JPS5823531Y2 - chamfering machine - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a chamfering machine.

Generally, plate cams used for diesel engine intake/exhaust cams, fuel cams, etc. are manufactured by cutting the mounting hole for the camshaft, both sides of the cam, and the profile, and then chamfering the profile. It is sent to the next process of heat treatment.

By the way, this chamfering work becomes extremely troublesome and takes a lot of time when the part to be chamfered is a ridgeline where the black skin part of the forging and the machined part intersect, as in the case of the above-mentioned plate cam. Is required.

When the curvature of the ridge line is not constant, as in the case of the plate cam B shown in Fig. 1, the only option is to rely on human hands, and attach the plate cam B to a workbench and use a file or a commercially available hand grinder to grind it into one kelp. Chamfering is performed.

However, this not only puts a burden on the workers themselves, but also
It takes too long, and no matter how quickly other work steps are completed, the plate cam is stocked during this chamfering process.
All you have to do is wait for the next process.

As a result, workers had to resort to manpower tactics, which resulted in inconveniences such as workers cutting their hands with files, getting the chips from the grinder in their eyes, and using the grinder spreading dust and noise into the surrounding area.

In addition, after the plate cam is chamfered, it is heat treated and then moved to the polishing process, but if the chamfer is defective due to operator error at this time, it will be difficult to secure the contact surface between the plate cam and the tappet roller. Inconveniences may occur, such as quenching cracks occurring during the heat treatment process, and assembly workers cutting their hands on the sharp edges.

Therefore, this invention improves and eliminates the above-mentioned conventional drawbacks by providing a machine that automatically and reliably chamfers the profile portion of a plate cam.The following is an explanation of this invention according to an embodiment shown in the drawings. The process is as follows.

In Figures 2 to 4, A is a chamfering machine according to this invention, and this chamfering machine A has a main shaft part I consisting of a main shaft unit 1 and a main shaft body 2 that holds it and transmits power thereto, and a plate. The main shaft body 2 is connected to the main shaft unit 1 via a pulley 5 and a belt 6 from a motor 4 fixed with bolts to the upper part of the main shaft unit mounting base 3. By transmitting power to a pulley 8 fixed to a shaft 7, the main shaft unit 1 is rotated.

Next, as shown in FIG. 5, the main shaft unit 1 has a main shaft 11. mounted on the lower part of the main shaft unit mounting base 3 in a state fixed in the thrust direction by a rolling bearing 10 and a thrust bearing 9. It consists of a guide roller 12 inserted into the center of the main shaft 11, and symmetrical tools 13 arranged on both sides of the guide roller 12.
2 is fixed in the main shaft thrust direction by a nut 14 at the right end of the main shaft unit 1 via a collar 15 and a bearing 16.

Further, the tool 13 is generally used in a radial drilling machine or the like.

A slightly improved sheet surface cutter [with 30 or more blades and shallow grooves between each blade] is used, and the rotation of the main shaft 11 is controlled via the sinking key 17 (or pin). It is meant to be transmitted.

Reference numeral 18 denotes a spring for pressing the tool 13 against the guide roller 12. This spring 18 is designed to apply a pressing force of about 500 g or less to the tool 13 by nuts 19 located on both sides of the spring. When a thrust force greater than the pressing force is applied to the tool 13, the tool 13 is made to slide in the thrust direction.

Incidentally, the spindle unit 1 may have a shape as shown in FIG. 6.

The main spindle I, which consists of the main spindle unit 1 and the main spindle body 2, does not swing when force is applied back and forth using the female work shaft 21 of the support stand 20 located at the bottom of the main shaft I as a fulcrum. During machining, a spring 25 placed between the main spindle motor base 22 and a stopper 24 bolted to the machine base 23 allows the guide roller 12 of the main spindle I to attach the workpiece, which will be described later. The guide roller 12 is designed to come into contact with the profile part of the plate cam B held in the part (3), so that even if the plate cam B is oval or oval, the guide roller 12 always comes into contact with the profile part of the plate cam B. be.

Also, when not machining, the stopper 2 fixed to the machine base 23
4 and a lever 27 bendably attached to the main shaft motor base 22 with a pin 26, the main shaft part I is locked to the right side in FIG. 4 against the elasticity of the spring 25, and the plate cam B A space necessary for removing the plate cam B should be provided between the tool 13 and the tool 13.

Further, the workpiece attachment part (■) is equipped with a reducer 29 having an output shaft 28 for rotating the plate cam B, and an input shaft 30 of the reducer 29.
The plate cam B is attached to the output shaft 28 by sinking into the output shaft 28 and sliding freely in the axial direction via a key 34. This is done by fixing the plate cam B to a holder 35 attached to the holder 35.

In the above configuration, in order to chamfer the profile portion of the plate cam B with the device of this invention, first, the main shaft portion I
Push it backwards by hand against the elasticity of the spring 25, hold it with the stopper 24 and lever 27, and press the main shaft part I.
Leave a space between the and the workpiece attachment part ■.

Note that this spindle portion I can be tilted down until the spindle unit mounting base 3 comes into contact with the machine base 23.

Next, attach the plate cam B to the holder 35 of the workpiece attachment part ■.
Attach to.

At this time, the plate cam B is positioned approximately at the center of the two tools 13 attached to the spindle unit 1.

Next, when the motors 4 and 33 are rotated and the lever 27 is lifted while the main shaft part I is tilted backward, and the force pushing the main shaft part I is loosened, the guide roller 12 of the main shaft unit 1 is moved by the spring 27. It is pressed against the profile part of plate cam B.

When the plate cam B rotates in this state, the guide roller 12 moves along the profile part, and the profile part of the plate cam B is chamfered by tools 13 arranged on both sides of the guide roller 12.

Then, when the plate cam B rotates once, the main shaft part I is pushed backwards by hand in the same way as the first time, and the lever 27 is moved to the stopper 24.
At the same time, the motors 4 and 33 are stopped and the tool 13 is engaged.
After the rotation of the plate cam B has stopped, the plate cam B is removed from the holder 35 of the workpiece attachment part 3, and the machining is completed.

In addition, due to fluctuations such as the size and unevenness of the plate cam B,
If the amount of variation is within the movement range of the tool 13, the spring 18 that presses the tool 13 against the guide roller 12
When the elasticity of the tool 13 becomes smaller than the thrust component due to the cutting force of the tool when the tool 13 performs chamfering, the tool slides in the direction in which the spring 18 contracts, so that the dimension of the plate cam B to be chamfered decreases. is almost uniform over the entire circumference of the profile.

As explained above, the present invention is a spindle in which a guide roller is inserted into the center of the spindle, and a tool is attached to the spindle by applying a biasing force to the guide roller by a spring at symmetrical positions on both the left and right sides of the guide roller. It is composed of a unit and a main shaft body that holds the main shaft unit and transmits power to it, supports the main shaft unit so as to be swingable in the front and rear directions with the female worker shaft as a fulcrum, and always applies a biasing force in the forward direction by a spring. It consists of a spindle and a workpiece mounting section that holds the workpiece to be chamfered by the tool of the spindle unit, and the guide roller of the spindle unit is pressed against the workpiece attached to the workpiece mounting section by a spring. By accurately guiding the tool around the outer circumference of the workpiece whose curvature is not constant, and by pressing the tool against the guide roller using a spring, when the guide roller moves along the outer circumference of the workpiece, the elasticity of the spring is greater than the elasticity of the spring. When a large thrust force is applied, the tool slides in the axial direction of the main shaft, so during machining, the guide roller attached to the main shaft moves along the profile of the plate cam, etc.
Therefore, it is possible to automatically and accurately chamfer the profile portion of a workpiece such as a plate cam whose curvature is not constant, and the working time can be reduced to about 1/6 compared to conventional manual work.

In addition, by mechanizing the chamfering work on the profile of the plate cam, quality can be stabilized, and because chamfering work does not use a pickpocket or a grinder unlike conventional methods,
It does not spread dust or noise to the surrounding area, and work safety can be improved because the workpiece is attached to the workpiece attachment part.

In addition, since two tools are attached to one spindle and driven simultaneously, the structure is simple and manufacturing costs are low.
It is possible to achieve miniaturization.

[Brief explanation of the drawing]

Fig. 1 A and A are front and side views showing an example of a plate cam, Fig. 2 is a front view of the chamfering machine according to this invention, Fig. 3 is a plan view, Fig. 4 is a side view, and Fig. 5 is a front view and a side view showing an example of a plate cam. The figure is a detailed view of the spindle unit, and FIG. 6 is a drawing showing another embodiment of the spindle unit. A... Chamfering machine, B... Plate cam, ■... Main shaft part, ■... Workpiece mounting part, 1... Main spindle unit, 2...
...Main shaft body, 11...Main shaft, 12...Guide roller, 13...Tool, 18.25...Spring.

Claims (1)

[Scope of utility model registration request] A guide roller is inserted into the center shaft of the main shaft, and a biasing force is applied by a spring to the guide roller at symmetrical positions on both left and right sides of the guide roller to hold the main shaft unit with a tool attached to the main shaft and the main shaft unit. , a main shaft body that transmits power to the main shaft, a main shaft part that is supported so as to be able to swing back and forth around the support shaft as a fulcrum, and is constantly biased forward by a spring, and a tool of the main shaft unit. The guide roller of the spindle unit is pressed against the workpiece attached to the workpiece mounting part by a spring, and the workpiece with uneven curvature can be chamfered. By accurately guiding the tool around the outer circumference and pressing the tool against the guide roller using a spring, when the guide roller moves along the outer circumference of the workpiece, when a thrust force greater than the elasticity of the spring acts, the tool 1. A machine for chamfering an outer peripheral portion of a cam, etc., characterized in that the cam slides in the axial direction of the main shaft.