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RU-2861287-C1 - MACHINE VICE

RU2861287C1RU 2861287 C1RU2861287 C1RU 2861287C1RU-2861287-C1

Abstract

FIELD: metal working. SUBSTANCE: invention can be used in devices of clamping fixtures, for example, for installing and securing workpieces on multi-axis CNC milling machines. The vice comprises a base on which a movable support assembly with a jaw mounted thereon is located, a fixed support assembly with a jaw mounted thereon and a lead screw for moving the movable support assembly. The vice is equipped with an additional clamping unit installed in the movable support assembly, and a tubular composite shaft installed in said support assemblies under the jaws and made of movable and fixed parts connected to each other by a telescopic connection with the ability to linearly move the movable part relative to the fixed part, wherein the lead screw is installed inside the composite shaft and is screwed at one end into the fixed part of the composite shaft, and at the other end has the ability to interact with the movable part of the shaft, wherein the additional clamping unit is made in the form of a cam having a protrusion on one side and an ellipsoid surface on the other side, and a lever interacting with each other, and the jaws are installed on quick-release mechanisms rigidly fixed respectively on the upper parts of the lever and the fixed support assembly, wherein the lever is installed with the ability to interact with the jaw of the movable support assembly through the quick-release mechanism of the jaws installed in the upper part of the lever, and the cam is installed with the ability to interact with its protrusion with the movable part of the composite shaft and with its ellipsoid surface with the lever, wherein the movable support assembly is configured to be rigidly fixed to the base. EFFECT: possibility of precision machining of workpieces under complex load conditions. 4 cl, 4 dwg

Inventors

  • Novgorodov Andrei Vladimirovich

Dates

Publication Date
20260504
Application Date
20251003

Claims (4)

  1. 1. A machine vice comprising a base on which a movable support unit with a jaw mounted thereon, a fixed support unit with a jaw mounted thereon and a lead screw for moving the movable support unit are arranged, characterized in that they are provided with an additional compression unit installed in the movable support unit and a tubular composite shaft installed in said support units under the jaws and made of movable and fixed parts interconnected by a telescopic connection with the possibility of linear movement of the movable part relative to the fixed part, wherein the lead screw is installed inside the composite shaft and is screwed at one end into the fixed part of the composite shaft, and at the other end has the possibility of interacting with the movable part of the shaft, wherein the additional compression unit is made in the form of a cam interacting with each other, having a protrusion on one side and an ellipsoidal surface on the other side, and a lever, and the jaws are mounted on quick-release mechanisms rigidly fixed respectively on the upper parts of the lever and the fixed support unit, with In this case, the lever is installed with the possibility of interaction with the jaw of the movable support unit through a quick-release jaw mechanism installed in the upper part of the lever, and the cam is installed with the possibility of interaction with its projection with the movable part of the composite shaft and its ellipsoidal surface with the lever, and the movable support unit is designed with the possibility of rigid fixation to the base.
  2. 2. A vice according to item 1, characterized in that the upper part of the lever is wedge-shaped.
  3. 3. A vice according to paragraph 1, characterized in that the magnitude of the elastic deformation of the lever at maximum clamping force is 0.3-0.4 mm.
  4. 4. A vice according to item 1, characterized in that the quick-release mechanisms of the jaws have a spring-loaded ball and a mating hole in the jaws.

Description

The invention relates to the field of mechanical engineering, namely to clamping devices for installing and fastening workpieces on 5-coordinate (5-axis) CNC milling machines, in particular to the design of mechanical vices and clamping devices, and can be used in production for precision machining of critical parts. Standard machine vises are commonly used for mounting on the table of 5-axis machining centers. Their main drawback for this type of machining is the lack of control over the workpiece clamping force. The workpiece clamping force can fluctuate during machining; during 5-axis machining, the cutting force vector constantly changes direction, creating overturning moments for which standard vises are not designed. Compressing the workpiece material and risking workpiece shifting during machining can also occur if the weakened jaw force is not compensated for by additionally tightening the threaded shaft to maintain the required jaw clamping force. The "5-axis eccentric vice" manufactured by Röhm GmbH is well-known. Source: https://www.roehm.biz/ru/produkty/tiski/rvm-5-axis-azentric-vice/. It includes a base, movable and fixed support blocks, a spindle with a bearing support for generating clamping force, and quick-change jaws. The spindle in this device refers to the rotating shaft. The KIPPflexX 5-axis vise from Heinrich Kipp Werk is well-known. Source: https://alterv.ru/catalog/tiski_kippflexx_dlya_5_osevoy_obrabotki/k1555_tiski_kippflexx_dlya_5_osevoy_obrabotki/. It includes clamping jaws, a clamping element with a nut, extension shafts and set screws, a positioning element, a clamping element, a base plate, and a stop pin for pre-centering. The KSX-C2 5-axis vise with adjustable clamping center, extended clamping stroke, and active jaw lowering is well-known. Source: https://schunk.com/de/en/workpiece-clamping-technology/manual-clamping-systems/5-axis-vise/ksx-c2/c/PGR_5454. It includes a base, movable and fixed support jaws, a clamping lever, a positioning holder, an internal screw, and brackets. Clamping of the workpiece in the vise is ensured solely by mechanical tension of the threaded spindle, the compressive force from which is transmitted directly through the jaws to the clamped part. A drawback of existing technical solutions is the occurrence of workpiece material compression, which leads to the risk of workpiece shifting during machining unless the weakened jaw force is compensated for by additionally tightening the threaded spindle to ensure the required jaw clamping force. All existing solutions lack an additional clamping unit. The technical problem that the invention is aimed at solving is the elimination of the above-mentioned disadvantages, increasing the accuracy of workpiece processing on a 5-axis machine by eliminating the possibility of its shift or micro-shift during processing due to the implementation of an additional compression system. The technical result consists in ensuring the possibility of precision machining by regulating the final clamping force of the workpiece and preventing its shift in both the vertical and horizontal directions under complex force loads characteristic of 5-axis machining. In order to achieve the technical result in a machine vice comprising a base on which a movable support unit with a jaw installed thereon, a fixed support unit with a jaw installed thereon and a lead screw for moving the movable support unit are arranged, according to the invention, they are provided with an additional compression unit installed in the movable support unit and a tubular composite shaft installed in the mentioned support units under the jaws and made of movable and fixed parts connected to each other by a telescopic connection with the possibility of linear movement of the movable part relative to the fixed part, wherein the lead screw is installed inside the composite shaft and is screwed at one end into the fixed part of the composite shaft, and at the other end has the possibility of interaction with the movable part of the shaft, wherein the additional compression unit is made in the form of a cam interacting with each other, having a protrusion on one side and an ellipsoidal surface on the other side, and a lever, and the jaws are mounted on quick-release mechanisms rigidly fixed respectively on the upper parts of the lever and the fixed support unit, wherein the lever is installed with the possibility of interaction with the jaw of the movable support unit through a quick-release jaw mechanism installed in the upper part of the lever, and the cam is installed with the possibility of interaction with its projection with the movable part of the composite shaft and its ellipsoidal surface with the lever, and the movable support unit is designed with the possibility of rigid fixation to the base. The upper part of the lever is wedge-shaped. The magnitude of elastic deformation of the lever at maximum clamping force is 0.3-0.4 mm. Quick release jaw mechani