Machine installed surface aperture with jig opportunely

Installed surface machines craft (1) design analysis. Design requirement machines M36 × on crankshaft installed surface 3, 6H, drill the deep 65mm, whorl hole that attacks deep 50mm, pour included angle to be the horn of 90 ° in orifice, the verticality of the central line of requirement whorl aperture and installed surface is in 0.

002mm less than, machine φ 25+0.

The peg aperture of 021 +0mm, peg aperture gets deep 20mm of deep 22mm, boring, the verticality of the central line of requirement peg aperture and installed surface is in 0.

000 1mm less than, the aperture on its installed surface and balancing an opening that attend is to pass what fixed position is sold and bolt connection cooperates to assemble each other, the structural dimension of face of some crankshaft installation is shown 1 times like the graph. (2) the choice of technology program. The place through asking to machine to design place undertakes an analysis, optional choose machines a method two kinds: ① machines all aperture on installed surface on car mill center, the whorl milling cutter of boring cutter of 25mm of need φ 24mm and φ 33mm Qian Kongzuan, φ and M36 × 3mm, cost of devoted cutting tool is high. ② gives the fixed position among to sell aperture in the treatment on car mill center, refinance uses installed surface jig, use on crankshaft located at 6 o'clock principle, machine the whorl aperture on installed surface with average Z35 drilling machine, the cutting tool of need has common φ 32.

5mm twist drill, φ 32.

× of 9mm reamer, M36 3, 90 ° Huo gets 6H tap and φ 60mm × , through " bore, aperture of bore with a reamer, attack whorl, Huo aperture " technology program treatment, the treatment that can satisfy whorl aperture not only asks, and saved high cutting tool cost. 2.

The use of installed surface jig (1) analysis of structure of installed surface jig. Jig of crankshaft installed surface by auger bolt of pattern plate, fixed position, auger set, bore with a reamer is covered, attack whorl to cover, rings bolt, lozenge is sold reach fixed position to sell wait for composition, the assembly of installed surface jig is shown 2 times like the graph. 1.

Jig board 2.

Fixed position bolt 3.

Attack whorl to cover 4.

Bore with a reamer is covered 5.

Get set 6.

Rings bolt 7.

Lozenge is sold 8.

Fixed position sells installed surface jig is jig of type of a kind of cover board, jig of cover board type does not have clamping apparatus body, direct installation is getting component of its fixed position and clamp plant on pattern plate, jig locates on workpiece, its suit the treatment of the aperture on volume is large and heavy work. In treatment process lieutenant general its secure the fixed position datum plane in crankshaft installed surface to go up, installed surface jig is sold through fixed position and lozenge is sold fixed do not move, using treatment to cross the on same plane aperture on installed surface is. Structure of installed surface jig is simple, make precision of convenient, fixed position tall and light, yi Qing is divided cut bits, precision is machined in what aperture can assure in treatment. (2) jig complementary provided use. Installed surface jig machines what the size of aperture made corresponding form a complete set to get according to wanting when make set, bore with a reamer is covered, attack whorl to cover reach lozenge to sell etc complementary, solve installed surface aperture to machine medium difficult problem. Be aimed at × of M33 of crankshaft installed surface 3, the treatment of 6H whorl aperture, configured corresponding size auger set (see a picture 3) . Installed surface aperture uses installed surface jig in treatment process, use located at 6 o'clock principle, sell fixed position in inserting two when had gone out in the treatment on car mill center to sell aperture, among them the way that lozenge sells must be installed correct, prevent jig change to move. In bore process, broach swings easily to slant, bringing about the opening that treatment gives tilt, designed for this jig and auger set cooperate each other, through getting a clearance fit with broach, guide broach to be entered point-blank undertake bore. The central line that aperture assured after trying cutting and installed surface verticality are in 0.

Inside 002mm, satisfy design dimension requirement. The course is opposite ceaselessly installed surface jig, get covered improvement, make of its and broach cooperate each other more stable, the stability that machines an aperture is good, and the phenomenon that bits cuts to splatter in avoiding to machine a process, make machine process on the safe side. In procedure of opening of bore with a reamer, to assure the treatment precision of aperture of bore with a reamer, also made bore with a reamer cover (see a picture 4) . Often appear in procedure of opening of bore with a reamer bore diameter out of tolerance, inside surface roughness of surface of not straight, aperture is worth the central line of Kong Houkong of aperture out of round, bore with a reamer cannot satisfy the phenomenon such as the requirement, a variety of methods such as the rotate speed of the surplus that carries aperture of the size that changes reamer, bore with a reamer, reamer and feed speed cannot avoid the generation of this problem, designed installed surface jig for this and form a complete set designed φ 33+0.

025 +0mm bore with a reamer is covered and φ 32.

The reamer clearance fit of 9mm. Try cutting to machine via what cross many aperture, the precision of aperture is quite tall, and surplus of aperture of bore with a reamer also decreased, rose to machine efficiency. Graph 4 attack whorl all the time since it is a kind of the most difficult process in treatment. When attacking whorl, in be being buried in workpiece, tap undertakes cutting almost, tap is accumulated along whorl and workpiece interface big, aperture of the whorl after treatment appears easily sodden tooth, compasses had not connected and stop compasses do not stop to wait for a problem. Besides, drilling machine main shaft is flexible, in attacking whorl process main shaft swings at will, especially tap just was cut fashionable, swing the phenomenon is most serious, attack the whorl that go out to cannot achieve a requirement, those who adopt a variety of measure to cannot avoid a problem is recurrent. Course design jig and attack whorl to cover, the problem that in attacking whorl process, appears was solved basically. If the graph is shown 5 times,attack measure of structure of whorl set system. Of the design attack whorl is covered and tap cooperates to attack whorl each other, reduced tap the rock when attacking whorl, the coaxial that raised tap and drilling machine main shaft is spent, the random that solved the tap when attacking whorl swings problem, assured to machine the verticality of the whorl center clue that give and installed surface, avoided sodden tooth, compasses reach nevertheless stop compasses those who do not stop to wait for a problem is recurrent, and follow-up treatment is right in solving installed surface aperture to machine a process the injury that already machined exterior installed surface. 3.

Epilogue matchs through using installed surface jig corresponding complementary provide treatment to install face, solved aperture of installed surface bore, bore with a reamer and the problem that in attacking whorl process, encounter. This is in solving aperture to machine the means of the problem a relatively simple kind, be worth to popularize. Bibliographical reference: [1] Deng Yingjian, yang Dong rises.

Tolerancepublic errand cooperates with measure a technology [M] .

Beijing: Press of national defence industry, 2007.

[2] Meng Shaonong.

Machining craft manual [M] .

Beijing: Machinist trade publishing house, 1991.

Author of limited company of in relief engine of four travelling expenses: Chou Yang is foreign CNC Milling CNC Machining