GB2317353A - Calibrating machine for spring eyes - Google Patents
Calibrating machine for spring eyes Download PDFInfo
- Publication number
- GB2317353A GB2317353A GB9719375A GB9719375A GB2317353A GB 2317353 A GB2317353 A GB 2317353A GB 9719375 A GB9719375 A GB 9719375A GB 9719375 A GB9719375 A GB 9719375A GB 2317353 A GB2317353 A GB 2317353A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calibrating
- machine
- spring
- eye
- eyes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/12—Attachments or mountings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Springs (AREA)
Abstract
Springs with spring eyes e.g. leaf springs for vehicles are deformed to final size using a mandrel 8, calibrating tools 2,5 and calibrating plate 9 in a pressing operation. The need for machining to final size is therefore avoided.
Description
2317353 Calibrating machine for spring eyes The invention relates to a
calibrating machine for eyes, in particular spring eyes, produced by heat deformation.
Springs with spring eyes are used, in particular, in passenger vehicles and in goods vehicles.
As regards an increase in quality and optimization of weight and cost, a restriction in shape and dimensional tolerances is very important. In the method used up until now, each eye is produced by bending the respective spring end in stages until a wrap angle of 2700 is reached. This results in an eye which does not ensure all-round abutment against the bolt or the like which is to be borne by the eye, for which reason it is necessary is to insert rubber elements.
As precision requirements become more stringent, there then follows high-outlay material -cutting steps, which involve both the inner surface and the flanks of the eye, and thus the width of the latter.
The aim of the invention is to avoid the currently conventional, high-outlay material-cutting final shaping operation and the necessary oversizing which has to be provided at the outset, and thus to be able to produce this spring with smaller allowances. This aim is achieved according to the invention by the features specified in the main claim. This gives rise to a more cost-effective production of the spring. Furthermore, the final shaping of the spring eye is extremely precise in terms of shape and tolerances.
Material-cutting follow-up work on the internal diameter of the spring eye is no longer necessary. At the same time, the reduction in, and dimensional accuracy of, the leaf width in the eye region is achieved, so that no material-cutting follow-up work is necessary. The accuracy of shaping in the longitudinal direction seen in relation to the centre position is likewise ensured.
Freely positionable cylinders, which receive parts of the tools with their guide elements, make it 2 possible to advance up to any desired position. Insertion of the calibrating mandrel and lateral prepositioning by means of calibrating plates means that the spring eye is adequately placed, with the result that final shaping of the diameters by the calibrating tool is ensured. A spring-eye width with narrow tolerances is achieved by bringing the lateral calibrating plates together.
The procedure according to the invention provides that a spring leaf is introduced into the calibrating machine with the preformed spring eye glowing. This is performed by means of an auxiliary device, which will not be described at this juncture. The calibrating machine described is equipped with a two-part tool. Tools with three or more parts may be used if required. Such a is calibrating machine is equipped with five or more cylinders. The top cylinder and the bottom cylinder hold the interchangeable tool. First of all the bottom tool is moved into the calibrating position, after which the lateral calibrating plates are prepositioned. The calibrating mandrel is then inserted and guided through the spring eye. The. top calibrating tool is moved into the closed position, so that the spring eye has to take on the shape of the mandrel. After this step, the calibrating plates are brought to the final dimensions.
The tool is configured such that squeezed material can flow. A-11 the cylinders can -then be moved into their initial position. The entire tool is thus open. The mandrel is subject to thermal loading and, for this reason, a cooling-water system is provided. 30 The invention will be explained in more detail with reference to an exemplary embodiment illustrated in the drawing, in which: Figure 1 shows a side view of a calibrating machine according to the invention for spring eyes; 35 Figure 2 shows a calibrating machine for spring eyes according to Figure 1 in section, the section being taken along the line A-A; Figure 3 shows a calibrating machine for spring eyes according to Figures 1 and 2 in section, the section being taken along the line B-B; and Figure 4 shows a calibrating machine for spring eyes according to Figures 1 - 3 in section, the section being taken along the line C-C. 5 The calibrating machine for spring eyes comprises a machine frame 1, a bottom calibrating tool 2, a bottom tool mount 3, a bottom cylinder 4, a top calibrating tool 5, a top tool mount 6 and a top cylinder 7. The guides are provided by guide rods 17 and sliding bearings 16 in conjunction with a tool plate 18.
A mandrel 8 and a calibrating plate 9 are advanced by means of a cylinder 10 and a push rod 11, and the mandrel 8 is then pushed through the spring eye into a further calibrating plate 12, which is located opposite is the first-mentioned calibrating plate. The calibrating plate 9 is positioned with a cylinder 13 and the calibrating plate 12 is positioned with a cylinder 14. The cooling medium for the calibrating mandrel is supplied to the calibrating mandrel through a bore 15.
4
Claims (6)
1. Calibrating machine for eyes, in particular for spring eyes, produced by heat deformation, in which machine the spring eye is deformed in one operation such that material-cutting machining for the eye diameter and for the eye width is dispensed with.
2. Calibrating machine according to claim 1, wherein the machine comprises a calibrating mandrel which is mounted in a non-floating manner.
3. Calibrating machine according to claim 1 to 2, wherein the machine comprises calibrating plates which are prepositioned.
4. Calibrating machine according to claim 3, wherein the calibrating plates are arranged to determine the eye width.
5. Calibrating machine according to claim 2 further comprising a cooling system for the calibrating mandrel.
6. Calibrating machine for eyes substantially as hereinbefore defined with reference to the accompany drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1996138806 DE19638806A1 (en) | 1996-09-20 | 1996-09-20 | Calibrating machine for spring eyes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9719375D0 GB9719375D0 (en) | 1997-11-12 |
| GB2317353A true GB2317353A (en) | 1998-03-25 |
| GB2317353B GB2317353B (en) | 1999-07-14 |
Family
ID=7806490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9719375A Expired - Fee Related GB2317353B (en) | 1996-09-20 | 1997-09-11 | Calibrating machine for spring eyes |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE19638806A1 (en) |
| GB (1) | GB2317353B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB508907A (en) * | 1938-05-24 | 1939-07-07 | Frederic Lloyd | Improvements in or relating to springs |
| GB1316695A (en) * | 1970-06-01 | 1973-05-09 | North American Rockwell | Spring leaf and method of making |
| GB1320054A (en) * | 1970-06-01 | 1973-06-13 | North American Rockwell | Spring leaf |
| US4173884A (en) * | 1978-02-15 | 1979-11-13 | Dobinson Reginald P | Forming machine for bending metal bars |
-
1996
- 1996-09-20 DE DE1996138806 patent/DE19638806A1/en not_active Withdrawn
-
1997
- 1997-09-11 GB GB9719375A patent/GB2317353B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB508907A (en) * | 1938-05-24 | 1939-07-07 | Frederic Lloyd | Improvements in or relating to springs |
| GB1316695A (en) * | 1970-06-01 | 1973-05-09 | North American Rockwell | Spring leaf and method of making |
| GB1320054A (en) * | 1970-06-01 | 1973-06-13 | North American Rockwell | Spring leaf |
| US4173884A (en) * | 1978-02-15 | 1979-11-13 | Dobinson Reginald P | Forming machine for bending metal bars |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19638806A1 (en) | 1998-03-26 |
| GB2317353B (en) | 1999-07-14 |
| GB9719375D0 (en) | 1997-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020911 |