KR100841413B1 - Two-stage ball stud cold forging parting mold and processing method using the same - Google Patents

Abstract

The present invention relates to a mold used for cold forging and lower fixed mold; A punch corresponding to the lower fixed mold, wherein a tapered surface of a lower light upper side is formed at a lower inner diameter and a stepped portion is formed at an outer side thereof; A special shape such as a two-stage ball stud used in the joint of a steering system or suspension system of a vehicle by an inside taper punch in which a plurality of divided pieces are combined to move up and down along the tapered surface of the punch and at the same time to contract and relax in the center direction. The present invention relates to a split mold for cold forging for two-stage ball studs that increases productivity by cold forging and improves product quality and provides excellent mechanical properties.

Double ball, punch, tapered surface, inside taper punch, split piece,

Description

Divided mold for cold forging process of duplicated ball stud and processing method

1 is a perspective view showing the shape of a two-stage ball stud processed by the present invention.

Figure 2 is a cross-sectional perspective view showing the internal configuration of an embodiment of the present invention mold.

Figure 3 is a cross-sectional view showing the internal configuration of an embodiment of the present invention mold.

Figure 4 is a cross-sectional view showing a forging process for producing a primary processed product by the primary mold for carrying out the present invention,

a) is a state diagram where a material rod is mounted in the primary lower mold,

b) is a state diagram in which the first upper mold is lowered to form a first processed product having a ball formed thereon.

 Figure 5 is a cross-sectional view of the operating state showing the forging process according to an embodiment of the secondary mold according to the present invention,

a) shows the state where the primary processing product is mounted on the lower fixed mold,

b) shows a state in which the upper movable mold descends and contacts the inner die of the lower fixed mold,

c) shows the state in which the inside taper punch wraps up the primary processed product as it rises along the tapered surface,

d) shows a state in which the inner punch is lowered to form a double ball and at the same time a recess is formed by a punch pin.

e) shows the state that the inside taper punch is radially opened and the finished product can be removed from the mold as the upper moving mold is raised.

* Explanation of symbols for main parts of the drawings

100: upper moving mold 110: punch

111: tapered surface 112: stepped portion

120: inside taper punch 121: divided piece

122: protrusion 123: opening spring

130: inside punch 131: central hole

132: two-stage ball forming unit 140: spacer

150: separation prevention cover 151: hole

160: punch pin 170: compression spring

200: lower fixed mold 210: inner die

215: through hole 220: carbide die

221: one end storage 230: milpin

300: material rod 310: primary processed product

311: Once ball 320: Finished product

321: heresy ball 322: waist

323: groove 324: fitting government

400: 1st lower mold 410: 1st upper mold

The present invention relates to a mold used for cold forging, more specifically, to increase the productivity in the production of workpieces, such as ball studs used in the joints of the steering system or suspension system of the automobile, the product quality is uniform and mechanical properties This invention relates to a two-stage ball stud forging cold die forging and a processing method using the same.

The two-stage ball stud for the car wiper linkage is a key function of the car wiper system. It is a function that connects the wiper motor and the arm to transmit power and is an important part that greatly simplifies the power transmission device of the wiper system.

Finished product 320 of the two-stage ball stud is configured as a two-stage vial, as shown in Figure 1 attached to one side is fitted with a fixing portion 324 to be fixed to the arm is formed, the middle portion One end ball 311 and two-stage ball 321 are formed on the other side, respectively, and a narrow waist 322 is formed between the one end ball 311 and the two-stage ball 321.

Therefore, in order to process the two-stage ball studs, due to the peculiarity of the shape having the lower waist 322 in the middle, it is difficult to work by general forging or press working. .

By the way, the processing method by the cutting process has a very high proportion of the material cost, the loss rate of the material is very large, especially the productivity per unit time is very low, which caused a price increase.

In addition, due to the processing characteristics, the distribution of quality is very high to meet the characteristics of the product requiring a uniform quality, there is a problem that causes the failure of the wiper system due to mechanical damage is relatively degraded.

On the other hand, the processing method by cold forging has many advantages to solve the above problems, but as described above, cold forging was not easy due to the shape characteristics of the two-stage ball stud.

In order to improve the above problems, in the present invention, a two-stage ball stud forging cold forging can be easily processed by forging a two-stage ball stud having a constricted waist in the middle in a cold state, and the same. The purpose is to provide a processing method used.

In order to achieve the above object, the present invention provides a process for processing a primary processed product, in which a rod is placed in a first lower mold and the first upper mold is lowered to form a ball at an intermediate portion of the rod; Inserting and mounting the primary processed product primary processed by the processing step into the inner carbide die of the inner die of the secondary lower fixed mold; The inner taper punch, which is formed of a plurality of split pieces, which descends from the upper side of the second lower fixed mold to which the primary processed product is mounted and is in close contact with the upper surface of the inner die, slides along the inner tapered surface of the punch and is collected into the center. A lowering step of the second upper moving mold to cover one end of the first processed product; A two-stage ball forming process for forming a two-stage ball by an inner punch provided on the inner side of the punch by the continuous lowering of the secondary upper moving mold; Forming recesses in the upper surface of the finished product by punching pins in a continuous lowering of the upper upper mold; As the secondary upper moving mold is raised, the lower inner taper punch of the punch is relatively lowered, and a gap is formed along the tapered surface, so that the finished product having a ball, a waist and a double ball is easily separated and discharged. Two-stage ball stud features a machining method using a split mold for cold forging.

The present invention for achieving the processing method is a forging mold consisting of an upper movable mold and a lower fixed mold, the lower fixed mold including an inner die and a carbide die inserted into the inner die; Corresponding to the lower fixed mold, the spacer and the inside punch and the inside taper punch is installed therein and interlocked punch is inserted into the slide operation, the upper portion is in close contact with the spacer close to transmit pressure Upper moving mold; And a compression spring provided between the lower end of the upper movable mold and the stepped portion of the punch to provide an elastic force to mutually relax.

In the present invention, the upper movable mold corresponds to the inner die of the lower fixed mold, and a tapered surface of the lower light upper side is formed in the lower inner diameter, and a punch having a stepped portion formed on the outer side thereof; An inner taper punch in which a plurality of split pieces are combined to move up and down along the tapered surface of the punch and at the same time to contract and relax in the center direction; An inner punch positioned on an upper side of the inner taper punch and installed on an inner diameter portion of the punch and having a slide operation and having a two-stage ball forming portion; Located in the upper portion of the inside punch and installed in the inner diameter portion of the punch includes a spacer for the slide operation to transfer the pressure of the upper movable mold to the inside punch.

In the present invention, the inside taper punch is divided into a plurality of pieces; Between each of the adjacent divided pieces is characterized in that the opening spring for applying an elastic force in the opening direction.

In the present invention, the inside of the divided piece forming the inside taper punch is characterized in that the protrusion provided to form a waist between the two-stage ball and one end of the finished product.

In the present invention, the lower end of the punch to prevent the separation of the inside taper punch, characterized in that the central portion is provided with a separation prevention cover perforated hole so that the inner die of the lower fixed mold can be inserted.

In the present invention, the inner punch of the upper movable mold is a central hole is drilled in the center, the central hole is inserted into the punch pin to form the groove portion of the finished product, the lower fixed mold inner die and the carbide die in the center of the die The through-holes are characterized in that the pin is provided to support the lower end of the primary processed product.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the shape of a two-stage ball stud processed according to the present invention, wherein one end ball 311 and two-stage ball 321 are formed, respectively, with a narrow waist portion 322 formed therebetween. Forging is not easy to shape.

Therefore, in the present invention, the shape of the one end ball 311 and the second ball 321 is processed and easily detached in order to enable forging work corresponding to the shape.

2 is a cross-sectional perspective view showing the internal configuration of the embodiment of the present invention mold, Figure 3 is a cross-sectional view showing the internal configuration of the mold of the present invention is composed of the upper movable mold 100 and the lower fixed mold (200).

The lower fixing mold 200 includes an inner die 210 and a cemented carbide die 220 inserted into the inner die 210.

The upper end portion of the cemented die 220 is formed with a one end ball storage portion 221 to maintain the shape of the one end ball 311 is processed primary.

The upper movable mold 100 corresponding to the lower fixed mold 200 has a spacer 110, an inside punch 130, and an inside taper punch 120 installed therein, and a punch 110 interlocked with each other. The slide is configured to operate.

The upper movable mold 100 is a cylindrical shape, the upper side is in close contact with the spacer 140 is closed to transmit the pressure.

A compression spring 170 is provided between the lower end of the upper movable mold 100 and the stepped portion 112 of the punch 110 to provide an elastic force to mutually relax.

The upper movable mold 100 corresponds to the inner die 210 of the lower fixed mold 200, and a tapered surface 111 of the lower light upper side is formed on the lower inner diameter thereof. A punch 110 in which the stepped portion 112 is formed; An inner taper punch 120 in which a plurality of split pieces 121 are combined to move up and down along the tapered surface 111 of the punch 110 and at the same time to contract and relax in the center direction; Located inside the upper taper punch 120, the inner punch 130 is installed in the inner diameter portion of the punch 110, the slide operation is provided with a two-stage ball forming portion 132; Located on the inside of the inner punch 130 and installed in the inner diameter portion of the punch 110 is configured to include a spacer 140 for transmitting the pressure of the upper movable mold 100 to the inside punch 130. .

The inside tapered punch 120 is divided into a plurality of pieces 121; A gap spring 123 is provided between the adjacent divided pieces 121 to apply an elastic force in the gap direction.

In the embodiment of the present invention, the number of the divided pieces 121 is four, but the number of divided pieces may be added or subtracted according to the standard.

The protrusion 122 is formed inside the split piece 121 forming the inside taper punch 120 to form a waist 322 between the second ball 321 and the one end ball 311 of the finished product 320. have.

Therefore, the secondary molded forging is possible by supporting the primary molded article while maintaining the shape of the first molded end ball 311.

The lower end portion of the punch 110 to prevent the separation of the inside taper punch 120, the central portion of the lower fixing mold 100, the inner prevention hole (151) is perforated to prevent the separation cover to be inserted ( 150).

The inner punch 130 of the upper movable mold 100 is punched with a central hole 131 in the center, and the central hole 131 forms a recess 323 of the finished product 320 in the central hole 131. ) Is inserted and installed, the mill pin to support the lower end of the primary processed product 310 in the through-hole 215 that is drilled in the center of the inner die 210 and the carbide die 220 of the lower fixed mold 200 230 are inserted in each.

It looks at the effects of the present invention configured as described above.

Figure 4 is a cross-sectional view showing a forging process for producing a primary processed product by the primary mold for carrying out the present invention, a) is a state diagram in which the material rod 300 is mounted in the primary lower mold, b) is The first upper mold is lowered to form the first processed product 310 having the one end ball 311 as a state diagram of forming a material rod 300 into the first lower mold 400, and the first upper mold 410. It shows the process of processing the primary processed product 310 to form a ball (311) in the middle portion of the material rod 300 by lowering.

At the center of the first lower mold 400 and the first upper mold 410, the first lower mold mill pin 401 and the first upper mold punch pin 411 for the input and smooth processing of the material rod 300 is Each is provided.

 Figure 5 is a cross-sectional view showing the operating state step by step forging process according to an embodiment of the secondary mold according to the present invention.

a) shows a state in which the primary processing product is mounted on the lower fixed mold. The inner die 210 of the secondary lower fixed mold 200 is replaced with the primary processed product 310 processed by the primary processing process. The inner carbide die 220 of the mounting process is achieved.

b) shows a state in which the upper movable mold is lowered in contact with the inner die of the lower fixed mold, and lowered from the upper side of the secondary lower fixed mold 200 on which the primary processed product 310 is mounted. Inside tapered punch 120 made of a plurality of divided pieces 121 to be in close contact with the upper surface of the 210 is collected along the inner tapered surface 111 of the punch 110 to the center of the primary processed product 310 As shown in FIG. 5C), the inner tapered punch is raised along the tapered surface to enclose the primary processed product as shown in FIG. 5C. It becomes a state.

d) shows a state in which the inner punch is lowered to form the two-stage ball 321 and the recess 323 is formed by the punch pin 160.

That is, at the same time as the two-stage ball forming process for forming the two-stage ball 321 by the inner punch 130 provided on the inside of the punch 110 to the continuous lowering of the secondary upper movable mold 100 As a result of the lowering of the vehicle upper movable mold 100, a process of forming the recess 323 on the upper surface of the finished product 320 is performed by the punch pin 160.

When the forging process of the two-stage ball stud finished product 320 is completed through such a work process, the second upper moving mold 100 is raised.

5 e) shows a state in which the inner taper punch is radially opened and the finished product is separated from the mold as the upper movable mold is raised, and the lower inner taper punch 120 of the punch 110 is relatively lowered and tapered. Opening is made along the (111) is a one-way ball 311 and the waist 322 and the end product 321 formed with a double ball 321 is easily separated and discharged is made.

That is, the divided pieces 121 are radially radiated from the center by the plurality of divided pieces 121 constituting the inside taper punch 120 and the opening springs 123 inserted between the divided pieces 121. By opening the finished product 320 of the two-stage ball shape as shown is to be easily discharged.

As described above, the present invention makes it possible to easily process a two-stage ball stud including two ball shapes by cold forging, thereby significantly reducing material costs, and minimizing material loss rate. In particular, it aims to increase productivity per unit time and allow mass production of products of uniform quality.

As described above, the present invention provides a two-stage ball stud split die for cold forging and a processing method using the same, in which a two-stage ball stud having a narrow waist portion in the middle portion can be easily forged by cold working. The material cost is low by the forging method, the productivity per unit time is very high, the uniformity of the product can be maintained, the mechanical properties of the product are excellent, there is almost no defect rate, and the surface roughness is better than the processed surface of the cutting product. It is a very useful technology to enable mass production of uniform two-stage ball studs with excellent adhesiveness after plate assembly due to the characteristics of the cold forged material.

Claims (7)

In the forging mold consisting of the upper movable mold and the lower fixed mold, A lower fixed mold (200) comprising an inner die (210) and a carbide die (220) inserted into the inner die (210); Corresponding to the lower fixed mold 200 to form a waist 140 between the spacer 140 and the inner punch 130 and the second ball 321 and one end of the finished product 320 and the one end 311 inside. A divided piece 121 having a protrusion 122 and divided into a plurality of pieces; The inner taper punch 120 having an opening spring 123 for applying an elastic force in the opening direction is installed between the adjacent divided pieces 121 so as to interlock with each other. It is operated, and the upper portion as the tubular portion is in close contact with the spacer 140 to close the pressure transfer mold 100; Split for two-stage ball stud cold forging process comprising a compression spring 170 is provided between the lower end of the upper movable mold 100 and the stepped portion 112 of the punch 110 to provide an elastic force to mutually relax action. mold. The method of claim 1, The upper movable mold 100 The tapered surface 111 of the lower light upper side is formed in the lower inner diameter at the inner side of the lower fixing mold 200, and the punch having the stepped portion 112 formed at the outer side thereof. 110; An inner taper punch (120) in which a plurality of split pieces (121) are combined to move up and down along the tapered surface (111) of the punch (110) and at the same time to contract and relax in the center direction; Located inside the upper taper punch 120, the inner punch 130 is installed in the inner diameter portion of the punch 110, the slide operation is provided with a two-stage ball forming portion 132; Located in the upper portion of the inside punch 130 and installed in the inner diameter portion of the punch 110 is a two-stage ball including a spacer 140 for transmitting the pressure of the upper movable mold 100 to the inside punch (130). Split mold for stud cold forging. delete delete The method of claim 2, The lower end portion of the punch 110 to prevent the separation of the inside taper punch 120, the central portion of the lower fixing mold 100, the inner prevention hole (151) is perforated to prevent the separation cover to be inserted ( Split mold for cold forging, two-stage ball stud characterized in that it comprises a 150). The method of claim 1, The inner punch 130 of the upper movable mold 100 is punched with a central hole 131 in the center, and the central hole 131 forms a recess 323 of the finished product 320 in the central hole 131. ) Is installed, The mill pin 230 is inserted into the through hole 215 in the center of the inner die 210 and the cemented die 220 of the lower fixed mold 200 to support the lower end of the primary processed product 310. The two-stage ball stud split die for cold forging. Put the material rod 300 into the primary lower mold 400, the primary processed product 310 to form a ball 311 in the middle of the material rod 300 by lowering the primary upper mold 410 ) Processing process; Inserting and mounting the primary processed product 310 processed by the machining process into the inner cemented die 220 of the inner die 210 of the second lower fixed mold 200; Inside taper punch 120 made of a plurality of divided pieces 121 are lowered from the upper side of the second lower fixed mold 200 on which the primary processed product 310 is mounted and adhered to the upper surface of the inner die 210. Descending step of the secondary upper moving mold 100 to slide along the inner tapered surface 111 of the punch 110 to be gathered toward the center to surround one end of the primary processed product 310. A two-stage ball forming process for forming the two-stage ball 321 by the inner punch 130 provided inside the punch 110 by the continuous lowering of the secondary upper moving mold 100; Forming recesses 323 on the upper surface of the finished product 320 by the punch pins 160 in order to continuously descend the secondary upper movable mold 100; As the secondary upper movable mold 100 is raised, the lower inner taper punch 120 of the punch 110 is relatively lowered, and a gap is formed along the tapered surface 111 so that the first ball 311 and the waist 322 are formed. ) And a two-stage ball stud processing method using a split mold for cold forging processing, including a step of discharging the finished product 320 is easily discharged.

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