CN207344264U - Cylinder zooms cam machining precision detection device - Google Patents

Abstract

The utility model relates to a processing accuracy detection device for a cylindrical zoom cam. The device includes a lathe, a six-degree-of-freedom adjustment tool, an indexing dial, a measuring shaft and a measuring instrument; the six-degree-of-freedom adjusting tool is installed on a three-jaw chuck, and the indexing dial is set on the six-degree-of-freedom adjusting tool; to be tested The cylindrical zoom cam is installed on the six-degree-of-freedom adjustment tool; the six-degree-of-freedom adjustment tool and the cylindrical zoom cam to be measured are all set coaxially with the rotating spindle; the measuring shaft and the measuring instrument are installed on the tool holder and arranged side by side ; The outer diameter of the measuring shaft matches the width of the helical groove on the cylinder zoom cam to be measured. The device can realize straightness measurement, roundness measurement, distance error measurement between helical grooves and measurement of multi-line helical groove average division error of cylindrical zoom cam after one-time clamping and adjustment. The detection accuracy and cost are greatly improved while the detection operation steps are simplified.

Description

A machining accuracy detection device for a cylindrical zoom cam

technical field

The utility model belongs to the detection field of optical instruments, in particular to a processing accuracy detection device for a cylindrical zoom cam.

Background technique

The zoom cam is the key part of the zoom optical system to achieve optical zoom. The working principle of the zoom cam is to use the curve profile of the part itself to drive the driven part connected to it to reciprocate, that is, to convert the rotary motion of the part into Linear motion of moving parts. Therefore, the straightness of the cylinder, the roundness of the cylinder, the machining accuracy of the spiral groove curve and the even division of the multi-line spiral groove on the cylinder directly affect the imaging quality of the optical system after the part is processed.

Traditional detection methods can only rely on a small number of three-coordinate measuring machines equipped with high-precision rotating mechanisms for approximate measurement. Influenced by many factors such as the smoothness of the inflection point of the curve, the detection results are inaccurate and unstable, and there are different degrees of misjudgment. At the same time, the whole process is cumbersome, time-consuming, with high detection uncertainty and high detection cost.

Utility model content

In order to solve the problems in the background technology, the utility model provides a cylindrical zoom cam processing accuracy detection device, which can realize the straightness of the zoom cam cylinder, the roundness of the cylinder, the coordinates of the spiral groove curve and the The detection of the uniform division of the multi-line spiral groove on the cylinder greatly improves the detection accuracy and detection cost, and at the same time greatly simplifies the operation steps during detection.

Concrete technical scheme of the present utility model is:

A cylindrical zoom cam processing accuracy detection device, including a lathe; the head of the lathe is equipped with a rotating spindle, a three-jaw chuck is installed on the rotating spindle, a moving tray is installed in the middle of the lathe, and a tailstock is arranged at the tail of the lathe; A knife holder is installed on the pallet;

It is characterized in that it also includes a six-degree-of-freedom adjustment tool, an indexing dial, a measuring shaft and a measuring instrument;

The six-degree-of-freedom adjustment tool is installed on the three-jaw chuck, and the indexing dial is set on the six-degree-of-freedom adjustment tool; the cylinder zoom cam to be tested is installed on the six-degree-of-freedom adjustment tool; the six-degree-of-freedom adjustment tool, the cylinder to be tested The body zoom cams are coaxially arranged with the rotating main shaft;

The measuring shaft and the measuring table are all installed on the knife rest and arranged side by side; the outer diameter of the measuring shaft matches the width of the helical groove on the zoom cam of the cylinder to be measured.

Specifically, the six-degree-of-freedom adjustment tool is used to adjust the six-degree-of-freedom cylindrical zoom cam to ensure that the geometric centerline of the cylinder is coaxial with the rotational centerline of the rotating spindle of the lathe.

Further, the outer diameter of the measuring shaft fits with the helical groove on the cylinder zoom cam to be measured; the gap is 0.03-0.06 mm;

Specifically, the measuring instrument is a dial indicator or a dial gauge.

The utility model has the advantages of:

1. By adopting the measuring device of the present utility model, the straightness of the zoom cam cylinder, the roundness of the cylinder, the distance error of the spiral groove and the uniform division error of the multi-line spiral groove on the cylinder can be realized after one-time clamping and adjustment. Measurement greatly improves the detection accuracy and detection cost, and at the same time greatly simplifies the operation steps during detection.

2. By adopting the method of the utility model, the error caused by the influence of the pitch angle of the helix when measuring the distance of the helix in the traditional method is avoided, and the measurement accuracy is higher.

3. The utility model has a one-to-one correspondence between the measuring distance and the rotation angle of the cylinder zoom cam to be measured, each angle can measure a distance error, and the precision is higher.

4. The utility model can add a six-degree-of-freedom adjustment tool and a measuring axis to the ordinary machine tool to realize the measurement of the four parameters of the cylinder zoom cam to be tested, without the need for a special lathe or the purchase of a complete set of testing equipment, and the cost is low.

Description of drawings

Fig. 1 is the structural diagram of device of the present utility model;

Fig. 2 is the schematic diagram of the utility model when measuring the distance error of the spiral groove;

Fig. 3 is a schematic diagram of the utility model when measuring the uniform division error of the multi-line spiral groove.

The reference signs are as follows:

1. Lathe 2. Three-jaw chuck 3. Six-degree-of-freedom adjustment tooling 4. Index dial, 5. Cylinder zoom cam to be measured 6. Measuring shaft, 7. Tool holder 8. Dial indicator or dial indicator, 9. Rotating spindle, 10. Moving pallet, 11. Tailstock.

Detailed ways

1. Composition of detection device

The composition of the detection device is shown in Figure 1.

The device comprises a lathe 1; the head of the lathe 1 is equipped with a rotating main shaft 9, and a three-jaw chuck 2 is installed on the rotating main shaft 9; A tool holder 7 is installed on the tray 10; it also includes a six-degree-of-freedom adjustment tool 3, an indexing dial 4, a measuring axis 6 and a measuring instrument;

The six-degree-of-freedom adjustment tool 3 is installed on the three-jaw chuck 2, and the index dial 4 is set on the cylinder zoom cam 5 to be tested; the cylinder zoom cam 5 to be tested is installed on the six-degree-of-freedom adjustment tool 3; the six-freedom The degree adjustment tool 3, the cylindrical zoom cam 5 to be tested are all coaxially arranged with the rotating main shaft 9;

Among them, the six-degree-of-freedom adjustment tool 3 is used to adjust the six-degree-of-freedom cylindrical zoom cam to ensure that the geometric centerline of the cylinder is coaxial with the rotational centerline of the rotating spindle of the lathe.

Measuring shaft 6 and measuring instrument are all installed on the knife rest 7, and arrange side by side; The outer diameter of described measuring shaft 6 matches the width of the spiral groove on the cylinder zoom cam 5 to be measured (specifically, the outer diameter of measuring shaft diameter and the helical groove on the cylindrical zoom cam to be tested; the clearance is 0.03-0.06mm).

Specifically, the measuring instrument is a dial indicator or a dial gauge 8 .

2. Installation and adjustment of the cylindrical zoom cam to be tested

1. Install the six-degree-of-freedom adjustment tooling 3 on the three-jaw chuck 2 of the lathe 1;

2. Fix the indexing dial 4 equipped with the cylindrical zoom cam 5 to be measured on the six-degree-of-freedom adjustment tool 3;

3. Adjust the translation and tilt constraints of the six-degree-of-freedom adjustment tooling 3 during the rotation of the rotating spindle of the lathe 1, so that the cylindrical geometric center of the cylindrical zoom cam 5 to be measured coincides with the rotation center of the rotating spindle of the lathe 1. During the adjustment process, use Fixed dial indicator or dial gauge 8 on the mobile pallet 10 is calibrated and corrected;

4. The criterion that the cylindrical geometric center of the cylindrical zoom cam 5 to be tested coincides with the spindle rotation center of the lathe 1 is that the installation or positioning reference plane of the cylindrical zoom cam 5 to be tested has no jump;

5. If the cylindrical zoom cam 5 to be tested is too long or the rigidity is not enough, use the lathe tailstock 11 to provide auxiliary support.

3. Cylindrical zoom cam straightness detection

A1: Fix the dial indicator or dial gauge on the mobile pallet, adjust the height of the probe of the dial gauge or dial gauge to make it equal to the rotating spindle of the lathe, and ensure that the stretching direction of the probe of the dial gauge or dial gauge is in line with the Contact surface normal coincidence;

A2: Lock the rotating spindle of the lathe to prevent it from rotating;

A3: By adjusting the position of the moving tray from left to right or from right to left, the runout of the cylindrical zoom cam surface can be measured through a dial indicator or a dial indicator, and the straightness can be calculated through the runout.

4. Roundness detection of cylindrical zoom cam

B1: Fix the dial gauge or dial gauge on the moving pallet of the lathe, adjust the height of the dial gauge or dial gauge probe to be equal to the height of the lathe rotating spindle, and ensure the telescopic direction of the dial gauge or dial gauge probe and the contact surface method line overlap;

B2: After selecting the section of the cylindrical zoom cam to be measured, the runout of the section is measured by rotating the main shaft of the lathe for one cycle, and the roundness can be calculated through the runout.

5. Detection of the distance error of the helical groove of the cylindrical zoom cam

See Figure 2:

C1: Fix the measuring axis on the tool holder, adjust the axis line of the measuring axis to be equal to and coplanar with the axis line of the rotating spindle of the lathe, and ensure that the axis line of the measuring axis and the rotating spindle of the lathe are perpendicular to each other;

C2: Adjust the zoom cam of the cylinder to be measured to the measurement position, lock the rotating spindle of the lathe to prevent it from rotating; move the tool holder so that the measurement axis is in contact with any point A of the first helical groove in the zoom cam of the cylinder to be measured , and at the same time clear the display value of the moving pallet position to 0;

C3: Return the tool holder to the original position to separate the measurement axis from point A; then move the pallet to advance the measurement axis by a distance d; when moving the distance d, it must be ensured that the measurement axis can be aligned with the second spiral groove driven by the tool holder Any point B touches, at this time, the display value of the moving pallet position is d;

C4: Read out the display value d of the moving tray and add the gap between the outer diameter of the measuring shaft and the width of the cam spiral groove to obtain the actual measured dimension D between point A and point B;

D=d+gap amount;

C5: According to the difference between the measured dimension D and the theoretical dimension D1, determine the distance error between the multi-line spiral grooves of the cylindrical zoom cam at the initial angle;

C6: Make the rotating spindle of the lathe drive the cylindrical zoom cam to rotate, repeat steps C2 to C4, measure all fitting points in the spiral groove, and obtain a sequence of distance error values of all fitting points.

6. Detection of the average indexing error of the multi-line spiral groove of the cylindrical zoom cam

See Figure 3:

D1: Fix the measuring axis on the tool holder, adjust the axis line of the measuring axis to be equal to and coplanar with the axis line of the rotating spindle of the lathe, and at the same time ensure that the axis line of the measuring axis and the rotating spindle of the lathe are perpendicular to each other;

D2: Adjust the zoom cam of the cylinder to be measured to the measurement position, lock the rotating spindle of the lathe to prevent it from rotating; move the tool holder so that the measurement axis is in contact with any point A of a spiral groove in the zoom cam of the cylinder to be measured, and at the same time Clear the angle display value of the index dial to 0°;

D3: Return the tool holder to the original position to separate the measuring axis from point A; then turn the indexing dial to rotate the measuring axis α°; when rotating α°, it is necessary to ensure that the measuring axis can be driven by the rotating spindle of the lathe with another Any point B of the spiral groove is in contact, at this time, the angle display value of the index dial is α°;

D4: Read the angle display value of the indexing dial α°, and make a difference between it and the theoretical average index between the multi-line spiral groove, and then the average index error of the multi-line spiral groove can be obtained.

It should be noted that when measuring the average division degree, when the spiral groove has two ends, the theoretical average division degree is 180°, and when the measured ︱α-β︱°=179.99°, the average The indexing error is 0.01°;

When the spiral groove has 3 heads, the theoretical average division is 120°, and when the measured ︱α-β︱°=120.02°, the average division error on the cross-section H is 0.02°.

Claims (4)

1. A cylindrical zoom cam processing accuracy detection device, comprising a lathe; the head of the lathe is equipped with a rotating main shaft, a three-jaw chuck is installed on the rotating main shaft, a moving pallet is installed in the middle of the lathe, and a tailstock is arranged at the tail of the lathe ;The knife rest is installed on the mobile pallet; It is characterized in that it also includes a six-degree-of-freedom adjustment tool, an indexing dial, a measuring shaft and a measuring instrument; The six-degree-of-freedom adjustment tool is installed on the three-jaw chuck, and the indexing dial is set on the six-degree-of-freedom adjustment tool; the cylinder zoom cam to be tested is installed on the six-degree-of-freedom adjustment tool; the six-degree-of-freedom adjustment tool, the cylinder to be tested The body zoom cams are coaxially arranged with the rotating main shaft; The measuring shaft and the measuring table are all installed on the knife rest and arranged side by side; the outer diameter of the measuring shaft matches the width of the helical groove on the zoom cam of the cylinder to be measured. 2. The machining accuracy detection device of a cylindrical zoom cam according to claim 1, wherein the six-degree-of-freedom adjustment tooling includes a device for adjusting the six degrees of freedom of the cylindrical zoom cam to be measured to ensure the geometric centerline of the cylinder Coaxial with the centerline of rotation of the turning spindle of the lathe. 3. The machining accuracy detection device of a cylindrical zoom cam according to claim 2, characterized in that: the outer diameter of the measuring shaft fits with the helical groove on the cylindrical zoom cam to be tested; the clearance is 0.03-0.06mm. 4. The machining accuracy detection device for cylindrical zoom cam according to claim 3, characterized in that: the measuring instrument is a dial indicator or a dial indicator.