KR950007999Y1 - Mandrel torging dies for pneumatic tool - Google Patents

Abstract

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Description

Mandrel Forging Mold for Pneumatic Tool

1 is a reference perspective view of a mandrel for a compressed air tool.

2 is a reference diagram showing a general manufacturing process of a conventional mandrel.

3 is a reference diagram showing a general forming process of the mandrel according to the present invention.

4 and 5 are a cross-sectional view and a longitudinal cross-sectional view showing the internal structure of the present invention.

6 to 14 is a manufacturing process of the mandrel according to the present invention.

Figure 15 is a cross-sectional view of the mandrel formed by the present invention.

* Explanation of symbols for main parts of the drawings

11: 1st mold 12: 2nd mold

47: first molding hole 52: second molding hole

The present invention relates to a mandrel forging die for a pneumatic tool.

In general, in compressed air tools that operate at the pressure of compressed air, mandrel suited to the purpose of use has been used for single line breaking.

In the conventional mandrel, as shown in FIG. 2, a process of processing the outer peripheral surface of the material A into a predetermined shape by cutting several times with a bite in an automatic lathe or a dedicated machining machine, and It has been produced by the step of forming a hexagonal or square chamfer (a) to the end fastened to the fastening chuck of the compressed air tool, and the step of forming a fastening groove (b) suitable for fixing means such as bolts on the tip.

The conventional mandrel is manufactured by cutting tools such as bite as described above, which has been economically burdened by the auxiliary equipment of the device, which leads to waste of manpower and time, resulting in reduced work efficiency and productivity. As a result of the increase in product cost and the cutting process, there is a disadvantage that the processing part is not precise and the quality of the product is lowered.

The present invention has been created to solve the problems of the prior art as described above provides the following object.

That is, the main purpose of the present invention is to forge a mandrel forging capable of forming a sophisticated mandrel by a series of simple processes in a simple and easy way by improving the complicated and unsophisticated shortcomings in the manufacturing of the mandrel by conventional cutting. In providing a mold.

Another object of the present invention is to provide a mandrel forging mold that can improve the precision and surface roughness of the processing portion, improve work efficiency and productivity, and reduce the cost of additional equipment.

Hereinafter, on the basis of the accompanying drawings will be more apparent in the following configuration description in detail the configuration of the subject innovation.

4 and 5 are a cross-sectional view and a longitudinal cross-sectional view showing the internal structure of the forging die 10 of the present invention, respectively.

Machine configurations other than the component members shown here are already known as conventional forging machines, and thus are not shown.

The forged die 10 of the present invention is composed of a first mold 11 and a second mold 12 installed at mutually opposite positions.

The first mold 11 includes a first pin hole 13, a second pin hole 14, and a third pin hole 15.

The first pin hole 13 and the third pin hole 15 are bushing fixing holes 16 and 17, pin guide balls 18 and 19, pin head balls 20 and 21, and pin striking holes 22 and 23. The bushing process hole (16, 17) is made of a guide bushing (24, 25) having a guide hole (26, 27) of the same inner diameter as the pin guide hole (18, 19) is fixed.

The pin guide holes 18 and 19 and the guide holes 26 and 27 of the guide bushings 24 and 25 have a first pin head hole 20 and 21 and a flanged pin head 30 and 31. The striking pin 28 and the third striking pin 29 having a hexagonal molded part 29-1 at the tip are coupled to be retractable, but the sliding striking pins 32 and 33 having flanged pin heads 34 and 35 are provided. ) Is elastically installed in contact with the pin heads (30, 31) of the first and third hit pins (28, 29) by the springs (36, 37) in the pin head holes (20, 21).

The second pin hole 14 included in the first mold 11 includes a pin head hole 38, a moving hole 39, and a hitting hole 40. At this time, the movable hole 39 is provided with a slide bushing 41 having a guide pin 43 in the center from the pin head hole 38 and having a flanged pin head 42 to be retractable, and the pin head 45. The second striking pin 44 has a fitting coupled to the guide hole 43 of the sliding bushing 41, the pin head 45 and the sliding bushing 41 of the second striking pin 44 Resilient installation is possible between the pin head 42 via the spring 46.

The second mold 12, which is located opposite the first mold 11, has an extraction pin hole 50, an shaft diameter portion 49, and an inclination portion 48 into which the extraction pin 51 is fitted. &Quot; Shaped first shaping hole 47, extraction pin hole 58 into which extraction pin 59 is fitted, hexagonal shaping portion 57, first, biaxially inclined portions 55 and 56, first and second inclinations. Having portions 53 and 54 "Consists of a second molding hole 52 of the shape.

The operation and effects of the present invention made of such a configuration will be described with reference to FIGS. 6 to 14 detailing the mandrel forming process according to the present invention.

First, the material A cut to a predetermined length is transferred to the first pin hole 13 of the first mold 11 and the first molding hole 47 of the second mold 12.

Wherein the gripping of the material (A) is not shown in the drawing, but it will be taken for granted to be positioned in a state of holding a separate material holding zone. (See Figure 6)

In this state, the first mold 11 is pressed forward.

At this time, the first bushing pin 28 pushes the sliding strike pin 32 elastically installed with the spring 36, and the guide bushing 24 along the guide hole 26 and the pin guide hole 18 of the guide bushing 24. At the same time, the hammer (not shown) strikes the sliding strike pin 32 through the strike hole 22 and the first strike pin 28 causes the material A to be retracted to the second mold ( The raw material B having the inclined portion 48 and the shaft diameter portion 49 is molded as shown in (b) of FIG. 3 while being forcibly pressed into the first molding hole 47 of 12).

At this time, the sliding bushing 41 of the second pin hole 14 is also retracted to the front end surface of the guide bushing 24 (see FIG. 7).

In this state, the first mold 11 retreats in the state in which the first molded material B is embedded in the first molding hole 47 of the second mold 12.

At this time, the first striking pin 28 and the sliding bushing 41 of the first pin hole 13 and the second pin hole 14 of the first mold 11 are moved forward to their original positions by the spring force 36 and 46. (See Figure 8.)

In this state, while raising the first mold 11, the guide hole 43 of the sliding bushing 41 located inside the second pin hole 14 and the first molding hole 47 of the second mold 12 are mutually different. The 14th mold 11 is pushed forward.

At this time, the semi-processed material B formed in the first molding hole 47 of the second mold 12 starts to be extracted by pressing the extraction pin 51 coupled to the extraction pin hole 50. See also 9)

In such a state, the semi-processing embedded in the first molding hole 47 is performed by fully extracting the extraction pin 51 coupled from the extraction pin hole 50 of the first molding hole 47 of the second mold 12. The drawn material (B) is introduced into the guide hole (43) of the sliding bushing (41), and then the first mold (11) is retracted and lowered to the second forming hole (52) of the second mold (12). Match the semi-finished material (B) to.

At this time, the first molding hole 47 of the second mold 12 is transferred to the material (A) cut to a predetermined length (see Fig. 10).

In this state, the first material 11 is pressurized and the new material A is molded into the semi-processed material B in the first molding hole 47 as well as the second pin hole 14 as described above. The sliding bushing 41 is inserted into the second molding hole 52 of the second mold 12 while inserting the semi-processed material B inserted into the guide hole 43 of the sliding bushing 41 into the second molding hole 52. The hammer (not shown) hits the second striking pin 44 through the striking hole 40 while being retracted and positioned to the front end surface of the guide bushing 24 of the 1 pin ball 13 to press the material B. Forcibly pressing down to form a semi-finished material C having a hexagonal molded part 57, first and second inclined parts 53, 54, as shown in Fig. 3C (see Fig. 11). )

In this state, the second pin hole 14 and the third pin hole 15 of the first mold 11 are formed in the first molding hole 47, the second molding hole 52, and the first molding hole of the second mold 12. The striking pin 28, the second striking pin 44, and the sliding bushing 41 are returned to the spring force of the springs 36 and 46 (see FIG. 12).

In this state, the first mold 11 is pressed forward and presses the molded material B into the first molding hole 47 of the second mold 12 while extracting (51) the first mold 11 of the first mold 11. The sliding hitting pin 33 is inserted into the guide hole 43 of the sliding bushing 41 and simultaneously strikes the sliding strike pin 33 and the third strike pin 29 coupled to the inside of the third pin hole 15 of the first mold 11. The second molding hole of the second mold 12 by the hexagonal molding protrusion 29-1 formed at the tip of the third strike pin 29 by the impact of the hammer (not shown) through the ball 23 (52) A mandrel D, which is a finished product, is formed by forming a hexagonal chamfer 29-2 in the material C formed therein as shown in FIG. 3E. (See FIG. 13)

In this state, the material B formed in the first molding hole 47 of the second mold 12 is extracted from the guide hole 43 of the sliding bushing 41 of the first mold 11. The first mold 11 is retracted and lowered while being drawn in by the pressing force of the second mold 12, and the extracted mandrel D of the second mold 12 is extracted by the extraction pin 59, as shown in FIGS. The mandrel D of the finished product is manufactured and molded (see Fig. 14).

The next process is performed continuously in the order shown in FIGS. 10 to 14 during the above process to produce a repetitive finished mandrel (D).

As described above, the forging die 10 of the mandrel for the compressed air tool improves the conventional complicated and intricate cutting process, thereby adopting the plastic processing in which the product is completed by a series of continuous batch processes, thereby greatly improving productivity. It is obvious that the invention is subscribed to effects such as being able to be manufactured economically.

Claims (1)

The first mold 11 and the second mold 12 in a mutually opposite position, the first mold 11 is the first pin hole 13, the second pin hole 14, the third pin hole 15 The second mold 12 includes a first molding hole 47 and a second molding hole 52. In the forging mold, the first pin hole 13 and the first mold 11 of the first mold 11 are formed. The three-pin hole 15 is composed of bushing fixing holes (16, 17), pin guide holes (18, 19), pin head holes (20, 21) and pin strike holes (22, 23), the bushing process hole ( 16 and 17, the guide bushing (24, 25) having the guide hole (26, 27) of the same inner diameter and the pin guide hole (18, 19) is fixed to the pin guide hole (18, 19) and the guide In the guide holes 26 and 27 of the bushings 24 and 25, the pin head holes 20 and 21 are used to form a first strike pin 28 and a third strike pin having a hexagonal shaped protrusion 29-1 at the tip. (269) is made by elastically installed by the sliding strike pins (32, 33) and the springs (36, 37), the second pin hole (14) included in the first mold 11 is a pin It has a de-hole 38, a moving hole 39 and a hitting hole 40, the slide hole 41 having a guide hole 43 in the center from the pin head hole 38 is installed in the movable hole 39 to be retractable The second striking pin 44 is inserted into the guide hole 43 of the sliding bushing 41 and elastically installed so as to be able to move back and forth by the spring 46, and the first molding of the second mold 12 is performed. Ball 47 has an extraction pin ball 50, the shaft diameter portion 49, the inclined portion 48 to which the extraction pin 51 is fitted. "The second molding hole 52 is formed in the extraction pin hole 58, the hexagonal molding portion 57, the first, biaxial diameter portion (55, 56), the first and second extraction pin 59 is fitted With inclined portions 53, 54 " Mandrel forming mold for compressed air tool, characterized in that the shape.