JPH08257855A - Workpiece supporting device of cam shaft mirror - Google Patents

Abstract

PURPOSE: To improve machining accuracy and reducing noise, by preventing deflecting and vibrating a workpiece when it is machined. CONSTITUTION: In a workpiece supporting device formed so as to support a journal part 3c of a workpiece machined by a cam shaft mirror with a plurality of supporting members 6, 7 from downward and from an opposite side to a machining direction, a clamp lever 13a and a drive means 14 of driving this clamp lever are provided downward from the workpiece, also to protrude a clamp part 13c of the clamp lever 13a obliquely upward the workpiece from a side of a cutter 4 of machining the workpiece, and the journal part 3c is rotatably clamped between the clamp part 13c and the supporting members 6, 7. Since the workpiece can be machined by simultaneously clamping its total journal part 3c, generating deflection, vibration, etc., in the workpiece during machining is eliminated, thus to enable machining accuracy to improve and noise to reduce.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work support device for a camshaft mirror that processes a camshaft used in an engine or the like.

[0002]

2. Description of the Related Art Conventionally, a camshaft used in an engine or the like is milled by using a camshaft mirror. However, if the workpiece (camshaft) is bent during the machining, it cannot be machined with high accuracy. Therefore, conventionally, the journal portion of the work is supported by the work supporting device to prevent the work from bending during the work, thereby enabling highly accurate work.

Examples of the work supporting device include, for example, Japanese Utility Model Laid-Open No. 4-54640 and Japanese Utility Model Laid-Open No. 5-86435.
It is proposed in Japanese Patent Publication No. In the work supporting device of the former publication, a base having an inclined upper surface is mounted on a bed of a camshaft processing machine, and a guide rail is laid on the upper surface of the base along the longitudinal direction of the work to be processed. A plurality of rest members that support the journal portion of the work from below and on the opposite side in the processing direction are movably attached to the rail. In the latter work supporting device, the supporting surface of the supporting member that supports the work from the lower side among the supporting members that support the work from the lower side and the cutting direction is the side of the supporting member that supports the work from the horizontal direction. The structure is such that it is inclined to and the clamp mechanism for pressing the work from above is provided above the work.

[0004]

However, in the work supporting device of the former publication, since the journal part of the work is supported from the lower side and the two directions opposite to the cutting direction, the work vibrates upward due to the cutting reaction force. However, there is a problem that the processing accuracy is lowered and noise such as chatter noise is generated during processing. Further, the work supporting device of the latter publication can press down the work from above, so that the problem as in the former publication can be improved, but since the clamp mechanism is located above the work, it has the following problems.

(1) If a clamp mechanism for simultaneously clamping all journals of a workpiece is adopted in order to reduce noise during machining, it is necessary to secure a large installation space above the workpiece due to an increase in the size of the clamp mechanism. Yes,
As a result, there is no space for installing the positioning device and the like, so a clamp mechanism for simultaneously clamping all journals cannot be adopted. (2) Further, since chips generated during machining are likely to stay and accumulate in the clamp arm and the driving means for driving the chip, there is a problem that positioning and clamping of a workpiece to be machined next occurs. The present invention has been made to improve the above-mentioned conventional problems, and provides a work support device for a camshaft mirror capable of simultaneously clamping all journal parts of a work to be processed, thereby improving the working accuracy and the working accuracy. The purpose is to reduce the noise generated inside.

[0006]

In order to achieve the above object, the present invention is designed so that a journal portion of a workpiece to be machined by a camshaft mirror is supported by a plurality of supporting members from below and on the opposite side in the machining direction. In the supporting device, a clamp lever and a driving means for driving the clamp lever are provided below the work, and the clamp portion of the clamp lever is projected obliquely above the work from the cutter side for processing the work to form the clamp portion. The journal part is rotatably clamped between the support members.

Further, in a work supporting device in which a journal portion of a work to be machined by a camshaft mirror is supported by a plurality of supporting members from below and on the opposite side in the machining direction, a clamp lever and a clamp lever are driven below the work. And a clamp portion of the clamp lever is provided so as to project from the cutter side for processing the workpiece so as to face the plurality of support members with the journal portion interposed therebetween, and substantially on the center line between the support members. The clamp portion is positioned so that the journal portion is rotatably clamped between the clamp portion and each of the support members. Further, the cutter for processing the work is provided with a recess so as not to interfere with the clamp lever.

[0008]

[Operation] Since the work can be processed in a state where all the journals of the work are clamped by the above configuration, the work does not bend or vibrate, which improves the processing accuracy and reduces noise. Also, since all the journal parts are clamped at the same time, it is not necessary to install a large-sized clamping means above the work, so that it does not interfere with the positioning device, etc., and the chips generated during processing stay in the clamping means. Since it does not accumulate, it does not hinder the positioning and clamping of the workpiece to be processed next. Further, since two cams adjacent to each other can be simultaneously processed in a state where all the journals are clamped, the productivity is high and the cutter and the clamp lever do not interfere with each other due to the recessed portion provided in the cutter.

[0009]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a plan view showing a state in which a work is supported by a work support device of a camshaft mirror, FIG. 2 is a view taken along the line AA of FIG. 1, FIG. 3 is an enlarged view in a circle B of FIG.
4 is a view in the direction C of FIG. 2, and FIG. 5 is a view in the direction D of FIG.

In FIG. 1, 1 is a pair of work heads,
The chucks 2 are rotatably provided on the surfaces facing each other, and both ends of the work 3 are held between the chucks 2. The chuck 2 has a center 2a in the center and three claws 2b around the center 2a. With each center 2a supporting the center holes 3a at both ends of the workpiece 3, each claw 2b is supported. Thus, the outer periphery of both ends of the work 3 is gripped and the work 3 is rotated. Reference numeral 4 denotes a disk-shaped cutter for milling the cam 3b of the work 3, and two cutters for simultaneously processing two adjacent cams 3b. The cutter 4 is mounted on the cutter support member 4c at an interval equal to the interval between the cams 3b. It is attached and rotated in the direction of arrow A shown in FIG. 3 when machining a workpiece, and on the outer peripheral side of each cutter 4, a clamp lever 13a described later is provided.
Is provided with a recessed portion 4a so as not to interfere with a plurality of chips 4b for milling the work 3 on the outer peripheral surface.
Are mounted at equal intervals in the circumferential direction.

Reference numeral 5 denotes support members 6 and 7 for simultaneously supporting all the journal portions 3c of the work 3 and a clamp lever 13.
2 shows a work rest device body having a. As shown in FIG. 2, the work supporting device main body 5 has a base 5a fixed on the bed 9 of the camshaft mirror, and the upper surface of the base 5a is inclined so as to be lowered toward the cutter 4. The inclined surface 5b is formed on the supporting table 5b.
c is fixed by the fixing tool 12. The support 5c
Is, for example, 4 at the same interval as the journal part 3c of the work 3.
The support members 6 and 7 that are provided as a base and that support the journal portion 3c of the work 3 from below and in a direction opposite to the machining direction are provided above the support bases 5c. The support members 6 and 7 are composed of supports 6a and 7a horizontally attached to the respective supports 5c and pads 6b and 7b attached to the tips of these supports 6a and 7a. The pad 7b of the support member 7 which is supported from below is slightly closer to the cutter 4 side than directly below the journal portion 3c, and supports the journal portion 3c from diagonally below.

On the other hand, the work supporting device main body 5 is provided with a clamp means 13 for each supporting table 5c. The clamp means 13 comprises a clamp lever 13a whose lower end is rotatably pivoted by a pin 13b to a lower portion of the support base 5c on the cutter 4 side, and a drive means 14 for rotating the clamp lever 13a. The upper end side of the clamp lever 13a is a clamp portion 13c, which is projected obliquely above the work 3 from the cutter 4 side, and when two cams 3b adjacent to each other are simultaneously processed by the two cutters 4. The clamp portion 13c of the clamp lever 13a is located in the recessed portion 4a formed on the tip side of the cutter 4 as shown in FIG. 1, so that the clamp lever 13a and the cutter 4 do not interfere with each other. Then, at the tip of the clamp portion 13c, the journal portion 3 is located approximately on the center line (c) between the two support members 6 and 7 provided so as to face the clamp lever 13a with the journal portion 3c interposed therebetween.
A pad 13d is provided that presses c toward the support members 6 and 7 and clamps the journal portion 3c between the support member 6 and 7 in a rotatable manner.

Further, one end of a link 13f is pivotally attached by a pin 13e to the substantially middle portion of the clamp lever 13, and the other end side of the link 13f is pivotally attached by one end of a connecting member 15 by a pin 16. . The other end of the connecting member 15 is screwed to a piston rod 14a of a driving means 14 composed of a hydraulic cylinder attached to the surface of the support base 5c opposite to the clamp lever 13c. The clamp lever 13a is rotated via the link 13f. It should be noted that 18 in FIG. 2 and FIG.
An air nozzle that ejects air between c and the clamp lever 13a to blow off the chips generated during processing is shown.

Next, the operation of the work supporting device configured as described above will be described. First, with the clamp lever 13a of the clamp means 13 opened as shown by the phantom line in FIG. 3, a work piece 3 is carried in between the chucks 2 from above the camshaft mirror by a loader (not shown), and then each chuck 2
After both ends of the work 3 are supported between the centers 2a of the workpieces 2 to perform centering and phase positioning of the work 3, both ends of the work 3 are gripped by the pawls 2b. Next, the clamp lever 13a located between the respective journal portions 3c of the work 3 is rotated in the direction of the work 3 around the pin 13b by the driving means 14, and the pad 13d provided at the tip of the clamp lever 13a is moved to the journal portion. 3c is pressed diagonally upward to support members 6, 7
The journal portion 3c is clamped from three sides between the pads 6b and 7b. In this state, while rotating the work 3 in the arrow (b) direction in FIG. 3, the cutter 4 rotating in the arrow (b) direction is advanced to the position of the cam 3b to be machined,
Two cams 3b adjacent to each other are simultaneously processed by the two cutters 4. At this time, since all the journal portions 3c are supported from the three sides by the support members 6 and 7 and the clamp lever 13a, the work 3 does not bend or vibrate due to the cutting reaction force, which allows highly accurate machining. In addition, it does not cause noise such as chattering noise during processing.

When the processing of the two cams 3b adjacent to each other is completed as described above, the cutter 4 is sequentially moved as shown by the phantom line in FIG. Since a single cam 3b is machined, it is possible to efficiently machine a twin cam type camshaft in which two cams 3b having the same phase are provided in one place. In the above embodiment, the case of processing the camshaft used in the four-cylinder engine has been described, but it goes without saying that the camshaft used in the engine other than the four-cylinder engine can be processed in the same manner.

[0016]

As described in detail above, according to the present invention, a clamp lever for clamping a work between a plurality of supporting members and a driving means for driving the work are installed below the work while the work is being processed. Since the clamp part of the lever is projected obliquely above the work from the cutter side to support the journal part of the work, even with a large-sized clamping means for simultaneously clamping all the journal parts of the work, Since there is no need to install a space above the work, it does not interfere with a positioning device or the like provided above the work, and thus a large-sized clamping means for simultaneously clamping all the journal portions can be easily adopted. In addition, since all journals are simultaneously supported from three directions during machining, the rigidity of the work increases, which prevents the work from flexing or vibrating during machining, which enables high-precision machining and prevents chattering noise. Since there is no generation, noise can be reduced. Furthermore, since the clamp lever and drive means are located below the work, chips generated during processing do not adhere to the clamp lever or drive means, accumulate, or accumulate, thereby positioning the next work to be processed. And it does not interfere with the clamping. Moreover, since the cutter and the clamp arm do not interfere with each other due to the recessed portion provided on the tip side of the cutter, two cams that are adjacent to each other can be processed at the same time with all the journal parts clamped, thereby improving productivity. Can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a state where a work is supported by a work support device for a camshaft mirror according to an embodiment of the present invention.

FIG. 2 is an arrow view taken along the line AA of FIG.

FIG. 3 is an enlarged view of a circle B in FIG.

FIG. 4 is a view from the direction C in FIG.

5 is a view from the direction of the arrow D in FIG.

[Explanation of symbols]

 3 ... Work 3c ... Journal part 4 ... Cutter 4a ... Recessed part 6, 7 ... Support member 13a ... Clamp lever 13c ... Clamp part 14 ... Driving means

Claims (4)

[Claims] 1. A work supporting device in which a journal portion 3c of a work 3 to be machined by a camshaft mirror is supported by a plurality of supporting members 6 and 7 from below and on the opposite side in the machining direction. The clamp lever 13a and the driving means 14 for driving the clamp lever 13a are provided, and the clamp portion 13c of the clamp lever 13a is provided.
From the side of the cutter 4 for processing the work 3 obliquely upward of the work 3, and the clamp portion 13c and the support member 6,
A work supporting device for a camshaft mirror, characterized in that a journal portion 3c is rotatably clamped between 7 and 7. 2. A work supporting device in which a journal portion 3c of a work 3 to be machined by a camshaft mirror is supported by a plurality of supporting members 6 and 7 from below and on the side opposite to the machining direction. The clamp lever 13a and the driving means 14 for driving the clamp lever 13a are provided, and the clamp portion 13c of the clamp lever 13a is provided.
Is provided so as to be opposed to the plurality of support members 6 and 7 with the journal portion 3c interposed therebetween from the side of the cutter 4 for processing the work 3, and the clamp portion 13c is provided substantially on the center line between the support members 6 and 7. A work support device for a camshaft mirror, characterized in that the journal part 3c is rotatably clamped between the clamp part 13c and each of the support members 6 and 7 when positioned. 3. The work supporting device for a camshaft mirror according to claim 1, wherein the cutter 4 is provided with a recessed portion 4a for preventing the cutter 4 from interfering with the clamp lever 13a. 4. A work supporting device for a camshaft mirror according to claim 2, wherein the cutter 4 is provided with a recess 4a for preventing the cutter 4 from interfering with the clamp lever 13a.