JPS59187402A - Cut-machining unit of lead face - Google Patents

Abstract

PURPOSE:To finish and machine a lead face and a cylindrical face with high precision by shifting cutting tools faithfully following the profile precision of a lead cam. CONSTITUTION:The guide face of a fixed under-block 11 is formed with a vertical face and a horizontal face extending in the moving direction of a slide block 9. A concave section or a convex section sliding on the vertical face of the guide face is provided on part of the block 9, and the block 9 is slided along the vertical guide face of the block 11. Therefore, an effect of the vertical displacement component of the block 9 scarcely appears, and the positioning precision of cutting tools 67, 68 fitted to the block 9 against a cut work 18 can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a unit for cutting a lead surface having a cam curve, and more specifically, to cutting a lead surface having a helical cam curve as used in the recording/playback part of a cassette video recorder. The present invention relates to a cutting unit suitable for cutting the lead surface of a cylinder having a lead surface.

Structure of the conventional example and its problems An example of a component having six lead surfaces on a cylindrical surface as shown in Fig. 1 is the cylinder for recording and reproducing in a home cassette video recorder (helical video tape recorder) I. Can be mentioned. This cylinder consists of a fixed cylinder (1) having a cam curve as shown in the developed view of Fig. 2, and a rotating cylinder (2) which is rotatably installed on the same axis as the fixed cylinder (11) and has a built-in magnetic head. The magnetic tape "3" runs gently on the cylindrical surface (5) along the lead surface (4) of the fixed cylinder (1) while straddling both cylinders (11 (2+).
2] rotates at a speed of several meters per second, and a magnetic head scans at that relative speed to record a video signal in a track (A1) with a width of about 20 Am. Furthermore, when reproducing a screen, the magnetic head is required to rescan the same recorded magnetic track within an error of 2 to 3 x m. Since magnetic tape is a soft polymer tape coated with a magnetic material, the fixed cylinder (11 lead surface (4)) that serves as the tape guide surface must be smooth and non-magnetic. Aluminum alloy is used for the fixed cylinder.
Manufactured by smooth cutting with a precision of mm.

Conventionally, cutting of articles with such lead surfaces involves
Generally speaking, it is preferable to use a general-purpose machine such as a lathe or milling machine, or a dedicated machine such as a cam forming machine.
''/It is extremely difficult to efficiently cut a single item as described above with high precision.

In addition, a cutting surface cam (hereinafter referred to as lead cam) with a lifting height equivalent to the lead curve required for the main shaft that rotates the workpiece is installed, and the cutting tool is reciprocated along this lead cam. Processing units for detonating articles having lead surfaces (4) as shown in the figures are also known.

However, the known machining unit (6), as shown in front and cross-sectional views in FIGS. The linear movement of the moving slide block (9) is guided by the serration section OG while being guided by the serration section OG. However, in this guiding method, the guiding accuracy is limited to the serration section αO. The precision of repeated sliding of the slide block (9) determines the cutting finish precision of the lead surface (4).Furthermore, since the cylinder (7) is round, it cannot rotate. The slide block (9) is easily affected by this, making it difficult to obtain a high degree of positioning accuracy.More specifically, the sliding movement of the serration portion aO is caused by multiple The average clearance between the convex part and the concave part is reflected in the accuracy, and if you try to obtain smooth sliding, the accuracy will inevitably decrease.Also, as shown in Figure 5, the guide Slider block (9
) is processed, but it is extremely difficult to finish the serration part 00 with high accuracy by controlling the dimensions on the micron order, and furthermore, a gap was created in the serration part αO due to thick wear due to repeated sliding. If the gap is vertical (△Z direction) and horizontal (△X direction)
Since it is impossible to treat the two separately, there is a problem in that it is extremely difficult to correct and control the sliding accuracy when it deteriorates.

OBJECT OF THE INVENTION The present invention aims to provide a processing unit capable of cutting an article having a lead surface (4) as shown in FIG. In a machining unit equipped with a block, gaps generated by repeated sliding of a slide block can be separated vertically and horizontally, and a machining unit is obtained in which the influence of the vertical gap does not affect the horizontal direction. This is the purpose.

Structure of the Invention The present invention comprises a cylinder which is attached to rotate together with a spindle of a main shaft portion that grips and rotates a workpiece, and which is in contact with a lead cam via a roller and reciprocated in the horizontal direction by the rotation of the lead cam. , a slide block that holds a cutting tool and is movable relative to the cylinder while being moved by the reciprocating motion of the cylinder, and a guide surface for guiding the movement of the cylinder and the slide block. a fixed block, the guide surface of the fixed block is formed by vertical and horizontal surfaces extending in the moving direction of the slide block, and a part of the slide block has a sliding surface on the vertical surface of the guide surface. A contacting convex or concave portion is provided so that the slide block slides along a vertical guide surface of the fixed block.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained in detail based on FIGS. 6 to 12, which show embodiments of the present invention.

Figure 6 d Cutting unit for lead surface according to the present invention (6
) is a plan view of a processing machine (U) equipped with (6) and 0
3 shows a hydraulic unit and a control device as ancillary equipment, and FIGS. 7 and 8 show a front view and a side view of the processing machine.

6 to 8, a lead cam OQ and a chuck q are attached to the spindle OQl of the main shaft portion 04), and a workpiece 08) is held by the chuck αη.

The spindle OG is connected from the main shaft motor 3υ fixed to the frame (7) through the bracket QQl, the cup link (a), the boolean IJi, the belt (c), and the pulley IJ (b).
It is rotated through . Cutting unit (6) according to the present invention
) is an X that is movable in the front and back direction via the plate
It is mounted on a slide table part (a) consisting of a slide table (goods) and a Y slide table (d) that is movable in the left and right direction.

This slide table part is connected to a reducer (d) equipped with an input shaft (d) which is driven from a camshaft motor 6υ fixed to a bracket, via a pulley (6), a timing belt, and a pulley (b). The movement is controlled by the X cam trowel and Y cam H cylindrical mounted on the output shaft (9), and when the X cam trowel and Y cam (G) are rotated as shown in Fig. (2) and 41) are rotated through angles so that the X slide table and the Y slide table are respectively moved by desired amounts. The encoder 0a is connected to the output shaft (b) above, and the output shaft (b)
The rotational position of is detected and the corresponding pulse signal is sent to the control device Q. In addition, the hydraulic unit 02, which is the hydraulic pressure supply source,
Lead cutting unit (6 parts and slide table part)
The control device σ East controls the entire device including the hydraulic unit a7J and the O-lead cutting unit (6) based on the signal of the encoder θ. It is something to do. Next, to specifically explain the structure of the lead cutting unit (6), the lead cutting unit (6) is shown in FIGS. 10 to 12 ζ
As shown here. The under block 0]) and the upper block (
A cylinder (hereinafter referred to as the first piston (47)) equipped with a supporting pin at its tip is a roller which is slidably fitted and held in the cylinder 1-11 and comes into contact with the lead cam GQ attached to the spindle. ) and a second piston (f) coaxially and slidably fitted with the first piston α inside the piston α. The younger piston 1 has a rectangular cross-sectional outer shape. , and the rod is energized by the compression spring installed in the underblock Uυ (5+ノ)
, so that the first piston 17
1 is constantly being suppressed toward the lead cam σQ. The nine pistons (9) form a hydraulic cylinder that moves the second piston (9), and the two pistons (9) are moved by the i'lfJEt action, which will be described later. The slide block mentioned above (
9) no, i;' part or food passage, Nejii'), pusher 02l
Oyo O Sarabafue? Therefore, the slide flock (9)
It is held at the base.

Also, the second piston sail is fitted into the screw rod inserted from the end of the second piston and into the inside of the second piston, and is connected to the screw rod (b). '4 Sliding 'ff+i is regulated by the combined stop block 0, and more preferably, the adjustable spring 1 and the splint 1 inserted from the end of the first piston hole η≦ prevent movement in the incoming direction. It is becoming regulated.

” Two masters of the Slight Book Mouth (9th is the 111th Zl)
As shown schematically, create a convex groove that fits into the square groove Q57l provided in the underblock (1),
It is designed to be slid in the left and right direction with reference to the vertical direction of the groove 67).

Next, referring to the operation procedure of the second piston of the lead cutting unit (6) mentioned above, the hydraulic pressure supplied from the pump flash of the hydraulic unit @ is applied to the switching valve (6),
When the oil is fed under pressure to the front chamber ring of the first piston 0η through six oil passages, the second piston (F) moves in a direction away from the main shaft portion α mentioned above with respect to the first piston θ, and the stop pin It comes into contact with (a) and is stopped. The moving speed at this time is determined by the aperture (64a). Next, if the switching valve 6η is switched to forcefully send oil from the oil pipe to the rear chamber ring of the first piston θ, the second piston will be transferred to the first piston 47).
It moves in the direction approaching the main shaft part 04), and is stopped by coming into contact with the stop block positioned by the above-mentioned threaded rod. The second piston at this time (
The moving speed of c) is the aperture (64b). determined by i,
Thus, the second piston is supported by the first piston force and is moved back and forth independently of the first piston force.

Next, the first lead cutting unit (6) described above is used.
To explain the operation procedure for cutting an article having a lead curve as shown in the figure, in Figs. After being clamped by the chuck α force, the cutting unit (6) mounted on the plate (4) of the slide table part (4) is moved to the X cam (c).
Move the X slide table (c) and Y slide table by rotating the Y cam (e) and the fist.
Set the roller (c) of the piston 07) to a position where it contacts the lead cam αQ+. At this time, the slide block (
9) Two cutting tools attached to @? ? ? One of the cutting tools is located closer to the rotation axis of the workpiece α than the other cutting tool, and hydraulic pressure is supplied to the front chamber Q of the first piston Oη, and the second piston ( 9) remains in contact with the stop pin. When the spindle α is rotated in this state, the lead cam OQ and the workpiece (to) rotate together, and the first piston 1η, which is in elastic contact with the lead cam αQ and the roller (c), rotates together.
moves reciprocally and is located within the first piston O7l.
The 2 pistons ■ also reciprocate and slide block (9)
The attached cutting tool is reciprocated. Next, operate the Y slide table (E) to move the cutting unit (6) to give a cut to the cutting tool. When hydraulic pressure is applied, the second piston moves back and forth with the first piston @η.
The cylindrical surface (5) of the lead article shown in FIG. 1 is cut by the cutting tool (piston C7) by moving toward the spindle 09 side relative to the piston C7).

Subsequently, when the second piston moves in the direction opposite to the direction of the arrow X in Fig. 10 relative to the first piston θ and comes into contact with the stop block So, the Y slide table ) in the direction of the arrow Y in the same figure to separate the cutting tool from the workpiece Q~, and send hydraulic pressure to the oil pipe 12 by switching the switching valve O, the second piston decoy moves in the direction of the arrow X. Then, it comes into contact with the stop pin and stops, and the cutting tool branch on the lead surface is set at the position of the lead surface (4). After that, if the Y slide table (c) is moved forward, it will be located on the end face on the cutting tool side or the lead surface (4), and from then on, the lead cam QQ will move the first piston @η, the second piston (c) and the slide block ( 9) is reciprocated to process the lead surface (4).

The processing unit according to the present invention (6
The first piston (411) has a rectangular cross-sectional outer shape and its sliding surface is easy to finish, so extremely high-precision reciprocating sliding can be obtained, and the cutting of the two cutting tools It has the advantage that the moment C due to resistance is much better than the case where the cross section is circular.

In addition, in the example, there is a groove ←η on the underblock αD side.
, and a convex part (f) is provided on the slide block (9) side, or conversely, a groove may be formed on the slide block (9) side and a convex part is provided on the under block round side. Of course it's a good thing. Further, the means for moving the slide block (9) relative to the first piston θ while moving together with the first piston is not particularly limited to this. Effects of the Invention As detailed above, the present invention The cutting unit (6) for the lead surface of the C-type is a main shaft part (i41's spindle u!9) that grips and rotates the to-be-cut part (i41's spindle u!9). The first piston η, which reciprocates in the horizontal direction, and the cutting tool trowel are held at a predetermined interval by the rotation of the +A lead cam tS. A slide block (9) that is movable relative to the first piston θ7) while being moved in this way; a second piston (c) that transmits a force for moving the slide block (9); 7) at the first piston and a 161 constant under block (11) provided with a guide surface for guiding the movement of the slide block (9),
The guide surface of the fixed under block 0]) is formed by vertical and horizontal surfaces extending in the moving direction of the slide block (9), and
The slide block (9) is configured to have a convex portion or a concave portion in sliding contact with the vertical surface of the guide surface so that the slide block (9) slides along the vertical guide surface of the fixed underblock Ql). Therefore, the influence of the vertical displacement component of the slide block (9) hardly appears in the horizontal direction. The positioning viscosity for this can be improved, and the determined positional accuracy can be maintained. Furthermore, since the protrusions or four parts of the fixed underblock α that fit into the guide recesses or protrusions of the slide block (9) are formed by vertical and horizontal surfaces, manufacturing is easy. If the lead cam 00 can be manufactured with high precision, and as a result, the lead cam 00 is highly accurate, the cutting tool (@ki) will move to faithfully follow the shape accuracy of the lead cam 0Q, cutting the lead surface (4) and cylindrical surface (5) with high precision. It has many practical effects, such as being able to carry out C-finishing and efficiently producing articles with high-quality lead surfaces without requiring any skill.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an article having a lead surface, Fig. 2 is an exploded view of a directing cylinder of a video tape recorder, Fig. 3 is a front view of a conventional cutting unit for a lead surface, and Fig. 4 is a younger brother 3. Fig. 5 is an enlarged view of the serration portion in Fig. 4, Fig. 6 to Fig. 12 show examples of the present invention, and Fig. 6 shows cutting of the lead surface. A plan view of the processing machine, FIGS. 7 and 8 are a partially sectional front view and a partially sectional side view of the cutting machine, FIG. 9 is a plan view of the slide table of the cutting machine, and FIG. 10 is a diagram illustrating the present invention. A partial cross-sectional front view of the cutting unit, Figures 11 and 12 are @10
2A and 2B are cross-sectional views taken along line H-H and line G-d in FIG. 1, respectively. (4) is the lead surface, (6) is the cutting unit, (9)
is a slide block, α old fixed under block, 0
4) is the main shaft part, o5 is the spindle, αQ beam ~ docam,
(G) is the object to be cut, (C) is the roller, and η is the first piston (cylinder) @1 is the cutting tool. =10-11- -12-

Claims (1)

[Scope of Claims] 1) The lead cam is attached to rotate together with the spindle of the main shaft that grips and rotates the workpiece, or is brought into contact with a lead cam via a roller and reciprocated in the horizontal direction by the rotation of the lead cam. a cylinder, a slide block that holds a cutting tool and is movable relative to the cylinder while being moved (thereby); and a guide for guiding the movement of the cylinder and the slide block. The guide surface of the fixed block is formed by a vertical and horizontal surface I extending in the moving direction of the slide block, and a part of the slide block is formed with a surface I that extends in the vertical direction and the horizontal direction of the guide surface. A cutting unit for the lead surface, which is formed by providing a convex portion or a concave portion in sliding contact with the surface so that the slide block slides along the vertical side surface of the fixed block. 2) Cross-sectional outline of the cylinder 2. The reed cutting unit according to claim 1, wherein the reed has a rectangular shape.