SU51142A1 - Adaptation to an electromagnetic copying milling machine Tina Keller for reverse copying on the product in the manufacture of dies or molds - Google Patents

Description

It is now widely known to use Keller-type electromagnetic copy milling machines, also used in the manufacture of dies and molds. The process of making a stamp or a mold is usually that on a finished part, for the production of which it is required to make a stamp, a mold is made of gypsum, wood, etc., and then a Keller type machine is copied from this mold using a KELLER machine tool. on the workpiece.

For the manufacture of stamps directly from the finished part, for example, it is required, according to the convex relief of the part, to create precisely the corresponding shape, in this case, the concave relief of the stamp or the mold. The proposed adaptation to a Keller type machine allows the manufacture of dies directly over the finished part to eliminate the use of gypsum or other forms and the associated costs and loss of time.

In the manufacture of stamps, etc., for ready-made parts using the method of reverse copying, each protrusion on the part corresponds to a recess in the manufactured product.

According to the invention, in the device a contact device for a copier is applied, consisting of several spring-loaded fingers located along the forming cutter and pressed against the copier under the pressure of the working medium; Each of these fingers separately serves, when meeting its emphasis, with a recess or a copier protrusion to control the cutter pockets by deflecting the pins supporting the frame to act on the corresponding circuit contacts of a conventional electrical control.

In FIG. 1 is a diagram of a conventional copy job on a Keller type machine; FIG. 2 is a pattern of work for backing up a product; FIG. 3 is a diagram of three stages of the reverse copying operation;

FIG. 4-proposed contact device for a copier; FIG. 5 is the same for working with a flat copier.

In normal work on the Keller machine copy machine, the workpiece and the copier are mounted on a vertical fixed plate / (Fig. 1). The spindle 2 with the cutter is located in the headstock, which can move horizontally in the direction perpendicular to the plate 1 and vertically along the column; the column in turn can be horizontally moved along guides parallel to the base of the plate 1. All three feeds and the spindle drive are equipped with individual motors; switching and reversing of feeds is carried out by electromagnetic clutches that are switched on from an automatic device through high-speed relays.

At a fixed distance a from the spindle, there is an automatic pointer 5 fixed on the milling head; the end of the pointer, having the same shape as the cutter, slides over the top of the copier. When milling over relief, the cutting is automatically fed in a vertical direction, as shown in FIG. 1 or in a horizontal direction parallel to the plate /; the end of the automatic pointer 3 describes the curve corresponding to the profile of the copier; the same curve describes the end of the cutter.

If the pressure on the pointer is weak or it doesn’t touch the copier at all, then the contacts 4 are closed and the relay is turned on forwards, due to which the electromagnetic coupling switches the horizontal movement towards the plate 7 with the product fixed on it.

If the pressure of the pointer 5 on the surface of the copier is large, then the rod of the pointer 5 will press on the lever 5, turn it around an axis and close contact 6, turning on the relay to move backwards, i.e. to the feed in the direction from the plate. When the pointer is overloaded, contact 7 is opened, and the flow feed (in this case, vertical, top to bottom) is stopped until the pressure decreases. Cutting takes place in vertical or horizontal rows; after the passage of each row, the feed is turned in the direction perpendicular to the feed of the cut, due to which the milling headstock is shifted by a certain amount.

FIG. 2 shows the pattern of the reverse copying device. The workpiece (for example, a stamp or a mold) and a part serving as a sample are fixed motionless on the plate. The part is reinforced in such a way that from the rear side (in the drawing on the right) there is free access to it. The automatic pointer 2 of the proposed device, rigidly connected to the milling head, touches the surface of the part from the rear side. From pointer 2, there are as many wires and the same destination as from the pointer in a conventional Keller-type machine.

The automatic pointer 2 for backing up, instead of an insert corresponding in shape, has several thin fingers 5 (for example, four) located along the generators corresponding to the geometrical shape of the cutter. Normally all fingers touch the surface; if a protrusion falls under one of the fingers, which presses on it, the finger is automatically inserted into the body of pointer 2 so that it only slightly presses the part. When working on any uneven relief, at least one finger is always extended from the body of pointer 2 to the full length b and controls the feed of the milling cutter in the direction perpendicular to the plate. If all fingers receive significant pressure from the bump of the part and retracted, the feed will turn on in the forward direction, i.e. the cutter will go into the product and pointer 2 will move away from the part; if, on the contrary, one of the fingers is relieved of pressure on the surface of the part.

Turns on the feed in reverse on the: board, and the cutter will exit the product and the pointer will approach the part.

FIG. 3 shows the process of backing up in several stages; from the drawing, one can see how the fingers are drawn in when bypassing the protrusions of the part. Relief milling takes place in rows, as during normal operation of a Keller type machine. As usual, all movements of the machine should be limited to limit switches.

The device of the proposed pointer (Fig. 4) consists of a metal body / with four cylinders for pistons 2 that move the fingers 3. To move the piston from left to right, there is a coil spring 4, but the movement from right to left occurs under the pressure of a fluid or air, coming from the bottom through a throttling hole, fitted with an adjusting screw 5. Each piston has a hole, closed by a steel ball 6, screwed onto the end of the rod 7, which passes through the gland in the cylinder head and with schyu cartridge from rigidly connected with plug 3. The fingers 3 finger freely pass through the openings in the frame 9; in the extreme left position of the pistons, the cartridges 8 abut against the frame 9 and act on the contacts 10, 11, and 12 associated with it.

Work pointer is as follows. While external forces do not act on the finger 3 or they are too small, the ball 6 is pressurized by a fluid (or air) to its seat, as a result of which the aperture of the piston 2 is closed and the latter goes to the left under pressure, compressing the spring 4. When the end of the finger 3 the ball 4 will move away from the saddle, the pressure under the piston will drop and, due to throttling of the liquid through the hole with the screw 5, the movement of the piston 2 will stop. When this occurs, the equilibrium between the pressure of the fluid (or air) on the piston 2 on the one hand

and the spring pressure in the longitudinal direction on the finger with the other. Thus, the finger will always be pressed against the part with a certain force. FIG. 4 that lateral pressure on the finger 3 will also cause the opening of the ball valve and the retraction of the finger; in this case, the oil seal of the cylinder head will perceive lateral pressure and the support for the lever formed by the rods 7 and the pointer 3.

When any of the fingers does not touch the surface of the part, then the frame 9 will tilt away from the corresponding cartridge and close the contact // acting on the feed in the opposite direction; when the finger begins to retract, i.e. when the pressure drops, contact 10 is closed on the frame, which acts on the feed of the milling machine in the forward direction. The third contact 12 is designed to stop feeding with excessively steep ledges on the part.

In the case of complex work on a copy milling machine, it is inevitable that a part of the work be carried out with a flat copy and a part with relief. In the case of reverse copying, a reverse indicator can also be used, which differs from the usual one only by an inserter, whereas for Keller type copying machines, the insert has the shape and size of the milling cutter at the end, the back copy insert has a device consisting of a hub (Fig. 5), rotating on axis 2, and two rollers 3. The surfaces of the rollers are at a vertical distance, b, from the axis of rotation of the hub, with b being equal to the cutter radius. The way of working is clearly seen from FIG. five; on the left is the usual copying scheme for the copier, and on the right is the reverse. This pointer device may give some inaccuracy in operation, depending on the shape of the copier and the size of the fixture.

The subject matter of the invention.

Adaptation to the electromagnetic mill milling. Keller type for backing up the product in the manufacture of dies or molds, characterized by the use of a contact device for a copier, consisting of several spring-loaded fingers located on the forming mills and pressed to the copier under pressure of the working medium 3, each of which individually with its stops with a recess or a projection of the copier to control the feed of the cutter by deflecting the finger supporting frame 9 to act on the corresponding contacts 0 and / or the usual circuit electric control (Fig. 4).

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