JP2000190048A - Helical coarse shape tooth finish molding method and device usable therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helical coarse shape tooth finish molding method being advantageous for securing reliability, and a device which can be used for it, while adopting a mechanical system, when a phase related to a helical coarse tooth of a work is made to be matched. SOLUTION: A punch 6 is descended towards a work 1 under a condition that a tip end part of a guide operation unit 7 is projected from a bottom face of the punch 6. Thereby, a tip end part of the guide operation unit 7 abuts with the work 1, and the guide operation unit 7 is relatively rotated in a peripheral direction of the work 1 accompanied by the abutment. Accompanied by the relative rotation, the tip end part of the guide operation unit 7 is inlaid in a tooth groove 1k of the work 1 with an energized force of an energizing part 72. Thereafter, the punch 6 is relatively moved in a peripheral direction so that a peripheral direction phase matching of a punching tooth 64 of the punch 6 and a helical coarse shape tooth 1d of the work 1 is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finish forming helical coarse teeth and an apparatus usable for the method. INDUSTRIAL APPLICABILITY The present invention can be used, for example, for finish forming of a helical coarse tooth used as a transmission gear of a vehicle or the like.

[0002]

2. Description of the Related Art In the industry, spiral helical teeth are widely used. Further, a work having both helical teeth and straight teeth is widely used. In finish forming the helical coarse teeth of the work, it is necessary to accurately match the circumferential phase of the helical coarse teeth of the work with the circumferential phase of the counterpart such as a die or a punch.

Therefore, conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2-63633, a work having helical coarse teeth, a punch, a vertically movable lifting plate for holding the punch, and a helical groove. In a technique using a rotatable die having a molding cavity having a shape-forming tooth and a die holder for holding the dice so as to be rotatable in a circumferential direction, as shown in FIGS. As means for rotating, the pressing body 102 is held in a hanging state on an elevating plate 100 arranged above the die 200, and a screw 3
00 is provided, and a tooth portion 210 that meshes with the tooth portion 302 of the screw 300 is formed on the outer periphery of the die 200.

According to this publication technology, 700 to 950 ° C.
The heated workpiece is placed on the die 200, and then the lifting plate 100 is lowered together with the punch, and the workpiece is pushed into the molding cavity of the die 200 by lowering the punch. At this time, since the elevating plate 100 descends together with the punch, the upper end 300a of the screw 300 is pressed by the pressing body 102 which descends at the same time, and the screw 3
00 is rotated together with the tooth portion 302 in the circumferential direction, and as a result, the die 20
0 is to be rotated.

[0005]

The above-mentioned Japanese Patent Application Laid-Open No. 2-6 / 1990
According to the technology disclosed in Japanese Patent No. 3633, although the mechanism for rotating the die 200 is a mechanical system that easily ensures reliability even in a severe use environment, the screw screw 300, the tooth portion 302, and the tooth Since the gear mechanism of the portion 210 is employed as the main mechanism, if a burr, dust, or the like generated during molding is caught, the main mechanism is likely to be damaged, and the reliability is not always satisfactory.

Optical systems such as laser beams and photoelectric tubes,
Alternatively, an optical system or an electric system in which phase information on a helical coarse tooth of a work is detected by using an electric system such as an electric sensor and a phase is matched by rotating a dice with a motor may be considered. However, the above-mentioned optical system and electric system are easily affected by burrs, dust and the like, and their reliability is not always satisfactory. In particular, when the finish forming is forging finish forming, in addition to problems such as burrs and dust, there is also a problem of impact due to a large forging pressure, and the optical method and the electric method, which are weak to shock, have high reliability. Is not always satisfactory. Therefore, in order to ensure reliability, it is preferable to perform phase matching on the helical coarse teeth of the work by a mechanical method.

The present invention is different from the above-described method in that the helical coarse teeth of the workpiece are aligned in the circumferential direction with respect to the helical coarse teeth. It is an object of the present invention to provide a finish molding method and an apparatus that can be used for the method.

[0008]

According to a first aspect of the present invention, there is provided a method of finish-forming a helical coarse tooth having a plurality of helical groove-shaped teeth formed at a predetermined pitch. A work having a plurality of helical coarse teeth forming a helical shape formed with a pitch corresponding to the molding teeth of the die, and a pitch corresponding to the pitch of the helical coarse teeth of the work A punch having a plurality of helical punch teeth and being rotatable in the circumferential direction relative to the work and capable of pressing the work, and an elevating unit for raising and lowering the punch with respect to the die. Performs a punch / work phase matching operation to match the circumferential phase of the workpiece and the helical coarse teeth of the workpiece, and then pushes the workpiece into the molding cavity of the die as the punch descends by the lifting / lowering unit. In a method for finish-forming a helical coarse tooth for performing a finish-forming operation for finishing-forming a helical coarse tooth of a work with a molding tooth of a die, the punch has a helical tooth groove between two adjacent punch teeth. The shaft-like guide operation member is provided so as to be able to advance and retreat along the tooth space and is inclined with respect to the center axis of the punch, and the tip of the guide operation member is inclined with respect to the center axis of the punch. It has a biasing part that urges the guide operator so as to protrude from the lower surface of the punch and allows the guide operator to retract to the back of the tooth space. By lowering the punch toward the work with the tip of the armature protruding, the tip of the guide manipulator is brought into contact with the work, and with the contact, the guide manipulator is retracted into the tooth space of the punch. And work around The guide operation element urged by the urging portion is fitted into the tooth groove of the work according to the relative displacement, and then the punch is rotated relative to the work by the guide action of the guide operation element. In addition, the phase of the punch teeth of the punch and the helical coarse teeth of the work are aligned in the circumferential direction.

According to the method according to the first aspect of the present invention, in the punch-work phase matching operation for matching the phase of the punch with the phase of the work, the tip of the guide operating element urged by the urging section is moved. The punch is projected from the lower surface of the punch, and the punch is lowered toward the work in that state. As a result, the tip of the guide operator is brought into contact with the work. With contact,
Since a horizontal component acts on the guide operator, the guide operator is relatively displaced in the circumferential direction while retracting into the tooth space of the punch.

[0010] With the relative displacement, the guide operating element urged by the urging portion enters and fits in the tooth groove of the work. Since the punch is guided relative to the work by being guided by the guide operator, the phase of the punch teeth of the punch matches the phase of the helical coarse teeth of the work. Therefore, according to the method of the first aspect, the phases can be matched by mechanical means.

According to a preferred embodiment of the method according to the first invention, the following is possible. That is, the workpiece may have, in addition to the helical coarse teeth, a plurality of straight coarse teeth extending substantially in parallel along the central axis of the workpiece below the helical coarse teeth. According to this aspect, the die includes a rotatable rotating die having a plurality of helical groove-shaped forming teeth, and substantially along the central axis of the molding cavity disposed below the rotating die. And a fixed die having a plurality of groove-shaped straight forming teeth extending in parallel with each other. According to this aspect, in the finish forming operation, the work is pushed into the forming cavity of the die as the punch is lowered, and the work is not substantially rotated with respect to the fixed die, and the rotating die is moved to the work. While rotating the workpiece, the helical coarse teeth of the work are finish-formed with the forming teeth of the rotating die, and the straight coarse teeth of the work are finish-formed with the straight forming teeth of the fixed die.

(2) A method of finish forming a helical coarse tooth according to a second aspect of the present invention is a die having a forming cavity having a plurality of helical groove-shaped forming teeth formed at a predetermined pitch. Using a work having a plurality of helical rough teeth forming a helical shape formed at a pitch corresponding to the molding teeth of the die, a punch capable of pressing the work, and an elevating unit for elevating the punch with respect to the die, Performs a work / die phase matching operation to match the circumferential phase between the helical coarse teeth of the work and the molding teeth of the die, and then pushes the work into the molding cavity of the die as the punch descends by the lifting / lowering unit. In the finish molding method of the helical coarse teeth for performing the finish molding operation of finishing the helical coarse teeth with the molding teeth of the dies, one of the dies and the elevating part is provided inside the dies. The die has an inclined surface extending along the circumferential direction around the axis and inclined along the circumferential direction around the central axis of the die, and the other of the die and the elevating unit is inclined with the descending of the elevating unit. Has a pressing body that can move relative to the inclined surface along the inclined surface while pressing, and the die can be rotated in the circumferential direction with the relative movement. In this case, the pressing body provided on one side is pressed against the inclined surface provided on the other side, and the pressing is performed by rotating the dice in the circumferential direction with the pressing.

According to the above-mentioned method of the second invention, in the matching operation for matching the phase of the work with the phase of the die, the punch is lowered by the lifting / lowering portion, so that the pressing body provided on one side can be used on the other side. Pressing on the provided inclined surface. The pressing causes a horizontal component force to rotate the dice in the circumferential direction. If the die rotates in the circumferential direction,
The phase of the molding teeth of the die matches the phase of the helical coarse teeth of the work. Therefore, according to the method of the second aspect, the phases can be matched by mechanical means.

According to the preferred embodiment of the method according to the second invention, the following can be performed. In other words, the workpiece may have a configuration in which, in addition to the helical coarse teeth, a plurality of straight coarse teeth extending substantially parallel to the center axis of the workpiece below the helical coarse teeth. According to this aspect, the dice
A rotatable rotating die having a plurality of helical groove-shaped forming teeth, and a plurality of grooves arranged below the rotating die and extending substantially parallel to the center axis of the molding cavity. And a fixed die having the straight molded teeth of the above. According to this aspect, in the finish forming operation, the work is pushed into the forming cavity of the die as the punch is lowered, and the work is not substantially rotated with respect to the fixed die, and the rotating die is moved to the work. While rotating the workpiece, the helical coarse teeth of the work can be finish-formed with the forming teeth of the rotating die, and the straight coarse teeth of the work can be finish-formed with the straight forming teeth of the fixed die.

(3) The finish forming apparatus for helical coarse teeth according to the third invention can be used for carrying out the finish forming method according to the first invention, and includes a plurality of helical coarse teeth formed at a predetermined pitch. A punch which has a plurality of punch teeth, is rotatable relative to the work in the circumferential direction, and is capable of pressing the work,
A die having a molding cavity having a plurality of helical groove-shaped molding teeth, and an elevating unit for elevating and lowering the punch with respect to the die, in a finish molding apparatus for helical coarse teeth, the punch includes: A shaft-like guide manipulator provided in a helical tooth space between two adjacent punch teeth so as to be able to advance and retract along the tooth space and to be inclined with respect to the center axis of the punch; An urging portion for urging the guide operator so as to protrude from the lower surface of the punch while the tip end of the guide operator is inclined with respect to the center axis of the punch, and for allowing the guide operator to retract to the back of the tooth space; It is characterized by having.

According to the finish forming apparatus of the third aspect, the method of the first aspect can be carried out. Therefore, in order to match the phase of the helical coarse teeth of the workpiece with the phase of the punch teeth of the punch, a mechanical method including a guide operator and an urging portion for urging the guide operator to protrude from the punch is used. Can be realized. (4) The finish forming apparatus for helical coarse teeth according to the fourth invention can be used for carrying out the finish forming method according to the second invention, and includes a punch capable of pressing a work, and a plurality of helical-shaped punches. A die having a molding cavity having groove-shaped molding teeth, and an elevating unit for elevating and lowering the punch with respect to the die, in the finish molding device for helical coarse teeth, one of the die and the elevating unit is It has an inclined surface extending along the circumferential direction around the center axis of the molding cavity of the die and inclined along the circumferential direction, and the other of the die and the elevating unit forms an inclined surface as the elevating unit descends. It is characterized by having a pressing body that moves relatively to the inclined surface along the inclined surface while pressing, and generates a driving force to rotate the dice in the circumferential direction with the relative movement.

According to the finish forming apparatus of the fourth aspect, the method of the second aspect can be carried out. Accordingly, the phase of the helical rough teeth of the workpiece and the phase of the molding teeth of the die can be matched by a mechanical method in which the pressing body and the inclined surface are brought into contact with each other. The driving force for relatively rotating the die in the circumferential direction is based on the product of the horizontal component force caused by the pressing force of the pressing body pressing the inclined surface and the distance connecting the center axis of the molding cavity of the die and the inclined surface. Stipulated. Therefore, if this distance is set to be large, it is advantageous to increase the driving force.

According to the finish forming apparatus of the fourth invention, the inclined surface extends along the circumferential direction around the center axis of the molding cavity of the die. The inclined surface may be formed on the die or may be formed on the elevating part. The pressing body may be formed in a die, or may be formed in an elevating part. Further, according to a preferred aspect of the device according to the fourth invention, the following can be performed. That is, the inclined surface is provided at a position radially outward at a predetermined distance from the center axis of the molding cavity of the die, and the pressing body is provided at a position capable of facing the inclined surface. it can.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. (Structure of Embodiment) FIG. 13 shows a metal-based (for example, steel-based) work 1 formed by rough forging by hot forging or warm forging. The work 1 constitutes gears. Work 1
Are a large-diameter plate 1a, a small-diameter plate 1b coaxially connected to the large-diameter plate 1a, a central hole 1c penetrating the large-diameter plate 1a and the small-diameter plate 1b, and a large-diameter plate 1a. A plurality of helical coarse teeth 1d functioning as helical teeth formed in a helical shape (helical shape) at a predetermined pitch on the outer peripheral portion, and at a predetermined pitch located on the outer peripheral portion of the small diameter plate portion 1b. A plurality of straight coarse teeth 1e which are formed and are substantially parallel to the center axis of the work 1 (that is, extend in the vertical direction in the figure);
a plurality of positioning projections 1f formed on the end face
And a ring groove 1h provided on the end face of the large-diameter portion 1a so as to face the straight coarse tooth 1e.

As shown in FIG. 13, the helical coarse tooth 1d
Is larger than the outer diameter A2 of the straight coarse tooth 1e. The protrusion 1f is provided at a fixed angular position with respect to the straight coarse tooth 1e. The helical coarse teeth 1d and the straight coarse teeth 1e before the finish molding are slightly smaller than the dimensions after the finish molding. Therefore, the finish forming according to the present embodiment is a finish forming method in which the flesh of the helical coarse teeth 1d and the straight coarse teeth 1e of the work 1 is overhanged to the target size. In the work 1, the phase of the helical coarse tooth 1d and the phase of the linear coarse tooth 1e are set independently of each other. As shown in FIG. 12, a helical tooth space 1k is formed between two adjacent helical rough teeth 1d in the work 1.

FIG. 1 shows a state immediately before the finish forming of the work 1 is started using a finish forging device functioning as a finish forming device. FIG. 2 shows the main part. FIG. 4 shows a state in which the finish forming of the work 1 has been completed by the finish forming apparatus (that is, the lower end of the punch 6 described later). As shown in FIG.
Has a first fixing portion 21, a second fixing portion 22, and an outer frame portion 23. The base 2 is provided with a die 3 which can accommodate the work 1 and defines a molding cavity 30 for finish-molding the work 1. The die 3 is provided with a molding cavity 3 having a central axis P and a workpiece 1 charged therein.
0 is defined.

The die 3 includes a fixed die 31 fixed on the second fixed portion 22 of the base 2, and a die 3 installed on the fixed die 31 and extending horizontally with respect to the fixed die 31 and the base 2. And a rotatable rotating die 33.
Between the rotating die 33 and the fixed die 31, a first bearing 34 and a second bearing 35 which can function as a smooth rotating means are interposed. Between the outer frame portion 23 and the rotating die 33,
A third bearing 36 that can function as a sliding means is interposed. With the first bearing 34, the second bearing 35, and the third bearing 36,
The rotating die 33 can smoothly rotate around the center axis P of the molding cavity 30 of the die 3 with respect to the fixed die 31 and the base 2.

A plurality of helical molding teeth 38 having a helical groove shape are formed on the inner peripheral portion of the rotating die 33 that defines the molding cavity 30. Helical molded teeth 38
Is for finish-forming the helical coarse teeth 1d of the work 1 and is formed at a pitch corresponding to the target pitch after the finish forming of the helical coarse teeth 1d of the work 1.

A plurality of straight molding teeth 39 substantially parallel to the center axis P (that is, extending in the vertical direction in the figure) are formed in the inner peripheral portion of the fixed die 31 constituting the molding cavity 30. ing. The straight formed teeth 39 are for finish forming the straight coarse teeth 1 e of the work 1, and are provided below the helical formed teeth 38 to finish form the straight coarse teeth 1 e of the work 1. It is formed at a pitch corresponding to a later target pitch.

As shown in FIG. 1, a column-shaped vertical mandrel 4 is provided in a center hole 3a penetrating the die 3 in the vertical direction.
0 is coaxially fitted and fixed. Mandrel 4
Numeral 0 is fixed to the mandrel table 41 of the base 2. The outer diameter of the mandrel 40 substantially corresponds to the inner diameter of the central hole 1c of the work 1. A vertical knockout sleeve 4 having a cylindrical shape is provided between the mandrel 40 and the fixed die 31.
2 are fitted coaxially so as to be able to move up and down. The knockout sleeve 42 is lifted by the knockout 43, and is used to take out the work 1 from the die 3 by lifting the work 1 which has been formed and finished with respect to the die 3 as it rises.

At the lower end of the knockout sleeve 42, a flange 42m is formed, and the flange 42m and the fixed die 3 are formed.
A coil-shaped sleeve spring 44 is interposed therebetween. The sleeve spring 44 is a knockout sleeve 4.
2 is urged downward to bring the flange 42m into contact with the knockout 43. When the flange 42m is in contact with the knockout 43, the knockout sleeve 42 is retracted downward.

At the upper end of the knockout sleeve 42,
A plurality of concave positioning portions 42c are formed. The positioning portion 42c is formed at a position corresponding to the protrusion 1f of the work 1. The work 1 is inserted into the concave positioning portion 42c.
When the projection 1f is fitted, the work 1 is positioned in the circumferential direction. In this state, the work 1 is the mandrel 4
It does not rotate in the circumferential direction with respect to 0.

When the work 1 is positioned as described above, the mandrel 40 enters and fits into the center hole 1c of the work 1 to regulate the deformation of the inner peripheral portion of the center hole 1c.
Therefore, at the time of finish forging, deformation of the inner peripheral portion of the central hole 1c of the work 1 is suppressed. The angular positional relationship between the positioning portion 42c of the knockout sleeve 42 and the straight forming teeth 39 of the fixed die 31 corresponds to the angular positional relationship between the projection 1f and the straight coarse tooth 1e on the workpiece 1.

In this embodiment, the lifting plate 5 is provided above the die 3. The elevating plate 5 can function as an elevating unit that moves up and down with respect to the die 3 in directions indicated by arrows Y1 and Y2. A punch holder 51 is held on the lower surface 5d of the lifting plate 5 via a cylindrical holder 50 so as to be rotatable in the circumferential direction. The punch holder 51 is provided to be rotatable in a horizontal direction around the central axis P along a circumferential direction by a fourth bearing 52 and a fifth bearing 53 that can function as a smooth rotating means. A main spring 54 is interposed between the punch holder 51 and the elevating plate 5, and the main holder 54 constantly urges the punch holder 51 downward. In a normal state, a gap L1 having a predetermined gap width is formed between the punch holder 51 urged by the main spring 54 and the lower surface of the lifting plate 5.

A punch 6 for finish forming is mounted below the punch holder 51 so as to be located directly above the mandrel 40. The center axis of the punch 6 and the center axis of the punch holder 51 are aligned with the center axis P of the molding cavity 30 of the die 3. The punch 6 has a cavity 6 opening downward.
0 and a pressure ring portion 62 projecting downward so as to define the cavity 60. The pressure ring portion 62 faces the ring groove 1h of the work 1 and presses it. The cavity 60 can accommodate the upper end of the mandrel 40.

A plurality of helical punch teeth 64 are formed on the outer periphery of the punch 6. Punch teeth 64
Have substantially the same shape as the helical coarse teeth 1d of the work 1 and are formed at substantially the same pitch as the helical coarse teeth 1d of the work 1. As shown in FIG.
Helical tooth grooves 65 are formed between two punch teeth 64 adjacent to each other in the punch 6.

A guide pin 7 functioning as a shaft-like guide operation member is fitted on the outer peripheral side of the punch 6. As a result, the guide pin 7 can be advanced and retracted along the tooth groove 65 of the punch 6, that is, in the directions of arrows C1 and C2 (see FIG. 12). Therefore, the guide pin 7 is used for the punch 6 and the die 3.
Are mounted at an angle with respect to the central axis P. As shown in FIG. 1, the guide pin 7 is held on the outer periphery of the punch 6 via a pin holder 70. The pin holder 70 is fixed to the punch 6 or the punch holder 51, has a cylindrical shape surrounding the outer periphery of the punch 6, and has a ring-shaped flange 70w protruding radially inward at the lower end.

The flange 70w prevents the guide pin 7 from coming off. A pin spring 72 (for example, a coil spring) functioning as an urging portion is interposed between the guide pin 7 and the punch 6, and the pin spring 72 urges the guide pin 7 downward.
As a result, the tip of the guide pin 7 projects by a predetermined amount from the lower surface of the punch 6, and the projection 7 c of the guide pin 7 comes into contact with and engages with the flange 70 w of the pin holder 70. ing. The guide pin 7 is provided with a punch 6
Are arranged at positions obtained by equally dividing the outer circumference of the three.

As shown in FIG. 1, on the lower surface 5d of the elevating plate 5, a long rod-shaped pressing body 80 is provided with a fixture 82.
Are attached along the vertical direction. Pressing body 8
A total of two 0s are provided at diagonal positions sandwiching the central axis P of the die 3. In FIG. 1, the distance between the center axis P of the molding cavity 30 of the die 3 and the center line of the pressing body 80 in the radial direction of the rotating die 33 is indicated by R.

Further, a total of two guide recesses 85 are formed in a diagonal position on the upper surface of the rotating die 33 at diagonal positions sandwiching the central axis P. The guide recess 85 extends in an arc along the circumferential direction around the central axis P of the molding cavity 30 of the die 3. As can be understood from FIG. 5, the guide recess 85 has an inclined surface 85a as a bottom surface, an upright surface 85c on the deepest side of the inclined surface 85a, and a side surface 85d along the circumferential direction. At the lower end of the pressing body 80, an engaging surface 81 that is inclined in the same direction as the inclined surface 85a of the rotating die 33 is formed.

The inclined surface 85a extends around the central axis P of the molding cavity 30 of the die 3 along the circumferential direction. The groove width D1 of the guide recess 85 is set so as to substantially correspond to the width D2 of the lower end portion of the pressing body 80.
It has a function of guiding the lower end of the camera. In the present embodiment, as shown in FIG. 6, an inward fixed stopper 23p is provided on the inner peripheral side of the outer frame portion 23, and an outward mating stopper 33p is formed on the outer peripheral portion of the rotating die 33. Have been.
As a result, excessive rotation of the rotating die 33 is prevented. As shown in FIG. 6, a return spring 89 is provided between the mating stopper 33p of the rotating die 33 and the fixed stopper 23p of the fixed die 31. The return spring 89 moves the partner stopper 33p of the rotating die 33 in the circumferential direction (arrow B1).
Direction). When the rotating die 33 is not loaded (for example, when the workpiece 1 is held on the knockout sleeve 42), the return spring 89 always moves the rotating die 3 so that the rotating die 33 is located at the home position thereof.
3 is returned to the origin.

When the rotary die 33 is returned to the home position by the return spring 89, as can be understood from FIG. 1, the engaging surface 81 at the tip of the pressing body 80 attached to the elevating plate 5 They are located above the inclined surface 85a and face each other. Therefore, when the elevating plate 5 moves down with the punch 6 in the direction of arrow Y2, the engaging surface 81 at the tip of the pressing body 80 just becomes the inclined surface 85a of the guide recess 85.
Is pressed into engagement with the ascending end side.

As shown in FIG. 5, when the pressing engagement by the pressing body 80 proceeds, the horizontal component force F is based on the principle of the inclined wedge caused by the abutting engagement between the inclined surface 85a and the engaging surface 81.
Is generated, and becomes a driving force for rotating the rotating die 33. This driving force causes the rotating die 33 to rotate around its central axis P. Therefore, the inclined surface 85a and the pressing body 80
It can function as a forced turning mechanism that can turn the turning die 33.

The horizontal component force based on the engagement surface 81 of the pressing body 80 pressing the inclined surface 85a is defined as F, and the distance connecting the center axis P of the molding cavity 30 of the die 3 and the pressing body 80 in the radial direction is defined as F. R, the driving force generated by the combination of the pressing body 80 and the inclined surface 85a is the product of F and R (F ×
R). Therefore, in the present embodiment, as can be understood from FIG.
Is provided at a considerable distance from the central axis P of the above, and a large distance R is secured, which is advantageous for securing the driving force described above.

Here, in the present embodiment, the pressing body 80
The rotation of the rotating die 33 due to the lowering of the work 1
To correspond to the rotation of the rotating die 33 due to the lowering of
The angle between the inclined surface 85a and the engagement surface 81 is set. (Finish Forming Method) The finish forming method according to the present embodiment will be described below. This embodiment is cold finish forging. First, FIG.
As shown in FIG.
And the protrusion 1f of the work 1 is fitted to the concave positioning portion 42c of the knockout sleeve 42, and the work 1 is held on the knockout sleeve 42. Thus, the work 1 is positioned in the circumferential direction. At this time, as shown in FIG. 1, the height position of the knockout sleeve 42 is set such that the height of the lower surface of the large-diameter portion 1a of the work 1 substantially corresponds to the height of the upper surface 33u of the rotating die 33. This is set by the knockout 43.

When the work 1 is held on the knockout sleeve 42 as described above, the phase of the helical rough teeth 1d of the work 1 and the phase of the punch teeth 64 of the punch 6 are
Often not matched. For this reason, a punch-work phase matching operation for matching the phase of the helical rough teeth 1d of the work 1 with the phase of the punch teeth 64 of the punch 6 is performed. This will be described with reference to FIGS.

(1) As shown in the initial state of FIG. 7 (A), the part of the upper surface 1u of the helical rough tooth 1d of the work 1 is defined as a virtual point Xk, and the punch 6 The virtual point of the lower surface 6a of the punch tooth 64 is defined as Yk. Before matching the phases, the virtual point Xk of the work 1 is on the virtual line X extending in the vertical direction and the punch 6
Is on a virtual line Y extending in the vertical direction. In the initial state shown in FIG. 7A, since the phase of the virtual point Xk of the work 1 and the phase of the virtual point Yk of the punch 6 do not match, the virtual line X and the virtual line Y are separated by a predetermined distance ΔK. I have. In the present embodiment, the work 1
Are positioned in the knockout sleeve 42 and do not rotate.

(2) As can be understood from FIG.
With the virtual line X and the virtual line Y kept separated by a predetermined distance ΔK, the punch 6 descends in the direction of arrow Y2, that is, toward the work 1. Then, as can be understood from FIG.
The tip of the guide pin 7 protruding from the lower surface 6 a of the punch 6 abuts on the upper surface 1 u of the work 1. Guide pin 7
A pin engaging surface 7f is formed at the tip of the.

At this time, as can be understood from the initial state of FIG. 7A, the point 7fo of the pin engaging surface 7f of the guide pin 7 when the guide pin 7 contacts the work 1 is
In contact with the upper end of the helical coarse tooth 1d of the helical coarse tooth 1d, the position is closer to the direction of arrow E1 than the virtual line X. (3) When the downward movement of the punch 6 in the direction of the arrow Y2 further proceeds,
As can be understood from FIG. 7B, since the punch teeth 64 of the workpiece 1 descending press the guide pin 7, the horizontal component G
Occurs, and the guide pin 7 is provided with the helical tooth groove 65 of the punch 6.
Relative to the depth of the tooth groove 65, that is, in the direction of the arrow C2 (obliquely upward), and the pin engaging surface 7f of the guide pin 7 moves the upper surface 1u of the work 1 along the circumferential direction of the punch 6. That is, relative displacement occurs in the direction of arrow E2. Therefore, as can be understood from FIG. 7B, the point 7fo of the pin engagement surface 7f of the guide pin 7 is exactly near the imaginary line X.

When the lowering of the punch 6 further proceeds, FIG.
As can be understood from FIG.
Is the two helical coarse teeth 1 adjacent to each other in the workpiece 1.
During the period d, it directly faces the tooth space 1k. In the face-to-face state, the tooth groove 65 of the punch 6 and the tooth groove 1k of the work 1 are located on a straight line, so that the tip of the guide pin 7 is directed toward the tooth groove 1k of the work 1. You can enter.

(4) As can be understood from FIG.
In a state where the tooth groove 65 of the punch 6 and the tooth groove 1k of the work 1 are located on a straight line, the tip of the guide pin 7 urged in the direction of arrow C1 by the pin spring 72 is positioned in the tooth groove 1k of the work 1. Start to enter. When the tip of the guide pin 7 enters the tooth groove 1k of the work 1 held in the non-rotation state, the guide pin 7 is restrained by the tooth groove 1k of the work 1 and moves in the directions of arrows E1 and E2. The displacement is suppressed.

(5) As described above, when the lowering of the punch 6 in the direction of the arrow Y2 proceeds with the guide pin 7 being restrained by the work 1, as shown in FIG. The punch teeth 64 are guided obliquely (in the direction of arrow K) by the guide pins 7. Therefore, the punch 6 descends while relatively rotating in the direction of the arrow E1. Therefore, when the lower surface 6a of the punch 6 contacts the upper surface 1u of the work 1, the phase of the virtual point Xk of the work 1 matches the phase of the virtual point Yk of the punch 6.

In this state, as can be understood from FIG. 7E, the tooth groove 65 of the punch 6 and the tooth groove 1k of the work 1 are continuous (phase matching state), and the punch 6
The punch teeth 64 and the helical coarse teeth 1d of the work 1 are in a continuous state (phase matching state). A part of this state is shown in FIG. The punch-work phase matching operation is performed as described above.

At the time when the punch / work phase matching operation is completed, as can be understood from FIG. 1, the upper surface 51u of the punch holder 51 has not yet contacted the lower surface 5d of the lifting plate 5, that is, The gap L1 has not yet disappeared, that is, the work 1 has not been pushed into the molding cavity 30 yet. Further, the pressing body 80 has an inclined surface 85.
I have not yet contacted a.

Subsequently, a lifting plate 5 in the direction of arrow Y2
When the punch 6 further descends, the engaging surface 81 at the tip of the pressing body 80 starts to contact the inclined surface 85 a of the guide recess 85 of the rotating die 33. Then, the driving force of the horizontal component force F generated based on the above-described wedge principle causes the turning die 33 to start turning in the circumferential direction around the central axis P. This is the work die phase matching operation.

Since the work-die phase matching operation is performed as described above, in this embodiment, when the work 1 is set on the knockout sleeve 42, the work 1
Even if the phase of the helical rough tooth 1d of the above and the phase of the helical molded tooth 38 of the rotating die 33 are inconsistent,
As described above, with the rotation of the rotary die 33, the phase of the groove-shaped helical molded teeth 38 of the rotary die 33 matches the phase of the helical rough teeth 1d of the work 1. When they match, they begin to fit.

8 and 9 show the phase of the helical rough teeth 1d of the work 1 and the helical molding teeth 3 of the rotating die 33.
8 shows an initial state in which the phases do not match. However, since the rotating die 33 is rotated in the direction of arrow SA by the horizontal component force F, as shown in FIGS. The phases of the helical molded teeth 38 match, and after the coincidence, the helical coarse teeth 1d of the workpiece 1 start to fit into the groove-shaped helical molded teeth 38. FIG. 12 shows an initial state in which the fitting is started. Thus, the work-die phase matching operation is performed.

After the work-die phase matching operation is performed as described above, the lowering of the elevating plate 5 in the direction of arrow Y2 further proceeds, so that the gap L1 disappears, and the upper surface 51u of the punch holder 5 is raised and lowered. Directly contact the lower surface 5d of the gate 5. Therefore, thereafter, the pressing force due to the lowering of the elevating plate 5 is directly transmitted to the punch holder 51, the punch 6, and eventually the work 1. Thereby, the work 1 is strongly pressed by the punch 6 and descends in the arrow Y2 direction.

Here, since the back pressure based on the knockout sleeve 42 is also applied to the lower surface of the work 1, the work 1 is straightened while being sandwiched between the knockout sleeve 42 and the punch 6 under high pressure. Then, it descends in the direction of arrow Y2. As a result, the helical rough teeth 1d of the work 1 are finish-formed by the helical forming teeth 38 of the rotating die 33.

At the time of finish molding, the work 1 is locked by the positioning portion 42c of the knockout sleeve 42 and its rotation is restrained. The rotating die 33 is rotated around its central axis P by abutting engagement with the helical molded teeth 38 of the spiral shape 33. Thus, the rotating die 3
When the rotary member 3 rotates, the engaging surface 81 of the pressing body 80 still presses and engages the inclined surface 85a of the rotary die 33, so that the driving force for rotating the rotary die 33 continues as described above. This driving force can assist the turning of the turning die 33. Therefore, the turning of the turning die 33 at the time of finish molding is further smoothed.

In the present embodiment, the work 1 is a rotating die 3
When the third helical molded tooth 38 is lowered, the straight coarse tooth 1e of the work 1 also descends straight in the direction of the arrow Y2. Finished molding is performed by the straight molding teeth 39 of the fixed die 31. In the present embodiment, the finish forming is an overhang forming in which the meat is stretched. Therefore, the helical rough teeth 1d of the work 1 and the straight coarse teeth 1e of the work 1 are both formed in the thickness forming during the finish forming. Helical coarse teeth 1d and straight coarse teeth 1e having desired thickness, shape and pitch are obtained.

When the finish forming of the work 1 is completed as described above, the lift plate 5 and the knockout sleeve 42 are moved at the same speed with the arrow Y1 while the work 1 is held between the punch 6 and the knockout sleeve 42. Raise in the direction. At this time, the rotating die 33 rotates. As a result, the work 1 after the finish molding is applied to the molding cavity 30 of the die 3.
Taken out of

As can be understood from the above description, according to the present embodiment, the following effects can be obtained. A punch / work phase matching operation for matching the phase of the punch teeth 64 of the punch 6 with the phase of the helical rough teeth 1d of the work 1 is performed by the guide pin 7 and the pin spring 72 which urges the guide pin 7 so as to project from the punch 6. And can be realized by a mechanical method using Therefore, it is possible to abolish or simplify the optical method and the electric method that easily cause a problem in reliability. A work / die phase matching operation for matching the phase of the helical rough teeth 1d of the work 1 with the phase of the groove-shaped helical molded teeth 38 of the die 3 is performed by the pressing body 80 and the inclined surface 85a.
This can be realized by a mechanical method utilizing contact engagement with the shaft.
Therefore, it is possible to abolish or simplify the optical method and the electric method that easily cause a problem in reliability. Since the work 1 is maintained in a non-rotating state, if the work 1 is pushed into the molding cavity 30 of the die 3, the work 1
Helical coarse teeth 1d and straight coarse teeth 1e can be simultaneously finish-formed. Therefore, it is possible to significantly streamline the process. The combination of the pressing body 80 and the inclined surface 85a can realize a forced rotation mechanism for rotating the rotation die 33.
Thus, when the helical coarse teeth 1d of the work 1 are finish-formed, the turning operation of the turning die 33 can be assisted, which is advantageous for suppressing the turning trouble.

(Other Embodiments) In the above-described embodiment, as described above, the tooth profile of the work 1 before finish forming is slightly smaller than the dimension after finish, and the work 1 is formed by overhang forming. In the form of finish molding. However, the present invention is not limited to this, and the method and the apparatus of the present invention may have a form in which the tooth profile of the work 1 before the finish forming is set to be slightly thicker than the size after the finish, and the finish forming is performed by ironing. It is. Alternatively, finish molding for other purposes such as sizing may be used.

In the above-described embodiment, the work 1 having both the helical coarse teeth 1d and the straight coarse teeth 1e is also subjected to finish forming. However, the method of the present invention and the apparatus of the present invention are not limited to this. The present invention is not limited to this, and can be applied to a form in which a workpiece having helical coarse teeth but not having straight coarse teeth is finish-formed. In the above-described embodiment, both the punch-work phase matching operation of the above-described method and the work-die phase matching operation of the above-described method are performed in combination. However, the present invention is not limited to this. In some cases, the punch-work phase matching operation of the above-described method is performed, but the work-die phase matching operation may be performed by another method.

Alternatively, depending on the finish forming method, the phase matching operation between the punch and the work may be performed by another method, but the phase matching operation of the work and the die of the above-described method may be performed. Further, in the above-described embodiment, as described above, the pressing body 80 is
Side, and the inclined surface 85a is installed on the rotating die 33. In some cases, on the contrary, the pressing body 80 is installed on the rotating die 33 side, and the inclined surface 85a is
It may be installed on the side.

Further, as shown in FIG. 5, an engaging surface 81 'formed of a semicircular convex surface having a circular cross section such as a hemisphere is pressed against the pressing body 80.
Can also be provided at the tip of the. Further, as shown in FIG. 7A, a pin engaging surface 7f 'formed of a semicircular convex surface having a circular cross section such as a hemisphere may be provided at the tip of the guide pin 7.
In addition, the present invention is not limited to the embodiment described above and shown in the drawings, but can be appropriately selected and implemented as needed.

[0063]

According to the method according to the first aspect of the present invention, the phase matching between the helical rough teeth of the work and the punch teeth of the punch is performed by using the guide operator and the urging portion for urging the guide operator. It can be realized by a mechanical method. Therefore, it is possible to abolish or simplify the optical method and the electric method that easily cause a problem in reliability. Therefore, it is suitable for finish forming (for example, forging finish forming) performed in a situation where use environment conditions are severe.

According to the method of the second aspect, the phase matching between the helical rough teeth of the workpiece and the groove-shaped teeth of the die is determined.
This can be realized by a mechanical method using a contact engagement between the pressing body and the inclined surface. Therefore, a gear mechanism such as a screw screw, which tends to hinder reliability, does not have to be the main mechanism. Further, an optical system or an electric system which easily causes a problem in reliability can be eliminated or simplified.

According to the device according to the third aspect of the present invention, the apparatus can be used to carry out the method of the first aspect of the invention, and the helical work of the work is performed by a mechanical method using a guide operator and an urging portion for urging the guide operator. The phase of the coarse teeth and the phase of the punch teeth of the punch can be matched, and the optical method and the electric method that easily cause a problem in reliability can be eliminated or simplified. Therefore, it is suitable for finish forming (for example, forging finish forming) performed in a situation where use environment conditions are severe.

The apparatus according to the fourth aspect of the present invention can be used to carry out the method of the second aspect of the present invention, and uses a mechanical method utilizing a pressing body and an inclined surface to form a helical rough tooth of a workpiece and a groove-like shape of a die. The phase with the molded teeth can be matched, and the optical system and the electric system can be eliminated or simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entire apparatus in a state where a work is set on a knockout sleeve and a tip end of a guide pin is in contact with an upper surface of the work.

FIG. 2 is an enlarged longitudinal sectional view of a main part of FIG. 1;

FIG. 3 is a cross-sectional view showing a state in which a guide pin is fitted in a tooth space between punch teeth of a punch.

FIG. 4 is a vertical cross-sectional view showing the entire forging apparatus in a state immediately after a punch is at a lower end and a work has been finished and formed;

FIG. 5 is a longitudinal sectional view showing a state in which an engaging surface of a pressing body is engaged with an inclined surface formed on a rotating die.

FIG. 6 is a configuration diagram showing a plane near a return spring for returning a rotating die to an origin position.

FIG. 7 is a configuration diagram schematically showing a procedure for matching the phase of the punch teeth of the punch with the phase of the helical coarse teeth of the work.

FIG. 8 is a configuration diagram schematically showing an initial state in which the phase of the helical rough tooth of the workpiece does not match the phase of the helical molded tooth of the die.

FIG. 9 is a plan view schematically showing an initial form in which the phase of the helical rough tooth of the workpiece does not match the phase of the helical molded tooth of the die.

FIG. 10 is a configuration diagram schematically showing a state in which the phase of the helical rough teeth of the workpiece matches the phase of the helical molded teeth of the die.

FIG. 11 is a plan view schematically showing a state in which the phase of the helical coarse teeth of the workpiece matches the phase of the helical molded teeth of the die.

FIG. 12 shows that the phase of the punch teeth of the punch coincides with the phase of the helical coarse teeth of the work, and the tip of the helical coarse teeth of the work matches the phase of the helical molded teeth of the die; It is a perspective view of the principal part which shows the form fitted in the molding cavity typically.

FIG. 13 is a longitudinal sectional view of a work.

FIG. 14 is a configuration diagram showing a side surface of a main part of an apparatus according to a conventional technique.

FIG. 15 is a configuration diagram showing a plane of a main part of an apparatus according to a conventional technique.

[Explanation of symbols]

In the figure, 1 is a workpiece, 1d is a helical coarse tooth, 1e is a straight coarse tooth, 2 is a base, 3 is a die, 30 is a molding cavity, 31 is a fixed die, 33 is a rotating die, and 38 is a helical. Molded tooth, 39 is a straight tooth, 40 is a mandrel, 4
2 is a knockout sleeve, 5 is an elevating plate (elevating part), 6 is a punch, 64 is a punch tooth, 65 is a tooth groove of the punch, 7 is a guide pin (guide operating element), 72 is a pin spring (biasing part), 80 Denotes a pressing body, 81 denotes an engagement surface, 85 denotes a guide recess, and 85a denotes an inclined surface.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Noguchi 2458 Irizen-cho, Shimoshinkawa-gun, Toyama Prefecture Aisin Shinwa Co., Ltd. Terms (reference) 4E087 AA06 AA10 BA02 CA21 CA22 CA23 CA33 CB01 CB02 DA04 EC17 EC18 EC22 EC37 EC46 EC51 ED28 ED31 HA04 HA82

Claims (5)

[Claims] 1. A die having a molding cavity having a plurality of helical groove-shaped forming teeth formed at a predetermined pitch, and a helical shape formed at a pitch corresponding to the forming teeth of the die. A work having a plurality of helical coarse teeth formed thereon, and a plurality of helical punch teeth formed at a pitch corresponding to the pitch of the helical coarse teeth of the work, and having a plurality of helical punch teeth circumferentially relative to the work. Using a punch that is rotatable and capable of pressing the work, and an elevating unit that moves the punch up and down with respect to the die, the circumferential phase of the punch teeth of the punch and the helical coarse teeth of the work is adjusted. A punch / work phase matching operation is performed, and thereafter, the work is pushed into the molding cavity of the die as the punch is lowered by the elevating unit, and the work is inserted into the die cavity. In the method of finish-forming a helical coarse tooth, which performs a finish-forming operation of finish-forming a kar coarse tooth with the molding tooth of the die, the punch has a helical tooth groove between two adjacent punch teeth. A shaft-like guide operation member provided so as to be able to advance and retreat along the tooth space and inclined with respect to the center axis of the punch, and a tip end of the guide operation member with respect to the center axis of the punch. A biasing portion for biasing the guide operating member so as to protrude from the lower surface of the punch while being inclined, and for allowing the guide operating member to retreat to the back of the tooth space. The operation is performed by lowering the punch toward the work in a state where the distal end of the guide operator protrudes from the lower surface of the punch, thereby causing the distal end of the guide operator to abut the work. Along with,
The guide operator is retracted into the tooth groove of the punch and is relatively displaced in the circumferential direction of the work, and the guide operator urged by the urging unit is moved to the tooth groove of the work with the relative displacement. Fitting, and thereafter, the punch is relatively rotated with respect to the workpiece by the guiding action of the guiding operator,
A finish forming method for a helical coarse tooth, comprising: performing circumferential phase matching between a punch tooth of the punch and a helical coarse tooth of the work. 2. A die having a molding cavity having a plurality of groove-shaped teeth formed in a helical shape formed at a predetermined pitch, and a helical shape formed at a pitch corresponding to the molding teeth of the die. A work having a plurality of helical coarse teeth formed thereon, a punch capable of pressing the work, and an elevating unit for raising and lowering the punch with respect to a die, and forming helical coarse teeth of the work and forming teeth of the die. After that, the work is pushed into the molding cavity of the die with the lowering of the punch by the elevating unit, and the helical coarse teeth of the work are aligned. In the method of finish-forming a helical coarse tooth, which performs a finish-forming operation of finish-forming with the molding teeth of the die, one of the die and the elevating unit includes the die A sloping surface extending along a circumferential direction around the central axis of the die and having an inclined surface inclined along a circumferential direction around the central axis of the die; the other of the die and the elevating unit is the elevating unit The work die has a pressing body that moves relative to the inclined surface along the inclined surface while pressing the inclined surface with the downward movement, and that can rotate the die in the circumferential direction with the relative movement. The phase matching operation is to lower the punch by the elevating unit, thereby pressing the pressing body provided on the one side against the inclined surface provided on the other side,
A method for finish-forming a helical coarse tooth, which is performed by rotating the die in a circumferential direction in response to pressing. 3. The work according to claim 1, wherein the work includes a plurality of the helical coarse teeth, and a plurality of the work extending below the helical coarse teeth substantially parallel to a center axis of the work. The die has straight coarse teeth, and the die is a rotatable rotary die having a plurality of helical groove-shaped forming teeth, and a center of the forming cavity disposed below the rotary die. A fixed die having a plurality of groove-shaped straight forming teeth extending substantially in parallel along an axis, wherein the finish forming operation forms the work with the die as the punch descends. The helical coarse teeth of the work are rotated by pushing the work into the cavity without substantially rotating the work with respect to the fixed die, and while rotating the rotating die with respect to the work. Die molding teeth As well as finish forming, finish forming method of the helical crude form teeth, which comprises forming finishing the straight crude form teeth of the workpiece in straight splines of the fixed die. 4. A punch having a plurality of helical punch teeth formed at a predetermined pitch and capable of rotating relative to the work in the circumferential direction to press the work, and a plurality of helical punches. A finish forming apparatus for helical coarse teeth, comprising: a die having a molding cavity having a groove-shaped molding tooth; and an elevating unit for elevating and lowering the punch with respect to the die. An axial guide manipulator mounted in the helical tooth space between the two punch teeth so as to be able to advance and retract along the tooth space and to be inclined with respect to the center axis of the punch; The guide operator is urged so as to protrude from the lower surface of the punch while the tip of the guide operator is inclined with respect to the center axis of the punch, and the guide operator is allowed to retreat to the back of the tooth space. Energizing part And a finish forming apparatus for helical coarse teeth. 5. A punch which can press a workpiece, a die having a molding cavity having a plurality of helical groove-shaped molding teeth, and a lifting unit which raises and lowers the punch with respect to the die. In the finish forming device for helical coarse teeth, one of the die and the elevating portion extends along a circumferential direction around a central axis of a molding cavity of the die and is inclined along the circumferential direction. The other of the die and the elevating unit moves relative to the inclined surface along the inclined surface while pressing the inclined surface with the descending of the elevating unit. A finish forming device for helical coarse teeth, further comprising a pressing body for generating a driving force for rotating the die in a circumferential direction.