JPS62218013A - Groove cutting work method for gear shaped member made of sheet metal - Google Patents

Abstract

PURPOSE:To form a groove section on the projected section on the circumferential surface with less burrs generated by removing burrs generated by a step of rotating a separate cutting tool reversely after the groove section has been formed on the circumferential surface of a gear shaped member while covering an entire width in the circumferential direction. CONSTITUTION:A gear shaped member 1 is rotated to the direction A for forming a groove section 4 on a projected section 2 by a cutting tool 3. In this case, burrs are generated at the corner section 4a of this side. Subsequently, the member 1 is rotated to the direction B while being fed by one pitch equivalent to one tooth profile, furthermore, a plurality of cutting tools 7a provided above the circumferential surface of the member 1 is rotated to the direction C for removing burrs 5 generated at the corner section 4a. Accordingly, there is no need for No.3 process for removing burrs.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a grooving method for forming circumferentially extending grooves in a convex portion of the circumferential surface of a gear-shaped sheet metal member.

(Prior art) In recent years, when manufacturing low-cost, lightweight gear-like members (for example, gears with relatively low surface pressure at meshing points, or gears with a low tooth height compared to modules), flat plate materials are being plastically deformed. It is common practice to process the cylindrical body to form a tooth pattern on the side peripheral surface of the cylindrical body. In order to fit a ring-shaped positioning member such as a snap ring for positioning the gear-shaped member formed in this way to the IF5 contact member, the circumference is inserted into the convex portion of the inner peripheral surface or the convex portion of the outer peripheral surface of the gear-shaped member. It is necessary to form a groove extending in the direction.

Conventionally, in forming such a groove, first, a groove is formed by rough cutting over the entire width in the circumferential direction on the convex part of the circumferential surface of a gear-shaped member, and then finish cutting is performed on the entire groove from a direction opposite to the rough cutting direction. Although machining was performed to remove the burr generated at the cut end of the groove portion by the rough machining, after the finish machining, burr was sometimes generated at the finish cut end. Therefore, a polishing process using a wire brush has been added to remove the particles after the finishing process.

(Problems to be Solved by the Invention) When performing 114 cutting on the convex portion of the circumferential surface of a gear-shaped member as in the above conventional example, there is a rough cutting process, an IL up-cutting process, and polishing using a wire flange. Three steps are required, and the attachment of the gear-shaped part must be replaced each time, which poses a problem of complicating the process and increasing processing time.

The present invention has been made in view of the above points, and an object of the present invention is to form a groove on the circumferential surface of a gear-shaped member with extremely low occurrence of flashing without significantly increasing the machining time. It is.

(Method for solving the problem) In the present invention, as a rounding method to solve the above problem,
After cutting and forming a groove portion on the circumferential convex portion of a sheet metal gear-shaped member over the entire width in the circumferential direction, when the gear-shaped member is rotated and fed by a pitch corresponding to one tooth shape of the gear-shaped member, A plurality of cutting tools arranged around the circumference of the gear-shaped member cut 119 marks 1 from the direction opposite to the cutting direction in the first step.
Cut each of the hands 17ii (llllI) by 4 degrees so as to scoop up only the corners.

(Function) In the present invention, the following effects can be obtained by the above method.

That is, after the first step of cutting and forming a groove on the circumferential convex portion of the gear-like member over the entire width in the circumferential direction, burr occurs at the end of the groove (i.e., the end in the cutting direction). The burrs are removed by cutting in a direction opposite to the cutting direction in the first step 01j so as to scoop up only the front corner of each groove. Therefore, by only the two steps of grooving and deburring, it is possible to form grooves with extremely low occurrence of burrs in the convex portion of the circumferential surface of the gear-like member.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In the following embodiment, a timing pulley of an automobile will be used as an example of a sheet metal gear-shaped member.

This timing pulley! On the convex portion 2.2... on the inner circumferential surface,
When cutting and forming the groove for inserting the snap ring, first, as shown in FIG.
The timing pulley (2) is rotated in the direction of the arrow U', and the groove portion 4 is cut and formed over the entire circumferential width of each of the convex portions 2, 2, . . . (first step). At this time, burrs 5 are generated on the cutting direction end side 4a of the groove portion 4 formed in each of the convex portions 2, as shown in FIG.

Thereafter, a second step is carried out to remove the burrs 5 generated in the first step, and in this second step, the apparatus u shown in FIGS. 3 and 4 is used.

That is, the main shaft 6 rotatably supports the timing pulley 1.
, four cutting tools 7, 7, 7.7 that are movable in and out of the timing pulley 1, and these cutting tools 7.7.7.
．． A second process is performed on the timing pulley l by a device equipped with a multi-axis attachment 8 that rotatably supports the timing pulley l. The main shaft 6 is provided with a chuck 9 that detachably holds the timing pulley l. This main shaft 6 has teeth of the timing pulley 1.
. . . is configured to be indexed and rotated by a pitch P (see FIG. 4) corresponding to one pitch. Meanwhile, said cutting tool? , 7, 7.7 are configured to be rotated in the same direction (that is, in the direction C opposite to the cutting direction B in the first step), and each has a cutting edge 7a. Then, when the valley cutter r57 is advanced into the timing pulley l supported by the main shaft 6, the cutting edge 7a is at the front corner of the groove 4 (i.e., at the end in the cutting direction in the first step). Part) The center of rotation is positioned so as to draw a rotation locus that allows only the portion 4a to be scooped up.

Then, in the second step, the main shaft 6 is indexed and rotated, and the timing pulley l is rotated into the tooth shapes 1a, 1a...
While rotating by a pitch P corresponding to one piece of
As shown in FIG. 4, the cutting tools 7, 7, etc., positioned so as to face the inner circumferential surface of the timing pulley l, are rotated in a direction C opposite to the cutting direction B in the first step. The front corner of the groove 4 formed in (in other words, the terminal end in the cutting direction in the first step) 4
It is cut so that only part a can be scooped up (see Figure 5). At this time, the paris 5 generated at the end portion (in other words, the front corner portion) 4a of the groove portion 4 in the cutting direction in the first step is removed. Next, the timing pulley l is rotated by the pitch P in the same manner as described above, and then the same cutting process as described above is performed. By repeating the above steps, the entire groove 4.
This completes the parity removal for 4.... Note that the notched groove lO cut and formed in the second step and the first
The angle α formed by the bottom surface of the groove portion 4 formed by cutting in the step is an obtuse angle, thereby suppressing the occurrence of flash at the terminal end side of the notched groove IO formed by cutting in the second step. It becomes.

Thus, each convex portion 2 on the inner circumferential surface of the timing pulley l has a
This results in the cutting and forming of 114 with extremely low occurrence of paris.

In the above embodiments, a timing pulley is used as an example of a gear-shaped member, but it goes without saying that the method of the present invention is also applicable to gear-shaped parts other than timing pulleys.

In addition, in the above embodiment, a case was described in which a groove was cut and formed on a convex portion on the inner circumferential surface of a gear-shaped member. The invention can be applied.

(Effects of the Invention) According to the method of the present invention, as in a pickup truck, after cutting and forming 161 parts on the circumferential surface convex portion of the sheet metal gear-shaped member over the entire width in the circumferential direction, the front gL! The gear-like member is rotated and fed by a pitch corresponding to one tooth pattern, and each of the above-mentioned parts is cut from a direction opposite to the cutting direction in the first step using a plurality of cutting tools arranged on the circumference of the gear-like member. Since the cutting is performed so as to scoop up only the front corner of the Ui portion, the burr generated at the end of the groove (i.e., the end in the cutting direction) when forming the groove is removed in the opposite direction to the cutting direction. It can be removed by scooping up and cutting only the front corner of each groove, and the processing time is relatively short, consisting of only two steps: grooving and deburring, and there is extremely little occurrence of burrs. There is an excellent effect that the 'tri portion can be formed on the convex portion of the circumferential surface of the gear-like member.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first step in the grooving method according to the embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is the grooving method according to the embodiment of the present invention. The second in
FIG. 4 is a side view showing the apparatus used in the process; FIG. 4 is a sectional view showing the second step in the groove cutting method according to the embodiment of the present invention;
FIG. 5 is a partially enlarged view of FIG. 4. l...Gear-shaped member Ia...Tooth profile 2...Convex portion 4...Groove portion 4a...Front side corner portion 7...Cutting tool P. ... φ pitch / ... South medium member / C ... tooth type 2 ... l"11'% l ... groove part α ... J '1ii1 fllll fr+part 7 ・--・-ull+l1l-"1B+1 ・・
...Pitch figure 3

Claims (1)

[Claims] 1. A first step of cutting and forming a groove on the circumferential convex portion of the sheet metal gear-shaped member over the entire width in the circumferential direction, and rotating the gear-shaped member by a pitch corresponding to one tooth shape of the gear-shaped member. At the same time, a second step of cutting each of the grooves in a direction opposite to the cutting direction in the first step so as to scoop up only the front corner of each groove using a plurality of cutting tools disposed on the circumference of the gear-shaped member. A method for cutting grooves in a gear-shaped member made of sheet metal, the method comprising the steps of: