Concentric clamping elements

Hydraulic clamping elements for concentric clamping

for interior or exterior clamping

Series  (4)

Items  (67)

  1. Ø16 x 6 mm stroke – centre height 52 mm – max. 500 bar, as per data sheet H4.300
  2. Ø25 x 8 mm stroke – centre height 71 mm – max. 500 bar, as per data sheet H4.300
  3. Ø32 x 8 mm stroke – centre height 87 mm – max. 500 bar, as per data sheet H4.300
  4. Ø16 x 6 mm stroke – centre height 52 mm – max. 500 bar, as per data sheet H4.300
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Description

Concentric positioning and clamping elements H4.300

Concentric positioning and clamping with two or three-jaw chucks on stationary fixtures is nothing new. In many applications, however, it is not possible to place the relatively large chuck bodies on the fixture. Often the smaller clamping strokes are an additional obstacle.

In our development, the individual parts can be connected to a two or multiple-element version. In the multiple-jaw version, each pair of jaws clamps independently of the remaining ones, thereby concentric clamping is obtained.

The opening can be determined by means of a connecting bar. The clamping strokes of the several sizes are designed such that manual or automatic loading and unloading can be effected also to clamp blanks with large tolerances. Also single-acting elements are available on request.

double clamping element for concentric interior clamping
double clamping element with prolonged connecting bar for exterior clamping
double clamping element with crossing for 4 elements
interior and exterior clamping
active principle of the concentric clamping element H4.300

Concentric positioning and clamping elements H 4.305

Workpieces with cast or machined bores, reliefs or break-outs, can be easily loaded to the fixture with the concentric positioning and clamping elements and concentrically clamped or positioned for machining. Overtolerance conditions can be avoided and clamping tasks can be completely solved by an ingenious combination of 2 and 3-point elements.

Various mounting and connecting possibilities extend the use for multiple applications. Different sizes and correspondingly adapted contact bolts allow exact adaptation to the required clamping diameter.

2-point concentric positioning and clamping element H4.305
3-point concentric positioning and clamping element H4.305
cross section concentric positioning and clamping element H4.305
principle of concentric positioning and clamping

Concentric clamping elements H4.306

This hydraulically-operated concentric clamping element can be equipped with especially low clamping jaws to receive workpieces with interior centrings of low depth.
Suitable workpieces can directly rest on the clamping jaws so that additional support points are not required. With a combination of 2 and 3-point elements, workpieces with 2 centring holes can be exactly positioned.

Concentric clamping elements H4.306
Special features of the concentric clamping elements H4.306

Positive air pressure connection

The standard positive air pressure protection keeps the hole centre free of swarf, so that the base jaws can freely return.

Pneumatic stroke end control

The positive air pressure protection can also be used for the control of the unclamping position. The returning base jaws close in their end position the bore hole of the positive air pressure connection.

Optional contact control

In the version with contact control, pneumatic pressure is supplied to one of the base jaws, which is then transmitted into the clamping jaw.
In the crowned clamping surface there is a small bore hole. If a workpiece is clamped correctly, it closes the bore hole.

Application videos:

Parallel slide centring elements H 4.307

This element is used in clamping systems in order to centre workpieces with small complicated contours and ribbing serving as a base for the definition of tolerances.
By a clever arrangement of the centre of rotation to the hydraulic piston the retaining force of a clamping jaw is three times higher than the clamping force. If only one clamping jaw acts at the workpiece, the clamping force is twice as large. This happens as long as the workpiece is moved to the centre.

principle of the double-acting parallel slide centring element H4.307

PDF Data sheets

PDF

Concentric positioning and clamping elements with variable range of clamping – hydraulically operated – double acting – max. operating pressure 500 bar

Catalogue sheet H4.300
PDF

Concentric positioning and clamping elements 2 and 3-point positioning – double acting – hydraulically operated – max. operating pressure 250 bar

Catalogue sheet H4.305
PDF

Concentric clamping elements 2 and 3-point interior clamping – for interchangeable clamping jaws Ø 16 – 121 mm – double acting – max. operating pressure 250 bar

Catalogue sheet H4.306

Application examples

Application videos:

Application example 1

Concentric positioning and clamping elements H4.300 
The flexible clamping unit is used to clamp bars which can be machined in every position, e.g. drilled, milled, threaded, etc. In conjunction with a pneumatic two-jaw chuck the rotary indexing table is used to determine the machining position of the workpiece.
The two-jaw chuck and the right-hand concentric clamping element keep the bars in the exact working position. The floating clamping element in the centre supports the bar. For this purpose it must work in a floating way, that means without centring function, what can be obtained by omitting the connecting bar. (Available on request)

clamping unit to clamp bars

Application example 2

Parallel slide centring elements H4.307
The opposite figure shows a hydraulically-operated fixture for concentric positioning and clamping of two cast housings, whose interior surfaces are due to functional reasons have to be concentrically arranged to the machined holes.
The machining of the interior surfaces could be avoided thanks to the use of concentric clamping elements.

concentric positioning and clamping of two housings

Application example 3

Parallel slide centring elements H4.307
The clamping fixture in plate construction installed on a vertical machining centre with rotary indexing table and trunnion bearing.

vertical machining centre with clamping fixture in plate design