CN1018251B - The magnetic head that magnetic head finishing method and buffing machine thereof and this method are produced - Google Patents
The magnetic head that magnetic head finishing method and buffing machine thereof and this method are producedInfo
- Publication number
- CN1018251B CN1018251B CN89108777A CN89108777A CN1018251B CN 1018251 B CN1018251 B CN 1018251B CN 89108777 A CN89108777 A CN 89108777A CN 89108777 A CN89108777 A CN 89108777A CN 1018251 B CN1018251 B CN 1018251B
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- China
- Prior art keywords
- sand belt
- magnetic head
- guide
- sand
- moulding
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- 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.)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/255—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for protection against wear
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- 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
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/16—Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Magnetic head (40,40a, 40b) is to polish with sand belt guide (11a, 11b) guiding and with the sand belt (1) that the internal circular surfaces of sand belt moulding guide block (20a, 20b) is pressed on the sand belt guide (11a, 11b), sand belt moulding guide block is arranged near sand belt (1) outside surface, to obtain to have the magnetic head of little contact with tape face shape error.This magnetic head finishing method is to realize by moving the buffing machine that on the side sand belt (1) is pressed on sand belt guide (11a, 11b) with sand belt moulding guide block at the tape of sand belt.
Description
The present invention relates to a kind of finishing method of contact with tape face of magnetic head finishing method, particularly magnetic head; Relate to the magnetic head buffing machine that is used for this polishing, particularly can accurately polish out the magnetic head buffing machine of the contact with tape face shape of magnetic head; With the magnetic head that is come out by this explained hereafter, particularly VCR(is video Cassette recorder equipped) magnetic head, its contact with tape face is precise polished, and the magnetic recording and the magnetic copying equipment that adopt this magnetic head.
Producing ramming head is need the contact with tape face of magnetic head be polished.In the common magnetic head buffing machine, magnetic head (work piece) is contained on the sand belt guide of rotor, with the speed rotation of regulation.Sand belt spirality ground is on the cylindrical of this guide.Direction towards regulation is rolled.Magnetic head is assembled into and slightly exceeds guide, with the surface of contact that polishes the tape.As a result, the contact with tape face is to be contained in contact with tape shape polishing identical among the actual VCR according to magnetic head.
Japanese patent application 55-101130 in the trial and publication number are the argumentation that the Japanese patent application of 58-13972 has this respect.
But above-mentioned prior art does not have to consider that the magnetic head of loading onto stretches out this situation from rotating cylinder, does not consider to adjust tangible sand belt toughness yet.Because the center of curvature of magnetic head sheet thickness direction and the change gap center of magnetic head there are differences, that is to say, exist big off-centre, it is the big skew of magnetic tape drive directional curvature radius or magnetic head along the radius-of-curvature of thickness direction, magnetic head and contact with tape are bad, make the output characteristics can not be satisfactory.For this reason, magnetic head often will polish again, causes a large amount of wastes of time.
Suppose that magnetic head overhang (being designated hereinafter simply as overhang, referring to Fig. 8) from the sand belt guide is △ t, the magnetic head radius of magnetic tape drive direction (being designated hereinafter simply as the driving direction radius, referring to Figure 15) is R
X, be R perpendicular to the magnetic head radius of magnetic tape drive direction (be designated hereinafter simply as the right angle orientation radius, referring to Fig. 9 a, 15 and 16)
Y, then have relation as shown in figure 10 between these parameters.Sand belt tension force is 1.96N in this case.According to this figure, along with the increase of overhang △ t, driving direction radius " R
X" and right angle orientation radius " R
r" be tending towards reducing, therefore be necessary accurately to adjust overhang △ t, to improve the form accuracy of driving direction radius and right angle orientation radius.R
XAnd R
YRepresent generally by magnetic head radius " R ".
Fig. 8 is the typical cross-section with the major part of the situation of common magnetic head buffing machine polishing magnetic-head, and Fig. 9 a-9c is the synoptic diagram of the magnetic head example that polishes out with the sort of buffing machine.In Fig. 8, sequence number 41 is represented guide, and magnetic head 40 is contained on this guide together with the magnetic head sheet 40a that is fixed on the magnetic head body 40b, slightly stretches out from this guide cylindrical simultaneously.The surface of contact " S " of 1 pair of magnetic head 40 of sand belt polishes.
But because the variation of the contact force of 1 of contact force, sand belt tension force and the magnetic head sheet 40a of 41 of sand belt 1 and guides and sand belt, sand belt 1 can move up and down in vertical direction, causes the site error at the relative sand belt of magnetic head sheet 40a 1 width W center.
Therefore, if magnetic head sheet 40a is positioned at the top at sand belt 1 center, magnetic head sheet 40a can become protruding like that at the upside of Width shown in Fig. 9 b; On the contrary, if magnetic head 40a is positioned at sand belt 1 central lower, magnetic head sheet 40a can become protruding like that at the downside of Width shown in Fig. 9 c, and the protruding situation of above-mentioned change all can produce the inclination on the Width.
Therefore, desired resemble shown in Fig. 9 a contact with tape face shape, promptly it should be positioned at magnetic head sheet thickness (h/2) center in the center of curvature perpendicular to tape motion direction (magnetic head sheet thickness " h " direction), and has the radius of curvature R of regulation
0, can not obtain, the shape and size error of product is sizable.
As mentioned above, the adjustment problem of magnetic head overhang from this guide when above-mentioned prior art does not consider that magnetic head is contained on the sand belt guide, consider to adjust the toughness that sand belt shows and the variation of sand belt position, the contact with tape face of the magnetic head that is polished does not just reach desired shape yet and reduces the requirement of finishing room error as far as possible.Thereby meeting loose contact between magnetic head and tape, the result requires polishing again, has significantly reduced generation rate.
The objective of the invention is to remove above-mentioned the deficiencies in the prior art, and a kind of finishing method of magnetic head is provided, the contact with tape mirror polish of magnetic head can be arrived desired shape, and less error.Another object of the present invention provides a kind of magnetic head buffing machine that is used for said method.A further object of the present invention provides a kind of high precision magnetic head that comes out with said method and production of machinery.
With regard to the finishing method of magnetic head, for realizing purpose of the present invention, be in polishing process, the contact with tape face of magnetic head is remained in the gap with specified length that forms between two axial relative sand belt guides, and stretch out the distance of regulation from this sand belt guide cylindrical, driving is by the sand belt of sand belt guide guiding, with the contact with tape face that is pressed in the sand belt moulding guide block polishing magnetic-head on the sand belt that contacts with sand belt guide cylindrical.The surface that sand belt is pressed in the above-mentioned sand belt moulding guide block on the described sand belt guide is to have the almost cylindrical form interior surface of same curvature with described sand belt guide cylindrical, does not comprise that with the sand belt Width the corresponding surface of two parts up and down of magnetic head covered portion (being the side, two ends of sand belt) also has curvature much at one.The processing effect of good child-rearing is guaranteed in the polishing of following the swing of sand belt moulding guide block to carry out.Another kind of feasible way is to use the aerodynamic force by the ejection of the groove on the sand belt seal face that is arranged on above-mentioned sand belt moulding guide block that sand belt is pressed on the sand belt guide cylindrical.
For making the swing of sand belt moulding guide block, have two kinds of methods available: a kind of is to rotate swing method, and its oscillation centre line is positioned at the central plane of magnetic head sheet thickness direction; Another kind is the straight line swing method, towards the center line reciprocally swinging of sand belt guide.
The magnetic head buffing machine of the present invention that is used for the said head finishing method comprises: sand belt guide parts, it has a pair of sand belt guide, they have identical external diameter, are bearing on the same axis in mode free to rotate, and the gap between sand belt guide on two can be adjusted to the numerical value of regulation; Piece-holder tube or magnetic head clamping tube or workpiece supporter (being designated hereinafter simply as the piece-holder tube), it is bearing on the same axis of a sand belt guide in the sand belt guide parts, can rotate relative to this sand belt guide; The cylindrical shell driver part, it can drive this piece-holder tube time interval in accordance with regulations and alternately rotate and reverse; With the sand belt conveyer, it can drive sand belt along the cylindrical of two sand belt guides of sand belt guide parts.In addition, in magnetic head buffing machine of the present invention, above-mentioned piece-holder tube can be in the gap of piece-holder between two sand belt guides of needs processing, and its top is stretched out from the cylindrical of sand belt guide.In addition, in the magnetic head buffing machine of the present invention, also be provided with sand belt moulding leader block parts, it has a pair of sand belt moulding guide block, its sand belt seal face is to form along sand belt guide cylindrical, and the cornerite (angle among Fig. 3 " α ") of a regulation arranged, they are just in the face of each cylindricals of two sand belt guides like this, and compress sand belt from the axis direction of two side direction sand belt guides of Width.
In other words, for achieving the above object, magnetic head buffing machine of the present invention is so a kind of machine, its sand belt is to be led by a pair of cylindrical with sand belt guide of specified gap respect to one another, magnetic head contact with tape face from the overhanging predetermined distance of this sand belt guide when with above-mentioned sand belt supporting being got up polishes, it is characterized in that it is provided with the sand belt moulding leader block parts of sand belt being pressed to sand belt guide cylindrical, sand belt moulding guide block forces the sand belt moulding like this.
For preventing the wearing and tearing of sand belt guide, be provided with friction pulley, it can make this sand belt guide with the speed rotation synchronous with the sand belt feeding.
The material of this sand belt moulding guide block can adopt the resin of low-friction coefficient; Perhaps this sand belt moulding guide block can be made like this, promptly by the air of the ejection of the groove from its sand belt seal face, sand belt can be pressed on the sand belt guide cylindrical.
In addition, make the device of this sand belt moulding guide block with the rotating manner swing, its center of rotation can make polishing effect better by in the plane at magnetic head thickness direction center.
As for the magnetic head of the present invention that goes out with said method of the present invention and production of machinery, its contact with tape face shape has extraordinary symmetry and (that is to say the relative right angle orientation radius of the flexure plane of above-mentioned xsect " R on the xsect perpendicular to the contact with tape direction
Y" be symmetrical).Suppose that above-mentioned xsect in magnetic head contact with tape direction transmits center, gap 0.2mm scope, just can obtain the quite magnetic head of symmetry, promptly 0.1 μ m is only being arranged from difference in height perpendicular to both sides, contact with tape direction center (a among Figure 16 and b) 0.05mm place.
The overall height of this sand belt moulding guide block (Wg among Fig. 5) scope is 2.5 to 35mm.The independent altitude range of a pair of sand belt moulding guide block is 1 to 10mm.The mutual interstice coverage of a pair of sand belt moulding guide block is 0.5 to 15mm.If each sand belt moulding guide block height is less than 1mm, it is so good that effect of the present invention just can not be look to; If but exceed 10mm, and effect of the present invention has also arrived the limit, and can not promise oneself has increased the advantage of height.If the gap between two independent sand belt moulding guide blocks is less than 0.5mm, the distortion of sand belt is just excessive; If but surpass 15mm, and it acts on and does not use the prior art of sand belt moulding guide block close, and effect of the present invention is just not obvious.The situation of above-mentioned two aspects is all unfavorable.The height of a pair of upper and lower sand belt moulding guide block and above-mentioned gap sum just draw the overall height of sand belt moulding leader block parts.
Although the radius-of-curvature of the inside surface of above-mentioned sand belt moulding leader block parts can be approximately equal to the radius-of-curvature of sand belt guide, in general can be greater than sand belt guide outer surface curvature radius 0～1mm.But, be what to use with the radius-of-curvature face of cylinder guiding much at one of sand belt guide outside surface as long as drive sand belt, then there is no need the radius-of-curvature of the inside surface of sand belt moulding guide block is limited in the above-mentioned scope.
Whether the upper end of sand belt Width overlaps with the upper end of sand belt moulding guide block, with and whether be inessential in the lower end if overlapping with sand belt moulding guide block.
When working, sand belt moulding guide block assembling back should not rock, and adjust to such degree, sand belt is contained between sand belt guide outside surface and the sand belt moulding guide block inside surface, and sand belt is formed and the sand belt guide outer surface curvature radius face of cylinder much at one.In this case, the assembling of sand belt moulding guide block should make the pressure of its generation allow sand belt to be easy to laterally move.This can realize by test easily.
Sand belt moulding guide block can use any material, as iron, and non-ferrous metal, plastics etc. are as long as its intensity is enough.Adopt the resin elimination sand belt of low-friction coefficient and the friction between sand belt moulding guide block, can reduce the fracture of sand belt, thereby make polishing stable.Use under the situation of resin of low-friction coefficient, only use resin and other parts are made by iron or non-ferrous metal, still can obtain same effect at the sand belt seal face of sand belt moulding guide block.In order to reduce above-mentioned broken belt, wish that very the groove ejection from the sand belt seal face that is arranged on sand belt moulding guide block compresses the air of sand belt.
Magnetic head should be 50 to 400 μ m from the overhang of sand belt guide cylindrical, and the contact angle of sand belt and sand belt guide should be 60 to 180 degree.Above-mentioned contact angle supposes that corresponding to " α " angle among Fig. 3 the gap between a pair of sand belt moulding guide block is divided into Wb of two parts up and down and the Wa of counting from magnetic head sheet center, and as shown in Figure 5, Wb and Wa two parts can constitute by 0.25 to 7.5mm.
Sand belt and magnetic head (work piece) contact with tape face do not have site error in the magnetic head buffing machine of the present invention, so its center of curvature is positioned at magnetic head sheet mid-depth (promptly eccentric=0), thereby guarantee that the contact with tape face is consistent with the radius-of-curvature of requirement.In addition, the toughness that sand belt shows also is improved, and therefore adjusts the snap-in force of sand belt and the gap between adjustment sand belt moulding guide block and just can make above-mentioned radius-of-curvature controlled easily.That is to say, reduce the sand belt snap-in force, and the gap between increase sand belt moulding guide block can make the magnetic head radius " R of magnetic head contact with tape face
X" and " R
Y" increase.By increasing the overhang △ t of sand belt tension force and/or magnetic head, can strengthen the sand belt snap-in force.
Owing to be provided with above-mentioned friction pulley, sand belt will never polish sand belt guide cylindrical, so system's long-term work can not change the overhang that the magnetic head sheet stretches out the sand belt guide yet, thereby has guaranteed this buffing machine serviceable life over a long time.
The present invention by contact with regard to the overhang of energy measurement magnetic head, and magnetic head is to install in the mode that its overhang that stretches out the sand belt guide is a definite value, like this lateral radius " R
X" and right angle orientation radius " R
Y" all be adjustable to setting.Since can the magnetic head tip position to process while measuring, the form accuracy of magnetic head also can improve.
By sand belt moulding guide block 20a and 20b shown in Figure 5 are set, and the gap " Wa " between sand belt moulding guide block 20a/20b and " Wb " and magnetic head sheet 40a center are adjusted to assigned position, sand belt is fixed in the sand belt toughness that Width appears, thus magnetic head 40 the form accuracy of vertical magnetic tape drive direction and with the radius " R of the magnetic tape drive direction of center, head gap and perpendicular head 40
Y" in the relevant precision of in the heart the deviation relevant form accuracy of (just with degree of eccentricity and so on) also be improved.When sand belt moulding guide block is when swinging in the mode that the same plane O around magnetic head sheet 40a center rotates, that is, when sand belt formed guide block 20a/20b cant angle theta angle, its underpart was convex as shown in Figure 11; When sand belt moulding guide block inclination-θ angle, its top is convex as shown in Figure 12.Therefore swing sand belt moulding guide block 20a/20b between-θ to θ angle constantly, Figure 11 and shape shown in Figure 12 have just obtained comprehensively, thereby have improved the form accuracy of magnetic head on vertical magnetic tape drive direction (thickness direction).As previously mentioned, need not rotate swing, and allow sand belt moulding guide block also be fine toward motion towards sand belt guide center line straight line is multiple.Can obtain excellent effect although hunting frequency is 1 to 2 He Zhi, there is no need this is made restriction.
Fig. 1 is the cut-open view (comprising sand belt guide parts, piece-holder tube, cylindrical shell driver part, sand belt moulding leader block parts and adjacent part) of the major part of a kind of embodiment of magnetic head buffing machine of the present invention;
Fig. 2 a is the skeleton view of the main part of magnetic head buffing machine shown in Figure 1;
Fig. 2 b is a skeleton view of explaining sand belt driving situation in the magnetic head buffing machine shown in Figure 1;
Fig. 3 is a top view of explaining the main partially polished situation of magnetic head buffing machine shown in Figure 1;
Fig. 4 is a top view of explaining the main situation before partially polished of magnetic head buffing machine shown in Figure 1;
Fig. 5 is the cut-open view of polishing magnetic-head part and magnetic head peripheral part in the magnetic head buffing machine shown in Figure 1;
Fig. 6 is the skeleton view of magnetic head buffing machine sand belt conveyer shown in Figure 1;
Fig. 7 is the skeleton view of major part of the sand belt moulding guide block of the another kind of embodiment of magnetic head buffing machine of the present invention;
Fig. 8 is the magnetic head polishing part of common magnetic head buffing machine and the cut-open view of adjacent part thereof;
Fig. 9 a to 9c is the cut-open view of the magnetic head sheet after the polishing;
Figure 10 adopts explanation magnetic head sheet radius and the chart for concerning between polishing magnetic-head sheet magnetic head overhang under the sand belt moulding guide block situation;
Figure 11 and 12 is situations that sand belt moulding guide block rotates swing in the magnetic head buffing machine of the present invention;
Figure 13 represents the relation between the gap between magnetic head sheet head radius and a pair of sand belt moulding guide block;
Figure 14 represents the relation between magnetic head sheet right angle orientation center of radius side-play amount and sand belt moulding leader block parts vertical offset amount;
Figure 15 is the skeleton view of magnetic head sheet;
Figure 16 is the cut-open view of magnetic head sheet; And
Figure 17 represents the influence of the difference of a shown in Figure 16 and b to magnetic head output.
Fig. 1 to 6 is depicted as first most preferred embodiment of the present invention.Magnetic head buffing machine shown in this embodiment has: sand belt guide parts C, it is bearing in a pair of sand belt guide 11a and 11b on the same axis, allow them freely to rotate, simultaneously, the gap delta between this sand belt guide 11a and the 11b can be adjusted to the numerical value of regulation; Piece-holder tube 30, it is bearing among the sand belt guide 11b of sand belt guide component c on the same axis, can rotate relative to this sand belt guide 11b; The piece-holder tube CD-ROM drive motor 31 of cylindrical shell driver part, it can drive this piece-holder tube 30 time interval in accordance with regulations and replace both forward and reverse directions motion; And sand belt gearing T, it can drive sand belt along the sand belt guide 11a of sand belt guide parts C and the outer circular motion of 11b.This piece-holder tube 30 can be clamped in the magnetic head 40 that needs to process in the above-mentioned gap delta easily, make its top stretch out a sand belt guide 11a and a regulation of 11b cylindrical apart from △ t, or unload workpiece easily.This buffing machine also has sand belt moulding leader block parts F, it has a pair of sand belt moulding guide block 20a and 20b, the sand belt seal face " P " with predetermined cornerite by sand belt guide 11a and the moulding of 11b cylindrical is arranged on the guide block, and this sand belt moulding leader block parts is pressed to the two ends of sand belt " 1 " Width the cylindrical of sand belt guide 11a and 11b towards sand belt guide axis direction.This buffing machine also has a pair of friction pulley 9a and 9b, and they and sand belt " 1 " rotate synchronously, and (at the relative opposite side of polishing moulding guide block contact side) contacts with the cylindrical of sand belt guide 11a and 11b simultaneously.
Elaborate below.Sand belt gearing T at first is described.Among Fig. 6, sand belt supply roll " 2 " and sand belt winding wheel " 10 " are arranged on the sand belt gearing bearing " 15 ".Sand belt " 1 " is contained between above-mentioned two wheels.Sand belt " 1 " is sent from sand belt supply roll " 2 ", pass pinch wheel " 3a " and driving wheel " 4a ", through stretching pulley " 7a ", guide wheel " 8a ", sand belt guide " 11a " and " 11b ", guide wheel " 8b ", stretching pulley " 7b ", pinch wheel " 3b ", driving wheel " 4b " is batched by sand belt winding wheel " 10 " at last.
During polishing, guide wheel 8a and 8b move to position shown in Figure 3, make sand belt " 1 " and the contact angle (the α angle among Fig. 3) of guide " 11a " and " 11b " cylindrical reach predetermined value (being 90 ° in this embodiment), and in preparatory stage and polishing intermittently the time, they get back to position shown in Figure 4 (driving method does not show) again.
Sand belt driving support seat 15 available step motor (not shown) are with step-by-step system bottom and top feed sand belt vertically.
The major part of this machine will be described below, and referring to Fig. 1 to 5, sand belt guide 11b includes the piece-holder tube 30 that is supported by bearing 34b.Piece-holder tube 30 can be one or more with the magnetic head 40(of need processing) be clamped on the end face, making it stretch out among this embodiment of sand belt guide 11b cylindrical preset distance △ t(is 150 μ m) (clamp method is not shown in the figures), the loading and unloading of workpiece can be carried out easily.Piece-holder tube 30 bottoms, piece-holder tube turning axle 32 meshes with its vertex of a cone and piece-holder tube CD-ROM drive motor 31 and links together.
The sand belt guide 11a that has with sand belt guide 11b same outer diameter as is bearing on the piece-holder tube bolster 33 by bearing 34a, with piece-holder tube 30 centerings, hangs down with sand belt 11b to constitute predetermined gap δ (being 2mm in this embodiment) jointly.Sand belt guide 11a and piece-holder tube bolster 33 are by sand belt guide vertical feed 35 and 36 supportings (not representing its driving mechanism among the figure) of sand belt guide vertical feed headstock.
Two sand belt moulding guide block 20a and 20b have the sand belt seal face, and its external diameter is 62mm, highly is 7mm, and it can contact with the lateral parts of predetermined pressure with sand belt 1.The seal face of sand belt moulding guide block 20a and 20b can be made with the resin (as fluorocarbons resin, nylon) of low-friction coefficient, and other parts then are fabricated from iron.
Sand belt moulding leader block parts F comprises sand belt moulding guide block 20a, 20b, sand belt moulding guide block gap fine setting step 21, it can adjust sand belt moulding guide block gap Wa and Wb(is respectively 3.5mm in this embodiment), gap fine-tuning nut 21a and 21b between sand belt moulding guide block, contact condition is adjusted nut 22a and 22b, can adjust the contact condition of sand belt moulding guide block 20a and 20b, Z to dull and stereotyped 26 usefulness so that the processed object of magnetic head 40() locate at its thickness direction, Z adjusts nut 23 to plate height, X is to dull and stereotyped 27, in order to sand belt moulding guide block 20a and 20b are pressed to sand belt 1, compacting part 29, angle measurement platform 25 can make whole sand belt moulding guide block 20a and 20b tilt, and the adjustment nut 28 of inclination angle measurement platform 25.Also available angle measurement platform inclination motor 28 ' replace adjusting nut 28.
The operation of the magnetic head buffing machine that constitutes according to said structure will illustrate below.
Take off the sand belt guide 11b that is with piece-holder tube 30 from machine, load onto for example 2 of several magnetic head 40(to be processed in piece-holder tube 30 end face precalculated positions), predetermined distance △ t is stretched out at their top.11b is contained on the machine with the sand belt guide, and makes the bottom and the engagement of piece-holder tube turning axle 32 tops of this piece-holder tube.
Then, utilize sand belt guide vertical feed 35, sand belt guide 11a descended, and with sand belt guide 11b pairing, make two gap delta between cylindrical shell reach setting, friction pulley 9a is contacted with 11b with sand belt guide 11a with 9b.
After the starting of magnetic head buffing machine, under the effect of above-mentioned driving mechanism, guide wheel 8a and 8b advance to position shown in Figure 3 by position shown in Figure 4, with the cornerite of realizing regulation sand belt 1 are pressed on sand belt guide 11a and the 11b cylindrical.Pinch wheel CD-ROM drive motor 5 is rotated simultaneously, sand belt 1 is twisted on the sand belt winding wheel 10, and make sand belt produce the tension force of regulation.After adjusting the sand belt moulding guide block pitch angle (being adjusted to 0 ° among this embodiment) of the sand belt moulding guide block gap Wa of regulation and Wb and regulation, advance sand belt moulding leader block parts F with pressure cylinder 29, and contact with 11b with sand belt guide 11a with predetermined pressure.31 startings of piece-holder tube CD-ROM drive motor, rotation (its peripheral speed is 2800m/min in this embodiment) at a predetermined velocity.Piece-holder tube CD-ROM drive motor 31 alternately makes 30 rotatings of piece-holder tube by predetermined each time interval (being 3 seconds in this embodiment) of timer.Piece-holder tube CD-ROM drive motor 31 alternately rotating becomes to have the circle of desired radius-of-curvature with magnetic head contact with tape mirror polish, and can not produce deviation.By the rotating (each is 6 times) of piece-holder tube 30, after polishing was finished, sand belt moulding leader block parts F retreated, and makes guide wheel 8a and 8b get back to position shown in Figure 4.Then, stop piece-holder tube CD-ROM drive motor 31 and pinch wheel CD-ROM drive motor 5.Rise sand belt guide vertical feed 35.Unload piece-holder tube 30 and sand belt guide 11b with a kind of kinematic train (not showing on the figure) from this buffing machine.So far, finish a polishing process.
Fig. 2 b expressed separately sand belt 1 by and be pressed in situation on sand belt guide 11a and the 11b by sand belt moulding guide block 20a and 20b.
The reason that needs rotating as for piece-holder tube CD-ROM drive motor 31, be that the contact force between sand belt 1 and the magnetic head sheet 40a increases at sand belt approaching side (magnetic head rotation direction front side), therefore the processing capacity of that side also is (processing capacity (Q) the α speed (V) * pressure (P) * coefficient (C)) that increases, and therefore counter-rotating just can make magnetic head be polished to the identical circle at relative magnetic head center.The sand belt polishing all has this situation.
Sand belt bearing 15 equals the thickness of magnetic head 40 on the vertical moving direction (hypothesis (sand belt width)-(sand belt moulding guide block width)=W, this amount of feeding is less than W) here with step-by-step system to the amount of feeding of sand belt.
Another piece-holder wound packages that magnetic head 40 to be processed will be housed with the top kinematic train of mentioning has just begun next polishing process circulation after on the piece-holder tube turning axle of buffing machine, then carries out each later circulation.
After magnetic head 40 polishing process of predetermined quantity are finished, shut buffing machine.
Although, for preventing the friction of sand belt guide.As mentioned above, the sand belt guide be with this embodiment in the speed of feed rotation synchronously of sand belt 1, the sand belt guide is still and can stops.If the sand belt moulding guide block of this method is to be used in sand belt guide and piece-holder tube all with the occasion of same high speed rotating, also can obtain above-mentioned identical effect.
Subsequent, the magnetic head sheet that processes with magnetic head buffing machine of the present invention is described.
Be fixed on magnetic head sheet (wide 2.3mm * high 1.7mm * thick 0.14mm) the process polishing on the magnetic head 40, obtained high-precision contact with tape face, have desired 4mm radius-of-curvature, the center of curvature is positioned at magnetic head sheet center.Mass change between each circulation of polishing process is very little.
Compare with the prior art that does not adopt sand belt moulding guide block, from the magnetic head sheet radius R of this embodiment acquisition
XAnd R
YVariation reduced greatly, this can be as can be seen from Figure 13.If as shown in Figure 14, sand belt moulding guide block moves the magnetic head sheet top center of curvature, the i.e. radius R of right angle orientation along vertical sand belt driving direction
YThe center also be offset, side-play amount is directly proportional with the amount of movement of sand belt moulding guide block, like this, the magnetic head sheet just can be polished to desired shape.
If perpendicular to two section A-A of sand belt driving direction ' and B-B ' take from by what L and L ' separated to leave two positions that the magnetic head sheet transmits gap 50 along the sand belt driving direction, referring to Figure 15, then can obtain shown in Figure 16 to have the magnetic head radius R in this vertical cross-section direction
YSection.Suppose that the contact with tape face top surface level of this section and the distance at contact with tape face and intersection location place, magnetic head sheet side are respectively a and b, referring to Figure 16, the absolute value of supposing the difference of a and b is P, then has relation shown in Figure 17 between the output of magnetic head and the P.Numerical value among Figure 17 is to obtain under the situation of scope≤0.2mm of (L, L ').If the P value surpasses 0.1 μ m, as shown in Figure 17, characteristic of magnetic head can degenerate at the curve place of steeply inclined.Therefore from the viewpoint of characteristic of magnetic head, under the situation of the scope≤0.2mm of (L, L '), the magnetic head of P value≤0.1 μ m is desirable.Little P value means that the magnetic head sheet head center of curvature near magnetic head sheet mid-depth, has guaranteed extraordinary symmetry.In this embodiment, the magnetic head that obtains has the P value less than 0.1 μ m.Under the constant situation of other processing conditions, the P value of the magnetic head sheet of producing with the prior art that does not adopt sand belt moulding guide block is about 0.25 μ m.
From aforesaid embodiment, can draw following effect:
(A) compress owing to sand belt 1 polished band moulding leader block parts F, the change in location of the processed relatively object of sand belt 1 reduces, the shape that the contact with tape face of magnetic head 40 is polished has desired radius-of-curvature, and the center of curvature is positioned at magnetic head sheet mid-depth.
(B) because sand belt 1 polished band moulding leader block parts F compresses, and the toughness of sand belt 1 performance improves, thus might be by adjusting the radius-of-curvature that snap-in force and sand belt moulding guide block gap Wa and Wb control contact with tape.
(C) if sand belt moulding guide block 20a and 20b tilt with the way generation of the angle measurement platform 25 of adjusting sand belt moulding leader block parts F, with the snap-in force between change effect sand belt guide 11a and the 11b, the radius-of-curvature center that then is formed on the magnetic head 40 contact with tape faces can be by desired value skew.
(D) because the sand belt snap-in force " P " of sand belt moulding guide block 20a and 20b is formed by the low-friction coefficient resin, the friction that sand belt 1 produces is so little, will never stop up the phenomenon of sand belt motion.As a result, the polishing process of magnetic head is stable and even.
(E) because the speed of feed of pressing sand belt 1 of friction pulley 9a and 9b is rotated sand belt guide 11a and 11b's, so that sand belt guide 11a and 11b are synchronous with sand belt 1, sand belt guide 11a and 11b can not produce friction (so the overhang of work piece can not change), can keep the precision of magnetic head buffing machine for prolonged period of time like this, thereby prolong its serviceable life.
(F) after a polishing process circulation is finished, sand belt bearing 15 is with the step-by-step system feeding sand belt that makes progress, at next circulation time, the contact with tape face is polished by new sand belt polished surface again, therefore the contact with tape face can not produce the defective that scratches a class, guarantees to obtain very good surface of contact.
Fig. 7 is the skeleton view of the major part of magnetic head buffing machine second embodiment.
Sand belt moulding guide block 20a ' and 20b ' are provided with groove 43a and 43b, can be to sand belt surface of contact P ' injection air.
This structure can make sand belt 1 be compressed by the air pressure from above-mentioned groove 43a and 43b ejection, and sand belt 1 can not contact with 20b ' with sand belt moulding guide block 20a '.Like this, sand belt will never be blocked, can guarantee to polish stably processing.
Although friction pulley 9a and 9b all have been installed in the foregoing description 1 and 2, allowing them drive sand belt guide 11a and 11b and sand belt 1 rotates synchronously, contact with the 11b cylindrical with sand belt guide 11a simultaneously, this effect of this buffing machine also can obtain without these friction pulleys 9a and 9b.But, as mentioned above, the wearing and tearing that this friction pulley more can reduce sand belt guide 11a and 11b have been installed.
Although in the foregoing description 1 and 2, the driving direction of sand belt 1 is in the axis direction of vertical sand belt guide 11a and 11b, drives with the direction of sand belt guide oblique also to allow.This inclination operation can be finished by sand belt bearing 15.
Tilted direction drives the length that sand belt can utilize sand belt well, and the contact with tape face of magnetic head 40 can be always with the new polished surface polishing of sand belt 1, and this is very favourable.
Although in the foregoing description 1 and 2, only used a magnetic head buffing machine polishing magnetic-head 40, for reducing process time and raising the efficiency, can use rough polishing band 1 earlier, and then the thinner sand belt that uses in order, to improve the polishing quality.In this case, as an example, the described buffing machine of the foregoing description can be divided into the rough polishing machine, middle buffing machine and finishing polish machine, and the granularity of sand belt 1 is available concerning the rough polishing machine
#4000, middle buffing machine can be used
#8000, the finishing polish machine can be used
#10000.Use conveyer to transmit then between each buffing machine, piece-holder tube 30 and sand belt guide 11b can be contained on the piece-holder tube driving shaft 32 and from this driving shaft and unload down.
Embodiment 3:
Among this magnetic head buffing machine embodiment, angle measurement platform inclination motor 28 ' with the inclination angle measurement platform 25, all the other are identical with embodiment 1 except that always being provided with.This motor 28 ' be used for making whole sand belt moulding guide block 20a and 20b to rotate swing.
Magnetic head finishing method among this embodiment, except that sand belt moulding guide block 20a and 20b like that alternately tilted between-θ and θ angle shown in Figure 11 and 12, all the other were identical with embodiment 1.The frequency of swing is adjusted to 2 He Zhi.
Among this magnetic head buffing machine embodiment, sand belt moulding guide block is forced moulding, and the moulding guide block rotates swing, improving the form accuracy of vertical magnetic tape drive direction, thereby produces the magnetic head that can guarantee good contact with tape face.
Although in the foregoing description, sand belt moulding guide block has adopted the pendulum rotating flowing mode, but the little mode of vibration that adopts the perpendicular head rotation direction makes sand belt moulding the guide block equidirectional or opposite direction up-down vibration with the distance of regulation at one time, also can reach identical effect.
Except that sand belt moulding guide block is set sand belt is pressed in the sand belt guide, the prior art in this field all can be used for magnetic head buffing machine of the present invention.
Prosign in the above-mentioned accompanying drawing and code name replace with a part.
Above-mentioned explanation proves that the present invention can reduce magnetic head contact with tape surface error, forms desired shape.
Claims (12)
1, a kind of magnetic head (40,40a, the finishing method of contact with tape face 40b), wherein magnetic head stretches out sand belt guide (11a, 11b) cylindrical regulation overhang (△ t), sand belt (1) by and by a pair of sand belt guide (11a, 11b) outside surface guiding, this sand belt guide (11a, 11b) each other axially relatively, has specified gap (δ), described magnetic head is clamped in the described gap, the invention is characterized in, at magnetic head (40,40a, in the time of 40b) contact with tape mirror polish, with sand belt moulding leader block parts (20a with rounded internal surface, 20b) sand belt (1) Width is removed in the face of magnetic head (40,40a, 40b) the outer circumferential location up and down of part is pressed on the sand belt guide (11a and 11b).
2,, it is characterized in that described sand belt (1) is to use air compaction from the ejection of the rounded internal surface of this sand belt moulding guide block (20a, 20b) on sand belt guide (11a, 11b) according to the described magnetic head finishing method of claim 1.
3,, it is characterized in that magnetic head (40,40a, 40b) is along with described that swing to sand belt moulding guide block (20a, 20b) is polished according to the described magnetic head finishing method of claim 1.
4, according to the described magnetic head finishing method of claim 3, it is characterized in that described swing is to rotate swing, its center of rotation is positioned at the plane by magnetic head sheet (40a) thickness direction center.
5, a kind of magnetic head buffing machine comprises sand belt guide parts, it supporting a pair of axially toward each other, have the sand belt guide (11a, 11b) of specified gap (δ) to allow freely to rotate; A piece-holder tube (30), it is bearing in this sand belt guide (11b) with one heart in the mode that can rotate relative to the axis of a described sand belt guide (11b); A cylindrical shell driver part (31), it allows this piece-holder tube (30) interior at interval at the fixed time along positive dirction and opposite spin; The sand belt gearing, it allows sand belt (1) to move on the cylindrical of sand belt guide (11a, 11b); And magnetic head (40,40a, 40b) is clamped in the device in the above-mentioned gap, make its top stretch out the distance (△ t) of sand belt guide (11a, 11b) cylindrical regulation, and workpiece loading and unloading easily; This magnetic head buffing machine is characterised in that, be provided with a pair of sand belt moulding guide block (20a, 20b), they have the axial distance (D) of regulation toward each other, have sand belt (1) is pressed on internal circular surfaces on regulation cornerite (α) cylindrical of sand belt guide (11a, 11b).
6, by the described magnetic head buffing machine of claim 5, the sand belt surface of contact (P) that it is characterized in that described sand belt moulding guide block (20a, 20b) is by the low-friction coefficient resin forming.
7, by the described magnetic head buffing machine of claim 5, it is characterized in that the sand belt seal face (P) of described sand belt moulding guide block (20a, 20b, 20a ', 20b ') is provided with the groove (43a, 43b) of injection air.
8, by claim 5 or 6 or 7 described magnetic head buffing machines, it is characterized in that equipment has two friction pulleys (9a, 9b), (11a, 11b) contacts with the sand belt guide, and drives them to rotate with the speed of sand belt speed (1) speed synchronization.
9, by each described magnetic head buffing machine in the claim 6 to 8, it is characterized in that being provided with sand belt driving support seat (15), its along vertical sand belt direction of motion with regulation apart from feeding sand belt (1).
10, by the described magnetic head buffing machine of claim 5, it is characterized in that having the device that makes sand belt moulding guide block (20a, 20b) rotation swing, its oscillation centre is in passing through the plane at magnetic head sheet (40a) thickness direction center.
11, by the described magnetic head buffing machine of claim 10, it is characterized in that the device of the described swing that rotates, form by angle measurement platform (25) and angle measurement platform inclination motor (28).
12, a kind of finishing method and magnetic head of making of the buffing machine of claim 5 with claim 1, wherein on the cross section of vertical magnetic tape drive direction, and this cross section on the magnetic tape drive direction apart from the transmission gap (50) of magnetic head sheet (40a) in the 0.2mm scope, " establish along magnetic head sheet thickness direction " perpendicular to the center line of magnetic head sheet and the tangent line that contacts with this magnetic head sheet (40a) top, and the distance between " at the point of the described center line vertical range 0.05mm of distance on the contact with tape face " is " a " and " b ", then | and the value of a-b| is less than 0.1 μ m.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP280105/88 | 1988-11-05 | ||
| JP63280105A JPH0790457B2 (en) | 1988-11-05 | 1988-11-05 | Magnetic head wrapping device |
| JP202155/89 | 1989-08-03 | ||
| JP1202155A JP2568276B2 (en) | 1989-08-03 | 1989-08-03 | Method and apparatus for polishing sliding surface of magnetic head tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1042618A CN1042618A (en) | 1990-05-30 |
| CN1018251B true CN1018251B (en) | 1992-09-16 |
Family
ID=26513213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89108777A Expired CN1018251B (en) | 1988-11-05 | 1989-11-04 | The magnetic head that magnetic head finishing method and buffing machine thereof and this method are produced |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR920008432B1 (en) |
| CN (1) | CN1018251B (en) |
| DE (1) | DE3936931A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5274993B2 (en) * | 2007-12-03 | 2013-08-28 | 株式会社荏原製作所 | Polishing equipment |
| CN102756318A (en) * | 2011-11-24 | 2012-10-31 | 上海腾企机械技术配套有限公司 | New process and system for processing inner/outer curved surface in cutting-in type milling/grinding/polishing |
| CN115338745B (en) * | 2022-08-08 | 2023-11-17 | 国网浙江省电力有限公司江山市供电公司 | Grinding device and grinding method for equipment for hydroelectric power generation |
| CN117020804B (en) * | 2023-10-09 | 2023-12-22 | 启东市洁慧新材料有限公司 | Grinding device for slitting and winding edges of vulcanized fiber paper and application method of grinding device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55101130A (en) * | 1979-01-20 | 1980-08-01 | Matsushita Electric Ind Co Ltd | Polishing method of magnetic head |
| JPS5727652A (en) * | 1980-07-18 | 1982-02-15 | Fujitsu Ltd | Equipment for lapping with tape |
| JPS5813972A (en) * | 1981-07-17 | 1983-01-26 | 三洋電機株式会社 | Method of promoting refrigeration |
| DE3521840A1 (en) * | 1984-12-04 | 1986-06-05 | Carborundum Schleifmittelwerke GmbH, 4000 Düsseldorf | Improved grinding shoe for pressing a circulating grinding belt of a belt-grinding machine onto the workpiece to be machined, and process for grinding plate-shaped materials |
| JPS62203749A (en) * | 1986-03-04 | 1987-09-08 | Sanyo Electric Co Ltd | Grinding device for magnetic head |
| JPH069781B2 (en) * | 1986-05-29 | 1994-02-09 | 株式会社ベルデックス | Magnetic head polishing method and apparatus |
-
1989
- 1989-10-24 KR KR1019890015254A patent/KR920008432B1/en active IP Right Grant
- 1989-11-04 CN CN89108777A patent/CN1018251B/en not_active Expired
- 1989-11-06 DE DE3936931A patent/DE3936931A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE3936931A1 (en) | 1990-05-10 |
| CN1042618A (en) | 1990-05-30 |
| KR920008432B1 (en) | 1992-09-28 |
| KR900008447A (en) | 1990-06-03 |
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