JPH01306116A - Broaching machine - Google Patents

Abstract

PURPOSE:To improve the accuracy of a broaching machine by coupling a moving table with a table lifter through a pin coupling arranged on an axis crossing perpendicularly with a broaching tool thereby maintaining the work mount table face in perpendicular to the axis of the broaching tool. CONSTITUTION:When a hydraulic cylinder 11 is driven to lift a table lifter 8 along lifter guide rails 7, 7, the driving force is transmitted through a pin coupling 12 to a foot board 4 to lift a moving table 1 along table guide rails 6, 6. Consequently, a broaching tool 2 is pulled out and the inner circumference of a work W is cut into a predetermined shape. When the table lifter 8 and the guide rail thereafter abraded, the angle of the table lifter 8 collapses around the pin coupling 12 and the moving table is not influenced. Since the pin coupling 12 for driving the moving table 1 upward is positioned on an axis crossing perpendicularly to the broach tool 2, moment with respect to the moving table 1 is zero and the moving table 1 lifts vertically.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in broaching machines.

(Conventional technology) Figures 7 and 8 show an example of a conventional broaching machine.

Reference numeral 71 denotes a movable table on which the workpiece W is placed, and a vertical broaching tool 72 is inserted perpendicularly into this table surface to fix the lower end of the broach to the door 3.

Reference numeral 74 denotes two guide rails standing vertically, and the left and right guide grooves of the sliding plate 75 are fitted inside these rails.

The sliding plate 75 and the left and right sides of the moving table 71 are integrally connected by two L-shaped hook plates 76, and one end of a vertical hydraulic cylinder 77 arranged between the guide rails 74 and 74 is connected to the sliding plate 75. Connected to the bottom surface of 75.

In this broaching machine, the hydraulic cylinder 77 is extended to raise the sliding plate 75 along the guide rails 74,74. This allows the movable table 71 to move vertically to the broaching tool 72.
The broach tool 72 is pulled out from the workpiece W on the table.

The inner or outer surface of the workpiece W is cut into a predetermined shape.

FIG. 9 shows another conventional example, in which two hydraulic cylinders 93 and 93 are placed symmetrically with respect to a vertical broaching tool 92 that supports a moving table 91, and their upper ends are connected to the lower surface of the moving table 91. do.

Then, the grooves on both the left and right sides of the moving table 91 are slidably fitted into the two vertical guide rails 94.94, and the hydraulic cylinders 93.93 are simultaneously extended to move the moving table 91 onto the guide rails 94.94. The broacher A92, which is fixed at the F end, is pulled out from the workpiece W on the table and the broach is shaved.

(Problems to be Solved by the Invention) In the conventional example shown in FIGS. 7 and 8, since the point of action of the hydraulic cylinder 77 that extends the movable table 71 is distant from the broach n 72, a moment is generated with respect to the sliding plate 75. With repeated use, a gap is likely to be formed between the guide groove of the luer 4 and the sliding plate 75 due to wear. If such a gap occurs, the sliding plate 75 and the moving table 71 Because they are integrally connected, the movable table 71 tilts downward due to the pull-out resistance (Lll cutting force) of the broacher 72, and the movable table surface is not perpendicular to the axis of the broaching tool, resulting in poor broaching accuracy. The disadvantage was that it deteriorated.

In this regard, in the case of FIG. 9, since the hydraulic cylinders 93, 93 are located symmetrically with respect to the broaching tool 92, no moment acts on the moving table 91, and the guide rails 94.9
However, it is extremely difficult to drive the two hydraulic cylinders 93 and 93 at a constant speed, and if there is even a slight speed difference, the moving table 91 will tend to tilt, causing the broach There was no change in the fact that it was difficult to maintain machining accuracy.

The present invention improves the drawback of the conventional broaching machine in that the moving table tends to tilt, and by keeping the surface of the moving table on which the work is placed perpendicular to the axis of the broaching tool, the broaching machine can be easily tilted. The purpose is to maintain and improve accuracy t.

(Means for Solving the Problems) The present invention provides a mechanism that includes a moving table, which is a precision member that must maintain a right angle to the broaching tool, and a table lifting body, which is a stress member for raising the moving table. The key point is to separate the movable table and the table elevating body from each other by means of a bottle joint arranged on the axis perpendicular to the broaching tool.

The configuration of the present invention is as follows.

First, the broach tool is vertically erected, its lower end is fixed to the pull head, and the broach tool is inserted into the moving table on which the work is to be placed.

The movable table is connected to a vertical table guide rail so as to be movable up and down.

Further, one end of a hydraulic cylinder extending in the vertical direction is connected to the table elevating body which is provided to be able to rise and fall freely along the vertical elevating body guide rail.

The movable table and the table elevating body are connected via a pair of left and right transverse bottle joints arranged on an axis perpendicular to the broaching tool.

(effect) The broaching machine of the present invention operates as follows.

When a workpiece is placed on the movable table surface and the hydraulic cylinder is extended, the table elevating body rises along the elevating body guide rail, and as a result, the movable table also rises along the table guide rail, and the broach tool pulls out the workpiece and touches the inner surface of the workpiece. or cutting the outer surface.

At this time, the movable table receives the driving force of the hydraulic cylinder via the bottle joint, but since the bottle joint is located on the axis perpendicular to the broach tool, the cutting force of the broach tool acting on the movable table and the drive of the bottle joint The combined force and moment is 0, and no wear occurs between the moving table and the table guide rail.

On the other hand, the cutting force of the broach tool acts on the table lifter at a location away from the connection point with the hydraulic cylinder, creating a moment, which may cause wear between the table lifter and the lifter guide rail. Even if the table elevating body is angularly shifted around the bottle joint as a fulcrum, the moving table will not tilt, so the moving table will always maintain a right angle to the broaching tool.

(Example) A first embodiment of the present invention is shown in FIGS. 1 to 4.

1 is a movable table on which a workpiece W is placed, and a bush (not shown) is tightly fitted between the table and the workpiece W to fix the workpiece W to the upper surface of the movable table l.

Reference numeral 2 denotes a broaching tool erected in the vertical direction, which is inserted into a pre-processed hole previously drilled in the workpiece W and a hole (not shown) in the moving table, and its lower end is fixed to the pull rod 3.

Leg plates 4, 4 are fixed to the left and right sides of the lower surface of the movable table l, and vertical guide grooves 5 are formed on both the left and right sides of the leg plates 4.4 and the movable table 1. The guide t115 is slidably fitted into the table guide rail 6.6.

Two vertical elevating body guide rails 7.7 are installed behind the table guide rail 6.6, and a table elevating body 8 is slidably installed between the rails 7.7. The table elevating body 8 consists of a sliding part 9 and a pair of left and right L-shaped connecting parts 10.10 fixed to the lower surface of the sliding part 9. A hydraulic cylinder 11 is installed vertically between these connecting parts 10.10. The upper end is connected to the center of the lower surface of the sliding part 9.

A pair of left and right bottle joints 1 are arranged on the axis perpendicular to the broaching tool 2 at the overlapping part of the connecting part IO and the leg plate 4, with the front parts of the horizontal pieces of the connecting parts io and io in contact with the inside of the leg plate 4.4.
2. Insert 12 and connect both. In the case of this embodiment, when the hydraulic cylinder 11 is driven and the table elevating body 8 is raised along the elevating body guide rail 7.7, this driving force is transmitted to the leg plate 4 via the bottle joint 12, and the movable table l is It rises along the table guide rail 6.6. As a result, the broach tool 2 is pulled out and cuts the inner circumference of the workpiece W into a predetermined shape.

In the second embodiment shown in Fig. 5.6, the table guide rail 6.6 and the elevating body guide rail 7.7 of the first embodiment are integrated, and both the movable table 1 and the table elevating body 8 are made of the same one. Connected to a pair of guide rails 13.13. Then, the sliding part of the table elevating body 8 with the rail is installed on three sides J from the top dead center of the movable table L, and the movable table 1 and the table elevating/lowering body are installed in the lower half and upper half of the guide rails 13 and 13, respectively. body 8
Make sure that they are in sliding contact.

If the upper and lower halves of the same rail are used differently in this way, even if the rail wears out due to friction with the table lifting body 8, the movable table l will not be affected.

In the first embodiment, the guide rails for the movable table and for the table elevating body are separately arranged in front and behind each other, so the table A lowering body 8 can be installed below the top dead center of the movable table 1. The overall height can be reduced.

The second embodiment has the advantage that since both the guide rails for the movable table and for the table elevating body are integrated, the occupied plane area is small.

In any of the embodiments, if there is wear between the table A lowering body 8 and its guide rail, the angle of the table lifting body 8 shifts around the bottle joint 12 as a fulcrum, so there is no effect on the movable table, and the movable table L Since the pin joint 12 that drives the needle in the negative direction is located on the axis perpendicular to the broaching tool 2, the moment with respect to the moving table 1 is O, and the moving table 1 rises vertically.

It goes without saying that the same effects can be obtained even if the present invention is applied to a horizontal broaching machine.

(Effects of the Invention) In short, in the present invention, the movable table and the table lifting body are mechanically separated and connected by a bottle joint arranged on the axis perpendicular to the broaching tool. When the table lifting body is raised, the combined moment of the cutting force of the broach tool and the driving force of the bottle joint acting on the moving table is 0, and the moving table is vertically 1: jf L The right angle between the table and the broach tool is 0. always maintained.

Moreover, even if the table lifting body tilts due to wear with the lifting body guide rail, the angle will shift using the bin joint as the fulcrum.
There is no effect on the movable table.Therefore, in order to raise the table lifting body, there is no problem even if the hydraulic cylinder is located far from the point of application of the cutting force of the broaching tool, so one hydraulic cylinder is sufficient.

Therefore, although the structure is simple, the movable table surface can always be kept perpendicular to the broaching tool, making it possible to perform highly accurate broaching.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of the present invention, with Figure 1 being an overall side view, Figure 2 being a front view with the table lifter omitted, and Figure 3 taken along line A-A in Figure 1. 4 is a plan view of FIG. 3. Figures 5 and 6 show the second embodiment, and Figure 5 is its overall side view;
FIG. 6 is a front view thereof. FIG. 7 is a side view of the conventional example, and FIG. 8 is a plan view thereof. FIG. 9 is a front view of another conventional example. 1 is a moving table, W is a workpiece, 2 is a broach tool, 3
is a pull head, 6 is a table guide rail, 7 is a lifting body guide rail, 8 is a table lifting body, 11 is a hydraulic cylinder,
12 is a bottle joint, 13 is a guide rail. Patent applicant: Autic Co., Ltd. (and 1 other person) Agent: Tobe Maki (and 3 others) Figure 1 Figure 4 Figure 11 Figure 3 Figure 7 Figure 9

Claims (1)

[Scope of Claims] A broaching tool is erected vertically and its lower end is fixed to a pull head, and the broaching tool is inserted into a movable table on which a work is to be placed, and the movable table is connected to a vertical table guide rail. One end of a hydraulic cylinder extending in the vertical direction is connected to a table elevating body which is connected to the movable table so as to be movable up and down, and which is movable up and down along the vertical elevating body guide rail. with the body,
A broaching machine connected through a pair of left and right horizontal pin joints arranged on an axis perpendicular to the broaching tool.