CN220660572U - Piston processing location frock - Google Patents

Abstract

The utility model provides a piston machining positioning tool, which relates to the technical field of piston machining and adopts the following scheme: including the location mould, be provided with top open-ended positioning groove on the location mould, positioning groove is oval, and positioning groove is along the length of piston pin hole axis direction for D1 (oval major axis), and positioning groove perpendicular to piston pin hole axis direction's length is D2 (oval minor axis), and D1 is greater than D2, and one side of location mould is provided with the locating rack, and the locating rack is along piston pin hole axis direction and location mould interval arrangement, and one side that is close to the location mould on the locating rack is provided with the setpoint. The utility model has the following effects: the phenomena of overlarge width deviation and different outer chamfer angles at two sides of the clamping groove can be well avoided, and the products which are out of tolerance and are qualified can be intuitively seen through adjusting the clearance between the clamping fixture and the piston without using a caliper for detection.

Description

Piston processing location frock

Technical Field

The utility model relates to the technical field of piston machining, in particular to a piston machining positioning tool.

Background

The piston of automobile engine is one of main fittings in engine, it and piston ring, piston pin and other parts form a piston group, and together with cylinder cover and other parts form a combustion chamber, and can bear the action force of fuel gas and transfer the power to crankshaft by means of piston pin and connecting rod so as to implement the working process of internal combustion engine. Because the piston is in a high-speed, high-pressure and high-temperature severe working environment, and the stable and durable operation of the engine is considered, the piston is required to have enough strength and rigidity, good heat conductivity, high heat resistance, small expansion coefficient (small change of size and shape), small relative density (light weight), wear resistance, corrosion resistance and low cost. Because of the high and high requirements, some requirements contradict each other, and it is difficult to find a piston material which can fully meet each requirement. The piston middle forging steel and the welding piston of the modern engine are widely applied, have higher strength and rigidity, good thermal conductivity, wear resistance and corrosion resistance, and have high requirements on the piston, so the processing technology requirements on the forging steel and the welding piston are correspondingly very strict.

At present, the problems easily occurring in the processing process of forging steel and welding pistons are as follows: after rough machining, the spigot or the inner cavity is deviated, so that the axis of the fine hole is not vertical to the inner cavity, the width deviation of two sides of the clamping groove is overlarge, the outer chamfer is different in size, and partial defective products can be produced in each batch; and the piston cavity deflection also needs to be detected, and each caliper is low in detection efficiency.

Disclosure of Invention

The utility model aims to solve the problems that in the existing forging steel and welding piston machining process, the width deviation of two sides of a clamping groove is overlarge, the outer chamfer angle is different in size, and the detection efficiency of a caliper for the piston inner cavity is low, and provides a piston machining positioning tool which can well avoid the phenomena that the width deviation of two sides of the clamping groove is overlarge and the outer chamfer angle is different in size, and can intuitively see which products are out of tolerance and which are qualified through adjusting the clearance between a clamping fixture and a piston, and does not need to be detected by using the caliper.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a piston processing location frock, including the location mould, be provided with top open-ended positioning groove on the location mould, positioning groove is oval, positioning groove is D1 (oval major axis) along the length of piston pin hole axis direction, positioning groove perpendicular to piston pin hole axis direction's length is D2 (oval minor axis), D1 is greater than D2, one side of location mould is provided with the locating rack, the locating rack is in along piston pin hole axis direction with location mould interval arrangement, one side that is close to the location mould on the locating rack is provided with the setpoint. The clamping fixture is changed into an ellipse, and the clamping fixture can be eccentrically turned out by a machining center or a lathe cushion, so that the short axis direction of the piston (namely the D1 direction of the positioning groove) can have a certain moving distance, and the long axis direction of the piston (namely the D2 direction of the positioning groove) has no gap, thereby ensuring the stability of the offset of the piston; the positioning frame is used for fixing the plane of the non-processing surface of the piston, the processed pin hole is vertical to the inner cavity, and the positioning positioner has a gap to ensure that the piston can not touch the positioning point or touch the positioning point but can not be placed in the positioner when the inner cavity deviates from the distance of D1 minus D2, so that the problem can be timely fed back, the occurrence of defective products is reduced to the greatest extent, and the situation that the caliper is not used for measurement can be intuitively seen; because the outer window surface and the inner cavity of the forging piston are formed at one time, after the outer window surface is fixed, the phenomenon that the width deviation of two sides of the clamping groove is too large and the outer chamfer is different can be well controlled by processing the outer window surface by a program with the same origin.

Further, D1 is 0.5mm to 2mm larger than D2. Further, D1 is 1mm greater than D2. By placing the piston in the positioning groove of the positioning mould, the short axis direction of the piston can have a moving distance of 1mm, and the long axis direction of the piston has no gap, so that the stability of the piston deflection is ensured. The positioning mould and the piston have a gap to ensure that the piston can not touch the positioning point or touch the positioning point but can not be placed in the positioning mould when the positioning groove is deviated by more than 1mm.

Further, the number of the positioning points is two, and the positioning frame and the positioning points are both positioned on one side of the non-processing surface plane of the piston to be processed. The positioning points on the positioning frame are utilized to fix the plane of the non-processing surface of the piston, the processed pin holes are ensured to be perpendicular to the inner cavity, and the two positioning points can avoid deflection of the piston, so that the positioning of the piston is more accurate.

Further, the locating points are locating pins, and the two locating points are respectively positioned at two sides of a piston pin hole to be processed (namely, the pin hole of the piston is positioned between the two locating points after the piston is installed). The two sides of the piston pin hole to be processed can be positioned, and the positioning accuracy is ensured.

Further, the locating rack includes the base, is provided with two stands on the base, every stand interval arrangement, and the setpoint sets up on the stand. The two positioning columns provide mounting positions for positioning points, are arranged at intervals, and leave a pin hole of a piston to be machined at intervals so as to facilitate machining.

Further, the device also comprises a positioning platform, and the positioning frame and the positioning mould are arranged on the positioning platform. The bottom surface is guaranteed to be placed horizontally, and the positioning reference is guaranteed to enable positioning to be accurate.

From the above technical scheme, the utility model has the following advantages:

the utility model provides a piston processing location frock, location mould set up oval-shaped positioning groove, can utilize machining center or lathe pad eccentric car to come out, thereby let piston minor axis direction can have 1 mm's travel distance, thereby piston major axis direction does not have the clearance and guarantees that the piston skew is stable. The positioning points on the positioning frame are utilized to fix the plane of the non-processing surface of the piston, the processed pin holes are ensured to be vertical to the inner cavity, and the situation that the piston is out of touch with the positioning points or is on touch with the positioning points but is not placed in the positioning mould is ensured to be more than 1mm because the positioning mould has a gap, so that the problem can be fed back timely, and the occurrence of defective products is reduced to the greatest extent; the outer window surface and the inner cavity of the forging piston are formed at one time, and after the outer window surface is fixed, the phenomenon that the width deviation of two sides of the clamping groove is too large and the outer chamfer is different can be well controlled by processing the outer window surface by a program with the same origin.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a piston according to an embodiment of the present utility model.

Fig. 2 is a schematic structural view of a piston to be machined.

FIG. 3 is a top view of a positioning mold according to an embodiment of the present utility model.

In the figure, 1, a positioning platform, 2, a positioning mould, 3, a positioning groove, 4, a positioning frame, 5, a positioning point, 6, a piston to be processed, 7 and a pin hole axis.

Detailed Description

In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the utility model are intended to be within the scope of the patent protection.

As shown in fig. 1 to 3, this embodiment provides a piston processing location frock, including location platform 1, location mould 2 has been placed on the location platform 1, be provided with the open-ended positioning groove 3 in top on the location mould 2, positioning groove 3 is oval, positioning groove 3 is along the length of piston pin hole axis direction for D1 (oval major axis), positioning groove 3 perpendicular to piston pin hole axis direction's length is D2 (oval minor axis), D1 is greater than D2 by 1mm, one side of location mould 2 is provided with locating rack 4, locating rack 4 is along piston pin hole axis direction and location mould 2 interval arrangement, one side that is close to location mould 2 on the locating rack 4 is provided with setpoint 5. Specifically, the number of the positioning points 5 is two, and the positioning frame 4 and the positioning points 5 are both positioned on one side of the non-processing surface plane of the piston 6 to be processed. The locating rack 4 includes the base, is provided with two stands on the base, every stand interval arrangement, and setpoint 5 sets up on the stand, and two reference columns provide mounted position for setpoint 5, and interval arrangement wherein, setpoint 5 is the locating pin, and two setpoint 5 are located the both sides of waiting to process piston 6 pinhole respectively.

The setting principle is as follows: the positioning mould 2 is provided with an elliptical positioning groove 3, and can be eccentrically turned out by a machining center or a lathe cushion, so that the short axis direction of the piston can have a moving distance of 1mm, and the long axis direction of the piston has no gap, thereby ensuring the stability of the piston deflection. The positioning point 5 on the positioning frame 4 is used for fixing the plane of the non-processing surface of the piston, the processed pin hole is ensured to be vertical to the inner cavity, and the situation that the piston is out of the way of 1mm and can not touch the positioning point 5 or touch the positioning point 5 but cannot be placed in the positioning mold 2 is ensured because the positioning mold 2 has a gap, so that the problem can be fed back timely, and the occurrence of defective products is reduced to the greatest extent; the outer window surface and the inner cavity of the forging piston are formed at one time, and after the outer window surface is fixed, the phenomenon that the width deviation of two sides of the clamping groove is too large and the outer chamfer is different can be well controlled by processing the outer window surface by a program with the same origin.

The terms "upper," "lower," "outboard," "inboard," and the like in the description and in the claims of the utility model and in the above figures, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The utility model provides a piston processing location frock, includes the location mould, is provided with top open-ended positioning groove on the location mould, its characterized in that, positioning groove is oval, and positioning groove is D1 along the length of piston pin hole axis direction, and positioning groove perpendicular to piston pin hole axis direction's length is D2, and D1 is greater than D2, and one side of location mould is provided with the locating rack, and the locating rack is in along piston pin hole axis direction with location mould interval arrangement, is provided with the setpoint on the locating rack near one side of location mould.

2. The piston tooling positioning tool of claim 1, wherein D1 is 0.5mm to 2mm greater than D2.

3. The piston tooling positioning tool of claim 2, wherein D1 is 1mm greater than D2.

4. A piston machining positioning tool according to any one of claims 1-3, wherein two positioning points are provided, and the positioning frame and the positioning points are positioned on one side of a non-machining plane of the piston to be machined.

5. The piston machining positioning tool according to claim 4, wherein the positioning points are positioning pins, and the two positioning points are respectively positioned on two sides of the piston pin hole to be machined.

6. The piston machining positioning tool of claim 5, wherein the positioning frame comprises a base, two stand columns are arranged on the base, each stand column is arranged at intervals, and the positioning points are arranged on the stand columns.

7. A piston machining positioning tool according to any one of claims 1-3, further comprising a positioning platform, the positioning frame and the positioning mould being placed on the positioning platform.