CN203489820U

CN203489820U - Standard rod used for large diameter measurement

Info

Publication number: CN203489820U
Application number: CN201320564326.8U
Authority: CN
Inventors: 吴伟伟; 韩士强; 仲嘉嘉
Original assignee: CSSC MES Diesel Co Ltd
Current assignee: CSSC MES Diesel Co Ltd
Priority date: 2013-09-11
Filing date: 2013-09-11
Publication date: 2014-03-19
Anticipated expiration: 2023-09-11

Abstract

A standard rod used for large diameter measurement comprises a rod body and two tip portions respectively fixed on two ends of the rod body; the tip portion is formed by a cone body and a measuring head; the big end of the cone body is fixedly connected with the rod body; the measuring head is in a ball coronary shape and fixedly connected on the small end of the cone body; the error range of the size L between the tops of the measuring heads of the two tip portions is from -0.003mm to +0.003mm. The standard rod used for large diameter measurement is high in measuring precision, safe and convenient in operation, and low in cost, has the benefit effects of improving efficiency and ensuring quality, is suitable for measuring large diameter parts, and especially suitable for measuring large diesel engine parts.

Description

A kind of master bar of measuring for large aperture

Technical field

The utility model relates to a kind of supplemental measurement tool, in particular a kind of master bar of measuring for large aperture, belongs to field of measuring technique.

Background technology

On heavy-duty machinery, in the process of heavy parts, often face the dimensional measurement problem of large diameter hole, as the cylinder-bore of marine low-speed diesel motor, because size is larger, therefore often shortage is both easy to operate, again the higher measurer of precision.Current measurement large aperture consumption has following several, and its feature and feature are as follows: 1, tape measure (2.5 meters, 5 meters, 10 meters of specifications ...), be mainly used in large-sized low precision measure, and its advantage is easy to carry, shortcoming is that measuring accuracy is poor; 2, ruler (specification 50mm, 200mm, 300mm, 500mm, 1000mm...), its advantage is higher than tape measure precision, and it is convenient to measure, and shortcoming is that measuring accuracy is still not high, the stressed rear yielding measuring accuracy that affects; 3, vernier caliper (specification 150mm, 200mm, 300mm, 600mm, 1000mm....), to be that measuring accuracy is the highest can reach 0.02mm to its advantage, and shortcoming is to need certain working experiences, and the difference of ergometry can affect measuring accuracy; 4, internal-and external diameter milscale, its advantage is that measuring accuracy is the highest, and shortcoming is to need skilled working experience, and each measurement all must be readjusted micrometer inside caliper before using, multiple to bar gage, and must remove the error amount of bar gage, operates very loaded down with trivial details.In addition, some heavy parts volumes of marine low-speed diesel motor are very huge, have or even several times of Human Height, therefore, when using conventional gauges, need to operate by step ladder, just there is certain potential safety hazard in this.

Utility model content

Technical problem to be solved in the utility model is the deficiency that overcomes existing various large apertures survey instrument, a kind of master bar of measuring for large aperture is provided, reach and improve the effect of measuring efficiency, reducing manufacture use cost and assurance product quality, meet better the needs of heavy parts processing.

The utility model is achieved through the following technical solutions:

A kind of master bar of measuring for large aperture, it comprises shaft and two top tip parts, this two top tip part is fixedly connected on respectively the two ends of described shaft, described top tip part is comprised of cone and measuring head, the large end of this cone is fixedly connected with described shaft, this measuring head is spherical crown shape, is fixedly connected on the small end of described cone, and between the top of described two top tip part measuring heads, the precision of size L is ± 0.003mm.

Described shaft is provided with labeling section, and this labeling section is a plane, shows the sign of size L above.

Two described top tip parts are through Quenching Treatment, more than hardness reaches HS=75.

The radius of spherical crown R=10mm of described measuring head, diameter D=5mm at the bottom of spherical crown.

Compared with prior art, the beneficial effects of the utility model are:

1, practical, swift to operate, convenient---because master bar is to make according to the workpiece size that will measure, there is fixing size, therefore, during measurement without adjusting, with respect to internal-and external diameter milscale, each measurement all needs to readjust before using, and multiple to size with bar gage, then removes the error amount in bar gage, operate very loaded down with trivial detailsly, the utility model operation is very easy.

2, the security that has improved operation, has reduced operating personnel's labour intensity---during the utility model operation, without ascending a height, avoided personal injury hidden danger.

3, having promoted product quality---measuring head of the present utility model is through grinding, and in reach ± 0.003mm of dimensional accuracy, so measuring accuracy can reach 0.01mm, and described master bar is provided with labeling section simultaneously, and the personnel maloperation of avoiding causes quality accident.

4, manufacture and later stage cost of upkeep are low---approximately 10～30 yuan of every costs.

In a word, the master bar of measuring for large aperture described in the utility model is used the simplest survey instrument to reach the measuring accuracy of peak demand, have advantages of that measuring accuracy is high, easy and safe to operate, with low cost, obtained the beneficial effect of raising the efficiency, ensuring the quality of products, be applicable to the measurement of large aperture part, be especially suitable for the measurement of large-sized diesel machine part.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the A-A cut-open view of Fig. 1.

Fig. 3 is the partial enlarged drawing of the utility model top tip part.

Fig. 4 is use constitutional diagram of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the master bar of measuring for large aperture described in the utility model is described in further detail, but can not limits protection domain of the present utility model with this.

Refer to Fig. 1, the master bar 01 that diagram is measured for large aperture comprises shaft 1 and two top tip parts 2.

The manufactured materials of described shaft 1 is common 45# steel, and the low easy processing of cost, can adopt lathe machine-shaping.Described two top tip parts 2 are fixedly connected on respectively the two ends of described shaft 1, and this two top tip part 2, through Quenching Treatment, more than hardness reaches HS=75, can improve wearing quality, increases the service life.Refer to Fig. 3, described top tip part 2 is comprised of cone 21 and measuring head 22, the large end of this cone 21 is fixedly connected with described shaft 1, and its outside diameter is identical with the diameter of shaft 1, described measuring head 22 is spherical crown shape, is fixedly connected on the small end of described cone 21, the radius of spherical crown R=10mm of this measuring head 22, diameter D=5mm at the bottom of spherical crown, at the bottom of the spherical crown of the end diameter of described cone 21 and this measuring head 22, diameter D is identical.The measuring head 22 of described two top tip parts 2 is through grinding, and makes the reach ± 0.003mm of precision of size L between the top of two measuring heads 22, higher than the precision of micrometer inside caliper.Incorporated by reference to consulting Fig. 1 and Fig. 2, described shaft 1 is provided with labeling section 3, and this labeling section 3 is a plane, shows the sign of unique fixing size L above, can effectively prevent that operator from misunderstanding the immeasurable loss that size causes.

Refer to Fig. 4, the described master bar 01 of measuring for large aperture is manufactured in advance according to the large diameter hole on workpiece for measurement 02, then by operator, according to aperture size to be measured, selected the master bar 01 of dimension, then coordinate with thickness clearance gauge and carry out on-the-spot trial cut measurement.Concrete operation step is as follows:

1, according to bore dia to be measured, select the master bar 01 of correspondingly-sized specification.

2,, before right boring hole, adjust spacing between cutter point of a knife and main shaft to desirable size.

3, the front end in machine tooling hole, trial cut roll setting 3mm; Because the diameter of measuring head 22 arc measuring faces is D5, less thinner than the diameter D10 of micrometer inside caliper arc measuring face, therefore trial cut roll setting distance during finishing can narrow down to 3mm left and right, thereby greatly reduce the impact of trial cut roll setting error on product quality.

4, examination is put described master bar 01 to treat, in gaging hole, to refer to Fig. 4 into, if put to enter, illustrates that hole dimension to be measured is less than normal, readjusts cutter point of a knife to suitable size, trial cut roll setting again; If can put into, illustrate that hole dimension to be measured is slightly bigger than normal, used thickness clearance gauge is measured the gap between described master bar 01 measuring head 22 tops and hole wall to be measured, then add the fixed measure L of this master bar 01, can draw the physical size in roll setting trial cut hole, readjust the trial cut roll setting again of cutter point of a knife, until find suitable roll setting size.

, utilize micrometer inside caliper repetition measurement bore dia to be measured, confirm after errorless to carry out the processing of full hole.

Obviously adopt after the utility model, greatly reduce on the one hand the purchase cost of high-acruracy survey instrument, simplified on the other hand the time of measuring adjustment instrument and operation.In actual processing, scene utilizes described master bar to coordinate thickness clearance gauge method of operating easy to learn, has effectively avoided misunderstanding the maloperations such as size, when guaranteeing product quality, has improved efficiency.

Above-described embodiment is not used for limiting scope of the present utility model; the protection domain that the utility model requires is not limited only to above-described embodiment; also should comprise that other are to the apparent conversion of the utility model and replacement scheme; the equivalence that all foundations content of the present utility model is made changes and revises, and all belongs to category of the present utility model.

Claims

1. a master bar of measuring for large aperture, it is characterized in that, described master bar comprises shaft and two top tip parts, this two top tip part is fixedly connected on respectively the two ends of described shaft, described top tip part is comprised of cone and measuring head, and the large end of this cone is fixedly connected with described shaft, and this measuring head is spherical crown shape, be fixedly connected on the small end of described cone, between the top of described two top tip part measuring heads, the precision of size L is ± 0.003mm.

2. the master bar of measuring for large aperture according to claim 1, is characterized in that, described shaft is provided with labeling section, and this labeling section is a plane, shows the sign of size L above.

3. the master bar of measuring for large aperture according to claim 1 and 2, is characterized in that, two described top tip parts are through Quenching Treatment, more than hardness reaches HS=75.

4. the master bar of measuring for large aperture according to claim 1 and 2, is characterized in that the radius of spherical crown R=10mm of described measuring head, diameter D=5mm at the bottom of spherical crown.