KR100661294B1 - Bolt formation method - Google Patents

Abstract

A forming method of connection bolts for furniture is provided to improve productivity and lower production cost by continuously forming a body part and a cross grooved head part on an outer peripheral surface of a workpiece by one equipment through a body part forming step, a workpiece transfer step, a primary head part forming step, a head part completion step and a connection bolt separation step. A forming method of connection bolts for furniture comprises: a body part forming step(100) of forming a body part and a catching projection on a workpiece; a workpiece transfer step(200) of feeding a new workpiece to the upper groove while a punch sleeve moves a workpiece from an upper groove to a lower groove; a primary head part forming step(300) of pressing a front end of the body part of the workpiece placed on the lower groove to form a head part and pressing the new workpiece placed on the upper groove to form a head part to form a body part and a catching projection at the same time; a head part completion step(400) of pressing the head part of the workpiece placed on the lower groove to complete a cross grooved head part and allowing the body part of the new workpiece placed on the upper groove to be gripped by a punch sleeve at the same time; and a connection bolt separation step(500) of moving the body part of the new workpiece to the lower groove, and completing one process by separating a completed connection bolt inserted into the lower groove while an other workpiece is supplied to the upper groove.

Description

Forming bolt for furniture connection {Bolt formation method}

1 is a front sectional view of an apparatus used in the molding method of an embodiment of the present invention;

2 is a side view of the apparatus used in the molding method of an embodiment of the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a front view of the connecting bolt made by the molding method of an embodiment of the present invention

Figure 5 is a block diagram showing a molding method of an embodiment of the present invention

6a to 6c is a process diagram showing the body portion forming step of one embodiment of the present invention

7a to 7c is a process diagram showing a connection bolt transfer step of an embodiment of the present invention

8a to 8b is a process chart showing a primary head forming step of an embodiment of the present invention

9a to 9c is a process chart showing the head completion step of an embodiment of the present invention

10a to 10b is a process diagram showing the connection bolt separation step of an embodiment of the present invention

<Code Description of Main Parts of Drawing>

10: fixing rod 11: upper groove

12: lower groove 13: eject pin

20: mobile unit 30: body forming means

31: forming part of the body 32: forming groove

33: push pin 40: head pretreatment means

41 chuck housing 42 housing sleeve

43: Chuck Spring 44: Chuck

45: punch sleeve 46: head pretreatment punch

47: punch pressing rod 48: gap holding region

50: head forming means 51: cross punch

52: cross projection 100: the body forming step

200: raw material transfer step 300: primary head molding step

400: head completion step 500: connection bolt separation step

The present invention relates to a method for forming a connecting bolt for furniture, and more particularly, by making the body of the connecting bolt in the upper fixing rod and moving it to the lower fixing so that the head having a cross groove is continuously made, the body and the head can be separated and manufactured. The present invention relates to a method for forming a connection bolt for furniture, which is superior in productivity.

Generally, the connecting bolt for furniture is formed with a head having a cross groove at the front end of the body and a threaded part formed at the rear end. The body and the head are produced by a press forging method, and the rear end of the thread is produced by a rolling method.

Conventionally, the body of the connecting bolt was produced in a forging machine and then collected to form a cross groove and a head in a separate forging machine. Therefore, two forging machines are required, and in order to continuously work, the forging machines that are separated from each other must be connected to separate automation lines, thereby causing additional problems such as productivity loss and manufacturing cost increase due to additional equipment.

The present invention was developed in view of the conventional problems, an object of the present invention is to mount three punches on one feeder and to install the upper and lower two dies on which the raw material is placed on the feeder, and then the feeder While moving forwards and backwards, the body of the connecting bolt is formed on the raw material placed on the holder by moving up and down as needed, and any one of the three punches has a cross groove at the tip of the body while moving the position of the body. It is to provide a method for forming a connecting bolt for furniture that can be continuously produced by connecting the head, the connecting bolt having the body and the head in one device.

In order to achieve the above object, the present invention provides a punch for forming a body portion in a raw material placed in an upper groove, a punch for transferring the molded body portion to a lower groove, and a punch for forming a head having a cross groove at the tip of the transferred body portion. It is formed sequentially on the transfer table, while moving up and down the transfer table toward the upper and lower grooves, as needed, it is characterized in that the head portion having the body portion and the cross groove in the raw material continuously produced.

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

1 is a front sectional view of an apparatus used in the molding method of one embodiment of the present invention, and FIG. 2 is a side view of the apparatus used in the molding method of an embodiment of the present invention. The apparatus used in the molding method of an embodiment of the present invention is composed of a holding table (10) serving as a die for holding the raw material and a moving table (20) for punching the raw material into a desired shape while being elevated.

The fixture 10 is formed in two stages of the upper groove 11 and the lower groove 12 into which the raw material is inserted step by step and these serve as two dies. And the receiving groove 15 is formed on the outer periphery of the upper and lower grooves (11, 12). And the lower groove 12 is formed in the center of the chuck push projection 14 protruding higher than the surface of the holder 10, the ejection pin for separating it from the holder 10 when the molding of the raw material is completed ( 13 is provided in the lower groove 12.

The movable table 20 is formed in three stages the body forming means 30, the head pre-treatment means 40 and the head forming means 50 to serve as three punches. The trunk portion forming means 30 is formed in the center of the front end of the engaging jaw forming groove 32 and the body portion forming groove 31 in succession through the pressing piece 33 is connected to the rear.

The head pretreatment means 40 is composed of a cylindrical chuck housing 41 and a housing sleeve 42 for guiding the chuck housing 41 to be fitted forward and backward. A locking groove 41a is formed in an outer circumferential surface of the chuck housing 41, and a bolt-shaped locking hole 42a that is caught by the locking groove 41a is formed in the housing sleeve 42, and the housing sleeve 42 is formed. The inside of the chuck housing 41 is provided with a chuck spring 43 for pressing the side toward the fixture 10 and the locking groove 41a is caught by the locking hole 42a is limited to the distance ahead.

The chuck housing 41 is provided with four or three conical chucks 44 connected to the inner tip by a spring 44c, and an outer circumferential surface of the chuck 44 is an inclined surface inside the chuck housing 41. Forward and backward along 41b. And each of the chuck 44 opposing surface is formed with a body biting surface (44a) and the head shaping groove (44b) in series, and the chuck 44 to the front end of the chuck housing 41 so that the chuck 44 is not disassembled A fixed plate 44d is provided.

Inside the chuck housing 41 is a hollow punch sleeve 45 in which a tip of the raw material, which is inserted into the upper groove 11 of the fixing table 10, is inserted into the chuck housing 41. It is provided in series with the auxiliary molding groove 44b, and the head pretreatment punch 46 is embedded in the punch sleeve 45. The head pretreatment punch 46 is provided with a punch pressing rod 47 and a spacing holder 48 and a punch spring 47a interposed therebetween. The chuck 44, the punch sleeve 45, the head pretreatment punch 46 and the punch push rod 47 are embedded in the chuck housing 41. The spacing holder 48 is provided inside the chuck spring 43 of the housing sleeve 42 so that the chuck housing 41, the punch pressing rod 47, and the head pretreatment punch 46 are provided. Supporting them while being retracted toward the movable table 20 serves to primaryly shape the head 62 at the tip of the raw material.

The head forming means 50 is a head pretreatment means except that the punch sleeve 45 and the cross punch 51 having a cross projection 52 is provided in place of the head pretreatment punch 46 ( Since the same configuration as 40) will be described for convenience of the present invention using the same reference numerals. The cross punch 51 forms a cross groove for inserting a tool such as a screwdriver into the head of the connecting bolt.

The body shaping means 30, the head pretreatment means 40 and the head shaping means 50 are spaced at equal intervals and installed in the movable table 20 and the upper groove 11 of the fixing table 10 and The lower groove 12 is also spaced at equal intervals, and when the center of the body forming means 30 and the upper groove 11 coincides, the center of the head pretreatment means 40 and the lower groove 12 are When the centers of the head pretreatment means 40 and the upper groove 11 coincide with each other, the centers of the head forming means 50 and the lower groove 12 are configured to coincide.

The method for producing the connecting bolt by using the fixed base 10 having two dies and the movable base 20 having three punches is as follows.

Figure 5 is a block diagram showing a molding method of an embodiment of the present invention, by plugging the raw material into the upper groove 11 of the fixing table 10 and pressurized by the body forming means 30 of the movable table 20 Body portion forming step 100 to make the body portion 60 on the outer peripheral surface of the raw material;

The head pre-processing means 40 of the moving part 10 is made of the raw material made of the body portion 60, the bite from the upper groove 11 and then moved to the lower groove 12 of the fixing table 20 At the same time, the raw material transfer step of positioning the new raw material to the upper groove 11 at the same time;

Pressing the movable table 20 toward the fixing table 10 by the head pre-treatment punch 46 of the head pre-treatment means 40 head 62 at the tip of the raw material stuck to the lower groove 12 1) primary molding, and at the same time the primary raw material forming step 300 to press the new raw material selected in the upper groove 11 with the body forming means 30 so that a new body portion 60 is made. ;

After raising the movable table 20 and pressing it toward the fixing table 10, the cross punch 51 of the head forming means 50 has the cross section 63 of the primary head of the raw material having a complete shape. A head completion step 400 for molding into the head 62 and at the same time allowing the new body 60 to be inserted into the upper groove 11 to be inserted into the head pretreatment means 40; And

The lower groove while the head pretreatment means 40 moves out of the new trunk portion 60 to the lower groove 12 of the holder 10 and another raw material is supplied to the upper groove 11. The connection bolt separation step 500 for separating the completed connection bolts plugged into the (12) by the eject pin 13 so that one process is completed.

Production method of an embodiment of the present invention is the body forming step 100, the raw material transfer step 200, the first head forming step 300, the head completion step 400 and the connection bolt separation step 500 As the process is performed continuously, a connecting bolt having a head portion 62 having a trunk portion 60 and a cross groove 63 is continuously produced.

The production method of the embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 5 to 10.

Figure 6 shows the body portion forming step 100 of one embodiment of the present invention. 6a shows the initial position of the movable table 20, and the center of the upper groove 11 of the body forming means 30 and the fixing table 10 is coincident with each other. At this time, when the raw material is cut to a predetermined length and supplied to the center of the upper groove 11, the moving base 20 is advanced so that the rear end of the raw material is inserted into the upper groove 11 and at the same time the body forming groove 31. The body portion 60 is formed on the outer circumferential surface of the raw material and the portion of the upper groove 11 is a screw forming portion 64 to be made into a screw portion in the screw rolling machine in a post process. When the movable table 20 approaches the fixing table 10 as shown in FIG. 6C, the locking jaw 61 is formed on the raw material by the locking jaw forming groove 32. At this time, the chuck housing 41 of the head pretreatment means 40 is compressed as much as possible by the chuck pusher 14 of the holder 10 or the raw material is not bitten by the chuck 44. It does not, and since the head forming means 50 also does not touch the chuck pusher 14 there is no change.

Figure 7 illustrates the raw material transfer step 200 of one embodiment of the present invention is the core technology of the present invention. After the body 60 is formed on the raw material, the pressing piece 33 of the body forming means 30 presses the tip of the raw material while the movable table 20 is retracted, and the upper side of the fixing table 10 is formed. It keeps the plugged state in the groove (11). The pressing piece 33 prevents the trunk portion 60 from being picked up together with the trunk portion forming groove 31 while the movable table 20 is retracted.

The movable table 20 is retracted and then raised as shown in FIG. 7A so that the center of the head pretreatment means 40 coincides with the upper groove 11. Then, when the movable table 20 is advanced, the tip of the raw material plugged into the upper groove 11 is inserted into the tip of the punch sleeve 45 of the head pretreatment means 40. At this time, as the punch spring 47a is compressed, the head pretreatment punch 46 and the punch pressing rod 47 are retracted, but the raw material included in the punch sleeve 45 is pressed into the punch spring ( It is not returned by the restoring force of 47a). In addition, since the protrusion for pressing the chuck 44 of the head pretreatment means 40 is not formed in the upper groove 11, the chuck 44 does not bite the body portion 60 of the raw material.

When the trunk portion 60 of the raw material is plugged into the punch sleeve 45, the movable table 20 is retracted. At this time, the screw forming portion 64 of the raw material is separated from the upper groove 11 and then lowered and the center of the head pretreatment means 40 coincides with the lower groove 12 and at the same time new raw material is the upper groove It is supplied to (11), and it will be in the state like FIG. 7C.

8 shows a primary head forming step 300 of primary forming the head on the raw material. When the movable table 20 is advanced toward the fixing table 10, new raw materials are picked up by the body forming means 30 and the new forming material is formed by the body forming groove 31 at the same time. Body portion 60 is formed on the outer circumferential surface. At the same time, the screw forming portion 64 of the tip of the raw material attached to the punch sleeve 45 of the head pretreatment means 40 is inserted into the lower groove 12, so that the chuck 44 has the chuck push protrusion 14. ), The compression is retracted. In addition, the chuck spring 43 serves to support the chuck housing 41 so as not to be retracted and pushed while the body biting surface 44a asks the body portion 60 of the raw material to descend.

Thereafter, the movable table 20 is as close as possible to the fixing table 10 until the locking groove 41a of the chuck housing 41 touches the locking hole 42a of the housing sleeve 42. When the chuck spring 43 is compressed, the pressing force of the movable table 20 is transmitted to the head pretreatment punch 46 through the gap retaining hole 48 and the punch pressing rod 47. At this time, the tip of the raw material is compressed while being pulled out of the punch sleeve 45, and the head 62 is first molded into the raw material in the shape of the head forming groove 44b at the tip of the chuck 44.

9 shows a head completion step 400 of forming a cross groove in the head of the raw material, the primary head is formed in the raw material and the movable table 20 is retracted. Thereafter, when the moving table 20 is raised and moved forward so that the center of the head forming means 50 coincides with the lower groove 12, the head is pushed by the chuck pusher 14 of the lower groove 12. As the chuck 44 of the sub-molding means 50 is compressed, the body portion 60 of the raw material is strongly buried. At this time, the chuck spring 43 of the head forming means 50 must be strongly supported so that the chuck housing 41 is not pushed. Then, when the pressing force of the movable table 20 is maximized, the head forming means 50 is applied. The chuck spring 43 is compressed while the catching groove 41a formed in the chuck housing 41 is caught by the catching opening 42a of the housing sleeve 42. When the pressing force of the movable table 20 is transmitted to the cross punch 51 through), the raw material is compressed as much as possible, and thus the head 62 having a complete shape is formed by the head forming groove 44b of the chuck 44. At the same time, cross grooves 63 are formed in the head part 62 by the cross protrusions 52.

While the cross groove 63 is formed, the new raw material from which the trunk portion 60 is inserted into the upper groove 11 is inserted into the tip of the punch sleeve 45 of the head pretreatment means 40. The process is the same as in FIG.

10 shows a connecting bolt separating step 500 in which the connecting bolt is formed in the body portion and the head is separated from the holder 10. The raw material picked up by the lower groove 12 is moved to the eject pin 13 while the movable table 20 is retracted and then lowered so that the center of the head pretreatment means 40 coincides with the lower groove 12. It is separated from the lower groove 12 by the body portion 60 having a locking jaw 61 in the raw material and the head 62 having a cross groove 63 is made. And the new raw material selected in the head pretreatment means 40 coincides with the center of the lower groove 12 and another new raw material is supplied to the upper groove 11 so that one process is completed and such a series of processes are continuous. Repeatedly, the connecting bolts are molded in one device.

According to the present invention as described above, the head portion having a body portion and cross grooves on the outer circumferential surface of the raw material while going through the molding step, the raw material transfer step, the first head molding step, the head completion step and the connection bolt separation step Productivity is improved because it is continuously produced in the device of the device, and since it is not necessary to provide a body production unit and a head production unit separately as in the prior art, it takes up less space and reduces the production cost by reducing the cost of purchasing the device. have.

Claims (2)

delete The body forming means, the head pretreatment means and the head forming means, while moving up and down the movable stage provided with the three stages to the fixed base to make a body portion having a locking jaw to the raw material supplied to the upper groove of the fixed material To move to the lower groove to complete the head having a cross groove, A body portion forming step of forming a body portion and a locking jaw in the raw material by the locking jaw forming groove and the body portion forming groove provided in the body portion forming means; A raw material transfer step of supplying new raw materials to the upper groove while the raw material of the upper groove is moved to the lower groove by the punch sleeve provided in the head pretreatment means; At least three of the head pretreatment means are formed into a pair of chucks by pressing the raw material placed in the lower groove with a head pretreatment punch embedded in the punch sleeve to form the head shaping grooves formed on the inner surfaces of the chucks. A primary head forming step of pressing the body portion to form a head by pressing the new raw material placed in the upper groove by the body forming means to make the body portion and the locking jaw in the shape; At least three provided in the head forming means has a cross groove in the shape of the head forming groove formed on the inner surface of the chuck by pressing the head with a cross punch with a raw material placed in the lower groove with a pair of chucks. A head completion step of forming a head of a complete shape and at the same time allowing the body of the new raw material placed in the upper groove to be inserted into the punch sleeve of the head pretreatment means; And The head pretreatment means bites the body of the new raw material and moves to the lower groove, and disconnects the completed connecting bolts attached to the lower groove while another raw material is supplied to the upper groove so that one process is completed. Connecting bolt molding method for a furniture, characterized in that consisting of a bolt separating step.

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