EP4161730A1 - Schleifvorrichtung für wälzkörper und verfahren zur ermittlung des füllgrads einer schleifvorrichtung - Google Patents
Schleifvorrichtung für wälzkörper und verfahren zur ermittlung des füllgrads einer schleifvorrichtungInfo
- Publication number
- EP4161730A1 EP4161730A1 EP21716963.0A EP21716963A EP4161730A1 EP 4161730 A1 EP4161730 A1 EP 4161730A1 EP 21716963 A EP21716963 A EP 21716963A EP 4161730 A1 EP4161730 A1 EP 4161730A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling elements
- grinding
- grinding wheel
- rolling
- filling
- 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
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
- B24D13/04—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising a plurality of flaps or strips arranged around the axis
- B24D13/045—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising a plurality of flaps or strips arranged around the axis comprising flaps not covering the entire periphery of the wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
- B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
- B24B11/04—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels
- B24B11/06—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels acting by the front faces, e.g. of plane, grooved or bevelled shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/003—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving acoustic means
Definitions
- the invention relates to a device designed for grinding rolling elements, in particular balls, according to the preamble of claim 1. Furthermore, the invention relates to a method for determining the degree of filling of a grinding device.
- a generic grinding device provided for grinding balls is known from DE 7410301 U, for example.
- the known grinding device has two horizontally arranged rotatable disks, between which a grinding medium and the bodies to be ground, that is to say rolling bodies, are to be added.
- One of the two disks of the known grinding device consists of a hard material, whereas the other disk is provided with a layer made of a rubber-elastic material.
- the first disk, made of a hard material, for example oxide ceramic has guide grooves for guiding the bodies to be ground, which can describe a spiral shape.
- the axes of rotation of the two disks can either coincide or be offset from one another.
- the Vorrich device according to DE 7410301 U in particular, the grinding of balls made of hard metal or oxide ceramics should be possible.
- the invention is based on the object of further developing the grinding of rolling elements compared to the cited prior art, with a particularly high level of process reliability with only extremely small fluctuations in product parameters under the conditions of series production.
- this object is achieved by a grinding device having the features of claim 1.
- the object is also achieved by a method for determining the degree of filling of a grinding device according to claim 7.
- the embodiments and advantages of the invention explained below in connection with the method of determining the degree of filling also apply mutatis mutandis to the device designed for grinding rolling bodies and vice versa.
- the grinding device comprises at least one grinding wheel, which is designed to grind rolling elements, in particular balls, guided in at least one path of the grinding wheel.
- an evaluation system is assigned to the grinding device, which is designed for the individual acoustic detection of rolling elements guided through the web, that is, rolling bodies diverted from the grinding device, and thus for determining the degree of filling of the web.
- the degree of filling of the path, which the rolling elements pass through during grinding is also referred to as the degree of filling of the grinding device.
- the invention is based on the consideration that parameters of the workpieces, that is to say rolling elements, depend significantly on the degree of filling of the grinding device.
- the theoretical upper limit of the degree of filling is 100%, which would mean that the The grinding gap is completely filled with rolling elements.
- the filling level should be set to a defined value below 100%.
- Input variables of such considerations are geometric features of the grinding device and the workpieces to be grinded, with which movement states of the workpieces in the grinding device can be simulated.
- the degree of filling has a significant influence on the forces acting on the workpieces.
- VwD average dwell time of the rolling elements in the grinding wheel arrangement
- dt measured average time interval between two signals that each indicate the falling of a rolling element
- LR total length of the path available for the rolling elements to pass through the grinding wheel arrangement.
- the number of events which each represent the exit of a processed rolling element from the grinding device can be recorded over a fixed, sliding period of time.
- the number of events for example ten or 20 events, can be specified, with the period of time that has elapsed during these events being measured.
- the acoustic signals can be processed with filtering, in particular high-pass filtering. Low-pass filtering or band filtering can also be considered.
- a structure-borne noise sensor is particularly suitable for detecting the acoustic signals generated by the falling rolling elements. As far as structure-borne noise sensors are concerned, reference is made, for example, to the documents DE 102007 057 136 A1, DE 42 07 910 C2 and WO 2014/095763 A1.
- the grinding device can be operated with either a single rotating disk or with a plurality of rotating disks. All speeds can be included in the degree of filling determination.
- a collecting body which is designed in particular as a measuring plate, is mounted on vibration-damping elements, for example supports.
- the vibration-damping elements are designed in such a way that they have a particularly high level of damping at frequencies that are generated by the impacting rolling elements.
- a structure-borne sound sensor can be mounted directly on the Auffangkör, in particular under the measuring plate.
- the at least one grinding wheel of the grinding device is arranged horizontally in a typical Ausgestal device.
- a vertical arrangement of the grinding wheel or an inclined position of its axis of rotation can also be considered.
- the geometry of the at least one path or paths to be traversed by the rolling elements there are various design options with regard to the geometry of the at least one path or paths to be traversed by the rolling elements. For example, several lanes are nested concentrically one inside the other. Alternatively, a single path in which the rolling elements are ground can be designed in a spiral shape.
- a grinding device identified as a whole by the reference numeral 1 is designed as a horizontal grinding machine and is provided for machining rolling elements 2, namely balls for ball bearings.
- the grinding device 1 comprises a grinding wheel arrangement 5 made up of two grinding wheels 3, 4, which is also referred to as a grinding machine in the narrower sense.
- the grinding wheels 3, 4 have grooves 6, 7 in which the balls 2 are ground.
- a rolling element inlet of the grinding wheel arrangement 5 is denoted by 8, and a rolling element drain is denoted by 9.
- the common central axis of the grinding wheels 3, 4 is denoted by MA.
- FIG. 3 an angle a formed between the rolling element inlet 8, the central axis MA and the rolling element outlet 9 is shown.
- the rolling elements 2 fed through the rolling element inlet 8 typically cover a large number of revolutions before they leave the grinding wheel arrangement 5 on the rolling element outlet 9.
- a track 10 is formed by the grooves 6, 7, which is available for the passage of the rolling elements 2 in the grinding wheel arrangement 5 and has an overall length LR.
- the ratio of the length of this chain to the total length LR represents the degree of filling of the grinding wheel arrangement 5, referred to as FG, which is also referred to as the degree of filling FG of the grinding device 1 for short.
- a direct measurement of the degree of filling FG would in principle be possible by individually counting the rolling elements 2 fed in through the rolling element inlet 8 and the rolling elements 2 exiting from the rolling element outlet 9, with the times of entry and exit of the rolling elements also being recorded.
- the grinding wheel arrangement 5 has features in common with an axial ball bearing. Assuming a stationary grinding wheel 3, 4 and the rotation of the other grinding wheel 4, 3, each rolling element 2 rotates approximately at half the angular speed of the speed that the rotating grinding wheel 3, 4 has around the central axis MA.
- Deviations from this are due in particular to the fact that the rolling elements 2 do not only touch the grinding wheels 3, 4 at certain points, and can be detected through experiments and / or further theoretical considerations can be simulated.
- an average dwell time VwD is determined, which indicates how long each rolling element 2 is on average in the grinding wheel arrangement 5.
- rolling elements 2 are prescriptionnom men from an outlet belt 11. From the discharge belt 11, the rolling elements 2 fall individually onto a measuring plate 12, which represents a collecting body. A body sound sensor 13, which is assigned to an evaluation system 14, is located on the collecting body 12.
- the Auffangkör by 12 is, as can be seen from Figure 1, th with the help of vibration-damping Elemen 15 mounted.
- Various data D1, D2, D3 then enter the evaluation system 14. These are statistical data D1, dynamic data D2 and sensor data D3.
- the statistical data D1 include, in particular, the ball diameter DW and the total length LR of the path 10.
- the dynamic data D2 include the speed of the grinding wheel 3, 4. This also applies accordingly to a rotation of both grinding wheels 3, 4.
- the sensor data D3 obtained are the individual pulses that are generated by the impact of the rolling elements 2 on the measuring plate 12.
- the evaluation system 14 determines an average time interval dt between two signals, which are each generated by the falling of a rolling element 2 onto the measuring plate 12.
- the period over which the averaging of the average time interval dt takes place can be adjustable.
- the number of individual events, that is to say acoustic pulses, which are detected before an average value of the time interval dt is formed can be set.
- the average time interval dt is set in relation to the average dwell time VwD of the rolling elements 2 in the grinding wheel arrangement 5. If the average time interval dt is, for example, a tenth of the average dwell time VwD, this means that an average of ten rolling elements 2 are located in the grinding gap between the grinding wheels 3, 4 at the same time. Furthermore, a total length LR is given, which in this example corresponds to 50 times the rolling element diameter DW.
- the degree of filling FG of the grinding device 1 - more precisely: the grinding wheel arrangement 5 - is according to the formula
- speed of the grinding wheels 3, 4 or a ball magazine can be varied, for example.
- D2 dynamic data D3 sensor data dt average time interval DW rolling element diameter FG filling level
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020115019.9A DE102020115019A1 (de) | 2020-06-05 | 2020-06-05 | Schleifvorrichtung für Wälzkörper und Verfahren zur Ermittlung des Füllgrads einer Schleifvorrichtung |
| PCT/DE2021/100283 WO2021244693A1 (de) | 2020-06-05 | 2021-03-22 | Schleifvorrichtung für wälzkörper und verfahren zur ermittlung des füllgrads einer schleifvorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4161730A1 true EP4161730A1 (de) | 2023-04-12 |
| EP4161730B1 EP4161730B1 (de) | 2024-05-29 |
Family
ID=75426282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21716963.0A Active EP4161730B1 (de) | 2020-06-05 | 2021-03-22 | Schleifvorrichtung für wälzkörper und verfahren zur ermittlung des füllgrads einer schleifvorrichtung |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4161730B1 (de) |
| CN (1) | CN115515749B (de) |
| DE (1) | DE102020115019A1 (de) |
| HU (1) | HUE067309T2 (de) |
| PL (1) | PL4161730T3 (de) |
| WO (1) | WO2021244693A1 (de) |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7410301U (de) | 1974-06-20 | Heraeus W Gmbh | Schleifvorrichtung, insbesondere für Kugeln | |
| DE193953C (de) | 1905-10-11 | |||
| SU1191263A2 (ru) * | 1983-11-05 | 1985-11-15 | Белорусский Ордена Трудового Красного Знамени Политехнический Институт | Устройство дл обработки шариков |
| JP3148762B2 (ja) | 1991-06-18 | 2001-03-26 | 株式会社ツバキ・ナカシマ | 鋼球研磨装置 |
| JP3245900B2 (ja) | 1991-09-02 | 2002-01-15 | 日本精工株式会社 | ボールラップ盤及びその使用方法 |
| DE4207910C2 (de) | 1992-03-12 | 1994-06-01 | Siemens Ag | Resonanzvermindernde Ummantelung für einen Körperschallsensor |
| CN1072544C (zh) * | 1995-04-19 | 2001-10-10 | 贺伯特·皮克曼 | 研磨机 |
| WO1996033047A1 (de) | 1995-04-19 | 1996-10-24 | MESSERSCHMIDT, Jürgen | Läppmaschine |
| GB2335875B (en) | 1998-04-02 | 2000-08-30 | Nsk Ltd | Sphere grinding apparatus |
| CA2454748C (en) * | 2001-07-27 | 2011-10-25 | Endress + Hauser Gmbh + Co.Kg | Method for evaluating the measurement signals of a propagation-time based measurement device |
| DE102005004038A1 (de) | 2005-01-27 | 2006-08-03 | Guilleaume-Werk Gmbh | Verfahren und Vorrichtung zum Schleifen von keramischen Kugeln |
| DE102007057136A1 (de) | 2007-11-28 | 2009-06-04 | Robert Bosch Gmbh | Schaltung für einen mikromechanischen Körperschallsensor und Verfahren zum Betrieb eines mikromechanischen Körperschallsensors |
| DE102012211634A1 (de) | 2012-07-04 | 2014-01-09 | Bütfering Schleiftechnik GmbH | Berührungsloses Abtastsystem für Schleifmaschinen |
| DE102012223775A1 (de) | 2012-12-19 | 2014-06-26 | BSH Bosch und Siemens Hausgeräte GmbH | Haushaltsgerät mit einem Körperschallsensor, System und entsprechendes Verfahren |
| CN103411646B (zh) * | 2013-08-22 | 2016-01-20 | 北矿机电科技有限责任公司 | 立磨机内钢球填充率的检测方法及系统 |
| CN103438934B (zh) * | 2013-08-27 | 2015-11-18 | 昆明理工大学 | 一种球磨机负荷参数检测方法及装置 |
| JP5941236B1 (ja) * | 2016-02-12 | 2016-06-29 | 株式会社天辻鋼球製作所 | 高精度球体寸法測定装置および球体研磨装置 |
| CN109500692A (zh) * | 2019-01-14 | 2019-03-22 | 张万进 | 一种磨钢球机的自动加压装置 |
-
2020
- 2020-06-05 DE DE102020115019.9A patent/DE102020115019A1/de not_active Withdrawn
-
2021
- 2021-03-22 PL PL21716963.0T patent/PL4161730T3/pl unknown
- 2021-03-22 WO PCT/DE2021/100283 patent/WO2021244693A1/de not_active Ceased
- 2021-03-22 EP EP21716963.0A patent/EP4161730B1/de active Active
- 2021-03-22 HU HUE21716963A patent/HUE067309T2/hu unknown
- 2021-03-22 CN CN202180033635.XA patent/CN115515749B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115515749A (zh) | 2022-12-23 |
| WO2021244693A1 (de) | 2021-12-09 |
| HUE067309T2 (hu) | 2024-10-28 |
| PL4161730T3 (pl) | 2024-09-23 |
| EP4161730B1 (de) | 2024-05-29 |
| CN115515749B (zh) | 2025-11-07 |
| DE102020115019A1 (de) | 2021-12-09 |
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