SU1366331A1 - Chuck for cutting thread - Google Patents

Abstract

The invention relates to the field of metal cutting and can be used for threading taps, dies on aggregate machines and in automatic lines. The purpose of the invention, the reduction of dimensions, is achieved by reducing the radial dimensions of the elastic elements centering the toolholder. In the housing 1 of the cartridge, the tool holder 3 is spring-loaded in the axial direction by the spring 4. The centering of the tool holder 3 in the radial direction is provided by elastic elements that are completely in the form of a sleeve 11 with spring petals 13, each of which interacts with balls 10, . Filed in the holes 9 of the housing 1. 2 Il.

Description

00

at)

9e

: s; o

11366331

The invention relates to the processing

metal cutting and can be used for threading taps, dies on aggregate machines and in automatic lines.

The purpose of the invention is to reduce the size by reducing the radial dimensions of the elastic elements centering the tool holder.

FIG. 1 shows the cartridge, a section in FIG. 2 - the same, side view.

The cartridge consists of a housing 1, in which a tool holder 3 is placed with a gap in the hole 2. The tool holder 3 is spring-loaded in the axial direction by a spring 4.

The chuck body 2 has a window 5 for moving the driver lead 6 of the holder 3. The window 5 is figured and has a protrusion 7 that acts as a stop for the driver. 6 when the tap 8 is inserted.

The housing 1 has two rows of radially arranged holes 9 in which the balls 10 are installed. The tool holder 3 is radially centered by elastic elements, which are made in the form of a sleeve 11 with slots 12 at the ends with the formation of spring-loaded petals. 13, each of which interacts with the balls 10.

To prevent falling into

cartridge shavings, grease, etc. on the box there are 35 threads, especially in parts of

Pus 1 Wear Rubber Cover 14.

The length of the springs 4 is chosen such that the lead 6 of the tool holder 3 is located in the window 5 in an intermediate position between the projections 7 and the surface 15 of the window 5.

The cartridge works as follows.

The torque from case 1 is transmitted through the driver 6 to the tool holder 3 with a tap 8. The driver 6 during rotation presses against the plane 16 of the window 5 and as it touches the surface of the part or the side surface of the hole being cut, it begins to move in the axial direction until into the projection is an emphasis 7. From this moment the plunging of the tap 8 begins, and since the feeding of the body 1 of the chuck lags behind the feeding of the tap 8, the lead 6 of the tool holder 3 moves away from the protrusion 7 of the window 5, i.e. Threading occurs by self-engaging the tap 8 without affecting the unevenness of the spindle feed.

Claims (1)

light alloys, such as aluminum Formula invented A threading chuck, in the case of which has a longitudinal groove and apertures, is installed an axle-mounted tool holder with a leash, axially, with a lead, 45 times to interact with the groove, while the toolholder is radially circumscribed with an element that differs from in order to simplify the structure, the cartridge is equipped with spherical bodies installed in the openings of the housing with the possibility of interaction with the tool holder, while the other element is a sleeve mounted on the case, on which made longitudinal with the formation of elastic lobes designed to interact with spherical bodies. 50 55 After threading and reversing the rotation of the tap 8, the leash 6 presses against the plane 17 of the window 5 and the tap 8 is freely unscrewed from the cut hole. In this case, the lead 6 of the tool holder 3 can move along the plane 17 beyond the surface of the protrusion 7 due to the presence of backlashes in the kinematic feed chain. When the taper is inserted, the tuck holder 3 is installed along the drilled hole due to the presence of a gap between the tool holder 3 and the hole 2 of the body 1 of the cartridge. Due to the fact that the stop, interacting with the Lead 6, dampens the cutting force and minimizes the impact of the spring 4 on the turns of the thread being cut when tapping and unscrewing the tap, it is possible to use the spring 4 in the cartridge with less force. The use of a spring with a slight axial force and the configuration of the window 5, which allows the driver 6 of the tool holder 3 to move freely along the axis of the stop along the plane 17, prevent the first turn of the cut thread from rolling when the tap is unscrewed. Due to these technical properties, the accuracy of cutting is increased. light alloys, such as aluminum. Invention Formula A threading chuck, in the case of which, having a longitudinal groove and apertures, is installed a spring-loaded B axially toolholder with a leash, intended to interact with the groove, while the toolholder is radially centered in an elastic element, characterized in that in order to simplify the construction, the cartridge is provided with spherical bodies mounted in the openings of the housing with the possibility of interaction with the tool holder, while the elastic element is nnuyu on the housing sleeve, the ends of which are made longitudinal slots to form elastic tabs intended to interact with spherical bodies. 0 five FI.2