JPH0432163Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The disclosed technology belongs to the field of structural technology of cutting devices for parts such as internal parts that are difficult to cut from the surface of parts used in automobile steering devices and the like.

Therefore, in this invention, an eccentric shaft, which is slidably inserted in the axial direction into an insertion hole inside a spindle that is integrally connected to a rotating device such as a belt pulley mechanism, is connected to a hydraulic cylinder or the like at its base end. This invention relates to a simple cutting device in which a slider is connected to an advancing/retracting device and has a replaceable cutting tool such as a cutting tool at its tip and is engaged in a spindle so as to be able to slide or otherwise move freely in the radial direction. In particular, a cam surface such as a tapered surface is formed at the tip of the eccentric shaft, while a cam follower surface such as a tapered surface that engages with the cam surface of the eccentric shaft is formed on the base end of the slider. This invention relates to a simple cutting device in which an elastic spring or the like is interposed between the cutting tool and the cutting tool in the radial direction, that is, the cutting tool is biased toward the processing surface of the workpiece.

<Prior Art> As is well known, various mechanical parts are combined in mechanical devices such as automobile parts, and among these mechanical parts, for example, parts used in automobile steering devices, Some products have counterbore holes, etc. formed inside them that are difficult to machine from the surface side to improve assembly accuracy, and cutting operations such as deburring the inner surface of the counterbore holes must be performed. There are certain aspects.

A device called a facing unit or a recess unit is used for grooving the inside of the seed hole, chamfering the back side, deburring, etc., but these devices have a small cutting load on the workpiece.
In addition, since highly accurate positioning is not required, simple cutting devices with relatively simple structures are used, such as those proposed in Utility Model Application Publication No. 55-129708 and Utility Model Application Publication No. 59-156708. Ideas have been devised and put into practical use.

A general aspect of such a simple cutting device, for example, a facing unit, will be briefly explained with reference to FIG. 4. The simple cutting device 1 of the facing unit has a bearing 3, a bearing 3,
A spindle 4 is rotatably supported via a spindle 3, and a pulley 5 to which power is transmitted via a belt (not shown) is integrally fixed to the base end of the spindle 4.
A slider 7 having a replaceable cutting tool 6 such as a cutting tool is provided at the tip of the spindle 4 so as to be slidable in the radial direction via a guide groove 8 .

An eccentric shaft 9 provided inside the spindle 4 is connected at its base end to a hydraulic cylinder 10 serving as an advancing/retracting device, and is movable in the axial direction.
is the pinion 1 pivotally supported at the tip of the spindle 4.
2, the pinion 12 is engaged with a rack 13 of the slider 7.

Thus, the eccentric shaft 9, the rack 11, and the pinion 12 move forward and backward by the operation of the hydraulic cylinder 10.
A predetermined stroke slider 7, that is, a cutting tool 6, is displaced in the radial direction of the spindle 4 via the slider 4 to perform cutting or deburring on a workpiece (not shown).

<Problem to be solved by the invention> Therefore, as shown in FIG. 4, the conventional simple cutting device 1 has a transfer mechanism having a pinion 12 and a rack 11 inside the spindle 4. The structure is complicated due to the presence of screws and square screws, and maintenance and maintenance of the force mechanism must be carried out periodically and irregularly, making the work cumbersome.As mentioned above, the cutting load is small; The structure is complex for a simple cutting device that does not require high-precision positioning, etc., and in order to maintain the complexity of the mechanical part and retain its functionality, the entire device must be large, making it difficult to maintain functionality. As a result, the initial cost and running cost were high, which was a disadvantage.

The purpose of this invention was to solve the technical problem of the structure of the simple cutting device based on the above-mentioned conventional technology. Costs and running costs can be reduced and kept low, and the structure is simple, robust, and durable, and it can be made compact, has little interference with surrounding equipment, and is easy to operate. The purpose of this invention is to provide an excellent simple cutting device that is useful in the field of processing technology used in the machine manufacturing industry.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claims, is based on the above-mentioned purpose. A simple cutting device in which an inserted eccentric shaft is connected to an advance/retract device and engages a slider having a cutting tool so as to be movable in the radial direction within the spindle, the eccentric shaft having a tapered tip at the tip thereof. The slider has a tapered cam follower surface that engages with the cam surface, and is biased in the radial direction toward the processing surface of the workpiece through a spring on the spindle. The cutting tool is slidably engaged with a guide groove formed at the tip of the spindle, and the cutting tool is arranged concentrically with respect to the slider.

<Operation> As a result, the eccentric shaft, which is provided inside the spindle supported by the frame via a bearing and is slidable in the axial direction, advances and retreats by a predetermined stroke by the advancing and retreating device connected at its base end. A cam surface such as a tapered surface formed at the tip of the spindle engages with a cam follower surface such as a tapered surface of a slider provided at the tip of the spindle so that it can freely slide in the radial direction, and the cam surface is interposed between the spindle and the slider. Since the slider, that is, the cutting tool, is biased radially toward the machining surface side of the workpiece by a spring such as an elastic compression spring, the slider immediately moves the spindle depending on the degree of axial movement of the eccentric shaft. radially within, thereby
A cutting tool such as a cutting tool, which is concentrically and integrally replaceable at the tip of the slider, smoothly enters the inside of the workpiece or the back side, moves laterally, and is cut by a rotating device connected to the spindle. The rotational force of the spindle is transmitted to perform cutting operations such as slotting and deburring in accordance with the design.
The slider and the eccentric shaft are engaged with each other by an extremely simple mechanism, which is highly durable, and requires no troublesome maintenance and inspection equipment.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 3. Incidentally, the same parts as those in FIG. 4 will be explained using the same reference numerals.

In the illustrated embodiment, as shown in FIG.
This is a mode of a simple cutting device 1' used for cutting and removing burrs 18 in the process, and the basic structure of the simple cutting device 1' is the same as that of the conventional mode shown in FIG. On the other hand, bearing 3,
The spindle 4', which is rotatably supported horizontally via a spindle 3, is provided with a pulley 5 as a rotating device at its base end, which engages a belt between it and a motor (not shown). There is a counterbore hole 1 in the part.
A slider 7' to which a cutting tool 6' for cutting off the burr 18 at step 7 can be attached exchangeably and concentrically is inserted in the radial direction through a guide groove 8 formed at the tip of the spindle 4. It is slidably engaged.

In this invention, the eccentric shaft 9', which is provided concentrically within the spindle 4' so as to be movable in the axial direction, is located at the rear end (the right end in the figure).
It is connected to a hydraulic cylinder 10 as an advancing/retracting device in the same way as in the conventional mode, and its tip (left end in the figure) is formed with a tapered surface 11' as a cam surface. A tapered cam follower surface 12' that engages with cam follower surface 11' is formed on the rear end surface of slider 7'.

Then, as shown in FIGS. 2 and 3, the slider 7'
In the spindle 4', an elastic spring 15 is interposed between the concave groove 14 and the spindle 4', so that the slider 7' is always moved in the radial direction of the spindle 4', that is, the workpiece 16 Pressure is applied to the machined surface side.

In the above configuration, when the simple cutting device 1' is operated, in the initial position, the hydraulic cylinder 10 is moved forward and backward so that the cutting tool 6' can be smoothly inserted into the insertion hole 19 of the workpiece 16, as shown in FIG. Then, the tapered surface 11' of the cam surface at the tip of the eccentric shaft 9' matches the cam surface 12' as the cam follower surface of the slider 7', as shown in FIG. The workpiece 16 is smoothly and relatively inserted into the insertion hole 19 and positioned.

Therefore, a motor (not shown) is operated to pull the pulley 5.
When the spindle 4' is rotated, the slider 7' rotates together with the spindle 4' through the guide groove 8, and the cutting tool 6' starts cutting the counterbore hole 17 of the workpiece 16.

In order to remove the burr 18 from the counterbore hole 17 of the workpiece 16, the hydraulic cylinder 10 is operated according to the design program to move the eccentric shaft 9' backward at a set speed to the right side in the drawing. When the slider 7' retreats in the direction of the arrow from the state shown in FIG. 2 to the state shown in FIG. The tapered surface of ' moves radially relative to the spindle 4' as far as the engagement relationship with the tapered surface 11' of the eccentric shaft 9' allows, and therefore the cutting tool 6' also moves into the counterbore hole 17. and move in the radial direction to cut the burr 18 as designed.

Therefore, the slider 7' is moved in the radial direction through the backward movement of the hydraulic cylinder 10 with respect to the eccentric shaft 9' by the surface engagement of the tapered surfaces 11' and 12', and also by the elastic spring 15. By constantly pressing and biasing, unlike the conventional rack and pinion engagement shown in FIG. 4, deburring can be performed with the accuracy as designed without any play.

After the deburring and cutting work is completed, the hydraulic cylinder 10 is pushed in the opposite direction to the above-mentioned process to move the eccentric shaft 9' forward in the left direction in the figure, thereby aligning the tapered surface 11' and the slider 7'. Since the tapered surface 12' moves toward the center against the elastic spring 15, the cutting tool 6' also moves toward the center within the counterbore hole 17 of the workpiece 16 and becomes concentric with the insertion hole 19, causing the hydraulic cylinder 10 to move toward the center. Even when the spindle 4' is stopped and the rotation of the spindle 4' by the pulley 5 is stopped, or the rotation is continued, the workpiece 16 is moved and the rotation of the spindle 4' is stopped.
The process of cutting and removing the burr 18 in the counterbore hole 17 of the next workpiece 16 is repeated.

As mentioned above, since the above process involves only the cam action via the elastic spring 15 of the slider 7', the diameter of the slider 7' is maintained without wobbling even when the eccentric shaft 9' moves back and forth. The simple cutting device 1 moves forward and backward in the direction, therefore, no breakdown occurs, almost no maintenance is required even if repeated cutting is performed, and the work can be continued without breakdown. ′
The durability is also good.

Furthermore, since the structure of the engaging portion of the eccentric shaft 9' and the slider 7' in the spindle 4' is simple, the structure of the simple cutting device 1' can be simplified.
As a result, the entire device can be made smaller and more compact.

Further, as a design change, it is of course possible to use another actuator instead of using a hydraulic cylinder as the advancing/retracting device.

The cutting process of the target workpiece can be used not only for deburring counterbore holes in automobile steering parts, but also for grooving and chamfering the back surface of other mechanical device parts.

<Effects of the invention> As described above, according to this invention, a simple cutting device can be used for counterboring holes and chamfering of back surfaces used in parts of automobile steering devices, or for deburring machined parts of grooving. In the spindle, a slider provided at the tip of the spindle and movable in the radial direction has an exchangeable cutting tool such as a cutting tool concentrically, and an eccentric shaft is provided in the spindle so as to be movable in the axial direction. Although it is designed to convert the movement adjustment from the direction to the radial direction, the conversion mechanism is constituted by engagement between a cam surface such as a tapered surface and a cam follower surface, and the slider also has an elastic force such as an elastic spring against the spindle. Because it is interposed between the spring and the spindle, the cam surface and cam follower surface are always in an engaged state, and the cutting tool is always pressed against the machined surface of the workpiece. It also avoids bump crashes caused by conventional rack pinions, etc., and no backlash occurs during operation.Therefore, cutting loads such as deburring in normal slots are small, and a high degree of positioning accuracy is not required. Although the structure of the simple cutting device is simple, it has good accuracy, does not loose after repeated use, and has good durability.In addition, because of the simple structure, the initial cost is low.
An excellent effect is achieved in that running costs can be kept low because no breakdowns occur.

In addition, the structure is simple, and the conversion between the axial movement of the eccentric shaft and the radial movement of the slider is performed by the cam surface and the cam follower surface, which are tapered surfaces. It is easy to process, the structure of the entire device can be made smaller and more compact, there is less interference with other equipment, it is easy to operate, and it has excellent workability.

This also has the effect of making it easy to center the cutting tool with a simple configuration, and in addition, since machining is performed with the cutting tool only by the biasing force applied to the slider, the cutting tool moves along the machining surface of the workpiece. An excellent effect is achieved in that processing such as deburring can be performed reliably.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of this invention, with Figure 1 being a schematic longitudinal cross-sectional view of the whole, Figure 2 being a partial enlarged cross-sectional view of the initial posture of the cutting tool when it is set on the workpiece, and Figure 3 4 is an enlarged partial cross-sectional view during cutting, and FIG. 4 is a schematic cross-sectional view of a conventional simple cutting device. 5...Rotating device, 4'...Spindle, 9'...
Eccentric shaft, 10... Advancement/retraction device, 6'... Cutting tool, 7'... Slider, 1'... Simple cutting device, 11'... Cam surface, 12'... Cam follower surface, 15... Spring.

Claims (1)

[Scope of utility model registration request] An eccentric shaft slidably inserted into a spindle connected to a rotating device is connected to an advancing/retracting device and engages a slider having a cutting tool so as to be movable in the radial direction within the spindle. In the cutting device, a tapered cam surface is formed at the tip of the eccentric shaft, and the slider is formed with a tapered cam follower surface that engages with the cam surface, and the slider is formed with a tapered cam follower surface that engages with the cam surface. The cutting tool is biased towards the machining surface of the workpiece in the direction and is slidably engaged with a guide groove formed at the tip of the spindle, and the cutting tool is disposed concentrically with respect to the slider. A simple cutting device.