KR20010000807A - A working apparatus of thread relief of a tap - Google Patents

Abstract

PURPOSE: An apparatus for working a screw thread relief of tap is adapted to be mounted to a lathe to work a thread relief of a tap. The apparatus is provided to simplify its structure, so that manufacturing cost is reduced. CONSTITUTION: In an apparatus for working thread relief of tap, a drive gear is mounted to a spindle of a lathe while a spindle center is mounted on the central section of the drive gear. A table(5) is fixed and mounted to the central rear side of a bed(4). A driven shaft of which one side is provided with a driven gear is horizontally mounted on the upper side of the table(5) by a support frame. The driven shaft is provided with a cam(9) which is capable of being changed by a fastening nut. An idle gear shaft provided with an idle gear mutually engaged between the drive gear and the driven gear is mounted between the table(5) and a spindle body. A duplex slide rest(17) including a spring bearing(16) provided on its lower rear side to protrude downwardly is set on a carriage horizontally moving leftward and rightward on the bed(4), in which operation space(14) is formed to allow its upper portion to be opened. A spring(18) for biasing the duplex slide rest(17) toward the table(5) as its front end is caught on the spring bearing(16) is elastically mounted in the operation space(14). A contact roller(24) elastically contacting with the cam(9) is mounted on a rear end of the duplex slide rest(17) by a bracket(25). A thread polishing machine(23) which horizontally moves leftward and rightward by an adjusting handle(19) incorporating a screw therein and is provided with a thread polishing wheel(22) rotated by a motor(20) through a belt(21) is detachably mounted on the upper portion of the duplex slide rest(17).

Description

Thread relief equipment for taps {A working apparatus of thread relief of a tap}

The present invention relates to a thread relief apparatus for taps mounted on a lathe to process thread reliefs of a tap, and more particularly, the cam is rotated by receiving power from the headstock of the lathe, and the cam is rotated. The relief machine for processing thread relief (hereinafter referred to as relief) of the tap is reciprocated according to the cam's curve, and the number of grooves and relief of the chip discharge groove of the tab are processed according to the pitch and the depth of the cam curve. By allowing the cam to immediately receive the rotation of the power of the spindle, and by changing the number of grooves and the relief of the chip discharge groove of the tab to replace the cam with a different pitch and valley depth of the cam curve, This is to simplify the structure of the thread relief processing device of the tab to reduce the manufacturing cost.

The applicant of the present invention has filed a patent application on September 29, 2000 regarding the "thread processing apparatus for taps" for processing a relief of a tap.

"Tab Thread Processing Apparatus" (patent application No. 2000-57313), filed by the applicant of the present application, is installed on a lathe, which is a kind of cutting machine. , 3, 4 gears are installed, and the double-sided tool which moves horizontally on the bed is equipped with a double-tool tool that has a spring inside and reciprocates back and forth, and a driven shaft with a cam and a driven gear on the rear side of the bed. A separate table is supported, and idle gears for selectively connecting 1,2,3,4 gears and driven gears are installed between driven gears and 1,2,3,4 gears. It is configured to selectively replace thread grinder and bite with abrasive wheel installed.

In such an application, the "thread thread processing device" of the tap is that the rotational force of the main shaft axle rotates the driven shaft through 1,2,3,4 gears, idle gears, and driven gear, and the cam installed on the driven shaft pushes the double tool stand. And the double tool bench pushed by the cam curve returns to the elasticity of the spring installed inside the double tool bench.

Thus, the movement width of the double tool tool reciprocating by the cam and the spring is minute, and a relief (R) is formed on the thread of the tab by the reciprocating movement distance, and the double tool is pushed by the cam curve. If the tool post is pushed away, the distance between the bite or polishing wheel and the machining surface of the tap is farther away, and when the double tool stand returns to its original position by a spring, the distance between the bite or polishing wheel and the machining surface of the tap is shortened. As shown in FIG. 6, the relief R is eccentrically formed.

The number of chip discharge grooves G formed in the tab T is a case in which the chip discharge grooves are three when the double tooling tool reciprocates three times when the tab chucked between the center of the main shaft and the center of the tailstock rotates. In the case of four round trips, four chip ejection grooves are processed. The number of round trips of the double tooling tool is determined in proportion to the number of teeth of 1,2,3,4 gears and driven gears having different teeth.

In the "applicable thread processing apparatus" of the present applicant, the means for selecting the number of reciprocating times of the double tool stage is determined according to the position where the 1,2,3,4 step gear and the driven gear are engaged through the idle gear. Since the idle gears must be constructed in such a way that the gears can be connected to the desired positions of the 1,2,3,4 gears while changing the position according to the number of chip ejection grooves, the structure becomes complicated and accordingly the manufacturing cost Had the problem of rising.

The present invention is to solve the above problems, the drive gear and the driven gear in the ratio of 1 to 1 on the main shaft axis and the driven shaft, respectively, and between the drive gear and the driven gear, the idle gear is installed between the tab and The driven shaft is rotated at the same speed. In the rotating driven shaft, the floor and valley are formed on the cam with the same number as the chip discharge groove of the tab to be machined, and then the number of chip discharge grooves of the tab to be machined. By allowing the cam to be replaced accordingly, the number of round trips of the double tooling tool is determined according to the number of floors and valleys formed in the cam, which simplifies the structure of the thread relief processing device of the tab, thereby reducing the manufacturing cost. It is technical task to make one.

The present invention for achieving the above object, the drive gear is installed on the main shaft axis of the shelf, the main shaft center is installed in the center of the drive gear, the table is fixed to the rear of the central portion of the bed, the upper surface of the table In the driven shaft is installed horizontally by a support, the driven shaft is installed on one side, the cam is replaceable by the fixing nut, between the drive gear and the driven gear between the table and the main shaft body. An idle gear shaft with interlocking idle gears is installed, and a double space is provided in the carriage provided in the upper part of the bed to form a working space so that the upper part is opened. A tool rest is settled and the inner end of the working space is caught by a spring support to bring the double tool rest to the table side. A spring for reeling out is elastically installed, and a contact roller elastically in contact with the cam is installed at a rear side end of the double tooling tool by a bracket, and a front and rearward direction by an adjustment handle in which a screw is installed on the upper part of the double tooling tool. It is horizontally movable, and the thread polishing machine is installed with a thread polishing wheel which rotates by receiving the power of the motor as a belt, and a tool post equipped with a bite is installed to be replaceable.

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

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

3 is a cross-sectional view taken along the line B-B in FIG.

Figure 4 (a) to (d) is an exemplary view showing various embodiments of the cam to be replaced 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: spindle shaft 2: drive gear 3: spindle shaft center

4: bed 5: table 6: driven gear

7 driven shaft 8 support 9 cam

10: fixing nut 11: headstock body 12: children gear

13: idle gear shaft 14: operating space 15: shuttle

16: spring receiving 17: double tooling 18: spring

19: adjusting handle 20: motor 21: belt

22: thread polishing wheel 23: thread polishing machine 24: contact roller

25 Bracket 26 Bite 27 Tool Stand

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 5.

As shown in FIGS. 1 to 5, in the thread relief processing apparatus of the tab according to the present invention, a drive gear 2 is provided on a spindle axis 1 of a lathe, and a spindle head is provided at the center of the drive gear 2. The center 3 is provided, and the table 5 is fixedly installed behind the center of the bed 4.

In addition, a driven shaft 7 provided with a driven gear 6 on one side is horizontally installed by the support 8 on the upper surface of the table 5, and a cam 9 is fixed to the driven shaft 7. 10) can be replaced.

An idle gear shaft 13 is installed between the table 5 and the main shaft body 11 with the idle gears 12 engaged with each other between the drive gear 2 and the driven gear 6. At this time, the number of teeth of the drive gear 2 and the driven gear 6 and the size of the pitch circle are the same, so that the rotational speed of the main shaft axis and the rotational speed of the driven shaft 7 should be the same.

As shown in FIGS. 1 and 3, the operating space 14 is formed in the carriage 15 provided at the upper part of the bed 4 so that the upper part is opened. A double tool stand 17 is installed with the spring support 16 protruded downward, and the front end of the operating space 14 is caught by the spring support 16 to rest the double tool stand 17 on the table 5. The spring 18 which pushes to the side is elastically provided.

At the rear end portion of the double tool stand 17, a bracket 25 provided with a contact roller 24 which is in elastic contact with the cam 9 is provided.

The upper part of the double tool 17 is provided with a relief processing device for forming a relief (R) on the thread of the tab (T) chucked between the center of the main shaft center 3 and the tailstock 28, This relief work factory selectively replaces the thread grinder 23 in which the thread grinding wheel 22 as shown in Figs. 1 and 3 is installed, and the tool post 27 on which the bite 26 shown in Fig. 5 is mounted. It is possible to install.

When the thread grinder 23 is installed, the thread grinder 23 is used to process a tab having a hard surface, and the thread grinder 23 has a horizontal movement in the front and rear directions by an adjustment handle 19 having a screw. A motor 20 is installed on the upper part of the body, and a thread polishing wheel 22 is provided at the front of the motor 20 to receive the power of the motor as the belt 21 and to rotate the thread of the tap while rotating. have.

In addition, the tool post 27 equipped with the bite 26 is used to process the first rough-cut tab without heat treatment, and the tool post 27 is an adjustment handle 19 incorporating a screw. The bite 26 for cutting the thread of the tab is attached to the body which can be horizontally moved in the front-rear direction by means of).

And, as shown in (a) to (d) of FIG. 4, the cam 9 shows six floors 9a and valleys 9b, five, four, and three. This is used to form a relief in the case of six chip discharge grooves formed on the outer periphery of the tab in the case of six floors 9a and valleys 9b, and the floors 9a and valleys 9b. 5 is used to form a relief in the case of five chip discharge grooves formed on the outer periphery of the tab, and 6 chip discharge grooves of the tab when the floor portion 9a and the valley portion 9b are four. In this case, it is used to form a relief, and in the case of three ridges 9a and valleys 9b, it is used to form relief in the case of three chip discharge grooves of the tab.

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

First, in the present invention, the tab T to be polished has three to six chip discharge grooves G for chip discharge in the longitudinal direction of the body of the tab, as shown in FIG. The land L of the thread to be processed is not a circle at the center of the tab, but the radius r1 of the blade tip is formed to be larger than the radius r2 of the blade tip, so that the female threaded hole is machined when the female thread hole is machined. Cutting is made and the blade end end portion (b) is not in contact with the machining surface is to be able to tap smoothly.

The thread processing apparatus of the tab of the present invention is to process the inclined relief (R) of the tab as described above, and the tab is roughly processed as a cutting machine in a predetermined size and shape, and the semi-finished product state is processed secondarily. In the case where the tabs are heat-treated to increase the strength and hardness, the inaccurate parts of the parts hardened by the heat treatment are precisely polished with the thread grinder 23, and the reliefs are applied to the first roughly processed tabs. 26), which will be described from the case of grinding by a thread polishing machine.

As shown in FIGS. 1 to 4, the first and second processed tabs are polished according to the number of chip discharge grooves formed in the tabs. The same cam 9 is installed using the fixing nut 10.

Then, when the main shaft shaft 1 is rotated, the rotational force of the main shaft shaft 1 rotates the driven shaft 6 through the driving gear 2, the idle gear 12, and the driven gear 6. Since the drive gear 2 for rotating and the driven gear 6 for rotating the cam 9 form the same number of teeth and the same pitch source, the tab and the cam 9 rotate at the same rotational speed.

As shown in FIGS. 1 and 3, the cam 9 that rotates as described above is elastically provided with the contact roller 24 provided at the end of the double tool stand 17 and the double tool stand 17 by a spring 18. As the cam 9 rotates, the double tool 17 including the contact roller 24 and the thread grinder 23 provided above the double tool 17 also depend on the cam curve and the elastic restoring force of the spring. It will move back and forth.

In the case where the double tool 17 including the contact roller 24 and the thread grinder 23 installed on the upper side of the double tool 17 are pushed forward, the floor 9a having a long center distance of the cam curve is provided. When the contact roller 24 is pushed, and the cam 9 rotates and the center distance of the cam curve is shortened (when the bone portion 9b comes into contact with the contact roller 24), it is caused by the elastic restoring force of the spring 18. The double tool holder 17 including the contact roller 24 and the thread grinder 23 installed on the upper side of the double tool holder 17 are returned to the rear side, and the double tool holder 17 including the contact roller 24 and the double type. The thread grinder 23 provided on the upper side of the tool post 17 is reciprocated forward and backward.

As described above, the reciprocating motion of the double tool stand 17 causes the cam 9 to rotate one turn while the tab chucked between the spindle center 3 and the center of the tailstock is rotated one time, and the floor portion 9a and the valley part. The thread polishing machine 23, including the double tooling tool 17, is reciprocated by the number of (9b).

That is, when the number of the floor portion 9a and the valley portion 9b is six, the cam 9 and the tab are reciprocated six times during one rotation, and the number of the floor portion 9a and the valley portion 9b is In the case of three, the cam 9 and the tab are reciprocated three times during one rotation.

If the double tool 17 reciprocates six times while the tab rotates once, the double tool 17 rotates by 60 ° when the double tool 17 reciprocates once, and the double tool stand rotates while the tab rotates once. When (17) reciprocates three times, the tab T will rotate by 120 degrees.

When the flooring tool 9a pushes the contact roller 24 while the double tooling tool 17 reciprocates 3 to 6 times according to the number of the floor 9a and the valley 9b of the cam 9 as described above. Since the thread polishing machine 23 mounted on the double tooling tool 17, including the double tooling tool 17, is pushed out, the threaded grinding wheel 22 has a contact distance between the machining surface of the tab and the threaded polishing wheel 22. As shown in FIG. 6, the tab tip and the thread grinding wheel 22 contact with the contact roller 24 when the cam 9 rotates and the valley 9b of the cam 9 contacts with the contact roller 24 while contacting the blade tip end portion a of the tab. As the spacing of the nearer becomes deeper the processing depth is to make the relief (R) on the tab by grinding the blade end end (b) of the tab.

Note that the relief R is formed by the depth of the cam 9, and as described above, the abrasive grinding wheel 22 is a motor when grinding the relief R of the tab along the cam curve of the cam 9. It is apparent that the power of 20 is transmitted through the belt 21 to rotate.

In the case of the bite shown in FIG. 5, it is applied to the case of forming a relief as a bite on the thread of the tab roughly roughly processed, and instead of the thread grinder 23 provided with the thread polishing wheel 22, the bite 26 Since the tool post 27 to be mounted is detachably installed, a detailed description thereof will be omitted.

In the case where the thread grinder 23 is used and the bite 26 is to be used, the thread grinder 23 is separated from the upper part of the double tooling tool 17, and then the upper part of the double tooling tool 17 is used. Naturally, it is necessary to replace and install the tool post 27 on which the bite 26 is mounted.

As described above, the task of replacing the thread grinder 23 and the tool rest 27 on the upper part of the double tool rest 17 is to unscrew the bolt and remove the first tool, and then use the bolt in place for the tool to be processed. Just install it and the replacement is very easy.

As described above, according to the present invention, a thread relief apparatus for taps is provided with a drive gear and a driven gear at a ratio of one to one on the main shaft axis and the driven shaft, respectively, and an idle gear is installed between these drive gears and the driven gear. The driven shaft and the tab are rotated at the same speed.In the rotating driven shaft, the floor and the valley are formed on the cam with the same number as the chip discharge groove of the tab to be processed, and then the chip discharge groove of the tab to be processed. By allowing the cam to be replaced according to the number of, the number of round trips of the double tooling tool is determined according to the number of floors and valleys formed on the cam, which simplifies the structure of the thread relief processing device of the tab, thereby reducing the manufacturing cost. There is an effect that can be reduced.

Claims (2)

The drive gear 2 is installed in the main shaft axle 1 of the lathe, the center of the drive gear 2 is a main shaft center 3 is installed, the table 5 is fixed behind the center of the bed (4) The upper surface of the table (5) is provided with a driven shaft (7) having a driven gear (6) on one side is horizontally installed by the support (8), the cam (9) is fixed to the driven shaft (7) Replaceable by (10), An idle gear shaft 13 is installed between the table 5 and the main shaft body 11 and the idle gears 12 engaged with each other between the drive gear 2 and the driven gear 6 are provided. A double tool installed horizontally from the upper part of the bed 4 to the upper side of the carriage 15 which forms the operating space 14 so that the upper part is opened so that the spring receiving part 16 protrudes downward from the rear side of the bed 4. A stand 17 is installed and a spring 18 is elastically installed at the inner side of the working space 14 so that the front end portion is caught by the spring receiver 16 to push the double tool 17 toward the table 5. , At the rear end of the double tool stand 17, a contact roller 24 which is in elastic contact with the cam 9 is provided by the bracket 25. The upper part of the double tool 17 is capable of horizontal movement in the front-rear direction by the adjusting handle 19 incorporating a screw, and rotates by receiving the power of the motor 20 as the belt 21 and rotating the thread polishing wheel 22. Thread relief machine of the tab, characterized in that the thread grinding machine 23 is installed detachably. The method according to claim 1, wherein in place of the thread polishing machine (23) having the thread polishing wheel (22) installed on the upper side of the double tooling tool (17), horizontally movable in the front-rear direction by the adjusting handle (19) incorporating a screw. Thread relief device of the tab, characterized in that the tool stand 27 is mounted detachably.