EP0115474A2 - Accessory device for machine vices - Google Patents

Abstract

1. Additional device for a machine vice (50) provided with two clamping jaws (12, 13), said device comprising sealed pressure members (40, 45, 45a - 45d ) acting in piston-like manner in a casing block (30, 30a - 30d ) and which are automatically adjustable in the latter with respect to the workpiece to be fixed counter to the restoring force of a displaceable hydraulic fluid, characterized in that the individual pressure member (40, 45, 45a - 45d ) is constructed in one piece and square or rectangular with rounded corners in profile cross-section and is displaceably guided in a chamber (36, 37, 37') of casing block (30, 30a - 30d ) constructed corresponding to the pressure member profile cross-section, the clamping surface (42, 47, 47a - 47d ) facing the workpiece (25) to be fixed is constructed corresponding to the pressure member profile corss-section and is larger than the remaining casing block surface surrounding the individual pressure members, the circumference of the individual pressure member (40, 45, 45a - 45d ) is sealed in the chamber (36, 37, 37') with a packing (41, 46) inserted in a slot (48) and for obtaining an optimum, sealing pressing effect the slot depth (t2 ) in the vicinity of the rounded corners (R) is somewhat less than the slot depth (t1 ) on the facing straight sides of the individual pressure member (40, 45, 45a - 45d ).

Description

The invention relates to an additional device for a machine vice provided with two clamping jaws, the device comprising, in a housing, piston-like, sealed pressure bodies which can be set automatically in the housing against the restoring force of a displaceable hydraulic fluid with respect to the workpiece to be clamped.

From CH-A 348 379 a device is known which is designed for positioning workpieces between the clamping jaws of a machine vice. This device comprises a housing block with a plurality of cylindrical pressure bodies, which are arranged in a row and opposite one another. The pressure bodies each have a conical or rounded head and are arranged in appropriately designed recesses which are connected to one another by ducts and are adjustable in a piston-like manner against the restoring force of a hydraulic fluid located in the recesses and ducts. Due to the largely punctiform clamping action of the individual pressure bodies, this device is suitable for positioning relatively large workpieces, for example with a straight surface and an inclined surface, and for an exact positioning of the work piece several pressure hulls are required. For smaller, for example round workpieces, the individual pressure head is provided with a prismatic recess.

Another device is known from US Pat. No. 4,284,267, which essentially comprises two housing blocks which can be inserted between the two clamping jaws of a machine vice. A plurality of pistons are arranged in series in each housing block and can be adjusted against the restoring force of a hydraulic fluid located in a correspondingly designed recess in the housing block and displaceable by pressure. A cube-shaped pressure body is additionally attached to the front of each piston, the individual pressure bodies provided with their contacting sliding side surfaces being adjustable together with the respective piston. This device is particularly suitable for clamping workpieces with clamping surfaces of irregular shape.

The known devices are not suitable for solving the problem on which the invention is based, which essentially consists in designing a device of the type mentioned at the outset in such a way that workpieces with relatively small clamping surfaces and / or with small, manufacturing-related range tolerances, as well as workpieces with easily deformable surfaces and clamping surfaces exactly in relation can be positioned on a reference surface and, as a result, further machining of the respective workpiece is ensured without any further technical effort.

• - der einzelne Druckkörper einstückig und im Profilquerschnitt quadratisch oder rechteckig mit abgerundeten Ecken ausgebildet und in einer entsprechend dem Druckkörper-Profilquerschnitt ausgebildeten Kammer des Gehäuseblocks verschiebbar geführt ist,
• - die dem einzuspannenden Werkstück zugewandte Klemmfläche entsprechend dem Druckkörper-Profilquerschnitt ausgebildet und grösser als die verbleibende, den einzelnen Druckkörper umschliessende Fläche des Gehäuseblocks ist,
• - der einzelne Druckkörper an seinem Umfang mit einer in einer Nut eingelegten Dichtung in der Kammer abgedichtet ist, wobei
• - zur Erreichung einer optimalen, dichtenden Anpressung die Nuttiefe im Bereich der abgerundeten Ecken etwas geringer als die Nuttiefe an den gegenüberliegend zueinander angeordneten, geraden Seiten des einzelnen Druckkörpers ausgebildet ist.

According to the invention, this object is achieved in that

• the individual pressure element is made in one piece and has a square or rectangular profile cross section with rounded corners and is displaceably guided in a chamber of the housing block designed according to the pressure element profile cross section,
• the clamping surface facing the workpiece to be clamped is designed in accordance with the pressure body profile cross section and is larger than the remaining surface of the housing block which surrounds the individual pressure body,
• - The individual pressure body is sealed at its periphery with a seal inserted in a groove in the chamber, wherein
• - To achieve an optimal, sealing pressure, the groove depth in the region of the rounded corners is somewhat less than the groove depth on the straight sides of the individual pressure element arranged opposite one another.

Further features of the invention will become apparent from the following description in conjunction with the drawing and the claims.

In the case of the additional device according to the invention, the individual pressure body and the associated housing block chamber were designed to be cuboid or rectangular in profile cross section, also taking into account any higher manufacturing costs, in order to achieve a relatively large pressure body clamping surface and exact guidance in the housing block. Tests have shown that workpieces with relatively small clamping surfaces can be clamped exactly in this position, even in any position in the outer clamping area of the pressure body clamping surface, without tilting the pressure body in the housing block. This additional device thus forms a functional clamping element even for workpieces with relatively small, easily deformable surfaces and clamping surfaces.

The invention is described below with reference to the drawing.

• Fig. 1 ein schematisch in Seitenansicht dargestelltes Schaubild eines Maschinenschraubstockes mit eingesetzter Zusatzvorrichtung,
• Fig. 2 eine perspektivische Seitenansicht der Zusatzvorrichtung gemäss Fig.l,
• Fig. 3 die teilweise in demontiertem Zustand und im Schnitt dargestellte Zusatzvorrichtung gemäss Fig. 1,
• Fig. 4 eine perspektivisch dargestellte Variante der aus mehreren Gehäuseblöcken gebildeten Zusatzvorrichtung,
• Fig. 5 einen einzelnen, in Draufsicht und teilweise im Schnitt dargestellten Gehäuseblock der Zusatzvorrichtung gemäss Fig.4, und
• Fig. 6 einen in grösserem Massstab dargestellten Schnitt gemäss der Linie V-V in Fig.5.

It shows:

• 1 is a schematic side view diagram of a machine vice with additional device inserted,
• 2 is a perspective side view of the additional device according to Fig.l,
• 3 shows the additional device shown in FIG. 1, partly in the disassembled state and in section,
• Fig. 4 is a perspective view of the variant additional device formed from several housing blocks,
• 5 shows a single housing block of the additional device according to FIG. 4, shown in plan view and partly in section, and
• 6 shows a section on a larger scale according to the line VV in FIG. 5.

Fig. 1 shows a machine vice designated in its entirety with 5o with inserted additional device 25 for clamping workpieces for machining. Furthermore, FIG. 1 shows a workpiece 2o that can be used according to the dash-dotted line.

The schematically illustrated machine vice 5ö comprises a plate-shaped support member lo with rail-like guides 11, not shown, a first clamping jaw 12 arranged on one side of the support member lo and a bearing block 15 arranged on the other side of the support member lo. Between the bearing block 15 and the first jaw 12 is provided with a second spindle 13 operatively connected to a drive spindle 14. The second clamping jaw 13 can be displaced in relation to the first, stationary clamping jaw 12 by means of the drive spindle 14, which is mounted in the bearing block 15 and can be actuated by a corrugated hand screw 16, as shown in FIG. 1 with the direction of the arrow 1.

In Figure 2, the accessory device is shown in a perspective side view and 25 to recognize a housing block 3o and two spaced apart from each other in the housing block 3o parallelepiped-shaped pressure body 4 _0, 45 having substantially flat clamping surfaces 42,47. The individual clamping surface 42,47 of the respective pressure element is in this case greater than the rest, the pressure body 4o, 45 enclosing the end face of the housing block 3 _0th

FIG. 3 shows the additional device 25, shown partly in the disassembled state and in section, which will be described in detail below.

The housing block 30 provided in the exemplary embodiment shown with two chambers 36, 37 separated from one another by an intermediate wall 34 has two side walls 31, 31 ', a rear wall 32 and an upper and a lower wall 33, 33'. The two chambers 36, 37 are connected to one another by an opening 35. The first at its periphery with a seal 41 provided pressure member 4 ₀ is shown in the inserted state, wherein the second, provided with a seal 46 pressure body is shown in a disassembled state 45th A rubber-elastic round cord seal 41, 46 is provided as a seal for the two pressure bodies 40, 45, which are arranged in corresponding grooves, not shown in FIG. 3 and not designated. A threaded bore 39 is provided in one side wall 31 for filling a suitable hydraulic fluid into the chambers 36, 37 seen, which is sealed with a closure member 38 after the filling process. For the filling process, both pressure elements 4o, 45 are inserted into the chambers 36, 37.

The auxiliary device 25 illustrated and in Figures 1 through 4 advancing described has two mutually spaced pressure body 4 _0, 45, which during the clamping process, depending on the clamping width of the workpiece by displacing the hydraulic fluid from one chamber to the other with uniform contact pressure act against the clamping surface of the respective workpiece. In this case, the hydraulic fluid is pressed into the other chamber by the contact pressure against the clamping surface of the pressure element which is acted upon first, and the associated pressure body is thereby pressed against the workpiece having the smaller span.

4 shows the variant of the additional device, designated overall by 6o, which in the exemplary embodiment shown comprises four housing blocks 3o _a , 3o _b , 3o _c , 3o _d arranged at a distance from one another. The individual housing blocks 30 _a -3o _d are operatively connected to one another via a pipeline 65 and are each provided with at least one chamber (not shown in FIG. 4). A pressure element 45 _a , 45 _b , 45 _c , 45 _{d is} arranged in the chambers of the housing blocks 3o _a -3o _d .

In Figure 5 of a housing block 3 _0a is partially shown in section, which is described below. The housing _{block 30a} provided with a chamber 36 'comprises the side walls 31.31', the rear wall 32 and the upper and lower wall 33.33 '. On the upper wall 33, the pipeline 65 is connected in a manner not shown, which is connected to the chamber 37 'via a hole (not shown) penetrating the wall 33. The pressure body 45a provided with the seal 46 is arranged in the chamber 37 '. The seal 46 is arranged and held in a circumferential groove 48 of the pressure body 45 _a . The housing blocks _b 3o, 3o _{c, d} are formed 3o analog of the housing block 3 _0a described above.

By the pressure body 45 _{d a} -45 substantially sealed chambers of the housing blocks 3oA-3OD are also filled with hydraulic fluid, one of which is as set out in Figure 3 opening shown for filling on the side wall 31 of each housing block, which by the filling process is also sealed with a corresponding closure member.

6 shows, according to the section line VV in FIG. 5, a section of the one pressure element 45 a, shown on a larger scale _, and the groove 48 for the seal 46, which is partly shown, can be seen. The pressure element 45 _a is square or rectangular in profile cross section and an round R at its corners. The groove 48 has a groove depth t ₁ corresponding to the seal 46 on the straight lines G, G 'and a slightly smaller groove depth t ₂ on the curves R with respect to the groove depth t ₁ . The smaller groove depth t ₂ is achieved in that the inner wall W is provided with a radius that is laid outwards. This on the one hand prevents the seal 46 from constricting at the curves R and on the other hand achieves an optimal contact pressure of the seal on the inside 37 "of the chamber 37 '(FIG. 5).

The additional device 6o shown in Figure 4 has four spaced apart housing blocks 3o _a -3o _d . During the clamping process, the individual pressure body 45 _a -45 _d with its clamping surface 47 _a -47 _{d is} pressed _, depending on the span of the workpiece, by moving the hydraulic fluid from one chamber into the other with a uniform contact pressure against the clamping surface of the individual workpieces. In this case, the hydraulic fluid is pressed into the other chamber via the pipeline 65 by the contact pressure against the clamping surface of the pressure body which is acted upon first, and the associated pressure body of the next housing block is thereby pressed against the workpiece having the smaller span.

The pipe 65 connecting the individual housing blocks 3oa-3od to one another can be rigid, flexible and / or variable-length line be formed.

At this point, it should be pointed out that the additional device 25 or 6o can also be provided with a plurality of pressure elements arranged in a row or next to one another, the pressure elements, as shown in more detail in FIGS. 2 and 4, being largely cuboid or not Rectangular shape shown in detail. The chambers in the housing blocks are designed in accordance with the respective pressure body.

In order to achieve an exact clamping or clamping of a workpiece with any shape aligned to a specific reference line or reference surface, the clamping surfaces of the individual pressure bodies are adapted to the workpiece to be clamped in each case and can be flat, prismatic, cambered, concave or the like.

The described additional device 25 or 60 has a diverse range of applications and is suitable for vices, milling, grinding, planing and drilling machines or the like. These additional devices can be arranged fixedly or loosely on one of the two clamping jaws 12, 13 or can be integrated on one of the two clamping jaws.

Claims (3)

1. Additional device for a machine vice (5o) provided with two clamping jaws (12, 13), which device in a housing block (3o, 3o _a -3o _d ) piston-like, sealed pressure body (4 ₀ , 45.45 _a -45 _d ) comprises, which can be set automatically in relation to the workpiece to be clamped in the housing block against the restoring force of a displaceable hydraulic fluid, characterized in that - the individual pressure member (4 ₀ 45.45 _a -45 _d) are integral and in profile cross-section square or rectangular with rounded corners and in a correspondingly shaped pressure body-profile cross-section chamber (36,37,37 ') of the housing block (3 ₀ , 3 _0a - 3o _d ) is slidably guided, - The clamping surface (42, 47 _, 47 _a -47 _d ) facing the workpiece (25) to be clamped _{is designed in} accordance with the pressure body profile cross-section and is larger than the remaining surface of the housing block, which surrounds the individual pressure body, - the individual pressure member (4 ₀ 45.45 _a -45 _d) is sealed at its periphery with an inlaid in a groove (48) seal (41,46) in the chamber (36,37,37 '), wherein - To achieve an optimal, sealing pressure, the groove depth (t ₂ ) in the area of the rounded corners (R) is somewhat less than the groove depth (t _l ) on the straight sides of the individual pressure element (4 ₀ , 45.45 _a -45 _d ) arranged opposite one another. 2. Additional device according to claim 1, characterized in that a plurality of arranged in series and with pressure elements (45, 45 _a- 45 _d ) provided housing blocks (3o, 3o _a -3o _d ) are provided, which are connected to one another by a pipeline (65) Active connection. 3. Additional device according to claim 1, characterized in that the individual housing blocks (3 ₀ , 3 _0a -30 _d ) interconnecting pipeline (65) is designed as a substantially rigid or flexible, variable-length newspaper.

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