JPS60259364A - Double-end surface grinding machine - Google Patents

Abstract

PURPOSE:To improve the grinding efficiency and the yield of final product while to achieve full-automation by functioning an extendable stripe discharging device upon detection of final product through detector and pushing out the final product with constant speed. CONSTITUTION:Upon start of grinding machine, a pusher cylinder 14 will push out the work W one by one to the shooter 13 then the work W is carried on a belt system 12 into the grinding machine to be grinded at the opposite faces by means of grinding wheels 1. The grinded work W is pushed out to the discharging side by the following work W while the cylinder 14 will push the final produce W' into the shooter 13 and upon counting through a counter, a switch mechanism will contract the cylinder for lifting/lowering the bottom plate and upon lowering of the bottom plate into horizontal state, a limit switch will turn on to start rotation of motor 62 thus to rotate a drum 54, and a feed roller 56 with constant speed and to project the tip section of belt between both grinding wheels 1 to discharge the final work W' with constant speed resulting in full- automation.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention comprises two rotating grindstones that face each other at a distance, and a feed device that sequentially and continuously feeds a plurality of workpieces between the two grindstones. The present invention relates to a double-head surface grinding machine that sequentially and continuously grinds a certain number of workpieces.

- (Prior art) In this type of double-head surface grinder, especially a through-field grinding machine in which the workpiece is continuously and linearly passed between the grinding wheels, the workpiece that is fed between the grinding wheels and ground is ,
It is pushed out by the workpiece supplied later and is discharged to the discharge side. However, since the final workpiece will not be supplied later, it cannot be automatically discharged and will stop inside the whetstone pavilion. Conventionally, the final workpiece that stops inside the grindstone cabinet as described above is manually discharged, for example, by a worker inserting a long push plate between the grindstones from the workpiece supply side.

However, when the final processed product is manually discharged, not only a discharge worker is required, but also the discharge operation is time-consuming and inefficient. In addition, the speed at which the final workpiece passes between both grinding wheels, that is, the grinding feed rate, is no longer constant,
For example, since the final workpiece remains between the two grindstones for a long time, there is a very high probability that the final workpiece will be defective, which is uneconomical.

(Objective of the Invention) The present invention aims to improve the efficiency of grinding work in a double-head surface grinder by automatically passing the final workpiece between both grinding wheels at a constant speed and discharging it.
The aim is to improve the yield of final workpieces and enable complete automation.

(Structure of the Invention) G) A final workpiece detection device for detecting the supply of a final corner knee workpiece; (B) A machine that extends from the workpiece supply side at a constant speed between both grinding wheels to the workpiece discharge side. A final workpiece discharge device having a conventional belt-shaped workpiece discharge member is provided, and when the detection device detects the final workpiece, the discharge device is activated to push and discharge the final workpiece at a constant speed. There is.

(!li! Example) In FIG. 1 showing a plan view of a double-headed surface grinder to which the present invention is applied, a pair of disc-shaped rotary grindstones 1 are arranged to face each other with a gap between them, and Each is fixed to the grindstone holder 2. Each grindstone holder 2 is fixed to a rotating shaft 3, respectively. Both rotating shafts 3 are arranged horizontally and aligned with the same axis. Each rotation axis 3
are each rotatably supported by a slide grill (not shown) in the grinding wheel head 5, and are connected to a belt transmission mechanism 6.
It is interlocked and connected to the main motor 7 via. The belt transmission mechanism 6 and the rotating shaft 3 are interlocked and connected by Nupline fitting. That is, both magnets 1 rotate around the same horizontal axis at, for example, the same rotational speed due to the rotation of both motors 7. Each of the slide grills is supported by a grinding wheel 5 so as to be movable and adjustable in the direction of the rotation axis, and the head cutting hand/I/lo
Alternatively, the movement can be adjusted by a feed screw (not shown) that is rotated by operation of the head cutting motor 11 or the like.

As a workpiece feeding device, a belt feeding device 12, a shooter 13, and a shear cylinder 14 are arranged in this order from the grindstone 1 side. The belt feeding device 12 includes two sets of a driving pulley 15 and a driven pulley 16. Each pulley set 15, 16 is arranged on both sides of the workpiece path, and a V-belt 17 is wound around each of the pulley sets 15, 16. Both side movable pulleys 15 are configured to rotate in opposite directions, and rotate in the directions of arrows F and F', respectively, during grinding work, for example.

In Figure 2, a pair of goo! A plurality of V-belts 17 are wound around j15 and j16. Either one of the drive pulleys 15 is operatively connected to a feed drive motor 22 via, for example, a drive shaft 19, a gear 20, a worm 21, etc.
The remaining drive motor 15 is operatively connected to the feed drive motor t2 via, for example, a reversing mechanism. Further, a transmission device (not shown) is interposed between the drive motor 22 and the drive pulley 15, so that the rotational speed of the drive pulley 15 can be adjusted.

The shooter 13 includes a pair of vertical side plates 23 arranged on both sides of the workpiece passage and a bottom plate 24, and is inclined so that the end on the workpiece feed direction A side is lower than the other end. are doing. The end of the bottom plate 24 in the direction A is rotatably supported by a bracket 26 via a horizontal hinge pin 25, and the middle part of the bottom plate 24 is pivotally connected to a rod 28a of a cylinder 28 for lifting and lowering the bottom plate. The cylinder 28 is pivotally connected to a bracket 26 via a horizontal support pin 30, and the bracket 26 is fixed to the support base 8.

The pusher cylinder 14 is supported by a stopper frame 37 via a bracket 31, and the cylinder 14
A gutsher grate 33 is integrally provided on the rod 14a. 1. The shear plate 33 is indicated by the arrow A.
The side edges are formed into a partially arcuate shape. The one shear plate 33 is disposed in the same vertical plane as the workpiece path formed between the two shooter side plates 23, and one
A pair of guide rods 34 are integrally provided. The guide rod 34 is arranged parallel to the shooter 13, and
It is slidably supported by the guide tube 35. The guide tube 35 is fixed to the bracket 31.

In FIG. 3, reference numeral 36 denotes a workpiece stopper, which is supported by the feed table box 32 via a stopper frame 37. A workpiece magazine 38 is arranged on the horizontal extension line of the stopper 36, and the magazine 38 is supported by a magazine stand 40 via a bracket 39. The magazine 38 extends close to the stopper surface 36a of the stopper 36, and the workpiece W is inserted between the magazine 38 and the stopper surface 36a.
A slit exit portion S through which the pusher grate 33 can pass is formed.

This is a pusher plate for a 42-hammer magazine, and is supported by an air cylinder 43 so as to be movable up and down. The air cylinder 43 is fixed to the slider 44,
The slider 44 is supported by two guide trays μ45 parallel to the magazine 38 so as to be movable in the rail length direction, and can be moved at a constant speed in the direction of arrow B by an appropriate drive device. The rail 45 is supported by the magazine stand 40 via a suspension stand 46 and a support arm 47.

As shown in FIG. 4, the magazine 38 has a pentagonal cross-section that opens upward.

The final workpiece detection device for detecting the supply of the final workpiece W' includes, for example, as shown in FIG. A detection switch mechanism 51 is provided. The counter 50 is fixed to the bracket 31 and faces the rear collar 34a of the rod 34, so that the collar 34a comes into contact when the cylinder 14 is extended. The number of workpieces W stored in the magazine 38 is preset in the detection switch mechanism 51, and when the counter 5o counts the final workpiece W', the switch mechanism 51 is turned on.
state, and the shooter bottom plate 24 (FIG. 2) is lowered. A limit switch 52 for starting the ejection device is arranged below the shooter bottom plate 24.

The final workpiece discharge device 53 (FIG. 3) includes a rotating drum 54
and a band-shaped steel belt 55 wound around the drum 54.
and a pair of feed rollers 56 and the like. The drum 54 is fixed to a vertical drive shaft 57.
is rotatably supported by the feed table box 32, and includes a first chain transmission 58, a reduction gear 59, ! It is operatively connected to a discharge device drive motor 62 via a two-chain transmission 6o and a transmission 61. Further, the feed rollers 56 are each fixed to a vertical rotation shaft 63, and one rotation shaft 63
are interlockingly connected to each other via a pair of gear sets 64, and one rotating shaft 63 is interlockingly connected to a speed reducer 59.

Reference numeral 66 denotes a speed change handle that adjusts the speed ratio and changes the workpiece discharge speed as required. The drive motor 62 for the discharge device is connected to the shooter bottom plate 24.
(Fig. 2) is connected to the limit switch 52, and when the switch 52 is turned on, it is activated and the drum 54
is rotated in the direction of the arrow in FIG. 1, and both feed rollers 56 are rotated in the directions of arrows E and B, respectively.
The tip 55a of the steel belt 55 is connected to the shooter side plate 2.
Aligned in the same vertical plane as the workpiece passage between 3 and
It passes between the image feed rollers 56 and extends to a position where it does not interfere with the bottom plate 24, as shown in FIG.

Reference numeral 72 in FIG. 2 is a photoelectric stroke end detection mechanism, which is connected to the ejection device drive motor 62 and the feed drive motor 22, and when it detects the stroke end hole 73 formed in the middle of the belt 55, Drive motor 62.
22 to the reverse state, and the drum 54 and roller 56 in FIG.
By rotating the belt 55 in the opposite direction, the belt 55 is wound back to the state shown in FIG. When the stroke end hole 73 reaches the position of the detection mechanism 72, the tip end 55a of the belt 55 passes between both grindstones 1 in FIG. 1 and extends to the workpiece discharge side.

Although not shown, workpiece guide plates are provided above and below the workpiece passage in the grinding machine.

(Function) Before starting work, the bottom plate 24 of the shooter 13 is in a raised state as shown in FIG.
is retreated toward the reverse arrow A side from the end on the reverse arrow A side when the bottom plate 24 is lowered.

A predetermined number of ring-shaped workpieces W, for example 700, are stored in the magazine 38 (FIG. 3), and are pressed toward the stopper 36 by a magazine crusher plate 42. The detection switch mechanism 51 also has a counter 5.
It is set so that when 0 counts the 700th sheet, it turns on.

When the grinder is started, the pusher cylinder 1 shown in Figure 2
4 is activated, and the workpieces W are pushed out one by one to the shooter 13. The workpiece W rolling in the six directions of the arrows within the shooter 13 is sent into the grinding machine by the feed belt device 12#c, and both sides of the workpiece W are ground by both grindstones 1. The ground workpiece W is pushed out to the discharge side by a workpiece W sent later.

During the grinding work, the magazine pusher plate 42
(FIG. 3) moves in the direction of arrow B as the workpieces W in the magazine 38 decrease, and maintains the state in which the workpieces W are pressed against the stopper 36.

When the pusher cylinder 14 pushes out the final workpiece W' into the shooter 13 and the counter 5o counts the 700th piece, the switch mechanism 51 is actuated to retract the bottom plate elevating cylinder 28 (Fig. 2). , the end of the bottom plate 24 on the side of the reverse arrow A is lowered. When the bottom plate 24 is lowered to a horizontal state, the limit switch 52 is turned on and the discharge device drive motor 62 begins to rotate.

Due to the rotation of the drive motor 62, the drum 54 and feed roller 56 in FIG.
' direction at a constant speed, the belt tip 55a passes between the shooter and side plate 23 and between the feed plate /l/) device 12, and projects between the two grinding wheels 1, and the final workpiece W' is transferred to the two grinding wheels 1.
Discharge from between at a constant speed.

When the belt 55 extends to the discharge side (and reaches the stroke end, the stroke end detection device 72 detects that the belt 5
5 is detected, thereby causing the drum 54 and feed roller 56 to rotate in the opposite direction, thereby rewinding the belt 55 to the state shown in FIG.

(Another Embodiment) (1) As the final workpiece discharge member, instead of the steel belt 55 shown in FIG. 1, a belt-shaped MO nylon or a belt-shaped ultra-high molecular polyethylene can be used. However, it is preferable that the material has a suitable hardness so that the final workpiece can be extruded.

(If there is sufficient space for the grinding machine, for example, a long linear steel plate may be used as the final workpiece discharge member, and the drum 54 shown in Fig. 1 may be omitted.) If a plate or the like is used, the steel IL/plate is moved by a rack, pinion mechanism, etc.

(3) As a final workpiece detection device, instead of the counter 50 and switch mechanism 51 in FIG. 3, for example, a device at the end of the guide tray/I/45 on the arrow B side in FIG. A limit switch 80 may be provided so that the cylinder 43 comes into contact with the limit switch 80 at the same time that the pusher plate 42 comes into contact with the trunk surface 36a, thereby starting the drum 54 and the like.

(4) Although the illustrated embodiment is a surface grinder with horizontal axes facing each other, the present invention can also be implemented in a surface grinder with a chamber axis facing each other.

(Effects of the Invention) (1) A final workpiece detection device, for example, a counter group and detection switch mechanism 51, and a final workpiece discharge device 53 having a discharge member such as a steel plate 55, and the detection device detects the final workpiece. When the supply of There is no need to manually discharge the grinding knee, improving the efficiency of grinding work. In other words, complete automation of work can be achieved.

(2) Since the final workpiece is extruded at a constant speed, the yield of the final workpiece is improved. That is, the grinding accuracy of the workpiece from the beginning to the end is maintained at a high level and constant, and no defective products occur.

(3) Steel belt (discharge member) as shown in Figure 1
55 is wound up on the drum 54 or the like, the discharge device 53 can be made compact.

[Brief explanation of drawings]

Figure 1 is a plan view of a double-head surface grinder to which the present invention is applied, Figure 2 is an enlarged view of Figure 1 in the direction of the ■ arrow, Figure 3 is a view of Figure 1 in the direction of the It is a sectional view taken along IV-IV in the figure. l −
... Grinding stone, 12.13, 14... Belt feeding device, shooter, differential cylinder (feeding device)
, 50.51...Counter, detection switch mechanism (an example of a final workpiece detection device), 53...A final workpiece discharge device, 55...Steel belt (an example of a discharge member) Patent applicant Jinsho Seiki Co., Ltd. company

Claims (1)

[Claims] Final processing that detects the supply of the final workpiece in a double-head surface grinder equipped with two rotating grindstones that face each other with a gap between them and a tweed device that sequentially and continuously feeds multiple workpieces between the two grindstones. comprising an object detection device and a final workpiece discharge device having a belt-shaped workpiece discharge member that can freely extend from the workpiece supply side to the workpiece discharge side through between both grinding wheels at a constant speed,
A double-head surface grinder characterized in that when a detection device detects a final workpiece, a discharge device is activated to push and discharge the final workpiece at a constant speed.