JPS6068123A - Working method of shaft - Google Patents

Abstract

PURPOSE:To reduce the weight of a shaft and man-hour by forming respectively the shaft core part and outside part of the shaft of a steel material and light metal, blanking a groove hole to the shaft core part and forging and blanking a hole communicating with the above-mentioned groove hole to the light metal. CONSTITUTION:A drawn steel material 10 having a rectangular section is pressed to form a shaft core member 16 having step parts 14, 15, a groove hole 12 and a hole 13. A drawn light metal material 11 of which the outside circumference consists of a plane 11a, a circular arcuate surface 11b and a recess 11c is cut to form an outside member 17. The members 17a, 17b are pressed to both surfaces of the member 16 and are driven and fixed into the respective holes to obtain an assembled material 18. The assembled plate 18 is inserted into dies and the light metal in the recess 11c is plastically flowed by a pair of punches to form side walls at both ends in the longitudinal direction of the recess 11c and to force the exess metal into the hole 12. The light metal in the hole 12 is press-blanked and a shaft 33 having a groove hole 24 for engaging a belt is obtd. The weight of the shaft and the man-hour for working are thus reduced.

Description

[Detailed Description of the Invention] Prenatal - No. 1 This invention relates to a method for processing a shirt I, and in particular, a method for forming a groove along the axis of a shirt I for a retractor around which an automobile safety belt is wrapped. In addition, a shaft having a shape in which fixed shaft portions are protruded in a stepped manner from both ends can be processed extremely easily, and the shaft can be used over time.

PRIOR ART Conventionally, as shown in FIG.
Take the gear V2 at one end and install it on the frame 3, lock one end of the bells 1 to 4 inside the ila of the shirts 1 to 1,
Wrap the belt 4 around the outer peripheral surface of the shaft 1 (C bells 1 to 4)
When the belt 4 is used, the belt 4 is unwound from the shaft 1. 2. The shaft 1 applies a strong force to the belt 4 to wind and unwind it, so it requires strength.
As shown in FIG. 3, a round bar-shaped material 5 is hot-forged and cut into one piece, and a gear 2 is attached to the shaft 1 via a gear attachment member 6 as shown in FIG. .

As mentioned above, in order to integrally mold the shaft 1, the second
The material 5 shown in figure (Δ) is produced by hot forging in four steps (B).
As shown in the figure, fixed shaft portions 7°8 are provided protrudingly at both ends, and four portions 9 and 10 are recessed on the opposing outer circumferential portions of the solid shaft portion,
The bottom surface of the groove is cut out, and then the outer circumferential portion of the shaft 1 and the fixed shaft portion 7.8 are finished in cutting steps 4 and 5, and the side surface is processed in step 7 to form the shapes shown in C) and <D). Shaft 1 has been manufactured. The shape of the portion 18 is technically difficult to process because it has a complicated shape as shown in the figure, with wide openings at both ends and a narrow central portion in order to lock the tip end 4a of the belt 4.

As mentioned above, since the shaft 1 is formed from a heavy round steel material, it has the drawback of being extremely heavy.
There were drawbacks such as a large number of processing steps, poor productivity, high costs, and poor shape and dimensional accuracy due to hot forging.

This invention aims to eliminate the above-mentioned conventional drawbacks, and aims to improve productivity and reduce costs by reducing rough grinding and reducing the number of processing steps, and,
The purpose is to improve shape and size accuracy.

20 (and use) This invention has been made 41 to achieve the above object, and the core part of the shaft is made of a steel material such as high carbon steel that has strength, and the outer part is made of a steel material that is not processed. By forming the shaft with a light metal that is easy to use and using a composite processing method of different metals, it is possible to reduce the shape of the shaft, and by forming the groove part in advance on the shaft core member and outer member, it is possible to create a slot with a complex shape. To provide a method for processing a shaft, which is characterized in that it is possible to extremely easily form a shaft with good dimensional accuracy, and also to easily form it on stepped shaft portions at both ends.

Specifically, the shaft manufacturing method according to the present invention involves continuously pressing a flat drawn steel material with a rectangular cross section to form a long slotted hole and holes for driving the outer member on both sides of the slotted hole. At the same time as side cutting and cutting 11 L, a stepped portion is formed on both sides, and a shaft core member of a predetermined length having the above-mentioned slot and a driving hole is formed in the center, while a circular arc with a semicircular arc cross section is formed. The outer member is formed by cutting and processing a light metal drawn material with a concave portion on the surface into a predetermined length, and the outer member is assembled on both sides of the shaft core member, and the outer member is driven into the above-mentioned driving hole to be integrated. The assembled body is inserted into the die, and a pair of punches are pushed into the concave portion of the outer member to plastically flow the light metal in the core, and the length of the concave portion is By filling both ends in the width direction to form the side walls of the concave portion and pushing the surplus metal into the slot in the shaft core, the surplus metal in the slot is punched out using a press, thereby forming stepped shaft portions at both ends. It is characterized by having a slot in the center as well as a J-ru.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to examples shown in the drawings.

The shaft core part is formed from a drawn steel material 10 made of high carbon steel shown in FIG. 4 and drawn into a flat rectangular cross-section, while the outer part of the shaft core part is made of a light metal material shown in FIG. 5. Light metal drawn material 11 obtained by drawing into the shape shown in the figure
It is more shaped.

The above-mentioned drawn steel material 10 is processed sequentially from (a) to (d) in the figure using a press machine, and first, as shown in (a), the center part is A blow-out process is performed to form a long slot 12 in the horizontal direction in the figure.Next, as shown in the figure, holes for driving light metal are placed at intervals on both upper and lower sides of the slot 12. One hole 13 is bored.

Next, as shown in (c), the steel material between the adjacent slots 12 is cut out from both the upper and lower sides into steps as shown in the figure to form a stepped portion 14 with a small cross-sectional area and a stepped portion with a small cross-sectional area. 15 is formed.

Next, as shown in (D), the tip of the stepped portion 14 that contacts the stepped portion 15 is cut and processed, and the slotted hole 12 is cut to a predetermined length as shown in (E). A shaft core member 1G having stepped portions 14 and 15 is sequentially formed on both sides of the hole 131.

The light metal drawn material 11 has one side 11a that is flat and the sacral side 11.
1) Machining the material 11 into a circular arc shape with a concave part i1c in the center of the arc, cutting and processing the material 11 at predetermined intervals, and sequentially cutting the material into a predetermined length. An outer member 17 is formed.

After forming the shaft core member 16 and the outer member 17 as described above, as shown in FIG. The outer members +7A and 17B are driven into the parts of the shaft core member 16 that are in contact with both sides of the center part excluding the stepped portions 14 and 15 on both sides and correspond to the holes 13 of the shaft core member 16, and as shown in FIG. An assembly material 18 is formed by fixing the core member 16 and the outer members 17A and 17B.

Then, as shown in FIG.
Insert the material 18 and remove the stepped portions 14° and 15 on both sides of the shaft core member 16.
And both upper and lower ends of the outer parts I417A and 17B are cut into a die 20.
While supporting the outer members 17A, 17B from side walls (not shown) in the die 20, left and right punches 2+A, 21B having desired groove shapes are operated as shown by arrows in the figure. When the left and right punches 21A and 21B are pushed in,
The protruding parts 21A-1 and 21B-1 are pushed into the middle part of the recessed part 11c, and as shown in FIG.
Side wall portions 22A and 22B are formed at both upper and lower ends of 1c.

Further, the pushed-in surplus metal 23 is removed from the slot 1 of the shaft core member 16.
2, it is flowed as shown in FIG. Furthermore, at this time, depending on the shape of the punches 21A and 21B, -C1 outer part UI7
A and 17B cover the outer circumferential surface of the shaft core member 16 except for the stepped portion 14, and at the same time, flow the light metal so as to fill the hole created by the assembly by driving, and form the shape shown in FIG. 10. do. In this way, due to the plastic flow of the light metal, the shaft core member 1G and the outer members 17A and 17B made of light metal are formed.
Pressure welding: strengthens the close contact.

After the forging, the surplus light metal 23 filled in the 1-'1 hole 12 of the shaft core member 16 is punched out using a press.
A belt locking slot 24 is formed.

By the above-described processing method, as shown in FIG. In this case, a shaft 33 is manufactured which passes through a full hole 24 for belt engagement, which is widened at both end openings and narrowed at the center.

The shaft 33 manufactured by the method 1 above is manufactured as shown in FIG. 3, and one end of the belt 4 is inserted and locked into the slot 24 for use.

Note that the present invention is not limited to the shaft for a glue tractor in the above embodiment, but can be suitably used to manufacture a shaft having a groove along the axis and a stepped shaft at both ends. , is more preferably employed when the cross-sectional shape of the slot is complex.

In addition, the stepped shaft portions at both ends are both prismatic or circular (1
Needless to say, it can be done in a similar manner.

l As is clear from the above explanation, according to method a, only the shaft core part is made of strong high-carbon material, and the other outer parts are made of strong carbon. Since it is made of light metal, the eave of the shaft can be greatly increased.In addition, the shaft core member is formed with a slotted hole by punching and covered, and a hole that communicates with the slotted hole is made of an easily machined light metal. Because of the forging and punching C' shadow formation, the slots can be machined with high shape and size accuracy.

In addition, the number of processing steps is reduced compared to conventional methods, productivity is improved, costs are reduced, and energy savings are achieved.

[Brief explanation of drawings]

Fig. 1 shows the jab 1 for a beam tractor; A) is a perspective view; (B) is a perspective view with the belt fully wound; Fig. 2
A), (B), and (C) are process diagrams showing the conventional manufacturing method. Figure 2 (D) is a sectional view taken along the line D-D in Figure 2 (C), and Figure 3 is a diagram showing how the gear is assembled to the shaft. FIG. 4 is a drawing showing the process of forming the shaft core member according to an embodiment of the present invention, FIG. 5 is a drawing showing the process of forming the outer member, and FIG. A perspective view showing the state in which the members are joined, Fig. 7 (Δ
) is a perspective view showing the state in which the shaft core member and the outer member are fixed, FIG. 7(B) is a sectional view of FIG. 7(A), and FIG. 8 is a sectional view showing the state of processing in the die. , FIG. 9(A) is a horizontal sectional view showing the process of forming the slot side wall by punching, and FIG. 9(B) is a vertical sectional view of FIG.
Figure <A) is a perspective view showing the forging process, Figure 10 ([3) is a vertical sectional view of Figure 10 (A), and Figure 10 (C) is a perspective view of the forging process.
FIG. 11A is a horizontal sectional view of FIG. 11A, and FIG.
B) is a perspective view of FIG. 11(A>, FIG. 11(0) is a vertical cross-sectional view of FIG. 11(A), and FIG. 11(D) is a horizontal cross-sectional view of FIG. 11('A). It is a diagram. -16...Axis member, 17A, 17B...Outer member, 24...Slot hole.Patent applicant: Tokai Rika Denki Seisakusho Co., Ltd. Patent attorney: 2 idiots Figure 8 Figure 9
Figure 10 Figure 11 Figure 7A and →

Claims (1)

[Claims] (1) A flat drawn rope material with a rectangular cross section is continuously pressed to form a long slot and holes for driving the outer member on both sides of the slot, and side cuts and cutting are performed. A shaft core member of a predetermined length is formed with stepped parts on both sides and a hole for driving the slotted hole in the center part, while a light metal material having a semicircular arc cross section and a concave part on the arc surface is formed. cutting and processing the material to a predetermined thickness to form an outer member, combining the outer members on both sides of the shaft core member and driving the outer members into the l insertion hole and fixing them together to form an assembled body;
The assembled body is inserted into a die, and a pair of punches are pushed into the recessed portion of the outer member, and the light metal of the core is filled with plastic flow V1 at both lengthwise ends of the recessed portion, thereby forming the side walls of the recessed portion. Also, by pushing surplus metal into a slot in the shaft core part and then punching out the surplus metal in the slot with a press, it is characterized by having stepped shaft parts at both ends and a slot in the center part. Shaft processing method.