JPS5834719A - Tapping device - Google Patents

Abstract

PURPOSE:To prevent failure at the tip of a tap by performing the machining while giving the tool return revolutions intermittently using a rotational mechanism for the tool holder and a swing mechanism which provides a reciprocative rotation including a reverse rotation quicker than the revolutions produced by said rotational mechanism. CONSTITUTION:While the oil hydraulic motor 2 is in operation and motor M out of service, the coupling shaft 3 and motor casing 5 rotate round the axis X1 and the axes X2, X3 rotate accordingly, and a gear 9 rotates being pushed by a roller 8 to turn the tap T in forward or backward movement for the purpose of carrying out tapping. When only motor M is operated, by contrast, the coupling shaft 3 does not rotate, and the output shaft 5a and round-column link 7 rotate round the X3, X2, and accordingly the gear 9 makes reversals in the swinging motion being pushed by the roller 8 to allow the tap T to carry reversals in a certain specific motion in the direction fore and aft, where reverse rotation will cause a quick return motion. When the two motors are driven, a 180 deg. regular rotation is alternated by 90 deg. reverse rotation, where the tapping is carried out during regular rotation while splash is exhausted during reverse rotation, and failure at the tip of tap is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to preventing tap breakage in a tap device.

Conventionally, screw taps were often broken during work in the screw room, which reduced the efficiency of the work including the preceding and following processes as well as the processing tank f, and caused large economic losses. Such breakage accidents occur in various types of taps, and are most common when the diameter of the tap is small compared to the hardness of the 4IK workpiece or in release taps.

Various causes of the accident can be considered, but one of the major drawbacks is that the tap is continuously rotated during machining, so there is no escape of chips, and the generated heat may cause breakage of the tip of the tag.

In the present invention, for example, 18 taps are used for machining during one machining operation.
00 forward rotation R1* as @ ”I* edition, R・,
. . . (Fig. 1), the disadvantages of the prior art are overcome by providing a tag mounting W that performs intermittently returning gI transmission R, , R, , R@, R8, . . . at every 90° while This is to dispel the

Next, an embodiment of the present invention will be described based on the drawings. 1 is a tool rest that can reciprocate on a table, 2 is a hydraulic rotation motor that is fastened with a bolt (not shown) of the tool rest IK, and 2 m is a hydraulic rotation motor that The output shaft of the motor 2, 3 is a bearing 4 in the turret 1.
．． When the output shaft 2a, which is fitted into the socket 3ak of the connecting shaft 3, is locked with the key 3C by the tightening force of the set screw 3b, the connecting shaft 3 is supported by the output shaft 2a. All around @ line X1.

On the other hand, reference numeral 5 denotes a housing for housing electric motor M and reduction gear #G, and one end of the housing is covered with a cap 6.
Then, the flange 6a is screwed onto the motor housing 5 to seal it.

The cap 6 has through holes 6b and 6f, of which the through hole 6
The connecting shaft 3 inserted into the screw hole 6c.

By locking the key 6C with the tightening force of set screws 6d and 6d, the housing 5 rotates together with the connecting shaft 3 about the axis X1. In addition, the cylindrical link 7 is rotatably fitted into the through hole 6fK of the cap 6.
Furthermore, the output shaft 5a of the electric motor M is inserted into the through hole 7aK drilled in the center of the cylindrical link 7, and the key 7d is secured by the tightening force of the set screw 7c inserted into the screw hole 7bK. Link 7 is connected to shaft fil Xs along with output shaft 5m.
It rotates around it. The cylindrical link 7 has a notch 7e and an eccentric through hole 7f that communicates with the notch 7e.
It is rotatably provided at a position protruding from 15.

A gear 9 is pivotally supported on the connecting shaft 3 by a needle bearing 9b at a position between the tool rest 1 and the motor shaft 5, and the roller 8 mentioned at @ is engaged in a notch or groove 9a of the gear 9. The gear 9 also meshes with the gear 30 for increasing speed, and a male screw member 11 is provided to the gear 10 so as to be movable in the axial direction and transmit rotation through a structure such as a spline, and the male screw member 11 is fixed to the tool post 1. The female screw member 1iK is screwed together, so the gear 1
When the gear 0 rotates, the tap holder 12 to which the male screw member 11K is attached moves forward or backward in the axial direction while rotating at the same time as the gear 0.

Next, the operation of this device will be explained. First, hydraulic rotary basket - evening 2
Considering the case where K 41111 Xs and K 41111 Similarly, the X-hole rotates around the axis X1, and therefore the gear 9 is also rotated by being pushed by the roller 8.

In this case, as long as the oil supply to the armpit hydraulic rotary motor 2 is kept constant, the gear 9 rotates at a constant speed, and therefore the tap T moves forward or backward while rotating at a constant speed. We meet by doing something.

The relationship between the time and the rotation angle of the tap at this time is like the straight man in Figure 6 of the tuna. Conversely, if we consider the case where the electric motor M is rotationally driven and the hydraulic rotary motor 2 is not driven, the connection shaft 3
does not rotate, the position of the motor housing 5 and the axis X of the cylindrical link 7 do not change when the cap 6 is moved as shown in the figure 111E5, and the output shaft 5a and the cylindrical link 7 are sequentially moved along the axis X by the drive of the electric motor M. ! The gear 9 rotates around the axis , and the late K @ 11 Xs similarly rotates around the axis @ oscillate. In this case, as long as the output shaft 51 of the electric motor M is driven to rotate at a constant speed, the gear 9 repeats a constant rocking motion, and therefore the tap T also repeats forward and backward motion while making a constant rocking motion. Especially process products,
If you turn in the tapping direction in A, OK, and rotate in the opposite direction in the opening, C, and '2,
The oscillating motion is a kind of fast return motion, and in this case, the relationship between the time and the tarapuri rotation angle becomes a steady waveform with the wave crest shifted to the right as shown in B in FIG.

Therefore, the hydraulic rotary motor 2 and the electric motor M are both KWjA.
If rotational driving is used, the relationship between the time and the rotation angle of the tap is the same as the above-mentioned uniform rotational motion and the oscillating motion B of the standing wave.
Since K is the composite of
This is a motion that alternately repeats forward rotation and 90° reverse rotation.

In this way, tap processing is performed while rotating in the forward direction, and 41J11 is performed while rotating in the reverse direction! By missing I and K, breakage of the tap tip can be prevented.In addition, the angles of forward rotation and reverse rotation that should be repeated alternately in this way were explained as 180c' and 90° in the above embodiment,
Without being limited to this, it is possible to set or change an appropriate angle fILK according to the type, diameter, hardness of the workpiece, etc. of the tool, and k for changing the inner angle is: ■ Hydraulic rotary motor 2 Adjust the oil supply amount by adjusting the throttle valve 1llI11. Adjust the (rotation center X of the reroller 80 axis X).

What is necessary is to change the locking distance, or (1) change the distance from the rotation center X of the axis X.

In addition, the ratio of the advance of the tap T in the axial direction to the rotation angle is constant in the device shown in the second figure, but it can also be changed by changing the pitch of the screw and one thread. good.

The present invention has the above structure, and its effects can be summarized as follows.

■ Since tapping is performed while the tool is returned and rotated intermittently, chips are released during the return rotation, and the heat generation of the tool is suppressed to prevent the tip of the tap from breaking, thereby reducing the economic loss of the tool itself. It is possible to avoid all economic losses due to defective products machined after tool folding and before replacement, loss of effort and time required for tool replacement work, and the possibility of becoming a bottleneck for previous and subsequent machining.

(2) A large amount of chips do not intervene during the machining process, heat generation of the tool is suppressed, and machining accuracy is improved because the same machining is performed on 2B11fc before and after return rotation during one machining operation.

(It can be applied to various types of taps such as zero-thin diameter taps, taper taps, and release taps, and can also adjust the rotation angle, angular acceleration, or advance of forward rotation and reverse rotation.

■ Since the continuous rotational motion and the oscillating motion are combined, it is possible to perform screw mounting without return rotation as in the conventional method by applying only the continuous rotational motion by operating the motor switch according to the required 1Nk of machining. You can also do it.

(If the entire swinging mechanism is carried by the output system of the continuously rotating rotating mechanism, the combination of rotations by both mechanisms is simple and reliable, and the structure of the mechanism is also simple.

(2) If a hydraulic rotary motor and a room-side motor are used together as a drive source, sufficient and adjustable rotational driving force and swinging driving force can be obtained with a small WiK.

(2) If a quick return mechanism is used as the swinging mechanism, the maximum speed in forward and reverse rotation of the tap can be kept below a predetermined value, and the time required for machining can be shortened as much as possible.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a graph showing the rotation angle of rotation including intermittent reversal of the pressure applied to a tap, and FIG. 2 is a graph showing a rotation angle of a tap device according to an embodiment. FIG. 3 is a perspective view showing the motor housing cap used in the tap device shown in FIG. 2 in a longitudinally open state; FIG. FIG. 5 is an explanatory diagram showing the mutual relationship between the gear, the four-wheeler, the cylindrical link, and the motor housing cap during the oscillating motion of the gear, and FIG. 6 is the tap device shown in FIG. 2. It is a graph showing the relationship between the rotation angle of a tap and time obtained by. 1... Turret 2... Hydraulic rotation motor 2... Output shaft 3... Connection shaft 5... Motor housing 5... Output shaft 6... Cap 7... Cylindrical link 8... Roller 9... Gear 10... Gear M... Gear G... Reduction device T... Tool Figure 1 Time Figure 3 f Figure 4 77 /e

Claims (1)

[Claims] a rotation mechanism that provides continuous rotation to a rotation drive system of a tool holder; and a swing mechanism that provides reciprocating rotation, including rotation in the opposite direction, to the rotation drive system at a faster speed than the rotation speed of the rotation mechanism. What is claimed is: 1. A tapping device characterized in that the rotations of both mechanisms are combined to intermittently return and rotate the tool for machining.