CN215919338U

CN215919338U - Split type electrode for processing asymmetric DPF mold

Info

Publication number: CN215919338U
Application number: CN202121756817.3U
Authority: CN
Inventors: 朱雪艳; 冯家迪
Original assignee: JIANGSU PROVINCE YIXING NONMETALLIC CHEMICAL MACHINERY FACTORY CO Ltd
Current assignee: JIANGSU PROVINCE YIXING NONMETALLIC CHEMICAL MACHINERY FACTORY CO Ltd
Priority date: 2021-07-23
Filing date: 2021-07-29
Publication date: 2022-03-01
Anticipated expiration: 2031-07-29

Abstract

The application discloses a split type electrode for processing an asymmetric DPF (diesel particulate filter) die, which consists of an X-direction electrode and a Y-direction electrode; the X-direction electrode at least comprises an X-direction electrode unit, and the Y-direction electrode at least comprises a Y-direction electrode unit; when the asymmetrical DPF die is used, the X-direction electrode units are matched with the corresponding Y-direction electrode units to form shapes corresponding to the shapes of the groove surfaces of the asymmetrical DPF die. The split XY electrode is designed for processing the groove surface of the die, the electrode processing equipment is multiple, the electrode material selection range is wide and low in cost, the processing is more convenient, the efficiency is higher, the processing period is short, the processing cost is lower, the narrow slit processing is not easy to deform and other advantages, the roughness of the inner wall of the groove can reach Ra1.0, the requirement of forming extrusion is met, and the practicability is good.

Description

Split type electrode for processing asymmetric DPF mold

Technical Field

The invention belongs to the technical field of non-metallic ceramic materials, and particularly relates to a split type electrode for processing an asymmetric DPF die.

Background

The groove surface of the existing straight-through honeycomb ceramic carrier die can be processed by adopting methods such as linear cutting or grinding wheel cutting. The asymmetric DPF die is not linear due to the distribution of large and small holes, cannot adopt methods such as linear cutting or grinding wheel cutting, and can only be finished by adopting an electric discharge machining method. The EDM is a common EDM machine, which uses an electric spark forming machine such as adik, GF, etc., and the EDM uses an electrode to discharge electricity, and the shape of the machined part is the same as that of the electrode. Electrical discharge machining, the electrode is critical. Different electrode materials and processing techniques have different influences on the processing quality, the processing cost and the processing efficiency of the die. The existing electrode processing method generally adopts linear cutting processing to cut out a square hole electrode for electric discharge processing. The existing integral electrode only adopts red copper or copper-tungsten alloy, the material price is high, wire cutting processing needs to process a plurality of wire penetrating holes in advance, and wire penetrating needs to be carried out again when one square hole is cut. The processing efficiency is very low. Moreover, the processing narrow gap of the red copper or the copper-tungsten alloy is easy to deform. The use requirement of the groove surface for processing the asymmetric DPF mould cannot be completely met.

Disclosure of Invention

To the not enough among the prior art, the technical problem that this application will solve provides a split type electrode for processing asymmetric DPF mould, has and processes more conveniently, and efficiency is higher, advantages such as processing cycle is short.

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

the split type electrode for processing the asymmetric DPF mold consists of an X-direction electrode and a Y-direction electrode; the X-direction electrode at least comprises an X-direction electrode unit, and the Y-direction electrode at least comprises a Y-direction electrode unit; when the asymmetrical DPF die is used, the X-direction electrode units are matched with the corresponding Y-direction electrode units to form shapes corresponding to the shapes of the groove surfaces of the asymmetrical DPF die.

The X-direction electrode unit comprises an electrode main body extending in the X direction, and upward protrusions and downward grooves are arranged on the electrode main body at intervals.

The Y-direction electrode at least comprises a Y-direction electrode unit, the Y-direction electrode unit comprises a Y-direction electrode main body extending in the Y direction, and a left bulge and a right bulge are arranged on the Y-direction electrode main body at intervals.

When the split type electrode for processing the asymmetric DPF mold is used, the X-direction electrode unit is matched with the corresponding Y-direction electrode unit, and the adjacent upward bulge and downward groove are combined with the adjacent leftward bulge and rightward bulge to form a shape corresponding to the shape of the groove surface of the asymmetric DPF mold.

Convex points extending outwards are arranged at the corners of the upward bulges and the downward grooves.

The split type electrode for processing the asymmetric DPF mould is made of conductive copper-tungsten alloy and graphite.

Has the advantages that: compared with the prior art, the split type XY electrode is easy to machine, the number of machining devices is large, the electrode machining method can be machined through CNC, the machining devices can be used for machining CNC machining devices such as centers, the electrode material selection range is wide, conductive materials such as copper-tungsten alloy can be used, electrode materials such as graphite can be selected for use, the graphite electrode has the advantages of being lower in material cost, more convenient to machine, higher in efficiency, short in machining period, lower in machining cost, not prone to deformation during narrow-slit machining and the like. The roughness of the inner wall of the processed die groove can reach Ra1.0, and the molding extrusion requirement is met.

Drawings

FIG. 1 is a schematic diagram of an asymmetric DPF product pore structure;

FIG. 2 is a schematic diagram of an asymmetric DPF mold structure;

FIG. 3 is a schematic view of an asymmetric DPF mold land and tooth post fillet;

FIG. 4 is a schematic diagram of an X-direction electrode structure of a split type asymmetric DPF die

FIG. 5 is a structural schematic diagram of a Y-direction electrode of a split type asymmetric DPF die;

FIG. 6 is a schematic view of an assembled asymmetric DPF electrode machining area.

Detailed Description

The present application is further described with reference to specific examples.

A diesel vehicle six post-treatment soot particulate filter is a DPF honeycomb ceramic carrier with an asymmetric structure. The product has a common hole density model of 300-9 and 300-7, a model of 300-9, namely 300 holes/square inch, a wall thickness of 9mil (0.229mm), a model of 300-7, namely 300 holes/square inch, and a wall thickness of 7mil (0.178 mm). The product is generally cylindrical, the diameter of the end face is in the range of 150-. The common diameter specification is 7.5 ' (190.5mm), 9 ' (228.6mm), 10.5 ' (266.7 mm), 12 ' (304.8mm) and 13 ' (330.2mm), the product square holes are in asymmetric design, the length ratio of the sides of the square holes of the large holes and the small holes is 1.2-1.4, preferably 1.25-1.35, as shown in figure 1.

The main structure of the asymmetric DPF mould for preparing the DPF honeycomb ceramic carrier with the asymmetric structure is similar to that of a straight-through SCR (selective catalytic reduction) and DOC (diesel engine) honeycomb ceramic carrier mould. The structure is shown in figure 2, and is a whole template 1, and the back is processed and is had numerous evenly distributed feed port 2, and the front is processed numerous evenly distributed blown down tank 3, and blown down tank 3 and feed port 2 link up. The discharging groove 3 is composed of two types of tooth columns with different sizes, specifically a large-size square tooth column 4 and a small-size square tooth column 5, wherein the side length ratio of the large-size square tooth column 4 to the small-size square tooth column 5 is 1.2-1.4, and preferably 1.25-1.35. This application all is equipped with the fillet in the corner of the square tooth post of jumbo size 4 and the square tooth post of small-size 5, adopts the fillet design, has avoided the closed angle to interfere, also can effectively improve the terminal surface fracture defect when the product burns till. However, too large a radius results in a reduced through-hole area and increased back pressure. Therefore, a reasonable fillet range needs to be designed. Wherein, the fillet R of the large-size square tooth column ranges from 0.16 mm to 0.25mm, preferably 0.20mm, and the fillet R of the small-size square tooth column ranges from 0.09 mm to 0.15mm, preferably 0.13mm (figure 3).

The method for preparing the asymmetric DPF mould comprises the following steps:

1) manufacturing a template blank by using die steel or other alloy steel;

2) programming a feeding hole drilling program, and then drilling a hole by a numerical control deep hole drill; typical drilling procedures include one drilling process and two bottom hole cleaning processes; the primary drilling process comprises the following steps: drilling with a common gun drill, wherein the drilling depth is 0.3-0.5mm smaller than the final processing depth, and the bottom of the drilled hole is W-shaped; the twice bottom hole cleaning process comprises a first bottom hole cleaning process and a second bottom hole cleaning process, wherein the first bottom hole cleaning process is as follows: processing by using a first hole cleaning gun drill with special grinding, wherein the drilling depth is equal to the drilling depth, and removing the middle bulge of the W-shaped hole bottom; the second bottom hole cleaning process comprises the following steps: processing the hole bottom into a V shape by using a second hole cleaning gun drill with special grinding;

3) and manufacturing an electric machining electrode, programming an electric discharge machining program and machining the groove surface of the discharge groove.

Different from a straight-through type honeycomb ceramic carrier mold, the asymmetric DPF mold has a groove surface with large and small holes. Namely, the tooth columns are distributed in a staggered way of large squares and small squares, as shown in fig. 3. The groove surface of the straight-through honeycomb ceramic carrier die can be processed by adopting methods such as linear cutting or grinding wheel cutting and the like. The asymmetric DPF die has the defects that the grooves are not in a straight line due to the distribution of large and small holes, and the methods such as linear cutting or grinding wheel cutting cannot be adopted. The method for processing the groove surface of the die generally adopts EDM (electrical discharge machining). EDM electrical discharge machining equipment is an electrical discharge machine such as Sadick, GF, etc. In the electric discharge machining, electric discharge is performed by an electrode, and the shape of a machined part is the same as that of the electrode. Electrical discharge machining, the electrode is critical. Different electrode materials and processing techniques have different influences on the processing quality, the processing cost and the processing efficiency of the die.

The electrode is usually machined by wire cutting to form a square hole and then discharge machining. The conventional integral electrode only can adopt red copper or copper-tungsten alloy, the material price is higher, wire cutting processing needs to process a plurality of wire penetrating holes in advance, and wire penetrating needs to be carried out again when one square hole is cut. The processing efficiency is very low. Moreover, the processing narrow gap of the red copper or the copper-tungsten alloy is easy to deform.

The application adopts an innovative XY two-direction split type electrode processing scheme. The specific electrodes are shown in fig. 4 and 5. The X-direction electrode at least comprises an X-direction electrode unit, the X-direction electrode unit comprises an X-direction electrode main body X1 extending in the X direction, and an upward protrusion X2 and a downward groove X3 are arranged on the X-direction electrode main body X1 at intervals; the Y-direction electrode at least comprises a Y-direction electrode unit, the Y-direction electrode unit comprises a Y-direction electrode main body Y1 extending in the Y direction, and a left protrusion Y2 and a right protrusion Y3 are arranged on the Y-direction electrode main body Y1 at intervals; when the X-direction electrode unit X1 is used, the X-direction electrode unit X1 is matched with the corresponding Y-direction electrode unit Y1, the adjacent upward protrusion X2 and downward groove X3 are combined with the adjacent leftward protrusion Y2 and rightward protrusion Y3, and the end face shapes corresponding to the large-size square tooth column and the small-size square tooth column are formed. In addition, a convex point X4 extending outward may be provided at a corner of the protrusion X2 and the downward groove X3.

By adopting the method, the electrode machining can be realized by CNC machining, and the machining equipment is CNC machining equipment such as a machining center and the like. The electrode material has more selection range, and can be selected from conductive copper-tungsten alloy and other materials, and can also be selected from graphite and other electrode materials. The graphite electrode has the advantages of lower material cost, more convenient processing, higher efficiency, short processing period and lower processing cost. Narrow slit processing is not easy to deform, and the like. The roughness of the inner wall of the groove can reach Ra1.0, and the requirement of molding and extrusion is met.

When the groove surface is specifically processed, as shown in fig. 6, the whole groove surface can be divided into 8 or more than 8 parts (divided into 1, 2, 3, 4, 5, 6, 7 and 8 regions) according to the X direction and the Y direction, and the groove surfaces are processed in the regions respectively and successively, so that the whole effect is finally formed.

After the groove surface of the discharge groove is processed, the discharge groove can be directly used for producing target products. In order to prolong the service life of the die and improve the quality of a target product, the subsequent processing steps such as surface coating and the like can be carried out on the die by adopting a conventional method.

Claims

1. The split type electrode for processing the asymmetric DPF die is characterized by consisting of an X-direction electrode and a Y-direction electrode; the X-direction electrode at least comprises an X-direction electrode unit, and the Y-direction electrode at least comprises a Y-direction electrode unit; the X-direction electrode unit comprises an electrode main body (X1) extending in the X direction, and upward protrusions (X2) and downward grooves (X3) are arranged on the electrode main body (X1) at intervals; the Y-direction electrode unit comprises a Y-direction electrode main body (Y1) extending in the Y direction, and a left protrusion (Y2) and a right protrusion (Y3) are arranged on the Y-direction electrode main body (Y1) at intervals.

2. The split electrode for manufacturing asymmetric DPF mold according to claim 1, wherein outwardly extending protrusions (X4) are provided at the corners of the upward protrusions (X2) and the downward grooves (X3).

3. The split electrode for machining asymmetric DPF mold as claimed in claim 1, wherein the electrode material is conductive Cu-W alloy and/or graphite.