JPS6179046A - Method of manufacturing ring with outer clicks of automatic speed change gear - Google Patents

Abstract

PURPOSE:To decrease the steps of a manufacturing process by cold forging a ring with outer clicks, and cutting and dividing same. CONSTITUTION:A blank steel pipe is extruded by a die by means of a punch to obtain a machined blank steel pipe 4. The machined blank steel pipe 4 staying in the die 3 is thrust down by the next blank steel pipe to be machined. The machined blank steel pipe 4 has a section C-C, a one-way clutch 6 at the inner surface thereof and clicks 7 at the outer surface thereof. The thus machined blank steel pipe 4 is cut to a proper size and divided to obtain a lot of rings with outer clicks.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for manufacturing a ring with an external claw used in automatic transmissions of vehicles including passenger cars.

Conventional technology Conventionally, in order to manufacture rings with external claws used in automatic transmissions of vehicles including passenger cars, there are two methods: one is to cut a ring-shaped material, and the other is to recycle powdered sintered material. 133Jllll
Further, there is a method (2) of sintering and coining the finished molded material as it is.

Methods belonging to ① include cutting a 1g pipe or making a steel ring using a ring mill, finishing the outer and inner diameters of the steel pipe to the required dimensions, milling the outer periphery of the steel pipe and finishing it into a claw shape, and applications. Broach the inner surface of the ring with
There are ways to create a cam shape.

Methods belonging to (1) include a method of putting alloy powder or mixed powder in a mold and pressurizing it to make it into a shape similar to the product, 1100 to 120
There is a method of heating to 0'C and sintering, and a method of heating to 900 to 1100C, inserting it into a finishing mold, applying pressure, and finishing.

Problems to be Solved by the Invention The above method involves a lot of cutting work, resulting in poor yields, and requires a special processing machine to process the claws, cams, etc., which requires a large number of man-hours. .

Method (2) requires expensive powder materials and high-temperature finishing, making it difficult to achieve precision. Furthermore, in order to prevent decarburization and oxidation, etc., an atmospheric furnace or Automatic VJ charging equipment height (requires high equipment).

Method (2) does not provide sufficient specific gravity of the product and can only be applied to parts that do not require strength.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention involves cold forging a tubular material as it is, finishing the inner and outer surfaces in the shape of a ring with outer claws for an automatic transmission, and forming the inner and outer surfaces as required. This method consists of a method for manufacturing a ring with an external pawl for an automatic transmission, which is characterized by cutting into dimensions.

In the above cold forging, a punch with a shape corresponding to the one-way clutch outer shape is used in the mandrel part, and
A die with a claw shape is used for extrusion. Then, after each stroke, the workpiece is stopped in the mold and pushed down by the next tubular material to be worked.

In the cutting process, cutting with a saw, turning, parting, etc. are used.

EXAMPLE To explain the example based on the drawings, FIG. 1 is a cross-sectional view showing the state during cold forging, where 1 is a raw steel pipe, 2 is a punch,
3 indicates a die, and 4 indicates a raw steel pipe extruded by the raw steel pipe 1.

FIG. 2 is a sectional view of the raw steel pipe 1, FIG. 3(A) is a front view of the punch 2, and FIG. 3(B) is a sectional view taken along line A-A in FIG.

The mandrel portion of the punch 2 has a shape corresponding to the outer shape of the one-way clutch.

FIG. 4(A) is a front sectional view of the die 3, and FIG. 4(B) is a sectional view taken along line B-8 in FIG.

By punching such a raw steel pipe 1 with a punch 2 and extruding it with a die 3, a processed raw steel pipe 4 shown in FIGS. 5(a) and 5(b) is produced.

The processed material 14 pipe remaining in the die 3 is pushed down as the material steel pipe 1 to be processed next is processed.

Figure 5 (a) is a front view of the processed raw material steel pipe 4;
It has a C-C cross section shown in b).

It has a one-way clutch 6 on the inner surface and a pawl 1 on the outer surface.

The processed raw steel pipe 4 is cut into appropriate dimensions to obtain a large number of rings with external claws.

Effects of the Invention According to the present invention, since the tubular material is cold-forged as it is without being separated, milling of the outer diameter claw and broaching of the inner surface are omitted compared to the conventional machining process. No special processing machine is required, and the number of man-hours is also reduced. In cold forging, the tubular material can be held in the die with each stroke and then pushed down by the next tubular material, so... 5
There is no need for an advanced extraction device.

Furthermore, unlike powder afforestation, it can be formed without requiring special equipment such as sintering or hot forging.

In addition, it is possible to obtain a molded material with higher strength than powder molded material.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the state during cold forging according to the present invention, Figure 2 is a sectional view of the raw steel pipe, Figure 3 (A) is a front view of the punch, and Figure 3 (B) is (A). 4 (a) is a sectional view of the die, (b) is a BB sectional view of (a), and FIG. 5 (a) is a front view of the processed material steel pipe. (B) shows a CC sectional view of (A), respectively. 1...Material steel pipe, 2...Punch, 3...Dice,
4... Processed material steel pipe, 5... Claw forming protrusion,
6...One-way clutch, 7...Claw. Patent applicant Mitsubishi Steel Corporation (1 other person) Agent Patent attorney Hide Komatsu Agent Patent attorney Kosai Asahi

Claims (1)

[Claims] An outer shell for an automatic transmission characterized in that a tubular material is cold-forged as it is, the inner and outer surfaces are finished in the shape of an outer claw ring for an automatic transmission, and this is cut into required dimensions. A method of manufacturing a ring with claws.