JPS6042060Y2 - Mandrel torque detection device for honing machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a torque detection device for a mandrel in a honing whirl, and particularly to a torque detection device suitable for honing a small diameter hole.

In conventional honing machines, when the grindstone expansion mechanism is mechanical (constant speed expansion), the grindstone pressure increases due to clogging, crushing, etc., and if the torque acting on the grindstone and mandrel exceeds a certain value, the grindstone may be crushed. This may lead to accidents such as damage to the mandrel.

If the grinding wheel expansion mechanism is hydraulic (constant pressure expansion), the grinding wheel will escape when the grinding wheel pressure increases and becomes higher than the expansion pressure, but if the hole becomes small in diameter, it will be difficult to adjust the pressure and this may result in the grinding wheel being crushed or the mandrel being damaged. Connect.

For the above reasons, honing small-diameter holes is extremely difficult. Conventionally, manual stroke-type honing machines have been used to perform the process, relying on the intuition of experts, and an automatic stroke-type honing machine for small-diameter holes has not been realized. It was extremely difficult.

This invention makes it possible to realize an automatic stroke type honing machine for honing small-diameter holes as described above. Specifically, when the torque acting on the grinding wheel and mandrel exceeds a certain value, this is detected and the honing machine is activated. To prevent grinding wheels and mandrels from being crushed or damaged by making it possible to perform honing processing in a so-called clean-up state without stopping expansion, and to extend the life of tools such as grinding wheels and mandrels, and to clean up the tools. If the torque acting on the grinding wheel and mandrel becomes lower than a certain value when honing is performed in this state, this is detected and the grinding wheel is expanded.The torque acting on the mandrel is constantly detected and the The purpose of this invention is to enable automatic stroke type honing in honing processing, and also to prevent damage to tools caused by operator inexperience in manual stroke type honing machines, and to facilitate the process. It is something.

To explain the embodiment, 1 is a main shaft driven by an electric motor (not shown), 2 is a mandrel, and a grindstone is attached to the tip (not shown) of the mandrel.

3 is a connecting culm for expanding the grindstone by a grindstone expansion mechanism (not shown).

4 is an adapter for mounting the mandrel, and the mandrel 2 is positioned and fixed using a hexagon socket set screw 5 and a positioning pin 6.

In the above, while the inner cylinder 8 and the disk 10 having several holes 9 formed on the same circumference are fixed on the main shaft 1 via the key 7, the inner cylinder 8 is rotatable via the bearing 11. A pin 14 protruding from the inner cylinder 8 is engaged with an arcuate groove 13 provided on the inner diameter of the outer cylinder 12, and a certain angle of the rotation direction of the outer cylinder 12 with respect to the inner cylinder 8 is provided. Displacement is allowed by the arcuate groove 13.

The outer cylinder 12 further includes a disk portion 15 facing the disk 10.
and several holes 16 corresponding to the holes 9 of the disk 10.
The holes 9 and 16 are arranged on the same axis with the pin 14 engaged with one end of the arcuate groove 13 as shown in FIG.

The outer cylinder 12 is connected to an adapter mounting cylinder 19 via a bearing holder 18 rotatably supported on the main shaft 1 via a bearing 17.
The adapter 4 is mounted and fixed to the mounting tube 19 using a cap nut 20 and a positioning pin 21.

An intermediate ring 23 having teeth 22 carved on its outer diameter is disposed between the inner cylinder 8 and the outer cylinder 12, and is inserted into a radial hole 24 in the outer cylinder 12 with a spring 25 in the radial direction. A click stop mechanism is constructed by making the steel ball 26, which is biased and held in the opposite direction, come into elastic contact with the tooth groove of the tooth portion 22 of the intermediate ring 23.
The outer cylinder 12 and the intermediate ring 23 are configured to be able to rotate integrally by the engagement between the steel balls 26 and the teeth 22.

The pin 14 is placed between the intermediate ring 23 and the inner cylinder 8.
A spring 27 is disposed to bias the outer cylinder 12 in the rotational direction so that the outer cylinder 12 engages one end of the arcuate groove 13 into which it engages.

In the case of the embodiment, the spring 27 is a spiral spring, and one end 27a of the spring 27 is connected to the inner cylinder 8, and the other end 27b is connected to the intermediate ring 23.

The outer cylinder 12 is further provided with an intermediate shaft 28, and the shaft 28 has a
An intermediate gear 29 that meshes with the teeth 22 of the intermediate ring 23 is pivotally supported, and the intermediate gear 29 is attached to an internal gear 31 provided on a torque adjustment sleeve 30 that is rotatably supported on the outer diameter of the outer cylinder 12.
mesh.

The torque adjustment sleeve 3p engages the tip of a screw 32 screwed into the sleeve 30 with a circumferential groove 33 provided on the outer periphery of the outer cylinder 12 to prevent the sleeve 30 from moving in the axial direction, and also prevents the sleeve 30 from moving in the axial direction. It is designed to be able to rotate around.

At a position where the hole 9 of the disk 10 and the hole 16 of the disk portion 15 of the outer cylinder 12 are opposed to each other, a light emitting element 36 (which may be a light bulb) is attached to a mounting plate 35 fixed to the body 34.

) and a light-receiving element 37 are arranged oppositely with the holes 9 and 16 separated, and with the holes 9 and 16 aligned on the same axis, the light-receiving element 37 receives the light from the light-emitting element 36. A photoelectric switch mechanism is provided.

This invention has the above-mentioned configuration, and when the torque acting on the mandrel is less than the initial setting value set by adjusting the biasing force of the spiral spring, the rotational force of the main shaft 1 is transferred via the key 7. The force is transmitted to the inner cylinder 8, and in turn is transmitted to the intermediate ring 23 via the spring 27.

The intermediate ring 23 and the outer cylinder 12 form a click stop using a spring 25 and a steel ball 26 and are engaged to rotate together. Therefore, as the outer cylinder 12 rotates together with the intermediate ring 23, the bearing holder 18 , the adapter 4 and the mandrel 2 are rotated via the adapter mounting tube 19.

That is, the main shaft 1 and the mandrel 2 rotate integrally with the main shaft 1 via the rotary key 7, a disk 10, and an outer cylinder 12.
Since the disk portion 15 rotates at a constant speed, the hole 9 of the disk 10
By setting the hole 16 of the disk portion 15 at corresponding positions, the photoelectric switch mechanism generates a pulse signal corresponding to the rotational speed of the spindle 1 and the mandrel 2.

Therefore, by controlling the grindstone expansion mechanism according to this pulse signal, the grindstone expansion operation can be performed in accordance with the progress of machining.

As the honing process progresses, the grinding wheel pressure increases due to clogging of the grinding wheel, etc., and when a torque exceeding the initial setting value of torque by the spiral spring 27 acts on the mandrel 2, the inner cylinder 8 and the intermediate ring 23 are connected by the spring 27, the rotation of the mandrel 2 lags behind the rotation of the main shaft 1, causing the spring 27 to deflect, and the pin 14 of the inner cylinder 8 moves inside the arcuate groove 13 of the outer cylinder 12 as shown in FIG. , the main shaft 1 and the mandrel 2 move counterclockwise, and a deviation in the rotational direction occurs between the main shaft 1 and the mandrel 2.

That is, a deviation in the rotational direction is generated between the hole 9 in the disk 10 and the hole 16 in the disk portion 15 of the outer cylinder 12, blocking the light from the light emitting element 36 and making the light receiving element 37 inoperable.

That is, since the pulse signal from the photoelectric switch mechanism disappears, this signal is used to stop the operation of the grindstone expansion mechanism.

By stopping the grinding wheel expansion mechanism, honing is performed in a clean-up state.

When the torque becomes smaller than the initial setting value, the restoring force of the spring 27 acts to connect the hole 9 of the disk 10 and the outer cylinder disk portion 15.
The photoelectric switch mechanism again generates a pulse signal corresponding to the spindle rotation speed, and this signal is used to control the grindstone expansion mechanism.

To adjust the initial setting value of torque, use torque adjustment sleeve 3.
This is done by rotating 0.

When the sleeve 30 is rotated while the rotation of the main shaft 1 is stopped, the intermediate ring 23 is rotated via the intermediate gear 29 that meshes with the internal gear 31.

The rotation of the intermediate ring 23 is performed in a click-stop manner against the biasing force of the springs 25 against the steel balls 26 that engage with the toothed portions 22 of the intermediate ring 23.

In this way, the initial setting value of the biasing force of the spring 27, that is, the torque, can be adjusted.

In the above embodiment, while the main shaft 1 and the mandrel 2 are rotating at a constant speed (the torque acting on the mandrel is less than the initial setting value), the holes 9 and 16 are overlapped at corresponding positions, and the photoelectric switch mechanism is activated. generates a pulse signal, and when the torque acting on the mandrel exceeds the initial setting value, the positions of holes 9 and 16 shift and the pulse signal of the photoelectric switch mechanism disappears. When the torque is below the set value, the positions of holes 9 and 16 are shifted in the circumferential direction and the photoelectric switch mechanism does not generate a pulse signal, and when the torque exceeds the initial set value, holes 9 and 16 are on the same axis. It goes without saying that the photoelectric switch mechanism may generate a pulse signal in accordance with this, and the grinding wheel expansion mechanism may be stopped by this signal.

In addition, the adapter 4 may be constructed so as to be directly screwed onto the adapter mounting cylinder 19 without using the adapter mounting nut 20, or the adapter 4 and the adapter mounting cylinder 19 may be screwed into the bearing holder 18 as one body. You may also do so.

In honing, if the torque acting on the mandrel exceeds the initial setting value due to clogging of the grinding wheel, this can be immediately detected and the operation of the grinding wheel expansion mechanism can be stopped. This prevents accidents such as crushing of the grinding wheel and damage to the mandrel, and greatly extends the life of the grinding wheel, mandrel, etc., and also greatly increases the accuracy of machining to perform processing with a constant torque. In particular, it is possible to easily realize an automatic stroke honing machine for small-diameter holes, which was previously difficult to realize, and it also prevents damage to tools caused by the operator in manual stroke honing machines. Honing processing can be easily carried out by preventing this.

In addition, this invention uses a photoelectric switch mechanism as the torque detection mechanism to detect deviation in the rotational direction from the spindle tomandrel, so the detection accuracy is extremely high.
Since it is a non-contact type, there are fewer failures of the detection mechanism, and it is possible to perform reliable torque detection, and it is also possible to control the grinding wheel expansion mechanism in accordance with the rotation speed of the spindle using pulse signals from the photoelectric switch mechanism. Honing can be performed under optimal conditions, and by interposing an intermediate ring between the inner cylinder and the outer cylinder, and rotating the ring with a torque adjustment sleeve supported by the outer cylinder, Since the initial setting torque is adjusted between the inner cylinder and the intermediate ring, it is extremely easy to adjust the initial setting torque, and the intermediate ring and the outer cylinder engage in a click-stop manner. By doing so, the torque adjustment can be sensed in stages during the torque adjustment, and the adjustment can be performed more easily.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the main part of the embodiment, FIG. 2 is a side view of the main part, and FIGS. 3 and 4 are cross-sectional side views of a part. 1...Main shaft, 2...Mandrel, 3.
...Grinding wheel expansion mechanism connection frame, 4...Adapter, 7...Key 8...Inner cylinder, 9
, 16... Hole, 10... Disc, 12...
...Outer cylinder, 13...Setting groove, 14...
...Pin, 15...Disc part, 19...
Adapter mounting tube, 22... Teeth, 23...
...Middle ring, 25...Spring, 26...
...Steel ball, 27...Spring, 29...
Intermediate gear, 30...Torque adjustment sleeve, 31
...Internal gear, 36...Light emitting element, 3
7... Light receiving element.

Claims (1)

[Claims for Utility Model Registration] 1. A relationship between an inner cylinder that rotates together with the main shaft and an outer cylinder that rotates together with the mandrel, which allows a certain degree of angular displacement in the direction of rotation between the inner cylinder and the outer cylinder. In addition to providing a coupling means, an intermediate ring is disposed between the inner cylinder and the outer cylinder, and an engaging means for engaging the outer cylinder and the intermediate ring in the rotational direction is provided, and the intermediate ring is rotatably supported on the outer cylinder. A mandrel is fitted in the torque adjusting member so that only the intermediate ring can be rotated against the engagement between the outer cylinder and the intermediate ring, and a mandrel is inserted between the intermediate ring and the inner cylinder through the outer cylinder. A spring that biases in one direction is activated, and the biasing force of the spring is adjusted by rotating the intermediate ring. Furthermore, between the outer cylinder and a member that rotates together with the main shaft, the position of the main shaft and the mandrel in the rotational direction is adjusted. A mandrel torque detection device for a honing machine that is equipped with a photoelectric switch mechanism to detect deviation. 2 The intermediate gear pivotally supported on the outer cylinder is simultaneously meshed with the internal gear formed on the torque adjustment member and the teeth formed on the outer diameter of the intermediate ring, and the intermediate ring is rotated by the torque adjustment member. The apparatus according to claim 1, wherein the locking means for engaging the outer cylinder and the intermediate ring in the rotational direction is a click stop mechanism. 3. The photoelectric switch mechanism includes a light-emitting element and a light-receiving element arranged to sandwich a disk that rotates together with the main shaft, and a disk portion provided on the outer tube corresponding to the disk, and The device according to claim 1) or 2), wherein the device and the disc portion are provided with means for blocking or passing light from the light emitting element by shifting the positions of both members in the rotational direction.