CN101336149B

CN101336149B - Method of repairing metal mold and paste agent for metal mold repair

Info

Publication number: CN101336149B
Application number: CN2006800520175A
Authority: CN
Inventors: 长谷川道治; 宫崎德幸; 中村正文; 山本直司; 上田和夫
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2005-12-16
Filing date: 2006-11-06
Publication date: 2011-02-09
Anticipated expiration: 2026-11-06
Also published as: JP4721185B2; JP2007160390A; CN101336149A

Abstract

The invention provides a method of repairing a metal mold in which cracks can be mended by simple working, and provide a paste agent for metal mold repair for use in the method. [MEANS FOR SOLVING PROBLEMS] A paste agent for repair containing a component destined for an alloy is directly applied to a surface of metal mold so as to cover a cracked portion of the metal mold. Thereafter, the paste agent for repair at its surface is coated with an oxidation inhibitor, and heated, so that the paste agent for repair infiltrates the crack interior and is converted to an alloy, thereby attaining crack filling.

Description

Metal die method for repairing and mending and metal die are repaired and are used paste

Technical field

The present invention relates to a kind of metal die method for repairing and mending of crack site of repairing pressing mold tool tool etc. and metal die repairs and uses paste.

Background technology

When cracking on pressing mold tool tool, conventional method for repairing and mending is, as shown in Figure 8, at first utilize cutting element with the crackle of metal die produce the position around bulk ground remove, weld at the enterprising windrow of this part of removing, carry out surface treatment then.

Put down in writing improving one's methods of above-mentioned conventional method for repairing and mending at patent documentation 1, promptly utilized plasma arc fusion metal die to repair and use powder, carried out built-up welding simultaneously.In this patent documentation 1, as described metal die repairing powder, it is the alloy powder that heat-resisting alloy constitutes as remainder that suggestion is used by carbide and Ni-Cr-Mo, wherein, its proportion of carbide adds up to below the 10wt% and by at least a above carbide among NbC, VC and the WC and constitutes.

In addition, patent documentation 2 discloses and diffusible metal powder is dispersed in the smears that solvent forms has been coated on mother metal and heating, make the technology of metal thus, the concrete proposition: when mother metal is the Zn alloy, in Cu or Mn, select any at least as diffusible element to the mother metal diffusion; Selected Cr when mother metal is the Fe alloy; When mother metal is the Ti alloy, in Al, Cr, Ni or N, select any at least; When mother metal is the Cu alloy, selected Ni.

Patent documentation 1: TOHKEMY 2005-97743 communique

Patent documentation 2: TOHKEMY 2004-68047 communique

Patent documentation 1 disclosed method is the same with prior art, when mended crack, cuts the metal die that contains the crackle part earlier, carries out built-up welding at this position then.When carrying out built-up welding, the influence of the heat during owing to welding, the place outside built-up welding place a little cracks, i.e. secondary cracks easily once more.

In addition, in the present method, produce the difference of position, have the situation that to use cutting element, repair time-consuming according to crackle.

On the other hand, patent documentation 2 disclosed technology though can improve many characteristics on mother metal surface, because smears itself does not become alloy by heat treatment, therefore can not be applied in the repairing of metal die.

Summary of the invention

Metal die method for repairing and mending of the present invention, the steps include: at first cracks at metal die, the repairing that will contain the composition that becomes alloy directly is coated on the metal die surface with paste, make this repairing cover the part of crackle with paste, be coated with surface and the further heating of this repairing by suppress material with oxidation then with paste, make repairing infiltrate inside crack with paste, and alloying and fill crackle.

Suppress material, preference such as salt (NaCl) as described oxidation.When adopting salt (NaCl), though carry out heating fluidization and be coated with after stacking, can be provided with weir portion for around preventing to flow to this moment.

In addition, preferably before the described metal die of heat fused is repaired with paste, avoid metal die and repair the part of using paste, and heating mother metal surface is to incandescent state.Like this, can avoid mother metal to capture heat and the paste of heat fused metal die repairing easily.

In addition, preferably before the coating oxidation suppressed material, the surface of repairing with paste at described metal die formed anti-decarburizer layer, because by described measure, can prevent because of the heating decarburization.

As heating means, though can adopt the local heat method of utilizing high frequency waves, utilize the overall heating means of tempering furnace or utilize overall heating means of vacuum drying oven etc., consider operability and convenience, preferably adopt burner.

In addition, the purpose that metal die of the present invention is repaired with paste is, after the cracks of metal die directly is coated with, by heating, makes it in the metal die diffusion inside, and alloying and fill crackle.

Repairing with the alloying component in the paste as being contained in metal die, is principal component with Ni (nickel), adds Mn (manganese), W (tungsten) and Fe (iron) at least again.In addition, make the paste of pasty state except multiple metal powder being dispersed in binder (solvent), also can be with two or more metal dusts after alloying, be dispersed in the paste of binder as powder.

Be specially following composition (ratio is represented with quality %):

Mn (manganese): more than 15% below 20%;

W (tungsten): more than 8% below 15%;

Fe (iron): more than 2% below 12%;

Co (cobalt): below 7%;

Cr (chromium): below 7%;

Si (silicon): below 7%;

C (carbon): below 2%;

B (boron): below 2%;

Ni (nickel): remainder.

Each is become the component selections aforementioned proportion, be based on following reason.

Mn (manganese): it generally is characterized as and improves hardenability, wearability and intensity.Also can be used as deoxidier and work, prevent embrittlement because of S (sulphur).But, if add volume, then cause and hardening crack, because of producing the remaining austenite embrittlement.In the present invention, be that main purpose is selected aforementioned proportion with the wearability that improves the alloy that generated.

W (tungsten): it generally is characterized as the generation carbide, improves hardness and improves temper resistance.Especially,, cause post-curing, improve wearability because the existence of Cr further improves temper resistance.But,, then become fragile if add volume.In the present invention, be that main purpose is selected aforementioned proportion to improve the temper resistance that generates alloy.

Fe (iron): Fe is the accurate basic ingredient that forms alloy, since very few or too much all can not bring into play alloy characteristic, aforementioned proportion therefore selected.

Co (cobalt): it generally is characterized as reinforcement martensite, improves wearability and high temperature hardness and keeps elevated temperature strength.In the present invention, be that main purpose is selected aforementioned proportion with the elevated temperature strength that keeps the generation alloy.

Cr (chromium): its general characteristic improves corrosion resistance and wearability for generating stable carbide, and its carbide suppresses the growth of crystal grain, promotes carburizing, improves hardenability and oxidative resistance, improves toughness.In addition, with V, Mo, W etc. generate double carbide, improve temper resistance.In the present invention, be that main purpose is selected aforementioned proportion to improve the wearability that generates alloy.

Si (silicon): its general characteristic improves anti-lonneal for improving deoxidation effect.If add volume,, damage malleability because of making the embrittlement of cementite graphitization.In addition, a spot of interpolation improves hardness and intensity, improves oxidative resistance, suppresses the growth of the crystal grain that causes because of heating.In the present invention, be that main purpose is selected aforementioned proportion to improve the oxidative resistance that generates alloy.

C (carbon): its general characteristic increases quenching hardness for improving martensitic strain rate.With Fe, Cr, Mo, generation carbide such as V and improve intensity.Increase tensile strength.Carbide increases, and then wearability improves.In the present invention, be that main purpose is selected aforementioned proportion to improve the tensile strength that generates alloy.

B (boron): its general characteristic is that micro-interpolation can improve hardenability, still, on the other hand, too much adds to produce Fe ₂B causes red brittleness.If a small amount of the interpolation can be improved the cutting durability.And, dwindle eutectic carbide.In the present invention, select aforementioned proportion with the fine main purpose that turns to of the eutectic carbide that generates alloy.

Ni (nickel): the same with Fe, also be the basis that forms alloy, a small amount of interpolation can be improved hardenability and toughness, can produce austenite but too much add, and causes embrittlement, therefore selects aforementioned proportion.

Use paste according to metal die method for repairing and mending of the present invention and metal die repairing, can pass through the simple working mended crack, repair bad phenomenon such as secondary cracks takes place afterwards nor exist.

Description of drawings

Fig. 1 is that explanation utilizes metal die of the present invention to repair the key diagram of an embodiment of the metal die method for repairing and mending of using paste;

Fig. 2 is the photo of the metal structure of the metal die before expression is repaired;

Fig. 3 is the enlarged photograph of Fig. 2;

Fig. 4 is the part intercepting expression of surrounding with square frame with Fig. 2, and with the photo of the state of method of the present invention after with the part repairing of crackle;

Fig. 5 is cut to the photo that relates to the part of having repaired with metal die;

Fig. 6 is the microphotograph of the metal structure of expression section;

Fig. 7 is the enlarged photograph of Fig. 6;

Fig. 8 is the figure of the Hotfix of the existing metal die of explanation.

The specific embodiment

Below, with reference to the description of drawings embodiments of the present invention.

At first, as shown in Figure 1, be the center partly with the crackle that produces in the metal die, be coated with described metal die repairing paste.Metal die is repaired with the mixed proportion of paste as shown in table 1 below.

Table 1

Then, repair with the anti-decarburizer of the surface spray of paste at described metal die; On metal die is repaired with paste, be treated to purpose and stack salt (NaCl) with the oxidation inhibition.

Then, with the surperficial sintering curing of salt, and then avoid metal die and repair the part of using paste, heating mother metal surface is to incandescent (about 1100 ℃) state.

Then, salt heated make it liquefaction, repair surface, and then the heating of metal mould is repaired and used paste with paste with the salt coating metal mould of liquefaction.Utilize heating process hereto, metal die is repaired with the paste fusing and is penetrated in the crackle, and alloying.

If can confirm the fusing of metal mending, heat at last with the repairing profile shaping of paste, and finish operation metal die with paste.

Fig. 2 to Fig. 7 is the photo of metal structure of the mending course of expression metal die.

Metal die before Fig. 2 represents to repair, Fig. 3 are the enlarged drawings with square frame encirclement part of Fig. 2.From these photos as can be known, the literal that relates to the metal die surface of crackle (literal of counter-rotating P).

Fig. 4 is the part intercepting expression of surrounding with square frame with Fig. 2, and with the photo of the state of method of the present invention after with the part repairing of crackle, by this photo as can be known, crack surfaces disappears in the part of implementing to repair.

Fig. 5 is the photo that metal die is cut off in the mode that relates to described repairing part, and Fig. 6 is the microphotograph of this section of expression, and Fig. 7 is the enlarged photograph of Fig. 6.From these photos as can be known, metal die is repaired with the paste fusing and is infiltrated in the crackle, becomes alloy after cooling.In addition, it can also be seen that, and metal die between some metal die of boundary portion repair and spread with paste.

What will carry in passing is, the width that alloy is formed up to crackle is the part of 0.1mm, the thickness of the alloy-layer that forms on the metal die surface is 0.15mm, the hardness of the alloy part on surface is HV356 (36HRC), the hardness of the alloy part in the crackle is HV324 (33HRC), and the hardness of mother metal is HV637 (57HRC).

Give an example for one that more than is embodiment, the heating treatment method that utilizes burner as method for repairing and mending has been described, but as heater means, the integral body heating that also can be suitable for the local heat of utilizing high frequency waves, the integral body heating that utilizes tempering furnace or utilize vacuum drying oven etc.

In addition, in an embodiment,, also can be with after the two or more metal dust alloyings though utilized the paste that a plurality of metal powders is dispersed in the pasty state of binder (solvent), be dispersed in the paste of binder as powder.

Claims

1. a metal die is repaired and is used paste, and it becomes alloy by heat treated after being filled in the crackle that produces in the metal die, it is characterized in that, this metal die is repaired and got following mass percent ratio with the solid formation branch of paste:

Mn:15% is above below 20%;

W:8% is above below 15%;

Fe:2% is above below 12%;

Below the Co:7%;

Below the Cr:7%;

Below the Si:7%;

Below the C:2%;

Below the B:2%;

Ni: remainder.

2. metal die method for repairing and mending, it is characterized in that, the described metal die repairing of claim 1 is deposited in the metal die surface with paste, make it cover the crackle that produces in the metal die, then suppressing material with oxidation is that NaCl coating metal mould is repaired the surface with paste, makes metal die repair with the paste heat fused then and infiltrates the interior and alloying of crackle.

3. metal die method for repairing and mending as claimed in claim 2 is characterized in that, before the described metal die of heat fused is repaired with paste, avoids metal die repairing paste part, and heating mother metal surface is to incandescent state.

4. metal die method for repairing and mending as claimed in claim 2 is characterized in that, the surface of repairing with paste at described metal die forms anti-decarburizer layer, and the described oxidation of coating suppresses material on this anti-decarburizer layer.

5. as each described metal die method for repairing and mending in the claim 2 to 4, it is characterized in that, heat by burner.