SU818765A1 - Machine for working holes with helical grooves - Google Patents

Description

one

The invention relates to machine tools and can be used for machining holes, as well as longitudinal and helical grooves in parts such as pipes.

A stem-cutting horizontal machine is known, comprising a frame with a spindle head mounted on its guides, kinematically connected with a reciprocating drive along the longitudinal axis of the machine. In the spindle head, there is a spindle for clamping the cutting tool, equipped with a gear that is in constant engagement with the toothed rack. The latter is mounted on a horizontal spindle of the spindle head, perpendicular to the longitudinal axis of the machine, with the possibility of reciprocating in the horizontal plane perpendicular to the longitudinal axis of the machine, and provided with a finger with a cracker entering the longitudinal horizontal groove of a flat rotary copier. A flatbed copier with the aid of a portal and two brackets is fixed above the bed and can be rotated in a horizontal plane by an angle corresponding to the angle of inclination of the helical groove (thread pitch). For cutting screw grooves of different directions, the portal is made symmetrical, covering the frame on both sides, and is fixed on two frame brackets. The opening in the portal is chosen so that a spindle head with a rack is freely passing under it. The width of the spindle head depends on the length of treatment and on the span of steps covered by the helical grooves 1.

This machine is selected as a prototype.

The disadvantage of the machine is that such an arrangement of the copier and the toothed rack leads to a significant increase in the dimensions of the machine, causing inconvenience in maintenance and adjustment of the machine. The portal itself is very bulky and metal-intensive, since it must provide a certain rigidity.

The purpose of the invention is to reduce the size and provide ease of maintenance.

This goal is achieved by the fact that the rotary copier is mounted on the rear wall of the frame, can be rotated in a vertical plane, the guide on the spindle head is made vertical, and the rack and pinion is mounted on a vertically moveable head of the spindle head.

FIG. 1 shows a general view of the machine; in fig. 2 - section A-A of FIG. one; in fig. 3 - section bb FIG. 2

A spindle head 2 is mounted on the guides of the bed 1, which is connected with the drive 3 of the reciprocating movement. In the case of the spindle head 2 there is a spindle 4, which serves to fasten the tool 5, for example, the spoiler. A gear 6 is rigidly mounted on the spindle 4, which meshes with the gear 7 of the intermediate roller 8. The roller has teeth 9 that are in constant engagement with the rack 10. The latter, in turn, is rigidly mounted on the vertical slider 11 of the spindle head 2 on the rear wall of the frame 1 and can make a reciprocating movement along the vertical. In the lower part of the slider 11, a finger 12 is fixedly mounted with a rusk 13 inserted into the longitudinal groove of a flat rotary copier 14. The copier is mounted on the horizontal axis 15 of the bracket 16 on the rear wall of the frame 1 with the possibility of rotation in a vertical plane relative to the horizontal axis 15. The angle of rotation of the copier 14 is determined depending on the angle of inclination of the helix being machined in the hole. For fastening the copier in the working position, clamps 17. The workpiece is fixedly fixed on the wall by means of a fastening mechanism 18. The spindle 19 and the drive 3 are mounted on the base 1.

The machine works as follows.

To set up the machine, the copier 14 is rotated in a vertical plane relative to the horizontal axis 15 by an angle corresponding to the desired angle of inclination of the screw thread in the hole of the workpiece, and fixed rigidly on the bracket 16 in this position. The part is mounted in a fastening mechanism 18, and during processing it remains stationary. The drive 3 is turned on, and the spindle head 2 begins to move reciprocally along the longitudinal axis of the machine together with the spindle 4, the cutting tool 5, the gear 6 and the slider 11 with the rack 10. The finger 12 with the biscuit 13, the slider of the copier 14 will move the rack 10 in a vertical plane. Thus, the rail makes two movements: one longitudinal with the spindle head 2 from the actuator 3, and the other perpendicular to the first from the copier 14.

Consequently, the spindle 4 with the cutting tool 5 also performs two movements: translational together with the spindle head 2 and rotational from the rack 10 through gears 9, 7 and 6. The ratio between translational and rotational movement should be such that the cutting tool describes a helix step equal to the cutting step in the hole of the workpiece.

The vertical position of the drive spindle 4 makes it very easy to create multi-spindle configurations, for example, a three-spindle machine. For this

all that is required is the formulation of the modules 19 in the form of spindle boxes having only a housing. Similar modules are placed on the feed mechanism 20 and on the fastening mechanism of the part 18.

“The arrangement of a flat-mounted rotary copier with a bracket at the back of the machine bed with the possibility of rotation in the vertical plane has reduced the dimensions of the machine. The proposed arrangement provides great convenience in setting up and maintaining the machine, since there are no moving and protruding parts above the parts to be processed, it increases the safety of the maintenance of the machine; allows Q to appear from a massive metal-intensive portal.

Claims (1)

Invention Formula A machine for machining holes with screw grooves containing a frame, a spindle head with a drive of reciprocating movement, a carrying spindle kinematically connected with a movable gear rack mounted in the guide of the spindle head and interacting through a finger with a copier mounted by means of a brace on the frame, characterized in that, in order to reduce overall dimensions and provide  ease of maintenance, a copier is placed on the rear wall of the frame so that it can be rotated in a vertical plane, and the gear rack is mounted so that it can be moved on the spindle guide Q head located vertically. Sources of information taken into account in the examination 5 1. Arefiev, MG and Karpov, L.I., Production of small-arms barrels, Oborongiz, 1945, p. 130-132, FIG. 130, 131, (prototype).