KR20140093650A - Cold forging mold for clutch drum of pumping device - Google Patents

Abstract

The present invention relates to a cold forging mold for manufacturing a clutch drum of a pumping device to form a ring type forging material, which has a hole along the length direction through a piercing process and is cut to have a fixed thickness and then is annealed and lubricated, into the clutch drum of a pumping device. The cold forging mold of the present invention includes a lower mold comprising a mounting groove where the forging material is mounted, and an upper mold which performs cold forging molding of the forging material in the case of being connected with the lower mold. The lower mold includes: a die which has an internal diameter equal to an outer diameter of the punch and restricts an outer diameter expansion range of the forging material in the case of molding the forging material; a mandrel which is located in the die and restricts an internal diameter reduction range by being inserted into the forging material; a die block for supporting the die from the outside; a pin guide hole which forms a protrusion by accommodating a part of the forging material in parallel with the transportation direction of the punch by being linked to a mounting groove between the die and the mandrel; a knock out pin which performs straight line motion along the pin guide hole, and extracts the clutch drum by contacting the protrusion selectively; and a knock out block which is linked with the knock out pin.

Description

Technical Field [0001] The present invention relates to a cold forging mold for a clutch drum of a pumping device,

The present invention relates to a cold forging die for manufacturing a clutch drum of a pumping device, and more particularly, to a cold forging die for producing a clutch drum in which a durability is deteriorated due to low tensile strength and shear strength due to a sintering method Thereby improving the mechanical performance of the punching device.

As the demand for the expansion of the luxury sedan and the lightening of the electric vehicle are increased with regard to the automobile sales market, the parts are fixed and lightweighted at the same time in order to improve the stability and ride comfort of the seat parts.

A clutch drum requiring more than 20 million pieces per year is a part of a pumping device for adjusting the height of an automobile seat, and is configured to be interlocked by the operation of a lever.

That is, the clutch drum is configured to transmit the force generated by the lever operation to the clutch portion and return to the original state when the force applied to the lever is removed.

Accordingly, as shown in FIG. 1, the clutch drum 1 is formed with a plurality of protrusions 2 so as to be able to interfere with a counterpart during rotation.

The plurality of projections 2 have a high degree of difficulty because they have a high step.

Therefore, a sintering process is used to ensure productivity and high accuracy.

However, the clutch drum 1 has the following problems due to the molding method using the sintering process.

That is, as shown in FIG. 2, the conventional clutch drum 1 is manufactured by sintering a powder material, and therefore, it contains many pores and has a martensite structure, so it is vulnerable to tensile strength and shear force.

Therefore, when the user operates the lever to apply a strong shearing force to the clutch drum 1, the protrusion 2 is damaged.

In addition, since the sintering process must be performed at a proper temperature using a powder material, the working environment is poor and productivity is reduced.

In addition, the manufacturing cost is increased due to the above reasons, which is not preferable from the economical point of view.

FIG. 1 is a perspective view showing the appearance of a clutch drum of a pumping device, and FIG. 2 is a microstructure photograph of a pumping device manufactured according to a conventional technique.

Among the automobile parts having similar shapes and functions to those of the clutch drum 1, there are a clutch, a crown gear and the like.

The clutch is disclosed in Korean Patent Laid-Open Publication No. 10-2008-0074802. The metal powder is charged into the die, compression molded, and the clutch is manufactured through the sintering and cooling process.

The crown gear is a part used in a power transmission system of an automobile and acts as a shear force like the clutch drum 1 and is disclosed in Korean Patent Laid-Open Publication No. 10-2008-0011707.

The crown gear also has a structure in which a shear force is applied to a plurality of teeth protruding forward.

When the sintering process is applied to a component to which such a shear force acts, it is advantageous to form a complicated shape, but it is difficult to increase the dimensional accuracy and possibility of breakage due to the internal pore is undesirable.

It is an object of the present invention to solve the problems of the prior art as described above and to provide a clutch drum having a low durability due to low tensile strength and shear strength as manufactured by a sintering method, And to provide a cold forging die for manufacturing a clutch drum of a pumping device which is improved in performance.

A method of manufacturing a clutch drum using a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention includes a step of preparing a raw material for preparing a raw material, a piercing process for forming a hole by piercing the raw material, A cutting step of cutting a forged material to a predetermined thickness to form a forged material, an annealing step of annealing the forged material, and a lubricating step of applying an lubricating coating to the annealed forged material, A step of forming a clutch drum by forming a clutch drum by a cold forging method using the combination of a lower mold and an upper mold after placing the piston in a seating groove which is a constitution of a cold forging die for producing a clutch drum of a pumping device, And a take-out step of taking out to the outside.

The take-out step is a process in which the clutch drum is taken out of the lower mold by linear motion of the knockout pin provided in the lower mold.

And the knockout pin contacts the end of the protrusion formed on the clutch drum in the takeout step.

And the knockout pins are provided in a size and in a number corresponding to the protrusions in the takeout step.

In the forging step, the protrusions of the clutch drum are formed in the same direction as the advancing direction of the punch and are separated from the knockout pin.

And the forging step is formed with a molding load of 150 to 300 tons.

The forging step is characterized by molding with a stroke minuteness of 20 to 60 SPM.

And the take-out step is a step of advancing the die in a direction opposite to the projection forming direction and taking the clearance drum out of the mold.

In the material preparation step, the lubricating coating is characterized in that a phosphate coating is adopted.

The present invention relates to a lower mold having a hole formed in a piercing process and cut to have a predetermined thickness and then having a seating groove for accommodating therein an annealed and lubricated forged material, A lower die having a seating groove in which the forging material is seated, and a lower die positioned inside the die and forging the die, A knockout pin inserted into the seating groove to take out the clutch drum; and a knockout pin inserted into the seating groove to receive the knockout pin, And a die block which accommodates and restricts an outer diameter enlargement range.

And a pin guide hole communicating with the seating groove and guiding a linear movement direction of the knockout pin is provided at one side of the die.

The plurality of pin guide holes and the knockout pins may be disposed on the same straight line.

And the plurality of knockout pins are simultaneously moved in conjunction with the knockout block.

And the knockout pin is linearly moved in a direction opposite to the direction of formation of the protrusions to take out the clutch drum.

The present invention relates to a method for improving the mechanical performance of a clutch drum in which durability is lowered due to low tensile strength and shear strength due to a sintering method, .

Accordingly, the manufacturing process is simplified, productivity is improved, and mechanical properties, particularly shear strength, are improved.

In addition, since the defective rate is remarkably reduced and a low-priced material is adopted, the manufacturing cost can be advantageously reduced.

1 is a perspective view showing the appearance of a clutch drum of a pumping device;
FIG. 2 is a photograph of a microstructure of a pumping device fabricated according to the prior art; FIG.
3 is a photograph of a clutch drum manufactured according to a preferred embodiment of the present invention.
4 is a vertical sectional view showing the internal structure of a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
5 is an exploded vertical cross-sectional view of a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
6 is a vertical cross-sectional view showing a coupling relationship between a die and a knockout pin as one component in a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
7 is a process flow diagram illustrating a method of manufacturing a clutch drum using a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
FIG. 8 is a photograph showing a step of preparing a material for a clutch drum using a cold forging mold for manufacturing a clutch drum of a pumping device according to the present invention, in detail.
9 is a longitudinal sectional view showing a mold state in a forging step as one step in a method of manufacturing a clutch drum using a cold forging mold for manufacturing a clutch drum of a pumping device according to the present invention.
FIG. 10 is an analysis chart comparing the formability of the clutch drum according to the stroke change during the single-stage forging step in the method of manufacturing the clutch drum using the cold forging die for producing the clutch drum of the pumping device according to the present invention.
11 is a longitudinal sectional view showing a state in which an upper mold and a lower mold are separated from each other in a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
12 is a longitudinal sectional view showing a state in which a clutch drum is taken out from a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.
FIG. 13 is a perspective view showing a clutch drum manufactured according to a preferred embodiment of the present invention in a state of being assembled with a counterpart; FIG.

The configuration of the clutch drum 10 will be described below with reference to Fig. 2 attached hereto.

FIG. 2 shows a microstructure photograph of a part of a pumping device manufactured according to the prior art.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of the term in order to describe its invention in the best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

As shown in the figure, the clutch drum 10 has a substantially ring shape whose center portion is perforated in a circular shape, and a plurality of projections 12 are formed radially on the upper surface.

The clutch drum 10 is made of SCM415 as an embodiment of the present invention, and is made of a cold forging die (100 in Fig. 4) forging and lubrication coated forging materials (see 18 in Fig. 6) And is molded in a cold forging process.

The constitution of the cold forging mold 100 will be described with reference to FIGS. 4 to 6 attached hereto.

4 is a vertical cross-sectional view showing the internal construction of a cold forging die 100 for manufacturing a clutch drum of a pumping device according to the present invention. FIG. 5 is a longitudinal cross-sectional view of the cold forging die 100 for manufacturing a clutch drum of the pumping device according to the present invention, And FIG. 6 is a longitudinal sectional view showing a coupling relationship between a die and a knockout pin, which is a component of a cold forging die for manufacturing a clutch drum of a pumping device according to the present invention.

As shown in these drawings, the cold forging die 100 is made of SCM415, and a hole is formed in a piercing process (S140). After cutting the slab to have a predetermined thickness, And a lower mold 120 having a lower mold 120 and a lower mold 120. The upper mold 140 selectively molds the forging material 18 by cold forging.

The upper upper metal mold 140 includes a punch 142 for pressing the upper surface of the forging material 18 downwardly, a punch holder 144 for holding and holding the punch 142 therein, And a punch block 146 inserted into the punch 142 to prevent the punch 142 from being released.

The lower end of the punch 142 has a ring shape corresponding to the lower surface of the clutch drum 10 as viewed in Figure 3. The punch 142, the punch holder 144, and the punch block 146 are integrated And is reciprocated linearly in the up / down direction.

A lower mold 120 is provided on the lower side of the upper mold 140. The lower mold 120 has a seating groove 121 in which a forging material 18 is seated at the upper center and accommodates a lower portion of the punch 142 to enable cold forging of the forging material 18 .

More specifically, the lower mold 120 includes a mandrel 122 inserted into the forging material 18 to limit a reduction range of the inner diameter, and a mandrel 122 having the forged material 18 therein, A die block 123 provided outside the die 124 to support the outward deformation of the die 124 so as to limit the deformation of the die 124 and to support the die 124 and the die block 123, A die holder 125 and a die case 126 for receiving and protecting the die 124, the die block 123 and the die holder 125, A knockout pin 130 for drawing the clutch drum 10 formed in the cold forging die 100 to the outside by a linear reciprocating motion, a knockout 127 interlocked with the knockout pin 130, An anvil 128 coupled to a lower portion of the vane 125 to allow the lower metal mold 120 to be installed in a forging facility, Linear reciprocating motion at the side and is configured to include a knock-out block 129 to interlock in combination with the knockout (127).

The lower mold 120 has a seating groove 121 at the upper center thereof and a punch 142 at the upper side of the seating groove 121.

Therefore, when the punch 142 presses the forging material 18 in a state where the forging material 18 is seated in the seating groove 121, the forging material 18 has a shape as shown in FIG. 3, .

The seating groove 121 is a space formed by a plurality of parts. That is, the seating groove 121 refers to a space formed by the mandrel 122, the die 124 and the knockout pin 130, and the height of the actually manufactured clutch drum 10 is equal to the height of the mandrel 122 and the die (124) and the knockout pin (130).

The knockout pin 130 is disposed so as to be spaced apart from the projection 12 of the clutch drum 10 formed by the interaction of the punch 142 and the die 124, .

Therefore, when the clutch drum 10 is to be taken out, the knockout pin 130 selectively reciprocates linearly to push the protrusion 18 upward.

The mandrel 122 prevents the inner diameter from being reduced by keeping the punch 142 inserted into the center of the forging material 18 when the forging material 18 is pressed.

The diameter of the die 124 is not limited to the height of the projections 18, but limits the outer diameter and the outer shape of the clutch drum 10. [

That is, the die 124 limits the enlargement range of the outer diameter when the forging material 18 is deformed into the shape of the clutch drum 10. [

9, when the punch 142 is lowered downward and is pressed while shielding the upper portion of the seating groove 121, the forging material 18 is filled with the shape corresponding to the seating groove 121, 10) can be formed.

The lower mold 120 has a function of taking out the clutch drum 10 upward when the forming of the clutch drum 10 is completed by the combination of the upper mold 140 and the lower mold 120.

That is, the knockout pin 130, the knockout 127, and the knockout block 129 are configured to be linearly reciprocating in the up / down direction at the center of the cold forging die 100.

Accordingly, when the knockout pin 130 is positioned as shown in FIG. 4, the upper end of the die 124 provides sufficient space for the protrusion 18 to be formed. When the knee-out pin 130 linearly moves upward as shown in FIG. 12 The clutch drum 10 can be taken out.

Referring to FIG. 5, the die 124 and the knockout pin 130 are coupled to each other. A pin guide hole H is formed at the center of the die.

The pin guide holes H are formed to communicate with the seating grooves 121 and are formed at a plurality of positions corresponding to the positions where the projections 18 are to be formed to guide the forming direction of the projections 18.

The knockout pin 130 is inserted into the pin guide hole H so as to be linearly movable.

Therefore, the pin guide hole H has a shape corresponding to the outer shape of the knockout pin 130, and is formed to have the same or slightly smaller size as the knockout pin 130.

A method of manufacturing the clutch drum using the cold forging die 100 will now be described with reference to FIGS.

FIG. 7 is a flow chart showing a method of manufacturing a clutch drum using a cold forging die 100 for manufacturing a clutch drum of a pumping device according to the present invention, FIG. 8 is a flowchart illustrating a method of manufacturing a cold forging die 100 for manufacturing a clutch drum of a pumping device according to the present invention, FIG. 9 is a view showing a process of manufacturing a clutch drum using a cold forging die 100 for manufacturing a clutch drum of a pumping device according to the present invention. Fig. 7 is a longitudinal sectional view showing the state of the mold in the forging step. Fig.

As shown in the accompanying drawings, the clutch drum 10 includes a material preparing process S120 for preparing a raw material 14, a piercing process S140 for forming a hole by piercing the raw material 14, (S160) for cutting the raw material (14) having a predetermined thickness to form a forging material (18), an annealing process (S180) for annealing the forging material (18) A material preparing step S100 of lubricating the material 18 with a lubricating process S190; and a step of setting the forging material 18 in a seating groove, which is a constituent of the cold forging die 100 for producing a clutch drum of the pumping device, A forging step S200 for forming the clutch drum 10 by forming the lower die 120 and the upper die 140 using the cold forging method using the combination of the lower die 120 and the upper die 140, And a take-out step (S300) for taking out to the outside of the forging die (100).

In the embodiment of the present invention, the raw material 14 adopts a cylindrical rod made of SCM415 as shown in FIG. 8, and the hole 16 is pierced through the center portion through the piercing process (S140).

The hole 16 is configured to receive the mandrel 122 when the forging material 18 is seated on the lower mold 120 and is configured to have an inner diameter larger than the outer diameter of the mandrel 122.

After the piercing process (S140), a cutting process (S160) is performed. The cutting process S160 is a process of cutting a raw material 14 having a substantially pipe shape by a predetermined height in a piercing process S140 so as to have a ring shape.

Then, the forging material 18 undergoes an annealing process (S180) and a lubrication process (S190). The lubrication process (S190) is for facilitating cold forging and reducing defects. In the embodiment of the present invention, the lubricant coating is a phosphate coating.

The forging material 18 manufactured through the above-described processes is subjected to a forging step S200. The forging step S200 is a step of molding the clutch drum 10 by seating the forged material 18 coated with the phosphate coating in the seating groove 121 and then closing the upper mold 140 and the lower mold 120.

At this time, the mandrel 122 is inserted into the hole 16, and the molding drum of the clutch drum 10 is formed by generating a molding load of 150 to 300 tons.

And the stroke per minute is applied within the range of 20 ~ 60 SPM (Stroke Per Minute).

Referring to FIG. 10, when the result of analyzing the formability of the clutch drum 10 according to the stroke change during the forging step S200, when the stroke is 0.9 mm, the formation of the projections is incomplete, but when the stroke is 1.7 mm The protrusions were formed in a satisfactory state.

11 is a vertical sectional view showing a state in which the upper mold 140 and the lower mold 120 are separated from each other in the cold forging mold 100 for manufacturing a clutch drum of the pumping device according to the present invention. When the mold 140 is moved upward and the upper part of the seating groove 121 is opened, the taking-out step S300 is performed.

The take-out step S300 may be performed by moving the knockout pin 130 in the upward direction to upwardly push the lower end of the clutch drum 10 upward so that the clutch drum 10 is rotated from the mounting groove 121, This is the process to get it out.

As a result of coupling the clutch drum 10 manufactured in accordance with the preferred embodiment of the present invention with the mating member, it is possible to form the clutch drum 10 having excellent cohesiveness And it was confirmed that the dimensional precision was high.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

For example, in the embodiment of the present invention, the forging material SCM415 is adopted, but it is needless to say that various materials can be applied.

10. Clutch drum 12. Revolution
14. Original Material 16. Hole
100. Cold Forging Mold 120. Lower Mold
121. Retaining groove 122. Mandrel
123. Die block 124. Die
125. Die holder 126. Die case
127. Knockout 128. Anvil
129. Knockout block 130. Knockout pin
140. Upper mold 142. Punch
144. Punch holder 146. Punch block
S100. Material preparation phase H. pin guide hole
S120. Material preparation process S140. Piercing Course
S160. Cutting process S180. Annealing process
S190. Lubrication process S200. Forging step
S300. Take-out step

Claims (4)

A cold forging die for manufacturing a clutch drum of a pumping device for forming a hole in a longitudinal direction through a piercing process and cutting a ring-shaped forging material subjected to an annealing treatment and a lubricating treatment into a clutch drum of a pumping device ,
A lower mold having a seating groove on which the forging material is seated and an upper mold having a punch for pressing the forging material to perform cold forging molding of the forging material with the lower mold,
The lower mold,
A mandrel having an inner diameter equal to an outer diameter of the punch and limiting an outer diameter enlargement range of the forging material when the forging material is formed; a mandrel disposed inside the die and inserted into the forging material to limit an inner diameter reduction range; A pin guide hole communicating with the seating groove between the die and the mandrel and accommodating a part of the forging material in parallel with the conveying direction of the punch to form a projection; And a knock-out pin for selectively removing the clutch drum from the clutch drum, and a knock-out block interlocking with the knockout pin. The punching tool of claim 1, wherein the plurality of pin guide holes and the knockout pins are disposed in the same straight line. 3. The cold forging die according to claim 2, wherein the plurality of knockout fins move simultaneously with the knockout block. 4. The cold forging die for a clutch drum of claim 3, wherein the knockout pin linearly moves in a direction opposite to the direction of the protrusions to take out the clutch drum.

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