CN202910274U - Bottle blank capable of forming pipe die blank by large tube reducing - Google Patents

Abstract

A bottle blank capable of forming a pipe die blank by large tube reducing is a big-end-up hollow cone (1) with an opening at upper end. The size of a round hole (2) formed in the center of the cone (1) is same from top to bottom, and the conical degree of the cone (1) is 0.7 degree to 1.6 degrees. The bottle blank is formed to be the pipe die blank through processes of being heated by large tube reducing perforation by a tapered roller, cycle forging rolling by a pipe mill and the like, the pipe die blank is formed to a pipe die through the processes of straightening, rough machining, heat treatment, finish machining and the like, and then the pipe die is installed on a centrifugal pressure casting machine to used for casting iron pipes. According to the bottle blank capable of forming the pipe die blank by the large tube reducing, Pilger heads supposed to be cut in rolling are fully used, use ratio of raw materials is greatly improved, manufacturing costs of the pipe die are low, production efficiency is high, big superiority on the aspects of product safe reliability, a deformation process, compression ratio and pipe die specification coverage area are received, complete pipe die specification coverage is achieved.

Description

A kind of bottle base of large diameter-reducing formation die blank

Technical field

The utility model belongs to pipe die manufacturing technology field, particularly a kind of bottle base of large diameter-reducing formation die blank.

Background technology

At present, utilize the centrifugal casting technology to produce ductile iron pipe and have advantages of that rhythm of production is fast and efficient is high, have extremely vast potential for future development.And pipe die is the large-scale critical component of centrifugal casting machine top casting iron pipe, and environment for use is extremely abominable.Pipe die is under the High Rotation Speed state, and molten iron applies on the pipe die inwall because of centrifugal action in the cast, and the pipe die inner wall temperature is sharply raise, and outer surface by circulating water to reduce temperature.Pipe die bears the composite conditions such as alternating thermal stress, tensile stress and distorting stress for a long time, therefore high to the pipe die quality requirement, pipe die is 21CrMo10 with the trade mark commonly used of pipe.

The specification limit that pipe die is commonly used is DN80 ~ DN1200, and female end D outer diameter maximum reaches 1569mm.According to different specifications, its processing technology is also different with method: 1) for the pipe die of specification less than DN 200, blank adopts solid forging, and the process of deep hole drilling, bore hole is adopted in machined; 2) for the pipe die of specification in DN 200 ~ DN 500 scopes, the blank solid forging, the process of employing jacking, bore hole, the core material of extracting can be used as the blank of a little specification pipe die, has realized the secondary utilization; 3) for the pipe die of specification greater than DN 500, adopt hollow forging, process at high efficiency deep hole building-block machine, realize clamped one time, located the whole body processing of finishing the positions such as pipe die endoporus, cylindrical, improved production efficiency.

Existing pipe die manufacturing process mainly has the following disadvantages:

(1) existing pipe die adopts solid or hollow forging deep hole machining mode is made, although adopted jacking technique to improve utilization rate of raw materials in the manufacturing of Large Diameter Pipeline pipe die, material wastage rate is generally about 40%.

The problems such as (2) have the pipe die manufacturing now and have not easy-formation of pipe die female end, need the extra manufacturing of adopting the techniques such as thickening, expander to finish pipe die trumpet type female end, just there is complex process in this so that have the pipe die manufacturing process now, and the manufacturing cycle is partially long.

(3) adopt the continuous casting billet pilger mill to produce die blank, Pierre's wresting of self-assembling formation, be that horn mouth (pipe die female end) is not through cycle forging and pressing roll forming, have with forging stock close compression ratio (rolling ratio) the same as other parts can not be guaranteed, the raw-material performance of this part of pipe die can not be guaranteed.And female end connects with driving belt during centrifugal casting, drives the pipe die High Rotation Speed, and applying working condition is the most abominable, has larger potential safety hazard; Before the heavy caliber continuous casting circular tube blank feeds intake, must carry out rough bore processing to the pipe endoporus, increase loss (approximately 5%) and the Boring cost of material; Be subjected to the restriction of continuous casting billet specification, also have the narrow problem of die blank production range.

Summary of the invention

The purpose of this utility model is the above-mentioned deficiency that overcomes prior art, and the bottle base of the large diameter-reducing formation die blank that a kind of utilization rate of raw materials is high, with short production cycle, cost is low is provided.

The technical solution of the utility model is: a kind of bottle base of large diameter-reducing formation die blank, be the hollow cone body of upper end open, and cone is up big and down small taper shape.

The further technical scheme of the utility model is: the tapering of cone is 0.7 ° ~ 1.6 °.

The utility model adopts upper end open, up big and down small hollow cone body structure, in conjunction with large reducing process shaping die blank, can giving full play to steel ingot, to have a cost low, less energy consumption, the lumber recovery high, can be effectively in conjunction with the large tube reducing perforation of tapered roller, the technology such as pilger mill forging rolling, not only can guarantee that die blank integral body has the performance close with forging, can take full advantage of again simultaneously the Pierre's wresting that should excise when rolling, increase substantially raw-material utilization rate, the pipe die low cost of manufacture, production efficiency is high, in the product safety reliability, deformation technique, there is greater advantage compression ratio (particularly female end) and pipe die specification coverage aspect, have substantially realized all standing of pipe die specification.

Below in conjunction with the drawings and specific embodiments detailed content of the present utility model is further described.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the schematic diagram of punching when beginning;

Fig. 3 is the schematic diagram after punching finishes.

The specific embodiment

As shown in Figure 1: a kind of bottle base of large diameter-reducing formation die blank, be upper end open, up big and down small hollow cone body 1, the circular hole at cone 1 center in the same size about in the of 2, the tapering of cone 1 is 0.7 ° ~ 1.6 °.

The course of work of the present utility model is: with steel ingot 3 after annular furnace heating, place hydraulic pressure perforating press inner membrance (inner membrance is the hollow circular cylinder 4 of upper end open by shown in Figure 2, the circular hole 5 at hollow circular cylinder 4 centers is up big and down small, tapering is 0.7 ° ~ 1.6 ° bellmouths), with drift 6 steel ingot 3 is washed into the utility model bottle base by shown in Figure 3 again, through the large tube reducing perforation of tapered roller, the techniques such as pilger mill forging rolling are made die blank, again die blank is aligned, thick machined, heat treatment, the techniques such as fine finishining are made pipe die, are installed in to be used for watering cast iron pipe on the centrifugal casting machine.

Claims (2)

1. the bottle base of a large diameter-reducing formation die blank is characterized in that the hollow cone body for upper end open, and cone is up big and down small taper shape.

2. the bottle base of large diameter-reducing formation die blank according to claim 1, the tapering that it is characterized in that cone is 0.7 ° ~ 1.6 °.

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