JPH03142172A - Device for clamping center of work for machine vice - Google Patents

Abstract

PURPOSE: To clamp different workpieces with the same mechanical vise by providing a device for adjusting a center plane against the base plate of the mechanical vise. CONSTITUTION: The whole drive spindle 7 is moved in the axial direction of the drive spindle 7 together with carriages 2, 3 having boosters 13, 14 and clamping jaws 4, 5. A center plane 39 for a vise main body 1, i.e., for a base plate 46, can be adjusted. The base plate 46 is formed integrally with the vise main body 1.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a vise body and a vise body in which two carriages, each movable symmetrically with respect to the central plane of the vise and each having one clamping jaw, are disposed. , and a drive spindle for both said carriages.
This invention relates to a workpiece center tightening device for a mechanical vise.

BACKGROUND OF THE INVENTION A mechanical vise is disclosed in German Patent Application No. 12 20 800, which makes it possible to clamp the center of a workpiece. The mechanical vise also has a booster which, during the clamping operation of the vise, applies significantly more force to one clamping jaw than would be possible simply by using the drive spindle. to the other clamping jaw. The crank-input feed movement is significantly slowed down by the booster and the force is increased accordingly. In this case, the prior art uses a hydraulic booster.

Although known mechanical vises in conjunction with a booster make it possible to mount the workpiece accurately even with relatively high clamping forces, the clamping operation is based on the elastic deformation of the workpiece as well as of the mechanical vise. Sometimes, it is impossible to eliminate changes in the tightening center, that is, changes in the center plane between the tightening jaws. This is particularly disadvantageous when several machine vises are used on the same machine tool or when different workpieces need to be clamped.

[Problem to be Solved by the Invention] An object of the present invention is to improve the known workpiece center clamping device so that the workpiece can be mounted with high precision even when the clamping force is as high as can be obtained by a booster. The goal is to make it easy to use.

[Means for Solving the Problems] Constituent means of the present invention for solving the above-mentioned problems are such that, in the workpiece center tightening device of the type mentioned at the beginning, a device for adjusting the center plane with respect to the base plate of the mechanical vise is provided. It is at the point where it is set up.

1 Effect 1 The adjustment device, which can be configured in various ways, makes it possible, for example, to compensate for unavoidable deformations of the workpiece and to fix the workpiece in a precisely defined position.

[Advantageous configuration] The device according to the invention is configured, for example, in such a way that the vise body can be adjusted in its entirety relative to a base plate that is configured separately from the vise body. . In that case, the vise body is mounted in carriage form on a base plate with suitable adjusting spindles or similar means.

In a further development of the invention, the vise body is provided with an axially adjustable counter for the drive spindle or for the associated booster. In this case, the base plate can be constructed integrally with the vise body.

In this case, a plate is disposed at each end of the vise body, and each plate has a female threaded hole into which a screw or a threaded bushing is adjustably screwed, and the plate has a female threaded hole into which a screw or threaded bushing is adjustably screwed. It is advantageous for the drive spindle or the booster to be supported during center tightening in order to obtain a clamping jaw movement for tightening by the booster independently of the rotational movement of the drive spindle. A two-part construction is known. In such a structure, the invention provides that the two spindle parts of the drive spindle are not rotatable relative to each other in the working position, but are coupled axially movably via a coupling element, which coupling element is separable. and can be rotated relative to each other for adjustment and fixed again. In this construction, adjustment is essentially effected by relative rotation of the two spindle parts of the drive spindle. In this way it is possible to maintain the motion of one carriage and the immobility of the other carriage. This is nothing but adjusting the center plane between both carriages.

In a further development of the invention, at least one carriage has a spindle nut configured as a bushing with an external thread and an internal thread, the internal thread cooperating with the drive spindle or the associated spindle part. Further, the male thread is threadedly engaged with the female thread of the carriage in an adjustable and positionally fixed manner with a thread lead different from that of the female thread. Adjustment of the central plane is thus achieved in this case with the drive spindle stationary.

The invention also contemplates mechanical vises in which, during the clamping operation of the workpiece, one of the clamping jaws or the carriage is under the action of a booster. Particularly in the case of such a structure, it is considered that the only way to adjust the center plane is by moving only one of the tightening jaws relative to the vise body during the tightening operation.

However, according to the invention, a booster is provided for both carriages, which can be actuated by a common crank of the drive spindle. Even in the case of such a structure, it has been found that the accuracy can be significantly improved by using the device of the present invention.If two boosters are used together with one mechanical vise,
It is well known that mechanical vises are limited by relatively large numbers of single parts, and manufacturing errors of the single parts are added.

However, the adjusting device according to the invention makes it possible for the tightening center, in short the center plane, to occupy a precise position.

Furthermore, according to the present invention, position fixing means for fixing the vise body on the base plate is provided. The position fixing means ensure that the vise body is secured on the base plate after adjustment. Also, in the present invention, a bottom plate is provided for arranging the base plates of a plurality of mechanical vises parallel to each other. .

The adjusting device of the invention makes it possible in particular to produce center vises with a minimum tolerance, which in particular makes it possible to arrange several vises in parallel on one machine tool table for mass production of parts. This is particularly advantageous when installed in a horizontal position.

[Example 1 Next, embodiments of the present invention will be explained in detail based on the drawings.

A drive spindle 7 is arranged in the recess 21 of the vise body 1, which is substantially separated from the spindle part 10 and the spindle part 11. The spindle parts 10.11 are each provided with an external thread 8.9, each thread cooperating with a corresponding spindle nut 19.20 of the carriage 2, 3. In this case, the external thread 8 is designed, for example, as a right-handed thread, and the external thread 9 as a left-handed thread, so that depending on the direction of rotational movement of the drive spindle 7, the carriages 2 and 3 move toward each other or away from each other.

The carriage guide, which is also arranged in the recess 21 of the vise body 1, is not shown. The carriage supports clamping jaws 4, 5, in the illustrated embodiment the clamping jaws are attached to different clamping jaws of the carriage in order to be able to adapt the vise to different workpiece dimensions. The position can be fixed at certain parts. However, the invention can also be applied to constructions in which the carriage and the clamping jaw are constructed essentially in one piece.

In the illustrated embodiment, a crank 6, schematically indicated by a dash-dot line, is fitted into a polygonal mounting head 22 at the right end. A clutch (not shown) that operates with a predetermined torque is provided within the sleeve 23. Below this torque, the shaft 24
In addition to the bushing 25 and also the spindle part 11
casing 26 is also interlocked by said polygonal mounting head 22. The casing 26 houses a booster 14 having a construction generally as disclosed in German Patent Application No. 37 08 021.

When the spindle part 11 rotates, the carriage 3 or the clamping jaw 5
It is clear that it moves with the user and is shifted, for example, towards the front (ie towards the left hand).

When the tightening jaw 5 now comes into contact with the workpiece, thereby completing the tightening stroke, the polygonal mounting head 22 and the bushing 25
The torque transmitted between the clutch increases beyond a predetermined value and the clutch is disengaged. Only the shaft 24 then still rotates in the bushing 25 and, because of the thread 27 provided, the shaft 24 is screwed into the bushing 25. The primary member 15 is shifted forward (that is, to the left) via the intermediate piece 69. The pressure roll 28 is pushed into the gap 29 between the two elements 30 and 31. Since the bushing 25 is supported by the step 32 of the counterpart receiver 18, the pressure roll 28 presses the element 30 against the disc spring bundle 33. In this way, the spindle part 11 and the clamping jaw 5 are pressed with a significantly greater force towards the front, that is to say towards the left hand.

A pressure bottle 16 is slidable within the perforation of the element 30, one end of which abuts the primary member 15, and the other end crimped onto the counter pressure rod 12. The pressure rod 12 is located in a bore in the drive spindle 7 and in a borehole in the spindle part 10 as well as in the spindle part 11. The left-hand end of the counter-pressure rod 12 in the drawing is connected to a booster 13 integrated in the casing 34 of the spindle part 10.
It acts on The booster 13 is constructed in substantially the same manner as the booster 14. When the pressure roll 28 of the booster 14 is pushed into the gap 29, the disc spring bundle 35
Power is applied to the carriage 2 via the clamping jaw 5 and the external thread 8, and the clamping jaw 4 is pressed towards the workpiece resting against the clamping jaw 5, ie towards the right hand.

In this case, the element 36 of the booster 13 is supported on a counter support 17 .

The spring 37 serves to push back the counterpressure rod 12 during the return stroke movement to give the pressure roll 28 of the booster 13 a space for return movement, and during this return movement the primary member 38 of said booster 13 also returns. Moving.

Both spindle parts 10 and 11 have mating keyed bushings 40
The two spindle parts are coupled to each other in such a way that they are non-rotatably interlocked but allow axial movement according to the stroke of the boosters 13 and 14.

A corresponding plate 44 is fixed to the left end of the vise body 1 in the drawing. The plate 44 of the corresponding receiver has a female screw hole 48 into which a screw 45 can be screwed. The desired position of the screw is fixed by a headless screw 41.

On the right side of the mechanical vise (FIG. 3), a plate 42 is fixed to the vise body 1 as a corresponding receiver. The corresponding receiving plate 42 is constructed in the same manner as the above-mentioned corresponding receiving plate 44. Compatible receiver is plate 42
A threaded bushing 43 is screwed into the internal threaded bore 47 of the threaded bushing, the step 32 of which forms a mating receptacle for the booster 14.

The screw 45 and the screw bushing 43 can be adjusted in the same way, and the adjusted position is fixed by the headless screw 41, respectively. In this way, the entire drive spindle 7 is connected to the booster 1
3.14 and carriages 2, 3 with tightening jaws 4, 5
is moved in the axial direction of the drive spindle together with the vise body I and thus the base plate 4
Adjustability of the central plane 39 relative to 6 is obtained. In this example, the base plate 46 is constructed integrally with the vise body 1.

In the embodiment shown in Fig. 4 and Fig. 5, the fitting type bushing 4
0 is of two-part construction and consists of coupling elements 49.50. The recoupling element is fastened so that its relative position can be adjusted by two screws 58 which are screwed into the internally threaded bore of the coupling element 49 via elongated slots 59 provided in the coupling element 50 .

This makes it possible to loosen said screw 58 and to rotate the recombination element 49,50 relative to each other and to fix it in a particular position. If desired, the adjusted position 5 can be secured by a dowel pin 60. However, it is also possible to provide, for example, fine interlocking teeth between the recombination elements 49 and 50, so that the recombination elements 49.5
It is also possible to ensure zero adjusted mutual positions.

In the variant embodiment shown in FIG.
A spindle nut 51 in the form of a threaded bushing is provided between and the carriage 3.

In this case, the internal thread 53 of the spindle nut 51 cooperates with the spindle part 11, while the external thread 52 is screwed into the internal thread provided on the carriage 3. Since the thread leads of the male thread 52 and the female thread 53 are different, by rotating the spindle nut 51 an axial movement of the carriage 3 relative to the central plane 39 is obtained. Headless screw 41
is for fixing the adjusted position.

In the embodiment shown in FIGS. 7 to 9, the vise main body l is mounted on the base plate 46 via a groove fitting piece 61. An adjusting screw 63 is mounted in the block 62 on the side 6 of the base plate 46, by means of which the vise body l can be shifted relative to the base plate 46 for adjustment purposes.

The adjusted vise body 1 and the base plate 46 are locked by means of position fixing means 54, 55, 56 which are designed as clamping claws.

The adjustment operation is simplified by the detection dial gauge 64 and the test piece 65.

The entire unit consisting of vise body 1 and base plate 46 is positioned with machine tool table 66 by means of groove-fitting pieces 67 and tightened by means of pawls 68.

If a plurality of such units consisting of base plates and vise bodies are to be stacked, it is preferable to use one common underplate 57 as shown in FIG.

[Brief explanation of the drawing]

1 is a sectional view of a mechanical vise having a device according to the invention;
Figures 1 and 3 are enlarged sectional views of the left and right parts of the vise shown in Figure 1; Figure 4 is a detailed view of the device of the present invention;
FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a sectional view of a variation of the device of the present invention, and FIG. 7 is a partially cutaway front view of the device of the present invention. 8 is a side view of the device shown in FIG. 7, FIG. 9 is a plan view of the device shown in FIG. 7,
FIG. 1O is a partial front view of a variant of the invention. 1... Vise body, 2, 3... Reciprocating stand, 4, 5...
Tightening screw, -6... Crank, 7... Drive spindle 8.9... Male thread, 10.11... Spindle part, 12... Resistance rod, 13.14... Double Power tool, 15
...-legal member, 16...pressure bottle, 17...corresponding receiver, 18...corresponding receiver, 19.20...spin,
Dornut, 21... Recessed portion, 22... Polygonal fitting head, 23... Sleeve, 24... Shaft, 25...
・Bushing 26...Casing, 27...Screw thread, 2
8... Pressure roll, 29... Gap, 30.31
... Element, 32... Step portion, 33... Belleville spring bundle, 34... Casing, 35... Belleville spring bundle, 37
... Spring, 38 ... - Law member, 40 ... Fitting key type bushing, 41 ... Headless screw, 42 ... Compatible receiver is plate, 43 ... Screw bushing, 44 ...・Corresponding receiver is board, 45
...Screw, 46...Base plate, 47.48.
・Female screw hole, 4950 ・Coupling element, 51・
...Spindle nut, 52...Male thread, 53...
・Female thread, 5455.56... Position fixing means as a tightening claw, 57... Bottom plate, 58... Screw, 59.
...Elongated hole slot, 60...Mating pin, 61...Groove fitting piece, 62...Block, 63...Adjustment screw, 6
4...Detection dial gauge, 65...Test piece, 66
...Machine tool table, 67...Groove fitting piece, 68.
...Claw, 69...Intermediate piece 9 9 05 Procedural amendment (method) 111 Brother, April 27, 1991, Palace of the Commissioner of the Patent Office■. 2゜Indication of the case 1990 Patent application No. 205293 Name of the invention Machine vise workpiece center tightening device No. 3゜Amendment Relationship to the case Patent applicant name Saurer Alma Gesellschaft Mitsut Peschlenkter. hafrang

Claims (1)

[Claims] 1. Two carriages (1) movable symmetrically with respect to the central plane (39) of the vise and each having one clamping jaw (4, 5);
2, 3) and the vice body (1) and both carriages (2).
, 3), a device for adjusting the center plane (39) relative to the base plate (46) of the machine vise is provided. A machine vise workpiece center tightening device characterized by: 2. Workpiece center clamping according to claim 1, wherein the vise body (1) is entirely adjustable and movable relative to a base plate (46) configured separately from the vise body. attached device. 3. Axially adjustable counter-receptacle (17) for the drive spindle (7) or for the booster (13, 14) assigned thereto.
, 18) are respectively provided at both ends of the vise body (1). 4. Attach one corresponding receiving plate (4) to each end of the vise body (1).
2, 44) are arranged, and each corresponding receiving plate has a screw (
45) or a threaded bushing (43) are screwed in an adjustable manner, and the drive spindle (7) or the booster (13, 14) is supported on the threaded or threaded bushing. A workpiece center tightening device according to any one of claims 1 to 3. 5. The drive spindle (7) has two spindle parts (1
0, 11), in which the two spindle parts are connected non-rotatably in the working position, but movably in the axial direction, via connecting elements (49, 50), which can be used for adjustment. Dissociated and relatively rotatable,
5. Workpiece center clamping device according to claim 1, wherein the workpiece center clamping device can be fixed again in the adjusted position. 6. At least one carriage (3) has an external thread (52
) and an internal thread (53), the internal thread (53) cooperating with the drive spindle (7) or the associated spindle part (11). and the male thread (52)
according to any one of claims 1 to 5, characterized in that it is screwed in an adjustable and fixable manner onto the internal thread of the carriage (3) with a thread lead different from the internal thread (53). Workpiece center tightening device. 7. For both carriages (2, 3), drive spindle (7)
7. Workpiece center clamping device according to claim 1, further comprising a booster (13, 14) each actuable by a common crank (6). 8. Workpiece according to any one of claims 1 to 7, wherein position fixing means (54, 55, 56) are provided for fixing the vise body (1) on the base plate (46). Center tightening device. 9. Workpiece center clamp according to any one of claims 1 to 8, characterized in that one underplate (57) is provided for arranging the base plates (46) of a plurality of machine vises in parallel with each other. attached device.