CN201221934Y - Tap anterior angle checking tool - Google Patents

Abstract

The utility model relates to a screw-tap front-angle checking fixture, which is used for resolving the problem of the measurement precision, and adopts the technical proposal that the checking fixture comprises a holding mechanism of a measured screw tap and a measuring combination system, wherein, the holding mechanism comprises a sliding guide rail, two center rests, a left center, a right center and a supporting seat; the sliding guide rail is fixed on the center rest, and two center rests are respectively provided with the left center and the right center; the supporting seat is sleeved on the sliding guide rail, and the upper end is provided with a guiding rod; the measuring combination system comprises a meter seat, a measuring rod and a dial indicator, and the measuring combination system is installed on the guiding rod and can move from up to down on the guiding rod. The checking fixture has the advantages of simple structure, convenient application, rapid measurement, precise reading, and the like, and is widely used for the front-angle measurement of different screw taps.

Description

Screw tap anterior angle cubing

Technical field

The utility model relates to a kind of survey instrument, especially screw tool--the testing tool of-screw tap anterior angle.

Background technology

The screw tap anterior angle is the important quality parameter of screw tap product, directly influences the cutting ability of screw tap, and according to the difference of machined material, anterior angle has very big difference.Threading tool manufacturer uses many always

Bevel protractor is measured (tap for metric thread can be used preceding angle measuring instrument, but before making screw thread, can't use) in the anterior angle process, need the tester to be adjacent to the preceding edged surface of screw tap with the very short sword actinal surface of bevel protractor, meet light and judge whether be adjacent to, again according to screw tap groove number, the reading on the reading angular chi.The problem that this measuring method exists is: it is bigger that measuring accuracy is influenced by human factor, measures inaccurately, and measuring speed is slow, and for batch process, its detection efficiency is very low.

Summary of the invention

The utility model is used to overcome the prior art existing problems, provides a kind of and can directly read measurement result, accurate, the easy to operate screw tap anterior angle cubing of data from dial gauge.

Problem described in the utility model is realized by following technical scheme:

A kind of screw tap anterior angle cubing, it is made up of the clamping device and the measurement combined system of tested screw tap, described clamping device is made up of top, the right top and bearing in rail plate, two centrre rests, a left side, and stationary center frame on the described rail plate is installed left top and right top respectively on two centrre rests; Bearing is set on the rail plate, and guide rod is equipped with in the upper end; Described measurement combined system is made up of gauge stand, measuring staff and dial gauge, and the measurement combined system is installed on the guide rod and can moves up and down.

Above-mentioned screw tap anterior angle cubing, described measuring staff front end is the right angle workplace, described right angle workplace is made up of first rectangular block and second rectangular block that vertically are set on the measuring staff.

Above-mentioned screw tap anterior angle cubing is set up the zeroing auxiliary plane on the described bearing.

The utility model has designed the special-purpose clamping device of tested screw tap, can be rapidly with the screw tap fix in position, and accurate positioning.Adopt and measure combined system, can measure the BC size in the right-angle triangle of forming by the contact axis and the right angle workplace extended line of dial gauge (the intersection point A of the contact center line BC of dial gauge and first rectangular block 10 and second rectangular block 11 forms right-angle triangle ABC) very easily, because AB is a fixed value, can try to achieve the anterior angle angle of tested screw tap easily by formula Y=arctg (BC/AB).

Description of drawings

Fig. 1 is the utility model structural front view;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the measuring principle synoptic diagram.

Each label is among the figure: 1. centrre rest, 2. a left side top, 3. right top, 4. bearing, 5. measure combined system, 6. guide rod, 7. gauge stand, 8. measuring staff, 9. dial gauge, 10. first rectangular block, 11. second rectangular blocks, 12. zeroing auxiliary planes, 13, rail plate.

Embodiment

Referring to Fig. 1, Fig. 2, screw tap anterior angle cubing structure comprises top 2, right top 3, the bearing 4 of the centrre rest 1 that has rail plate 13, a left side, measures combined system 5 and guide rod 6, measures combined system 5 and comprises gauge stand 7, measuring staff 8, dial gauge 9, first rectangular block 10 and second rectangular block 11.Bearing 4 can slide on rail plate 13, can change the measuring position; Measuring combined system 5 can slide on the guide rod above the bearing 46, to adapt to the detection of different-diameter screw tap; Measuring staff 8 front ends are the right angle face, and top 2, right top 3 the center line in a left side is on first rectangular block, 10 workplaces, and the dial gauge contact is a fixed-length value AB apart from last plane.

With reference to figure 3, in right-angle triangle ABC, AB is a fixed value, and BC can be read by the reading value in the dial gauge, draws anterior angle angle Y=arctg (BC/AB) according to tgY=BC/AB, calculates the angle of anterior angle according to this formula.

Using method:

1, dial gauge zeroing: be adjacent to the zeroing auxiliary surface 12 on the bearing and the workplace of measuring staff front end first rectangular block 10 with a little plain block with plane, dial gauge is transferred to zero-bit.

2, pack into two top of cubings of screw tap, forward edged surface before tested to top, mention the measurement combined system, measuring staff is pressed in screw tap anterior angle top, rotating screw tap then makes preceding angular vertex contact with measuring staff right angle vertex of surface, read the BC numerical value that dial gauge changes, AB is a fixed value, draws anterior angle angle Y=arctg (BC/AB) according to tgY=BC/AB.

3, the rotation screw tap is measured another groove anterior angle angle.

The utlity model has characteristics such as simple in structure, easy to use, that measurement is fast, accurate, be widely used in the preceding angular measurement of various screw taps.

Claims (3)

1, a kind of screw tap anterior angle cubing, it is characterized in that, it is made up of the clamping device and the measurement combined system [5] of tested screw tap, described clamping device is made up of rail plate [13], two centrre rests [1], a left side top [2], right top [3] and bearing [4], stationary center frame on the described rail plate is installed a left side top [2] and right top [3] respectively on two centrre rests; Bearing [4] is set on the rail plate, and guide rod [6] is equipped with in the upper end; Described measurement combined system [5] is made up of gauge stand [7], measuring staff [8] and dial gauge [9], and measurement combined system [5] is installed in guide rod [6] and goes up and can move up and down.

2, screw tap anterior angle cubing according to claim 1 is characterized in that, described measuring staff [8] front end is the right angle workplace, and described right angle workplace is made up of first rectangular block [10] and second rectangular block [11] that vertically are set on the measuring staff.

3, screw tap anterior angle cubing according to claim 1 and 2 is characterized in that, sets up zeroing auxiliary plane [12] on the described bearing [4].

Images