 to be drawn into it.

The lower part of the grinding wheel 5 protrudes into a vessel 28 with water 29. When it moves through in the direction of the arrow S JO, it entrains part of the water, which is used to cool the grinding points. In order to direct the coolant to the right place, channels 31, 32 are provided with baffles. The baffle 33 directs the coolant to the right processing point, while the left processing point is the cooling

\ medium via: the outlet 34 is supplied.

67a, 31/10. 1 967 563. Stören- und Maschinenfabrik Emil Schenker A.G .. Sdiönenwerd, Solothum (Switzerland); Verrr .: Dipl.-Phys. H. Schroeter. Pat. Appl. Munich. I grinding machine, in particular for surface grinding in front of spring lines. 3 9 64 st 176%. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2)

The axis of rotation 2 is guided through the housing 1 and provided with a swivel arm 35. The latter becomes a van the piston rod 36 of the working cylinder 37 pneumatically driven. By a not shown in the drawing Reversal, the compressed air is passed alternately in front of and behind the piston 36a in the working cylinder 37, whereby a movement of the pendulum 3 in a certain deflection he follows.

For the advance of the pendulum against the end face 5a of the grinding wheel 5, there is a guide in the form of a guide rod 38 provided, the arms 39 * 40 with the axis of rotation 2 is connected and takes part in the pivoting movement. Between the slide rod 38 and the axis of rotation 2 ii't a double-acting pneumatic working cylinder 41 arranged on Ptndel 3. With the piston 42, which is firmly connected to the arm 40, can the pendulum 3 displaceable on the axis of rotation 2 and the slide rod 38 both in the direction 43 of the advance as well count moving in the opposite direction. To limit the feed movement of the pendulum 3 dienei adjustable Stops 44, 45, which in the end position have a contact 46 trigger and thereby stop the movement of the pendulum.

67a, 31/10. 1967 563. Stören- und Maschinenfabrik Emil Schenker A.G .. Schonenwerd, Solothurn (Switzerland); Represent .: ! Dipl.-Phys. H. Schroeter, Pat.-Anw., Munich. I grinding machine, in particular for surface grinding in front of spring ends. 3 9 64 St 17 696.Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2)

The grinding machine works as follows : once the springs 16, VJ are clamped in by actuating the hand wheels 12, 13, the cylinders 26, 27 come into effect. The pendulum 3 is then pneumatically guided back and forth on the grinding wheel 5. The movement of the pendulum 3 guides the springs 16, 17 over the entire grinding area of the disc 5, so that the disc is worn evenly. Which is also pneumatically operating feed Practice eir yes constant contact pressure of the springs 16, 17 of the end face 5a of the disc 5 from. At the same time, intensive cooling occurs at the grinding points, since the coolant 29 is entrained by the rotation of the disk 5 and rises in the channels 31 * 32 as a result of the centrifugal effect. After the advance of the pendulum 3 has reached its end position, the pressure is maintained for a while in order to achieve an exact plane grinding.

Claims (1)

1. Grinding machine, especially for flat soles of spring ends> with a pendulum to move the workpieces back and forth over the face of a grinding wheel, g e k e η η zei chnet by a device (41, 42) for pressing the workpiece end kit of constant force against the grinding wheel (5). 2. Grinding machine according to claim 1, characterized in that g e k e η η, that the pressing device is a piston-cylinder unit (41, 42) for a displacement of the pendulum (j5) perpendicular to its direction of movement. 5. Grinding machine according to claim 2, characterized in that g e k e η η that one of the parts (piston 42) of the piston-cylinder unit (41, 42) is firmly connected to an arm (4o) which is on the axis of rotation (2) of the pendulum (3) be ^ is fixed, and that the other part (cylinder 4l) of the piston-cylinder unit is firmly connected to the pendulum which is displaceable on its axis of rotation. 67a, 31/10. 1 967 563. Stören- und Maschinenfabrik Emil Schenker A.G .. Schönenwerd, Solothum (Switzerland); Represent .: Dipl.-Phys. H. Schroeter, Pat.-Anw., Munich. I grinding machine, in particular for surface grinding in front of spring ends. 3 9 64. St 17 696. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2) 3t 8.67 Schielfmanahine esp. according to one of claims 1 to 3, characterized gokennzei without knowing that a »pendulum (3) a device for clamping the workpieces (16, 17), In particular for plague tensioning the spring ends., At least on the circumference of its last bend adjacent to the grinding wheel (5) is provided. 5. Grinding machine according to claim 4, characterized in that g e k e η η, that on the pendulum (3) two Festspannvorrid-'tungen with fixed jaws (6, 7) and movable ones Bake clay (8, 9) are provided. 6. ScMeifmaschliie according to claim 5, characterized in that g e k e η η zsi chnefc that to pretension the movable Klemtnb.oken (8, 9) screws / spindles operated by handwheels (12, IJ) (14, 15) and piston-cylinder units (24, 26; 25, 27) are provided for plague tensioning. 7. Grinding machine in particular. According to one of claims 1 to 6, characterized characterized in that for driving the pendulum (?) a piston-cylinder unit (36, 37) with double-acting piston (36) is provided. 67a, 31/10. 1967563. Stören- und Maschinenfabrik Emil Sdienker A.G., Sthönenwerd, Solothurn (Switzerland): Sales: Dipl.-Phys. H. Schroeter, Pat.-Anw., Munich. I grinding machine, in particular for flat grinding of feather joys. 3. 9. 64. St 17696. Switzerland 4. 10. 63. 12 262/63. (T. 10; line 2) 318.67 ■ r - 10 - 8. Grinding machine according to one of claims 1 to 7, characterized in that the grinding wheel (5) is partially immersed in a coolant (29). 9. Grinding machine according to claim 8, characterized in that channels (31, 32) are provided for guiding the cooling liquid (29) to the grinding points.