CN1118724A

CN1118724A - Metallic mold used for plug

Info

Publication number: CN1118724A
Application number: CN95101960A
Authority: CN
Inventors: 山田一博
Original assignee: YUNISIAJAX CO Ltd
Current assignee: YUNISIAJAX CO Ltd
Priority date: 1994-02-25
Filing date: 1995-02-25
Publication date: 1996-03-20
Anticipated expiration: 2015-02-25
Also published as: KR950033199A; JPH07232237A; CN1050545C

Abstract

The purpose of this invention is to provide a die for a piston which reduces the man-hour for the notch parts of a pin boss part and the end part of openings of pin holes, and improves the working precision. In a die for a piston, forming spaces A, B are formed by arranging a lower die 3 to be arranged in a cylindrical die 2, a core 5 to hold this lower die 3 from each side, and an upper die 4 to house the lower die 3 and the core 5, and a piston body 10 which is integratedly provided with a pin boss part 11 in these forming spaces A, B is formed. The core 5 is arranged on each side in the axial direction of the piston of the lower die 3, an inclined part 8 to form a notch part 15 on the end surface of the pin boss part 11 is provided at the part to form the pin boss part 11 of this core 5, and a projecting part 9 to form a chamfered part 17 on the end surface of the pin boss part 11 is provided on this inclined part 8.

Description

The metal die that piston is used

The present invention relates to the metal die that a kind of internal combustion engine of making automobile etc. is used.

Generally, the piston that internal combustion engine is used as shown in Figure 6, all leaves pin-and-hole 12 respectively in the pair of pistons key seat portion 11 that is integrally formed in piston only 10, and piston pin (not having expression on the figure) then is inserted in wherein on pin-and-hole 12 ground across these both sides.Under this occasion, for make piston pin be inserted into 12 li of this pin-and-holes easily, for the stress of the open end that reduces pin-and-hole 12, often carry out the processing of chamfering 16 at the open end of pin-and-hole 12.

Once in real fair 2-46559 number of Japanese patent gazette for example, disclosed with the piston of this structural similarity.

In addition, according to the requirement of the nearest internal combustion engine weight that alleviates gas car etc., developed piston as shown in Figure 7.This structure of piston is to make the upper end 13 of the piston boss portion 11 of piston only 10 vertical with pin-and-hole 12, in order to alleviate the amount of hanging down, the lower end surface 13 of piston boss portion 11 is formed the otch 15 that relative pin-and-hole 12 tilts, generally, after piston is shaped, form this otch 15 with methods such as machining, and process chamfering 16 on the perpendicular end surface 13 and the chamfering 17 on the otch 15 at the open end of pin-and-hole 12.

But, above-mentioned with pre-structure in, be to form otch 15 with methods such as machining, and in the chamfer machining process, at upper bevel 16 places of piston boss portion 11, the motion of lathe tool is the garden arc, carry out high-precision processing, and, must make the ellipse garden of moving into of lathe tool shape at the bottom of piston boss portion 11 chamfering 17 places, therefore just the problem that makes machining period increase and make precise decreasing is arranged.

The objective of the invention is in order to solve above-mentioned prior art problems, provide the machining period of a kind of otch that can make piston boss portion and pin-and-hole open end to reduce, can improve the metal die that the piston of machining accuracy is used.

The piston metal die of the present invention of making to achieve the above object is the counterdie that is configured in the tubular mould of garden, clamp the core of this counterdie from both sides, the patrix that covers on this counterdie and the core suitably sets, form formingspace, in this formingspace, form and have with the piston only of piston only all-in-one-piece piston boss portion, it is characterized in that the axis of the piston that above-mentioned core is configured in counterdie to two sides on, at the position of the formation piston boss portion of core the rake that the end face that makes this piston boss portion forms otch is being set, the protuberance that the end face that makes piston boss portion forms chamfering is being set on this rake.

When forming piston with metal die, can form otch on the end face of piston boss portion, on the end face portion of piston boss portion, form chamfering, therefore just need not carry out the processing that adds mouth and chamfering of piston boss portion, can prevent precise decreasing with the piston of this structure.

Fig. 1 is the profile of the piston of expression one embodiment of the present of invention with metal die,

Fig. 2 is the profile that the x-x line along Fig. 1 obtains,

Fig. 3 is the side view of expression piston of the present invention with the protuberance on the core of metal die,

The profile of major part when Fig. 4 is the shaping of the piston used of expression internal combustion engine,

Fig. 5 is the profilograph of the piston used of expression internal combustion engine,

Fig. 6 is the profilograph of the piston used of internal combustion engine before the expression,

Fig. 7 is the profilograph of the another kind of piston used of internal combustion engine before the expression.

Below, with reference to Fig. 1～Fig. 5, one embodiment of the present of invention are described.The part identical with member in the former example all used same symbol.

Fig. 1 is the profile of the metal die used of expression piston, and Fig. 2 is the profile of obtaining along the x-x line of Fig. 1, and Fig. 5 is the profile of piston only.Among the figure, the 1st, the metal die that piston is used, the 3rd, counterdie, the 5th, core, the 10th, piston only.

The metal die 1 that piston is used is the patrix 4 that the counterdie 3 of ＂ T ＂ font, the left and right sides from figure clamp the core 5 of this counterdie 3 and cover the garden plate-like on this counterdie 3 and the core 5 by the section in the mould 2 that is configured in the garden tubular and constitutes.

The face that joins with counterdie 3 of core 5 is made the plane, and the recess 7 that surrounds protuberance 6 is formed peripheries.Like this, the top of the protuberance 6 of this core 5 and the top 3a of counterdie 3 and periphery just constitute the formingspace A at the hat top 18 of piston only 10, and the recess 7 of core 5 then constitutes the formingspace B of the piston boss portion 11 of piston only 10.

Also vertical plane 7a is made on the above top of the center line by recess 7 of core 5 (central shaft of pin-and-hole 12), make piston boss portion 11 tops form vertical end face 13; Rake 8 is made in the bottom that above-mentioned center line is following, make piston boss portion 11 bottoms form otch 15 by the surface of this rake 8.Also on the rake 8 of the recess 7 of core 5, form the protuberance 9 of half garden shape, after pin-and-hole 12 processing, make the open end of pin-and-hole form chamfering 17 by this protuberance 9.

Below, the casting process of piston only 10 and the manufacturing procedure of piston boss portion 11 are described.

Counterdie 3 is configured in the garden tube mould 2 of the metal die 1 that piston uses, core 5 is placed on the axial two sides of pin-and-hole 12 of this counterdie 3, above this counterdie 3 and the core 5, after the height place of regulation covers patrix 4, casting, in formingspace A, B, form hat top 18 and piston boss portion 11 respectively.And, form otch 15 in piston boss portion 11 bottoms by the rake 8 of core 5; Protuberance 9 by core 5 forms recess 14 (referring to Fig. 4) in piston boss portion 11 bottoms.

After this, as illustrated in fig. 5, the center machine pin hole processing 12 in piston boss portion 11 at this moment, cuts the core of recess 14 of the open end of pin-and-hole 12 bottoms, forms chamfering 17 on outer peripheral edges.Then process the chamfering 16 of the open end on pin-and-hole 12 tops.

Thus, can guarantee to be subjected to produce the machining accuracy of the chamfering 16 of pin-and-hole 12 upper, open end of stress greatly by combustion pressure.The open end of pin-and-hole 12 bottoms by those can being subjected to the inertia force effect littler than combustion pressure forms chamfering 17 and otch 15, and piston weight is alleviated, and is reduced man-hour, and can prevent precise decreasing.

As implied above, because the present invention is the counterdie that is configured in the tubular mould of garden, clamp the core of this counterdie from both sides, the patrix that covers on this counterdie and the core suitably sets, form formingspace, forming the piston have with the piston only of piston only all-in-one-piece piston boss portion in this formingspace with in the metal die, the axis of the piston that above-mentioned core is configured in counterdie to two sides on, at the position of the formation piston boss portion of core the rake that the end face that makes this piston boss portion forms otch is set, the protuberance that the end face that makes piston boss portion forms chamfering is set on this rake, thereby when being shaped, piston only can on the end face of piston boss subordinate portion, form otch, end face formation chamfering in piston boss portion.Like this, just can not needed to carry out the otch of piston boss portion and the processing of chamfering, the machining period number is reduced, and can prevent precise decreasing, stress on the necessary part of piston boss portion is reduced, can easily carry out the effects such as assembling of piston pin.

Claims

1. metal die that piston is used, it is the counterdie that is configured in the tubular mould of garden, clamp the core of this counterdie from both sides, the patrix that covers on this counterdie and the core suitably sets, form formingspace, in this formingspace, form and have with the piston only of piston only all-in-one-piece piston boss portion, it is characterized in that above-mentioned core be configured in counterdie along the axis of the piston to two sides on, at the position of the formation piston boss portion of core the rake that the end face that makes this piston boss portion forms otch is being set, the protuberance that the end face that makes piston boss portion forms chamfering is being set on this rake.