JP3787092B2 - Non-cutting manufacturing method of member having hub - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a member non-cutting manufacturing method, and more particularly, to a gear component including a hub.
[0002]
BACKGROUND OF THE INVENTION
The hub has a hole with a step as a result of cold forming by a compression method using a rotary metal hollow body having a through hole. At least one rotating pressure roller forms a hub that extends substantially radially in the plane of the hollow metal body. Therefore, the pressure roller is supplied radially from the outside to the inside, and at least intermittently and temporarily engages the metal hollow body, and the hub is manufactured by such a method.
[0003]
A method for manufacturing this hub using a compression process is known from patent application WO 94/20235. This method is further developed in German patent application DE 44 44 526 C1, and according to the teaching of this application, the outer periphery of the sheet plate is supported during the compression process, thereby providing an end lining for the outer end of the hollow metal body. To do.
[0004]
Furthermore, from US Pat. No. 5,951,44 and the family patent belonging to this document, a method of forming a so-called “blind hole” intended for a stepped opening, ie a pulley hub, is known. Some patch blocks provide a patch block end / ring secured to the outer periphery of the metal hollow body held in an end lining on the metal hollow body, and a portion of the patch block providing a through hole in the metal hollow body, Fits the inner diameter of the hollow metal body. Therefore, the provision of the hub leaves the inner web in the hub, and the stepped hole that the machine can face is required to provide the specific shape at the end of the inner contour as required by the design in various applications. Form. The shape of the stepped hole in the hub after compression always matches the thickness of the metal hollow body before ausforming in this region.
[0005]
In light of available technology, the object of the present invention is to provide a method of manufacturing a hub having a stepped hole shape that is different from the initial thickness of the hollow metal body, thereby leaving the available technology. it can.
[0006]
[Means for Solving the Problems]
The object of the invention is achieved by the features of claim 1. A material web that extends substantially inwardly away from the hub is formed at the inner circumference of the hub so that at least a portion of the patch block is at a distance from the metal hollow body during at least the ausforming of the hub. Provided. On the other hand, during the formation of the hub, the material of the metal hollow body flows through the gap between the metal hollow body and the patch block, thereby forming a stepped hole.
[0007]
As long as the patch block is placed directly on the hollow body prior to ausforming to prevent material from flowing into the region of the stepped hole formed, the present invention is disclosed in US Pat. Different from 422. Contrary to the teaching of this document, the arrangement allows the material to flow even in the region of the inner diameter of the hub, not the position of the patch block in the hollow body. On the other hand, it is possible to give various shapes to the hub in the region of the stepped hole, and the various shapes are adapted to the shape of the patch block in the stepped hole.
[0008]
Thus, according to a preferred embodiment of the present invention, the patch block and / or pin expands the diameter of the area of the through hole outside the through hole, so that the hub When formed, the web area increased, which was not possible with US Pat. No. 5,951,422.
[0009]
According to another embodiment of the invention, the patch block and / or pin is provided in a region of the through hole having a diameter smaller than the diameter of the through hole, so that when forming the hub, the metal hollow body The material flows inwardly from the inner diameter of the hub and the hub web diameter and / or height decreases with respect to the initial thickness of the hollow metal body. If the patch block penetrates in a stepped area and the metal hollow body fits into a large through hole, the web is thinner with respect to its thickness and smaller with respect to its diameter than the original material of the metal hollow body It is also amazing what you can do. Again, this was not possible with the teaching of US Pat. No. 5,951,422.
[0010]
With respect to the technology provided by US Pat. No. 5,951,422, the number of embodiments can be greatly increased when manufacturing a hub from the form of a metal hollow body without making the manufacture of the hub more complex. . This is because the material "flows" semi- "automatically" into the region between the metal hollow body and the patch block located at a predetermined distance from the metal when the hub is manufactured.
[0011]
The inner circumferential web can take various shapes in the stepped hole region using the present invention. If the patch block has a conical shape (at least in the region of the portion that penetrates the through hole), the web will have a conical shape in this region. Similarly, other contours, for example different types of different curves or gradations, can be formed in the inner peripheral region.
[0012]
Other features of the claims are described by means of other advantageous embodiments of the invention.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0014]
1 to 3 show a metal hollow body (sheet plate) 1 whose outer periphery is held by a tool 3, while the metal through-hole 5 is formed of a metal through-hole 5 around a blank. It is penetrated by a stepped patch block 7 having a conical centering pin 8. Since the step 9 is formed at a certain distance from the sheet metal hollow body, the hub is provided with a shoulder portion 13 that restricts starting from the metal hollow body and extending radially from the outside to the inside, and is pressed when the rotary pressure roller 11 is moved. Not only the material is pressed between the patch block 7 and the hollow metal body 3. This provides a stepped hole 17 in which the height of the web S is now thicker than the initial thickness B of the metal hollow body. The stepped hole 17 is also formed using the material of the metal hollow body 1, while the material flows or is compressed from the metal hollow body 1 to the region of the stepped hole.
[0015]
Conversely, FIG. 2 shows a web height S 2 that is less than the thickness B of the hollow metal body 1. On the other hand, the diameter of the stepped hole 17 is smaller than the diameter of the through hole of the metal hollow body 1. For this embodiment, the metal hollow body 1 is fixed to the tool 3 with its outer diameter and sent to the through hole at the step 9. The step 9 may have a reduced diameter with respect to the initial diameter of the hollow metal body, forming a presser end or stepped hole 17 having a reduced height web in the stepped hole 17. It becomes possible.
[Brief description of the drawings]
1a shows a hub manufacturing method according to a first embodiment of the invention. FIG.
FIG. 1b shows a hub manufacturing method according to a first embodiment of the present invention.
FIG. 2a illustrates a hub manufacturing method according to a second embodiment of the present invention.
FIG. 2b shows a hub manufacturing method according to a second embodiment of the present invention.
FIG. 3a shows an embodiment of a hub manufacturing method according to available technology.
FIG. 3b shows an embodiment of a hub manufacturing method according to available technology.
[Explanation of symbols]
1 Metal Hollow Body 3 Tool 5 Through Hole 7 Patch Block 8 Centering Pin 9 Step 11 Pressure Roller 13 Shoulder 15 Hub 17 Stepped Holes S1, S2 Web Width B Metal Hollow Body Width

Claims (7)

A non-cutting method of manufacturing a hub for have a hole having a step, the method,
Providing a metal hollow body having a through hole ;
In order to create a stepped region moved from the plane of the top surface of the metal hollow body , a patch block is provided in the through hole , and a part of the patch block is kept at a certain distance from the metal hollow body. Step and
Using at least one rotating pressure roller, a portion of the said hub by at least one rotating pressure roller comprising the steps of cold-forming radially toward said through hole, said metal hollow body and the patch block how to the step a region between, seen write material to flow from the hollow metal, including the inner periphery of the hub, and forming a hole having a step with the material web. The method of claim 1 , wherein the patch block has at least two different diameters in a portion of the patch block . It said patch block has a step as part of the patch block The method of claim 1. The method of claim 1 , wherein the patch block has at least one contour of a partial conical shape and a curved shape. Said patch block, or one of the pin formed separately from the patch block, passing through the through hole of the metallic hollow body, The method of claim 1. Wherein one of the patch block and the pin is such that said web thickness is greater than the initial thickness of the metal hollow body, having a diameter extending in the region of the through hole, according to claim 5 Method. Wherein one of the patch block and the pin is to flow from the inner diameter of the material is the metallic hollow body inwardly, has a diameter smaller than the diameter of the through hole in the region of the through hole, of the web the thickness is smaller than the thickness of the initial of the metal hollow body, the method of claim 5.

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