JPS6036904B2 - belt grinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt grinding device that can perform forced cutting while preventing a workpiece from moving up and down during machining.

Various belt grinding devices have been developed in the past.

Among these devices, a device shown in a side view in FIG. 1 has been developed as a device similar to the present invention. That is, a pillar 2 is erected on the main body 1, and a rotating shaft 3 is rotatably mounted on the pillar 2. A first pulley 4 is attached to this rotating shaft 3, and the rotating shaft 3 is rotated by an electric motor 5 placed at a position opposite to the pillar 2.
A rotary drive belt 6 stretched around a pulley 4 is caused to run.
The cylindrical main body portion of the workpiece 7 is placed on this rotary drive belt 6, so that it can be rotated. Cylindrical end portions 7a and 7b, which protrude substantially coaxially from both ends of the main body portion of the workpiece 7, are placed on guide plates 8 and 8. On the other hand, at the bottom of the workpiece 7, a grinding belt 10 with abrasive grains fixed on the outside is stretched over the outer periphery of a pulley 9 attached to the main body 1, and the grinding surface of the grinding belt 9 and the workpiece 7 A cutting plate (not shown) installed at the bottom of the grinding belt 10 makes a cut in the workpiece, and the workpiece 7 is machined. However, in this processing device, since grinding is performed by bringing the grinding belt 10 into contact with the lower side of the workpiece 7, the workpiece 7 and the end portion 7a,
If there is an error in the coaxiality with 7b, or if there is an error in the roundness of the workpiece 7, the workpiece 7 will be pushed upwards, and the machining accuracy and coaxiality will not only be inconsistent, but also
This has the drawback that a large amount of force is applied to the rotary drive belt 6, which shortens the life of the rotary drive belt 6. The present invention was developed in order to eliminate the drawbacks of the conventional devices described above, and the shafts coaxially provided at both ends of a cylindrical workpiece can be freely rolled by means of guide grooves, and the workpiece can be moved during machining. It is an object of the present invention to provide a belt grinding device that can grind the outer circumferential surface of a workpiece with high accuracy and high efficiency while holding the belt so that it does not move. The invention will now be described with reference to detailed illustrated embodiments.

Fig. 2 is a front view of an embodiment according to the present invention, and Fig. 3 is a facing view.
-m cut sectional view.

In these figures, two rotating shafts 12, 1 are attached to the main body 11.
2 is attached, and an electric motor (not shown) is attached to one rotating shaft 12. A grinding belt 15, to which coarse grains are fixed by hook bonding or the like, is stretched over the outer periphery of a pair of pulleys 13, 14 attached to these rotating shafts 12, 12. In addition, one fu. - The inner side of the grinding belt 15 is held against the grip 16, and tension is applied to the grinding belt 15. On the main body 11 between the pulleys 13 and 14, on the inside of the grinding belt 15, a grinding belt 15 is provided.
A cutting alloy 17 that is inclined with respect to the direction of movement of the blade is fixed directly, and constitutes a grinding mechanism 18 together with three pulleys 13, 14, 16, a grinding belt 15, and an electric motor (not shown). are doing. On the other hand, in this embodiment, as the support mechanism 19, a first guide body 20 and a second guide body 21 are installed on the main body 11 on both sides of the grinding belt 15. and,
The first guide body 20 is fixed on the main body 11 on the right side in the direction of movement of the grinding belt 15.
A war calendar body 20b having an L-shaped cross section and a retaining body 2 having a U-shaped cross section forming a linear guide groove 20a parallel to the feeding direction.
It consists of 0c. The width of the guide groove 20a is approximately equal to the diameter of the shafts 22a, 22a coaxially protruding from both ends of the cylindrical workpiece 22 to be machined, and one shaft 22a of the inserted workpiece 22. is formed to have a width that is freely transferable, and when the shaft 22a of the workpiece 22 is inserted, the outer peripheral surface of the workpiece 22 comes into contact with the grinding belt 15, and the cutting alloy 1
The workpiece 22 is formed at a height such that it has a predetermined size when passing through the grinding belt 15 on the grinding belt 15. Also,
The layered body 20b is a columnar body whose longitudinal direction is parallel to the grinding belt 15, and has one axis 22a of the workpiece 22 on its upper surface.
Atsushi 0 can be freely transferred. Furthermore, the leveler 20c is a columnar body whose longitudinal direction is parallel to the grinding belt 15, and is configured to restrain the upward movement of one shaft 22a of the workpiece 22 by its upper protruding end and lower surface. - On the other hand, the second guide body 21 is fixed on the main body 11 on the left side when facing the running direction of the grinding belt 15 forming the guide groove 21a, and has a longitudinal direction parallel to the grinding belt 15 and a J-shaped cross section. A columnar war calendar body 21b, a columnar holding body that is detachably attached to the main body 11 so that the grinding belt 15 can be easily replaced, the longitudinal direction is parallel to the grinding belt 15, and the cross section is U-shaped.
1c. The guide groove 21a is
It is formed by the layered surface of the battle layer body 21b that removably supports the other shaft 22a of the workpiece 22, and the lower surface of the upper protruding end of the holding body 21c, and its width is equal to that of the first guide body. 20
Similarly to the guide groove 20a, the width is approximately equal to the diameter of the other shaft 22a of the workpiece 22, and the width is such that the other shaft 22a of the workpiece 22 can freely roll, and the distance from the top of the main body 11 is approximately the same as the diameter of the other shaft 22a of the workpiece 22. It is on the same level as the guide body 20 of No. 1. In addition, the holding body 21c
is adapted to restrain the overlay of the other shaft 22a of the workpiece 22 by the lower surface of its upper protruding end. In this way, the two grooves 22a, 22a of the workpiece 22 inserted into the guide groove 20a of the first guide body 20 and the guide groove 21a of the second guide body 21 are removed from the guide grooves during machining by the grinding mechanism 18. While rolling along the guide grooves 20a and 21a, the guide grooves 20a and 21a are held so as not to move in the vertical direction, that is, in the direction perpendicular to the direction of guidance by the guide grooves 20a and 21a. Further, a pillar 25 erected on the main body 11 is provided on the upper part of the workpiece 22.
An electric motor M is installed in the holder, and a workpiece rotation pulley 27 is provided at the tip of a rotating shaft 26 of the electric motor M. In addition to this pulley 27, this pulley 2
A pulley 28 on the driven side of the pulley 7 is also arranged in parallel with the main body 11. A rotary drive belt 29 having elasticity for rotating the workpiece 22 is wound between these pulleys 27 and 28 . In order to forcibly roll the workpiece 22, a rotating alloy 30 is disposed inside the rotational drive belt 29. However, electric motor M
, the pulleys 27, 28, the rotation drive belt 29, and the rotation alloy 30 constitute a rotation drive mechanism 31 that rolls the workpiece 22 along the guide grooves 20a, 21b. and,
On both sides of the grinding belt 15, inside the first guide body 2.0 and inside the second guide body 21, a pair of chains 32,
32 are provided. These chains 32, 32 are provided with U-shaped receivers 33 at regular intervals, on which both shafts 22a, 22a of the workpiece 22 are rotatably mounted. 32, 32 are stretched between the rotating shafts 12, 12 of the grinding mechanism 18 described above. These chains 32, 32 are configured to be driven independently of the grinding belt 15 in the grinding mechanism 18, and constitute a feed mechanism 34 that feeds the workpiece 22 at a speed slower than the speed of the grinding belt 15. are doing. Next, the operation of this embodiment will be described.

First, the pulley 16 that applies tension to the grinding belt 15 in the grinding mechanism 18 is moved downward, and tension is applied to the grinding belt 15 so that the grinding belt 15 comes into close contact with the outside of the cutting alloy 17.

Next, the rotational drive belt 29 is run in the direction of arrow A in FIG. 2, and the grinding belt 15 is run in the direction of arrow B in FIG.
In this state, the workpieces 22 are loaded one by one onto the U-shaped receivers 33 of the feed mechanism 34, the electric motor of the feed mechanism 37 is turned on, and the chains 32 are connected as shown in FIG. The belt is made to run in the direction of arrow C at a speed slower than the speed of the grinding belt 15. Then, both shafts 22a, 22a of the workpiece 22 are pressed by the rotational drive belt 29 of the upper rotational drive mechanism 31 and roll along the guide grooves 20a, 21a. Vertical movement in the direction perpendicular to is restricted. As a result, the grinding mechanism 18
After passing through the cutting alloy 17, the outer circumferential surface of the workpiece 22 is subjected to forced cutting grinding by the grinding belt 15, and is machined to a predetermined size having the required degree of sharpness and roundness. The workpiece 22 that has been machined is thus separated from the feed mechanism 34 and taken out from the left side of the support mechanism 19 in FIG. When the abrasive grains fixed to the surface of the grinding belt 15 are worn out and the grinding efficiency decreases, the grinding belt 15 is replaced. First, all electric motors are switched off, and the pulley 16 that applies tension to the grinding belt 15 of the grinding mechanism 18 is moved upward to make the grinding belt 15 ready for attachment and detachment. Next, the holding body 21c of the second guide body 21 is removed, and the used grinding belt 15 is replaced with the grinding belt 15 before use. After replacing the grinding belt 15, the main body 1
A holding body 21c is attached to the grinding belt 15, and the pulley 16 that applies tension to the grinding belt 16 is moved downward.
Apply tension to complete the grinding belt replacement work. As described above, the present invention installs the workpiece between the rotation drive mechanism that rotates the workpiece and the grinding mechanism that moves the grinding belt at high speed, and restrains the vertical movement of the workpiece during machining. At the same time, a support mechanism was provided in which a guide groove was formed to guide the workpiece in a freely removable manner to perform forced cutting, and the workpiece was configured to be fed at a constant speed by the feed mechanism, so that the workpiece could be protruded from both ends. Grinding of the outer peripheral surface of a workpiece can be performed with high precision and efficiency using the same axis as the processing reference. In particular, without reducing machining efficiency, the coaxiality and roundness of the shaft and workpiece do not restrict the vertical movement of the workpiece.
It has a special effect of significantly improving the performance. In addition, the wear of the abrasive grains formed on the grinding belt of the grinding mechanism is reduced, and the pressure caused by the vertical movement of the workpiece on the rotating belt of the rotary drive mechanism is also reduced, which has the effect of extending the life of the belt. play.

[Brief explanation of the drawing]

Fig. 1 is a side view of a subordinate belt grinding device, Fig. 2 is a front view showing the configuration of a belt grinding device according to an embodiment of the present invention, and Fig. 3 is a cross-sectional view taken along the line mm in Fig. 2. be. 15: Grinding belt, 18: Grinding mechanism, 19: Support mechanism,
20a, 21a: guide groove, 22: workpiece, 22a: shaft,
29: Rotation drive belt, 31: Rotation drive mechanism, 33:
Receiving part, 34: Feeding mechanism. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a belt grinding device that grinds the outer peripheral surface of a cylindrical workpiece having a cylindrical shaft protruding from both ends coaxially with the shaft, the shaft is guided and supported so as to be able to roll freely, and is The workpiece is placed in the guide groove, and includes a support mechanism in which a guide groove is formed to restrain movement in the vertical direction, and a plurality of receivers arranged at regular intervals to rotatably hold the shaft. The grinding belt has a grinding belt with abrasive grains fixed to the surface thereof, and the grinding belt is brought into contact with the workpiece supported by the guide groove and is caused to run along the guide groove to grind the workpiece. It has a grinding mechanism that grinds the outer peripheral surface of the object, and a rotational drive belt that contacts the workpiece supported in the guide groove from the side opposite to the grinding belt. A belt grinding device comprising: a rotational drive mechanism for forcibly rolling the workpiece by traveling along the belt.