GB2103129A - Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground - Google Patents
Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground Download PDFInfo
- Publication number
- GB2103129A GB2103129A GB08217320A GB8217320A GB2103129A GB 2103129 A GB2103129 A GB 2103129A GB 08217320 A GB08217320 A GB 08217320A GB 8217320 A GB8217320 A GB 8217320A GB 2103129 A GB2103129 A GB 2103129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spindle
- slide
- axis
- sensing arm
- measuring head
- 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
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/002—Grinding heads
-
- 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
- B24B49/02—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
- B24B49/04—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 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The headstock 16 of the machine carries a sleeve 15 in which a planet spindle 1 is mounted for rotation about its axis C. At its upper end the spindle 1 has a slip-ring element 2 and carries at its lower end a slide 3 which is displaceable radially of the axis C. A grinding tool spindle 4 with a grinding element 5 is mounted at one end of the slide 3. At the other end the slide 3 carries a measuring head 8 which is displaceable radially of the axis C and is constructed as an inductive measured value transmitter. The head 8 is connected to the slip- ring element via a lead 11 and has a sensing arm 9 which, in use, contacts the surface which is being machined, for example a bore of the workpiece 6. The sensing arm 9 is located in a plane formed by the tool spindle axis D and the planet spindle axis C. Separate but parallel acting displacing means are provided to co-operate with the slide 3 for respectively moving the slide radially of the planet spindle 1 and for displacing the measuring head 8 with the arm 9 along the slide 3. The direction of movement of the measuring head with the sensing arm 9 is opposite to that of the slide 3 with the tool spindle 4 and the magnitude of the sensing arm displacement being twice as great as that of the tool spindle 4. <IMAGE>
Description
SPECIFICATION
Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground
This invention relates to a measuring apparatus in a coordinate grinding machine for determining the position of surfaces of workpieces, for example bores.
The invention is useful in machine tool engineering in general and particularly as an advantageous accessory in coordinate grinding machines.
Measuring apparatuses are known for coordinate machines in great variety of types and forms. The range extends from distinct measuring machines to measuring heads which can be arranged on metal-working machines.
German Auslegeschrift 14 77 91 5 discloses an internal grinding machine in which a pneumatic measuring device is provided, of which the measuring head, partly surrounding the spindle, is arranged between the grinding wheel and its holder. This measuring head can participate in the axial sliding movement of the grinding spindle and is adjustable towards the workpiece centrically to the centre of the chuck by means of a cam during the axial sliding of the grinding wheel.
However, these apparatuses have the following substantial disadvantages: They do not permit measurement to be carried out continuously during the material removal process or at specific times in the machining process, in the case of coordinate grinding. This is because in coordinate grinding machines the workpieces machined are stationary, whereas the workpieces machined on internal grinding machines are rotating. Thus, no measuring apparatus can be used which is stationary in relation to the centre of the bore.
Consequently no direct evaluation of the measurement result for the material removal process is possible. It is neither possible to determine and evaluate the actual material removal progress, nor to effect automatic machining up to the finished size.
It is an object of the invention to arrange a measuring apparatus for determining the position of surfaces of workpieces, particularly of bores, in such a manner that economic use, i.e. an automatically operating coordinate grinding machine is possible.
The deficiencies described in the characteristics of the prior art, referred to the present invention, can be attributed to the following causes.
On coordinate grinding machines there is no place in the bores to be ground which is not swept by the grinding element. The fitting of stationary measuring heads is therefore impossible.
To overcome this, it is the underlying aim of the invention to provide in coordinate grinding machines a measuring apparatus for determining the position of surfaces of workpieces, particularly of bores, in which a sensor is movable both axially and radially and is arranged on a slide with the grinding tool, which despite the presence of the tool in the work space permits a sensing of the surface of the workpiece to be machined and a transmission of signals to appropriate measuring control systems.
The particular construction of a coordinate grinding machine (more particularly referred to hereinbelow), basically differentiates a coordinate grinding machine from a circular internal or external grinding machine. The result is the particular difficulty of determining a diameter variation by means of suitable measuring devices which may be constituted by pneumatic as well as inductive measured value transmitters. However, the measured value transmitter as such is not important here but rather its arrangement in the machine and particularly in the planet head.
Accordingly, the present invention provides in a coordinate grinding machine having a planet spindle rotatable about its axis and a slide mounted on said spindle for movement radially of said axis and carrying at one end a grinding tool spindle, a measuring apparatus for determining the position of a stationary workpiece surface which is being ground, for example a bore, said apparatus comprising a measuring head displaceably mounted at the other end of said slide and having a sensing arm engageable with said workpiece surface, the sensing arm being located in a plane formed by the grinding tool spindle axis and the planet spindle axis, separate but parallel-acting displacing means being provided to co-operate with said slide for respectively moving said slide radially of the planet spindle and for displacing the measuring head with the sensing arm, the direction of movement of the measuring head with the sensing arm being opposite to that of the slide with the tool spindle and the magnitude of the sensing arm displacement being twice as great as that of the tool spindle, whereby a measurement of the workpiece surface is ensured simultaneously with the machining of the workpiece. The measuring apparatus is so arranged that the measuring head is adjustable to the finished size, e.g. with a ring gauge, in the position in which the grinding tool spindle is zeroed.
The slide for the radial adjustment of the grinding element is also simultaneously the bracket for the measuring head. The measuring apparatus is advantageously so constituted that the finished size of a bore is obtained when the distance between the planet spindle axis and the surface of contact of the measuring lever with the workpiece is equal to half the desired diameter.
The measuring apparatus is also constituted so that the line of engagement of the grinding element to the point of contact of the sensing arm with the wall of the bore is arranged substantially symmetrically to the axis of rotation, i.e. to the planet spindle axis and therefore diametrically.
By combination of the tool and of the measuring head on one and the same support, axially symmetrical machining surfaces can be measured continuously over the total circumference, and circularity errors, centring errors and positional errors can therefore also be measured.
The connection of the measuring head to the actual measuring control system is effected by means of suitable transmission elements, such as slip-rings, etc., from the rotating planet spindle to the stationary part of the coordinate grinding machine.
In order that the invention may be more readily understood, reference is made to the accompanying drawing which illustrates diagrammatically and by way of example an embodiment of the invention in elevation. The drawing shows the headstock assembly of a coordinate grinding machine with a measuring apparatus for determining the position of surfaces of a workpiece being machined.
In coordinate grinding machines the displacement or movement axes C; D; U and Z are
mutually interlinked. Thus, axis C or planet spindle
axis is mounted in the Z-axis or sleeve axis.
The carrier (slide) of the U-axis, i.e. feed or
radial displacement axis is the axis C, and the
carrier of the axis D or grinding spindle axis is the
U-axis. Axes X and Y (not shown) serve for the
displacement of the workpiece table (not shown)
and thus for the positioning of the workpiece in
relation to the C-axis.
A sleeve 1 5 of the headstock 1 6 of a
coordinate grinding machine accommodates a
planet head 1, which has a slip-ring element 2 in
its upper part. A slide 3 is arranged adjustably in
an appropriate guideway of the planet head 1, and
carries at one end a grinding spindle 4 with a
grinding element 5 which is in contact by its line
of engagement 7 with the wall of a bore in a
workpiece 6. In a guide at the other end of the
slide 3 an inductive measuring head 8 with a
sensing arm 9 is arranged radially adjustably by
means of an intermediate slide 17, the point of
contact 10 of said arm with the wall of the bore
being located diametrally opposite to the line of
engagement 7. The connection of the measuring
head 8 to the slip-ring element 2 is made by
means of leads 11.
The mode of operation of the arrangement is as
follows: When setting up, the grinding element 5
is first of all adjusted to the workpiece 6. This
adjustment is made so that it is certain that the
grinding element 5 is not in engagement with the
workpiece, even for the oversize fluctuations to be
expected. The U-axis is zeroed in this position. In
this position of the U-axis, the measuring head 8 is
also adjusted to the finished size of the bore, e.g.
with a ring gauge.
Both positions, U-axis and sensing arm 9,
embody the finished size. The direction of
movement of the sensing arm 9 is made opposite
to that of the U-axis.
If the U-axis is adjusted during the following
work cycle, then the two position changes must
be added for the finished size determinations.
After setting up, the in-feed of the grinding element 5 towards the workpiece 6 occurs in automatic work cycle. This occurs in rapid motion until the grinding element 5 comes into engagement with the wall of the bore. It should be noted here that due to the deflection of the grinding spindle 4 a difference arises between the
U-adjustment and the measuring lever adjustment. This difference is equal to the deflection of the grinding spindle 4.
The actual grinding process now commences and is characterised by the fact that a value of the
U-adjustment results in twice as great a value of the measuring lever adjustment. The in-feed occurs with a constant comparison of the position changes of the U-axis and of the sensing arm 9, so that the deflection of the grinding spindle 4 is maintained constant. The value of the deflection is then reduced on changing from roughing to smoothing. The in-feed then continues during smoothing until the positions embodying the finished size, which were determined whilst setting up, are reached, i.e. the sum of the position changes of the U-axis and of the sensing arm 9 equals zero.
It is essential in this context that the wear of the grinding element which occurs during the grinding process has no influence upon the result of the work.
Where an appropriate measuring control system is used, it is also possible with this apparatus to detect the blunting of a grinding element by the deceleration of the work progress.
Claims (5)
1. In a coordinate grinding machine having a planet spindle rotatable about its axis and a slide mounted on said spindle for movement radially of said axis and carrying at one end a grinding tool spindle, a measuring apparatus for determining the position of stationary workpiece surface which is being ground, for example a bore, said apparatus comprising a measuring head displaceably mounted at the other end of said slide and having a sensing arm engageable with said workpiece surface, the sensing arm being located in plane formed by the grinding tool spindle axis and the planet spindle axis, separate but parallelacting displacing means being provided to cooperate with said slide for respectively moving said slide radially of the planet spindle and for displacing the measuring head with the sensing arm, the direction of movement of the measuring head with the sensing arm being opposite to that of the slide with the tool spindle and the magnitude of the sensing arm displacement being twice as great as that of the tool spindle, whereby a measurement of the workpiece surface is ensured simultaneously with the machining of the workpiece.
2. In a coordinate grinding machine an apparatus as claimed in claim 1, wherein the measuring head is constituted by an inductive measured value transmitter, and the line of engagement of the grinding tool in relation to the point of contact of the sensing arm with the ground surface of the stationary workpiece is, in use, located substantially symmetrically to the planet spindle axis, that is to say diametrally opposite.
3. In a coordinate grinding machine, an apparatus as claimed in claim 1 or 2, wherein the measuring head is adjusted to the finished size of the workpiece in the position in which the grinding tool spindle is zeroed.
4. In a coordinate grinding machine, an apparatus as claimed in claim 3, wherein the finished size of a bore is reached when the distance between the planet spindle axis and the point of contact of the sensing arm on the workpiece is equal to half the nominal value of the diameter of the bore.
5. In a coordinate grinding machine, a measuring apparatus for determining the position of a stationary workpiece surface which is being ground, substantially as herein described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08217320A GB2103129B (en) | 1981-06-15 | 1982-06-15 | Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8118353 | 1981-06-15 | ||
| GB08217320A GB2103129B (en) | 1981-06-15 | 1982-06-15 | Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2103129A true GB2103129A (en) | 1983-02-16 |
| GB2103129B GB2103129B (en) | 1984-12-12 |
Family
ID=26279802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08217320A Expired GB2103129B (en) | 1981-06-15 | 1982-06-15 | Arrangement in a coordinate grinding machine of a measuring apparatus for determining the position of a workpiece surface which is being ground |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2103129B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0273055A1 (en) * | 1986-04-05 | 1988-07-06 | Nagase Iron Works Co., Ltd. | Machine and method of grinding molding die |
| EP2125273A1 (en) * | 2007-02-01 | 2009-12-02 | Self Leveling Machine Inc. | Boring machine for turbine casings |
| CN101407033B (en) * | 2007-10-10 | 2012-10-03 | 昭和电工株式会社 | Device for grinding and processing die hole |
| JP2017501895A (en) * | 2013-12-19 | 2017-01-19 | エルヴィン ユンカー グラインディング テクノロジー アクツィオヴァ・スポレチュノストＥｒｗｉｎ Ｊｕｎｋｅｒ Ｇｒｉｎｄｉｎｇ Ｔｅｃｈｎｏｌｏｇｙ ａ．ｓ． | Method and machine for measuring and forming the outer target contour of a workpiece by grinding |
| CN106392739A (en) * | 2016-11-30 | 2017-02-15 | 无锡润和机电技术有限公司 | Rotation machining device for special-shaped workpiece |
| CN108058071A (en) * | 2017-12-17 | 2018-05-22 | 泰州市伟业机械制造有限公司 | A kind of end face of ring gear processing grinding out mechanism |
| CN108655881A (en) * | 2018-05-15 | 2018-10-16 | 芜湖杰诺科技有限公司 | A kind of valve elastic clamping end face circle grinding device |
-
1982
- 1982-06-15 GB GB08217320A patent/GB2103129B/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0273055A1 (en) * | 1986-04-05 | 1988-07-06 | Nagase Iron Works Co., Ltd. | Machine and method of grinding molding die |
| EP0273055A4 (en) * | 1986-04-05 | 1989-02-23 | Nagase Iron Works Co Ltd | Machine and method of grinding molding die. |
| US4936052A (en) * | 1986-04-05 | 1990-06-26 | Nagase Iron Works Co., Ltd. | Machine and method of grinding molding die |
| EP2125273A1 (en) * | 2007-02-01 | 2009-12-02 | Self Leveling Machine Inc. | Boring machine for turbine casings |
| EP2125273A4 (en) * | 2007-02-01 | 2012-02-29 | Self Leveling Machine Inc | Boring machine for turbine casings |
| US8276488B2 (en) | 2007-02-01 | 2012-10-02 | Self Leveling Machines, Inc. | Boring machine for turbine casings |
| CN101407033B (en) * | 2007-10-10 | 2012-10-03 | 昭和电工株式会社 | Device for grinding and processing die hole |
| JP2017501895A (en) * | 2013-12-19 | 2017-01-19 | エルヴィン ユンカー グラインディング テクノロジー アクツィオヴァ・スポレチュノストＥｒｗｉｎ Ｊｕｎｋｅｒ Ｇｒｉｎｄｉｎｇ Ｔｅｃｈｎｏｌｏｇｙ ａ．ｓ． | Method and machine for measuring and forming the outer target contour of a workpiece by grinding |
| CN106392739A (en) * | 2016-11-30 | 2017-02-15 | 无锡润和机电技术有限公司 | Rotation machining device for special-shaped workpiece |
| CN108058071A (en) * | 2017-12-17 | 2018-05-22 | 泰州市伟业机械制造有限公司 | A kind of end face of ring gear processing grinding out mechanism |
| CN108655881A (en) * | 2018-05-15 | 2018-10-16 | 芜湖杰诺科技有限公司 | A kind of valve elastic clamping end face circle grinding device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2103129B (en) | 1984-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |