阅读说明：本技术 强耐磨硬质合金钢锤具表面处理方法 (Surface treatment method for hard alloy steel hammer with strong wear resistance ) 是由 林嘉懋 于 2020-04-17 设计创作，主要内容包括：本发明公开了高强耐磨硬质合金钢锤具表面处理方法,包括以下步骤：S1.表面处理；S2.镀铬；S3.渗透：将锤具的敲击面加热到熔融状态,加热温度不低于1857.0℃,随后将温度恒定,铬受热熔与锤具的敲击面熔融材料相互渗透,在锤具的敲击面由外至内形成含铬层,且含铬层中铬的浓度由外至内递减；然后空冷敲击面；S4.表面热处理。本技术方案提出的高强耐磨硬质合金钢锤具表面处理方法处理的锤具针对锤具表面强化,使锤具的表面具有优秀的强度和耐磨性能。针对锤具两端进行渗透,使铬渗透到锤具两端的敲击面内,形成强度由内向外逐渐增强的复合层,从而能够支撑锤具端部表面的镀铬层。(The invention discloses a surface treatment method of a high-strength wear-resistant hard alloy steel hammer, which comprises the following steps: s1, surface treatment; s2, chromium plating; s3, infiltration: heating the knocking surface of the hammer to a molten state, wherein the heating temperature is not lower than 1857.0 ℃, then keeping the temperature constant, enabling the chromium to be mutually permeated with the molten material of the knocking surface of the hammer by hot melting, forming a chromium-containing layer on the knocking surface of the hammer from outside to inside, and enabling the concentration of the chromium in the chromium-containing layer to decrease from outside to inside; then air-cooling the knocking surface; s4, surface heat treatment. The hammer processed by the surface treatment method of the high-strength wear-resistant hard alloy steel hammer provided by the technical scheme aims at surface strengthening of the hammer, so that the surface of the hammer has excellent strength and wear resistance. The two ends of the hammer are penetrated, so that chromium penetrates into the knocking surfaces at the two ends of the hammer to form a composite layer with gradually enhanced strength from inside to outside, and the chromium-plated layer on the surface of the end part of the hammer can be supported.)

1. The surface treatment method of the high-strength wear-resistant hard alloy steel hammer is characterized by comprising the following steps of:

s1, surface treatment

Removing impurities on the surface of the hammer;

s2, chromium plating

Plating chromium on the surface of the hammer;

s3, infiltration

Heating the knocking surface of the hammer to a molten state, wherein the heating temperature is not lower than 1857.0 ℃, then keeping the temperature constant, enabling the chromium to be mutually permeated with the molten material of the knocking surface of the hammer by hot melting, forming a chromium-containing layer on the knocking surface of the hammer from outside to inside, and enabling the concentration of the chromium in the chromium-containing layer to decrease from outside to inside; then air-cooling the knocking surface;

s4, surface heat treatment

Heating the hammer to 300-1300 ℃, wherein the hammer is in a red hot state, and then quenching the hammer in the red hot state in a molten salt bath at the temperature of 232-399 ℃.

2. The method of claim 1, wherein in step S3, when the striking surface of the hammer is heated to a molten state, a penetrating agent is added to the molten state, wherein the penetrating agent is at least partially soluble in the metal matrix during the penetrating process, and at least partially remains in the matrix metal in the molten state.

3. The surface treatment method for the high-strength wear-resistant hard alloy steel hammer according to claim 2, wherein the penetrating agent is tungsten or vanadium.

4. The surface treatment method for the high-strength wear-resistant hard alloy steel hammer according to any one of claims 1 to 3, wherein step S4 is followed by step S5. knocking surface hardening specifically as follows:

heating 1-5cm at two ends of the hammer to 700-950 ℃, and then putting the hammer into oil or water at room temperature for quenching;

tempering is carried out after the hammer is cooled, the temperature of the hammer is raised to 500-750 ℃, the temperature is kept for 20-60 minutes, and then the hammer is naturally cooled.

5. The surface treatment method for the high-strength wear-resistant hard alloy steel hammer according to claim 4, wherein the tempering is repeated 2 to 3 times.

Technical Field

The invention belongs to the technical field of mechanical tools, and particularly relates to a surface treatment method for a hard alloy steel hammer with strong wear resistance.

Background

A hammer is a tool that strikes an object to move or deform it. Most commonly used for nailing, straightening or knocking out objects. The hammer is a main striking tool and comprises a hammer head and a hammer handle, and the hammer is divided into a rust removal hammer, a nipple hammer, a machine, a claw hammer, a check hammer, a flat tail check hammer, an octagonal hammer, a German octagonal hammer and a nail-lifting hammer according to functions

The hammer head of the existing hammer is very easy to damage in the using process, the main damage forms of the hammer head are cracking, missing, deformation and the like, and especially the striking surface at the end of the hammer is more easy to deform, crack and miss in the using process.

Disclosure of Invention

The invention provides a surface treatment method of a hard alloy steel hammer with strong wear resistance, aiming at the problems in the prior art.

The invention solves the technical problems through the following technical means: the surface treatment method of the high-strength wear-resistant hard alloy steel hammer comprises the following components in percentage by weight: c-0.6-1.6, W-8-19, Cr-3-5.5, Mn-0.1-0.5, V-1-4.5, S <0.08, P < 0.025, Ni 0.035-0.05, and F < - > for the rest, and a hammer body for casting forming, wherein before casting, the spheroidization and inoculation of the molten iron are carried out twice, and the first spheroidization and inoculation are carried out simultaneously in a molten iron treatment ladle. The rare earth ferrosilicon magnesium nodulizer FeSiMg6RE1 is used for one-time nodulizing, the adding amount is 1.2-1.4 percent of the total weight of the molten iron, and the granularity is 15-25 mm. The primary inoculation adopts barium-silicon-iron inoculant (the mass fractions of Si 60-65%, Ba 4-6%, Ca0.8-2.5%, Al 1.0-2.0%, Mn 8-10% and the balance Fe), the addition amount of the barium-silicon-iron inoculant is 0.6-1.0% of the total molten iron, and the granularity of the barium-silicon-iron inoculant is 6-12 mm. Putting 70% of nodulizer in a semicircular groove at one side of the bottom of the ladle, simultaneously paving an inoculant on the surface of the nodulizer, covering and compacting the surface by straw ash and waste sand, then preheating a molten iron treatment ladle with a ladle cover to about 700 ℃, starting to add molten iron, firstly adding 70% of molten iron into the treatment ladle through an injection pipe on the ladle cover, supplementing 30% of molten iron after stabilization, opening the ladle cover after complete reaction, repeatedly slagging off for a plurality of times to thoroughly slagging off and keep warm, and finally measuring the ladle-out pouring temperature of the molten iron to be 1420 ℃.

Then, a secondary spheroidizing method is adopted, a reaction chamber is arranged between a sprue and a cross gate of the pouring system, the rest 30 percent of FeSiMg6RE1 spheroidizing agent is placed, and a ceramic filter screen is placed at the corresponding part.

The secondary inoculation adopts a stream inoculation treatment method, and 5 percent of BaF is selectively added₂The 75 ferrosilicon of the activating agent is added in an amount of 0.1 to 0.3 percent, and the granularity of the activator is 0.2 to 1 mm;

the method specifically comprises the following steps:

s1, surface treatment

Removing impurities on the surface of the hammer;

s2, chromium plating

Plating chromium on the surface of the hammer;

s3, infiltration

Heating the knocking surface of the hammer to a molten state, wherein the heating temperature is not lower than 1857.0 ℃, then keeping the temperature constant, enabling the chromium to be mutually permeated with the molten material of the knocking surface of the hammer by hot melting, forming a chromium-containing layer on the knocking surface of the hammer from outside to inside, and enabling the concentration of the chromium in the chromium-containing layer to decrease from outside to inside; then air-cooling the knocking surface;

s4, surface heat treatment

Heating the hammer to 300-1300 ℃, wherein the hammer is in a red hot state, and then quenching the hammer in the red hot state in a molten salt bath at the temperature of 232-399 ℃.

Further, in step S3, when the striking surface of the hammer is heated to the molten state, the penetrating agent is added to the molten state, and at least part of the penetrating agent is soluble in the metal matrix during the penetrating process, and at least part of the penetrating agent remains in the matrix metal in the molten state.

Further, the penetrating agent is tungsten or vanadium.

Further, step S5 is performed after step S4. the striking surface is hardened as follows:

heating 1-5cm at two ends of the hammer to 700-950 ℃, and then putting the hammer into oil or water at room temperature for quenching;

tempering is carried out after the hammer is cooled, the temperature of the hammer is raised to 500-750 ℃, the temperature is kept for 20-60 minutes, and then the hammer is naturally cooled.

Further, the tempering is repeated 2-3 times.

The invention has the beneficial effects that: the hammer processed by the surface treatment method of the high-strength wear-resistant hard alloy steel hammer provided by the technical scheme aims at surface strengthening of the hammer, so that the surface of the hammer has excellent strength and wear resistance.

The two ends of the hammer are penetrated, so that chromium penetrates into the knocking surfaces at the two ends of the hammer to form a composite layer with gradually enhanced strength from inside to outside, and the chromium-plated layer on the surface of the end part of the hammer can be supported.

Drawings

FIG. 1 is a schematic illustration of the chromium concentration of a chromium-containing layer according to the present invention;

FIG. 2 is a phase diagram of the hammer structure after the surface heat treatment step of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.