CN213451965U

CN213451965U - Blank after three-piece type ball valve cover forging is rolled and expanded

Info

Publication number: CN213451965U
Application number: CN202022393819.2U
Authority: CN
Inventors: 吴克成; 周亚夫; 杨柳
Original assignee: Sichuan Hongxin Energy Equipment Manufacturing Co ltd
Current assignee: Sichuan Hongxin Energy Equipment Manufacturing Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-06-15
Anticipated expiration: 2030-10-23

Abstract

The utility model provides a blank after three formula ball valve gap forging expands by rolling, wholly be the ring spare, the blank upper end is provided with the ring flange, and the lower extreme is provided with down the ring flange to form the concave ring groove at the lateral wall middle part of blank, the hole of blank comprises from the top down coaxial consecutive first straight hole, big-end-up's bell mouth, the straight hole of second, and the upper end edge of blank is provided with round biconical face step. The end, close to the upper flange plate, of the central through hole of the blank is provided with the taper in the rolling and expanding forming process, and the upper flange plate is provided with the step, so that the cost of blank blanking and the cost of subsequent machining are reduced.

Description

Blank after three-piece type ball valve cover forging is rolled and expanded

Technical Field

The utility model relates to a forging blank especially relates to a blank after three formula ball valve gap forgings expand by rolling.

Background

At present, the rolling forging forming process of a three-piece flange ball valve cover mainly comprises (I) blanking, heating and upsetting; secondly, blank making and continuous skin punching; and (III) a rolling forming process, wherein the inner hole of the blank after blank making and continuous skin punching is a straight hole, the flange plate at the upper end of the rolled blank is a plane, and the inner hole is still the straight hole.

The rolling die consists of a main roller part, a core roller, an upper cone roller of a hole expanding machine and a lower cone roller of the hole expanding machine. The core roller is used for sleeving the blank, and the part of the core roller, which penetrates through the blank, is a cylindrical section. The upper cone roller of the broaching machine and the lower cone roller of the broaching machine are respectively arranged on one side of the axis of the core roller and are used for pressing the upper end surface and the lower end surface of the blank. The main roller part is arranged on the other side of the axis of the core roller and is combined with the core roller to roll the blank, the main roller part comprises a main roller shaft, and a lower cover ring, a spacing ring, a middle ring and a spacing ring which are sequentially coaxially sleeved on the main roller shaft from bottom to top, and are pressed and fixed through a pressing ring; the diameters of the lower cover ring, the middle ring and the upper cover ring are larger than the diameter of the spacer ring, the parts of the upper end surface of the lower cover ring and the lower end surface of the middle ring, which protrude out of the spacer ring, are conical surfaces, the lower end surface of the blank is positioned in the height range of the conical surface of the lower cover ring, and the upper end surface of the blank is positioned outside the pressing ring.

Although the structure of the die is relatively simple, the service life of the rolling die for the valve covers of medium-sized and large-sized three-piece flange ball valves is long, and except for the core rod, the service life of one die is more than 4 thousands of dies, and the height of the die can reach 10 thousands of dies. The service life of the core roller is about 4000, so that the cost difference of the die cost which is spread on each forging blank is very small and can be almost ignored. However, in the forged piece formed by rolling the valve cover of the medium-sized and large-sized three-piece flange ball valve with the conventional design, the flange plate at the upper end has no step, and the end, close to the upper flange plate, of the inner hole has no taper, so that the subsequent machining cost is high, and the material cost of blank blanking is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a blank after saving material, follow-up carrying out the machining with lower cost three-piece formula ball valve gap forging and rolling when blank unloading.

In order to realize the above-mentioned purpose, the utility model provides a blank after three-piece type ball valve gap forging expands, wholly be the ring spare, the blank upper end is provided with the ring flange, and the lower extreme is provided with down the ring flange to form the concave groove at the lateral wall middle part of blank, the hole of blank comprises from the top down coaxial consecutive first straight hole, big-end-up's bell mouth, the straight hole of second, the upper end edge of blank is provided with round biconical surface step, and bell mouth and biconical surface step all are favorable to reducing follow-up machining's cost.

Preferably, the double-conical surface step is composed of an upper conical surface and a lower conical surface, the angle of the upper conical surface is less than or equal to 42 degrees, the angle of the lower conical surface is greater than or equal to 5 degrees, and the angle of the upper conical surface is greater than that of the lower conical surface.

More preferably, the height of the first straight hole, the height of the tapered hole and the height of the second straight hole are 10mm when the first straight hole is the smallest, 65.5mm when the tapered hole is the largest, and the sum of the heights of the first straight hole and the tapered hole when the second straight hole is the largest. The straight hole is only acted by radial force, and the first straight hole formed during rolling can effectively restrain the workpiece from jumping in the rolling process, so that the rolling defect caused by workpiece jumping is avoided.

Preferably, the diameter of the bottom of the groove is larger than the diameter of the first straight hole and smaller than the minimum diameter of the double-conical-surface step, and the diameter of the outer circle of the upper flange plate is larger than that of the outer circle of the lower flange plate.

Further preferably, the lower end face of the lower flange is an arc-shaped face gradually inclined from the inner side to the outer side, the inclination angle is 2.5 degrees, materials in blank blanking are saved, and the cost of subsequent machining is reduced.

The utility model has the advantages that: the end, close to the upper flange plate, of the central through hole of the blank is provided with the taper in the rolling and expanding forming process, and the upper flange plate is provided with the step, so that the cost of blank blanking and the cost of subsequent machining are reduced.

Drawings

Fig. 1 is a diagram of a blank of a conventional three-piece flange ball valve cover formed by roll forging.

Fig. 2 is a rolling die of a conventional three-piece flange ball valve cover.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is a ring rolling die for ring rolling forming of the present invention.

Detailed Description

The blank after the three-piece ball valve cover forging is rolled as shown in fig. 1 is a circular ring piece, an upper flange plate 1 is arranged at the upper end of the blank, and a lower flange plate 2 is arranged at the lower end of the blank, so that a concave ring groove 7 is formed in the middle of the outer side wall of the blank, an inner hole of the blank consists of a first straight hole 3, a conical hole 4 and a second straight hole 5 which are coaxially connected from top to bottom in sequence, a circle of double-conical-surface step 6 is arranged at the edge of the upper end of the blank, and the conical hole 4 and the double-conical-surface step 6 are beneficial to reducing the cost of subsequent machining.

Preferably, the double tapered step 6 is composed of an upper tapered surface 6a and a lower tapered surface 6b, the angle of the upper tapered surface 6a is designed to be less than or equal to 42 °, the angle of the lower tapered surface 6b is designed to be greater than or equal to 5 °, and the angle of the upper tapered surface 6a is greater than the angle of the lower tapered surface 6 b.

Preferably, the height of the first straight hole 3 among the first straight hole 3, the tapered hole 4 and the second straight hole 5 is 10mm as the smallest height, the height of the tapered hole 4 is 65.5mm as the largest height, and the height of the second straight hole 5 is larger than the sum of the heights of the first straight hole 3 and the tapered hole 4. The straight hole is only acted by radial force, and the first straight hole 3 formed during rolling can effectively restrain the workpiece from jumping in the rolling process, so that the rolling defect caused by workpiece jumping is avoided.

Preferably, the diameter of the bottom of the groove 7 is larger than that of the first straight hole 3 and smaller than the minimum diameter of the double-cone step 6, and the excircle diameter of the upper flange plate 1 is larger than that of the lower flange plate 2.

Preferably, the lower end face of the lower flange 2 is an arc-shaped face gradually inclined from the inner side to the outer side, the inclination angle is 2.5 degrees, materials in blank blanking are saved, and the cost of subsequent machining is reduced.

The utility model discloses a roll-expanding forming process as follows:

the method comprises the steps of using a horizontal numerical control broaching machine with an axial rolling function, placing a blank on a workbench of the broaching machine, sleeving a core roller A into an inner hole of the blank, rotating a main roller part D, moving the core roller A, an upper cone roller B of the broaching machine and a lower cone roller C of the broaching machine to the main roller part D simultaneously, moving the upper cone roller B of the broaching machine downwards to a proper position, gradually expanding the inner hole and the outer circle of the blank under the combined action of the core roller A and the main roller part D, ensuring the total height of the blank to be moved downwards by the upper cone roller B of the broaching machine, returning the upper cone roller B of the broaching machine, the lower cone roller C of the broaching machine and the core roller A to the original positions after all sizes and shapes of the blank meet requirements, taking out the blank, and finishing the.

Through the process, one end of the formed central through hole of the blank close to the upper flange plate 1 is provided with a taper, and the upper flange plate is provided with a step, so that the cost of blank blanking and the cost of subsequent machining are reduced.

Claims

1. The utility model provides a blank after three formula ball valve gap forging expands, wholly is the ring spare, the blank upper end is provided with ring flange (1), and the lower extreme is provided with lower ring flange (2) to form concave ring groove (7), its characterized in that in the middle part of the lateral wall of blank: the inner hole of the blank is composed of a first straight hole (3), a tapered hole (4) with a large upper part and a small lower part and a second straight hole (5) which are sequentially and coaxially connected from top to bottom, and a circle of double-conical-surface step (6) is arranged at the edge of the upper end of the blank.

2. The rolled blank of the three-piece ball valve cover forging according to claim 1, wherein: the double-conical-surface step (6) is composed of an upper conical surface (6a) and a lower conical surface (6b), the angle of the upper conical surface (6a) is designed to be smaller than or equal to 42 degrees, the angle of the lower conical surface (6b) is designed to be larger than or equal to 5 degrees, and the angle of the upper conical surface (6a) is larger than that of the lower conical surface (6 b).

3. The rolled blank of the three-piece ball valve cover forging according to claim 1, wherein: the height of the first straight hole (3) in the first straight hole (3), the conical hole (4) and the second straight hole (5) is 10mm, the height of the conical hole (4) is 65.5mm, and the height of the second straight hole (5) is the largest and is greater than the sum of the heights of the first straight hole (3) and the conical hole (4).

4. The rolled blank of the three-piece ball valve cover forging according to claim 1, wherein: the diameter of the bottom of the groove (7) is larger than that of the first straight hole (3) and smaller than the minimum diameter of the double-cone step (6), and the diameter of the outer circle of the upper flange (1) is larger than that of the outer circle of the lower flange (2).

5. The rolled blank of the three-piece ball valve cover forging according to claim 1, wherein: the lower end face of the lower flange plate (2) is an arc-shaped face which gradually inclines from the inner side to the outer side, and the inclination angle is 2.5 degrees.