CN104805393B

CN104805393B - Car door latches multipurpose furnace carburizing quenching process

Info

Publication number: CN104805393B
Application number: CN201510273682.8A
Authority: CN
Inventors: 娄平; 娄方银; 高世辉; 娄春燕; 黄伟
Original assignee: Chongqing Yin Yan Science And Technology Ltd
Current assignee: Chongqing Yin Yan Science And Technology Ltd
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2017-12-26
Anticipated expiration: 2035-05-26
Also published as: CN104805393A

Abstract

The invention discloses a kind of car door to latch multipurpose furnace carburizing quenching process, comprises the following steps：1) lock, is loaded into multipurpose furnace carburizing room and is heated to 880 DEG C, carbon potential 0.2%, is incubated 60 minutes；2) carbon potential, is raised to 1.2%, is passed through ammonia, is incubated 80 minutes；3) temperature, will be oozed and drop to 870 DEG C, carbon potential is down to 1.1%, keep ammonia flow constant, be incubated 5 minutes；Carburizing temperature of the present invention is maintained at 880 DEG C, be avoided that temperature it is too high caused by carburized (case) depth excessive problem；In step 2), carbon potential rise can increase the surface carbon concentration of lock, improve surface hardening hardness, and the and can that is passed through of ammonia improves lock quenching degree and the uniformity of hardenability and interior tissue；In step 3), the soaking time after cooling is short, so that catch surface and core produce certain temperature difference, can meet the metallographic structure requirement for latching core；The requirement that can meet to latch using domestic Q235 material manufactures car door by this technique, save lock manufacturing cost.

Description

Car door latches multipurpose furnace carburizing quenching process

Technical field

The present invention relates to a kind of quenching technical, more particularly to a kind of quenching technical of car door lock.

Background technology

In the prior art, car door lock is typically made up of Q235 materials, and its Technology for Heating Processing is modifier treatment, carburized layer Deep to require to be 0.2-0.4mm, case hardness requirement is HRC35-40.Because domestic steel-smelting technology level differs, the life of some manufacturers The Q235 material qualities of production are poor, simultaneously because domestic heat treatment technics relatively falls behind so as to use the Q235 materials of inferior quality Material reaches foregoing thermal treatment quality requirement, and manufacture difficulty is very big, therefore many companies domestic at present are all come generation with 20Cr materials Latched for Q235 material manufactures car door.

There is cheap and processing easy-formation (direct punch forming) in itself yet with Q235 materials, relative to adopting With 20Cr materials, the reduction production cost that it can be very big, it is therefore desirable to which a kind of Technology for Heating Processing is to meet to use Q235 material systems Make the requirement of car door lock.

The content of the invention

In view of this, it is an object of the invention to provide a kind of car door to latch multipurpose furnace carburizing quenching process, to solve to adopt The problem of being latched with Q235 material manufactures car door.

Car door of the present invention latches multipurpose furnace carburizing quenching process, comprises the following steps：

1) lock, is loaded into multipurpose furnace carburizing room and is heated to 880 DEG C, carbon potential 0.2%, and it is incubated 60 minutes；

2) carbon potential, is raised to 1.2% after step 1), while the ammonia that flow is 2.5-3.2L/min is passed through to carburizing room Gas, and it is incubated 80 minutes；

3) carburizing room temperature, is dropped to 870 DEG C after step 2), temperature fall time is 5 minutes, and carbon potential is down into 1.1%, protected It is 2.5-3.2L/min to hold ammonia flow, and is incubated 5 minutes；

4) quenching cooling directly, is carried out to lock afterwards in step 3).

Beneficial effects of the present invention：

Car door of the present invention latches multipurpose furnace carburizing quenching process, and in step 1) and step 2), carburizing temperature is maintained at 880 DEG C, infiltration temperature it is relatively low, be avoided that temperature it is too high caused by carburized (case) depth excessive problem；In step 2), carbon potential liter Height, and ammonia has been passed through simultaneously, so as to increase the surface carbon concentration of lock, surface hardening hardness is improved, and ammonia is logical Entering and can makes nitrogen-atoms penetrate into catch surface, so as to improve lock quenching degree and hardenability, improves case hardness, and reduce Austenitizing temperature, improve the uniformity of lock interior tissue；In step 3), the soaking time after it cools is short, so that Catch surface and core produce certain temperature difference, can realize the gold for meeting lock core while catch surface tissue hardness is qualified Phase constitution requirement；The requirement that can meet to latch using domestic Q235 material manufactures car door by this technique, save lock manufacture Cost.

Brief description of the drawings

Fig. 1 is that car door of the present invention latches multipurpose furnace carburizing quenching process curve map.

Embodiment

The invention will be further described with reference to the accompanying drawings and examples.

As illustrated, the present embodiment car door latches multipurpose furnace carburizing quenching process, comprise the following steps：

4) quenching cooling directly, is carried out to lock afterwards in step 3).

Following table is that the result of sampling inspection table of lock is made using the present embodiment technique：

Exemplar	Carburized layer depth (mm)	Case hardness (HRC)
			1	0.36mm	38
2	0.34mm	39
			3	0.37mm	37

The present embodiment car door latches multipurpose furnace carburizing quenching process, and in step 1) and step 2), carburizing temperature is kept At 880 DEG C, be avoided that temperature it is too high caused by carburized (case) depth excessive problem；In step 2), carbon potential rise, and be passed through simultaneously Ammonia, so as to increasing the surface carbon concentration of lock, surface hardening hardness is improved, and the and can that is passed through of ammonia makes nitrogen-atoms Catch surface is penetrated into, so as to improve lock quenching degree and hardenability, improves case hardness, and reduces austenitizing temperature, Improve the uniformity of lock interior tissue；In step 3), the soaking time after it cools is short, so that catch surface and core Certain temperature difference is produced, the metallographic structure requirement for meeting lock core while catch surface tissue hardness is qualified can be realized；It is logical The requirement that this technique can meet to latch using domestic Q235 material manufactures car door is crossed, saves lock manufacturing cost.

Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this Among the right of invention.

Claims

1. a kind of car door latches multipurpose furnace carburizing quenching process, it is characterised in that：Comprise the following steps：

2) carbon potential, is raised to 1.2% after step 1), while the ammonia that flow is 2.5-3.2L/min is passed through to carburizing room, and Insulation 80 minutes；

3) carburizing room temperature, is dropped to 870 DEG C after step 2), temperature fall time is 5 minutes, and carbon potential is down into 1.1%, keeps ammonia Throughput is 2.5-3.2L/min, and is incubated 5 minutes；

4) quenching cooling directly, is carried out to lock afterwards in step 3).