CN112091530B - Pin hole processing technology of melt pump shell - Google Patents
Pin hole processing technology of melt pump shell Download PDFInfo
- Publication number
- CN112091530B CN112091530B CN202010720796.3A CN202010720796A CN112091530B CN 112091530 B CN112091530 B CN 112091530B CN 202010720796 A CN202010720796 A CN 202010720796A CN 112091530 B CN112091530 B CN 112091530B
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- China
- Prior art keywords
- melt pump
- pin hole
- pump shell
- threaded hole
- gasket
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention belongs to the technical field of processing of melt pumps, and particularly relates to a pin hole processing technology of a melt pump shell. The method adopts the steps of firstly nitriding and then drilling the pin holes, so that the melt pump shell and the end cover do not have one-to-one matching characteristic before the pin holes are drilled, the production, the manufacture and the stock quantity are greatly improved, and the method has the characteristics of low processing cost and strong product adaptability.
Description
Technical Field
The invention belongs to the technical field of processing of melt pumps, and particularly relates to a pin hole processing technology of a melt pump shell.
Background
The melt gear pump is mainly used for conveying, pressurizing and metering high-temperature and high-viscosity polymer melts, the melt gear pump shell has higher requirements on wear resistance, hardness and corrosion resistance according to the processing environment, and in order to obtain the characteristics, nitriding treatment, namely a chemical heat treatment process for enabling nitrogen atoms to permeate into the surface layer of a workpiece in a medium with a certain temperature is often adopted.
The connection of a shell and an end cover of a melt pump needs to be positioned by pin holes, the pin holes are required to be formed frequently due to the requirement of high precision, the existing process is to form the shell and the end cover before nitriding the shell, and then to perform nitriding treatment after punching the positioning pin holes, so that the defect of poor precision and high rejection rate is overcome, the temperature in the operating process of the nitriding process can reach 500 ℃, a workpiece can be slightly deformed, the deformation has no influence under the condition of not harsh requirement, but has great influence on the high-precision workpiece, the rejection rate is increased, and the positioning pin holes between the melt pump shell and the end cover belong to the condition of high precision requirement. On the other hand, if the positioning pin hole is punched after the nitriding treatment, the hardness is too high, which causes a problem of high difficulty in punching.
Therefore, in order to obtain better wear resistance, surface hardness and corrosion resistance and facilitate the assembly of the melt pump shell and the end cover, a new processing technology needs to be developed.
Disclosure of Invention
The invention provides a pin hole processing technology of a melt pump shell, which aims to solve the problem that the prior art has contradiction between nitriding treatment and the pin hole processing technology when the melt pump shell is assembled with an end cover.
The invention relates to a pin hole processing technology of a melt pump shell, which adopts the following technical scheme:
a process for machining a pin hole in a melt pump housing, the process comprising the steps of:
s1, processing a threaded hole at the position of the melt pump shell where the pin hole needs to be processed, wherein the diameter of the threaded hole is smaller than the size of the needed pin hole;
s2, processing a spigot concave platform at the opening part of the threaded hole;
s3, placing a gasket with the size matched with that of the spigot concave table at the position of the spigot concave table, assembling a screw with the size matched with that of the spigot concave table in the threaded hole, and pressing the gasket on the melt pump shell by the screw to cover and seal the spigot concave table and the threaded hole;
s4, nitriding the melt pump shell assembled with the screw, wherein the temperature of the nitriding technological process is 490-510 ℃;
and S5, after the nitriding process is finished, removing the screws and the gaskets, positioning the melt pump shell and the end cover by adopting corresponding positioning tools, reaming the threaded hole, and drilling and reaming a required positioning pin hole.
Further, the gasket is a metal gasket, and the melting point of the gasket is higher than the temperature of the nitridation process.
Furthermore, the depth of the rabbet concave table is 0.5mm-3 mm.
Further, the diameter size of the needed positioning pin hole is 2mm-4mm larger than the diameter of the threaded hole.
The invention has the beneficial effects that:
according to the pin hole processing technology of the melt pump shell, the threaded hole and the rabbet concave platform are processed in advance at the position of the pin hole of the positioning pin, the position where the pin hole needs to be punched is covered and sealed and isolated through assembling the gasket and the screw, and the threaded hole is reamed after the nitriding treatment technology, so that the problems of deformation and dislocation caused by short time when the positioning pin hole is punched in advance are solved, and the problems that the surface hardness of a melt pump is high and the processing is difficult after the nitriding treatment are solved. The method adopts the steps of firstly nitriding and then drilling the pin holes, so that the melt pump shell and the end cover do not have one-to-one matching characteristic before the pin holes are drilled, the production, the manufacture and the stock quantity are greatly improved, and the method has the characteristics of low processing cost and strong product adaptability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic illustration of a prior art pin hole machining in a melt pump housing;
FIG. 2 is a schematic structural view of an embodiment of a pin hole machining process of a melt pump housing according to the present invention;
FIG. 3 is a schematic view of the assembly of the screw and the threaded hole of the pin hole processing technique of the melt pump housing according to the present invention;
reference numerals:
in fig. 1, 11: a melt pump housing; 12: an end cap; 13: and positioning the pin.
In fig. 2 and 3, 1: a melt pump housing; 2: a gasket; 3: a screw; 4: a spigot concave platform; 5: a threaded bore.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms than those herein described and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 shows a structure of the prior art, in which a very high positional accuracy is required when a melt pump housing 11 is coupled and matched with an end cover 12, and in the prior art, after being positioned by a corresponding tool, a pin hole is formed, and then the relative positional accuracy is ensured by coupling and positioning by a positioning pin 13.
Referring to fig. 2 and 3, an embodiment of a pin hole processing process of a melt pump housing according to the present invention is a pin hole processing process of a melt pump housing, the process including the following steps:
s1, processing a threaded hole 5 at a position where a pin hole needs to be processed on the melt pump shell 1, wherein the diameter size of the threaded hole 5 is smaller than the size of the needed pin hole;
s2, processing a spigot concave platform 4 at the opening part of the threaded hole 5;
s3, placing a gasket 2 with the size matched with the size of the spigot concave table 4 at the position of the spigot concave table 4, assembling a screw 3 with the size matched with the spigot concave table in the threaded hole 5, and pressing the gasket 2 on the melt pump shell 1 by the screw 3 to cover and seal and isolate the spigot concave table 4 and the threaded hole 5; specifically, the gasket 2 is made of a material with low hardness, and under the action of the fastening force of the screw 3, a gap can be eliminated, and a sealing effect is achieved.
S4, performing nitriding treatment on the melt pump shell 1 assembled with the screws 3, wherein the temperature of the nitriding technological process is 490-510 ℃, and the temperature of the nitriding technological process in the embodiment is 500 ℃;
and S5, after the nitriding process is completed, removing the screw 3 and the gasket 2, positioning the melt pump shell 1 and the end cover by adopting a corresponding positioning tool, reaming the threaded hole 5, and drilling and reaming a required positioning pin hole. Specifically, the fastening structure of the screw 3 and the gasket 2 completely covers, seals and isolates the position where the pin hole needs to be punched, and the surface of the position of the pin hole can be well protected from being nitrided by both a gas nitriding process and a liquid nitriding process, so that the position of the pin hole after nitriding still has hardness which is easy to process.
The gasket 2 is a metal gasket, and the melting point of the gasket 2 is higher than the temperature of the nitridation process.
The depth of the spigot concave 4 is 0.5mm-3mm, in this embodiment, the depth of the spigot concave 4 is 1 mm.
The diameter of the required locating pin hole is 2mm-4mm larger than the diameter of the threaded hole 5, specifically, if the diameter of the pin hole is phi 10, the threaded hole 5 of M8 or M6 is made as required.
It should be noted that in other embodiments of the invention, the depth of the seam allowance recess may be 2 mm.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A pin hole processing technology of a melt pump shell is characterized in that: the process comprises the following steps:
s1, processing a threaded hole at the position of the melt pump shell where the pin hole needs to be processed, wherein the diameter of the threaded hole is smaller than the size of the needed pin hole;
s2, processing a spigot concave platform at the opening part of the threaded hole;
s3, placing a gasket with the size matched with that of the spigot concave table at the position of the spigot concave table, assembling a screw with the size matched with that of the spigot concave table in the threaded hole, and pressing the gasket on the melt pump shell by the screw to cover and seal the spigot concave table and the threaded hole;
s4, nitriding the melt pump shell assembled with the screw, wherein the temperature of the nitriding technological process is 490-510 ℃;
and S5, after the nitriding process is finished, removing the screws and the gaskets, positioning the melt pump shell and the end cover by adopting corresponding positioning tools, reaming the threaded hole, and drilling and reaming a required positioning pin hole.
2. The process of claim 1 for pin hole machining of a melt pump housing, wherein: the gasket is a metal gasket, and the melting point of the gasket is higher than the temperature of the nitridation process.
3. The process of claim 1 for pin hole machining of a melt pump housing, wherein: the depth of the spigot concave table is 0.5mm-3 mm.
4. The process of claim 1 for pin hole machining of a melt pump housing, wherein: the diameter size of the needed positioning pin hole is 2mm-4mm larger than the diameter of the threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010720796.3A CN112091530B (en) | 2020-07-24 | 2020-07-24 | Pin hole processing technology of melt pump shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010720796.3A CN112091530B (en) | 2020-07-24 | 2020-07-24 | Pin hole processing technology of melt pump shell |
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| Publication Number | Publication Date |
|---|---|
| CN112091530A CN112091530A (en) | 2020-12-18 |
| CN112091530B true CN112091530B (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010720796.3A Active CN112091530B (en) | 2020-07-24 | 2020-07-24 | Pin hole processing technology of melt pump shell |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1468996A (en) * | 2003-06-10 | 2004-01-21 | 金学民 | Hydraulic needle plate and its manufacture process |
| CN105189922A (en) * | 2013-03-14 | 2015-12-23 | 默林科技股份有限公司 | Drill string inground isolator housing in an MWD system and method |
| CN106755910A (en) * | 2017-03-31 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method |
| CN206783723U (en) * | 2017-04-21 | 2017-12-22 | 兰州兰石重型装备股份有限公司 | Combined type double plate thread-locking ring exchanger heat handles anti-deformation device |
| CN109781937A (en) * | 2017-11-15 | 2019-05-21 | 罗伯特·博世有限公司 | The sealing element of sensor element for sensor and its manufacturing method |
| CN110777324A (en) * | 2020-01-02 | 2020-02-11 | 常州创思普特轨道交通科技有限公司 | Ionic nitriding process for parking brake ejector rod of railway vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012111890B3 (en) * | 2012-12-06 | 2013-12-24 | Thyssenkrupp Presta Aktiengesellschaft | Steering column for a motor vehicle |
-
2020
- 2020-07-24 CN CN202010720796.3A patent/CN112091530B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1468996A (en) * | 2003-06-10 | 2004-01-21 | 金学民 | Hydraulic needle plate and its manufacture process |
| CN105189922A (en) * | 2013-03-14 | 2015-12-23 | 默林科技股份有限公司 | Drill string inground isolator housing in an MWD system and method |
| CN106755910A (en) * | 2017-03-31 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method |
| CN206783723U (en) * | 2017-04-21 | 2017-12-22 | 兰州兰石重型装备股份有限公司 | Combined type double plate thread-locking ring exchanger heat handles anti-deformation device |
| CN109781937A (en) * | 2017-11-15 | 2019-05-21 | 罗伯特·博世有限公司 | The sealing element of sensor element for sensor and its manufacturing method |
| CN110777324A (en) * | 2020-01-02 | 2020-02-11 | 常州创思普特轨道交通科技有限公司 | Ionic nitriding process for parking brake ejector rod of railway vehicle |
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| CN112091530A (en) | 2020-12-18 |
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