CN201895255U

CN201895255U - Groove millstone structure for processing miniature steel balls

Info

Publication number: CN201895255U
Application number: CN2010205917527U
Authority: CN
Inventors: 林钟杰; 张红路
Original assignee: Wenzhou longwan shacheng steel ball factory
Current assignee: Wenzhou longwan shacheng steel ball factory
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2011-07-13
Anticipated expiration: 2020-11-04

Abstract

The utility model relates to a groove millstone structure for processing miniature steel balls, which comprises an upper disk, a lower disk and the steel balls. The upper surface of the lower disk is provided with a plurality of V-shaped grooves; the steel balls are placed in the V-shaped grooves; and the angle of each V-shaped groove is 75 degrees. By the aid of the groove millstone structure and the 75-degree angle grooves, stress of the steel balls is changed, scrapping can be decreased, and processing speed and stability are improved.

Description

The groove mill structure that the processing miniature iron shot is used

Technical field

The utility model relates to a kind of groove mill structure that miniature iron shot is used of processing.

Background technology

At military industry field, the miniature bearing that needs a large amount of aperture≤1mm, and these miniature bearings just the ball of the various material such as army's first steel, non-magnetic alloy, stainless steel of needs≤0.8mm match with it, referring to Fig. 1, the flat board of using for the processing miniature iron shot grinds structure, comprise dish, lower wall and steel ball, steel ball places lower wall and goes up between the dish, this structure tends to exist following problem in the process of processing: 1, because the ratio of heat capacities of steel ball is less, the quenching size is often bigger, so its allowance is bigger, the process-cycle is long; 2, Jia Gong qualification rate is lower, and main cause is that the attrition process amount is bigger, and it is quite a lot of to change the number of times that grinds template, as long as do not note slightly, or has sand holes etc. on the mill, all can cause the steel ball defective and causes and scrap, and processing has a big risk; 3, grinding rate is slow, especially for the ball base of non-magnetic alloy and stainless steel, generally grinds the 1-2 silk every day.

The utility model content

For addressing the above problem the groove mill structure that the processing miniature iron shot that the utility model provides a kind of energy minimizing to scrap, improve process velocity and stability is used.

The groove mill structure that processing miniature iron shot of the present utility model is used comprises dish, lower wall and steel ball, offers a plurality of V-grooves on the upper surface of described lower wall, and steel ball is placed in the described groove, and the gash angle of described V-groove is 75 degree.

The beneficial effect of the groove mill structure that the utility model processing miniature iron shot is used is: the utility model adopts groove mill structure, and gash angle is 75 °, and the stressed of steel ball changed, and can reduce and scrap, and has improved process velocity and stability.

Description of drawings

Fig. 1 is the structural representation of dull and stereotyped mill structure;

Fig. 2 is the schematic diagram of the groove mill structure used of the utility model processing miniature iron shot;

Fig. 3 is the process principle figure of steel ball in the ditch slotted disk;

Schematic diagram when Fig. 4 is the abrasive disk inefficacy;

Fig. 5 is the force analysis figure of trench wall;

Fig. 6 is the force analysis figure of invention forecourt and bottom land;

Fig. 7 is the force analysis figure of invention back ball and bottom land;

Fig. 8 is the schematic diagram of selecting for use of mill opening mode.

The specific embodiment

The groove mill structure of the utility model processing miniature iron shot being used below in conjunction with Figure of description is described further.

Referring to Fig. 2, the groove mill structure that processing miniature iron shot of the present utility model is used comprises dish 1, lower wall 2 and a plurality of steel ball 3, offers a plurality of V-grooves 21 on the upper surface of lower wall 2, steel ball 3 is placed on respectively in the V-groove 21, and the gash angle of V-groove is 75 °.

Referring to Fig. 3, Fig. 5, every steel ball all has been subjected to 3 power in groove, because the groove both sides are for the mill pivot, its distance is all different, and promptly the outside is R1 to the center, and inner edge is R2 to the center, because the centre distance difference then produces linear differential:

Linear differential=V1-V2=2 π R1n-2 π R2n (n is a speed of grinding plate in the formula)

Because under the normal pressure of upper millstone, steel ball does not produce slip in groove, and revolve round the sun around the pivot of mill, existing linear differential on the contact point inside and outside steel ball and the lower millstone groove, thereby itself does rotation steel ball, owing to produce revolution and rotation simultaneously, then the circularity of steel ball is guaranteed, simultaneously, and between mill groove and steel ball, owing to added abrasive material, thereby when relativity, produce the size that friction consumes steel ball and groove, when situation about occurring as shown in Figure 4, owing to can not produce rotation, revolution (during rolling) be can only produce and inefficacy, hull again ground.

Referring to Fig. 6, original mill structure, the angle between the mill groove bottom land both sides is 90 °, ball and bottom land distance H=0.5D/sin45 °-0.5D ≈ 0.2D (D is the diameter of processed steel ball in the formula) after the pitching,

fx＝N/2*sin45°*cos45°＝0.25N

fy＝N/2*cos45°*cos45°＝0.25N

Referring to Fig. 7, in the groove mill structure that processing miniature iron shot of the present utility model is used, angle between the mill groove bottom land both sides is 75 °, the distance H=0.5D/sin37.5 of ball and bottom land °-0.5D ≈ 0.32D (D is the diameter of processed steel ball in the formula) after the pitching

fx＝N/2*cos37.5°*cos37.5°＝0.3147N

fy＝N/2*cos37.5°*sin37.5°＝0.18N

Because the angle between the groove bottom land both sides is 75 degree, with respect to lower millstone, the pressure of its downward y axle reduces, and the x axle power of ball and Pan Gou increases, so also prolonged the service life of mill.

By data car abrasive disk of the present utility model, close up even be ground to up and down, its channel bottom also has the space, so it is quite sufficient to the rotation of steel ball, so can never be influential to steel ball circularity.

Early grind is used three oxidations two tunnel of dyestuff level instead and is added that the W5 diadust circulates with aqua.

The single-minded W1 diadust of using, the processing of circulation aqua

Smart dual-purpose W0.5 diadust, the aqua cyclic process.

Referring to shown in Figure 8, be selecting for use of mill opening mode:

The following steel ball of processing 0.8mm, general opening size is at 100mm, but during the following ball of processing 0.7mm, opening size L is suitable littler, the depth that can guarantee its effective vent L scope internal channel like this is consistent as far as possible, and the diameter phase mutual deviation that caused of inside and outside line of rabbet joint speed difference, makes inside and outside steel ball roll, intersect even relatively, ensure the quality of products, be advisable so general opening size L gets 50mm-60mm.

Efficiency by inputoutput test (every pair of dish amount of grinding)

Specification	Ball base size	Material	Amount of grinding before the invention	Invention back amount of grinding
					0.50mm	0.65	9Cr18	0.03mm	0.05mm
0.68mm	0.90	9Cr18	0.04mm	0.06mm
					0.68mm	0.90	ZGCr15	0.06mm	0.10mm

The characteristics of the groove mill structure that the utility model processing miniature iron shot is used are: 1, make full use of existing equipment, process special small-sized steel ball, efficient improves more than 50%, steady quality.2, need not invest, improve processing stability greatly, (changing dish less) reduces labor intensity; 3, reach the requirement of G10 steel ball quality fully.

Above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection domain of claims of the present utility model.

Claims

1. process the groove mill structure that miniature iron shot is used for one kind, comprise dish, lower wall and steel ball, it is characterized in that: offer a plurality of V-grooves on the upper surface of described lower wall, steel ball is placed in the described V-groove, and the gash angle of described V-groove is 75 degree.