CN204575481U - A kind of forced plasticity deforming frictional wear test device - Google Patents

Abstract

The utility model relates to a friction and wear test device for strong plastic deformation, comprising a frame, a workpiece round bar fixture, a ball pin ejection mechanism, and a translation mechanism; the workpiece round bar fixture clamps one end of the workpiece round bar and drives the workpiece round bar to wind The cylindrical axis rotates; the ball stud ejection mechanism installed on the frame clamps one end of the ball stud and the other end of the ball stud is pressed against the outer cylindrical surface of the workpiece rod; The mechanism translates relative to the frame, and when the translation mechanism operates, the ball stud translates along the axial direction of the workpiece round rod. The utility model has the advantages of simple structure and convenient operation. The existing CNC machining center can be used for transformation to comprehensively evaluate the cutting friction and wear characteristics between workpieces/tools, and belongs to the technical field of friction and wear detection.

Description

A strong plastic deformation friction and wear test device

technical field

The utility model relates to the technical field of friction and wear detection, in particular to a strong plastic deformation friction and wear test device.

Background technique

When using a conventional disc-pin friction tester to evaluate the cutting friction and wear characteristics between the workpiece/tool, the friction and wear between the pin and the friction disc along the repeated fixed track is difficult to truly simulate the high contact stress conditions in cutting conditions The process of continuous cutting extrusion friction between the cutting tool and the fresh surface of the workpiece material. Therefore, it is very necessary to provide a new method and device that can fully reflect the cutting friction and wear characteristics between the workpiece/tool. Figure 1 is a schematic diagram of the friction and wear test method for strong plastic deformation. The workpiece rod rotates on its own, the ball stud pin presses against the outer cylindrical surface of the workpiece rod laterally, and at the same time the ball stud and the workpiece rod move axially relative to each other. Because the ball stud pin and the workpiece round bar are in point contact, they have a high contact pressure; because the workpiece round bar rotates and has relative axial translation with the ball stud pin at the same time, the friction track has no repetition. The utility model is a test device designed based on this principle.

Utility model content

Aiming at the technical problems existing in the prior art, the purpose of this utility model is to provide a strong plastic deformation friction and wear test device that can comprehensively evaluate the cutting friction and wear performance of workpieces/tools.

In order to achieve the above object, the utility model adopts the following technical solutions:

A friction and wear test device for strong plastic deformation, including a frame, a workpiece round bar fixture, a ball pin ejection mechanism, and a translation mechanism; the workpiece round bar fixture clamps one end of a cylindrical workpiece round bar and drives the workpiece round bar around the cylinder The axis of rotation of the shape; the ball stud ejection mechanism installed on the frame clamps one end of the ball stud and the other end of the ball stud is pressed against the outer cylindrical surface of the workpiece round rod; the workpiece round rod clamp passes through the translation mechanism Relative to the translation of the frame, when the translation mechanism operates, the ball stud translates along the axial direction of the workpiece round rod. After adopting the structure designed based on the principle of strong plastic deformation friction and wear test, the cutting friction and wear performance of the workpiece/tool can be comprehensively evaluated, which can not only ensure a large contact stress, but also ensure that the contact track is not repeated.

The axis of the workpiece round bar is set along the up-down direction, the workpiece round bar clamp clamps the upper end of the workpiece round bar, and the translation direction of the translation mechanism is the up-down direction.

The CNC machining center includes a worktable, a toolholder, and a toolholder translation mechanism. The rotatable toolholder moves up and down along the worktable through the toolholder translation mechanism; the worktable is used as the frame, the toolholder is used as the workpiece The clip translation mechanism is used as translation mechanism. After adopting this structure, the existing CNC machining center is selected as the friction and wear test device of the utility model, and the ball pin ejection mechanism is installed on the work table, and the cutting friction of the workpiece/tool can be carried out only by simple modification Wear performance test.

The ball stud ejection mechanism includes a collet, a support seat, a threaded rod, a spring, and a nut; the front end of the collet clamps the ball stud, the front end of the threaded rod is fixed at the rear end of the collet, and the middle section of the threaded rod passes through the support seat , the rear end of the threaded rod is screwed to the nut, the spring compressed between the support seat and the collet is sleeved outside the threaded rod, and the rear end of the support seat tightens the front end of the nut. After adopting this structure, adjusting the position of the nut can control the distance between the support seat and the chuck, and then control the spring force, and finally control the tightening force of the ball stud on the workpiece round rod. The structure is simple and the operation is convenient.

A strong plastic deformation friction and wear test device also includes a dynamometer, and a support base, a dynamometer, and a frame are sequentially arranged from top to bottom. After adopting this structure, the pressing force of the ball stud pin on the workpiece round bar is detected in real time by the dynamometer.

Both the rear end surface of the collet and the front end surface of the support seat are provided with annular grooves, and the two ends of the spring are respectively located in the two annular grooves. After adopting this structure, the displacement of the spring is avoided.

The threads of the threaded rod are distributed on the rear section of the threaded rod. After adopting this structure, there is no need to provide threads on the entire section of the threaded rod, and the structure is simple.

There is a thermocouple inside the ball stud. With this structure, the temperature of the ball stud can be detected in real time.

The threaded rod is provided with a through hole running through the axis, and the electric wire connected with the thermocouple passes through the through hole and protrudes from the rear end of the threaded rod.

There is a point contact between the ball stud and the workpiece rod. After adopting this structure, it can ensure a relatively large contact stress.

The principle of the utility model is: according to the principle of strong plastic deformation, the spatial structure of the friction pair is designed, and the contact relationship of the friction pair in the conventional pin-type friction and wear test method is changed from the original surface contact to point contact ( As shown in Figure 1), in order to greatly increase the contact stress between the friction pairs, so as to truly reflect the high contact stress generated by the workpiece and the tool during the cutting process; and through the design of the relative motion between the friction pairs, the friction pairs While there is a relative rotational movement, there is also a relatively continuous translational movement, so that the contact and friction between the friction pairs are carried out along a continuous and non-repetitive trajectory, and the continuous movement between the fresh surface of the workpiece round rod and the ball stud is realized. Squeeze friction, so as to truly reflect the friction and wear process that occurs when the tool continuously cuts the workpiece material during the cutting process.

In general, the utility model has the following advantages: it can make up for the shortcomings of the existing conventional disc-pin friction and wear test technology, and simulate the high contact stress in the cutting process through the point contact between the ball stud and the workpiece round rod ; Through continuous and non-repetitive friction track design, to simulate the continuous extrusion friction between the fresh surface of the workpiece material and the tool surface under cutting conditions. Therefore, the comprehensive evaluation of the cutting friction and wear performance of the workpiece/tool can be successfully realized by using the test device of the utility model. The utility model has the advantages of simple structure and convenient operation, and the existing CNC machining center can be used for transformation, and the utility model has strong implementability.

Description of drawings

Figure 1 is a schematic diagram of the strong plastic deformation friction and wear test method.

Fig. 2 is a schematic structural view of the utility model.

Among them, 1 is the ball pin, 2 is the collet, 3 is the workpiece round bar, 4 is the frame, 5 is the support seat, 6 is the force measuring instrument, 7 is the spring, 8 is the wire and thermocouple, n is the workpiece circle The rotation speed of the rod, f is the translational speed of the workpiece round rod, and F _n is the clamping force of the ball stud ejector mechanism.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

A strong plastic deformation friction and wear test device includes a machine frame, a workpiece round rod clamp, a ball pin ejection mechanism, and a translation mechanism. The test device is a set of friction and wear test device designed with CNC machining center as the experimental platform. The workpiece round rod of the present utility model selects graphite rod for use.

The CNC machining center is an existing equipment, and it includes a working table, a main shaft, a tool holder, and a tool holder translation mechanism. The tool holder is installed on the main shaft and is driven by the main shaft to rotate. Through the translation mechanism of the tool holder, the main shaft can be translated up and down along the vertical direction on the work table or the corresponding main shaft on the work table is fed up and down along the vertical direction. The working surface of the CNC machining center is used as the frame of the friction and wear test device; the tool holder of the CNC machining center is used as the workpiece round bar fixture of the friction and wear test device, and the translation mechanism of the tool holder of the CNC machining center is used as the translation of the friction and wear test device mechanism. The workpiece round bar is installed on the main shaft through the standard tool holder, the main shaft rotates to drive the workpiece round bar to rotate, and the main shaft or the work table is fed up and down in the vertical direction, so that the fresh surface of the workpiece round bar can be continuously along the Repeated motion profiles create contact and friction with the ball stud.

The ball stud ejection mechanism includes a collet, a support seat, a threaded rod, a spring, and a nut. The ball stud is mounted on the front end of the collet. The supporting seat is provided with a through hole for the threaded rod to pass through. The rear section of the threaded rod is provided with a thread matched with the nut. The front end of the threaded rod is fixed on the rear end of the collet, the middle part of the threaded rod passes through the support seat, and the rear section of the threaded rod is screwed with a nut. The spring is compressed between the support seat and the collet and fits over the threaded rod. Annular grooves are provided on the collet, the rear end surface and the front end surface of the support seat, and the two ends of the spring are respectively located in the two annular grooves. The front end of the nut pushes against the rear end of the support seat. By adjusting the screw-in depth of the nut, the distance from the support seat to the collet can be changed, thereby changing the elastic force of the spring, and the tightening force of the ball stud can be controlled. An axial through hole is arranged in the threaded rod, which runs through from the front end to the rear end.

The support base is installed on the worktable through the force measuring instrument. The thermocouple is inserted into the inner hole of the ball stud pin to contact the wall of the hole, the wire connected with the thermocouple passes through the through hole of the threaded rod, and the wire protrudes from the rear end of the threaded rod.

During operation, the upper end of the cylindrical workpiece rod is clamped by the tool holder, and the tool holder and the workpiece rod are driven by the spindle to rotate, and the tool holder and the workpiece rod are moved up and down by the tool holder translation mechanism as a whole. The ball pin bears against the cylindrical side wall of the workpiece round rod from the side, and is in point contact with the outer cylindrical surface of the workpiece round rod, which effectively improves the surface contact stress of the friction pair in the conventional disc-pin friction and wear test. Difficult to break, difficult to expose the fresh surface of graphite and other disadvantages. The support seat is installed on the working table of the CNC machining center through a dynamometer. By adjusting the distance between the workpiece round bar and the support seat, the compression state of the spring can be changed, thereby changing the normal load between the friction pairs, and using the tester The force meter monitors and feeds back the load in real time, so that the ball head surface of the ball stud pin presses the outer cylindrical surface of the workpiece round rod with the specified normal load, so as to realize the high controllability of the load, and at the same time, the temperature can be measured by the thermocouple , so the test device is simple in structure and easy to use.

The above-mentioned embodiment is a preferred implementation mode of the utility model, but the implementation mode of the utility model is not limited by the above-mentioned example, and any other changes, modifications, substitutions, Combination and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (10)

1. a forced plasticity deforming frictional wear test device, is characterized in that: comprise frame, workpiece pole fixture, ball stud ejecting mechanism, translation mechanism; One end of workpiece pole holder workpiece pole and drive workpiece pole around columniform axis rotation; One end of rack-mounted ball stud ejecting mechanism clamping ball stud the external cylindrical surface other end of ball stud held out against at workpiece pole; Workpiece pole fixture is by translation mechanism relative to frame translation, and when translation mechanism runs, ball stud is along the axial direction translation of workpiece pole.

2. according to a kind of forced plasticity deforming frictional wear test device according to claim 1, it is characterized in that: the axis of described workpiece pole is arranged along above-below direction, the upper end of workpiece pole clamp workpiece pole, the translation direction of translation mechanism is above-below direction.

3. according to a kind of forced plasticity deforming frictional wear test device according to claim 2, it is characterized in that: CNC machining center comprises work top, cutter holder, cutter holder translation mechanism, rotating cutter holder passes through cutter holder translation mechanism along work top upper and lower translation; Selection work table top does frame, selects cutter holder to do workpiece pole fixture, selects cutter holder translation mechanism to do translation mechanism.

4. according to a kind of forced plasticity deforming frictional wear test device according to claim 1, it is characterized in that: described ball stud ejecting mechanism comprises chuck, supporting seat, threaded rod, spring, nut; The front end clamping ball stud of chuck, the front end of threaded rod is fixed on the rear end of chuck, and the stage casing of threaded rod is through supporting seat, and the rear end of threaded rod spins nut, be compressed in spring housing between supporting seat and chuck outside threaded rod, the rear end of supporting seat holds out against the front end of nut.

5., according to a kind of forced plasticity deforming frictional wear test device according to claim 4, it is characterized in that: it also comprises dynamometer, supporting seat, dynamometer, frame set gradually from top to bottom.

6. according to a kind of forced plasticity deforming frictional wear test device according to claim 4, it is characterized in that: the rear end face of described chuck and the front end face of supporting seat are equipped with ring groove, the both ends of spring lay respectively in two ring grooves.

7. according to a kind of forced plasticity deforming frictional wear test device according to claim 4, it is characterized in that: the screw thread of described threaded rod is distributed in the back segment of threaded rod.

8., according to a kind of forced plasticity deforming frictional wear test device according to claim 4, it is characterized in that: in described ball stud, be provided with thermopair.

9. according to a kind of forced plasticity deforming frictional wear test device according to claim 8, it is characterized in that: described threaded rod is provided with the through hole running through axis, the electric wire connected with thermopair stretches out from the rear end of threaded rod through this through hole.

10. according to a kind of forced plasticity deforming frictional wear test device according to claim 1, it is characterized in that: be point cantact between described ball stud and workpiece pole.