CN100369708C

CN100369708C - Positioning and clamping method for processing piston and processing technique

Info

Publication number: CN100369708C
Application number: CNB021383162A
Authority: CN
Inventors: 薛玉田
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-19
Filing date: 2002-09-19
Publication date: 2008-02-20
Anticipated expiration: 2022-09-19
Also published as: CN1415455A

Abstract

The present invention belongs to an engine piston, especially belongs to a clamping method and processing technique for processing a piston. The present invention relates to a positioning and clamping method for processing a piston, which is characterized in that the present invention comprises the following processes: 1) a processing machine tool is provided; 2) a processing cutter and a fixture are provided; 3) the top of an inner cavity of a piston is adopted as a clamping point, and the external end face of top of the piston and a positioning lug boss are adopted as positioning surfaces. The present invention has the advantages that the clamping force for processing the piston is only acted on an entity at the head part of the piston, the rest part of the piston is free from the clamping force, and deformation caused by the clamping force is eliminated; the positioning surfaces are arranged at the external side of the top of the piston, processing chips of the positioning surfaces are easy to clean, positioning error caused by not cleaned positioning surfaces is eliminated, each form and position tolerance is more stable, clamping times are reduced, labor amount is reduced, and the quality of products and production rate are improved.

Description

The method for positioning and clamping and the processing technology of piston processing

Technical field

The invention belongs to the piston of engine, especially belong to the clamping means and the processing technology of piston processing.

Background technology

Piston has three important machined surfaces, piston external diameter, pin-and-hole internal diameter, the width of circular groove, the degree of depth, as shown in Figure 1, the clamping method of existing piston processing is to add location, key seat hole with piston inner diameter seam location and internal diameter seam plane, clamping point is generally at pin-and-hole (drawing) or head (pressure), piston integral body is stressed, after the process finishing, unclamp clamping, piston resilience, distortion, causing piston in use to leak gas and being inclined to increases, engine power is descended, oil consumption is risen, and discharging increases, and serious meeting causes the scuffing of cylinder bore accident.Locate with the internal diameter seam, the processing smear metal of locating surface is difficult for cleaning out, and returns the form and position tolerance instability cause piston external diameter, circular groove, pin-and-hole (perpendicularity, the depth of parallelism overproof), directly influences the operate as normal of piston in cylinder, strengthen discharging, even scuffing of cylinder bore, engine knock.

Summary of the invention

The present invention has overcome above-mentioned shortcoming, and the processing technology of a kind of machining accuracy height, piston that form and position tolerance is little is provided.

The technical solution adopted in the present invention is a kind of method for positioning and clamping of piston processing, and its main points are that it may further comprise the steps: 1) machining tool is provided; 2) provide process tool, anchor clamps; 3) top with piston cavity is a clamping point, is locating surface with the outer face and the positioning boss of top land.

The clamping force of machining piston only acts on the entity with piston crown like this, the piston remainder is not subjected to clamping force, eliminated the distortion that causes because of clamping force, and locating surface is in the top land outside, the processing smear metal of locating surface is easy to clean out, eliminated the position error that does not totally cause because of locating surface, made each form and position tolerance more stable.

The centre of gyration front end of anchor clamps of the present invention has a location shrinkage pool that matches with the piston positioning boss, and the outer ring is the protruding circle in location, and thimble is contained on the tailstock, reverses shrinkage pool on the anchor clamps.

Anchor clamps can be avoided all machined surfaces like this, make process tool can concentrate design at a cutter piece, can finish the processing of a plurality of machined surfaces in a clamping.

The piston processing technology of utilizing the method for positioning and clamping of piston and arranging has reduced the installation number of times than processing technology in the past, and it may further comprise the steps: 1) machining tool is provided; 2) provide process tool, anchor clamps; 3) outer face and the positioning boss with top land is locating surface, is clamping point with the top of piston cavity; ) 4 rough turn external diameters--thick, finish turning circular groove---finish turning external diameter; 5) heavy boring pin-and-hole--processing double sided button annular groove---precision bored hole; 6) lead plug oilhole; 7) jumping through rings oil-break hole; 8) fraising; 9) processing head.

--thick, finish turning circular groove---finish turning external diameter of finishing rough turn external diameter in a clamping has been eliminated twice clamping in the processing technology in the past and has been brought at the bottom of outside piston and the circular groove directly coaxiality error, improves the quality of products and productivity ratio.

--processing double sided button annular groove---precision bored hole of in a clamping, finishing the heavy boring pin-and-hole.Make pin-and-hole and retaining ring groove concentricity little, two retaining ring grooves make the retaining ring groove spacing stable with two two-sided processing of unit head, have eliminated position error.

The clamping force that the invention has the advantages that machining piston only acts on the entity with piston crown, the piston remainder is not subjected to clamping force, eliminated the distortion that clamping force causes, and locating surface is in the top land outside, and the processing smear metal of locating surface is easy to clean out, and has eliminated the position error that does not totally cause because of locating surface, make each form and position tolerance more stable, reduce clamping times, reduce the amount of labour, improve the quality of products and productivity ratio.

Description of drawings

Fig. 1 is existing piston processing and loading clamp schematic diagram

Fig. 2 is a piston processing and loading clamp schematic diagram of the present invention

Fig. 3 is a heavy boring pin-and-hole of the present invention--processing double sided button annular groove--the processing and loading clamp schematic diagram during-precision bored hole

Wherein: the outer face 14 at 12 positioning boss, 13 tops, top of 1 piston, 11 inner chambers is reversed upper surface outer ring, protruding 15 top 2 anchor clamps, 21 location shrinkage pool 22 thimbles 23 and is reversed protruding circle 4 cutters 5 tailstocks in shrinkage pool 24 location

The specific embodiment

Below in conjunction with view the utility model is described in detail

The method for positioning and clamping of piston processing is: 1) machining tool is provided; 2) provide process tool, anchor clamps 2; 3) top 11 with piston 1 inner chamber is a clamping point, is locating surface with the outer face 13 and the positioning boss 12 of top land.

The piston processing technology of utilizing the method for positioning and clamping of piston and arranging has reduced the installation number of times than processing technology in the past, and it may further comprise the steps: 1) machining tool is provided; 2) provide process tool, anchor clamps; 3) outer face and the positioning boss with top land is locating surface, is clamping point with the top of piston cavity, rough turn external diameter--thick, finish turning circular groove---finish turning external diameter; 4) being locating surface with top land upper surface outer ring 15 and positioning boss 12, is clamping point with the top 11 of piston cavity, 5) and heavy boring pin-and-hole--processing double sided button annular groove---precision bored hole; 6) lead plug oilhole; 7) jumping through rings oil-break hole; 8) fraising; 9) processing head.

As shown in Figure 2, the centre of gyration front end of anchor clamps 2 has a location shrinkage pool 21 that matches with piston positioning boss 12, and have with piston face reverse that projection 14 matches reverse shrinkage pool 23, the outer ring is the protruding circle 24 in location, thimble 22 is contained on the tailstock 5.On machining tool, use the positioning boss 12 of clamp clamps piston crown, withstand the top 11 of piston cavity with thimble 22, the rough turn piston external diameter of elder generation, 4 pairs of top land upper surfaces of dedicated tool outer ring 15 (as the locating surface of later processing), piston lower surface, circular groove are processed, again the fine finishining external diameter.

As shown in Figure 3, with top land upper surface outer ring 15 and positioning boss 12 is locating surface, top with piston cavity is a clamping point, finishes heavy boring pin-and-hole, processing double sided button annular groove in a clamping, utilizes slide unit that piston is delivered to the right boring main shaft to carry out precision bored hole.

Claims

1. the method for positioning and clamping of piston processing is characterized in that it may further comprise the steps:

1.1 machining tool is provided;

1.2 process tool (4), anchor clamps (2) are provided;

1.3 the top (11) with piston (1) inner chamber is a clamping point, is locating surface with the outer face (13) and the positioning boss (12) of top land;

1.4 the centre of gyration front end of anchor clamps (2) has a location shrinkage pool (21) that matches with piston positioning boss (12), the outer ring is location protruding circle (24), and thimble (22) is contained on the tailstock (5).

2. the method for positioning and clamping of piston processing according to claim 1 is characterized in that, reverses shrinkage pool (23) on the anchor clamps (2).

3. the method for positioning and clamping of piston according to claim 1 processing and the piston processing technology of arranging is characterized in that it may further comprise the steps:

3.1 machining tool is provided;

3.2 process tool, anchor clamps (2) are provided;

3.3 outer face (13) and positioning boss (12) with the pre-portion of piston are locating surface, are clamping point with the top (11) of piston cavity, rough turn external diameter--thick, finish turning circular groove---finish turning external diameter;

3.4 with top land upper surface outer ring (15) and positioning boss (12) is locating surface, is clamping point with the top (11) of piston cavity;

3.5 heavy boring pin-and-hole--processing double sided button annular groove---precision bored hole;

3.6 lead plug oilhole;

3.7 jumping through rings oil-break hole;

3.8 fraising;

3.9 processing head.