WO2018008967A1

WO2018008967A1 - Powder metallurgy press mold for manufacturing helical gear

Info

Publication number: WO2018008967A1
Application number: PCT/KR2017/007160
Authority: WO
Inventors: 정삼균
Original assignee: 정삼균
Priority date: 2016-07-06
Filing date: 2017-07-05
Publication date: 2018-01-11
Also published as: KR101692984B1

Abstract

The present invention relates to a powder metallurgy press mold and, more specifically, to a powder metallurgy press mold for manufacturing a helical gear, wherein a guide punch is rotated in a guide die, the guide punch having a male spiral gear tooth formed in a lengthwise direction on an outside surface thereof, an upper punch attached to a lower surface thereof, and a bearing assembly attached to an upper surface thereof, the guide die having a female spiral gear tooth formed on an inside surface thereof. Therefore, the powder metallurgy press mold has a simple structure; the guide punch has a relatively large diameter and is thus stably rotated; and the upper punch is attached to the lower surface of the guide punch, but not to the guide die, so as to secure a space for facilitating the motion of a hopper during a molding process.

Description

Powder metallurgy press mold for helical gear manufacturing

The present invention relates to a powder metallurgy press die, and in particular, a male spiral gear tooth is formed in a longitudinal direction on an outer surface, an upper punch is attached to a bottom surface, and a guide punch on which an bearing assembly is attached to an upper surface is formed on a female spiral. It is structurally simple by rotating in the guide die formed with gear teeth, and because the diameter of the guide punch is relatively large, the rotation is stable, and the upper punch is not attached to the guide die, but is formed by attaching to the bottom of the guide punch to secure space. The present invention relates to a powder metallurgical press mold for manufacturing a helical gear to facilitate movement of a hopper during operation.

In general, a variety of gears are installed in the power transmission unit for transmitting power or decelerating acceleration and deceleration applied to machinery or automobiles. Gears are mechanical parts consisting of gears connected to a rotating shaft, which work in pairs and the teeth of one gear mesh with the teeth of the other gear to transmit or decelerate rotational motion and torque without slipping.

Most gears are circular, so that the contact surface of the gear teeth must be precisely shaped to achieve a smooth transfer of motion at a constant speed ratio. The axes connecting these gears should be relatively close, but in reality there is some spatial relationship with each other. That is, things that are parallel and not parallel, things that intersect and things that do not intersect.

Cylindrical gears and helical gears are cylindrical gears that transmit rotational motion between the two parallel axes. Among them, the helical gear is inclined to one side of the gear, smooth transmission, low vibration and noise, and is mainly used for large power transmission.

Conventional gear manufacturing methods including helical gears can be divided into cutting and non-cutting methods, and cutting methods include various methods such as hobbing and gear shaving, but usually after hobbing processing and burnishing It is processed through a process such as polishing or lapping. Non-cutting methods include gear forming by plastic processing using metal forming processes such as casting, forging, rolling, extrusion and powder metallurgy. Among them, the casting method is disadvantageous in terms of quality and productivity, and is not widely used, and research on the gear cooperative system by plastic processing suitable for mass production has been actively conducted.

Examples of the gear forming method by plastic processing include cold extrusion, precision forging, warm forging, and powder metallurgy. Double powder metallurgy is hardened by press molding metal powder, and then sintered by heating to a high temperature. As a method of making, there is a feature that secondary processing is not required as compared to other processing, and uniform and dense structure can be obtained.

Chinese Utility Model Registration No. 201208648 has been disclosed as an apparatus for manufacturing a helical gear by the powder metallurgy method.

However, this type of structure is structurally unstable because the guiding die is attached directly to the forming punch to obtain a rotational force, thereby rotating a large diameter bearing assembly with a small diameter. Due to the extreme bias, it has an unstable structure due to its structural dynamics, and the upper punch is very long, so that the exact right angle setting is difficult, and mold accidents frequently occur in the field. This is very short, there is a problem that the mold setting is difficult due to lack of space between the hopper and the guide die, which is a raw material input device in the product forming die.

In order to solve this problem, US Patent No. 5366363 is disclosed.

However, the US Patent No. 5366363 is a structure that is provided with two guide punches to give both sides rotational force, it is difficult to precisely produce a symmetrical mutual symmetry, each guide die is rotated as each guide punch is raised and lowered, respectively Since the side spur gear of the structure is rotated to rotate the center spur gear has a complicated structure.

(Priority Technology 1) Utility Model Registration of China 201208648

(Advanced technology 2) US patent registration 5366363

The present invention is to solve the above problems, a male spiral gear tooth is formed on the outer surface in the longitudinal direction, the upper punch is attached to the bottom surface, the upper side of the guide punch that the bearing assembly is attached to the female spiral gear on the inner surface It is structurally simple by rotating in the guide die formed, and the diameter of the guide punch is relatively large, so that the rotation is stable, and the upper punch is not attached to the guide die, but is attached to the bottom of the guide punch to secure space. It is an object of the present invention to provide a powder metallurgy press mold for manufacturing a helical gear to facilitate the movement of a hopper.

In addition, the present invention is easy to assemble the forming die and the upper punch, no trouble occurs after the setting, the length of the upper punch can be formed short, the right angle setting is easy, and each setting is difficult, the mold accident frequently occurs in the field, Another object is to provide a powder metallurgical press mold for the manufacture of helical gears which minimizes the torsional rotational force applied to the upper punch tooth and thus prevents the upper punch tooth from being broken.

Another object of the present invention is to provide a powder metallurgical press mold for helical gear manufacturing, which has a structurally stable structure such that the place where the rotational force is generated is structurally located at the center.

Features of the present invention for achieving the above object,

An upper mold coupled to the press machine by a holder to move up and down, and to form a helical gear having a shaft hole formed in a center of the metal powder; A molding die having the same inner diameter as the helical gear and having a female helical gear tooth formed therein and having a filling hole in which metal powder is seated, and having a fixed stopper at one side thereof; And a lower male helical gear tooth which is installed to be rotatable at the center of the upper surface of the lower bearing assembly provided in the lower plate and is inserted below the filling hole of the forming die, and which is coupled to the female helical gear tooth of the forming die on the outside thereof. A lower mold having a lower punch having a lower guide hole formed at a center thereof in a longitudinal direction, and a core fixed to the clamp to form an axial hole of the helical gear and drawn into the upper mold as the clamp moves up and down;

The upper mold,

An upper bearing assembly formed in a cylindrical shape and coupled to the bottom surface of the holder to rotate; An upper plate which is bolted to the bottom of the upper bearing assembly and has a through hole formed therein; A guide punch formed in a cylindrical shape and bolted to a center of a bottom surface of the upper bearing assembly to penetrate a through hole of the upper plate, and a male gear tooth formed in a longitudinal direction on an outer surface thereof; It is installed at the lower end of the upper plate, coupled by the upper plate and the plurality of upper guide posts, and provided with a movement stopper on the bottom side in contact with the fixed stopper of the forming die, the movement when the upper mold descends A guide plate on which the stopper comes in contact with the fixed stopper; A coupling hole is formed so that the guide punch penetrates through, and a female spiral gear tooth engaged with the male spiral gear tooth of the guide punch is formed on the inner side of the coupling hole so as to be raised together when the guide plate is raised. A rotating guide die; And an upper guide hole coupled to a center of a bottom surface of the guide punch and having an upper guide hole inserted into the core of the lower mold, and having an upper male helical gear tooth engaged with the female helical gear tooth of the filling hole of the forming die on the outside thereof. It characterized in that it comprises an upper punch.

Here, the forming die is provided with a die plate on the outside, a plurality of guide posts are installed perpendicular to the die plate to penetrate the guide plate and the upper plate to guide the lifting and lowering of the guide plate and the upper plate, The fixed stopper is installed at the lower end of the guide post.

Here, each of the upper guide posts is provided between the upper plate and the guide plate, respectively, is provided with a coil spring for returning the guide plate to its original position when the upper mold is raised.

Here, the forming die and the guide punch are each formed with a plurality of pinholes which are symmetrical to each other in the longitudinal direction to match the concentricity, and the concentricity after inserting the pins while the pinholes are placed in the same line during assembly. After matching, assemble.

Here, when the guide punch is lowered, when the moving stopper comes into contact with the fixed stopper and the guide plate is raised, the guide punch is rotated in one direction by the guide die and rotates the upper mold in one direction, thereby introducing the filling hole into the filling hole. Pressing the metal powder filled in the filling hole, and when the guide plate is lowered by the restoring force of the coil spring when the moving stopper is spaced apart from the fixed stopper when the upper mold is raised, the upper part is rotated in the other direction by the guide die The mold is rotated in the other direction and discharged from the filling hole.

Here, the forming die is lowered by itself when the pressurization of the helicom gear is completed, and the lower punch of the lower mold is rotated in one direction to the filling hole to rotate and discharge the helicom gear of the filling hole to discharge. Upon completion, the lower punch of the lower mold is rotated and discharged in the other direction from the filling hole to return to its original position.

Here, the male spiral gear teeth of the guide punch, the female spiral gear teeth of the guide die, the female helical gear teeth of the forming die, the lower male helical gear teeth of the lower punch and the upper male helical gear teeth of the upper punch are the same in one direction. Has a twist angle.

According to the powder metallurgical press mold for manufacturing the helical gear of the present invention configured as described above, a male spiral gear tooth is formed in the longitudinal direction on the outer side, an upper punch is attached to the bottom, and a guide punch on which the bearing assembly is attached to the inner side. It is structurally simple by rotating in the guide die formed with female spiral gear teeth, and the manufacturing cost is relatively small.The diameter of the guide punch is relatively large, so that the rotation is stable, and the upper punch is not attached to the guide die. By attaching to the bottom to secure space, the hopper can be easily moved during the molding operation.

In addition, according to the present invention, the molding die and the upper punch assembly is easy, so no trouble occurs after setting, and the length of the upper punch can be shortened, so that the right angle setting is easy, and each setting is difficult, and mold accidents frequently occur in the field. By minimizing the torsional rotational force applied to the upper punch teeth, the upper punch teeth can be prevented from being damaged in advance, thereby minimizing maintenance costs.

In addition, according to the present invention has a structurally stable structure to the place where the rotational force is generated in the structural center to reduce the occurrence of vibration or torsional moment, maximize the transmission of force to produce a helical gear stably have.

1 is a cross-sectional view showing the configuration of a powder metallurgy press mold for manufacturing a helical gear according to the present invention.

Figure 2 is a cross-sectional view for explaining the assembly process of the powder metallurgy press mold for manufacturing helical gears according to the present invention.

Figure 3 is a partially exploded perspective view showing a part of the powder metallurgy press mold for manufacturing helical gears according to the present invention.

Figure 4 is a perspective view showing a helical gear produced by the powder metallurgy press mold for manufacturing a helical gear according to the present invention.

5 is an operation explanatory diagram for explaining the operation of the powder metallurgy press mold for helical gear production according to the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration of the powder metallurgy press mold for manufacturing helical gears according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

1 is a cross-sectional view showing the configuration of the powder metallurgy press mold for manufacturing helical gear according to the present invention, Figure 2 is a cross-sectional view for explaining the assembly process of the powder metallurgy press mold for manufacturing helical gear according to the present invention, Figure 3 is a present invention Partial exploded perspective view showing a partial configuration of the powder metallurgy press mold for manufacturing helical gear according to Figure 4 is a perspective view showing a helical gear produced by the powder metallurgy press mold for manufacturing helical gear according to the present invention.

The powder metallurgical press mold 1 for helical gear manufacturing which concerns on FIG. 1 thru | or 4 is comprised from the upper metal mold | die 100, the molding die 200, and the lower metal mold | die 300. As shown in FIG.

First, the upper mold 100 includes an upper bearing assembly 110, an upper plate 120, a guide punch 130, a guide plate 140, a guide die 150, and an upper punch 160. do.

The upper bearing assembly 110 is formed in a cylindrical shape, the upper end is coupled to the press machine (not shown) by the holder 10, and the lower end is rotated by the thrust bearing TB.

The upper plate 120 is formed in the shape of a rectangular plate and bolted to the bottom of the upper bearing assembly 110, and a through hole 121 is formed so that the guide punch 130 penetrates and is coupled to the upper bearing assembly 110. do.

The guide punch 130 is formed in a cylindrical shape and is bolted to the center of the bottom surface of the upper bearing assembly 110 to penetrate the through hole 121 of the upper plate 120, and a male gear tooth in the longitudinal direction on the outer surface thereof ( 131 is formed. At this time, the diameter of the guide punch 130 is preferably the same or smaller than the upper bearing assembly 110, it is preferably formed larger than the upper punch (160).

The guide plate 140 is formed in a rectangular plate shape and is spaced apart from the lower end of the upper plate 120, and bolted by the upper plate 120 and the plurality of upper guide posts 141. The movable stopper 143 is in contact with the fixed stopper 240 of the 200, and when the upper mold 100 is lowered, the movable stopper 143 is brought into contact with the fixed stopper 240 and raised. Here, each upper guide post 141 is installed between the upper plate 120 and the guide plate 140, the coil spring 145 to return the guide plate 140 to its original position when the upper mold 100 is raised. These are each installed. In addition, the upper guide post 141 and the coil spring 145 are installed diagonally on the guide plate 140, and an air cylinder (not shown) is installed at the remaining diagonal to the air cylinder when the coil spring 145 is not operated. It may be operated by, or in place of the upper guide post 141 and the coil spring 145 may be installed by operating all the air cylinder.

The guide die 150 has a coupling hole 151 formed at the center thereof so that the guide punch 130 is penetrated in the form of a disc or a square plate, and a male gear of the guide punch 130 is formed at an inner side of the coupling hole 151. A female spiral gear tooth 153 engaged with the tooth 131 is formed and bolted to the guide plate 140 to be raised together when the guide plate 140 is raised to rotate the guide punch 130.

The upper punch 160 is formed in a cylindrical shape that is reduced in multiple stages from the top to the bottom, and is coupled to the center of the bottom surface of the guide punch 130, and the core 350 of the lower mold 300 is located at the center in the longitudinal direction. An upper guide hole 161 is provided to be inserted, and an upper male helical gear tooth 163 engaged with the female helical gear tooth 211 of the filling hole 210 of the forming die 200 is formed at an outer side of the lower end.

In addition, the forming die 200 has the same inner diameter as the helical gear 10 and a filling hole 210 in which metal powder is seated is formed, and a female helical gear tooth 211 is formed inside the filling hole 210. . Here, the forming die 200 is provided with a die plate 220 on the outside, a plurality of guide posts 230 perpendicular to the die plate 220 to penetrate the guide plate 140 and the top plate 120 It is installed to guide the lifting and lowering of the upper plate 120 and the guide plate 140, the fixed stopper 240 is installed at the lower end of the guide post 230.

In addition, the lower mold 300 includes a lower plate 310, a lower bearing assembly 320, a lower punch 330, a clamp 340, and a core 350.

The lower plate 310 fixes the lower punch 330.

Lower bearing assembly 320 is formed in a cylindrical shape, the lower end is fixedly coupled to the lower plate 310, the upper end is rotated by the thrust bearing (TB).

The lower punch 330 is formed in a cylindrical shape that is reduced in multiple stages from the bottom to the top thereof and is installed to be rotatable at the center of the upper surface of the lower bearing assembly 320 to be inserted below the filling hole 210 of the forming die 200. The lower male helical gear tooth 331 coupled to the female helical gear tooth 211 of the forming die 200 is formed at an outer side thereof, and the lower guide hole 333 is formed at the center in the longitudinal direction.

The clamp 340 raises and lowers the core 350.

As shown in FIG. 4, the core 350 is fixed to the clamp 340 to form the shaft hole 21 of the helical gear 20, and the core 350 is led into the upper mold 100 as the clamp 340 moves up and down.

Meanwhile, as illustrated in FIG. 2, the powder metallurgical press mold 1 for manufacturing a helical gear according to the present invention includes a plurality of molding dies 200 and a guide punch 130 which are symmetrical to each other in the longitudinal direction to match concentricity. Pinholes PH are formed, and when assembling each pinhole PH is placed in the same line, the pins P are inserted, and then concentricity is matched and assembled. Remove P).

In addition, the powder metallurgy press die 1 for manufacturing a helical gear according to the present invention includes a male spiral gear tooth 131 of a guide punch 130, a female spiral gear tooth 153 of a guide die 150, and a molding die 200. The female helical gear teeth 211, the lower male helical gear teeth 331 of the lower punch 330 and the upper male helical gear teeth 163 of the upper punch 160 are the same in one direction as the helical gear 20. It is desirable to have the same twist angle (eg right 20 °).

Hereinafter, with reference to the accompanying drawings, the operation of the powder metallurgy press mold for manufacturing helical gears according to the present invention will be described in detail.

As shown in FIG. 5A, a hopper (not shown) is drawn in a state in which the upper mold 100 is raised to fill metal powder in the filling hole 210 of the molding die 200. In this case, the lower punch 330 and the core 350 are inserted into the filling hole 210.

When the hopper is discharged, the upper mold 100 is lowered as shown in FIG. 5B, and the upper bearing assembly 110, the upper plate 120, and the guide punch (according to the lowering of the upper mold 100) are lowered. 130, the guide plate 140, the guide die 150, and the upper punch 160 are all lowered along the upper plate 120 and the guide plate along the guide post 230 of the forming die 200. 140 is lowered in a straight line.

Subsequently, when the upper mold 100 is lowered, the moving stopper 143 of the guide plate 140 comes into contact with the fixed stopper 240 of the forming die 200, thereby causing the guide plate 140 to move to the upper guide post ( The coil spring 145 installed in 141 is raised while winning tension.

Thus, when the guide plate 140 is raised, the guide punch 130 is rotated by the guide die 150 installed in the guide plate 140, and the upper bearing assembly 110 and the upper punch coupled to the guide punch 130 are rotated. 160 is rotated in one direction.

As a result, the upper male helical gear tooth 163 of the upper punch 160 is rotated while being engaged with the female helical gear tooth 211 of the filling hole 210 of the forming die 200, and then descends to form the inside of the filling hole 210. Pressurize the metal powder to produce a helical gear 20.

When the pressurization is completed, the upper mold 100 is raised as shown in FIG. 5C, and the core 350 of the molding die 200 and the lower mold 300 is lowered.

As a result, the movable stopper 143 of the guide plate 140 is released from the contact with the fixed stopper 240 of the forming die 200, so that the guide plate 140 of the coil spring 145 installed in the upper guide post 141 is removed. The guide punch 130, the upper bearing assembly 110, and the upper punch 160 are rotated in other directions and returned to their original positions while being returned to their original positions by the tension.

At the same time, the lower punch 330 is rotated in one direction in the filling hole 210 by the lower bearing assembly 320 due to the lowering of the forming die 200, and is raised to raise the helical gear 20 inside the filling hole 210. Will be discharged).

When the forming die 200 is raised as shown in FIG. 5A, the lower punch 330 is rotated in the other direction in the filling hole 210 by the lower bearing assembly 320 and lowered to return to its original position. After the core 350 is lifted to the original position by the clamp 340, the helical gear 20 is discharged to the outside while the hopper is put into the outside, and the metal powder is filled in the filling hole 210, and then the above operation. Repeat this.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

10 holder 20: helical gear

100: upper mold 110: upper bearing assembly

120: upper plate 130: guide punch

140: guide plate 150: guide die

160: upper punch 200: forming die

210: filling hole 220: die plate

230: guide post 240: fixed stopper

300: lower mold 310: lower plate

320: lower bearing assembly 330: lower punch

340: clamp 350: core

TB: Thrust Bearing PH: Pin Hole

Claims

An upper mold coupled to the press machine by a holder to move up and down, and to form a helical gear having a shaft hole formed in a center of the metal powder;

A molding die having the same inner diameter as the helical gear and having a female helical gear tooth formed therein and having a filling hole in which metal powder is seated, and having a fixed stopper at one side thereof; And

It is installed so as to be rotatable in the center of the upper surface of the lower bearing assembly provided in the lower plate is inserted into the bottom of the filling hole of the forming die, the lower male helical gear teeth to be coupled to the female helical gear teeth of the forming die on the outside, the length A lower mold having a lower punch having a lower guide hole formed in the center of the direction, and a core fixed to the clamp to form an axial hole of the helical gear and drawn into the upper mold as the clamp moves up and down;

The upper mold,

An upper bearing assembly formed in a cylindrical shape and coupled to the bottom surface of the holder to rotate;

An upper plate which is bolted to the bottom of the upper bearing assembly and has a through hole formed therein;

A guide punch formed in a cylindrical shape and bolted to a center of a bottom surface of the upper bearing assembly to penetrate a through hole of the upper plate, and a male gear tooth formed in a longitudinal direction on an outer surface thereof;

It is installed at the lower end of the upper plate, coupled by the upper plate and the plurality of upper guide posts, and provided with a movement stopper on the bottom side in contact with the fixed stopper of the forming die, the movement when the upper mold descends A guide plate on which the stopper comes in contact with the fixed stopper;

A coupling hole is formed so that the guide punch penetrates through, and a female spiral gear tooth engaged with the male spiral gear tooth of the guide punch is formed on the inner side of the coupling hole so as to be raised together when the guide plate is raised. A rotating guide die; And

The upper guide hole is coupled to the center of the bottom surface of the guide punch, the upper guide hole is provided so that the core of the lower mold is inserted therein, and the upper male helical gear tooth formed at the outer side is engaged with the female helical gear tooth of the filling hole of the forming die. Powder metallurgy press mold for helical gear manufacturing, characterized in that it comprises a punch.
The method of claim 1,

The molding die,

The die plate is provided on the outside, a plurality of guide posts are installed perpendicular to the die plate to penetrate the guide plate and the upper plate to guide the lifting and lowering of the guide plate and the upper plate, the lower end of the guide post Powder metallurgy press mold for helical gear manufacturing, characterized in that a fixed stopper is installed.
The method of claim 1,

Each of the upper guide posts,

Powder metallurgy press mold for manufacturing a helical gear, characterized in that the coil spring is installed between the upper plate and the guide plate to restore the guide plate to its original position when the upper mold is raised.
The method of claim 1,

In the forming die and the guide punch,

A plurality of pinholes are formed to be symmetrical to each other in the longitudinal direction so as to match the concentricity, helical, characterized in that the assembly after matching the concentricity after inserting the pins in the state in which each pinhole is located in the same line during assembly Powder metallurgy press mold for gear manufacturing.
The method of claim 3, wherein

The guide punch,

When the moving stopper is brought into contact with the fixed stopper when the upper mold is lowered, the guide plate is raised, and the metal plate is filled in the filling hole while being rotated in one direction by the guide die to rotate the upper mold in one direction to enter the filling hole. Pressurizing, when the guide plate is lowered by the restoring force of the coil spring while the moving stopper is spaced apart from the fixed stopper when the upper mold is raised, the other side is rotated in the other direction by the guide die and the filling is performed by rotating the upper mold in the other direction. Powder metallurgy press mold for helical gear manufacturing, characterized in that the discharge from the hole.
The method of claim 1,

The molding die,

When the pressurization of the helicom gear is completed, while lowering itself, the lower punch of the lower mold is rotated in one direction to the filling hole to rotate and discharge the helicom gear of the filling hole. A powder metallurgical press mold for manufacturing a helical gear, wherein the lower punch of the mold is rotated and discharged in the other direction from the filling hole.
The method of claim 1,

The male spiral gear teeth of the guide punch, the female spiral gear teeth of the guide die, the female helical gear teeth of the forming die, the lower male helical gear teeth of the lower punch and the upper male helical gear teeth of the upper punch,

Powder metallurgy press die for helical gear manufacturing, characterized in that it has the same twist angle in one direction.