RU2576064C1 - Device for milling cutter position setting - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device for the cutting mill position setting contains a shuttle-type carriage, between which movable plates on the axis of rotation in the bearing supports a working shaft with the cutting mill is installed, it is connected with the motor by a belt drive. The axis of rotation of the carriage coincides with the motor axis, and the piston rod of the crank-and-rod mechanism installed on the bedplate by one end is connected by a hinge joint with an axle secured in one of the movable plates of the carriage, and another end is connected by a hinge joint with a screw pair.

EFFECT: invention increases the accuracy of the cutting mill position setting, and reduces expenses for the device manufacturing.

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Description

The invention relates to structural elements of woodworking machines and is intended to adjust the cutter to the size of the removed allowance.

The working shafts of milling woodworking machines in order to increase structural rigidity and vibration resistance are installed, as a rule, on the bed motionless, less often with a single-axis adjustment in a vertical plane.

A device that moves a cutting tool with two- or three-coordinate adjustment is known, while the spindle is driven directly from the engine. The vertical movement of the spindle is carried out with the help of a screw, and is fixed with a stopper (see Amalitsky VV Woodworking machines and tools: Textbook for secondary vocational education / VV Amalitsky, VV Amalitsky. - M .: Publishing Center "Academy", 2002. - 400 p. - S.

 233).

Known spindle unit of a milling machine with a lower spindle arrangement. The spindle is moved in height by means of a screw pair (see Amalitsky V, V. Woodworking machines and tools: Textbook for secondary vocational education / VV Amalitsky, VV Amalitsky. - M.: Publishing Center "Academy" ", 2002. - 400 p. - S. 233-235).

A known mechanism for adjusting the upper horizontal support of a four-sided longitudinally milling machine. The support is moved by rotating the handwheel mounted on the screw, and at the same time the magnitude of the movement on the scale is read (see Korotkov V.I. Woodworking machines: Textbook for the head of vocational education / Victor Ivanovich Korotkov. - M.: Publishing Center "Academy", 2003. - 304 p. - S. 175).

A disadvantage of the known devices is the low accuracy of tool installation, set by the pitch of the screw.

The known mechanism for adjusting the position of the milling cutters of the "dovetail" type from flywheels (see patent RU 2497661, class B27C 9/04, publ. 10.11.2013). A disadvantage of the known mechanism, as well as other tuning mechanisms using guides of various shapes, is the complexity of their manufacture and ensuring the accuracy of the dimensions on the contact length of the mating parts.

The objective of the invention is to remedy these disadvantages. The technical result consists in the use of a pendulum-type caliper, the area of the contact surfaces of the parts of which is smaller than that of mechanisms with guide elements, in the use of a crank mechanism for moving the caliper and cutter, the gear ratio of which increases the accuracy of the cutter installation, in the installation of the caliper on the same axis with the motor shaft, which allows the movement of the caliper without changing the belt tension.

The problem is solved, and the technical result is achieved by the fact that the device for adjusting the position of the cutter contains a pendulum-type support, between the movable plates of which are mounted on the axis of rotation, a bearing shaft with a cutter connected to the engine by a belt drive is installed in the bearings. The axis of rotation of the caliper coincides with the axis of the engine, and the connecting rod of the crank mechanism mounted on the bed is connected at one end with a hinge to an axis fixed in one of the movable plates of the caliper and at the other end through a hinge with a screw pair.

In the drawing of FIG. 1 and FIG. 2 presents the proposed device for adjusting the position of the cutter. In the drawing of FIG. 1 shows a front view of the device, in the drawing of FIG. 2 shows a side view of the device.

The device comprises a caliper 4 connected to the engine by a belt drive 5. The caliper is mounted on the bed 7 so that its axis of rotation 3 coincides with the axis of rotation of the engine shaft 6. Between the plates 2 and 11 fixed on the axis of rotation in the bearing bearings 8 there is a working shaft 9 s a milling cutter mounted on it 10. The movable plate 2 is connected by an axis 1 through a hinge 15 with a connecting rod 12, the other end of the connecting rod is connected through a hinge 16 with a screw pair 13, 14. The distance (a) between the axis of rotation of the caliper 3 and the axis 1 connecting the plate to the connecting rod is the length of the crank na.

In the drawing of FIG. 3 shows a diagram of the operation of the device. The device adjusts the position of the cutter as follows. When setting the milling cutter to the specified machining size, the nut 17 is turned off and the screw 13 is turned by the flywheel to move the connecting rod 12, which, transmitting the force from the rotation of the screw, moves the plate 2, and with it the shaft 9 and the milling cutter 10 around the circumference relative to the axis 3. After setting screw 13 is locked by nut 17.

In the diagram of FIG. 3 dashed-dotted lines show the position that the caliper will occupy when moving the screw a distance (s). The vertical milling cutter moves a distance equal to (d).

The gear ratio of the mechanism depends on the ratio of the length of the crank (distance a) to the length of the connecting rod: the longer the length of the crank relative to the length of the connecting rod, the greater the gear ratio of the setting mechanism. In the adopted scheme, a = 48 mm, b = 40 mm, c = 14 mm, d = 4.5 mm.

i = 14: 4.5 = 3.1. Gear ratio 3: 1.

In this example, the use of a crank mechanism for positioning the cutter increased the adjustment accuracy by a factor of 3.

Claims (1)

A device for adjusting the position of the cutter containing a pendulum-type caliper, between the movable plates of which are fixed on the axis of rotation, in the bearing bearings there is a working shaft with a mill, connected by a belt drive to the engine, characterized in that the axis of rotation of the caliper coincides with the axis of the engine, and the connecting rod is cranked - a connecting rod mechanism mounted on the bed, with one end connected by a hinge to an axis fixed in one of the movable plates of the caliper, and the other end through a hinge with a screw pair.

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