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Agathon Fine Centering Plus
Standard: 7995 - Short stroke applications
The smooth-running, rolling Agathon fine centering Plus consists of a centering pillar with roller cage. It ensures very precise guidance and high load capacity as soon as the first row of rollers is reached. The integrated cage positioning system allows it to be extended from the preload. Manufactured from hardened, wear-resistant roller bearing steel, it is suitable for the mass production of high-precision parts.The short-stroke standard series can be used to guide a venting stroke or to guide the wiper plate.
Advantages
- Backlash-free and therefore highly precise
- Guide bushing equipped with stop
- High design freedom for the mold designer thanks to free positioning
- Durable - mass production
- Short cycle times
- High initial load-bearing capacity right from the centering start
- No noticeable abrasion - suitable for clean room production
- Temperature-resistant up to approx. 150° C
- Low overall costs, also thanks to cost-effective production of the cylindrical locating bore
- Minimum quantity lubrication, therefore little to no maintenance
Innovation
How is it used...
The demands on tools are constantly increasing, both in clean room production and for technical plastic parts. Thanks to its rolling and preloaded rollers, the patented Fine Centering Plus enables low-wear operation with maximum precision. As a result, tool halves are closed precisely, slides move synchronously without jerking and the plastic parts are carefully demolded. Depending on the space available and the forces involved, two or more Fine Centering Plus units can be used. The designer is free to choose the arrangement; the load capacity and the desired service life are decisive for the number of Fine Centering Plus units installed.
The short-stroke standard series 7995 is used for guiding plates.
Features and benefits
Concepts in comparison
Advantages of Agathon centering
- Thanks to the precise axial positioning of the roller cage, two rows of rollers are brought into preload in quick succession during the centering start - this ensures a high initial load-bearing capacity and a long service life. The initial load capacity corresponds approximately to the load capacity of 16 rows of balls
- Low wear due to rolling centering. In contrast, with conventional flat centering (cubic centering), the centering start begins with an almost pure line contact. The surface pressure p exceeds the permissible value (pzul) several times over. Only after sufficient overlap of the centering surfaces does the surface pressure fall below a critical value. Only then does a low-wear "gliding" movement occur.
- The service life can be extended by turning the fine centering unit by 120 ° -180 ° in each case
- Temperature-resistant up to approx. 150° C
- Low overall costs, also thanks to cost-effective production of the cylindrical locating bore
- Little to no maintenance, can be used with minimum quantity lubrication
- The designer is free to choose the arrangement and number of fine centering units installed
Thermal expansion
Thermal expansion in the injection mold
Thermal expansion in the injection mold
- Case study: asymmetrically tempered mold, ΔT = 50 K
- Temperature: ejector side 90 °C; nozzle side 40 °C
- Actual offset is reduced by a factor of 3-5 due to heat transfer at the mold parting line!
- Analyzed offset at the separation: 6.2 µm. The Agathon Fine Centering Plus can therefore be used without hesitation
Conclusion:
No problems with thermal expansion are to be expected with homogeneously tempered tools up to ΔT of 30 K.
Supplied with: 1x cap screw for guide column and 2x holding pieces incl. cap screw for guide bush. Materials of bushings, rollers: 100Cr6 - 1.3505, hardened 62 to 64 HRC; centering column: 16MnCr5, hardened 61 to 63 HRC.
Technical data
d1
=
Centering pillar, diameter tolerance ISO h3, superfinish ground
d3
=
Outer diameter of the centering pillar and flanged bushing for fit js4/H5(H6)
d4
=
Pitch circle for fastening elements (clamps A-8001.000.001), fastening thread: M6x18
d5
=
Outer diameter of the flanged bushing
a1
=
Installation space for the fastening elements, alternative arrangement: 120°
d7
=
Center hole for fastening the guide pillar, incl. auxiliary thread for removal
l1
=
Nominal length of the closed fine centering
l2
=
Overall length of the centering bushing
l3
=
Installation depth of the centering bushing
l4
=
Total length of the centering pillar
l5
=
Entry into the centering (preload), or the guided distance
l6 (mm)
=
Pillar immersion depth
Entrance C
=
Basic dynamic load rating in N - Initial load capacity
Closed C0
=
Basic static load rating in N - Tool closed
Installation area for Agathon Fine Centering Plus
Accuracies and boundary conditions
| Position accuracy: Locating holes for pillar and bushing maximum 0.005 mm position deviation. The adjustment of the sliding elements must be carried out accordingly on the closed tool so that no radial forces act on the fine centering. Perpendicularity: Bushing and pillar axis to the tool parting surface maximum 0.005 mm per 100 mm deviation. Installation depth: The flatness of all axial contact surfaces of the bores for the centering units must not vary by more than 0.05 mm. Boundary conditions: An offset of maximum 0.15 mm can be centered with the Fine Centering Plus 7990. Ideally < 0.05 mm, pre-centered by the main sliding guide / pillar. Centering bush and centering pillar are matched to each other. Ensure that they are always installed together as a pair. Solutions for multi-component tools on request. |
Maintenance Finecentering Plus
Maintenance of the Agathon Fine Centering Plus
- After delivery: Remove rust inhibitor from the fine centering
- During maintenance: Remove old grease without leaving any residue
- Apply new grease to the cage of the fine centering device - see catalog for recommendations
- For clean room applications, excess grease can be wiped off with a lint-free cloth
- Centering elements must be replaced if there is no longer any preload. Preventive replacement as part of normal maintenance is advisable
| Application type 1 | Center, Lead |
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