JPH02156488A - Manufacture of magnetic head and its device - Google Patents

Abstract

PURPOSE:To perform tightening with high accuracy by attracting a male screw to the aperture part of a motor driver, moving it to the upper side of a female screw, and abutting a driver supporting bar on the chamfer of the female screw by lowering, and performing the tightening by limiting the lowering of the driver. CONSTITUTION:The male screw 4 is attracted from a parts feeder part and carried to the position of the female screw 3 on a prescribed head arm 2. A connection guide plate 11 is moved by a pick-and-place unit part, and also, upper and lower holding plates 12 are moved by an air cylinder 14. The holding plates 12 are lowered by an air cylinder 14 in such state, and a screw 22 for stopper is brought into contact with the arm 2, which limits the lowering of the motor driver 20. The male screw 4 is brought into contact with the tapered part of the female screw 3, and a flexible supporting bar 15 is inclined due to reaction, thereby, the deviation of the male screw 4 and be absorbed. A pit 25 regulated by a spring 27 is engaged with the slot of the male screw 4, thereby, screw tightening can be performed with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head for a magnetic disk type storage device (hereinafter referred to as
This invention relates to a manufacturing method and apparatus for assembling a magnetic head for HDDs, and in particular a method for manufacturing a magnetic head suitable for tightening and fixing a load supporting spring part in a magnetic head to a head arm with a male screw having a small diameter and short length. and regarding equipment.

[Conventional technology]

As shown in FIG. 7(a), the HDD magnetic head assembly is composed of a load supporting spring section 1 and a head arm 2 to which a data transfer FPC 5 is attached, which are connected by screws. The reason why the load support spring part 1 is fastened with screws is to make the load support spring part 1 easy to replace and to reduce the distortion during installation. The male screw 4, which is fastened to the female screw 3 having a chamfered part, has an extremely small diameter (approximately 1 m in diameter) and a short length (approximately 1.7 m in diameter), as shown in Fig. 7(b).
), and a slot 4a is formed in the head.

The HDD magnetic head assembly is the most important part of the HDD magnetic head, and among them, the load supporting spring section 1 constitutes the most important part that determines the head performance.

Therefore, the accuracy of tightening is extremely important.

The tightening conditions for this screw are 200g torque.
-am, and a control value of 160g-cs±50g-cs is required as a control value for quality check standards.

However, the screw fastening of the HDD magnetic head assembly has the following disadvantages.

(1) The floating space of the head is small, and in order to prevent the disk surface from getting dirty, it is not possible to apply oil when tightening the screws, which is used to keep the frictional force constant, and the screws must be tightened without lubrication. The tightening torque is likely to fluctuate.

(2) The material of the male screw 4 is SUS, and the head arm 2
Since it is made of aluminum, the female thread 3 is easily damaged.

(3) Since the male screw 4 has a small diameter, short length, and fineness, the method for securing the reliability of tightening force is to directly control the screw axial force or directly control the displacement of the tightened body. is not adopted, and only indirect torque methods are available, which are relatively unreliable.

Due to the disadvantages mentioned above, a means to ensure high reliability has become a major issue. How to tighten the male screw 4 to the female screw 3 with high precision.

If there is one misalignment that requires highly accurate alignment of the two, problems may occur such as the male screw 4 not fitting into the hole of the female screw 3 and sticking out, or being tightened while biting diagonally. In order to solve this problem of not being able to tighten, conventional means include means for automatically recognizing the position of the female screw using a TV camera or ultrasonic waves, etc., and automatically aligning the position. As one of the methods, a compliance method is adopted. In this method, the vertical shaft that holds the male screw is made of a material with relatively high rigidity, and the vertical shaft is moved horizontally by the horizontal force generated when the male screw comes into contact with the chamfered part of the female screw. The external thread is arranged so that the axis of the internal thread coincides with the axis of the internal thread. Also, as one of the publicly known prior art,
There is one disclosed in Japanese Patent No.-134628. This consists of an upper base and a lower base supported by a guide shaft so as to be movable up and down, a drive shaft connected to the upper base via a universal joint, which is loosely inserted into the lower base, and a driver bit holding a male thread at the lower end of the drive shaft. The screwdriver bit is connected to the lower base, and an elastic body is interposed between the driver bit and the lower base.

If the positions of the male and female screws do not match, the elastic body is displaced by the water reaction force generated by contact between the two, and the male screw is moved horizontally while maintaining the vertical orientation of the male screw using the universal joint. This is for positioning.

[Problem to be solved by the invention]

The positioning means using a TV camera or the like described above allows for highly accurate positioning, but has the problem of being extremely expensive. In addition, compliance method and JP-A-59
The means shown in Japanese Patent No.-134628 is as follows.

In the case of a male screw with a small diameter and short length, the component force generated by contact is too small and difficult to apply. Also.

If the pressing force of the male thread is increased in order to increase the force component, centering becomes possible, but force is applied to the threaded surface, creating a problem in which it becomes difficult to control the tightening torque. Therefore, in the past, after temporarily tightening with a commercially available electric screwdriver, an experienced person would not be able to make a noise.

The final tightening was done by hand using a torque screwdriver, taking care to avoid abnormal tightening by touch or visual inspection. However, this method does not improve work efficiency and has the problem that it must be done by a specific worker. In addition, there arises the problem that it is not possible to rationalize production or stabilize quality.

The present invention is relatively inexpensive, allows for highly accurate tightening without requiring specific skilled workers, maintains the tightening torque within a standard value, and is capable of manufacturing highly reliable HDD magnetic head assemblies. The purpose of the present invention is to provide a method and apparatus for manufacturing a head.

Means for Solving CIIAM] The above-mentioned problem is solved by a magnetic head manufacturing method in which a magnetic head assembly is assembled by fixing a load supporting spring portion to a female screw having a tapered chamfered portion of the head arm with a male screw having a small diameter and short length. The lower end of an electric screwdriver has a screwdriver bit inside, which is attached to the lower end of a flexible elongated electric screwdriver support rod whose upper end is fixed and whose middle portion is held and hangs down, and which is supported via an elastic member. The female screw is attracted to the opening, the bit is locked to the slot in the head of the female screw, and the bit is moved and positioned near the upper position of the female screw, and then the electric screwdriver support rod is lowered and the middle portion of the bit is moved. The female screw is brought into contact with the chamfered part of the female thread while releasing the holding and hanging in a free state, and at the same time, the further lowering of the electric screwdriver support rod is restricted, and the chamfered part of the female thread is brought into contact with the female thread. The problem is solved by a method of manufacturing a magnetic head in which the female screw is moved along the axis of the female screw via the elastic member by the generated horizontal contact force, and in this state, the bit is rotated to tighten the screw, and the head is further rotated by a motor. An electric screwdriver comprising a bit stored and held inside via an elastic member, and a flexible elongated electric screwdriver support rod that suspends and supports the electric screwdriver at the lower end and releasably holds the intermediate portion on the fixed side. , consisting of a vertical holding plate connected to the upper end of the electric screwdriver support rod and slidably supported to be movable up and down on the fixed side, and a stopper member connected to the vertical holding plate to limit its lowering position. a screw tightening driver assembly section, a moving means for moving the electric screwdriver to a position above the female thread of the head arm, and a means for transporting the assembled head arm and load supporting spring section to a predetermined position before screw tightening. The problem is solved by configuring a magnetic head manufacturing apparatus including a conveying means for positioning, a supply means for supplying the female screw to the electric driver, and a control section for controlling the operation of each of the above parts.

[Effect]

The male screw taken out from the supply means is attracted to the lower open end of the electric screwdriver provided at the lower end of the flexible and elongated electric screwdriver support rod, and the bit in the electric screwdriver is engaged with the slot in the head of the male screw. do.

The electric screwdriver support rod is moved to a predetermined position by the moving means with its intermediate portion held on the fixed side. On the other hand, the load supporting spring portion and the head arm are positioned at predetermined positions by the conveying means, and the male thread and the female thread are positioned at opposing positions. At this point, the electric screwdriver support rod moves downward, releases its intermediate portion, and is restricted at its lower end, so that the male thread comes into contact with the tapered chamfered portion of the female thread. The flexible and elongated electric screwdriver support rod is suspended with its upper end supported, and the male screw that engages with the bit in the electric screwdriver is flexibly supported via an elastic member. Therefore, due to the small horizontal force generated at the chamfered portions of the male and female threads, the electric screwdriver support rod is bent and the first elastic member is deformed, and the male thread is aligned with the female thread.In this state, the bit is rotated. This allows for highly accurate screw tightening.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of an apparatus suitable for carrying out the present invention.

The device includes a screw driver assembly section 6 that attracts the male screw 4 and tightens the screw, a pick and place unit section (hereinafter referred to as P/P section) 7 that is the moving means for moving the male screw 4 to a predetermined position, and a screw driver assembly section 6 that attracts the male screw 4 and tightens the screw. The parts feeder section (hereinafter referred to as P/F section) 8, which is the supply means for supplying the parts to the screw tightening driver assembly section 6, and the load supporting spring section 1 and head arm 2 that were aligned and combined in the previous process. It is composed of a conveyor section 9 and a conveying pallet section 10, which are the conveying means for transporting to a predetermined position, and a control section 100 that synchronously controls each of the above sections.

2 and 3 show the detailed structure of the screw driver assembly section 6, which is the main part of this device.

A cylinder holding plate 13 is screwed and fixed to the upper part of the connecting guide plate 11 connected to the P/P section 7, and an upper and lower holding plate 12 is supported so as to be slidable in the vertical direction.

The vertical movement of the vertical holding plate 12 is performed by an air cylinder 14 fixed to the cylinder holding plate 13. Upper and lower retaining plate 1
The upper end of an elongated electric screwdriver support rod 5 having a small diameter (for example, about 8 mm diameter) is fixed to the screw 2 by a set screw 18, and is supported in a hanging manner. An electric screwdriver 20 is fixed to the lower end of the electric screwdriver support rod 5 via a driver holding plate portion 16, and the intermediate portion thereof is loosely inserted into a locking hole 19 of a cylinder holding plate 13.

Note that the steady rest piece 17 fixed to the intermediate portion of the electric screwdriver support rod 15 has its tapered portion removably in contact with the piece stopping hole 19.

The electric screwdriver support rod 15 is held in the middle. Below the vertical holding plate 12 is a vertical stopper holding plate 2.
1 is fixed, and a stopper screw 22 is attached to its lowermost end. The stopper screw 22 is used to limit the lowering end of the upper and lower holding plates, and prevents the electric screwdriver 20 from descending below the position where the male screw 4 attracted to the electric screwdriver 20 contacts the chamfered portion of the female screw 3. It is for the purpose of

Next, FIG. 4 shows the detailed internal structure of the electric screwdriver 20. The motor 23 is connected to the bit 25 via the bit holder 24.
are connected. The tip of the bit 25 is the slot 4 of the male thread 4.
It is formed in a shape that locks into a.

An internal spring 27, which is the elastic means, is interposed between the bit holder 24 and the support base that supports the motor 23. Further, the bit 25 is surrounded by a bit guide 26 and supported with a steady rest, and the opening of the bit guide 26 is formed so as to be able to attract the head of the male screw 4.

Next, the operation of the embodiment will be explained in more detail with reference to FIGS. 6(a) to 6(c).

FIG. 5(a) shows the state when the male screw 4 is sucked from the P/F part 8 and transported to the position of the female screw 3 of the head arm 2, and the connecting guide plate 11 is moved to the P/P part. 7, and the upper and lower holding plates 12 are moved by the air cylinder 14. In this state, the tapered part of the steady rest piece 17 fixed to the electric screwdriver support rod 15 fits into the piece fixing fixing 19, and the electric The driver support rod I5 is held in the middle to prevent the male screw 4 from falling due to vibration until just before it comes into contact with the female screw 3.

FIG. 5(b) shows a state in which the male thread 4 is in contact with the chamfered portion of the female thread 3 of the head arm 2.

In the state shown in Fig. 5(a), the P/P part 7 connects the male screw 4 with the female screw 3.
Move to a position opposite to the air cylinder I4.
As a result, the upper and lower holding plates I2 are lowered to the state shown in FIG. 5(b). In this state, the steady rest piece 17 has a hole 19 for the piece rest.
As it moves away from the head arm 2, the stopper screw 22
, and limits the lowering of the upper and lower retaining plates 12, thereby restricting the lowering of the electric screwdriver 20. Here, the male thread 4 is the female thread 3.
A small reaction force is generated due to the contact with the tapered portion of the electric screwdriver, and this reaction force causes the flexible and elongated electric driver support rod 15 to tilt, thereby absorbing the displacement of the male screw 4. As described above, the upper and lower retaining plates 12. Since the electric screwdriver support rod, the electric screwdriver 20, etc. are prevented from falling by their own weight, the male screw 4 is held only by the internal spring 27. In other words, the male screw 4 is the electric screwdriver support rod 1.
5 and the displacement of the internal spring 27, allowing it to move freely and easily.

FIG. 5(c) shows a state in which the aligned male screw 4 is tightened into the female screw 3, and this is done by the rotation of the motor 23. The male screw 4 is aligned with the female screw 3 as described above, but as shown in Figure 1, the bit 25 engages with the slot 4a in the head of the male screw 4 in a slightly inclined manner. However, as the male screw 4 is easily supported by the internal spring 27 as described above, and its under-neck dimension is short, the bit 25 comes into contact with the slot 4a easily, and there is no abnormal contact and no cracking occurs. This has been proven.

Next, FIGS. 6(a) and 6(b) show the effects of this embodiment. Figure 6(a) shows the positional deviation between the male thread 4 and the female thread 3 that can be tightened, and the chamfer diameter is 1.5 m.
In this case, it has been demonstrated that smooth screw tightening can be performed even if the male screw 4 is displaced in the X and Y directions by a size approximately equal to 1.56 mm.

FIG. 6(b) compares the variation in screw tightening torque in the manual process of the conventional technology and the variation in this embodiment. In the case of this embodiment, the screw tightening torque is the desired value (standard value).
It can be seen that it is well within the range of 160g-(!l±50g-am).

As can be seen from the above description, the apparatus of this embodiment does not use devices such as a TV camera or ultrasound, and can be implemented relatively inexpensively and easily.

〔Effect of the invention〕

According to the present invention, the male screw can be reliably moved toward the center of the female screw by the reaction force generated from the chamfered portion of the female screw, and since the pressing force from above is restricted only by the internal spring, excessive force can be avoided. The electric screwdriver's highly accurate screw tightening torque control can be transmitted directly to the joint between the male and female threads without applying it to the threaded part, making it possible to control torque for highly accurate tightening. As a result, a highly reliable screw tightening method was obtained, and an automatic screw tightening machine could be realized at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall structure of an embodiment of the present invention, Fig. 2 is a side view showing the detailed structure of a screw tightening driver assembly, which is the main part of the embodiment, and Fig. 3 is an arrow A in Fig. 2. FIG. 4 is an axial sectional view showing the internal structure of the electric screwdriver of the embodiment, FIGS. 5(a) to (C) are explanatory side views for explaining the operation of the embodiment, and FIG. Figure (aL (b) is an explanatory diagram for explaining the effect of the example, Figure 7 (a) is H
A perspective view showing the DD magnetic head assembly, FIG. 7(b)
) is a perspective view showing a male thread. l...Load supporting spring part, 2...Head arm, 3.
...Female thread, 4...Male thread, 4a...Slotted, 5
... FPC for data transfer, 6... Screw tightening driver assembly section, 7... Big and place unit section (P/P section), 8... Parts feeder section (P/F
part), 9... Conveyor part, lO... Conveying pallet part, 11... Connection guide plate, 12... Upper and lower holding plate,
13... Cylinder holding plate, 14... Air cylinder,
15... Electric driver support rod, 16... Driver support part, 17... Steady rest piece, 18... Set screw,
19... Hole for fixing the piece, 20... Electric screwdriver, 21
...Upper and bottom stopper holding plate, 22...Stopper screw, 23...Motor, 24...Bit holder, 25
. . . Bit, 26 . . Bit guide, 27 . . Internal spring, 100 . . Control unit.

Claims (1)

[Claims] 1. A method for manufacturing a magnetic head in which a magnetic head assembly is assembled by fixing a load supporting spring portion to a female screw having a tapered chamfered portion provided on a head arm with a male screw having a small diameter and short length, The lower end opening of an electric screwdriver has a screwdriver bit inside, which is attached to the lower end of a flexible elongated electric screwdriver support rod whose upper end is fixed and the middle portion is held and hangs down, and which is supported via an elastic member. The male screw is attracted to the male screw, the bit is locked in the slot of the male screw head, and the bit is moved and positioned near the upper position of the female screw, and then the electric screwdriver support rod is lowered to hold the intermediate portion. The male thread is released and held hanging in a free state while making contact with the chamfered part of the female thread, and at the same time restricts further descent of the electric screwdriver support rod, which is caused by the contact between the chamfered part of the female thread and the male thread. A method for manufacturing a magnetic head, characterized in that the male screw is moved onto the axis of the female screw via the elastic member by a horizontal contact force, and in this state, the bit is rotated to tighten the screw. 2. In order to assemble the magnetic head assembly by fixing the load supporting spring part to the female screw having a tapered chamfered part of the head arm with a small diameter and short length male screw, in a magnetic head manufacturing device, the bit rotated by the motor is attached to an elastic member. an electric screwdriver that is housed and held inside via the electric screwdriver; a flexible and elongated electric screwdriver support rod that suspends and supports the electric screwdriver at the lower end and releasably holds the intermediate portion on the fixed side; and the electric screwdriver support rod. A screwdriver consisting of a vertical holding plate connected to the upper end and slidably supported on the fixed side so as to be able to move up and down, and a stopper member connected to the vertical holding plate to limit its lowering position. an assembly section, a moving means for moving the electric screwdriver near a position above the female screw of the head arm, and a conveying means for conveying and positioning the assembled head arm and load support spring section to a predetermined position before tightening the screws. A magnetic head manufacturing apparatus comprising: a supply means for supplying the male screw to the electric driver; and a control section for controlling operations of each control section.