JPH03118937A - Forging method for gear parts having oil groove - Google Patents

Abstract

PURPOSE:To efficiently forge the gear parts having oil groove by forming the oil groove with utilizing the shearing resistance force to deburr on the other end surface of the gear parts which was formed of the work and has the oil groove of its one side only and is burred on its center. CONSTITUTION:The work rough forging W1 is formed by forging the round steel with the rough forging die (not shown in fig.). This rough forging W1 is set on the finishing die D2 and is forged between the outer punch DA1 having an oil groove part, the inner punch DA2 of the upper die D21 and the outer die DB1, the inner die DB2 of the lower die D22. The shaft hole part having the oil groove part A of its upper end surface A2 only and the burred center W21 is formed of finishing with these. The first gear W2 with burred center which is obtained with this is set to the deburring die D3 and is forged between the upper die D31 and the lower die D32 having the oil groove part. The center burr W21 of the shaft hole part is removed with this and at the same time, the oil groove part B is formed at the lower end surface B2 with utilizing this shearing resistance force of this center deburring. Therefore, the first gear W with the shaft hole part having respective oil groove part A, B on the upper and lower both end surfaces A3, B3 is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to forging gear parts, and in particular, to a method for forging gear parts having oil grooves on both end faces [Prior Art] Conventionally, the present invention relates to a forging method for gear parts having oil grooves on both end faces. The oil grooves of the gear parts used can be provided by cutting, or by simultaneously forming the outer shape and the shaft hole during forging of the workpiece. However, the method of providing by cutting has problems in that the yield of materials decreases and the number of man-hours increases. In addition, the method for forming the gear parts during forging is detailed: a roughening process in which the rough part of the workpiece is formed, a finishing process in which the outer shape, the shaft hole with core burrs, and the oil grooves on both end faces are simultaneously formed, A burr removal process is performed in order to remove core burrs from the shaft hole. Therefore, in the deburring process, in order to prevent deformation of the oil groove of the gear part formed in the previous process, the oil groove is positioned at the corresponding position of the core deburring die on at least one end surface, and the shaft hole is I was deburring the core of the section. Therefore, there was a problem that the positioning work of the oil groove part was time consuming and the number of man-hours for the stamping work was increased.

[Problem that the invention seeks to solve]

In view of the above-mentioned problems, the present invention has been developed so that the oil groove of the gear part is placed in the corresponding position of the core deburring die during the deburring process during forging.
It is an object of the present invention to provide a forging method for forming an oil groove or a shape similar to an oil groove in a gear component without requiring positioning work of the oil groove, thereby reducing the time required for stamping work.

[Means to solve the problem]

In the method for forging a gear part having oil grooves on both end faces according to the present invention, in the finishing process of the gear part forging process, the oil groove part is formed only on one end face, and the core burr of the shaft hole is removed in the next process. In the deburring process, the other end surface is formed using the shearing resistance during core deburring, thereby eliminating the need for positioning the oil groove of the gear part. That is, in forming and forging a gear part having oil grooves on both end faces, there is a roughening process in which the rough part of the workpiece is formed, and a finishing process in which an outer shape having the shape of the oil groove on one end face and a shaft hole with a core burr are simultaneously formed. and a deburring step in which the core burr of the shaft hole portion is removed and the shape of the oil groove portion of the other end surface is simultaneously formed using the shearing resistance during core deburring.

[Function] According to the above configuration, in the deburring process, the shearing resistance force during core deburring is applied only to the core burr and the oil groove on the other end face, and is applied to the oil groove on the end face formed in the previous process. Since it is not pressurized, it does not deform, so there is no need to perform positioning work for the oil groove.

Therefore, compared to the conventional method, in the deburring process, there is no need to position the oil groove formed in the previous process, so the work in the deburring process becomes easier and the stamping time can be shortened. In order to form the oil groove using shear resistance during core burr removal, it is sufficient to make the shear resistance during core burr removal larger than the force used to form the oil groove, and the shear resistance can be adjusted by adjusting the thickness of the core burr. It can change depending on the situation.

〔Example〕

An embodiment of the method for forging a gear component having an oil groove according to the present invention will be described below.

The forging process of the gear parts used in this example includes a roughing process of forming a rough area, a finishing process of forming an outer shape with an oil groove on one end face and a shaft hole with a core burr, and a forming process of forming an oil groove on the other end face. The fast gear W is formed through a deburring process for removing core burrs from the shaft hole, and as shown in FIG.
is 58mm, height dimension H1 is 48mm, upper end surface oil groove part A
The groove inside dimension L6 is 8 mm, the depth dimension L7 is 2.4 mm,
The dimension L3 between the re-drawn grooves is 25 mm, the groove width L8 of the lower end surface oil groove portion B is 10 mm, the depth dimension L9 is 3 mm, the dimension L4 between the re-drawn grooves is 25 mm, and the material is 5CR420.

Next, a method for manufacturing the fast gear W will be explained in the order of forging steps.

(Rough ground process) First, the round steel material WO for forging the fast gear W is set perpendicularly to the center of the upper surface of the lower mold D12 of the rough ground mold DI as shown in FIG. (see the left half), and the upper mold Dll is operated to form a drum-shaped wasteland W1 (see the right half in the figure). Said round steel material W
The dimensions of O are 50mm in diameter and 107mm in length.
It is. Further, the diameter of the waste land W1 is 106 mm.

The height dimension is 24 mm.

(Finishing process) Next, as shown in FIG.
Set the outer die DBI at the center of the upper surface of No. 22 (see the left half in the figure), operate the upper die D21, and press the inner punch DA2 with oil groove of the upper die D21, the outer punch DAI, and the lower die D2.
2 knockout die DB2. Using the outer die DBI, the outer shape having the oil groove A on the upper end surface A2 and the shaft hole with the core burr W21 are simultaneously molded to form the fast gear W2 with the core burr W21 (see the right half in the figure).

The dimensions of the fast gear W2 with the core burr W21 are such that the core burr W21 has an outer diameter of 41 mm and a thickness of 19 mm, and the other outer dimensions are the same as those described in FIG. 4 above.

(Deburring process) Next, using the circuit's 200-ton deburring press, the fast gear W2 with the core burr W21 is sealed onto the center upper surface of the lower mold D32 with the oil groove of the deburring mold D3, as shown in FIG. (See the left half in the figure), the upper die D31 is operated to simultaneously remove the core burr W21 and form the oil groove B on the lower end surface B3, thereby completing the forging of the fast gear W (see the right half in the figure). At this time, since no operating pressure is applied to the oil groove A of the upper end surface A3, the core oil groove A is not deformed.

Forming of the oil groove part B in the deburring process utilizes the shear resistance force during core deburring, so the forging machine does not require a complicated double traction device and can be formed with a simple machine.
There are also economic effects.

(Effects of the Invention) As explained above, in the method for forging a gear part having an oil groove according to the present invention, the oil groove on the lower end surface is formed in the deburring process which is the final process of the forging process, so the oil groove is In order to prevent deformation of the groove, the oil groove can be formed without the need for positioning the workpiece to the corresponding position of the deburring die.

Therefore, the time for positioning the workpiece can be omitted, and the time for stamping the gear parts can therefore be shortened.

[Brief explanation of drawings]

The figures are all used in the examples, and Figure 1-
A is a plan view of the workpiece, the opening is a cross-sectional view of the rough ground type, the left side of the center of the figure shows the state of the workpiece before forming, the right side shows the state of the workpiece after forming, and C is a bottom view of the workpiece. FIG. 2A is a plan view of the workpiece, the opening is a sectional view of the finishing die, the left side of the center of the figure shows the state of the workpiece before molding, the right side shows the state of the workpiece after molding, and C is a bottom view of the workpiece. Figure 3-A is a plan view of the workpiece, the opening is a cross-sectional view of the burr removal die, and the center left side of the figure is the workpiece before forming;
The right side shows the state of the workpiece after molding, and C is a bottom view of the workpiece. FIG. 4 is a sectional view of the forged product. In the diagram, W is fast gear, WO is round steel, Wl is rough ground, W2
is a fast gear with a core burr, W21 is a core burr, A is an oil groove on the upper end surface, B is an oil groove on the lower end surface, AO, Al, A2.
A3 is the upper end surface of the workpiece, BO, Bl, B2. B3 is the lower end surface of the workpiece, Dl is the rough ground mold, Dll is the upper mold, Dl2 is the lower mold, D2 is the finishing mold, D21 is the upper mold, D22 is the lower mold, D
AI is outer punch with oil groove, DA2 is inner punch,
DBI is an outer die, DB2 is an inner die, D3 is a deburring die, D31 is an upper die, and D32 is a lower die with an oil groove. 1st lesson '1; 20 in the afternoon

Claims (1)

[Claims] In forming and forging gear parts that have oil grooves on both end faces,
A roughening process in which a rough surface of the workpiece is formed, a finishing process in which an outer shape having the shape of an oil groove on one end face and a shaft hole with a core burr are simultaneously formed, a core burr removal from the shaft hole and an oil groove on the other end face. A method for forging a gear part having an oil groove, the method comprising sequentially performing a deburring step in which the shape is simultaneously formed using the shear resistance of deburring the core.