SU1349113A1 - Cutting plate for cutting internal thread - Google Patents

Abstract

The invention relates to metal working, namely a tool for threading. The purpose of the invention is to improve the accuracy of thread cutting. The plate is a prismatic shaped body with an even number of edges, two bases 1, on which there are chip grooves 10. At the intersection of the faces with the bases 1 there are 13, 14 cutting and supporting 16, 18, 19 teeth. All teeth are arranged in opposite pairs. On opposite faces, the cutting teeth 13 and 14 are offset relative to each other by half a step of the threaded profile. The sides and cuts of the tops of the teeth lie on the forming helicoid, and the base on the cylindrical screw surface. 6 Il. 00 4 CO

Description

113

The invention relates to metal working, namely a tool for threading.

The purpose of the invention is to increase the accuracy of thread cutting due to the possibility of compensating the radial forces and imparting stability to the plate due to the presence of support teeth.

H FIG. 1 shows a cutting plate for threading, a general view; in fig. 2 is a section A-A in FIG. in fig. 3 is a section BB in FIG. one; in fig. 4 shows the layout of the cutting and abutment teeth; in fig. 5 - surfaces connecting the bases, sides and cuts of the tops of the threaded profile of the cutting and supporting teeth located on one of the faces of the plate; in fig. 6 is a diagram for calculating the amount of displacement of a 6 truncated cone for the abutment teeth relative to the Koiryca for the cutting teeth.

The cutting plate is a prismatic body with an even number of edges, two bases 1 and 2, on which there are a hole 3 for

plate fasteners and chip grooves 4-11. At the intersection of the faces with

the bases are located cutting

tooth 12-15 and basic teeth 16-19.

On the opposite edges of the cutting

and supporting teeth are located dia-

This is opposite (Figs. 1-3).

The cutting teeth 12-15 are made in the form of a threaded profile, which consists of the base K, lateral sides 20 and 21, and cuts of the tops 22. Identically cutting teeth m have support teeth 16-19 with the base K, lateral sides of 23 and 2ft, and cuts of the tops 25 Sections of the opposite cutting teeth 12-15 are located on the truncated cone forming 26, and the teeth themselves are offset relative to each other by half of the K / 2 profile base (Fig. A). On each face, the threaded profiles of the cutting 12–15 and supporting 16–19 teeth are identical between each other on the lateral sides 20–24 and sections of the vertices 22, 25 by the helicoid surface: on the lateral sides by surfaces 27 and 28, and on the lateral sides by surface 29. The bases of the cutting and abutment teeth are connected by a helical cylindrical surface 30. The pitch of these surfaces is equal to the base of profile K (Fig. 4.5).

32

Since for each face, the cutting 12-IS and the supporting 16-19 teeth are identical and they are connected by spiral surfaces of the same pitch, sections of the tops of the supporting teeth 16-19 are also located on the forming 31 frustoconical taper-like cones, on the Forming 26 of which there are cuttings of the tops of the cutting 12-13 teeth, but displaced along the axis 32 by the value S, which depends on the width of the plate H (Fig. 4, 5). The magnitude of the offset S is determined from the circuit in FIG. 6, where T DO, is the circumference of the unfolded diameter of the base of the cone, another leg Lr of the polygon corresponds to the size of the base of the profile, then the hypotenuse of the triangle corresponds to the position of the helicoid surfaces and the helical cylindrical surface whose pitch is equal to the base of the profile K. which is equal to the part of the length of the circle SDO corresponding to the width of the plate H .. The value of S is determined from the dependence

± 5-, | and. , 1.,, k o DOH

during operation, the cutting teeth 12-15, when the plate rotates relative to the longitudinal axis 32, form a thread with a step K due to the fact that the opposite teeth are displaced relative to each other by half of the base of the K / 2 profile, the supporting teeth 16-19 are displaced relative to the cutting element F, and the cutting teeth with the supporting teeth are connected by surfaces whose pitch is equal to the base of the K profile,

Claims (1)

Invention Formula I, A cutting plate for cutting internal thread with an even number of edges, on two adjacent of which cutting teeth are made, including the base, sides and cut tops with chip grooves, characterized in that, in order to improve the accuracy of thread cutting, on the remaining edges, cutting teeth are made, and on opposite faces of the cutting teeth are offset relative to each other by half a pitch of the threaded profile, and the tooth is wider are located on the cone-forming elements, swept away relative to the plate ends, while the sides and cuts of the tips of the teeth lie on the forming helicoid, and the bases are on a cylindrical helical surface, and the tooth is placed in opposite pairs. and 18 fff 1ft sixteen G6 13 YU 13 11 H P A Fib.G 12 Ig.G V - 6 7 15 13 11 (pus.3 20 22 21 f V 2325 2ft 31 . tf 28 27 Fi9. five Editor L.Narodna Compiled by V.Slntkop Tehrel L.Oliynyk Order 2560 Circulation 5-2 Subscription VNIIPI of the USSR State Committee for the Purposes of Applications and Discoveries 113035, Moscow, Zh-35, Raushsk nab., D. A / 5 Producing factory, Uzhgorod, Proektna str., 4 fie. 6 Proofreader M.Maksimishinets