CN102950429A - Preparation method of inching valve body for forklift - Google Patents

Abstract

The invention discloses a preparation method of an inching valve body for a forklift, comprising the following operating steps of: heating the blank casting part of the valve body to 650-760 DEG C, wherein the blank casting part of the inching valve body for the forklift comprises the chemical components in percentage by weight: 0.18-0.27% of C, 1.1-2.0% of Mn, 0.6-1.2% of Si, 0.08-0.15% of V, 0.11-0.2% of Ti, 0.8-2.0% of Cr, 0.5-1.5% of Ni, trace amount to 0.4% of Mo, 0.1-0.8% of W, 0.05-0.07% of Nb, trace amount to 0.23% of Al, trace amount to 0.50% of Cu, not more than 0.030% of P, not more than 0.030% of S and the balance of Fe and inevitable impurities; carrying out heat preservation for 5-6 hours; cooling a furnace to 280-320 DEG C; carrying out heat preservation for 3-5 hours; heating to 650-690 DEG C again; carrying out heat preservation for 32 hours; cooling to 400 DEGC at the rate of 40 DEG C/h; and then cooling to normal temperature at the rate of 20 DEG C/h. Advanced equipment is used in the processing course of an assembly, the cutting strength is strong, the precision is high, the production process is greatly simplified, the yield is greatly improved, and the product performance is stable.

Description

The fork truck preparation method of inching valve valve body

Technical field

The present invention relates to the fork truck preparation method of inching valve valve body.

Background technology

In the prior art, fork truck is with large of inching valve blank-spray paint-large-fine finishining of roughing overall length-roughing valve opening-fine finishining valve opening-fine finishining oil hole-fine finishining oil duct groove-fine finishining screw hole-fine finishining oil sealing plug hole-fine finishining-go acute angle, cleaning-assembling-test-packaging and warehousing.This technical process is too complicated, and the valve body overall performance that processing and manufacturing goes out is bad.

Summary of the invention

The purpose of this invention is to provide a kind of fork truck preparation method of inching valve valve body, assembly has used sophisticated equipment in process; The cutting dynamics is strong, and precision is high, has greatly reduced production technology, make it output and significantly promote, and properties of product is stable.

Technical scheme of the present invention is as follows:

The fork truck preparation method of inching valve valve body includes following operating procedure:

A, fork truck with chemical component weight percentage in the inching valve valve body blank cast member is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo trace～0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al trace～0.23%, Cu trace～0.50%, P≤0.030%, S≤0.030%, surplus is Fe and inevitably is mingled with matter, the valve body blank spare that will contain said components is heated to 650-760 ℃, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 40 ℃/hour, with 20 ℃/hour, be cooled to normal temperature again; Heat treatment is secondary repeatedly;

A, miller order: select the cast iron valve body blank that contains mentioned component content in the material, utilize Special horizontal brank valve body to clamp with back side blank location, the recycling circular peripheral-mill mills large plane, stays 0.3mm allowance to guarantee the poor 0.015mm of being not more than of peripheral thickness;

B, driller's order: select large drill jig of valve body, with large face and the boring of peripheral profile positioning compression;

1), select the 9mm straight shank twist drill to bore 5-9 mm installing holes, and drill through;

2), at two place's oil duct end points and screw place and place, 5-8.2 mm apertures use respectively the drill bit spot-facing of 8.2 straight shank twist drills;

3), the taper drill that utilizes radial drill is with large face and 2-9 mm hole positioning compressions borings, preboring 25 mm holes are 13 mm;

C, borer order: with large face and location, 2-9 mm holes, 30 mm oil sealing holes compress bore hole up;

D, Quenching Treatment: will send into through the valve body after the machining and be heated to 850-890 ℃ in the heat-treatment furnace, and be incubated 2-3 hour; Then, cool off with quenching oil;

E, temper: the valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering furnace, insulation 50-70min.

Assembly of the present invention has used sophisticated equipment in process; The cutting dynamics is strong, and precision is high, has greatly reduced production technology, make it output and significantly promote, and properties of product is stable.

Assembly of the present invention has used sophisticated equipment in process; The cutting dynamics is strong, and precision is high, has greatly reduced production technology, make it output and significantly promote, and properties of product is stable.

It is as follows that the inching valve that utilizes the present invention to produce carries out experimentation:

Experiment condition: 80 ± 5 ℃ of Fuel temperatures; Experiment is with oily: No. 6 hydraulic transmission oils; Experiment oil pressure: 1.25MPa ~ 1.4MPa; Test period: many 6 minutes, the per minute valve rod back and forth spurred once; Fretting performance test fretting performance requires: valve rod travel: 0 ~ 2 mm; Performance reaches requirement pressure: 1.25 ~ 1.4 MPa; 0.3 ~ 0.6 MPa; 0 ~ 0.15 MPa; The test of fine motion valve rod total travel: total travel 25 ± 1mm, requiring should be without catching phenomenon at total travel inner valve stem self-resetting; The operating physical force that valve rod is pulled out should be 257 ± 16N; In above-mentioned process of the test, do not allowed outer seepage phenomenon; Test oil should guarantee cleannes, more renew oil or Clean-oil behind 400 covers of test.

The specific embodiment

The fork truck preparation method of inching valve valve body includes following operating procedure:

A, fork truck with chemical component weight percentage in the inching valve valve body blank cast member is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo trace～0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al trace～0.23%, Cu trace～0.50%, P≤0.030%, S≤0.030%, surplus is Fe and inevitably is mingled with matter, the valve body blank spare that will contain said components is heated to 650-760 ℃, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 40 ℃/hour, with 20 ℃/hour, be cooled to normal temperature again; Heat treatment is secondary repeatedly;

A, miller order: select the cast iron valve body blank that contains mentioned component content in the material, utilize Special horizontal brank valve body to clamp with back side blank location, the recycling circular peripheral-mill mills large plane, stays 0.3mm allowance to guarantee the poor 0.015mm of being not more than of peripheral thickness;

B, driller's order: select large drill jig of valve body, with large face and the boring of peripheral profile positioning compression;

1), select the 9mm straight shank twist drill to bore 5-9 installing holes, and drill through;

2), at two place's oil duct end points and screw place and place, 5-8.2 apertures use respectively the drill bit spot-facing of 8.2 straight shank twist drills;

3), the taper drill that utilizes radial drill is with large face and 2-9 hole positioning compressions borings, preboring 25 holes are 13;

C, borer order: locate 30 oil sealing holes with large face and 2-9 holes and compress bore hole up

D, Quenching Treatment: will send into through the valve body after the machining and be heated to 850-890 ℃ in the heat-treatment furnace, and be incubated 2-3 hour; Then, cool off with quenching oil;

E, temper: the valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering furnace, insulation 50-70min.

The detection performance indications are as follows:

Tensile strength sigma b (MPa): 〉=630

Yield strength σ s (MPa): 〉=520

Percentage elongation δ 5 (%): 〉=12

Contraction percentage of area ψ (%): 〉=55

Notched bar impact strength α kv (J/cm2): 〉=52

Hardness:＞=190HB.

Claims (1)

1. fork truck is characterized in that with the preparation method of inching valve valve body, includes following operating procedure:

A, fork truck with chemical component weight percentage in the inching valve valve body blank cast member is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo trace～0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al trace～0.23%, Cu trace～0.50%, P≤0.030%, S≤0.030%, surplus is Fe and inevitably is mingled with matter, the valve body blank spare that will contain said components is heated to 650-760 ℃, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 40 ℃/hour, with 20 ℃/hour, be cooled to normal temperature again; Heat treatment is secondary repeatedly;

A, miller order: select the cast iron valve body blank that contains mentioned component content in the material, utilize Special horizontal brank valve body to clamp with back side blank location, the recycling circular peripheral-mill mills large plane, stays 0.3mm allowance to guarantee the poor 0.015mm of being not more than of peripheral thickness;

B, driller's order: select large drill jig of valve body, with large face and the boring of peripheral profile positioning compression;

1), select the 9mm straight shank twist drill to bore 5-9 mm installing holes, and drill through;

2), at two place's oil duct end points and screw place and place, 5-8.2 mm apertures use respectively the drill bit spot-facing of 8.2 mm straight shank twist drills;

3), the taper drill that utilizes radial drill is with large face and 2-9 mm hole positioning compressions borings, preboring 25 mm holes are 13 mm;

C, borer order: with large face and location, 2-9 mm holes, 30 mm oil sealing holes compress bore hole up;

D, Quenching Treatment: will send into through the valve body after the machining and be heated to 850-890 ℃ in the heat-treatment furnace, and be incubated 2-3 hour; Then, cool off with quenching oil;

E, temper: the valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering furnace, insulation 50-70min.