KR100380631B1 - An apparatus working screw thread of a tap - Google Patents

Abstract

The present invention relates to a thread processing apparatus of a tab for processing to form a relief on the thread of the tab used to make a female thread, and more particularly, the number of grooves of the chip discharge groove formed on the tab and the clearance angle of the thread (relief). By mounting a thread processing device on the lathe that can easily process the thread, the thread of the tap forming a relief that could not be machined on a general machine tool is widely spread and is easily and precisely processed on a lathe commonly used. This is to enable high quality tabs at low production costs.

To this end, one embodiment of the present invention, 1,2,3,4 stage gears (2,3,4,5) are installed in the main shaft shaft shaft (1) of the shelf, the main shaft in the center of the four-gear gear (5) A large center 6 is installed, and a bracket 9 having a long hole 8 is installed at one rear of the main shaft 7, and a table 11 is fixed at the rear of the central part of the bed 10. A guide rod 12 is horizontally installed between the lower end of the bracket 9 and the table 11, and the guide rod 12 has a long hole 13 formed therein and a height adjustment portion formed with a female threaded portion 14 at an upper portion thereof. A stand 15 is installed, and the long gear 13 of the height adjuster 15 has an idle gear selectively engaged with the respective 1,2,3,4 step gears (2,3,4,5). 16) is installed, the positioning screw 17 is inserted into the long hole (8) of the bracket (9), the idle gear 16 on one side between the upper surface of the table 11 and the bracket (9) And driven gears (18) interlocking with each other A driven shaft 20 provided with a cam 19 is installed on the upper surface side of the table 11, and a spring support 29 is provided on an upper portion of the carriage 21 having an operating space 28 formed on an upper portion of the bed 10. ) Is equipped with a double tool stand 22 is installed, a spring 30 is installed on the inside of the working space 28, and a thread polishing wheel 25 is installed on the top of the double tool stand 22 ( 26 is provided, and the contact roller 31 in contact with the cam 19 is provided by the bracket 32 at the rear end of the double tool rack 22.

In addition, this embodiment of the present invention, in the front-rear direction by the adjustment handle 27 in which a screw is installed in place of the thread polishing machine 26, the thread polishing wheel 25 is installed on the top of the double tooling tool 22. Horizontally movable and the tool stand 34 to which the bite 33 is mounted is detachably installed.

The rotational speed of the driven shaft 20 is variable according to the engagement position between the 1,2,3,4 step gear (2,3,4,5) and the driven gear 18 through the idle gear 16, According to the curve of the cam 19 of the driven shaft 20 which rotates at a predetermined speed, the double tool tool 22 reciprocates forward and backward, and thus, the screw polisher 26 installed in the double tool tool 22 reciprocating. The thread polishing wheel 25 or the bite 33 can grind the thread relief amount of the tab with a predetermined clearance angle rather than a circle.

Description

An apparatus working screw thread of a tap}

The present invention relates to a thread processing apparatus of a tab for processing to form a relief on the thread of the tab used to make a female thread, and more particularly, the number of grooves of the chip discharge groove formed on the tab and the clearance angle of the thread (relief). By mounting a thread processing device on the lathe that can easily process the thread, the thread of the tap forming a relief that could not be machined on a general machine tool is widely spread and is easily and precisely processed on a lathe commonly used. This is to enable high quality tabs at low production costs.

In general, taps are one of the most widely used hand tools for machining female threads. In the case of taps with small nominal dimensions, the taps are made in a round shape without the thread relief of the taps. In this case, a thread relief is placed.

As shown in FIG. 6, the thread relief of the tab forms a relief R of the thread so as to be eccentric with the screw center, and a chip between the lands L, in which the cutting of the thread part having a plurality of threads is made. Chip discharge groove (G) for discharge is formed.

In such a tab, the threaded portion can be cut on a lathe, and the chip ejection groove G formed in the longitudinal direction on the threaded portion of the tab can be machined in milling, but the threaded relief R is formed eccentrically with the screw center. ) Cannot be processed by lathe or mill, which is a general cutting machine, and has been cut by attaching a tab milling accessory to the universal milling machine or by using a tap machine.

However, in the case of the tap-only machine, although the price of the tap-only machine is very expensive, it is not economically problematic to process only the tap that needs to process the thread relief, which is not in demand because other machining is impossible. In the case of attaching the exclusive tab processing accessory to the universal milling machine, each time the tap is machined, the dedicated tab processing accessory is installed separately and the tap processing is completed. After that, there was a problem that the setting work for the original work of the milling machine had to be redone, and thus the workability and productivity were reduced.

The present invention is to solve the above problems, an object of the present invention is a thread processing apparatus of the tab to facilitate the processing of the thread relief is formed eccentrically in the center of the tab on a shelf that is generally widely used and inexpensive It is a technical task to make high quality tabs at low production cost by precisely forming thread relief on the first roughed tab or the first roughed and second heat treated tab. .

The present invention for achieving the above object, 1,2,3,4 stage gears that are smaller toward the tailstock side of the shelf is installed freely rotatable, the spindle center is installed in the center of the fourth stage gear, A bracket having a long hole in a horizontal direction is installed at one rear of the stand, a table is fixedly installed at the rear of the center of the bed, and a guide rod is horizontally installed between the lower end of the bracket and the table, and the guide rod is vertically disposed in the center. A long hole is formed and a height adjuster having a female thread on the upper part is installed to be movable in a horizontal direction. The long hole of the height adjuster is provided with an idle gear selectively engaged with each of the 1,2,3,4 gears. In the long hole of the bracket, the distal end is fastened to the female screw of the height adjusting unit so that the height adjusting unit can be moved horizontally from side to side. The crew is inserted and installed, and between the upper surface of the table and the bracket, a driven gear that engages with the idle gear is widely installed on one side, and a driven shaft with a cam is installed on the upper surface of the other table, and the left and right directions from the top of the bed In the upper part of the carriage, which moves horizontally and forms the operating space so that the upper part is opened, a double tool rest is installed on the rear bottom surface so that the spring bearing protrudes downward. A spring for elastically pushing the side is installed elastically, and the upper part of the double tooling tool is capable of horizontal movement in the front-rear direction by the adjusting handle incorporating a screw, and is equipped with a thread polishing wheel which is rotated by receiving the power of the motor as a belt. It is detachably installed and is attached to the rear end of the double tool bench. The contact roller which elastically contacts the cam is installed by the bracket

It is characterized by.

1 is a plan view of a shelf in which the present invention is installed.

Figure 2 is an enlarged plan view showing the main portion of the present invention.

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

Figure 4 is a perspective view showing a partial extraction of the installation state of the idle gear in the present invention.

5 is a plan view showing that the bite is mounted on the top of the double tool according to the present invention.

6 is a cross-sectional view showing the structure of the tab.

<Explanation of symbols for main parts of drawing>

1: Main shaft axis 2: 1 stage gear 3: 2 stage gear

4: 3 gears 5: 4 gears 6: Headstock center

7: headstock 8: long hole 9: bracket

10 bed 11: table 12: guide rod

13: long hole 14: female thread 15: height adjustment

16: idler gear 17: position shifting screw 18: driven gear

19: cam 20: driven shaft 21: carriage

22: double tooling platform 23: motor 24: belt

25: Thread polishing wheel 26: Thread polishing machine 27: Adjustment handle

28: working space 29: spring receiving 30: spring

31: contact roller 32: bracket 33: byte

34 tool bar

Hereinafter, a thread processing apparatus for a tab mounted to a shelf according to the present invention will be described with reference to FIGS. 1 to 4.

As shown in Figures 1 to 4, one embodiment of the thread processing apparatus of the tab according to the present invention is thread polishing on the thread of the hardened tab when the thread of the tab is hard by roughing first and heat treatment second. The wheel 25 is used to form a relief.

That is, in one embodiment of the present invention, 1,2,3,4 stage gears (2,3,4,5), which become smaller toward the tailstock side of the main shaft shaft shaft 1 of the lathe, are fixed integrally on the same shaft and rotate. It is installed freely, and the headstock center 6 is provided at the center of the fourth gear 5.

In addition, a bracket 9 having a long hole 8 in a horizontal direction is installed at one rear of the main shaft 7, and a table 11 is fixed at the rear of the central portion of the bed 10 and the bracket 9 is provided. The guide rod 12 is horizontally installed between the lower end of the table 11 and the guide rod 12 has a long hole 13 formed in the vertical direction in the center and a female threaded portion 14 formed on the upper side. The adjuster 15 is installed to allow horizontal movement in the left and right directions.

In the long hole 13 of the height adjuster 15, the idle gear 16 selectively engaged with each of the 1,2,3,4 gears 2,3,4,5 can be moved in the vertical direction. Installed in the bracket 9, the position shifting screw 17 which allows the front end portion of the bracket 9 to be fastened to the female threaded portion 14 of the height adjuster 15 so as to move the height adjuster 15 horizontally. ) Is inserted and fastened through.

In addition, between the upper surface of the table 11 and the bracket 9, the driven shaft 20 is rotatably installed by a support in which bearings are inserted on both sides, and the driven shaft 20 has an idle gear (one side). 16) is engaged with the driven gear (18), the inner width of the driven gear (18) of the 1,2,3,4 stage gear (2,3,4,5) It is formed as wide as it is combined and the cam 19 is provided in the upper surface side of the other table 11.

At this time, the number of teeth of the first gear (2) is six times more than the idle gear (16), the number of teeth of the second gear (3) is five times more than the driven gear (18), the number of teeth of the third gear (4) is Four times the driven gear 18 and the number of teeth of the four-gear gear (5) is formed three times more than the driven gear 18, 1,2,3,4 gears (2,3,4,5) and driven gear The number of revolutions of the driven shaft 20 can be varied depending on the number of stages (position) to which the 18 is connected via the idle gear 16.

And, the upper part of the bed 10 is provided with a carriage 21 to move horizontally in the horizontal direction along the guide rail of the bed 10, the carriage 21 is to open the operating space 28 so that the upper portion is opened. In the upper part of the carriage 21, a double tool stand 22 is installed on the rear bottom face so that the spring support 29 protrudes downward, and the front end of the operating space 28 is spring-loaded. The spring 30 which catches on the receiving body 29 and pushes the carriage 21 to the table 11 side is elastically provided.

In addition, the upper part of the double tooling tool 22 is capable of horizontal movement in the front and rear direction by the adjustment handle 27 in which a screw is installed, and rotates by receiving the power of the motor 23 as the belt 24 and rotating it. A thread grinder 26 provided with 25 is detachably installed, and a contact roller 31 elastically contacting the cam 19 is attached to the bracket 32 at the rear end of the double tooling tool 22. It is installed by.

Next, as another embodiment of the present invention, one embodiment shown in Figs. 1 to 3 is a first step of rough machining and the second heat treatment, if the thread of the tab is hard thread grinding wheel (25) 5 to form a relief, but another embodiment of the present invention shown in FIG. 5 is to form a relief by using a bite 33 in the thread of the tab when only roughing is primarily performed and is not relatively hard. All configurations are the same as in the embodiment, but only different point in the front and rear direction by the adjustment handle 27 in the screw instead of the thread grinder 26 in the upper part of the double tooling tool 22. Only the configuration in which the tool rest 34 to which the bite 33 is mounted is detachably installed is different.

Referring to Figures 1 to 6 the working relationship of the present invention configured as described above are as follows.

First, the tab T to be polished in the present invention is typically formed with three to six chip discharge grooves G for chip discharge in the longitudinal direction of the body of the tab, the land of the thread for cutting the female thread ( L) is not a circle in the center of the tab, and the radius of the tip of the blade tip (r1) is larger than the radius of the blade tip (r2) to form a thread relief (R). The blade tip distal end portion (b) is capable of smoothly tapping without contacting the machining surface.

The thread processing apparatus of the tab of the present invention processes the inclined thread relief (R) of the tab as described above, and the tab to be polished by the polishing apparatus of the present invention is roughly cut as a cutting machine in a predetermined dimension and shape. In the case of heat treatment of the semi-finished state tab of the second-processed semi-finished product to increase the strength and hardness, the inaccurate portion of the hardened portion by the heat treatment is precisely polished as the thread grinder 26, Although the thread relief may be formed as the bite 33 in the roughly roughed tab, the present invention will be described with reference to an embodiment in which the abrasive is polished as a thread polisher.

In the case of the embodiment shown in Figures 1 to 4, in order to grind the first and second processed tabs as described above, 1,2,3,4 gears according to the number of chip discharge grooves formed in the tabs. The rotational speed of the driven gear 18 meshed with the idle gear 16 should be adjusted by changing the engagement positions of (2, 3, 4, 5) and the idle gear 16, and the number of teeth of the first gear (2) The ratio of the number of teeth of the driven gear 18 is 1: 6, the ratio of the number of teeth of the second gear 3 and the number of teeth of the driven gear 18 is 1: 5, the number of teeth and the driven gear of the third gear 4. The ratio of the number of teeth of (18) is 1: 4, and the ratio of the number of teeth of the four-gear gear 5 and the number of teeth of the driven gear 18 is 1: 3, and then 1,2,3 meshed through the idle gear 16. The fourth gear (2, 3, 4, 5) and the driven position of the driven gear 18, the rotational speed of the driven gear 18 is faster or slower.

When the driven gear 18 is engaged with the first gear 2 and the driven gear 18 rotates quickly, the cam 19 provided on the driven gear 18 and the driven shaft 20 is also driven gear 18. In the case of the first gear 2 and the driven gear 18 is connected through the idle gear 16, the double tool 22 will be reciprocated quickly forward and backward by rapidly rotating at the same speed as will be described later. The double tooling tool 22 reciprocates six times while the tab chucked between the spindle center 6 and the center of the tailstock rotates six times to polish the thread of the tab that forms the six chip ejection grooves. If the fourth gear 5 and the driven gear 18 having the smallest number of teeth are connected through the idle gear 16, the speed of the driven gear 18 is equal to the number of teeth of the fourth gear 5; According to the ratio of the number of teeth of the driven gear 18, the double tooling tool 22 reciprocates three times while the tap is rotated once. For example, the thread of the tab having three chip discharge grooves is polished to form a thread relief.

As described above, when the gears of the 1,2,3,4 gears (2,3,4,5) and the driven gear 18 are adjusted, the bracket 9 is shown in FIGS. 2 and 4. Loosen the nuts holding the position shift screw 17 inserted through the long hole 8 of the slot 8 so that the position shift screw 17 can move back and forth in the long hole 8 so as to freely move. Loosen the nut that secures the central axis of the idle gear 16 installed in the long hole 13 of the idle hole 13, so that the idle gear 16 can be moved up and down.

Loosening the position moving screw 17 and the idle gear 16 as described above, it is possible to move the idle gear 16 in four directions, left and right, up and down to engage the gears to fit the chip discharge groove number of the tab to be processed. Fix the positioning screw 17 and the idle gear 16, respectively.

After adjusting the position of the gear in accordance with the chip discharge groove number of the tab to be processed in this way, the tap to be processed between the spindle center 6 and the center of the tailstock is chucked. In this case, the blade tip end of the tab is chucked so as to be positioned on the horizontal center line, and the cam 19 is set so that the farthest center distance is located on the indicator pin 19a of FIG.

In this state, when the main shaft shaft 1 is rotated, the 1,2,3,4 stage gears (2,3,4,5) installed on the main shaft shaft 1 rotate at the same time, and the idle gear 16 is mentioned above. As described above, the idle gear 16 meshes with a gear corresponding to the number of chip ejection grooves of the tab to be machined, and the idle gear 16 meshes with the driven gear 18 to rotate the driven shaft 20.

The driven gear 18 which rotates in engagement with the gear selected as described above is rotated at a predetermined speed according to the number of teeth of the selected gear, so that the cam 19 provided on the same axis as the driven gear 18 is also driven by the driven gear 18. It will rotate at the same rotation speed.

As shown in FIGS. 2 and 3, the cam 19 that rotates as described above is elastically provided with the contact roller 31 provided at the end of the double tool rack 22 and the double tool rack 22 by the spring 30. In accordance with the rotation of the cam 19, the double tooling tool 22 including the contact roller 31 and the thread polishing machine 26 provided above the double tooling tool 22 are also in accordance with the cam curve and the elastic restoring force of the spring. It will move back and forth.

In the case in which the double tooling tool 22 including the contact roller 31 and the thread grinder 26 installed above the double tooling tool 22 are pushed forward, the center distance of the cam curve is long, and the cam 19 When the center distance of the cam curve is shortened while rotating), the thread polishing machine 26 installed on the upper side of the double tooling tool 22 and the double tooling tool 22 including the contact roller 31 by the elastic restoring force of the spring 30. To return to the rear side, the double tooling tool 22 including the contact roller 31 and the thread polishing machine 26 installed above the double tooling tool 22 are reciprocated forward and backward.

As described above, the reciprocating motion of the double tooling tool 22 is driven by the driven gear 18 through the idle gear 16 while the tab chucked between the main shaft center 6 and the tailstock center is rotated once. In the case of the first gear 2, the double tooling tool 22 reciprocates six times according to the positions of the three and four gears (2, 3, 4, 5), and the two gears (3). There are five times, three times in the case of the three-stage gear (4), three times in the case of the fourth gear (5).

As described above, the positions of the 1,2,3,4 step gears (2,3,4,5) engaged with the double gear tool (22) through the driven gear (18) and the idle gear (16) while the tap is rotated once. According to six times, five times, four times and three times, the reciprocating movement is performed in six times, in which the tap has six chip discharge grooves. When the double tool tool 22 reciprocates once, the tap rotates by 60 °. In the case of reciprocating three times, the tap T is rotated by 120 ° when the double tooling tool 22 reciprocates once with three chip discharge grooves of the tab.

As described above, the double tooling platform 22 reciprocates three to six times by moving the curve of the cam 19 as mentioned above, and the reciprocating amount is reciprocated by the thread relief amount of the tab.

That is, when the center distance of the cam 19 is the longest part, the thread polishing machine 26 mounted on the dressing tool 22 including the double tooling tool 22 is pushed by the eccentric length of the cam 19 and the thread polishing machine The thread polishing wheel 25 of (26) contacts and polishes the tip end portion (a) of the tab, and when the cam 19 is rotated, the center distance of the cam 19 is gradually shortened to the shortest part. The polishing wheel 25 may be polished with the thread relief R of the tab while contacting the blade tip end portion b.

As described above, the thread polishing wheel 25 is rotated by receiving the power of the motor 23 through the belt 24 during the polishing process by putting the thread relief R of the tab along the cam curve of the cam 19 as described above. One is true.

In this embodiment of the present invention shown in Figure 5 is applied to the case of forming a thread relief as a bite on the thread of the tab roughly roughly processed, the thread grinding wheel 26 provided with a thread polishing wheel 25 of one embodiment Since the tool rest 34 on which the bite 33 is mounted is detachably installed instead of the above, forming the thread relief is the same as in one embodiment, but when forming the thread relief, the bite ( Since only 33) is different, a detailed description of the operation of this embodiment is omitted.

In the case where the thread grinder 26 is used and the bite 33 is to be used, the thread grinder 26 is separated from the upper part of the double tooling tool 22, and then the upper part of the double tooling tool 22 is used. Naturally, it is necessary to replace and install the tool stand 34 on which the bite 33 is mounted.

As described above, replacing the thread grinder 26 and the tool rest 34 on the upper part of the double tool rest 22 removes only the bolts first, and then removes the previously mounted tool and uses the bolt in place for the tool to be processed. Just install it and the replacement is very easy.

The thread processing apparatus of the tab according to the present invention as described above, the thread processing apparatus of the tab to automatically process the thread relief which is formed eccentrically at the center of the tab on the lathe which is generally widely used and cheaply used The thread relief can be easily and precisely processed on the threads of the first roughed tab or the first roughed tab and the second heat treated tab for increased strength, thus producing high quality taps at low production cost. It has the advantage that it can.

Claims (2)

1,2,3,4 stage gears (2,3,4,5) are rotatably installed in the main shaft shaft (1) of the lathe as the number of teeth decreases toward the tailstock side. Headstock center (6) is installed, A bracket 9 having a long hole 8 in a horizontal direction is installed at one rear of the main shaft 7, and a table 11 is fixed at the rear of the central part of the bed 10 and a lower end of the bracket 9. The guide rod 12 is horizontally installed between the table 11 and the guide rod 12. The guide rod 12 has a long hole 13 formed in a vertical direction at the center thereof and a female screw portion 14 formed thereon. 15 is installed to be movable in the horizontal direction, and in the long hole 13 of the height adjuster (15) selectively with each of the 1,2,3,4 step gear (2,3,4,5) An engaging idle gear 16 is installed, and the long end 8 of the bracket 9 is fastened to the female threaded portion 14 of the height adjuster 15 to horizontally move the height adjuster 15. To move the position screw 17 is installed, Longitudinal gear 18 is engaged between the upper surface of the table 11 and the bracket 9 on one side with the idle gear 16 and a cam 19 on the upper surface of the other table 11. Coaxial 20 is installed, Double tooling platform installed horizontally from the top of the bed 10 to the upper side of the carriage 21 is formed in the operating space 28 to open the upper side spring spring 29 is projected downward on the rear side (22) is seated and installed, the inner side of the working space 28, the front end is caught by the spring receiving 29, the spring 30 to push the carriage 21 to the table 11 side is elastically installed, The upper part of the double tooling tool 22 is capable of horizontal movement in the front-rear direction by the adjusting handle 27 having a screw therein, and is rotated by receiving the power of the motor 23 as the belt 24 and rotating it. Thread grinding machine (26) is installed detachably, The thread processing apparatus of the tab, characterized in that the contact roller 31 which is in elastic contact with the cam (19) is provided by the bracket (32) at the rear end of the double tool stand (22). (Correction) 1,2,3,4 gears (2,3,4,5) are installed on the spindle shaft (1) of the lathe so that the number of teeth decreases toward the tailstock side. ) Is located in the center of the headstock center (6), A bracket 9 having a long hole 8 in a horizontal direction is installed at one rear of the main shaft 7, and a table 11 is fixed at the rear of the central part of the bed 10 and a lower end of the bracket 9. The guide rod 12 is horizontally installed between the table 11 and the guide rod 12. The guide rod 12 has a long hole 13 formed in a vertical direction at the center thereof and a female screw portion 14 formed thereon. 15 is installed to be movable in the horizontal direction, and in the long hole 13 of the height adjuster (15) selectively with each of the 1,2,3,4 step gear (2,3,4,5) An engaging idle gear 16 is installed, and the long end 8 of the bracket 9 is fastened to the female threaded portion 14 of the height adjuster 15 to horizontally move the height adjuster 15. To move the position screw 17 is installed, Longitudinal gear 18 is engaged between the upper surface of the table 11 and the bracket 9 on one side with the idle gear 16 and a cam 19 on the upper surface of the other table 11. Coaxial 20 is installed, Double tooling platform installed horizontally from the top of the bed 10 to the upper side of the carriage 21 is formed in the operating space 28 to open the upper side spring spring 29 is projected downward on the rear side (22) is seated and installed, the inner side of the working space 28, the front end is caught by the spring receiving 29, the spring 30 to push the carriage 21 to the table 11 side is elastically installed, On the upper part of the double tool stand 22, a tool stand 34 capable of horizontal movement in the front-rear direction and a bite 33 mounted thereon is detachably installed by an adjustment handle 27 having a screw. The thread processing apparatus of the tab, characterized in that the contact roller 31 which is in elastic contact with the cam (19) is provided by the bracket (32) at the rear end of the double tool stand (22).