CN102303223B

CN102303223B - Process flow for machining lower punching die

Info

Publication number: CN102303223B
Application number: CN 201110253626
Authority: CN
Inventors: 蔡胡磊; 李凤冰
Original assignee: NBTM (JIANGMEN) POWDER METALLURGY CO Ltd
Current assignee: Guangdong Dong Mu new material Co., Ltd
Priority date: 2011-08-31
Filing date: 2011-08-31
Publication date: 2013-04-10
Anticipated expiration: 2031-08-31
Also published as: CN102303223A

Abstract

The invention discloses a process flow for machining a lower punching die. A process head is reserved in the process of machining the lower punching die, so that deformation produced at the relatively thin position of the wall of the die due to stress in the machining process is effectively reduced, waste produced by scrapping due to high deformation in the machining process of the die is avoided, the machining precision of the die is greatly improved, the production efficiency can be effectively improved, and the waste is reduced.

Description

A kind of undershoot process flow for processing mould

Technical field

The present invention relates to a kind of mould, particularly relate to a kind of processing process of lower stamping die.

Background technology

Existing mold production process is generally as follows: car → mill mark → numerical control marking → brill → heat treatment → corase grind → slow wire feeding, line cutting → electric spark → slow wire feeding → electric spark → bedding-in, the leading portion operation has respectively car, bores, mills and grinds, back segment operation electric spark, numerical control mill and fast, slow line cutting, grinding etc.After finishing complicated curved surface and aperture operation, the depth of parallelism of face shape requires to reach 10 ~ 5 μ m, and the required precision of aperture is controlled to be 1 ~ 5 μ m, to guarantee the quality of mould.Be the high chromium cold work tool steel of SLD high abrasion at used drift material; heat treatment take application of vacuum when main; to some mould; mould such as the undershoot under three on the flange type one; conventional structure is thinner in platelet position wall ratio, in the cutting on line process because the impact that is subjected to effect of stress often can have the phenomenon of distortion, thereby cause die deformation to be scrapped; have a strong impact on the efficient of production, also cause the waste of resource.

Summary of the invention

In order to overcome the deficiencies in the prior art, the present invention proposes a kind of undershoot process flow for processing mould, in process, keep a technique head in the thinner platelet position of mold wall thickness, to avoid or to alleviate the distortion of drift in process.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of undershoot process flow for processing mould, it comprises following processing step:

1) blanking: the high chromium cold work tool steel of the high abrasion blank of selecting to be of a size of ф 100*147mm is processed;

2) turner order: blank is carried out the turner order, process by drawing the profile of mould, and to remain with thickness at mould ф 80*5 place outer wall be that 3 ~ 4mm, width are the technique head of 2 ~ 5mm, the ф 80*5 place of lower stamping die is the thinner platelet place of wall thickness, keeps technique head and can prevent effectively that platelet is in the following manufacturing procedure and deform;

3) line: adopt by drawing scoring tool underlining Working position and shape on mould;

4) boring: adopt drilling machine to leave fabrication hole at mould by the underlining of previous step;

5) heat treatment: mould is heat-treated, make the hardness of mould reach Rockwell hardness 57-59;

6) line cutting roughing: the requirement with reference to drawing is carried out line cutting roughing to mould, and the monolateral allowance for finish that stays 0.5 ± 0.10mm prevents that mould is out of shape because machining stress is excessive;

7) spark machined; Requirement with reference to drawing is carried out spark machined to mould, the allowance that an operation stays on the ablation, mould roughing is arrived the size of drawing requirement by spark machined, and greatly reduce the stress of process, reduce the distortion of mould and the situation of damage;

8) line cutting fine finishining: mould is carried out line cutting fine finishining, lower stamping die accurately is worked into the concrete size of design drawing requirement;

9) turner order: the lower stamping die after the line cutting fine finishining is carried out the turner order, the technique head of reserving is removed;

10) mill: to each surfacing of mould of finishing cutting size to drawing requirement;

11) electric spark: the end face each several part by the spark machined mold and punching head is to the size of drawing requirement;

12) grind: grind on the surface to mould, makes the roughness of die surface less than 0.1mm, finishes processing.

The invention has the beneficial effects as follows: the lower stamping die that adopts this technological process to process, owing in the turner order of beginning, having kept technique head, the thinner platelet position of wall thickness is in the process of following process has avoided moderate finite deformation, and the concentricity that can make the mould that processes be controlled at less than 0.015mm among a small circle in, greatly improved the machining accuracy of mould, avoided mould and in process, scrapped the wasting phenomenon that causes because of distortion.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the mould structure schematic diagram that the present invention keeps technique head.

The specific embodiment

With reference to Fig. 1, the invention discloses a kind of undershoot process flow for processing mould, wherein a kind of step of lower stamping die is as follows to adopt technological process of the present invention processing: 1) blanking: the SLD tool steel blank of selecting to be of a size of ф 100*147 is processed; 2) turner order: blank is carried out the turner order, process by drawing the profile of mould 1, keep technique head 11 at ф 80*5 place by technological requirement, wherein the thickness of technique head 11 is 3 ~ 4mm, width is 2 ~ 5mm, and technological parameter processing on the design drawing is pressed in all the other places; 3) line: by drawing underlining Working position and shape on mould 1; 4) boring: by drawing and each fabrication hole of mould 1 processing technology requirement processing; 5) heat treatment: mould 1 is heat-treated; 6) line cutting roughing: the requirement with reference to drawing is carried out line cutting roughing, the monolateral allowance for finish that stays 0.5+0.10 to mould 1 and two undershoot cooperation places; 7) spark machined: mould 1 is carried out spark machined, the allowance that an operation is reserved on the ablation; 8) line cutting fine finishining: mould 1 is carried out line cutting fine finishining, mould 1 accurately is worked into the concrete size of design drawing requirement; 9) turner order: the mould 1 after the line cutting fine finishining is carried out the turner order, the technique head 11 of reserving is removed; 10) mill: will finish mould 1 each surfacing of cutting to the size of drawing requirement; 11) electric spark: the end face each several part by electrical spark working tool and mould 1 drift is to the size of drawing requirement; 12) grind: grind on the surface to mould 1, makes the roughness on mould 1 surface less than 0.1mm, finishes processing.

The lower stamping die that adopts this technological process to process, owing in the turner order of beginning, having kept technique head 11, the thinner platelet position of mould 1 wall thickness is in the process of following process has avoided moderate finite deformation, and the concentricity that can make the mould 1 that processes be controlled at less than 0.015mm among a small circle in, greatly improved the machining accuracy of mould 1, avoided mould 1 and in process, scrapped the wasting phenomenon that causes because of distortion.

The above only is preferential embodiment of the present invention, as long as realize that with basic identical means the technical scheme of the object of the invention all belongs within protection scope of the present invention.

Claims

1. undershoot process flow for processing mould is characterized in that it comprises following processing step:

1) blanking: be that 0.5 ~ 2 the high chromium cold work tool steel of high abrasion blank is processed in the size Selection ratio of drawings marked;

2) turner order: blank is carried out the turner order, processes by drawing the profile of mould (1), and the outer surface at mould (1) ф 80*5 place to remain with thickness be that 3 ~ 4mm, width are the technique head (11) of 2 ~ 5mm;

3) line: adopt by drawing scoring tool in the upper underlining Working position of mould (1) and shape;

4) boring: adopt drilling machine to leave fabrication hole at mould (1) by the underlining of previous step;

5) heat treatment: mould (1) is heat-treated, make the hardness of mould (1) reach Rockwell hardness 57-59;

6) line cutting roughing: the requirement with reference to drawing is carried out line cutting roughing, the monolateral allowance for finish that stays 0.5 ± 0.10mm to mould (1);

7) spark machined; Requirement with reference to drawing is carried out spark machined to mould (1), the allowance that an operation stays on the ablation;

8) line cutting fine finishining: mould (1) is carried out line cutting fine finishining, lower stamping die accurately is worked into the concrete size of design drawing requirement;

9) turner order: the lower stamping die (1) after the line cutting fine finishining is carried out the turner order, the technique head (11) of reserving is removed;

11) electric spark: the end face each several part by electrical spark working tool and mould (1) drift is to the size of drawing requirement;

12) grind: grind on the surface to mould (1), finishes processing.

2. a kind of undershoot process flow for processing mould according to claim 1 is characterized in that: in the step 12), to mould (1) surface grind make mould (1) surface roughness less than 0.1mm.