JPS5852732B2 - Method for simultaneously manufacturing materials for inner and outer rings of conical roller bearings with model numbers that overlap in size - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for simultaneously manufacturing raw material for inner and outer rings of conical roller bearings of model numbers with overlapping dimensions from a bar material, that is, a small inner diameter of the outer ring is smaller than a large flange diameter of the inner ring, and the inner and outer rings are simply manufactured by press punching. This invention relates to a manufacturing method by simultaneous molding of materials for the inner and outer rings of a non-separable conical roller bearing in which the rings cannot be separated.

Conventionally, the material for the inner and outer rings 1.2 of the conical roller bearing shown in FIG. 1 has been machined from pipe material or bar material.

In the drawing, 3 is a roller and 4 is a retainer. However, pipe materials are more expensive than rod materials, and the material made from rod materials has the disadvantage that there are many chips and material retention is poor.

In general, the inner and outer rings of conical roller bearings are broadly divided into model numbers in which the outer ring's small inner diameter is larger than the inner ring's large flange diameter (separable type) and model numbers in which the outer ring's small inner diameter is smaller than the inner ring's large flange diameter (non-separable type).

In the former case, as shown in FIGS. 2 to 4, the small inner diameter of the outer ring 11 is larger than the large flange diameter d1 of the inner ring 12 by a predetermined amount, so after the set forging 13 of the inner and outer rings, the press punch 1
A method of separating in 4 can be adopted.

In the drawing, 15 is a separation die, and 16 is a bottom waste portion.

Therefore, inexpensive bar materials can be used with good yield in manufacturing the materials 11' and 12' for the inner and outer rings, and this method has become extremely popular in recent years.

On the other hand, the latter has an outer ring 2 as shown in FIGS. 5 to 8.
Since the small inner diameter D2 of the inner ring 22 is smaller than the large flange diameter d2 of the inner ring 22 by a predetermined amount, it is possible to forge the inner and outer rings as a set, but a separation method using a press cannot be adopted.

Therefore, the materials for the inner and outer rings of these model numbers can be formed by a separate forging method for the outer ring material 21' and the inner ring material 22' as shown in FIG. 6, or by a separate forging method as shown in FIGS. 7 and 8. , a method is adopted in which the inner and outer rings are forged as a set 29 and then cut off and separated.

In the drawing, 24 is a bottom scrap, and 26 is a cut-off scrap.

Further, 26 is a cutting tool. However, the separate forging method for the inner and outer rings requires a large number of steps because the outer ring 21' and the inner ring 22' are forged separately, and has the disadvantage that both the outer ring and the inner ring produce bottom scraps, resulting in a poor material yield.

On the other hand, the parting separation method after forging a set of inner and outer rings requires a turning separation process as shown in FIG. 8, and has the disadvantage that the material yield due to parting is poor.

The present invention was developed by investigating the problems in view of the drawbacks of the above-mentioned conventional methods, and will be described below with reference to the embodiments shown in FIGS. 9 to 12.

In the drawings, 30 is an outer ring, and 32 is an inner ring.

That is, as shown in FIG. 9, the inner and outer rings 30 and 32 that are the object of the present invention have a final shape in which the small inner diameter D2 of the outer ring 30 is smaller than the large flange diameter d2 of the inner ring 32 by a predetermined amount. The inner diameter is set to a size D2' that allows set forging 33 as shown in chain lines 30' in FIG. 9 and in FIG. 10.

Then, they are punched and separated using a press punch 35 shown in FIG.

In the drawing, numeral 34 is a bottom scrap, and numeral 36 is a separation die.

Next, among the materials 30'' and 32' for the inner and outer rings which have been largely forged and separated in this way, the material 30'' for the outer ring is the first material for the outer ring.
By pushing through a conical hole mold 39 with a punch 38 attached to a press ram 37 shown in FIG. 2, it is compressed in the radial direction and formed into the required size.

As an example of the specific molding conditions, when molding an annular article with an outer diameter of 80 mm and a wall thickness of 24 mm to an outer diameter of 72 mm and a wall thickness of 26 mm, applying a punch load of approximately 12 yuan will result in cold forming. The object of the present invention can be achieved.

In addition, in the drawing, 40 is a pressure receiving plate, 41 is a punch holder, and 42
is the mold holder, 43 is the lower plate, 44 is the bolster, 45
is a bet.

As explained above, in order to simultaneously manufacture materials for the inner and outer rings of a conical roller bearing of a model number in which the small inner diameter of the outer ring is smaller than the large flange diameter of the inner ring, the invention first enables separation using a press. The outer ring small inner diameter is set slightly larger than the inner ring large flange diameter, the inner and outer rings are forged and formed as a set, and after forging, the materials for the inner and outer rings are separated in a press. This method involves simultaneously manufacturing materials for the inner and outer rings of conical roller bearings with model numbers with overlapping dimensions, in which the material for the outer ring is compressed in the radial direction through a conical hole mold to the regular size. Taking advantage of the press separation method that is used to simultaneously manufacture the inner and outer rings of larger separate conical roller bearings after forging a set of inner and outer rings, bar stock can be formed simultaneously with a high yield.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing inner and outer rings for a conical roller bearing assembled with rollers and a cage. FIG. 2 is a sectional view showing the dimensional relationship between the inner and outer rings of a model number in which the outer ring's small inner diameter is larger than the inner ring's large flange diameter. 3 and 4 are cross-sectional views showing a method of manufacturing the materials for the inner and outer rings shown in FIG. 2. FIG. 5 is a sectional view showing the dimensional relationship between the inner and outer rings of a model number in which the outer ring's small inner diameter is smaller than the inner ring's large flange diameter. FIGS. 6, 1, and 8 are sectional views showing two conventional methods of manufacturing the inner and outer rings shown in FIG. 5. FIGS. 9 to 12 are drawings showing the dimensional relationship between the inner and outer rings and the manufacturing steps according to the present invention, respectively. 30″'・・・Final dimension outer ring material, 30″・
...Material for outer ring with intermediate dimensions, 32'...
Inner ring material, 33... Material for set forged inner and outer rings, 34... Bottom scrap, 35... Press punch, 36... Separation die , 37...
... Press Ram, 38 ... Punch, 39.
... Conical hole type, 40 ... Pressure receiving plate, 4
1... Punch holder, 42... Mold holder, 43... Lower plate, 44... Bolster, 45... Bed.

Claims (1)

[Claims] 1 Conical roller bearings with a model number in which the small inner diameter of the outer ring is smaller than the large flange diameter of the inner ring.In order to simultaneously manufacture the materials for the inner and outer rings from bar stock, first, the small inner diameter of the outer ring is set to the inner ring so that they can be separated using a press. The inner and outer rings are set slightly larger than the diameter of the large flange, and the inner and outer rings are forged as a set. After the forging, the materials for the inner and outer rings are separated using a press. Then, among the separated materials for the inner and outer rings, the material for the outer ring is adjusted to the regular size. A method for simultaneously manufacturing materials for inner and outer rings of conical roller bearings having model numbers with overlapping dimensions, characterized in that the material is compressed in the radial direction through a conical hole mold.