JPH0361245B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a method of manufacturing a slider for a magnetic head, and more particularly, to a method of manufacturing a slider for a magnetic head, which efficiently manufactures a bulk type slider made of ceramic material and having a complicated shape. Prior Art Sliders for magnetic heads are made of TiO ₂ -BaO-based or TiO ₂ -CaO-based non-magnetic ceramic materials, and various types of sliders other than straddle-type sliders and composite-type sliders are mainly made of the above-mentioned sintered bodies. Cutting and forming into the desired shape,
It was manufactured. As shown in Fig. 3, the bulk type slider has an L-shaped cross section, and the bottom of the L-shape serves as a sliding surface 5 for contact with the recording medium, and has a sliding groove 6. It is manufactured by cutting from a solid block, and an I-shaped core 10 is arranged on the center side and L-shaped cores 11 on both sides are arranged on the abutment facet 7 on the short width side of the bulk type slider 2, and glass welded or resin is attached. The bonded assembly core 3 is brought into contact with the reinforcing member 4 and fixed by glass welding or resin bonding, thereby assembling the magnetic head slider. Problems to be Solved by the Invention In the slider 2 having the above shape, the I of the assembly core 3 is
Because the support of the mold core 10 is weak, it is easy to break.
It is difficult to maintain the parallelism and perpendicularity between the slider 2 and the assembly core 3, resulting in a problem of lower product yield and higher costs. Therefore, a support part 8 is installed parallel to the I-shaped core 10 on the side of the contact surface 7 of the slider 2 with the assembled core 3.
The support portion 8 is provided so as to be perpendicular to the sliding groove 6 of the slider, and as shown in FIG.
A slider 1 has been proposed in which the contact surface side is formed into a T-shape. When the slider 1 is joined to the assembly core 3, mutual parallelism and perpendicularity are maintained and they are stably fixed, making it possible to assemble with high precision, simplifying the assembly process and improving product yield. However, the conventional manufacturing method, which involves cutting from a sintered block,
Because of the complex shape shown in FIG. 2, it has been extremely difficult to manufacture or mass-produce the slider while satisfying the strict dimensional tolerances required of the slider. In view of the current situation, the object of the present invention is to provide a method for manufacturing a slider for a magnetic head, which efficiently manufactures a bulk type slider made of ceramic material and having a complicated shape. The purpose of this invention is to provide a method for manufacturing a slider for a magnetic head that can be machined. Means for Solving the Problems This invention provides a molded body block having a shape on one main surface of a plate.
It has a convex shape with a height of 15% to 30%, and an opening angle of 90° to 120° in the short side direction at the center of the other main surface, which is 30% to 50% relative to the length of the molded body block. % groove width V
Each T-shaped part of the convex part has a shape with a shaped groove, and the end face of the short side of the block becomes the sliding surface of the slider, and two T-shaped parts are arranged in opposite directions through a shallow groove. is the contact surface with the assembly core, and the shallow groove is the adhesive reservoir.A molded body block is sintered in the shape of two bulk type sliders connected in opposite directions, and the sintered body block is attached to the short side end face. This method of manufacturing a slider for a magnetic head is characterized in that the shallow groove is divided into two parts in parallel at the center and then finished into a slider. Disclosure of the invention based on operational drawings Figures 1 and 2 are perspective views showing a method for manufacturing a bulk type slider according to the present invention, with Figure 1 being a sintered block and Figure 2 being a finished slider. FIG. First, the sintered body block 20 shown in FIG. 1 is sintered, and the sintered body block 20 has a plate-like structure with a height of 15% to 30% of the length of the formed body block on one main surface. A V-shaped groove 21 having a protrusion in the shape of a letter and having an opening angle of 90° to 120° in the short side direction and a groove width of 30% to 50% of the length of the molded body block in the center of the other main surface. The short side end face 22 of the block 20 becomes the sliding surface 5 of the slider, and the T-shaped protrusion 24 and 25 are arranged in opposite directions with a shallow groove 23 interposed therebetween. The T-shaped protrusions 24 and 25 become the contact surfaces with the assembly core 3, that is, the contact facets 7 and the support part 8, and the shallow grooves 23 become the adhesive reservoir part 9.The bulk type slider 1 is turned upside down. It consists of two pieces connected by an adhesive reservoir in the same direction. To obtain this sintered body block 20, for example,
TiO ₂ -BaO-based, TiO ₂ -CaO-based non-magnetic ceramic powder is filled into the space formed by the short cylindrical die and the lower punch whose upper surface has the desired shape, and then the upper punch whose lower surface has the desired shape is formed. Press molding is performed at a required pressure, and the resulting molded body is sintered. The short side dimension of the molding space of the die is slider 1
(L+a)/(1-α/
100), and the long side dimension is (2h+b)/(1-
β/100). On the lower punch, in order to form a V-shaped groove 21 with an opening angle θ, a convex shape having a triangular cross section with an apex angle θ is provided to protrude in the short side direction of the center of the punch plane. The upper punch has a short side dimension of 1/2 {(L+a)/(1-α/100) -t/(1-γ/100)} to form the convex part in the shape of a letter. t is the width of the support part 8, γ is the shrinkage rate during sintering in the width direction of the support part 8, and the long side dimension is 1/2{(2h+b)/(1-β/100) 2-2m/(1-δ /100)} However, m is the thickness of the sliding surface 5, and δ is the shrinkage rate during sintering in the thickness direction of the sliding surface 5.
A protrusion for forming the shallow groove 23 is provided between the two protrusions. Further, the other main surface of the sintered body block 20 is provided with a V-shaped groove 21 having a specific opening angle and groove width in the direction of the short side end surface 22 at the center thereof, and the other main surface has no groove. If such a sintered body is obtained in a flat shape, cracks, chips, and warpage occur frequently. In other words, this V-shaped groove 21 serves as a deformation preventing portion that prevents cracking, chipping, and warping of the sintered body. The V-shaped groove 21, which serves as a deformation prevention part during sintering, has a large influence on the deformation prevention effect, especially the opening angle and groove dimensions, and must be selected appropriately according to the sintering composition, slider dimensions, etc. The angle is preferably 90° to 120°, the groove width l is preferably in the range of A = l / (2h + b) = 30 to 50% with respect to the length of the molded body, and the height n of the convex portion of the molded body is preferably in the range of 30 to 50% of the length of the molded body. On the other hand, by setting B=n/(2h+b)=15% to 30%, the effect of preventing deformation during sintering can be obtained. If the opening angle of the V-shaped groove 21 is less than 90° or more than 120°, there will be no deformation prevention effect, and the l/
If (2h+b) is less than 30% or more than 50%,
This is not preferable because it does not have a deformation prevention effect and warpage occurs more frequently. Furthermore, n/(2h+b) is 15%
If it is less than 30%, the processing allowance will increase and the yield will decrease, and if it exceeds 30%, there will be no warpage prevention effect, which is not preferable. After obtaining the above-mentioned sintered block free from cracks and warpage, the block 20 is divided into two parts parallel to the short side end face 22 at the center of the shallow groove 23, and each material is finished into the required dimensions and shape. , 2 from 1 block
A bulk type slider 1 for a magnetic head can be obtained. As shown in FIG. 2, the present invention provides a slider 1 having a complicated shape, in which the contact face side with the assembly core 3 is formed into a T-shape by the contact facet 7 and the support part 8.
Two sliders can be easily and precisely obtained by cutting from one sintered block, and there are no cracks or warps, and the manufacturing efficiency is extremely high. Example To obtain the sintered compact block shown in Fig. 1, a die (forming space plane width 10.02 mm x length 11.02 mm) and upper and lower punches (punch plane dimensions width 10 mm x length 11 mm) were used. TiO ₂ 85wt%,
A die was filled with ceramic powder having a composition of 15 wt% BaO, and the powder was press-molded to obtain a compact for a sintered block. Short side end surface 22 of the obtained sintered body block 20
Two sliders were obtained by dividing the shallow groove 23 into two at the center parallel to the . The depth and opening angle θ of the V-shaped groove that serves as the deformation prevention part, A=l/(2h+b) and B=n/
Table 1 shows the results of investigating the relationship between (2h+b) and the amount of cracking and deformation of the sintered body (average value of 10 pieces). As is clear from the results in Table 1, it can be seen that the V-shaped grooves in the sintered block are extremely effective in preventing cracking and warping of the sintered body.

[Table] Rate.
Effects of the Invention As is clear from the examples, the manufacturing method according to the present invention shows that the V-shaped groove of the sintered body block is extremely effective in preventing cracks and warping of the sintered body, and that This is a method for manufacturing a slider for a magnetic head, in which a plurality of sliders can be cut and a bulk type slider having a complicated shape can be efficiently manufactured.

[Brief explanation of drawings]

1 and 2 are perspective views showing a method of manufacturing a bulk type slider according to the present invention; FIG. 1 is a perspective view of a sintered body block, and FIG. 2 is a perspective view of a finished slider. FIG. 3 is a perspective view showing a conventional method of assembling a bulk type slider and an assembly core. 1, 2...slider, 3...assembly core, 4...
...Reinforcement member, 5...Sliding surface, 6...Sliding groove, 7...
... Contact facet, 8 ... Support part, 9 ... Adhesive reservoir part, 20 ... Sintered compact block, 21 ... V-shaped groove, 22 ... Short side end surface, 23 ... Shallow groove, 24,
25...T-shaped protrusion.

Claims (1)

[Claims] 1. One main surface of the plate has a convex shape with a height of 15% to 30% of the length of the molded body block, and the central part of the other main surface has an opening angle of 90° in the short side direction. It has a V-shaped groove with an angle of ~120° and a groove width of 30% to 50% of the length of the molded body block, and the end face of the short side of the block becomes the sliding surface of the slider, making the T-shape a shallow groove. Two bulk-type sliders are placed in opposite directions, with each T-shaped part of the two T-shaped convex parts arranged in opposite directions through the holder, and the shallow grooves become adhesive reservoirs. Manufacture of a slider for a magnetic head characterized by sintering a connected shaped compact block, dividing the sintered compact block into two parts parallel to the short side end face at the center of the shallow groove, and then finishing it into a slider. Method.