JP2683153B2 - Chamfering method for component mounting surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a chamfering method of a component mounting surface, and more particularly to a chamfering method of a mounting surface of a head, for example, for heightening a VTR head.

[Prior art]

Conventionally, for example, when assembling the VTR head to the upper drum,
A head washer was selected for each head, installed, and fine adjustment of the relative height of the head was performed in units of 1 μm.
FIG. 2 shows an assembling process according to the related art.
The VTR head 2b is pre-mounted on the head holding part 2a. When the head assembly 2 is assembled to the upper drum 12, the head washers 13 are selected for each head so that the drum 12 and the head 2b have a predetermined positional relationship.

[Problems to be solved by the invention]

However, since the VTR head has a different head height for each head, it takes time and labor to select the head washers 13 for each VTR head 2. Also, VTR
After mounting the head assembly 2 on the upper drum 12, set the relative height of the VTR heads on the upper drum to 1
Bending adjustment must be done so that it falls within the μm range. Conventionally, the above two points of selection and adjustment processes are required,
The drawback was that it took a considerable amount of time to assemble. Incidentally, such a problem is not limited to the above-mentioned VTR head, and inevitably occurs in the manufacture of an assembly composed of three parts that require precise alignment. Therefore, an object of the present invention is to attach the second component having the first component to the third component at a predetermined mounting surface provided on the second component so that the first component is Three
Is a machining method for chamfering the predetermined mounting surface with a predetermined cutting tool so as to have a predetermined positional relationship with respect to the parts described in (1), even if there is no adjustment member such as a conventional washer. The present invention proposes a method for chamfering a component mounting surface that enables a component to be precisely mounted on a third component.

[Means for Solving the Problems]

The chamfering processing method of the component mounting surface of the present invention for achieving the above-mentioned object is: (a) a step of detecting an offset amount of the cutting edge of the cutting tool with respect to the origin of the image space; Based on the offset amount and the positional relationship between the first and third parts, the first and second parts are integrally formed so that the predetermined mounting surface is formed on the second part. And a step of moving with respect to the origin of the image space.

[Action]

In step (a), the origin of the cutting tool with respect to the image space is determined. In the step (b), the origins of the first and second parts with respect to the image space are set and the first part is moved so as to have a predetermined positional relationship with the third part.

【Example】

An embodiment in which the present invention is applied to machining a mounting surface of a VTR head will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the overall configuration of the processing apparatus 100 of the embodiment. A head assembly (assembly of head 2b and head holding member 2a) 2 to be processed is held by a jig 4 and fixedly placed on an XYZ stage. The jig 4 is moved in the vertical direction by the Z ₁ direction fine movement stage 5, and is also moved in the XY direction by the XY stage 6. The cutting tool 1 is rotated by a motor 7 to cut a mounting surface of a head assembly to a drum (not shown). In this embodiment, the motor 7 is fixed. Therefore, in order to form the mounting surface of the head 2, the XY stage 6 is moved in the X direction. FIG. 3 shows the positional relationship between the head 2 and the drum 12.
In the VTR head, the head 2b is
If is not in place, normal tracking becomes impossible. This positional relationship is represented by the fact that the distance of the mounting surface 15 to the head 2b is α. Head holding member 2a
On the other hand, since it is difficult to mount the head 2b with high precision, conventionally, a washer for adjustment is provided on the mounting surface as described above. In this embodiment, the accurate positional relationship between the head 2b and the drum 12 is achieved by forming (by cutting) the mounting surface 15 at a distance α from the head 2b. However, as is clear from FIG. 3, the mounting surface is located at a distance α from the head 2b.
In order to form 15 by cutting, the positional relationship between the cutting edge of the cutting tool 1 and the head 2b must be accurate. However, in the cutting process, it is necessary to fix the head 2 with a jig or the like, but the positional relationship between the jig 4 and the head 2b cannot be specified, so that the above positional relationship cannot be realized. Therefore, in this embodiment, the absolute position of the cutting edge of the jig 4 and the absolute position of the head 2b are obtained by image processing, and the mutual positional relationship is expressed by these absolute positions. ing. The absolute position can be grasped as a displacement amount of the obtained image with respect to the origin of the image space. Returning to FIG. 1, the description of the configuration of the apparatus of this embodiment will be continued.
The camera 11 is a means for capturing an image for obtaining the above-mentioned absolute position value (that is, the amount of deviation with respect to the origin of the image space).
That is, this image pickup means includes a light source 10 and an autofocus mechanism 9, and an image captured by the lens 3 is converted by the camera 11 into a digital image signal. The image pickup means is fixed to the fixed base 16. The pedestal 16 is moved in the Z ₂ direction by the Z ₂ direction stage 8. The image signal obtained by the camera 11 is subjected to image processing by the image processing device, and the image processing result is sent to the arithmetic processing device. The arithmetic processing unit measures the cutting edge of the tool 1, the position of the head 2b, etc., and controls the tool 1 so as to form a mounting surface 15 as shown in FIG. The arithmetic processing unit controls the motor 7, the X stage 6, the Z ₁ stage 5 and the Z ₂ stage 8. In this embodiment, as described with reference to FIG. 3, the distance α between the head 2b and the mounting surface 15 is a problem. That is, the mounting surface 15 at this distance α is formed by controlling the Z ₁ stage 5. Therefore, from this point of view, that is, in the system of FIG. 1, the movement of the X-direction stage is an operation for the tool 1 to delete the head example member 2a. FIG. 4 is a flow chart showing the operating procedure by the apparatus 100 of FIG. Steps S2 to S8 are steps for detecting the position of the cutting edge of the tool 1. In the system of FIG. 1, the Z direction of the tool 1 is unchanged. Therefore, the cutting edge position of the tool 1 is defined as the deviation amount β with respect to the origin of the image space of the image processing apparatus, as shown in FIG. This β can be obtained by capturing an image of the tool 1 and performing image processing (for example, binarization processing, labeling processing, pattern matching processing) on the image, but for the purpose of further improving accuracy,
In the system of this embodiment, as shown in FIG. 5, the dummy head is fixed to the jig 4 (step S2 in FIG. 4), the dummy head is cut (cement S4) with the tool 1, and the image of the cut surface is captured ( Step S6) Yes. Then, as shown in FIG. 6, the image of the cutting surface is subjected to image processing to calculate the deviation amount β with respect to the origin of the cutting surface (step S8 in FIG. 4). Steps S10 to S18 in FIG. 4 indicate the steps of forming the mounting surface 15 on the head holding member 2a for each work head 2. In step S10, the head 2 as a work is fixed to the jig 4. The state is shown in FIG. 7A. In this state, the position of the tool 1 with respect to the image system is recognized, but the position of the work head 2 with respect to the image system is unknown. Therefore, in step S12, the head 2b position is matched with the image origin 0 while finely adjusting the position of the jig 4 while moving the Z ₁ stage. In this operation, while capturing the image of the head 2b with the camera 11, the image processing is performed on the image to recognize the position of the head 2b, and at the same time, the arithmetic processing unit sets the Z ₁ stage so that the head 2b coincides with the origin 0. 5 may be drive-controlled. By the above operation, as shown in FIG. 7B, the origin of the image system of the head 2 can be set. Next, in step S14, the Z ₁ -axis motor, that is, the head 2 is
Further move from the current position by α-β. Then, as shown in FIG. 7C, the cutting edge of the tool 1 coincides with the mounting surface 15. Then, X in step S16
The stage 6 is moved to cut the head holding member 2a with the tool 1. As a result, the hatched portion in FIG. 7C is cut and the mounting surface 15 is formed at the position α from the head 2b. The present invention can be variously modified without departing from the gist thereof. The modification will be described below. In the above embodiment, as shown in FIGS. 7A to 7C, the head 2 is moved to the origin by moving the head 2 in the Z ₁ direction at step S12 while fixing the image system.
After that, the head 2 was moved by α-β. The modification described below is, as shown in FIGS. 8A to 8C, Z ₂
By driving the stage, the image system (ie camera 1
1) is moved by α-β to move the origin of the image system from 0 to 0 '(8B
Figure) Then, as shown in FIG. 8C, the head 2b is aligned with the new origin and the origin of the head 2 is set. The modification of FIG. 8 is effective when the movable distance of the Z ₁ stage 5 is short. Further, the following modified examples are also proposed. In the above-described embodiment, the operation of step S12 is automatically performed by the arithmetic processing device by pattern recognition, but it may be modified as follows. That is, a monitor is added to the system shown in FIG. 1, a head image is displayed on the monitor, and the operator
The Z ₁ stage 5 is controlled to change the head 2b so that it matches the origin 0. Furthermore, the present invention is not limitedly applied to the manufacture of VTR heads. INDUSTRIAL APPLICABILITY The present invention can be generally applied to the manufacturing process of an assembly consisting of three parts that require precise alignment. According to the processing apparatus according to the above-described embodiments and modifications, when the VTR head 2 is attached to the upper drum 12, the head washer is eliminated, and the operation for height adjustment is significantly reduced. That is, specifically, the effect of abolishing the head washers and the head washer screening step can be expected. Further, since the height can be determined for each cutting of 1 μm, if the height does not change even if the head 2 is screwed directly to the drum 12, the height adjusting process itself can be substantially abolished.

【The invention's effect】

As described above, according to the chamfering processing method for the component mounting surface of the present invention, the assembly for accurately mounting the first component to the third component via the second component can adjust the conventional washer or the like. It was possible without the need for anything, simply by forming the mounting surface on the second part.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the whole processing apparatus of a preferred embodiment of the present invention, FIG. 2 is a view for explaining a conventional VTR head assembly assembly process, and FIG. FIG. 4 is a diagram for explaining the reason why the head 2b needs to be precisely positioned with respect to the mounting surface 15, FIG. 4 is a flow chart for explaining the operation procedure of the above embodiment, and FIGS. FIGS. 7A to 7C are views for explaining the principle of origin finding of the tool in the embodiment system shown in the drawings, and FIGS. 7A to 7C specifically show the positional relationship of the head 2 etc. when the operation procedure of the flow chart of FIG. 4 is followed. 8A to 8C are views specifically showing the positional relationship of the head 2 and the like when the operation procedure of the modified example is followed. In the figure, 1 ... Tool, 2 ... VTR head, 3 ... Lens,
4 ... Jig, 5 ... Z _1- direction fine movement stage, 6 ... X-direction moving stage, 7 ... Spindle motor, 8 ... Z _2- direction moving stage, 9 ... Autofocus mechanism, 10 ... Light source ,
11 ... Camera, 12 ... Upper drum, 13 ... Head wash, 14 ... Screw.

Claims (5)

(57) [Claims] 1. A second part having a first part and a second part
In order to attach the first component to the third component at a predetermined attachment surface provided on the first component, the first attachment surface is configured to have a predetermined positional relationship with respect to the third component. A machining method for chamfering with a cutting tool, comprising: (a): detecting an offset amount of a cutting edge of the cutting tool with respect to an origin of an image space; (b): the cutting edge having the predetermined mounting surface. So as to be formed on the second component, the first and second components are integrated into the origin of the image space based on the offset amount and the positional relationship between the first and third components. And a step of moving the parts relative to each other. 2. The step (a) includes: (a-1): cutting a dummy part of the second part with the cutting tool, and (a-2): capturing an image of the cut surface. Step and (a-3): From the image of the cutting surface, the cutting edge position β of the tool
The method for chamfering a component mounting surface according to claim 1, further comprising the step of identifying in the image space. 3. When the predetermined mounting surface is required to be displaced from the first component by a distance α, the step (b) includes (b-1): the first step. A step of integrally moving the first and second parts so that the position of the first part coincides with the origin while identifying the first and second parts in the image space based on the image of the part. And (b-2): the step of moving the first and second parts integrally by α-β.
Chamfering method of the component mounting surface according to the item. 4. When the predetermined mounting surface is required to be offset from the first component by a distance α, the step (b) includes (b-1): obtaining the image. An optical system for moving the origin of the image space by α-β, and (b-2): based on the image of the first component obtained based on the shifted optical system. Moving the first and second parts so that the position of the first part coincides with the origin while identifying the first and second parts in the image space. A method for chamfering a component mounting surface according to claim 2. 5. The component according to claim 1, wherein the first component is a magnetic head for a VTR, the second component is a head holding component, and the third component is a rotary drum. Chamfering method for mounting surface.