SU648304A1 - Method and apparatus for making helices of worm screw - Google Patents

Description

(54) METHOD OF MANUFACTURING SPIRALS OF AUGER AND DEVICE FOR IMPLEMENTING THE METHOD where the diameter of the helix in sections ti t is the helix pitch. Such a method can be implemented in the right direction, in which the deformity. working workers are built in the form of an anvil with a profiled working surface, and a profiled striker with a drive installed with CO; the anvil is anchored, and the device is equipped with a winding mechanism mounted behind the forming element and spring-loaded comb, calibrating the sprint according to the step. FIG. Figure 1 shows schematically the longitudinal sections of the turns of the spirals: a - straight, b oblique, c - one of the variants of the cross section of the spiral curve in FIG. 2 — cross-sectional shapes of deformed billets of the spirals: a — straight, b — oblique, c — curve; in fig. 3 a device for making spirals of augers. Dashed lines I - 1O in FIG. 1 and 2 show the corresponding equality of the thickness of the deformed blanks of various spirals. The thickness of the reformed billet in any section of the cross-section is defined. It is the formula where 5 is the required thickness of the deformed billet in the cross section of the raw material, the initial thickness of the billet G t4n is the length of the helix along the internal diameter of the helix, with the maximum thickness of the helix; C | - for the helix of the diameter Df, the spiral is three the required thickness of the helix Cj, T / (1t,) 2 + i where Dfi is the diameter of the helix in section Ui i is the pitch of the helix. The table at the end of the description contains data for constructing a cross section of the deformed billet helix billet. Based on the data in the table (second and fifth spikes), the cross sections of the deformed blanks for various spirals are constructed (see table and figures 1 and 2). From the construction it is seen that the exact cross-sectional shape of the deframed blanks is wedge-shaped , double-edged The device for making spirals of the screw consists of feed rolls I, strip 2 and guides 3 and 4 of nakrveshny 5, striker 6, forming device 7 of strip 2 into spiral 8, devices for winding spiral onto screw shaft 9 which, in turn, consists from the shaft support 1O, the shaft drive into rotational movement in the form of a coupling II,. at the same time, the second shaft support, an actuating fork 12, mounted on a slider 13, calibrating the helix along the spring (not shown) of the comb 14, on which the rollers 16 are put on the dusty 15. The helix manufacturing device works as follows. The feed rolls 1 feed the strip 2 along the guides 3 and 4 onto the anvil 5. The striker 6, moving reciprocatingly, deforms the strip. The device 7 molds the deformed strip into the finished helix 8. The helix, having made a vertical-translational movement, is wound on the screw shaft 9 rotating in the same direction as the helix. After the strip leaves the feed rolls, another ndnoc y is pushed into the device, which pushes the first one through the deformation and forming zones. The remainder of the helix, after it exits the molding device, is wound onto the rotating shaft by moving the calibrating comb to the left, after which the shaft with the helix is removed and another shaft is placed. An example of the method. It is required to make a straight helix with the following parameters: outer diameter DH 250 mm, inner diameter d in mm, pitch t 250 mm, number of turns 2 10 pcs, thickness of the workpiece j 20 mm. The width of the workpiece is taken from the attached table and is equal to 95 mm. Taking into account the fact that the width of the workpiece during deformation will increase, that the undesired HOj should reduce the width of the workpiece in advance. Accepted mm (at the factory Rostselmash on the helix spiral take the width of the workpiece equal to 92 93 mm). With the help of the same table, the length of the workpiece is defined. Z 313-10 313О mm

Selected blank 2 (see Fig. 3) | supplied by rollers 1, along guides 3 and 4 to the deformation zone, is calibrated with profiled working elements 5 and 6 (vapas or striker and anvil) to obtain specific sections in its cross section, the values of which are indicated in column 5 (see table and fig . 2, a). At the exit from the deformation zone, a calibrated billet is molded into a finished helix 8 with the help of a device 7, made in the form of three horses of rolls, whose large diameters roll around the peripheral side of the helix.

To make a straight helix of the same pitch and with the same number of turns, but with an outer diameter of DH 22 O mm and an inner diameter of 80 mm, one should choose the thickness of the workpiece using the same table. For this, the thickness of the workpiece, corresponding to an inner diameter of 8 mm, is rounded to the nearest one, i.e. dmax. It should be noted that a given helix can also be obtained from a billet with a thickness of 20 mm, but it is impractical to introduce the fact that the deforming working elements receive an additional load, as a result of which the quality of the helix decreases.

A table for constructing a deformed cross section

Then, using the same table, the length of the workpiece is determined.

L С - Z 354.4-10 3544mm

Taking into account the fact that the thickness of the workpiece is chosen to be greater, the length of the workpiece is met. The specified length L ,, is equal to

- iiHiHii 3477mAL

H

eight

max

The width of the workpiece is

 DHdg, and y -2 -2 --- 70AW.

15

With the amendment, as in the first case, the width is assumed to be 69 mm.

All operations are performed in the same sequence, by the same operating elements. If we assume that, in the first case, the width of the workpiece is equal to the width of the deforming working elements, then in the second case, the width of the workpiece is their width. At the same time, it is not possible to shift the deformable workpiece to the upper or lower edge of the deforming working elements, since the necessary correspondence of the specific values of the cross-section of the calibrated workpiece and the length of the coil will not be achieved (see tab. 4 and 5).

Claims (3)

Formula of rete n and I. A method for making iiiBefea vyu pbyty coils. or strips in which aagotech is deformed by working shements with its sheave pressed (Clicking double molds into a spiral auger, characterized in that, with a chain of puffs with spirals of increased accuracy and potential, and from curvature of the shape of the curved surfacing pattern, which is used to create a spiral pattern, it is imperative to use the same pattern, which is used to create a spiral pattern, which is used to create a spiral pattern, which is shaped by the shape of the curved pattern, which is used in the shape of the spiral pattern, which is used to create a spiral pattern, which is used to create a spiral pattern, which is used to create a spiral pattern that is in shape, which is shaped like a pattern, and it is used to create a spiral pattern that is used to create a spiral pattern that is used to create a spiral pattern that is in shape, which is shaped by the shape of the spiral pattern, and is used to create a line pattern, which is used to create an irregular shape. , when receiving half-finished billet on top of spiral helix adjacent to defor (the yarukyy vlemevts, are impacted, and the deformity is thickened ({the billet in any call on the line: of formula  SfpffK-Cmin. Llaa where $ 1 is the desired thickness of the deformed yoke in sechevia h; max - to the thickness of the workpiece; Dive in vivtovaya Libya in the ancient diameter of the spiral, with a maximum thickness of the spiral; Cf is the length of the helix over the diameter of 1 helix, with the required helix thickness С T / dro i .г. where Df, is the diameter of the helix in Sich and; t is the pitch of the helix 2. A device for carrying out the method according to claim I, comprising deforming work elements and forming elements, T and often so that the deforming work elements are made in the form of anvil with profiled working surface and profiled striker with a drive, fitted coaxially with the anvil. 3. The device according to claim 2, d tl and chayu e with the fact that it is equipped with a winding mechanism, authorized for the forming element, and a spring-loaded comb, calibrating the helix in a step. Sources of information that are taken into account in the examination 1, USSR Copyright Certificate No. 422972. cl. B 21 13 11 / O6, 25.04.72. 2. For registration No. 2174885/27, according to which the decision to issue an author's certificate was made: cl. At 21 B 11/06, O4.07.75. city / WITH