CN101526449B

CN101526449B - Handheld grinding pan

Info

Publication number: CN101526449B
Application number: CN2009100110458A
Authority: CN
Inventors: 陈春焕; 王国顺; 任瑞铭; 赵秀娟
Original assignee: Dalian Jiaotong University
Current assignee: Dalian Jiaotong University
Priority date: 2009-04-03
Filing date: 2009-04-03
Publication date: 2010-12-08
Anticipated expiration: 2029-04-03
Also published as: CN101526449A

Abstract

The invention provides a handheld grinding pan and a use method thereof and is used for grinding transmission electron microscope film samples. The handheld grinding pan is provided with an object stage, a fixed ring, a bearing and a balance weight; a sample is stuck to the bottom of the object stage by modified wax, and the object stage can move up and down in the fixed ring; when the handheld grinding pan is in grinding, the jacket of the bearing is held by the hand of a person; because friction action exists between the fixed ring and a grinding platform of a grinding and polishing machine, the fixed ring is driven by the grinding platform to passively rotate and further drives the object stage and the sample to rotate so as to obtain the ground sample with higher parallelism and planarity; meanwhile, the bottom periphery of the fixed ring is provided with a liquid guide groove so as to ensure that a material to be ground smoothly passes by and reaches the ground sample, the material can be stirred and recycled under the passive rotation, the loss of the material due to the centrifugal effect is reduced and the material is ground with high efficiency and high quality. The grinding pan can be also used for grinding common metallographic samples and has the advantages of simple operation, high efficiency, practicability, low price, and the like.

Description

Handheld grinding pan

Technical field

The present invention relates to a kind of hand-held lapping device, be specially adapted to the pre-attenuate stage of machinery in the transmission electron microscope sample making course.This device is applicable to the grinding and the polishing of common metallographic specimen too.

Background technology

It is big and evenly and unmanned thin (electron beam is transparent) district for defective that desirable transmission electron microscope film sample requires to have area, preparing such sample will be through the attenuate of multiprogramming, the general first step is the pre-attenuate (grinding) of machinery, just can carry out next step attenuate after requiring to be ground to about 30 μ m at least, so mechanical lapping is one of committed step of transmission electron microscope film sample preparation.

Easy way the thick thin slice of well cutting～0.5mm with on the gluing carrier (such as rubber, derby etc.) that is affixed on big plane of rapid hardening; on sand paper or grinding and polishing machine, grind by hand; because all even direction of manual firmly very difficult control is stable; usually (promptly ground do not had partially by one side for mill; and another side is also thicker) or the mill injustice; particularly for the sample that has the specific region to need protection, as hold and badly probably the part that will protect is ground off, success ratio reduces greatly.After sample mill was inclined to one side, though very thin by the inclined to one side side of mill, this thin district was got by mechanical lapping, probably has mechanical damage and artificial defect, is not necessarily suited for transmission electron microscope observing.

The unit that has uses simple and easy lapping device sample preparation as shown in Figure 3, sample is pasted on the objective table below, last lower nut can be locked the height with the location sample mutually, on sand paper or grinding and polishing machine, grind then, its grinding effect with stick on derby or rubber on the same, also mill is inclined to one side easily, and the depth of parallelism of gained sample and flatness all are difficult to guarantee.In addition, the lower nut bottom periphery is not slotted, and when grinding on the grinding and polishing machine and polishing, abrasive material can than difficult arrival sample, reduce grinding efficiency in the periphery by the lower nut retaining.

Therefore, for a lot of Electronic Speculum workers, not only cheap but also efficient, practical abrasive disk is in demand.

Summary of the invention

The objective of the invention is at hand-ground in above-mentioned Electronic Speculum and the metallographic sample preparation process easily mill partially, the depth of parallelism and flatness all are difficult to the shortcoming that guarantees, design the hand-ground dish of a kind of cheapness and highly effective.This abrasive disk both can grind electron microscopic sample also can grind common metallographic samples, both can grind on sand paper by hand, also can be placed on the grinding and polishing machine and grind and polish, and the depth of parallelism of gained sample and flatness are all higher.

Handheld grinding pan of the present invention, comprise that objective table and objective table are fixed, hand-held device, described objective table periphery disposes set collar, bearing and counterweight, counterweight loads on the objective table top by support bar, support bar is connected with the surface level central point of objective table, the bearing encapsulation is in set collar top, and objective table is nested in set collar inside and can moves up and down in the hole of set collar, and set collar, objective table and bearing inner sleeve can rotate freely together.Its assemble sequence as shown in Figure 1.During use, be pasted on the objective table below by ground sample.

Around below the set collar of described handheld grinding pan, have intake chute.Its effect is to guarantee that abrasive material by playing ablation to arrive sample, plays stirring and recovery effect to abrasive material in addition in rotary course, reduces the centrifugal loss of abrasive material.

The surface level central point of above-mentioned support bar and objective table is for being threaded, but is not limited thereto connected mode, can use the alternate manner that can reach result of use to connect equally.

The using method of handheld grinding pan is:

1) sample is pasted sample to be ground is pasted on the objective table below;

2) by behind assemble sequence shown in Figure 1 such as the well hand-held abrasive disk of above-mentioned assembled in sequence, place on the grinding plate of grinding and polishing machine and grind, utilize the counterweight pressurization to guarantee that pressurization steadily, utilize the guide effect of set collar to guarantee that compression aspect is all the time perpendicular to grinding plate, hand-held bearing outside can rotate to guarantee set collar and sample, guarantees the flatness and the depth of parallelism of institute's grind away product by turning effort; Utilize intake chute to guarantee abrasive material, and in its rotary course, abrasive material stirred and promote abrasive material to be evenly distributed and taking back the platform middle part because centrifugation is thrown to the abrasive material at grinding plate edge smoothly by arriving sample.

The sticking obedient process of described sample is that the modified paraffin that utilizes fusing point to be lower than 100 ℃ is pasted on the objective table bottom to sample to be ground.Utilize the low melting point and the low-intensity of paraffin, can limit in the process of lapping intense mechanical effect, lower process of lapping and introduce the new damage or the degree of defective sample.

Description of drawings

The present invention has accompanying drawing 10 width of cloth,

Fig. 1 handheld grinding pan wiring layout;

Fig. 2 assemble sequence and assembling design sketch;

The simple and easy lapping device of Fig. 3;

Fig. 4 set collar;

Fig. 5 objective table;

Fig. 6 support bar;

Fig. 7 counterweight;

The transmission electron microscope photo of Fig. 8 institute grind away product;

The metallograph of Fig. 9 gained sample;

Figure 10 does not have bearing assembling.

Sample in the drawings, 1, objective table, 2, set collar, 3, bearing, 4, counterweight, 5, support bar, 6, bearing inner sleeve, 7, intake chute, 8, top nut, 9, lower nut, 10.

Embodiment

Handheld grinding pan to the application is elaborated below with reference to accompanying drawings.But, the material of the component parts of being recorded and narrated in the following embodiment, size, shape etc., if the description that is not particularly limited does not then constitute limiting the scope of the invention, and nothing but simple illustrated example.

Embodiment 1

For guaranteeing wearing quality and corrosion stability, set collar is selected martensitic stain less steel 4Cr13 for use, presses Fig. 4 machine work earlier, 1020 ℃ of vacuum hardenings then, and 350 ℃ of tempering get final product then.

Objective table and counterweight and counterweight support bar do not have the wearing quality requirement, select 304 austenitic stainless steels for use, press Fig. 5～Fig. 7 processing and get final product.

According to the size of set collar, select common 6008-2RS deep groove ball bearing for use, this bearing bilateral band sealing shroud can prevent that abrasive material and liquid from entering bearing and causing wearing and tearing and corrosion.If consider the rust-preventing characteristic of bearing, can select stainless steel bearing for use, but cost can increase slightly.

After above-mentioned parts is ready to, be handheld grinding pan of the present invention by assembling shown in Figure 2.The cost of this abrasive disk single-piece production (comprising fee of material and processing charges) is 350～400 yuans.As producing in batches, cost can further reduce.

Example 1

Utilize abrasive disk of the present invention to carry out the mechanical lapping of electron microscopic sample, behind mechanical lapping to the 30 μ m, carried out again that pit grinds and ion milling, the electromicroscopic photograph of sample as shown in Figure 8, the thin district on the gained sample is big and evenly.

Example 2

Utilize abrasive disk of the present invention to prepare metallographic sample, its metallographic structure photo as shown in Figure 9, the surface planarity of gained sample is higher.

Need to prove: abrasive disk of the present invention is when pressing assembled in sequence shown in Figure 1, and when grinding on the grinding and polishing machine, sample rotates in process of lapping.If do not wish the sample rotation, perhaps on sand paper, grind by hand, then running in bearings does not get final product (wiring layout is seen Figure 10).Also can manual mode pressurize, need take away counterweight and support bar this moment, pushes down the objective table top with finger during grinding and get final product.

Claims

1. handheld grinding pan, comprise that objective table (1) and objective table fix, hand-held device, it is characterized in that: described objective table periphery disposes set collar (2), bearing (3) and counterweight (4), counterweight (4) loads on the objective table top by support bar (5), support bar is connected with objective table (1), bearing (3) encapsulation is in set collar (2) top, be pasted on the objective table below by ground sample, objective table (1) is nested in set collar (2) inside and can moves up and down set collar (2) in the hole of set collar (2), objective table (1) and bearing inner sleeve (6) can rotate freely together.

2. according to the handheld grinding pan described in the claim 1, it is characterized in that: around the below of set collar (2), have intake chute (7).

3. according to the handheld grinding pan described in the claim 1, it is characterized in that: described support bar (5) and objective table (1) are for being threaded.