EP1427568A1 - Method and device for grinding central bearing positions on crankshafts - Google Patents

Method and device for grinding central bearing positions on crankshafts

Info

Publication number
EP1427568A1
EP1427568A1 EP20020777056 EP02777056A EP1427568A1 EP 1427568 A1 EP1427568 A1 EP 1427568A1 EP 20020777056 EP20020777056 EP 20020777056 EP 02777056 A EP02777056 A EP 02777056A EP 1427568 A1 EP1427568 A1 EP 1427568A1
Authority
EP
European Patent Office
Prior art keywords
grinding
crankshaft
bearing
ground
grinding wheel
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
Application number
EP20020777056
Other languages
German (de)
French (fr)
Other versions
EP1427568B1 (en
Inventor
Erwin Junker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Holice AS
Original Assignee
Erwin Junker Maschinenfabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE2001144644 priority Critical patent/DE10144644B4/en
Priority to DE10144644 priority
Application filed by Erwin Junker Maschinenfabrik GmbH filed Critical Erwin Junker Maschinenfabrik GmbH
Priority to PCT/EP2002/010135 priority patent/WO2003022521A1/en
Publication of EP1427568A1 publication Critical patent/EP1427568A1/en
Application granted granted Critical
Publication of EP1427568B1 publication Critical patent/EP1427568B1/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/06Work supports, e.g. adjustable steadies
    • B24B41/065Steady rests
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36Single-purpose machines or devices
    • B24B5/42Single-purpose machines or devices for grinding crankshafts or crankpins
    • B24B5/421Supports therefor

Abstract

The invention relates to a device for the grinding of central bearing positions on crankshafts with several grinding discs employed simultaneously. An additional machining unit (11) for the pre-working of at least one central bearing position (2) on the crankshaft (1) is provided to form a bearing seat for the collar (3). The invention further relates to a method of grinding central bearing positions (2) on crankshafts (1), in which a bearing seat for a collar (3) is pre-worked before the process of the final precision grinding.

Description

Nerfahren and apparatus for grinding of center bearings of

crankshafts

The present invention relates to a device for the grinding of center bearings called, of crankshafts. In particular, the invention relates to a device for performing such a method.

For performing grinding of center bearings or main bearings of crankshafts in large series are among other various options available.

Thus, the center bearings, for example, by Ben Einzelschleifschei- ready to be ground, but this is associated with a significantly higher grinding time, as each main bearing is processed individually. In addition, a relatively complicated Masclimenkonstruktion needed to provide the flexibility of such a grinding process.

Moreover, it is known, but not widely used in high-volume, perform these bearings on the crankshafts by means of the so-called. "Centerless" -Schleifens.

The large-scale production technically next furthest used method involves the so-called. Multilayer grinding, wherein a plurality of grinding wheels of a grinding spindle come simultaneously into engagement with the crankshaft to said positions of the respective main bearing. The next purpose machines used are well known and have a constitution such that on a machine bed, a feed unit is constructed by a grinding spindle and a Abrichtvor- direction. The dressing is preferably delivered linearly in the direction of an axis which is transverse to the main axis or center axis of rotation of the crankshaft. In the front area of ​​such a grinding machine, a grinding table is arranged, which is either fixedly mounted on the machine bed, or can be moved by means of a CNC-axis in the direction of an axis that is transverse to the feed axis and parallel to the axis of rotation. On this grinding table, a workpiece headstock and a tailstock are constructed, wherein the workpiece spindle includes workpiece spindle. The workpiece spindle is known to the receiving of a chuck or a driver for the crankshaft. The tailstock is likewise mounted on the grinding table and manually adjustable for setting different lengths of the crankshaft. A tailstock can be automatically moved forward for loading and unloading the crankshaft and withdrawn, as is well known from conventional RundscWeifmaschinen.

For the clamping of the crankshaft, which takes place headstock side, the possibilities of either a floating entrainment system or centrically clamping chucks. By means of a motor of the workpiece headstock and the crankshaft is set into rotation. The tailstock sleeve is provided with a corresponding counter-tip, which is generally carried out as so-called. Projecting tip. Between the workpiece headstock and the tailstock sleeve is then added to the crankshaft at their centers between the respective tips, thereby ensuring that the central axes of the workpiece spindle on the one hand and the tailstock on the other hand is aligned exactly with the cen- eral axis or axis of rotation of the crankshaft.

For accurate monitoring of the grinding process, the workpiece during the grinding by means of two instruments is measured automatically in real time and corrects the machine accordingly. In the above multi-bearing grinding process are usually corundum, especially in crankshaft manufacturing, widespread. These machines are characterized in that they comprise a wear amount of about 1.100 mm to 600 mm in the grinding wheel diameter. It can be assumed that every 20 to 30 ground crankshafts must be dressed and the dressing amount in the order of about 0.03 mm.

In the method of the multilayer grinding, it is advantageously possible to grind center bearings and main bearings, having lateral undercuts, ie, are in this case no ground plane sides. Moreover, it is also possible with- zuschleifen main bearings with lateral radius transitions to this page plan and the plan page on this main bearing with a height of about 4 to 5 mm.

The grinding of such main bearings with lateral radius transitions and any face sides turns out to be considerably more difficult, since the process behaves much more critical here with respect to the upcoming used grinding technology.

Moreover, it is also possible with the method of the multilayer grinding of crankshafts, the grinding of the center bearings and main bearings with and without lateral radius transitions and any face sides perform, as well as the grinding of center sections on the flange or pin, although at these centric no flat surfaces portions of the flange and the spigot are also ground.

Depending on the size and configuration of a crankshaft to be ground in grinding with corundum already come due to the generated by the grinding wheels grinding pressure on the crankshaft for supporting the same while grinding lunettes used. This problem of increased grinding pressure with accompanied increased cutting forces in appearance also occurs in the so-called. CBN grinding wheels, as must be driven with them increased metal removal rates in order to make the grinding process economically in general. However, this is not only in the required cycle time desirably is to be achieved, but also in the properties of the CBN grinding wheel itself. CBN grinding wheels, preferably those that are vitrified bonded and have a coating of approximately 5 mm, have on the one hand the advantage that with them a higher metal removal rates can be driven are, however, on the other hand connected to the disadvantage that the cutting forces are higher due to the specification of the grinding wheels, causing the entire grinding process designed technically much more difficult.

However, a major advantage of grinding with CBN grinding wheels is that increased metal removal rates can be driven and that the dressing cycles increase by approximately tenfold, which means are lower that the main and secondary times, even relative total in the manufacture of a crankshaft. This increased output performance of crankshafts in relation to the unit of time is possible.

Although the use of such CBN grinding wheels is desirable due to the increased grinding pressure during grinding, however, especially the sanding of the crankshaft in the region of a main bearing turns out until at least the pitching of the Abstützlünette particularly problematic as abrasive technically.

Starting from these considerations, it is the object of the present invention to develop a method and an apparatus with which a considerable improvement with respect to the grinding of the steady goes hand in hand.

This object is achieved with a device according to the features of claim 1 and a method according to the features of claim 8. Basically, it is during the grinding of the steady of considerable importance that this first, a very good concentricity with respect to the to be ground main bearing and secondly has a very good roundness in this regard.

According to the invention the apparatus is characterized therefore by the fact that an additional processing unit is provided for preliminary work at least a central bearing of the crankshaft, which is provided for the final operation of the multilayer grinding as a bearing seat for pitching a bezel.

Preferably, in the processing unit by an additional grinding unit with at least one grinding wheel for grinding processing of the provided for the Lünettenlagersitz central bearing of the crankshaft.

Here, it is advantageous if the at least one grinding disc of the machining unit has a narrower width than the width of the central bearing point, so that such a wide ground running track is generated for the bezel on the main bearings that the steady jaws can be recognized easily. Here, the ground running track, which is generated through the narrow grinding wheel must be at least about 2 mm wider than the steady jaws themselves. This procedure is mainly used in applications where the main bearings must be sanded with corner radii.

According to the invention, the additional processing unit of the crankshaft is either fed or pivoted to this, when the grinding spindle to the final multilayer grinding the crankshaft is in non-engagement position with the crankshaft.

According to the invention, the multilayer grinding is performed so that the bearing point is prior to grinding of the center bearings to their final dimensions at least ground forth, to serve as a bearing seat for a bezel. That is, all processing steps are carried out at a single clamping of the workpiece.

To this end, there are according to the invention, two fundamentally different possibilities. When grinding main bearings with lateral undercuts, in which the face side of the main bearing is not ground, this procedure is possible without the use of a so-called. Additional grinding device, as previously described in connection with the inventive device. Here, it is required that on a main bearing of the crankshaft at the pre-processing means of eddy milling or turning stops an increased contour so that then this increase is ground first during the subsequent multilayer grinding in a ScWeifmaschine for multilayer grinding. The increase has to represent at least the width of the steady rest to be produced, which increase must already be sanded clean before an adjoining main bearing is machined with the grinding wheel set. In other words, it can also be achieved here in terms of the required accuracy in concentricity and roundness of the steady optimal values. the bezel is set then milled on this lane, and subsequently the grinding wheel set of the grinding spindle is further fed in the feed direction and the or each main bearing up to the final finish-ground finished size.

Another possibility is, as previously described in connection with the apparatus, grind the steady rest to be applied by means of a grinding wheel, wherein an additional grinding device comes within the grinding machine used.

In both cases, the bezel is always tracked for proper thrust bearing during the multilayer grinding to the final dimensions of the bearing according to the invention, in which measurement devices measure the crankshaft during the process table automatically, so that the grinding process can be virtually identical driven to grinding with corundum.

In the following, the method and the apparatus will be explained in more detail according to the invention in the course of the description of the exemplary embodiments illustrated with reference to the accompanying drawings. Show it

Figure 1 is a schematic plan view of a grinding cell of the device according to the invention when grinding the steady;

Figure 2 is a simplified schematic side view showing the

Arrangement of the individual grinding wheels;

Figure 3 beiwelle a schematic plan view when multilayer grinding of the spa;

4 shows a simplified schematic side view with swiveled

Additional grinding device;

5 shows an engagement of the grinding wheel for grinding bearing points with lateral radii; and

6 shows a grinding a steady seat at a bearing point with pre-machined increased running track.

1 shows a simplified illustration is shown in the form of a plan view, a crankshaft 1 with the clamping position and the wheel set 12 is shown. 13 The crankshaft 1 is accommodated in the center of the crankshaft 1 in a floating chuck 6 with a tip 8 and is positioned by a longitudinal stop 7 in its length. The floating jaws of chuck rafter 6 span the crankshaft 1 at its flange, so that the radial driving is ensured for grinding.

On the side of the tailstock, the crankshaft 1 is also taken up by a centering point 9, so that the crankshaft 1 at both ends is received in their already machined centering and tensioned, thereby being positioned in their position and voltage accurately for grinding.

Furthermore, the built-up on the grinding table measuring devices 4 and 5 are shown, but which do not engage the crankshaft when grinding the steady.

The bezel 3 is also built up on the grinding table, but is located at the grinding of the steady not necessarily with their jaws on the workpiece created.

The crankshaft 1 includes a plurality of main bearing 15, namely in the present example I, II, III and IN. The grinding of the steady occurs in the representation shown in Figure 1 to the concentric circumferential main bearing II.

Here, a processing unit 11 takes the form of an additional grinding device used, which is preferably formed with a spindle unit in the form of a motor spindle. This spindle motor takes in the front region at its nose to a grinding wheel spindle 10th

In order for this ZusatzscMeifeinrichtung 11 can be pivoted to the crankshaft, it must be parallel to the Z axis are showing the CΝC-Nerfahrachse the grinding table and the grinding wheel 13 must be by means of the X-axis, which serves for the infeed of the wheel head 12, moved clear , Thus, the crank shaft 1 need not be moved in the direction of the X axis, the grinding of the steady these additional grinding device is pivoted 11 in such a way that the narrow grinding wheel 10 arranged for grinding the steady substantially centrally in front of a grinding wheel 13 of the grinding wheel movement of the grinding spindle 12 is. The X-axis, which serves for moving the wheel head on which the additional grinding device 11 is structured, is used, the grinding wheel 10 of the crankshaft can be delivered.

In the figure, 1 is further shown the grinding spindle 12 having an exactly parallel to the crankshaft central axis 14 about which the loop discs 13, for machining the main bearing I to IV, are rotatable.

The main bearing to be ground to the crankshaft 1 are indicated by the reference numeral 15 °.

To keep the mean pressure during the grinding of the steady low as possible, that the grinding wheel 10 has a width of approximately 10 to 12 mm, wherein the steady jaws, for example, about 8 mm wide. As grinding means for grinding the steady, for example, a grinding wheel made of corundum or a CBN grinding wheel can be used.

In the present example, the additional grinding device 11 is described as a swivel-unit. However, it is also possible to use these additional grinding device 11 at any position within the grinding machine either retract or to swing.

In the figure 2 is a highly simplified side view is shown in the region of the main bearing II of FIG. 1 The grinding wheel 10 for grinding the steady is arranged in front of a grinding wheel 13 of the grinding spindle 12th On average, the crankshaft 1 is shown. As can be seen, the central axes of all the grinding wheels 10 and 13 and the central axis of the crankshaft 1 are aligned in parallel, said central axes preferably lie in a horizontal plane.

3 shows the final process of the multilayer grinding of the bearings I is now shown to IN, which will now be sanded time parallel. This is mandatory, because all the wheels are on the grinding spindle 12, which is supported on both sides, was added. 13 The grinding wheel set is delivered by means of the X-axis CNC-controlled. While the multilayer grinding the bezel is hired three with her cheeks now at the main camp II, so that the "workpiece during the grinding process is very well supported. In order to achieve on the crankshaft 1 exact diameter of the main bearing, each represents a diameter-measuring head 4 and 5 are preferably employed at the main bearings I and IV. During grinding, the crankshaft 1 is continuously compared with respect to the desired and actual measurement. The corrections then made via the CNC control of the machine, the measuring devices continuously record the actual values ​​of the diameter of the main bearings I and IN. Once in one of the main bearings of the crankshaft 1, the target level is reached in the grinding, the grinding cycle is then stopped and moved clear of the grinding spindle 12th

In the Figure 3, although the grinding of the main bearings of the crankshaft is shown at 1, but it is also possible that more central portions of the crank shaft 1 can be ground with a correspondingly modified grinding wheel set in the same setting.

Figure 4 shows a simplified side view of the in Figure 3 shown

Plan view in the region of the working space of the main bearing II. It can be seen that then the ZusatescMeifeinrichtung 11 is swung out with the grinding wheel 10 upwards, but it is also conceivable that they are switched on or after the ScMeifmaschine and the available space construction in any other desired position can be swung or moved can ,

5 shows in detail the process of grinding with the grinding wheel 13 on the main bearings of the crankshaft 1, wherein the base body of the grinding wheel 13A and the CBN coating is designated by the 14th The cover height is approximately 5 mm in general. On depicted main bearings of the crankshaft 1 are also the lateral radii 15, as seen also ground. At the radius transition in terms of plane surfaces while a flat shoulder height of about 4 to 5 mm, for example, also ground.

In the figure 6 is shown as a simplified representation of how is ground with the grinding wheel 13 on the main bearing. The main bearing has an increase 16 which was applied by pre-processing, such as fluidized milling or turning on a separate device. It can clearly be seen that the grinding wheel 13 is only in the increase 16 in this main bearing in sliding engagement, however, the lateral zones 17 and the other main bearings of the crankshaft 1 in the grinding of the steady are not ground. After the steady rest is ground at the level of increase 16 Lunette is hired.

Subsequently, the grinding wheel set is further delivered, so that the crankshaft 1 can be ground to the finished final dimensions.

LIST OF REFERENCE NUMBERS

1 crankshaft

2 main bearings I, II, III, IV

3 Lunette

4, 5 Meters

6 chuck

7 longitudinal stop

8, 9 centering

10 grinding wheel

11 processing unit, additional grinding device

12 grinding spindle

13 grinding wheels

14 central axis

15 Side radii

16 increase

17 Lateral zones

Claims

claims
1. Apparatus for grinding of center bearings of crankshafts, having a clamping unit for clamping and for driving the crankshaft - in its axis of rotation, a grinding spindle unit with a grinding spindle, whose axis of rotation is parallel to the axis of rotation of the crankshaft and thee vertical deliverable to said crankshaft wherein said grinding spindle carries a number of corresponding to abrasive center bearings number of grinding wheels, and at least one of the grinding spindle opposite bezels for mounting the crankshaft in the region of at least a central bearing point is employed, wherein an additional handling unit (11) for preliminary work at least a centric
Bearing point (2) is provided to the crankshaft (1) for forming a relative to the bearing point elevated bearing seat for the steady rests (3) and wherein the bezel (3) is formed so that it always during the grinding of the bearings for counter bearing until the finished dimensions can be tracked.
2. Device according to claim 1, wherein the processing unit (11) is a grinding unit with at least one grinding wheel (10).
3. Device according to claim 2, wherein the grinding wheel (10) has a width which is less than the width of the central bearing (2).
4. Apparatus according to claim 2, wherein the processing unit (11) is pivoted zufuhrbar to their engagement with the crankshaft (1) between the crankshaft (1) and of the grinding spindle (12) when not engaged position of the grinding spindle (12) or to this.
5. Device according to claim 4, wherein the drive of the processing unit (11) is formed separately.
6. Device according to one of claims 1 to 5, wherein the bezel (3) automatically to the corresponding central bearing of the crankshaft (1) can be engaged.
7. Device according to claims 1 to 6, wherein the grinding wheels (10, 13) are CBN grinding wheels.
8. A method for the grinding of center bearings waves of crankshafts, are ground in which the central bearing points simultaneously by means of a grinding wheel set (multilayer grinding), wherein before the finish grinding of the center bearings (2) to their final dimensions at least at one bearing point is a bearing set different with the gauge block measure of
Bezel (3) is ground and the bezel (3) is up to the final dimension of the bearing seat tracked during the grinding of the bearing seats on the final dimensions.
9. The method of claim 8, wherein the bearing seat is ground with a first grinding wheel (10) and then the after pitching
Lunette (3) the center bearings (2) of the crankshaft (1) with the grinding wheel set are finish-ground.
10. The method of claim 8, wherein the bearing seat with a grinding wheel (13) of the grinding wheel set to an elevated contour (16) of the main bearing is ground, and then after pitching of the bezel (3) the center bearings of said crankshaft (1) with the grinding wheel set are finish-ground.
EP20020777056 2001-09-11 2002-09-10 Method and device for grinding central bearing positions on crankshafts Expired - Fee Related EP1427568B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2001144644 DE10144644B4 (en) 2001-09-11 2001-09-11 Method and device for grinding centric bearing points of crankshafts
DE10144644 2001-09-11
PCT/EP2002/010135 WO2003022521A1 (en) 2001-09-11 2002-09-10 Method and device for grinding central bearing positions on crankshafts

Publications (2)

Publication Number Publication Date
EP1427568A1 true EP1427568A1 (en) 2004-06-16
EP1427568B1 EP1427568B1 (en) 2005-01-19

Family

ID=7698575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020777056 Expired - Fee Related EP1427568B1 (en) 2001-09-11 2002-09-10 Method and device for grinding central bearing positions on crankshafts

Country Status (10)

Country Link
US (1) US6913522B2 (en)
EP (1) EP1427568B1 (en)
JP (1) JP4047277B2 (en)
KR (1) KR100820985B1 (en)
CN (1) CN100343017C (en)
CZ (1) CZ304903B6 (en)
DE (1) DE10144644B4 (en)
ES (1) ES2235096T3 (en)
RU (1) RU2303510C2 (en)
WO (1) WO2003022521A1 (en)

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Also Published As

Publication number Publication date
ES2235096T3 (en) 2005-07-01
JP4047277B2 (en) 2008-02-13
JP2005501754A (en) 2005-01-20
RU2303510C2 (en) 2007-07-27
CN100343017C (en) 2007-10-17
CZ2004346A3 (en) 2004-08-18
CN1541150A (en) 2004-10-27
CZ304903B6 (en) 2015-01-14
US20040248502A1 (en) 2004-12-09
EP1427568B1 (en) 2005-01-19
RU2004110944A (en) 2005-06-10
US6913522B2 (en) 2005-07-05
DE10144644B4 (en) 2006-07-13
WO2003022521A1 (en) 2003-03-20
DE10144644A1 (en) 2003-04-10
KR100820985B1 (en) 2008-04-10
KR20040030974A (en) 2004-04-09

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