CN105499942A - Preparation method for combined steel cores in tee fitting mould - Google Patents

Abstract

A preparation method for combined steel cores in a tee fitting mould belongs to the technical field of mould processing. The junction surfaces dislocation phenomenon can be eliminated by the preparation method disclosed by the invention, so that processing precision and processing efficiency are increased. The preparation method comprises the following steps: I, blanking, turning two end faces and a stepped excircle, and making an allowance; II, milling an excircle of a big end into a square to be served as a processing datum; III, processing locating pin holes perpendicularly to an axial direction in horizontal and vertical directions of the big end; IV, cutting a part into four sections by using a linear cutting method, cutting a 45-degree junction surface of a small end, and making an allowance; V, inserting locating pins into the locating pin holes to enable the four sections to be combined together, and performing spot welding for fixation on the two end faces; VI, turning excircles of the big end and the small end of the part; VII, processing a profile at a bend position of the small end in a numerical control milling manner, and cutting the 45-degree junction surface of the small end by using the linear cutting method; VIII, performing polishing treatment, opening a welding spot of a big end face, and taking out the locating pins to finish processing.

Description

The preparation method of steel core is combined in a kind of tee pipe coupling mould

Technical field

The invention belongs to mold machining technology field, particularly relate to the preparation method combining steel core in a kind of tee pipe coupling mould.

Background technology

Tee pipe coupling mould is a kind of more common mould, and its structure as shown in Figure 1 and Figure 2, is made up of upper die and lower die, lining, the first combination steel core, the second combination steel core and alignment pin.In a mold in order to the needs of wax part depanning, steel core is often made up of many pieces, so be called combination steel core; The structure of combination steel core, as shown in Fig. 3 ~ Fig. 5, is often organized steel core and is made up of four pieces, be respectively the first piece, the second piece, the 3rd piece and the 4th piece.The feature of these pieces is: each piece is very thin, adds not easily clamping and very easily produce distortion in man-hour.And requiring that the die cavity precision formed reaches 0.05mm after final piece assembling, must not misplace between each piece and fit clearance must not be greater than 0.03mm, can not there is dislocation and the not round and smooth phenomenon of profile in all blade profile loose piece combinations later.

At present, the preparation method of existing combination steel core is: each piece processes all separately whole profile, then assembles.The weak point of this preparation method is: due to mismachining tolerance (within equipment mismachining tolerance 0.03mm) add part thin and produce distortion (different from about 0.05 ~ 0.1mm because of different part), and four pieces add man-hour each piece and there is the situation of distortion, each like this loose piece because accumulated error will exist the inconsistent phenomenon of profile, can affect the profile precision of part when assembling when pincers worker is revised by hand.Error between multiple piece superposes mutually and causes the forming errors often organizing steel core at about 0.1 ~ 0.2mm, can not meet design requirement.

Summary of the invention

For prior art Problems existing, the invention provides one and can eliminate composition surface inconsistent phenomenon, improve the preparation method combining steel core in the combination overall processing precision of steel core and the tee pipe coupling mould of working (machining) efficiency.

To achieve these goals, the present invention adopts following technical scheme, combines the preparation method of steel core, comprise the steps: in a kind of tee pipe coupling mould

Step one: blanking, car both ends of the surface and ladder cylindrical, and leave surplus;

Step 2: the peripheral milling held greatly is processed into square, as machining benchmark;

Step 3: at level and the vertical direction locating and machining pin-and-hole perpendicular to axial direction of large end;

Step 4: the part after step 3 being processed with wire cutting method cuts into four pieces of pieces by designing requirement, and cuts small end 45 degree of faying faces, and leaves surplus;

Step 5: by the dowel hole of processing in alignment pin inserting step three, four pieces of pieces are combined, and fixes in both ends of the surface spot welding;

Step 6: carry out Combined machining, by the large end cylindrical of designing requirement car part and small end cylindrical;

Step 7: NC Milling small end elbow profile, and cut small end 45 degree of faying faces with wire cutting method;

Step 8: polishing, opens the solder joint of large end face, takes out alignment pin, completes processing.

Beneficial effect of the present invention:

1, the present invention can reduce the machining deformation of piece, and the overall profile brought due to the accumulation of error when avoiding single-piece work is overproof, can eliminate composition surface inconsistent phenomenon, improve the overall processing precision of combination steel core;

2, can process owing to combining rear each profile, so the working (machining) efficiency of combination steel core significantly can be improved simultaneously.

Accompanying drawing explanation

Fig. 1 is the structural representation of tee pipe coupling mould;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the structural representation of the first combination steel core in Fig. 1;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is the B-B sectional view of Fig. 4;

Fig. 6 is the part drawing in embodiment 1 after step one is processed;

Fig. 7 is the right view of Fig. 6;

Fig. 8 is the part drawing in embodiment 1 after step 2 processing;

Fig. 9 is the right view of Fig. 8;

Figure 10 is the part drawing in embodiment 1 after step 3 processing;

Figure 11 is the top view of Figure 10;

Figure 12 is the right view of Figure 10;

Figure 13 is the part drawing in embodiment 1 after step 4 processing;

Figure 14 is the top view of Figure 13;

Figure 15 is the right view of Figure 13;

Figure 16 is the part drawing in embodiment 1 after step 5 processing;

Figure 17 is the upward view of Figure 16;

Figure 18 is the left view of Figure 16;

Figure 19 is the part drawing in embodiment 1 after step 6 processing;

Figure 20 is the part drawing in embodiment 1 after step 7 processing;

In figure: 1-counterdie, 2-patrix, the 3-the first combination steel core, 4-the second combination steel core, 5-alignment pin, 6-lining, 7-the first piece, the 8-the second piece, the 9-the three piece, 10-the four piece, 11-dowel hole, 12-cutting track E, 13-cutting track F, 14-cutting track M, 15-cutting track N, 16-seven place's solder joints, 17-cutting track D, 18-45 degree faying faces.

Detailed description of the invention

Below for one group of combination steel core, the present invention is described in further detail by reference to the accompanying drawings.

Embodiment 1

Combine a preparation method for steel core in tee pipe coupling mould, comprise the steps:

Step one: lower 40Cr bar, is of a size of Φ 70X160, with general horizontal lathe CA6140 car both ends of the surface and ladder cylindrical, and leaves surplus, car small end to Φ 42 size, both ends of the surface car to size 155.5, as shown in Figure 6, Figure 7;

Step 2: the peripheral milling held greatly is processed into square with ordinary vertical milling machine, as machining benchmark, is of a size of 48*48, mill 0.2 ~ 0.3mm is stayed on every limit, then with common plain grinding mill 48 ± 0.02X48 ± 0.02X155 six, ∥ ⊥ 0.02mm is ensured, as shown in Figure 8, Figure 9;

Step 3: respectively process two dowel holes 11, as shown in Figure 10 ~ Figure 12 in the level of holding greatly and vertical direction precision jig boring machine perpendicular to axial direction;

Step 4: the part after step 3 being processed with wire cutting method cuts into four pieces of pieces by designing requirement, be specially: first along cutting track E12 corner cut, then cut the 4th piece 10 along cutting track F13, finally cut the first piece 7, second piece 8, the 3rd piece 9 along cutting track M14 and cutting track N15 respectively; Cutting small end 45 degree of faying faces, and leave surplus, as shown in Figure 13 ~ Figure 15;

Step 5: by the dowel hole 11 of processing in alignment pin inserting step three, four pieces of pieces are combined, ensure that faying face is closely sealed, and each piece spot welding fixed in both ends of the surface K, S face, equating, as shown in Figure 16 ~ Figure 18;

Step 6: carry out Combined machining, by the large end cylindrical of designing requirement car part and small end cylindrical, large end car to Φ 37 size, small end car to Φ 31.59 size, as shown in figure 19;

Step 7: by Five Axis NC Milling small end elbow profile, and cut small end 45 degree of faying faces 18 with wire cutting method along cutting track D17, as shown in figure 20;

Step 8: after polishing is carried out in pincers worker, opens the solder joint in large end face K face with emery wheel, take out alignment pin, complete processing.

By above-described embodiment 1, reach following effect:

1), by the precision controlling of detection components within 0.05mm, nearly 4 times of machining accuracy is improved;

2), working (machining) efficiency entirety improves 2 ~ 3 times.

Claims (1)

1. combine a preparation method for steel core in tee pipe coupling mould, it is characterized in that, comprise the steps:

Step one: blanking, car both ends of the surface and ladder cylindrical, and leave surplus;

Step 2: the peripheral milling held greatly is processed into square, as machining benchmark;

Step 3: at level and the vertical direction locating and machining pin-and-hole perpendicular to axial direction of large end;

Step 4: the part after step 3 being processed with wire cutting method cuts into four pieces of pieces by designing requirement, and cuts small end 45 degree of faying faces, and leaves surplus;

Step 5: by the dowel hole of processing in alignment pin inserting step three, four pieces of pieces are combined, and fixes in both ends of the surface spot welding;

Step 6: carry out Combined machining, by the large end cylindrical of designing requirement car part and small end cylindrical;

Step 7: NC Milling small end elbow profile, and cut small end 45 degree of faying faces with wire cutting method;

Step 8: polishing, opens the solder joint of large end face, takes out alignment pin, completes processing.