CN108611550B

CN108611550B - Equipment for inspecting chilling camshaft without chilling block

Info

Publication number: CN108611550B
Application number: CN201810609454.7A
Authority: CN
Inventors: 高连国; 周瑞华; 李昌江
Original assignee: Jingzhou Global Automotive Parts Co ltd
Current assignee: Jingzhou Global Automotive Parts Co ltd
Priority date: 2018-06-13
Filing date: 2018-06-13
Publication date: 2020-05-19
Anticipated expiration: 2038-06-13
Also published as: CN108611550A

Abstract

The invention provides a chilling block-free chilled camshaft which comprises the following components in percentage by mass: c%: 3.15-3.25; mn%: 0.69-0.96; si%: 2.15-2.25; p%: 0.15 MAX; s%: 0.20 percent; ni%: 0.25-0.35; cr%: 1.45-1.55; mo%: 0.40-0.50; the equipment for inspecting the right camshaft comprises an upper die and a lower die, wherein the upper die and the lower die are buckled to form an inner cavity matched with a camshaft, a plurality of cams are arranged on the camshaft at intervals, a plurality of grooves matched with the cams are formed in the inner cavity at intervals, the upper die and the lower die are buckled to form a forming shape, and when the camshaft abuts against a rod piece to extrude a first spring to the maximum degree, the camshaft is just at the maximum tolerance value. Through two molding modes of sand coating from an iron mold and resin sand, the cold shock camshaft without chilling blocks is produced by utilizing the condition of slow cooling of the resin sand; and then using the combined upper and lower types to check whether the camshaft is qualified.

Description

Equipment for inspecting chilling camshaft without chilling block

Technical Field

The invention relates to a camshaft, in particular to equipment for inspecting a chilling camshaft without a chill.

Background

Chilled cast iron has good wear resistance and galling resistance due to its high hardness carbide and ledeburite structure, the carbide also has a skeleton effect, and pearlite in ledeburite has an oil storage effect, so chilled cast iron is widely used as a camshaft material for internal combustion engines. The traditional production process of the cold shock camshaft ensures the core material through molten iron inoculation, and is convenient to process; during molding, a plurality of chilling blocks which are different in shape and can generate chilling action are preset in a cavity according to the angle of each peach shape, molten iron at the chilling block is rapidly cooled after molten iron is poured, white carbide and ledeburite tissues are generated in the depth range of 2-7mm on the surface of the peach shape, the surface hardness is HRC45-60, the center of the peach shape is grey tissue, the hardness is HB220-300, and the rest of the peach shape is hemp mouth tissue, so that the peach shape is convenient to process. Because each air inlet and outlet cam of the traditional chilled camshaft must be provided with a grey chill, each chill is required to be different because each peach-shaped angle is different. According to the calculation of each peach-shaped and each formed part of the six-cylinder camshaft, the upper box and the lower box need a single cold iron, each cold iron is also numbered for use, if the position is misplaced, the cold iron is waste, and the cold iron needs to be updated and supplemented continuously; and is also easily damaged if a combined chilling block is adopted. Because the cold iron is too much, the consumption of labor and cold iron is increased, particularly the rejection rate of falling sand and collapsing sand is increased, and the casting cost is too high.

Disclosure of Invention

The invention provides equipment for inspecting a chilling block-free chilled camshaft, and solves the problem of overlarge manual consumption of the camshaft in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a chilling-iron-free chilled camshaft comprises the following components in percentage by mass: c%: 3.15-3.25; mn%: 0.69-0.96; si%: 2.15-2.25; p%: 0.15 MAX; s%: 0.20 percent; ni%: 0.25-0.35; cr%: 1.45-1.55; mo%: 0.40-0.50.

A method for manufacturing cold shock camshaft without chill, adopt the resin sand and have no chill molding, control the content of C, Si, Cr, Ni, Mo strictly, the infertile, the carbide content 15-35% to 7mm from the surface, the blank whole hardness is HB 240-320; the chemical composition is controlled to be C%: 3.15-3.25; mn%: 0.69-0.96; si%: 2.15-2.25; p%: 0.15 MAX; s%: 0.20 percent; ni%: 0.25-0.35; cr%: 1.45-1.55; mo%: 0.40-0.50.

A method for manufacturing a chill-free chilled camshaft adopts a sand-lined metal mold molding process comprising equipment spot inspection, mold inspection, sand mixing, tamping, curing, demolding, material spraying and box closing; the chemical composition is controlled to be C%: 3.15-3.25; mn%: 0.69-0.96; si%: 2.15-2.25; p%: 0.15 MAX; s%: 0.20 percent; ni%: 0.25-0.35; cr%: 1.45-1.55; mo%: 0.40-0.50.

The utility model provides an equipment of inspection right camshaft, includes type and type down, type and type down lock form with the inner chamber of camshaft looks adaptation, the interval is equipped with a plurality of cams on the camshaft, the inner chamber interval set up a plurality ofly with the recess of cam looks adaptation, type and type down lock shaping, be equipped with first through-hole, second through-hole and the third through-hole that communicates in proper order on the type, third through-hole intercommunication the inner chamber, the card is equipped with the locating part on the first through-hole, the locating part outer end with the type surface flushes, the locating part has the member through first spring coupling, the member external diameter equals the locating part external diameter, third through-hole external diameter is greater than the member external diameter, works as the camshaft supports tightly the member will first spring extrudees when the at maximum the camshaft is in the tolerance maximum just.

Further, the novel die further comprises a sleeve piece, the inner diameter of the sleeve piece is matched with the outer diameter of the die, a fourth through hole through which a pressing rod can penetrate is formed in the sleeve piece, a second spring is wound on the pressing rod and connected with the sleeve piece, and a pulley is arranged on the pressing rod.

Compared with the prior art, the invention has the following beneficial effects: through non-inoculation, smelting process tests such as optimizing the content of alloy elements such as carbon, silicon, chromium and the like, and the condition of slow cooling of resin sand, the cold shock camshaft without chilling blocks is produced; and then using a test bar with the same size to check whether the camshaft is qualified.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic view showing the structure of an apparatus for inspecting a chill-less chilled camshaft according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained by combining the drawings and the detailed implementation mode:

the invention provides a chilling block-free chilled camshaft which comprises the following components in percentage by mass: c%: 3.15-3.25; mn%: 0.69-0.96; si%: 2.15-2.25; p%: 0.15 MAX; s%: 0.20 percent; ni%: 0.25-0.35; cr%: 1.45-1.55; mo%: 0.40-0.50.

A resin sand moulding process comprises die inspection, sand mixing, tamping, solidification, demoulding, paint spraying and mould closing.

a, inspection of the mold

Carrying out integrity check on the mold used at work, wherein the integrity check comprises whether the identification is clear and whether the furnace number is updated; whether a positioning pin sleeve on the die is blocked or not; whether the positioning pin is fastened, deformed and abraded; whether the mould is damaged or not; the sand-blasting.

b. Mixing sand, tamping and solidifying

Adding resin and curing agent according to the sand with fixed volume and the specified proportion, uniformly stirring, pouring the prepared sand into a sand box, tamping the sand mechanically or manually, and automatically curing at normal temperature.

c. Demoulding and spraying paint

And demolding by using a demolding machine or a travelling crane after the molding sand is solidified to reach a certain strength, spraying the coating on the cavity, and igniting and drying.

d, closing the box

The upper and lower iron boxes are pushed to a box closing machine, the box closing machine supports the upper box, and the upper box moves downwards and closes the box by aligning with the positioning pin of the lower box.

A device for inspecting a chilling camshaft without a chill comprises an upper die 1 and a lower die 2, wherein the upper die 1 and the lower die 2 are buckled to form an inner cavity matched with the camshaft 3, a plurality of cams 4 are arranged on the camshaft 3 at intervals, a plurality of grooves 5 matched with the cams 4 are arranged at intervals in the inner cavity, the upper die 1 and the lower die 2 are buckled to form a forming shape, a first through hole 6, a second through hole 7 and a third through hole 8 which are sequentially communicated are arranged on the die, the third through hole 8 is communicated with the inner cavity, a limiting part 10 is clamped on the first through hole 6, the outer end of the limiting part 10 is flushed with the outer surface of the die, the limiting part 10 is connected with a rod piece 12 through a first spring 11, the outer diameter of the rod piece 12 is equal to the outer diameter of the limiting part 10, the outer diameter of the third through hole 8 is larger than the outer diameter of the rod piece 12, when the camshaft 3 tightly supports the rod piece 12 and extrudes the first spring 11 to the maximum degree, the allowable tolerance range of the cam 4 on the camshaft 3 is based on a profile error, namely divided into 4 sectors, and comprises a cam ascending section profile error, a cam peak profile error and a cam descending section profile error, the error range is that the difference between a theoretical value and an actually allowable maximum deviation value of the cam 4 is equal to the deformation quantity of the first spring 11, the limiting piece 10 installed in the first through hole 6 is clamped in the first through hole 6 under the condition that the rod piece 12 is not directly pushed, when the produced cam 4 on the camshaft 3 exceeds the allowable error, the rod piece 12 presses the first spring 11, when the upper mold 1 and the lower mold 2 are relatively continuously folded, the rod piece 12 pushes the limiting piece 10 to emerge from the mold surface through the first spring 11, and the first through hole 6, the second through hole 7 and the third through hole 8 which are sequentially communicated form a unit through hole, the plurality of unit through holes are arranged on the die in a surrounding manner and correspond to the outer contour of the cam 4 in a surrounding manner, the limiting part 10 comprises a limiting part body and a boss 9 connected with the limiting part body, the outer diameter of the boss 9 is larger than that of the limiting part 10, 6 step holes are formed in the first through holes, and steps on the step holes correspond to the boss 9; and (3) checking whether the cam 4 of the camshaft 3 meets the standard, relatively folding the upper die 1 and the lower die 2, wherein if the limiting piece 10, namely the boss 9, protrudes out of the die surface, the result is unqualified, and if the product is qualified, the first spring 11 is always in a deformation range.

As a specific embodiment, the positioning device further includes a sleeve 13, an inner diameter of the sleeve 13 is matched with the outer diameter of the mold, a fourth through hole through which a pressing rod 15 can pass is arranged on the sleeve 13, a second spring 14 is wound on the pressing rod 15, the second spring 14 is connected to the sleeve 13, a pulley 17 is arranged on the pressing rod 15, the pressing rod 15 includes a pressing rod body 16 and a pressing end connected to the pressing rod body 16, and when the positioning device is used, the pressing end is compressed to drive the pressing rod body 16 to move downwards so as to enable the pulley 17 to cling to the positioning member 10, and then the sleeve 13 is rotated so that the positioning member 10 returns to the first through hole 6.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. An apparatus for inspecting a chill-less chilled camshaft, comprising: the cam shaft comprises an upper die and a lower die, wherein the upper die and the lower die are buckled to form an inner cavity matched with a cam shaft, a plurality of cams are arranged on the cam shaft at intervals, a plurality of grooves matched with the cams are formed at intervals, the upper die and the lower die are buckled to form a forming die, a first through hole, a second through hole and a third through hole which are sequentially communicated are arranged on the cam shaft, the third through hole is communicated with the inner cavity, a limiting part is clamped on the first through hole, the outer end of the limiting part is flush with the outer surface of the cam shaft, the limiting part is connected with a rod part through a first spring, the outer diameter of the rod part is equal to the outer diameter of the limiting part, the outer diameter of the third through hole is larger than the outer diameter of the rod part, when the cam shaft is tightly abutted against the rod part to extrude the first spring to the maximum degree, the limiting part in the first through hole is tightly clamped in the first through hole, when production cam on the camshaft surpasss tolerance, the member will first spring compresses tightly and works as when the type is continued relatively to be foldd down the member passes through first spring promotes the locating part emits the profile surface, still include the external member, the external member internal diameter with type external diameter looks adaptation, be equipped with the fourth through hole that the depression bar can pass on the external member, around having the second spring on the depression bar, second spring coupling the external member, be equipped with the pulley on the depression bar.