JP2554538Y2 - Automatic honing tool changer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic honing tool changer.

[0002]

2. Description of the Related Art A honing apparatus for grinding an inner surface of a workpiece such as a cylinder block of an automobile engine is provided with a plurality of tool heads having different diameters so that inner surfaces having various processing diameters can be machined. The tool head can be automatically attached and detached and exchanged by an automatic exchange device. Since the tool head of the honing device is generally connected to the main shaft via a universal joint, the tool head is prevented from swinging and coming into contact with the edge of the machining hole of the workpiece when inserted into the machining hole of the workpiece. A tool guide ring is provided for each tool head to guide the tool into the machining hole. Conventionally, the tool guide ring has been manually replaced each time the tool head is replaced, or automatically replaced by a rotary indexing device.

[0003]

However, manual replacement of the tool guide ring is very time-consuming and requires a long time for replacement. Further, the rotary indexing device has a problem that a large space is required around the main shaft. An object of the present invention is to provide an automatic honing tool changing device which has a simple structure with a small space and can replace a tool guide ring at the same time as changing a tool head. Is what you do.

[0004]

In order to achieve the above object, the present invention provides a tool head box selected from a plurality of tool head boxes for storing tool heads having different machining diameters according to a machining hole of a workpiece. Is moved to the machining position, and the tool head is attached to or removed from the spindle, and a tool guide ring for guiding the tool head to the machining hole of the workpiece is indexed to the machining position corresponding to the tool head, or the machining position is determined. In an automatic honing tool changing device that is detached from the honing tool, the honing tool is integrally provided below each of the tool head boxes,
A tool guide ring box that holds a tool guide ring corresponding to a tool head stored in the tool head box so as to be able to move up and down, and that can release the tool guide ring only at an ascending position; Work clamp means provided so as to be unclamped and capable of lifting up the tool guide ring at the unclamping position to be disengaged in a horizontal direction from the tool guide ring box, and a tool guide ring pushed up by the work clamp means And a tool guide ring clamping means for clamping and clamping the plate from the horizontal direction.

[0005]

According to the above construction, when the tool head box moves to the processing position, the tool guide ring box also moves to the processing position. When the workpiece is unclamped by the workpiece clamping means, the tool guide ring is pushed up, and the tool guide ring can be detached from the tool guide ring box. The tool head is connected to the main shaft to be separated from the tool head box, and the tool guide ring is clamped by the tool guide ring clamping means, and then the tool head box is returned to the initial position. As a result, the tool guide ring remains at the processing position. Subsequently, when the workpiece is clamped by the workpiece clamping means, the mounting of the tool head,
The indexing of the tool guide ring is completed. In order to remove the tool head and the tool guide ring in order to replace the tool head with another tool head, the operation reverse to the above-described mounting operation is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to the drawings. 1 and 2 show an automatic honing tool changing device according to the present invention. In the figure, 1 is a processing head column, and 2 is a work table. A frame 3 is constructed around the worktable 2, and a movable frame 6 is provided between the side beams 4a of the frame 3 via an LM guide 5 provided along the side beams 4a.
Has been erected. The movable frame 6 is movable in the front-rear direction by a drive cylinder 7 provided on the side beam 4a. A moving screw 10 rotatably driven by a motor 9 is provided between brackets 8 projecting from both ends of the movable frame 6. The movable frame 6 has a tool holding plate 12 via an LM guide 11.
Are slidably mounted in the left-right direction. The tool holding plate 12 is movable left and right by the motor 9 when the moving screw 10 is screwed into the projection 13.

The tool holding plate 12 has a plurality (four) of tool head boxes 1 for storing a tool head 14.
5 and a tool guide ring box 17 for holding a tool guide ring 16 are attached. As shown in FIG. 1, the tool head 14 has a connection shaft 20 connected to a processing whetstone 18 via a first universal joint 19. The upper end of the connecting shaft 20 of the tool head 14 is connected to the lower end of the main shaft 21 by the second universal joint 2.
2 and is connected to the quick joint 23 connected thereto. An engagement pin 25 that engages with the engagement groove 24 of the quick joint 23 protrudes from the connection shaft 20. The proper position of the engagement pin 25 is detected by a tool presence / absence detection sensor 27 provided at the center of the front beam 4b of the frame 3 via a bracket 26. Tool guide ring 1
Reference numeral 6 denotes a cylindrical member into which the processing grindstone 18 of the tool head 14 can be inserted. At the lower end of the tool guide ring 16, as shown in FIG. 3, a fitting portion 28 that fits into a tool insertion hole 51 of a clamp plate 46, which will be described later, and a lower flange portion 29 that contacts the edge of the tool insertion hole 51. The upper flange 30 is formed at the upper end to engage with a step 41 of the tool guide ring box 17 described later.

As shown in FIG. 3, the tool head box 15 is fitted into a cup-shaped outer box 31 fixed to the tool holding plate 12 and slidably fits inside the outer box 31 in the vertical direction. It comprises an inner box 33 urged upward by a spring 32 and an annular stopper 34 attached to the upper end of the outer box 31 to prevent the inner box 33 from slipping upward. The inner boxes 33 of the four tool head boxes 15 have different inner diameters, and the tool heads 14 having different diameters are fitted and stored. As shown in FIG. 2, positioning pins 35 project from the bottom of the inner box 33 in different arrangements for the respective tool head boxes 15 so that only predetermined tool heads 14 are fitted. As shown in FIG. 3, a detection rod 36 for detecting tool insertion abnormality is attached to the outer peripheral surface of the inner box 33, and the detection rod 36 penetrates a through hole 37 of the outer box 31 and protrudes outward. .

The tool guide ring box 17 is shown in FIG.
As shown in the figure, the tool head box 15 is attached below the stays 38 and bolts 39. As shown in FIG. 4, the tool guide ring box 17 forms a U-shaped notch 40 into which each tool guide ring 16 fits, and the notch 40
Is formed with a C-shaped step portion 41 with which the upper flange portion 30 of the tool guide ring 16 is engaged. Then, the tool guide ring 16 fitted into the notch 40 of the tool guide ring box 17 is, as shown in FIG.
The upper collar portion 30 moves up and down the gap between the tool guide ring box 17 and the tool head box 15, and is normally pressed downward by a leaf spring 42 attached to the bottom surface of the tool head box 15, The upper flange portion 30 is engaged with the step portion 41 and cannot be removed in the horizontal direction. When the tool guide ring 16 moves upward, the engagement between the upper flange portion 30 and the step portion 41 is released, and the tool guide ring 16 can be separated from the notch portion 40 in the horizontal direction. As shown in FIG. 1, the presence of the tool guide ring box 17 is detected by a tool guide ring presence / absence detection sensor 44 attached to the front pillar 4c of the frame 3 via the bracket 43, as shown in FIG. ing.

As shown in FIG. 1, the work head column 1 is provided with a work clamping device 47 comprising a clamp cylinder 45 and a clamp plate 46. The clamp cylinder 45 is vertically attached to the processing head column 1 via a bracket 48. The clamp plate 46 is attached to the lower end of the rod of the clamp cylinder 45. A cylindrical clamp guide 49 is erected on the clamp plate 46.
The guide rod 50 attached to the bracket 48 is slidably fitted to the bracket so that no run-out occurs when moving up and down. A tool insertion hole 51 is formed in the clamp plate 46, and a clamp ring 52 is fixed to a lower edge of the tool insertion hole 51.

A guide ring clamp device 53 is provided on the upper surface of the clamp plate 46, as shown in FIG. This device 53 includes a pair of clamp arms 54 and a clamp cylinder 55. Each clamp arm 54 is provided at its base in parallel between a pair of brackets 56 fixed to a clamp plate 46.
The guide bar 57 is inserted and can be moved in the horizontal direction. The clamp cylinder 55 is attached to a bracket 56, and the tool guide ring 16 is clamped or unclamped by synchronously driving the pair of clamp arms 54. Further, the tip of each clamp arm 54 is prevented from rising by a guide 58. Further, the clamp surface of the clamp arm 54 is formed into a curved surface along the outer surface of the tool guide ring 16, and the lower edge of the clamp surface is chamfered as shown in FIG.

As shown in FIG. 1, a tool insertion abnormality detection sensor 61 is attached to the machining head column 1 via a bracket 60, and the tool guide ring box 17 is used to detect a tool insertion abnormality. By detecting the proper position of the bar 36, it is detected whether or not the tool head 14 has been properly inserted into the tool guide ring box 17.

In the automatic honing tool changer having the above-described configuration, the drive cylinder 7 and the motor 9 of the frame 3, the clamp cylinder 45 of the workpiece clamp device 47, and the guide ring clamp device 53 are controlled by a control device (not shown). By controlling the clamp cylinder 55, the tool head 14 is automatically replaced, and at the same time, the tool guide ring 16 is also automatically replaced. Hereinafter, the operation will be described. Now, when data such as the type of a workpiece (cylinder block) 62 to be machined is input to a control device (not shown), the tool head box 15 in which the tool heads 14 corresponding to the cylinder diameters of the workpiece 62 are stored, It is selected from the four tool head boxes 15 of the tool holding plate 12. Next, the motor 9
Is driven to rotate the moving screw 10, the tool holding plate 12 moves in the X direction in FIG. 2, and the selected tool head box 15 is positioned in front of the main shaft 21.

At this time, as shown in FIG. 1, a sensor 27 for detecting the presence or absence of the tool detects whether or not the engaging pin 25 of the tool head 14 is at an appropriate position. 15 or the positioning pin 35 is not properly fitted to the tool head 14, the tool head 1
4 is not moved to the processing position. Further, the sensor 44 for detecting the presence or absence of the tool guide ring detects whether or not the tool guide ring 16 is held in the tool guide ring box 17, and if not held, the tool head 14 is not moved to the processing position.

When it is detected that the tool head 14 is at an appropriate position and the tool guide ring 16 is held, the drive cylinder 7 is driven to move the movable frame 6 in the Y direction in FIG. The tool head box 15 thus positioned is located immediately below the main shaft 21 as shown in FIG. Next, the clamp cylinder 45 of the workpiece clamp device 47 is driven to move the clamp plate 46 from the position indicated by the two-dot chain line in FIG. 7 to the position indicated by the solid line. Thereby, the fitting portion 28 of the tool guide ring 16 fits into the tool insertion hole 51 of the clamp plate 46, and
As a result of the edge of the tool insertion hole 51 pressing the lower flange 29 of the tool guide ring 16, the tool guide ring 16 is pushed upward, and the engagement between the upper flange 30 and the step 41 of the tool guide ring box 17 is increased. Is canceled.

Subsequently, the main shaft 21 is lowered, and the engaging pin 25 at the upper end of the tool head 14 is engaged with the engaging groove 24 of the quick chuck 23 at the lower end, and the main shaft 21 and the tool head 14 are connected. Thereafter, as the main shaft 21 rises,
The tool head 14 is separated from the tool head box 15. While the main shaft 21 is raised, the clamp cylinder 55 of the guide ring clamp device 53 is driven, and the clamp arm 54 clamps and clamps the tool guide ring 16. At this time, as shown in FIG. 6, when the tool guide ring 16 is not completely fitted in the tool insertion hole 51 of the clamp plate 46, the inclined surface 59 of the clamp arm 54 is Is pressed downward, so that the tool guide ring 16 is correctly fitted into the tool insertion hole 51 while the clamp arm 54 is closed.

When the clamping of the tool guide ring 16 by the clamp arm 54 is completed, the drive cylinder 7 of the frame 3 is driven to move the movable frame 6 backward in the direction opposite to the Y direction. Here, since the tool head 14 has already been separated from the tool head box 15 and the upper flange portion 30 of the tool guide ring 16 has been separated from the step portion 41 of the tool guide ring box 17, the tool head box 15 and the Only the tool guide ring box 17 moves, and the tool guide ring 16 remains at the processing position while being clamped by the guide ring clamp device 53. Following the retreat of the movable frame 6, the motor 9 is driven to move the tool holding plate 12 in the direction opposite to the X direction in FIG. 2, and the tool head box 15 returns to the original position.
On the other hand, the clamp cylinder 45 of the workpiece clamping device 47
Drives to lower the clamp plate 46 to the position indicated by the two-dot chain line in FIG. Thus, the clamp ring 52 is pressed against the workpiece 62 and the workpiece 62 is clamped. Thus, the automatic mounting of the tool head 14 and the tool guide ring 16 is completed.

At the start of machining of the workpiece 62 by the tool head 14, as the main shaft 21 descends, as shown in FIG.
The processing grindstone 18 at the lower end of the tool head 14 connected to the main shaft 21 via the main shaft 9 and the tool guide ring 16
The work piece 62 is inserted into the cylinder of the workpiece 62 while being guided, so that the outer peripheral corner of the lower end of the processing grindstone 18 does not hit the workpiece 62, which is safe. When the processing of the current workpiece 62 is completed and the tool head 14 and the tool guide ring 16 are to be replaced next for processing a different type of workpiece, an operation reverse to that at the time of mounting the tool is performed. These are removed first. That is, first, the clamp plate 46 is raised and the tool guide ring 1
6 moves upward. Next, the tool holding plate 12 and the movable frame 6 of the frame 3 move, and the empty tool head box 15 and the tool guide ring box 17 are located at the processing position. At this time, since the tool guide ring 16 is located upward, the notch 40 of the tool guide ring box 17 fits into the tool guide ring 16 as shown in FIG.

Subsequently, the main shaft 21 is lowered, the tool head 14 is fitted and stored in the tool head box 15, and the clamp arm 54 is opened to release the clamp. Whether or not the tool head 14 is properly stored in the tool head box 15 is detected by a tool insertion abnormality detection sensor 61. For example, tool head 1
If the position of the pin hole 14a is shifted in the rotation direction and the pin hole 14a is not engaged with the positioning pin 35 of the tool head box 15, the lower end of the tool head 14 contacts the positioning pin 35 and the inner box 33 is moved. As a result of being depressed and the position of the detection rod 36 being shifted downward, the tool insertion abnormality detection sensor 61 does not detect the detection rod 36,
Tool insertion error is detected. In this case, when the tool head 14 is appropriately rotated and returned to an appropriate position, the positioning pin 35 is engaged with the pin hole 14a of the tool head 14, the inner box 33 is pushed up by the spring 32, and the detection rod 36 is returned to the original position. The sensor 6
1 detects this.

When it is detected that the tool head 14 has been inserted normally, the quick chuck 23 is opened and the main spindle 2 is opened.
1 rises, and then the clamp plate 46 descends.
As a result, the tool guide ring 16 is also lowered, and the upper flange 30 is moved to the stepped portion 41 of the tool guide ring box 17.
Engages. When the movable frame 6 and the tool holding plate 12 move, the tool head 14 is stored in the tool head box 15, and the tool guide ring 16 is held by the tool guide ring box 17 and returns from the processing position to the storage position. Note that the mounting operation of the new tool head 14 and the tool guide ring 16 is as described above, and thus the description is omitted.

[0021]

As is apparent from the above description, according to the present invention, the tool guide ring is automatically replaced at the same time as the tool head is replaced, so that the replacement operation is quick and easy. In addition, a tool guide ring box is provided below the tool head box, and the tool guide ring moves to the processing position at the same time as the movement of the tool head box, and is replaced by the operation of the workpiece clamp means and the guide ring clamp means. So the structure is simple,
No special space for tool guide ring replacement around the spindle is required.

[Brief description of the drawings]

FIG. 1 is a side view of the automatic honing tool changing device according to the present invention.

FIG. 2 is a plan view of the automatic honing tool changing device shown in FIG. 1;

FIG. 3 is a sectional view of a tool head box.

FIG. 4 is a diagram showing a tool guide ring box in a cross section taken along line II of FIG. 3;

FIG. 5 is a plan view of the guide ring clamp device.

6 is a sectional view taken along line II-II in FIG.

FIG. 7 is a side cross-sectional view showing a tool head replacement state.

[Explanation of symbols]

14: Tool head, 15: Tool head box, 16: Tool guide ring, 17
... Tool guide ring box, 21 ... Spindle, 47 ...
Workpiece clamping device, 53: Guide ring clamping device, 62: Workpiece.

Claims (1)

(57) [Scope of request for utility model registration] 1. A tool head box selected from a plurality of tool head boxes storing tool heads having different machining diameters, which is selected according to a machining hole of a workpiece, is moved to a machining position, and a tool head is attached to a main spindle, or In the automatic honing tool changing device, which is detached from the main shaft and a tool guide ring for guiding a tool head to a machining hole of a workpiece is indexed to a machining position corresponding to the tool head, or is separated from the machining position. A tool guide ring corresponding to a tool head stored in the tool head box is integrally provided below each tool head box, and the tool guide ring is held so as to be able to move up and down. Tool guide ring box and work clamp from above Work clamp means provided so as to be clampable and capable of lifting the tool guide ring at an unclamping position to be detachable in a horizontal direction from the tool guide ring box; and a tool guide ring pushed up by the work clamp means. An automatic honing tool changing device, comprising: a tool guide ring clamping means for clamping by clamping in a horizontal direction.