JPS59187403A - Cut-machining unit of lead face - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the cut-machining precision by eliminating the occurrence of a stick slip phenomenon during the sliding of a slide block and further correcting the abrasion of a slide face. CONSTITUTION:A rotor 59 is inserted between a moving guide block 58 and a fixed guide block 57. Either the block 58 or the block 57 is constituted so as to be adjustable by pressure against the rotor 59. A slide block 9 is slided on the block 57 while pressing the rotor, thereby the sliding is made smooth and the occurrence of a stick slip phenomenon during the sliding can be prevented. Furthermore, the positioning of a cutting tool can be correctly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The industrial application field of the invention is a cutting unit for a lead surface having a cam curve, specifically a helical cam such as that used in the recording/reproducing part of a cassette video recorder. The present invention provides a cutting unit suitable for cutting the lead surface of a cylinder having a curved lead surface.

Conventional Structure and Problems An example of a component having a lead surface on a cylindrical surface as shown in FIG. 1 is a cylinder for recording and reproducing in a household cassette video recorder (helical video table recorder). This cylinder consists of a fixed cylinder (1) having a cam curve as shown in the developed view of Fig. 2, and a rotary cylinder (2) which is rotatably installed coaxially with the fixed cylinder (1) and has a built-in magnetic head. ), and a magnetic tape (
3) runs gently on the cylindrical surface (5) along the lead surface (4) of the fixed cylinder (1). Rotating cylinder (2)
rotates at a speed of several meters per second, and the magnetic head scans at that relative speed to spread the video signal onto a track (A) with a width of about 20 μm.
Record in l). Furthermore, when reproducing a screen, the magnetic head is required to rescan the same recorded magnetic track within an error of 2 to 3 mm. Since magnetic tape is a soft polymer tape coated with magnetic material, the lead surface (4) of the fixed cylinder (1), which is the tape guide surface, must be smooth and non-magnetic. The fixed cylinder is made of aluminum alloy and has a thickness of 2 to 3μ.
Manufactured by smooth cutting with a precision of m.

Conventionally, for the cutting of articles with such IJ-shaped surfaces, it has been common to use general-purpose machines such as lathes and milling machines, or to use specialized machines such as cam forming machines.7D) With conventional processing machines, it is extremely difficult to cut articles having lead surfaces with high precision and efficiency. In addition, an end 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 producing articles having a lead surface (4) as shown in FIG. 1 are also known.

However, the known machining unit (6) connects the movement of the lead cam to the cutting tool (8) via a round cylinder (7), as shown in FIGS. The serrations 00 are designed to guide the linear motion of the slide block (9) while transmitting the same information to the slide block (9) which moves in parallel. However, in the above configuration, in order to slide the slide block (9) smoothly, a certain amount of clearance is required at the serration portion CI (j), and the presence of this clearance may cause the cutting tool to be This makes it difficult to position accurately.Moreover, since the serrations aO are surface contact types, the frictional resistance during sliding is large, and the so-called stick-slip phenomenon is likely to occur, making it difficult to always obtain smooth sliding. This is also a factor in reducing the degree of sludge.Also, there is no adjustment means for reducing the gap in the serrations αO, which has become large due to wear due to repeated sliding during long-term use, and the above-mentioned gap This occurs not only in the vertical direction (△Z) but also in the horizontal direction (△X), which is the cutting direction of the cutting tool, which not only has the disadvantage of further decreasing the positioning accuracy of the cutting tool. Since the cylinder for reciprocating the slide block (9) has a circular cross-sectional shape, it is easy to rotate.
A lead 1j as shown in FIG.
It is extremely difficult to cut an article having an ri (4) and a cylindrical surface (5) with high precision and a high H ratio.

OBJECTS OF THE INVENTION The present invention improves the drawbacks of the above-mentioned conventional processing units for processing articles having a lead surface, eliminates the occurrence of stick slip phenomenon when the slide block slides, and eliminates the occurrence of the stick slip phenomenon when sliding the slide block. The purpose of this invention is to provide a cutting unit with a function of correcting surface wear and preventing a decrease in accuracy.

Structure of the Invention The present invention comprises a cylinder that abuts via a roller a lead cam that is attached to rotate together with a spindle of a main shaft portion that grips and rotates a workpiece, and is reciprocated in a 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 having at least a vertical direction for regulating the reciprocating motion of the cylinder. a fixed block having a fixed block, a fixed guide block having a guide surface attached to the fixed block and regulating movement of the slide block, and a movable guide block having a surface attached to the slide block and facing the guide surface of the guide block. A rolling element is interposed between the movable guide block and the rotary guide block so that either the movable guide block or the fixed guide block can be suppressed and adjusted toward the rolling element. This is what happens.

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 shows a lead surface cutting unit (6) according to the present invention.
) is a plan view of a processing machine H equipped with.

(2) and 03 show a hydraulic unit and a control device as auxiliary equipment, and FIGS. 7 and 8 show a front view and a side view of the processing machine.

In FIGS. 6 to 8, a lead cam θQ and a chuck 07) are attached to the spindle of the main shaft portion Q41, and a chuck u71i and a broken object f'Jll 08) are clamped therein. The spindle α39 is connected to a main shaft motor c21 fixed to the frame (4) from the bracket 0.
It is rotated from the coupling 4, through the pulley, the belt (to) and the pulley □□□. The cutting unit (6) according to the present invention has a slide table section (6) consisting of an X slide table arm that can be moved forward and backward via a plate (C) and a Y slide table (C) that is movable in the left and right direction. 2) It is installed on top.

This slide table part (c) is equipped with an input shaft (to) that is driven from a camshaft motor fixed to a bracket (7) through a pulley 64, a timing belt, and a boot IJ c=. It is attached to the output shaft σθ of the machine (g), and its movement is controlled by the ) is rotated, levers 9Q and (6)
is rotated through an angle, so that the X slide table (c) and the Y slide table (2) are each moved by a desired amount. And the encoder (c) is attached to the above output shaft (b).
is connected, and the rotational position of the output shaft (71 is detected and its pulse signal is sent to the control device (Raku).The hydraulic unit (6), which is the hydraulic pressure supply source, is connected to the lead cutting unit (6) and slide The control device (2) is for supplying hydraulic oil to the table canopy, and the control device (2) is connected to the hydraulic unit (2).
2) and the IJ-do cutting unit (6), the entire apparatus is controlled based on the signal from the encoder (6). To specifically explain the structure of the lead cutting unit (6), the lead cutting unit (6) is fixed on the plate (c) as shown in FIGS. 10 to 12. The under block O1) and the upper block 04) ζ are slidably fitted and held together, and the cylinder is equipped with a roller and its support pin at its tip, which abuts on the lead cam 0Q attached to the spindle. (hereinafter referred to as the first piston 0η), and the first piston 1 inside the first piston θ
7) and a second piston coaxially and slidably fitted together. The first piston θ has a rectangular cross-sectional outer shape, and the rod (5 +'l
), so that the first piston η is always pressed toward the lead cam 1ll-N. Further, the first piston II') forms an AI+pressure cylinder for sliding the second piston (7), and the second piston II') forms an AI+pressure cylinder for sliding the second piston (7).
c) is moved by hydraulic action, which will be described later. The second piston (I8F blade has the slide block (9) described above)
The base of the slide block (9) is held by the screw (51), the pusher 0 seconds, and the disc spring (4i).

Further, the second screw 1-θ barrel is fitted inside the second piston with a threaded rod inserted from the end of the first piston (4θ), and is screwed into the screw part of the threaded rod. Sliding movement φ7.5 is regulated by a stop block wheel, and more preferably movement in the X direction is regulated by an adjustable stopper which extends from the end of the first piston (4 s). It looks like this.

In addition, a step is formed on the upper part of the above-mentioned underflock (11), and 6 fixing force id blocks having a guide surface extending in the cylinder sliding direction on the horizontal surface are taken out, and on the other hand, the above-mentioned slide block (9) ) is attached with a movable guide block trowel having a surface opposite to the kite surface of the fixed guide block 671, and a rolling element is interposed between the movable block and the fixed guide block 67), and the sliding A plate (9a) attached to the end of the block (9) 1 is used to press the moving guide block against the six rolling elements using screws (9b). Preferably, the second rolling element (9) is elastically deformable, and one of the above-mentioned one is slightly deformed by the suppressing action of the slide block (9) and the first one. It is possible to absorb processing errors or assembly errors of each part that would affect the movement accuracy in the sliding direction of the cylinder consisting of the piston θ force and the second piston.

■ in the diagram indicates upper block θ and lower block 0]
) is a positioning fixing bolt.

Next, we will discuss the operation procedure of the second piston of the lead cutting unit (6) mentioned above.
When the hydraulic pressure supplied from the pump ... passes through the open valve stem υ and the curved valve stem and is sent to the friJ chamber Q of the first piston holder D, the second piston (goods) is moved against the first piston θ force. It moves in a direction away from the main shaft portion 04) and is stopped by coming into contact with the stop pin qν. The movement speed at this time is determined by the aperture (64a). Next, selector valve (6j
) and forcefully sends the oil from the first piston to the rear chamber of the first piston η, the second piston θ moves to the first piston W7J.
The main shaft portion 04) moves in the direction approaching the main shaft portion 04), and is stopped when it comes into contact with the stop block (2) positioned by the aforementioned screw. The moving speed of the second piston (goods) at this time is determined by the throttle (64b), and thus the second piston (goods) is reciprocated independently of the first piston 171 while being supported by the first piston q. Ru.

Next, the above-mentioned lead cutting unit (6)
To explain the operation procedure for cutting an article having a lead curve as shown in the figure, in Figs. After that, remove the plate (a) of the slide table part (4).
The cutting unit (6) installed above is moved by rotating and sweeping the X cam (C) and Y cam (To) to move the X slide table (A) and Y slide table,
Set it in a position where the roller of the piston @ comes into contact with the lead cam αQ. At this time, slide block (9
) One cutting tool (2) of the two attached cutting tools (1) - is cutter than the other cutting tool (0).
It is located close to the axis of rotation of the barrel, and hydraulic pressure is supplied to the front chamber Q of the first piston O7I, and the second piston O7I maintains the state in contact with the stop pin (4). When the spindle (G) is rotated in this state, the lead cam (I) is rotated.
Q and the workpiece rotate together, and the force of the first piston, which is in elastic contact with the lead cam via a roller, reciprocates, and the force of the first piston, which is located within the first piston θη, rotates. The two pistons also reciprocate together, causing the cutting tool 67) attached to the slide block (9) to reciprocate. Next, operate the X slide table (c) to move the cutting unit (6) to give a cut to the cutting 111J tool, and the setting program of the control device 03 is switched to the rear chamber. - When hydraulic pressure is applied to I'L, the second piston) is not reciprocated together with the first piston -η, but moves relative to the first piston It4'l) to the spindle αQ side, and the cutting tool Thus, the cutting of the cylindrical surface (5) of the lead article shown in FIG. 1 is achieved.

Subsequently, when the second piston 13) moves relative to the first piston Oη in the direction opposite to the arrow X direction in FIG. 10 and comes into contact with the stop block ■, Y'F' JJ-,
Move the cutting tool β force away from the workpiece by moving the X slide table ( ) moves in the direction of arrow
The digit is set to 16. After that, if the Y-slide tip is moved forward, the end face of the cutting tool... or the lead will come out.
(4), and thereafter, the second piston and slide block (9) are reciprocated together with the first piston 971 from the lead cam QQi to process the lead surface (4).

” The processing unit according to the present invention shown in the embodiment number 1 (
6) The cross-sectional outline of the first piston η is rectangular, and the sliding surface is easy to finish, so extremely high-precision reciprocating sliding can be obtained, and the two cutting tools @ It has the advantage that the load bearing capacity against the moment due to resistance is far superior to the case where the cross section is circular.

Since it slides in contact with the block 6η, smooth reciprocating motion is always achieved with low friction.

In the embodiment, a second piston decoy is provided inside the first piston θ to move the slide block (9) relative to the first piston 171, that is, the cylinder. However, there is no particular limitation on the means for moving the slide block (9) relative to the cylinder.

In addition, the fixed guide block 670 is placed inside a + 1i i on the sliding cylinder, and the kite block (c) is placed on the outside (16), and the constant force block 6 is placed on the outside. , it goes without saying that the moving guide block may be disposed inside (-).

Effects of the Invention As detailed above, the present invention 1. This cutting unit (6) for the lead surface is applied to the lead cam αQ, which is mounted on a spindle so as to rotate by +C together with the spindle (15) of the main shaft part σ4) that holds and rotates the workpiece side, through a roller ■. The first binuton 17) is in contact with the lead cam iQ and reciprocated in the horizontal direction by the rotation of the lead cam iQ, and the first piston 07) is reciprocated by holding the cutting tool L@- at a predetermined interval. while the slide block (9) is movable relative to the first piston, and the two screws and the two screws that transmit the force for moving the slide block (()). and the reciprocating side of the first piston θ force,
a constant underblock l1l) having a guide surface with at least a vertical surface bounding a rectangle;
η of a fixed guide block attached to the +61 constant underblock (11) and having a guide surface for regulating the movement of the slide block (9); and a kite surface of the fixed guide block 6η attached to the slide block (9) I. A rolling element E (J) is interposed between the movable guide block (4) and the fixed guide block 67), and the movable guide block is fixed or fixed. Since either one of the guide block guides is configured to be able to adjust the suppression toward the rolling element (59), the slide block (9) is configured to suppress the rolling element EGi in its guide block (67). It slides in a state close to contact or line contact, so the sliding becomes smooth and the stick-slip phenomenon occurs during sliding a+.Furthermore, since the frictional resistance is small, there is little deterioration in accuracy, and it is easy to use during machining operations. The positioning of the cutting tool can be carried out extremely accurately, and the machining accuracy and assembly accuracy of each part can be reduced by adjusting the pressing force on the rolling elements 69.
111 High precision processing unit that can absorb 8
- It's easy to get answers. On top of that, the cylinder, i.e.
Histone 6yt i;z li′J1 constant underblock αυ vertical direction) Since it moves while being regulated along the y-id direction, it is a cutting tool! ! It is difficult to rotate due to the cutting load of 1 Noda, and it is necessary to strongly support the cutting face surface and reciprocate the slide "flock (())" from 7I (as a result, the lead cam ( 1 (If p has a high M degree, the cutting tool force □□□ will move faithfully to the shape accuracy of the lead cam α (p), and the saw 1-surface (4) and cylindrical surface (5) will be moved to a high JM degree. The hard-bore finish can be processed and can achieve a number of practical benefits, such as the ability to efficiently produce articles with lead surfaces of 'A < tEi+ quality that require skill.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an article having a lead surface, Fig. 2 is a developed view of a fixed cylinder of a video recorder, and Fig. 3 is a normal view of a conventional notebook surface cutting unit. Fig. n, Fig. 4 is a cross-sectional view of the \-\' light door in Fig. 3, Fig. 5 is an enlarged view of the section a of Fig. 4, Fig. 6
Figures 12 to 12 show the first warping of "Unexploded 19", and Figure 6 is a bottom view of the lead surface cutting machine, and Figure
7. Figure 8 is a front view of the J section FOr surface of the cutting machine ≧5
and 1.0 is a side view of a curved surface, FIG. 9 is a plan view of the slide table portion of the cutting machine, FIG. 1.0 is a partial cross-sectional front view of the cutting unit of the present invention, and FIGS. 1st
There is 0 figure 1. (4) is the lead surface, (6) is the 1st and 11th cutting unit,
(9) is a slide block, υ is a fixed underflock, (14i is a main shaft part, ut is a spindle, uQ is a lead cam, (18) is a cut piece, a sail is a fixed upper block, 2) is a roller, 07 is a 1st piston (shilling)
←? ) is a fixed kite block, the branch is a moving kite block, 6q is a rolling element, and @ is a cutting tool. Patent applicant's agent Figure 7 Figure 2 Figure 3 18-

Claims (1)

[Claims] 1) The blade is attached so as to rotate together with the spindle of the soil shaft part that grips and rotates the workpiece, and comes into contact with a t-shaped lead cam via a roller, and reciprocates in the horizontal direction by the rotation of the lead cam. a slide cylinder that holds a cutting tool and is capable of reciprocating the cylinder (while being moved therewith, it can be moved two times in irregular rows with respect to the cylinder number); a fixed block having a guide surface with at least a vertical surface that regulates the reciprocating movement of its own cylinder; a fixed guide block that is attached to the fixed block and has a guide surface that regulates the movement of the slide block; The slide block f is attached to a movable guide block having a surface facing the guide surface of the second guide block, and a rolling element is interposed between the movable guide block and the fixed guide block. A lead surface cutting unit characterized in that the movable kite block or the fixed guide block is configured to suppress harmonics toward the rolling element. 2) A cross section of the cylinder. The lead surface cutting unit according to claim 1, which has a rectangular outer shape.