CN85100360A - Double forming forging for angle milling cutter blank - Google Patents

Abstract

Double forming forging for angle milling cutter blank.

The present invention is a kind of forging method of finger cutter blank, two of the middle part one-shot formings of employing clamp card pressed compact material.It is good to have quality than original forging method cylindrical, awl-cylindricality blank, advantage such as handling safety, easy, saving of labor, material-saving.

Description

Double forming forging for angle casting cutter blank

The invention belongs to a kind of method of efficient forging finger cutter blank.

Finger type milling cutter is to be specifically designed to the cutter that adds work gear.Blade is an involute shape.The forging of finger cutter blank belongs to high-speed steel and forges.Because high-speed steel plasticity is poor, resistance of deformation is big, bring difficulty for the shaping of milling cutter blank, generally all blank is swaged into the garden cylindricality, this blank needs through 3～4 honest thick and pullings.But still there is the heavier shortcoming of blank center segregation.So cutter blade quality is good inadequately, the utilization rate of material is also very low, generally has only 40～50%, if with milling cutter blank Duan Cheng Cone-cylindricality,, improved stock utilization though improved the blade quality, but the operating technology complexity, production efficiency is low, and operation also has certain danger.

The present invention adopts double forming forging for angle milling cutter blank, and the problems referred to above are resolved.

The present invention is with the middle part of clamp card pressed compact material, simultaneously the rough forge spare of two milling cutter blanks of moulding symmetrically.Clamp is made up of half garden cylindricality slips in a pair.Its principle: when blank is lower than conventional high-speed steel final forging temperature slightly (about 850 ℃), withclamp 2 card pressed compact material 1(Fig. 1), side hammer hitsclamp 2, limit rotation blank 1.When cross section, blank 1 middle part reduced, material flowed vertically because blank is axially unfettered, so axially, the radial deformation rule is approximately Li+1/Li=(Di/Di+1)²(Li, Li+1 and Di, Di+1 are respectively i, length and diameter after (i+1) inferior card is pressed).Therefore, the card splenium divides the bus of blank to be approximately conic section, and the conic section root is near the involute of gear.When symmetrical involuteshape clamp 3 cards are pressed in using instead (Fig. 2), blank takes off top clamp then then by preliminary shaping, withhot knife 3 with blank 1 cut in half in the centre (Fig. 3).The rough forge spare of two finger cutters of moulding symmetrically then.When reheating this rough forge spare to 900～950 ℃ again, put into precision forging die moulding (Fig. 4), become the blank (Fig. 5) of milling cutter eventually.Because the temperature of blank was lower than 900 ℃ when card was pressed, the distortion of materials drag is big, at this moment carries out bigger distortion again, will more effectively smash network cementite, and make Impurity Distribution even.Again because of hammering concentrates on the middle part, though the blank surface temperature is lower, because of material always is in the three-dimensional compressive stress state, so can not ftracture because of the plasticity difference of material; Though the centre is to receive action of pulling stress, the centre temperature is higher can not to ftracture yet.The blank middle part is in card pressure process, and vary in diameter is big, and two kinds of clamps that should adopt garden arc radius size not wait successively block pressure.The diameter of big clamp garden arc radius and milling cutter garden post part is close; The garden arc radius of little clamp is about 0.7 times of big clamp garden arc radius.The milling cutter that specification is close can use the clamp of specification of the same race.

The present invention improves nearly two times than original forging method production efficiency, and easy and simple to handle, safety, and cutter blade crystal grain is trickle, and impurity particle is tiny, is evenly distributed.

Description of drawings:

Fig. 1. 1, blank 2, clamp

Fig. 2. 1, blank 2, the symmetry involute

3, interior symmetrical involute shape clamp

Fig. 3. 1, blank 2, interior symmetrical involuteshape clamp 3, hot knife

Fig. 4. 1, finish forgemould 2, involute cavity

Fig. 5. 1, milling cutter blank 2, flank profil involute

Embodiment:

On the 560kg pneumatic hammer, forge the milling cutter blank (see figure 5) of M=20 millimeter

1. calculate the weight (two blankings together) of milling cutter blank.

According to a conventional method with blank heating to initial forging temperature (1150 ℃), through suitably coming out of the stove after the insulation.

3. on hammer, carry out 1～2 time and earnestly pull out, blank is swaged into φ 75 * 150.

4. when blank 1 temperature is reduced to 850 ℃ of left and right sides, be placed on 2 cards of big clamp immediately and press (Fig. 1) (75～80 millimeters of big clamp internal diameter φ, wide about 50 millimeters, gap between two slips is 20～30 millimeters), side hammer hits clamp, limit rotation blank, hammering will gently be wanted soon, and clamp will remain on the middle part all the time.

5. using the lesser calorie subcard when big clamp gap is 0 instead presses.The sub-internal diameter of lesser calorie is about 50～55 millimeters, 50 millimeters of width, and the gap is about 20～25 millimeters.

6. symmetricalinvolute shape clamp 3 cards press (Fig. 2) when the blank mid diameter is about 23～24 millimeters of φ in little clamp is used instead by Yan Houzai, take off top clamp.

7. be pad withlower clip 2, with hot knife 3 (see figure 3) of cutting in half at the middle part of blank 1.

8. according to a conventional method the blank that cuts off is heated to 900～950 ℃ again, is placed on (Fig. 4) in the finish forge mould and forges as shown in Figure 5 milling cutter blank.

Revisal 85100360

After the preceding revisal of the capable revisal of file name page or leaf

Claims 13 two of two moulding simultaneously that are shaped simultaneously

16 pairs of two moulding of the forging that is shaped are forged

11 pairs of forming process double formings of specification digest

Claims (3)

1, a kind of forging method of finger cutter blank, comprise blanking, heating, base, card pressure, cut-out and finish forge operation, it is characterized in that the middle part with clamp card pressed compact material, it is the gabarit shape of rough forge spare that card is pressed the impression that forms, the rough forge spare of two the finger cutter blanks that can be shaped simultaneously symmetrically.

2,, it is characterized in that will block the milling cutter blank that press forging causes shape to connect together with hot knife cuts in half, and carries out finish forge again according to the forging method of claim 1 described a kind of finger cutter blank.

3, press two the shaping to forge the method for finger cutter blank according to claim 1,2 described a kind of cards of claim, it is characterized in that and by one half garden cylindricality slips and a pair of inner chamber be two kinds of clamps that involute shape slips is formed.

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